diff --git a/public/modules/mediasoupclient.min.js b/public/modules/mediasoupclient.min.js
index d29d90a..7b8efd0 100644
--- a/public/modules/mediasoupclient.min.js
+++ b/public/modules/mediasoupclient.min.js
@@ -1,12395 +1,11332 @@
-(function () {
-    function r(e, n, t) {
-        function o(i, f) {
-            if (!n[i]) {
-                if (!e[i]) {
-                    var c = 'function' == typeof require && require;
-                    if (!f && c) return c(i, !0);
-                    if (u) return u(i, !0);
-                    var a = new Error("Cannot find module '" + i + "'");
-                    throw ((a.code = 'MODULE_NOT_FOUND'), a);
-                }
-                var p = (n[i] = { exports: {} });
-                e[i][0].call(
-                    p.exports,
-                    function (r) {
-                        var n = e[i][1][r];
-                        return o(n || r);
-                    },
-                    p,
-                    p.exports,
-                    r,
-                    e,
-                    n,
-                    t,
-                );
-            }
-            return n[i].exports;
+(function(){function r(e,n,t){function o(i,f){if(!n[i]){if(!e[i]){var c="function"==typeof require&&require;if(!f&&c)return c(i,!0);if(u)return u(i,!0);var a=new Error("Cannot find module '"+i+"'");throw a.code="MODULE_NOT_FOUND",a}var p=n[i]={exports:{}};e[i][0].call(p.exports,function(r){var n=e[i][1][r];return o(n||r)},p,p.exports,r,e,n,t)}return n[i].exports}for(var u="function"==typeof require&&require,i=0;i<t.length;i++)o(t[i]);return o}return r})()({1:[function(require,module,exports){
+const client = require('mediasoup-client')
+
+window.mediasoupClient = client
+},{"mediasoup-client":35}],2:[function(require,module,exports){
+"use strict";
+var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
+    function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
+    return new (P || (P = Promise))(function (resolve, reject) {
+        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
+        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
+        function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
+        step((generator = generator.apply(thisArg, _arguments || [])).next());
+    });
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+class AwaitQueue {
+    constructor({ ClosedErrorClass = Error, StoppedErrorClass = Error } = {
+        ClosedErrorClass: Error,
+        StoppedErrorClass: Error
+    }) {
+        // Closed flag.
+        this.closed = false;
+        // Queue of pending tasks.
+        this.pendingTasks = [];
+        // Error class used when rejecting a task due to AwaitQueue being closed.
+        this.ClosedErrorClass = Error;
+        // Error class used when rejecting a task due to AwaitQueue being stopped.
+        this.StoppedErrorClass = Error;
+        this.ClosedErrorClass = ClosedErrorClass;
+        this.StoppedErrorClass = StoppedErrorClass;
+    }
+    /**
+     * The number of ongoing enqueued tasks.
+     */
+    get size() {
+        return this.pendingTasks.length;
+    }
+    /**
+     * Closes the AwaitQueue. Pending tasks will be rejected with ClosedErrorClass
+     * error.
+     */
+    close() {
+        if (this.closed)
+            return;
+        this.closed = true;
+        for (const pendingTask of this.pendingTasks) {
+            pendingTask.stopped = true;
+            pendingTask.reject(new this.ClosedErrorClass('AwaitQueue closed'));
         }
-        for (var u = 'function' == typeof require && require, i = 0; i < t.length; i++) o(t[i]);
-        return o;
+        // Enpty the pending tasks array.
+        this.pendingTasks.length = 0;
     }
-    return r;
-})()(
-    {
-        1: [
-            function (require, module, exports) {
-                'use strict';
-                var __awaiter =
-                    (this && this.__awaiter) ||
-                    function (thisArg, _arguments, P, generator) {
-                        function adopt(value) {
-                            return value instanceof P
-                                ? value
-                                : new P(function (resolve) {
-                                      resolve(value);
-                                  });
-                        }
-                        return new (P || (P = Promise))(function (resolve, reject) {
-                            function fulfilled(value) {
-                                try {
-                                    step(generator.next(value));
-                                } catch (e) {
-                                    reject(e);
-                                }
-                            }
-                            function rejected(value) {
-                                try {
-                                    step(generator['throw'](value));
-                                } catch (e) {
-                                    reject(e);
-                                }
-                            }
-                            function step(result) {
-                                result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected);
-                            }
-                            step((generator = generator.apply(thisArg, _arguments || [])).next());
-                        });
-                    };
-                Object.defineProperty(exports, '__esModule', { value: true });
-                class AwaitQueue {
-                    constructor(
-                        { ClosedErrorClass, StoppedErrorClass } = {
-                            ClosedErrorClass: Error,
-                            StoppedErrorClass: Error,
-                        },
-                    ) {
-                        // Closed flag.
-                        this.closed = false;
-                        // Queue of pending tasks.
-                        this.pendingTasks = [];
-                        // Error class used when rejecting a task due to AwaitQueue being closed.
-                        this.ClosedErrorClass = Error;
-                        // Error class used when rejecting a task due to AwaitQueue being stopped.
-                        this.StoppedErrorClass = Error;
-                        this.ClosedErrorClass = ClosedErrorClass;
-                        this.StoppedErrorClass = StoppedErrorClass;
-                    }
-                    /**
-                     * The number of ongoing enqueued tasks.
-                     */
-                    get size() {
-                        return this.pendingTasks.length;
-                    }
-                    /**
-                     * Closes the AwaitQueue. Pending tasks will be rejected with ClosedErrorClass
-                     * error.
-                     */
-                    close() {
-                        if (this.closed) return;
-                        this.closed = true;
-                        for (const pendingTask of this.pendingTasks) {
-                            pendingTask.stopped = true;
-                            pendingTask.reject(new this.ClosedErrorClass('AwaitQueue closed'));
-                        }
-                        // Enpty the pending tasks array.
-                        this.pendingTasks.length = 0;
-                    }
-                    /**
-                     * Accepts a task as argument (and an optional task name) and enqueues it after
-                     * pending tasks. Once processed, the push() method resolves (or rejects) with
-                     * the result returned by the given task.
-                     *
-                     * The given task must return a Promise or directly a value.
-                     */
-                    push(task, name) {
-                        return __awaiter(this, void 0, void 0, function* () {
-                            if (this.closed) throw new this.ClosedErrorClass('AwaitQueue closed');
-                            if (typeof task !== 'function') throw new TypeError('given task is not a function');
-                            if (!task.name && name) {
-                                try {
-                                    Object.defineProperty(task, 'name', { value: name });
-                                } catch (error) {}
-                            }
-                            return new Promise((resolve, reject) => {
-                                const pendingTask = {
-                                    task,
-                                    name,
-                                    resolve,
-                                    reject,
-                                    stopped: false,
-                                };
-                                // Append task to the queue.
-                                this.pendingTasks.push(pendingTask);
-                                // And run it if this is the only task in the queue.
-                                if (this.pendingTasks.length === 1) this.next();
-                            });
-                        });
-                    }
-                    /**
-                     * Make ongoing pending tasks reject with the given StoppedErrorClass error.
-                     * The AwaitQueue instance is still usable for future tasks added via push()
-                     * method.
-                     */
-                    stop() {
-                        if (this.closed) return;
-                        for (const pendingTask of this.pendingTasks) {
-                            pendingTask.stopped = true;
-                            pendingTask.reject(new this.StoppedErrorClass('AwaitQueue stopped'));
-                        }
-                        // Enpty the pending tasks array.
-                        this.pendingTasks.length = 0;
-                    }
-                    dump() {
-                        return this.pendingTasks.map((pendingTask) => {
-                            return {
-                                task: pendingTask.task,
-                                name: pendingTask.name,
-                                stopped: pendingTask.stopped,
-                            };
-                        });
-                    }
-                    next() {
-                        return __awaiter(this, void 0, void 0, function* () {
-                            // Take the first pending task.
-                            const pendingTask = this.pendingTasks[0];
-                            if (!pendingTask) return;
-                            // Execute it.
-                            yield this.executeTask(pendingTask);
-                            // Remove the first pending task (the completed one) from the queue.
-                            this.pendingTasks.shift();
-                            // And continue.
-                            this.next();
-                        });
-                    }
-                    executeTask(pendingTask) {
-                        return __awaiter(this, void 0, void 0, function* () {
-                            // If the task is stopped, ignore it.
-                            if (pendingTask.stopped) return;
-                            try {
-                                const result = yield pendingTask.task();
-                                // If the task is stopped, ignore it.
-                                if (pendingTask.stopped) return;
-                                // Resolve the task with the returned result (if any).
-                                pendingTask.resolve(result);
-                            } catch (error) {
-                                // If the task is stopped, ignore it.
-                                if (pendingTask.stopped) return;
-                                // Reject the task with its own error.
-                                pendingTask.reject(error);
-                            }
-                        });
-                    }
-                }
-                exports.AwaitQueue = AwaitQueue;
-            },
-            {},
-        ],
-        2: [
-            function (require, module, exports) {
-                !(function (e, t) {
-                    'object' == typeof exports && 'object' == typeof module
-                        ? (module.exports = t())
-                        : 'function' == typeof define && define.amd
-                        ? define([], t)
-                        : 'object' == typeof exports
-                        ? (exports.bowser = t())
-                        : (e.bowser = t());
-                })(this, function () {
-                    return (function (e) {
-                        var t = {};
-                        function r(n) {
-                            if (t[n]) return t[n].exports;
-                            var i = (t[n] = { i: n, l: !1, exports: {} });
-                            return e[n].call(i.exports, i, i.exports, r), (i.l = !0), i.exports;
-                        }
-                        return (
-                            (r.m = e),
-                            (r.c = t),
-                            (r.d = function (e, t, n) {
-                                r.o(e, t) || Object.defineProperty(e, t, { enumerable: !0, get: n });
-                            }),
-                            (r.r = function (e) {
-                                'undefined' != typeof Symbol &&
-                                    Symbol.toStringTag &&
-                                    Object.defineProperty(e, Symbol.toStringTag, { value: 'Module' }),
-                                    Object.defineProperty(e, '__esModule', { value: !0 });
-                            }),
-                            (r.t = function (e, t) {
-                                if ((1 & t && (e = r(e)), 8 & t)) return e;
-                                if (4 & t && 'object' == typeof e && e && e.__esModule) return e;
-                                var n = Object.create(null);
-                                if (
-                                    (r.r(n),
-                                    Object.defineProperty(n, 'default', { enumerable: !0, value: e }),
-                                    2 & t && 'string' != typeof e)
-                                )
-                                    for (var i in e)
-                                        r.d(
-                                            n,
-                                            i,
-                                            function (t) {
-                                                return e[t];
-                                            }.bind(null, i),
-                                        );
-                                return n;
-                            }),
-                            (r.n = function (e) {
-                                var t =
-                                    e && e.__esModule
-                                        ? function () {
-                                              return e.default;
-                                          }
-                                        : function () {
-                                              return e;
-                                          };
-                                return r.d(t, 'a', t), t;
-                            }),
-                            (r.o = function (e, t) {
-                                return Object.prototype.hasOwnProperty.call(e, t);
-                            }),
-                            (r.p = ''),
-                            r((r.s = 90))
-                        );
-                    })({
-                        17: function (e, t, r) {
-                            'use strict';
-                            (t.__esModule = !0), (t.default = void 0);
-                            var n = r(18),
-                                i = (function () {
-                                    function e() {}
-                                    return (
-                                        (e.getFirstMatch = function (e, t) {
-                                            var r = t.match(e);
-                                            return (r && r.length > 0 && r[1]) || '';
-                                        }),
-                                        (e.getSecondMatch = function (e, t) {
-                                            var r = t.match(e);
-                                            return (r && r.length > 1 && r[2]) || '';
-                                        }),
-                                        (e.matchAndReturnConst = function (e, t, r) {
-                                            if (e.test(t)) return r;
-                                        }),
-                                        (e.getWindowsVersionName = function (e) {
-                                            switch (e) {
-                                                case 'NT':
-                                                    return 'NT';
-                                                case 'XP':
-                                                    return 'XP';
-                                                case 'NT 5.0':
-                                                    return '2000';
-                                                case 'NT 5.1':
-                                                    return 'XP';
-                                                case 'NT 5.2':
-                                                    return '2003';
-                                                case 'NT 6.0':
-                                                    return 'Vista';
-                                                case 'NT 6.1':
-                                                    return '7';
-                                                case 'NT 6.2':
-                                                    return '8';
-                                                case 'NT 6.3':
-                                                    return '8.1';
-                                                case 'NT 10.0':
-                                                    return '10';
-                                                default:
-                                                    return;
-                                            }
-                                        }),
-                                        (e.getMacOSVersionName = function (e) {
-                                            var t = e
-                                                .split('.')
-                                                .splice(0, 2)
-                                                .map(function (e) {
-                                                    return parseInt(e, 10) || 0;
-                                                });
-                                            if ((t.push(0), 10 === t[0]))
-                                                switch (t[1]) {
-                                                    case 5:
-                                                        return 'Leopard';
-                                                    case 6:
-                                                        return 'Snow Leopard';
-                                                    case 7:
-                                                        return 'Lion';
-                                                    case 8:
-                                                        return 'Mountain Lion';
-                                                    case 9:
-                                                        return 'Mavericks';
-                                                    case 10:
-                                                        return 'Yosemite';
-                                                    case 11:
-                                                        return 'El Capitan';
-                                                    case 12:
-                                                        return 'Sierra';
-                                                    case 13:
-                                                        return 'High Sierra';
-                                                    case 14:
-                                                        return 'Mojave';
-                                                    case 15:
-                                                        return 'Catalina';
-                                                    default:
-                                                        return;
-                                                }
-                                        }),
-                                        (e.getAndroidVersionName = function (e) {
-                                            var t = e
-                                                .split('.')
-                                                .splice(0, 2)
-                                                .map(function (e) {
-                                                    return parseInt(e, 10) || 0;
-                                                });
-                                            if ((t.push(0), !(1 === t[0] && t[1] < 5)))
-                                                return 1 === t[0] && t[1] < 6
-                                                    ? 'Cupcake'
-                                                    : 1 === t[0] && t[1] >= 6
-                                                    ? 'Donut'
-                                                    : 2 === t[0] && t[1] < 2
-                                                    ? 'Eclair'
-                                                    : 2 === t[0] && 2 === t[1]
-                                                    ? 'Froyo'
-                                                    : 2 === t[0] && t[1] > 2
-                                                    ? 'Gingerbread'
-                                                    : 3 === t[0]
-                                                    ? 'Honeycomb'
-                                                    : 4 === t[0] && t[1] < 1
-                                                    ? 'Ice Cream Sandwich'
-                                                    : 4 === t[0] && t[1] < 4
-                                                    ? 'Jelly Bean'
-                                                    : 4 === t[0] && t[1] >= 4
-                                                    ? 'KitKat'
-                                                    : 5 === t[0]
-                                                    ? 'Lollipop'
-                                                    : 6 === t[0]
-                                                    ? 'Marshmallow'
-                                                    : 7 === t[0]
-                                                    ? 'Nougat'
-                                                    : 8 === t[0]
-                                                    ? 'Oreo'
-                                                    : 9 === t[0]
-                                                    ? 'Pie'
-                                                    : void 0;
-                                        }),
-                                        (e.getVersionPrecision = function (e) {
-                                            return e.split('.').length;
-                                        }),
-                                        (e.compareVersions = function (t, r, n) {
-                                            void 0 === n && (n = !1);
-                                            var i = e.getVersionPrecision(t),
-                                                s = e.getVersionPrecision(r),
-                                                a = Math.max(i, s),
-                                                o = 0,
-                                                u = e.map([t, r], function (t) {
-                                                    var r = a - e.getVersionPrecision(t),
-                                                        n = t + new Array(r + 1).join('.0');
-                                                    return e
-                                                        .map(n.split('.'), function (e) {
-                                                            return new Array(20 - e.length).join('0') + e;
-                                                        })
-                                                        .reverse();
-                                                });
-                                            for (n && (o = a - Math.min(i, s)), a -= 1; a >= o; ) {
-                                                if (u[0][a] > u[1][a]) return 1;
-                                                if (u[0][a] === u[1][a]) {
-                                                    if (a === o) return 0;
-                                                    a -= 1;
-                                                } else if (u[0][a] < u[1][a]) return -1;
-                                            }
-                                        }),
-                                        (e.map = function (e, t) {
-                                            var r,
-                                                n = [];
-                                            if (Array.prototype.map) return Array.prototype.map.call(e, t);
-                                            for (r = 0; r < e.length; r += 1) n.push(t(e[r]));
-                                            return n;
-                                        }),
-                                        (e.find = function (e, t) {
-                                            var r, n;
-                                            if (Array.prototype.find) return Array.prototype.find.call(e, t);
-                                            for (r = 0, n = e.length; r < n; r += 1) {
-                                                var i = e[r];
-                                                if (t(i, r)) return i;
-                                            }
-                                        }),
-                                        (e.assign = function (e) {
-                                            for (
-                                                var t,
-                                                    r,
-                                                    n = e,
-                                                    i = arguments.length,
-                                                    s = new Array(i > 1 ? i - 1 : 0),
-                                                    a = 1;
-                                                a < i;
-                                                a++
-                                            )
-                                                s[a - 1] = arguments[a];
-                                            if (Object.assign) return Object.assign.apply(Object, [e].concat(s));
-                                            var o = function () {
-                                                var e = s[t];
-                                                'object' == typeof e &&
-                                                    null !== e &&
-                                                    Object.keys(e).forEach(function (t) {
-                                                        n[t] = e[t];
-                                                    });
-                                            };
-                                            for (t = 0, r = s.length; t < r; t += 1) o();
-                                            return e;
-                                        }),
-                                        (e.getBrowserAlias = function (e) {
-                                            return n.BROWSER_ALIASES_MAP[e];
-                                        }),
-                                        (e.getBrowserTypeByAlias = function (e) {
-                                            return n.BROWSER_MAP[e] || '';
-                                        }),
-                                        e
-                                    );
-                                })();
-                            (t.default = i), (e.exports = t.default);
-                        },
-                        18: function (e, t, r) {
-                            'use strict';
-                            (t.__esModule = !0),
-                                (t.ENGINE_MAP =
-                                    t.OS_MAP =
-                                    t.PLATFORMS_MAP =
-                                    t.BROWSER_MAP =
-                                    t.BROWSER_ALIASES_MAP =
-                                        void 0);
-                            t.BROWSER_ALIASES_MAP = {
-                                'Amazon Silk': 'amazon_silk',
-                                'Android Browser': 'android',
-                                Bada: 'bada',
-                                BlackBerry: 'blackberry',
-                                Chrome: 'chrome',
-                                Chromium: 'chromium',
-                                Electron: 'electron',
-                                Epiphany: 'epiphany',
-                                Firefox: 'firefox',
-                                Focus: 'focus',
-                                Generic: 'generic',
-                                'Google Search': 'google_search',
-                                Googlebot: 'googlebot',
-                                'Internet Explorer': 'ie',
-                                'K-Meleon': 'k_meleon',
-                                Maxthon: 'maxthon',
-                                'Microsoft Edge': 'edge',
-                                'MZ Browser': 'mz',
-                                'NAVER Whale Browser': 'naver',
-                                Opera: 'opera',
-                                'Opera Coast': 'opera_coast',
-                                PhantomJS: 'phantomjs',
-                                Puffin: 'puffin',
-                                QupZilla: 'qupzilla',
-                                QQ: 'qq',
-                                QQLite: 'qqlite',
-                                Safari: 'safari',
-                                Sailfish: 'sailfish',
-                                'Samsung Internet for Android': 'samsung_internet',
-                                SeaMonkey: 'seamonkey',
-                                Sleipnir: 'sleipnir',
-                                Swing: 'swing',
-                                Tizen: 'tizen',
-                                'UC Browser': 'uc',
-                                Vivaldi: 'vivaldi',
-                                'WebOS Browser': 'webos',
-                                WeChat: 'wechat',
-                                'Yandex Browser': 'yandex',
-                                Roku: 'roku',
-                            };
-                            t.BROWSER_MAP = {
-                                amazon_silk: 'Amazon Silk',
-                                android: 'Android Browser',
-                                bada: 'Bada',
-                                blackberry: 'BlackBerry',
-                                chrome: 'Chrome',
-                                chromium: 'Chromium',
-                                electron: 'Electron',
-                                epiphany: 'Epiphany',
-                                firefox: 'Firefox',
-                                focus: 'Focus',
-                                generic: 'Generic',
-                                googlebot: 'Googlebot',
-                                google_search: 'Google Search',
-                                ie: 'Internet Explorer',
-                                k_meleon: 'K-Meleon',
-                                maxthon: 'Maxthon',
-                                edge: 'Microsoft Edge',
-                                mz: 'MZ Browser',
-                                naver: 'NAVER Whale Browser',
-                                opera: 'Opera',
-                                opera_coast: 'Opera Coast',
-                                phantomjs: 'PhantomJS',
-                                puffin: 'Puffin',
-                                qupzilla: 'QupZilla',
-                                qq: 'QQ Browser',
-                                qqlite: 'QQ Browser Lite',
-                                safari: 'Safari',
-                                sailfish: 'Sailfish',
-                                samsung_internet: 'Samsung Internet for Android',
-                                seamonkey: 'SeaMonkey',
-                                sleipnir: 'Sleipnir',
-                                swing: 'Swing',
-                                tizen: 'Tizen',
-                                uc: 'UC Browser',
-                                vivaldi: 'Vivaldi',
-                                webos: 'WebOS Browser',
-                                wechat: 'WeChat',
-                                yandex: 'Yandex Browser',
-                            };
-                            t.PLATFORMS_MAP = { tablet: 'tablet', mobile: 'mobile', desktop: 'desktop', tv: 'tv' };
-                            t.OS_MAP = {
-                                WindowsPhone: 'Windows Phone',
-                                Windows: 'Windows',
-                                MacOS: 'macOS',
-                                iOS: 'iOS',
-                                Android: 'Android',
-                                WebOS: 'WebOS',
-                                BlackBerry: 'BlackBerry',
-                                Bada: 'Bada',
-                                Tizen: 'Tizen',
-                                Linux: 'Linux',
-                                ChromeOS: 'Chrome OS',
-                                PlayStation4: 'PlayStation 4',
-                                Roku: 'Roku',
-                            };
-                            t.ENGINE_MAP = {
-                                EdgeHTML: 'EdgeHTML',
-                                Blink: 'Blink',
-                                Trident: 'Trident',
-                                Presto: 'Presto',
-                                Gecko: 'Gecko',
-                                WebKit: 'WebKit',
-                            };
-                        },
-                        90: function (e, t, r) {
-                            'use strict';
-                            (t.__esModule = !0), (t.default = void 0);
-                            var n,
-                                i = (n = r(91)) && n.__esModule ? n : { default: n },
-                                s = r(18);
-                            function a(e, t) {
-                                for (var r = 0; r < t.length; r++) {
-                                    var n = t[r];
-                                    (n.enumerable = n.enumerable || !1),
-                                        (n.configurable = !0),
-                                        'value' in n && (n.writable = !0),
-                                        Object.defineProperty(e, n.key, n);
-                                }
-                            }
-                            var o = (function () {
-                                function e() {}
-                                var t, r, n;
-                                return (
-                                    (e.getParser = function (e, t) {
-                                        if ((void 0 === t && (t = !1), 'string' != typeof e))
-                                            throw new Error('UserAgent should be a string');
-                                        return new i.default(e, t);
-                                    }),
-                                    (e.parse = function (e) {
-                                        return new i.default(e).getResult();
-                                    }),
-                                    (t = e),
-                                    (n = [
-                                        {
-                                            key: 'BROWSER_MAP',
-                                            get: function () {
-                                                return s.BROWSER_MAP;
-                                            },
-                                        },
-                                        {
-                                            key: 'ENGINE_MAP',
-                                            get: function () {
-                                                return s.ENGINE_MAP;
-                                            },
-                                        },
-                                        {
-                                            key: 'OS_MAP',
-                                            get: function () {
-                                                return s.OS_MAP;
-                                            },
-                                        },
-                                        {
-                                            key: 'PLATFORMS_MAP',
-                                            get: function () {
-                                                return s.PLATFORMS_MAP;
-                                            },
-                                        },
-                                    ]),
-                                    (r = null) && a(t.prototype, r),
-                                    n && a(t, n),
-                                    e
-                                );
-                            })();
-                            (t.default = o), (e.exports = t.default);
-                        },
-                        91: function (e, t, r) {
-                            'use strict';
-                            (t.__esModule = !0), (t.default = void 0);
-                            var n = u(r(92)),
-                                i = u(r(93)),
-                                s = u(r(94)),
-                                a = u(r(95)),
-                                o = u(r(17));
-                            function u(e) {
-                                return e && e.__esModule ? e : { default: e };
-                            }
-                            var d = (function () {
-                                function e(e, t) {
-                                    if ((void 0 === t && (t = !1), null == e || '' === e))
-                                        throw new Error("UserAgent parameter can't be empty");
-                                    (this._ua = e), (this.parsedResult = {}), !0 !== t && this.parse();
-                                }
-                                var t = e.prototype;
-                                return (
-                                    (t.getUA = function () {
-                                        return this._ua;
-                                    }),
-                                    (t.test = function (e) {
-                                        return e.test(this._ua);
-                                    }),
-                                    (t.parseBrowser = function () {
-                                        var e = this;
-                                        this.parsedResult.browser = {};
-                                        var t = o.default.find(n.default, function (t) {
-                                            if ('function' == typeof t.test) return t.test(e);
-                                            if (t.test instanceof Array)
-                                                return t.test.some(function (t) {
-                                                    return e.test(t);
-                                                });
-                                            throw new Error("Browser's test function is not valid");
-                                        });
-                                        return (
-                                            t && (this.parsedResult.browser = t.describe(this.getUA())),
-                                            this.parsedResult.browser
-                                        );
-                                    }),
-                                    (t.getBrowser = function () {
-                                        return this.parsedResult.browser
-                                            ? this.parsedResult.browser
-                                            : this.parseBrowser();
-                                    }),
-                                    (t.getBrowserName = function (e) {
-                                        return e
-                                            ? String(this.getBrowser().name).toLowerCase() || ''
-                                            : this.getBrowser().name || '';
-                                    }),
-                                    (t.getBrowserVersion = function () {
-                                        return this.getBrowser().version;
-                                    }),
-                                    (t.getOS = function () {
-                                        return this.parsedResult.os ? this.parsedResult.os : this.parseOS();
-                                    }),
-                                    (t.parseOS = function () {
-                                        var e = this;
-                                        this.parsedResult.os = {};
-                                        var t = o.default.find(i.default, function (t) {
-                                            if ('function' == typeof t.test) return t.test(e);
-                                            if (t.test instanceof Array)
-                                                return t.test.some(function (t) {
-                                                    return e.test(t);
-                                                });
-                                            throw new Error("Browser's test function is not valid");
-                                        });
-                                        return (
-                                            t && (this.parsedResult.os = t.describe(this.getUA())), this.parsedResult.os
-                                        );
-                                    }),
-                                    (t.getOSName = function (e) {
-                                        var t = this.getOS().name;
-                                        return e ? String(t).toLowerCase() || '' : t || '';
-                                    }),
-                                    (t.getOSVersion = function () {
-                                        return this.getOS().version;
-                                    }),
-                                    (t.getPlatform = function () {
-                                        return this.parsedResult.platform
-                                            ? this.parsedResult.platform
-                                            : this.parsePlatform();
-                                    }),
-                                    (t.getPlatformType = function (e) {
-                                        void 0 === e && (e = !1);
-                                        var t = this.getPlatform().type;
-                                        return e ? String(t).toLowerCase() || '' : t || '';
-                                    }),
-                                    (t.parsePlatform = function () {
-                                        var e = this;
-                                        this.parsedResult.platform = {};
-                                        var t = o.default.find(s.default, function (t) {
-                                            if ('function' == typeof t.test) return t.test(e);
-                                            if (t.test instanceof Array)
-                                                return t.test.some(function (t) {
-                                                    return e.test(t);
-                                                });
-                                            throw new Error("Browser's test function is not valid");
-                                        });
-                                        return (
-                                            t && (this.parsedResult.platform = t.describe(this.getUA())),
-                                            this.parsedResult.platform
-                                        );
-                                    }),
-                                    (t.getEngine = function () {
-                                        return this.parsedResult.engine ? this.parsedResult.engine : this.parseEngine();
-                                    }),
-                                    (t.getEngineName = function (e) {
-                                        return e
-                                            ? String(this.getEngine().name).toLowerCase() || ''
-                                            : this.getEngine().name || '';
-                                    }),
-                                    (t.parseEngine = function () {
-                                        var e = this;
-                                        this.parsedResult.engine = {};
-                                        var t = o.default.find(a.default, function (t) {
-                                            if ('function' == typeof t.test) return t.test(e);
-                                            if (t.test instanceof Array)
-                                                return t.test.some(function (t) {
-                                                    return e.test(t);
-                                                });
-                                            throw new Error("Browser's test function is not valid");
-                                        });
-                                        return (
-                                            t && (this.parsedResult.engine = t.describe(this.getUA())),
-                                            this.parsedResult.engine
-                                        );
-                                    }),
-                                    (t.parse = function () {
-                                        return (
-                                            this.parseBrowser(),
-                                            this.parseOS(),
-                                            this.parsePlatform(),
-                                            this.parseEngine(),
-                                            this
-                                        );
-                                    }),
-                                    (t.getResult = function () {
-                                        return o.default.assign({}, this.parsedResult);
-                                    }),
-                                    (t.satisfies = function (e) {
-                                        var t = this,
-                                            r = {},
-                                            n = 0,
-                                            i = {},
-                                            s = 0;
-                                        if (
-                                            (Object.keys(e).forEach(function (t) {
-                                                var a = e[t];
-                                                'string' == typeof a
-                                                    ? ((i[t] = a), (s += 1))
-                                                    : 'object' == typeof a && ((r[t] = a), (n += 1));
-                                            }),
-                                            n > 0)
-                                        ) {
-                                            var a = Object.keys(r),
-                                                u = o.default.find(a, function (e) {
-                                                    return t.isOS(e);
-                                                });
-                                            if (u) {
-                                                var d = this.satisfies(r[u]);
-                                                if (void 0 !== d) return d;
-                                            }
-                                            var c = o.default.find(a, function (e) {
-                                                return t.isPlatform(e);
-                                            });
-                                            if (c) {
-                                                var f = this.satisfies(r[c]);
-                                                if (void 0 !== f) return f;
-                                            }
-                                        }
-                                        if (s > 0) {
-                                            var l = Object.keys(i),
-                                                h = o.default.find(l, function (e) {
-                                                    return t.isBrowser(e, !0);
-                                                });
-                                            if (void 0 !== h) return this.compareVersion(i[h]);
-                                        }
-                                    }),
-                                    (t.isBrowser = function (e, t) {
-                                        void 0 === t && (t = !1);
-                                        var r = this.getBrowserName().toLowerCase(),
-                                            n = e.toLowerCase(),
-                                            i = o.default.getBrowserTypeByAlias(n);
-                                        return t && i && (n = i.toLowerCase()), n === r;
-                                    }),
-                                    (t.compareVersion = function (e) {
-                                        var t = [0],
-                                            r = e,
-                                            n = !1,
-                                            i = this.getBrowserVersion();
-                                        if ('string' == typeof i)
-                                            return (
-                                                '>' === e[0] || '<' === e[0]
-                                                    ? ((r = e.substr(1)),
-                                                      '=' === e[1] ? ((n = !0), (r = e.substr(2))) : (t = []),
-                                                      '>' === e[0] ? t.push(1) : t.push(-1))
-                                                    : '=' === e[0]
-                                                    ? (r = e.substr(1))
-                                                    : '~' === e[0] && ((n = !0), (r = e.substr(1))),
-                                                t.indexOf(o.default.compareVersions(i, r, n)) > -1
-                                            );
-                                    }),
-                                    (t.isOS = function (e) {
-                                        return this.getOSName(!0) === String(e).toLowerCase();
-                                    }),
-                                    (t.isPlatform = function (e) {
-                                        return this.getPlatformType(!0) === String(e).toLowerCase();
-                                    }),
-                                    (t.isEngine = function (e) {
-                                        return this.getEngineName(!0) === String(e).toLowerCase();
-                                    }),
-                                    (t.is = function (e) {
-                                        return this.isBrowser(e) || this.isOS(e) || this.isPlatform(e);
-                                    }),
-                                    (t.some = function (e) {
-                                        var t = this;
-                                        return (
-                                            void 0 === e && (e = []),
-                                            e.some(function (e) {
-                                                return t.is(e);
-                                            })
-                                        );
-                                    }),
-                                    e
-                                );
-                            })();
-                            (t.default = d), (e.exports = t.default);
-                        },
-                        92: function (e, t, r) {
-                            'use strict';
-                            (t.__esModule = !0), (t.default = void 0);
-                            var n,
-                                i = (n = r(17)) && n.__esModule ? n : { default: n };
-                            var s = /version\/(\d+(\.?_?\d+)+)/i,
-                                a = [
-                                    {
-                                        test: [/googlebot/i],
-                                        describe: function (e) {
-                                            var t = { name: 'Googlebot' },
-                                                r =
-                                                    i.default.getFirstMatch(/googlebot\/(\d+(\.\d+))/i, e) ||
-                                                    i.default.getFirstMatch(s, e);
-                                            return r && (t.version = r), t;
-                                        },
-                                    },
-                                    {
-                                        test: [/opera/i],
-                                        describe: function (e) {
-                                            var t = { name: 'Opera' },
-                                                r =
-                                                    i.default.getFirstMatch(s, e) ||
-                                                    i.default.getFirstMatch(/(?:opera)[\s/](\d+(\.?_?\d+)+)/i, e);
-                                            return r && (t.version = r), t;
-                                        },
-                                    },
-                                    {
-                                        test: [/opr\/|opios/i],
-                                        describe: function (e) {
-                                            var t = { name: 'Opera' },
-                                                r =
-                                                    i.default.getFirstMatch(/(?:opr|opios)[\s/](\S+)/i, e) ||
-                                                    i.default.getFirstMatch(s, e);
-                                            return r && (t.version = r), t;
-                                        },
-                                    },
-                                    {
-                                        test: [/SamsungBrowser/i],
-                                        describe: function (e) {
-                                            var t = { name: 'Samsung Internet for Android' },
-                                                r =
-                                                    i.default.getFirstMatch(s, e) ||
-                                                    i.default.getFirstMatch(
-                                                        /(?:SamsungBrowser)[\s/](\d+(\.?_?\d+)+)/i,
-                                                        e,
-                                                    );
-                                            return r && (t.version = r), t;
-                                        },
-                                    },
-                                    {
-                                        test: [/Whale/i],
-                                        describe: function (e) {
-                                            var t = { name: 'NAVER Whale Browser' },
-                                                r =
-                                                    i.default.getFirstMatch(s, e) ||
-                                                    i.default.getFirstMatch(/(?:whale)[\s/](\d+(?:\.\d+)+)/i, e);
-                                            return r && (t.version = r), t;
-                                        },
-                                    },
-                                    {
-                                        test: [/MZBrowser/i],
-                                        describe: function (e) {
-                                            var t = { name: 'MZ Browser' },
-                                                r =
-                                                    i.default.getFirstMatch(/(?:MZBrowser)[\s/](\d+(?:\.\d+)+)/i, e) ||
-                                                    i.default.getFirstMatch(s, e);
-                                            return r && (t.version = r), t;
-                                        },
-                                    },
-                                    {
-                                        test: [/focus/i],
-                                        describe: function (e) {
-                                            var t = { name: 'Focus' },
-                                                r =
-                                                    i.default.getFirstMatch(/(?:focus)[\s/](\d+(?:\.\d+)+)/i, e) ||
-                                                    i.default.getFirstMatch(s, e);
-                                            return r && (t.version = r), t;
-                                        },
-                                    },
-                                    {
-                                        test: [/swing/i],
-                                        describe: function (e) {
-                                            var t = { name: 'Swing' },
-                                                r =
-                                                    i.default.getFirstMatch(/(?:swing)[\s/](\d+(?:\.\d+)+)/i, e) ||
-                                                    i.default.getFirstMatch(s, e);
-                                            return r && (t.version = r), t;
-                                        },
-                                    },
-                                    {
-                                        test: [/coast/i],
-                                        describe: function (e) {
-                                            var t = { name: 'Opera Coast' },
-                                                r =
-                                                    i.default.getFirstMatch(s, e) ||
-                                                    i.default.getFirstMatch(/(?:coast)[\s/](\d+(\.?_?\d+)+)/i, e);
-                                            return r && (t.version = r), t;
-                                        },
-                                    },
-                                    {
-                                        test: [/opt\/\d+(?:.?_?\d+)+/i],
-                                        describe: function (e) {
-                                            var t = { name: 'Opera Touch' },
-                                                r =
-                                                    i.default.getFirstMatch(/(?:opt)[\s/](\d+(\.?_?\d+)+)/i, e) ||
-                                                    i.default.getFirstMatch(s, e);
-                                            return r && (t.version = r), t;
-                                        },
-                                    },
-                                    {
-                                        test: [/yabrowser/i],
-                                        describe: function (e) {
-                                            var t = { name: 'Yandex Browser' },
-                                                r =
-                                                    i.default.getFirstMatch(/(?:yabrowser)[\s/](\d+(\.?_?\d+)+)/i, e) ||
-                                                    i.default.getFirstMatch(s, e);
-                                            return r && (t.version = r), t;
-                                        },
-                                    },
-                                    {
-                                        test: [/ucbrowser/i],
-                                        describe: function (e) {
-                                            var t = { name: 'UC Browser' },
-                                                r =
-                                                    i.default.getFirstMatch(s, e) ||
-                                                    i.default.getFirstMatch(/(?:ucbrowser)[\s/](\d+(\.?_?\d+)+)/i, e);
-                                            return r && (t.version = r), t;
-                                        },
-                                    },
-                                    {
-                                        test: [/Maxthon|mxios/i],
-                                        describe: function (e) {
-                                            var t = { name: 'Maxthon' },
-                                                r =
-                                                    i.default.getFirstMatch(s, e) ||
-                                                    i.default.getFirstMatch(
-                                                        /(?:Maxthon|mxios)[\s/](\d+(\.?_?\d+)+)/i,
-                                                        e,
-                                                    );
-                                            return r && (t.version = r), t;
-                                        },
-                                    },
-                                    {
-                                        test: [/epiphany/i],
-                                        describe: function (e) {
-                                            var t = { name: 'Epiphany' },
-                                                r =
-                                                    i.default.getFirstMatch(s, e) ||
-                                                    i.default.getFirstMatch(/(?:epiphany)[\s/](\d+(\.?_?\d+)+)/i, e);
-                                            return r && (t.version = r), t;
-                                        },
-                                    },
-                                    {
-                                        test: [/puffin/i],
-                                        describe: function (e) {
-                                            var t = { name: 'Puffin' },
-                                                r =
-                                                    i.default.getFirstMatch(s, e) ||
-                                                    i.default.getFirstMatch(/(?:puffin)[\s/](\d+(\.?_?\d+)+)/i, e);
-                                            return r && (t.version = r), t;
-                                        },
-                                    },
-                                    {
-                                        test: [/sleipnir/i],
-                                        describe: function (e) {
-                                            var t = { name: 'Sleipnir' },
-                                                r =
-                                                    i.default.getFirstMatch(s, e) ||
-                                                    i.default.getFirstMatch(/(?:sleipnir)[\s/](\d+(\.?_?\d+)+)/i, e);
-                                            return r && (t.version = r), t;
-                                        },
-                                    },
-                                    {
-                                        test: [/k-meleon/i],
-                                        describe: function (e) {
-                                            var t = { name: 'K-Meleon' },
-                                                r =
-                                                    i.default.getFirstMatch(s, e) ||
-                                                    i.default.getFirstMatch(/(?:k-meleon)[\s/](\d+(\.?_?\d+)+)/i, e);
-                                            return r && (t.version = r), t;
-                                        },
-                                    },
-                                    {
-                                        test: [/micromessenger/i],
-                                        describe: function (e) {
-                                            var t = { name: 'WeChat' },
-                                                r =
-                                                    i.default.getFirstMatch(
-                                                        /(?:micromessenger)[\s/](\d+(\.?_?\d+)+)/i,
-                                                        e,
-                                                    ) || i.default.getFirstMatch(s, e);
-                                            return r && (t.version = r), t;
-                                        },
-                                    },
-                                    {
-                                        test: [/qqbrowser/i],
-                                        describe: function (e) {
-                                            var t = {
-                                                    name: /qqbrowserlite/i.test(e) ? 'QQ Browser Lite' : 'QQ Browser',
-                                                },
-                                                r =
-                                                    i.default.getFirstMatch(
-                                                        /(?:qqbrowserlite|qqbrowser)[/](\d+(\.?_?\d+)+)/i,
-                                                        e,
-                                                    ) || i.default.getFirstMatch(s, e);
-                                            return r && (t.version = r), t;
-                                        },
-                                    },
-                                    {
-                                        test: [/msie|trident/i],
-                                        describe: function (e) {
-                                            var t = { name: 'Internet Explorer' },
-                                                r = i.default.getFirstMatch(/(?:msie |rv:)(\d+(\.?_?\d+)+)/i, e);
-                                            return r && (t.version = r), t;
-                                        },
-                                    },
-                                    {
-                                        test: [/\sedg\//i],
-                                        describe: function (e) {
-                                            var t = { name: 'Microsoft Edge' },
-                                                r = i.default.getFirstMatch(/\sedg\/(\d+(\.?_?\d+)+)/i, e);
-                                            return r && (t.version = r), t;
-                                        },
-                                    },
-                                    {
-                                        test: [/edg([ea]|ios)/i],
-                                        describe: function (e) {
-                                            var t = { name: 'Microsoft Edge' },
-                                                r = i.default.getSecondMatch(/edg([ea]|ios)\/(\d+(\.?_?\d+)+)/i, e);
-                                            return r && (t.version = r), t;
-                                        },
-                                    },
-                                    {
-                                        test: [/vivaldi/i],
-                                        describe: function (e) {
-                                            var t = { name: 'Vivaldi' },
-                                                r = i.default.getFirstMatch(/vivaldi\/(\d+(\.?_?\d+)+)/i, e);
-                                            return r && (t.version = r), t;
-                                        },
-                                    },
-                                    {
-                                        test: [/seamonkey/i],
-                                        describe: function (e) {
-                                            var t = { name: 'SeaMonkey' },
-                                                r = i.default.getFirstMatch(/seamonkey\/(\d+(\.?_?\d+)+)/i, e);
-                                            return r && (t.version = r), t;
-                                        },
-                                    },
-                                    {
-                                        test: [/sailfish/i],
-                                        describe: function (e) {
-                                            var t = { name: 'Sailfish' },
-                                                r = i.default.getFirstMatch(/sailfish\s?browser\/(\d+(\.\d+)?)/i, e);
-                                            return r && (t.version = r), t;
-                                        },
-                                    },
-                                    {
-                                        test: [/silk/i],
-                                        describe: function (e) {
-                                            var t = { name: 'Amazon Silk' },
-                                                r = i.default.getFirstMatch(/silk\/(\d+(\.?_?\d+)+)/i, e);
-                                            return r && (t.version = r), t;
-                                        },
-                                    },
-                                    {
-                                        test: [/phantom/i],
-                                        describe: function (e) {
-                                            var t = { name: 'PhantomJS' },
-                                                r = i.default.getFirstMatch(/phantomjs\/(\d+(\.?_?\d+)+)/i, e);
-                                            return r && (t.version = r), t;
-                                        },
-                                    },
-                                    {
-                                        test: [/slimerjs/i],
-                                        describe: function (e) {
-                                            var t = { name: 'SlimerJS' },
-                                                r = i.default.getFirstMatch(/slimerjs\/(\d+(\.?_?\d+)+)/i, e);
-                                            return r && (t.version = r), t;
-                                        },
-                                    },
-                                    {
-                                        test: [/blackberry|\bbb\d+/i, /rim\stablet/i],
-                                        describe: function (e) {
-                                            var t = { name: 'BlackBerry' },
-                                                r =
-                                                    i.default.getFirstMatch(s, e) ||
-                                                    i.default.getFirstMatch(/blackberry[\d]+\/(\d+(\.?_?\d+)+)/i, e);
-                                            return r && (t.version = r), t;
-                                        },
-                                    },
-                                    {
-                                        test: [/(web|hpw)[o0]s/i],
-                                        describe: function (e) {
-                                            var t = { name: 'WebOS Browser' },
-                                                r =
-                                                    i.default.getFirstMatch(s, e) ||
-                                                    i.default.getFirstMatch(
-                                                        /w(?:eb)?[o0]sbrowser\/(\d+(\.?_?\d+)+)/i,
-                                                        e,
-                                                    );
-                                            return r && (t.version = r), t;
-                                        },
-                                    },
-                                    {
-                                        test: [/bada/i],
-                                        describe: function (e) {
-                                            var t = { name: 'Bada' },
-                                                r = i.default.getFirstMatch(/dolfin\/(\d+(\.?_?\d+)+)/i, e);
-                                            return r && (t.version = r), t;
-                                        },
-                                    },
-                                    {
-                                        test: [/tizen/i],
-                                        describe: function (e) {
-                                            var t = { name: 'Tizen' },
-                                                r =
-                                                    i.default.getFirstMatch(
-                                                        /(?:tizen\s?)?browser\/(\d+(\.?_?\d+)+)/i,
-                                                        e,
-                                                    ) || i.default.getFirstMatch(s, e);
-                                            return r && (t.version = r), t;
-                                        },
-                                    },
-                                    {
-                                        test: [/qupzilla/i],
-                                        describe: function (e) {
-                                            var t = { name: 'QupZilla' },
-                                                r =
-                                                    i.default.getFirstMatch(/(?:qupzilla)[\s/](\d+(\.?_?\d+)+)/i, e) ||
-                                                    i.default.getFirstMatch(s, e);
-                                            return r && (t.version = r), t;
-                                        },
-                                    },
-                                    {
-                                        test: [/firefox|iceweasel|fxios/i],
-                                        describe: function (e) {
-                                            var t = { name: 'Firefox' },
-                                                r = i.default.getFirstMatch(
-                                                    /(?:firefox|iceweasel|fxios)[\s/](\d+(\.?_?\d+)+)/i,
-                                                    e,
-                                                );
-                                            return r && (t.version = r), t;
-                                        },
-                                    },
-                                    {
-                                        test: [/electron/i],
-                                        describe: function (e) {
-                                            var t = { name: 'Electron' },
-                                                r = i.default.getFirstMatch(/(?:electron)\/(\d+(\.?_?\d+)+)/i, e);
-                                            return r && (t.version = r), t;
-                                        },
-                                    },
-                                    {
-                                        test: [/chromium/i],
-                                        describe: function (e) {
-                                            var t = { name: 'Chromium' },
-                                                r =
-                                                    i.default.getFirstMatch(/(?:chromium)[\s/](\d+(\.?_?\d+)+)/i, e) ||
-                                                    i.default.getFirstMatch(s, e);
-                                            return r && (t.version = r), t;
-                                        },
-                                    },
-                                    {
-                                        test: [/chrome|crios|crmo/i],
-                                        describe: function (e) {
-                                            var t = { name: 'Chrome' },
-                                                r = i.default.getFirstMatch(
-                                                    /(?:chrome|crios|crmo)\/(\d+(\.?_?\d+)+)/i,
-                                                    e,
-                                                );
-                                            return r && (t.version = r), t;
-                                        },
-                                    },
-                                    {
-                                        test: [/GSA/i],
-                                        describe: function (e) {
-                                            var t = { name: 'Google Search' },
-                                                r = i.default.getFirstMatch(/(?:GSA)\/(\d+(\.?_?\d+)+)/i, e);
-                                            return r && (t.version = r), t;
-                                        },
-                                    },
-                                    {
-                                        test: function (e) {
-                                            var t = !e.test(/like android/i),
-                                                r = e.test(/android/i);
-                                            return t && r;
-                                        },
-                                        describe: function (e) {
-                                            var t = { name: 'Android Browser' },
-                                                r = i.default.getFirstMatch(s, e);
-                                            return r && (t.version = r), t;
-                                        },
-                                    },
-                                    {
-                                        test: [/playstation 4/i],
-                                        describe: function (e) {
-                                            var t = { name: 'PlayStation 4' },
-                                                r = i.default.getFirstMatch(s, e);
-                                            return r && (t.version = r), t;
-                                        },
-                                    },
-                                    {
-                                        test: [/safari|applewebkit/i],
-                                        describe: function (e) {
-                                            var t = { name: 'Safari' },
-                                                r = i.default.getFirstMatch(s, e);
-                                            return r && (t.version = r), t;
-                                        },
-                                    },
-                                    {
-                                        test: [/.*/i],
-                                        describe: function (e) {
-                                            var t = -1 !== e.search('\\(') ? /^(.*)\/(.*)[ \t]\((.*)/ : /^(.*)\/(.*) /;
-                                            return {
-                                                name: i.default.getFirstMatch(t, e),
-                                                version: i.default.getSecondMatch(t, e),
-                                            };
-                                        },
-                                    },
-                                ];
-                            (t.default = a), (e.exports = t.default);
-                        },
-                        93: function (e, t, r) {
-                            'use strict';
-                            (t.__esModule = !0), (t.default = void 0);
-                            var n,
-                                i = (n = r(17)) && n.__esModule ? n : { default: n },
-                                s = r(18);
-                            var a = [
-                                {
-                                    test: [/Roku\/DVP/],
-                                    describe: function (e) {
-                                        var t = i.default.getFirstMatch(/Roku\/DVP-(\d+\.\d+)/i, e);
-                                        return { name: s.OS_MAP.Roku, version: t };
-                                    },
-                                },
-                                {
-                                    test: [/windows phone/i],
-                                    describe: function (e) {
-                                        var t = i.default.getFirstMatch(/windows phone (?:os)?\s?(\d+(\.\d+)*)/i, e);
-                                        return { name: s.OS_MAP.WindowsPhone, version: t };
-                                    },
-                                },
-                                {
-                                    test: [/windows /i],
-                                    describe: function (e) {
-                                        var t = i.default.getFirstMatch(/Windows ((NT|XP)( \d\d?.\d)?)/i, e),
-                                            r = i.default.getWindowsVersionName(t);
-                                        return { name: s.OS_MAP.Windows, version: t, versionName: r };
-                                    },
-                                },
-                                {
-                                    test: [/Macintosh(.*?) FxiOS(.*?)\//],
-                                    describe: function (e) {
-                                        var t = { name: s.OS_MAP.iOS },
-                                            r = i.default.getSecondMatch(/(Version\/)(\d[\d.]+)/, e);
-                                        return r && (t.version = r), t;
-                                    },
-                                },
-                                {
-                                    test: [/macintosh/i],
-                                    describe: function (e) {
-                                        var t = i.default
-                                                .getFirstMatch(/mac os x (\d+(\.?_?\d+)+)/i, e)
-                                                .replace(/[_\s]/g, '.'),
-                                            r = i.default.getMacOSVersionName(t),
-                                            n = { name: s.OS_MAP.MacOS, version: t };
-                                        return r && (n.versionName = r), n;
-                                    },
-                                },
-                                {
-                                    test: [/(ipod|iphone|ipad)/i],
-                                    describe: function (e) {
-                                        var t = i.default
-                                            .getFirstMatch(/os (\d+([_\s]\d+)*) like mac os x/i, e)
-                                            .replace(/[_\s]/g, '.');
-                                        return { name: s.OS_MAP.iOS, version: t };
-                                    },
-                                },
-                                {
-                                    test: function (e) {
-                                        var t = !e.test(/like android/i),
-                                            r = e.test(/android/i);
-                                        return t && r;
-                                    },
-                                    describe: function (e) {
-                                        var t = i.default.getFirstMatch(/android[\s/-](\d+(\.\d+)*)/i, e),
-                                            r = i.default.getAndroidVersionName(t),
-                                            n = { name: s.OS_MAP.Android, version: t };
-                                        return r && (n.versionName = r), n;
-                                    },
-                                },
-                                {
-                                    test: [/(web|hpw)[o0]s/i],
-                                    describe: function (e) {
-                                        var t = i.default.getFirstMatch(/(?:web|hpw)[o0]s\/(\d+(\.\d+)*)/i, e),
-                                            r = { name: s.OS_MAP.WebOS };
-                                        return t && t.length && (r.version = t), r;
-                                    },
-                                },
-                                {
-                                    test: [/blackberry|\bbb\d+/i, /rim\stablet/i],
-                                    describe: function (e) {
-                                        var t =
-                                            i.default.getFirstMatch(/rim\stablet\sos\s(\d+(\.\d+)*)/i, e) ||
-                                            i.default.getFirstMatch(/blackberry\d+\/(\d+([_\s]\d+)*)/i, e) ||
-                                            i.default.getFirstMatch(/\bbb(\d+)/i, e);
-                                        return { name: s.OS_MAP.BlackBerry, version: t };
-                                    },
-                                },
-                                {
-                                    test: [/bada/i],
-                                    describe: function (e) {
-                                        var t = i.default.getFirstMatch(/bada\/(\d+(\.\d+)*)/i, e);
-                                        return { name: s.OS_MAP.Bada, version: t };
-                                    },
-                                },
-                                {
-                                    test: [/tizen/i],
-                                    describe: function (e) {
-                                        var t = i.default.getFirstMatch(/tizen[/\s](\d+(\.\d+)*)/i, e);
-                                        return { name: s.OS_MAP.Tizen, version: t };
-                                    },
-                                },
-                                {
-                                    test: [/linux/i],
-                                    describe: function () {
-                                        return { name: s.OS_MAP.Linux };
-                                    },
-                                },
-                                {
-                                    test: [/CrOS/],
-                                    describe: function () {
-                                        return { name: s.OS_MAP.ChromeOS };
-                                    },
-                                },
-                                {
-                                    test: [/PlayStation 4/],
-                                    describe: function (e) {
-                                        var t = i.default.getFirstMatch(/PlayStation 4[/\s](\d+(\.\d+)*)/i, e);
-                                        return { name: s.OS_MAP.PlayStation4, version: t };
-                                    },
-                                },
-                            ];
-                            (t.default = a), (e.exports = t.default);
-                        },
-                        94: function (e, t, r) {
-                            'use strict';
-                            (t.__esModule = !0), (t.default = void 0);
-                            var n,
-                                i = (n = r(17)) && n.__esModule ? n : { default: n },
-                                s = r(18);
-                            var a = [
-                                {
-                                    test: [/googlebot/i],
-                                    describe: function () {
-                                        return { type: 'bot', vendor: 'Google' };
-                                    },
-                                },
-                                {
-                                    test: [/huawei/i],
-                                    describe: function (e) {
-                                        var t = i.default.getFirstMatch(/(can-l01)/i, e) && 'Nova',
-                                            r = { type: s.PLATFORMS_MAP.mobile, vendor: 'Huawei' };
-                                        return t && (r.model = t), r;
-                                    },
-                                },
-                                {
-                                    test: [/nexus\s*(?:7|8|9|10).*/i],
-                                    describe: function () {
-                                        return { type: s.PLATFORMS_MAP.tablet, vendor: 'Nexus' };
-                                    },
-                                },
-                                {
-                                    test: [/ipad/i],
-                                    describe: function () {
-                                        return { type: s.PLATFORMS_MAP.tablet, vendor: 'Apple', model: 'iPad' };
-                                    },
-                                },
-                                {
-                                    test: [/Macintosh(.*?) FxiOS(.*?)\//],
-                                    describe: function () {
-                                        return { type: s.PLATFORMS_MAP.tablet, vendor: 'Apple', model: 'iPad' };
-                                    },
-                                },
-                                {
-                                    test: [/kftt build/i],
-                                    describe: function () {
-                                        return {
-                                            type: s.PLATFORMS_MAP.tablet,
-                                            vendor: 'Amazon',
-                                            model: 'Kindle Fire HD 7',
-                                        };
-                                    },
-                                },
-                                {
-                                    test: [/silk/i],
-                                    describe: function () {
-                                        return { type: s.PLATFORMS_MAP.tablet, vendor: 'Amazon' };
-                                    },
-                                },
-                                {
-                                    test: [/tablet(?! pc)/i],
-                                    describe: function () {
-                                        return { type: s.PLATFORMS_MAP.tablet };
-                                    },
-                                },
-                                {
-                                    test: function (e) {
-                                        var t = e.test(/ipod|iphone/i),
-                                            r = e.test(/like (ipod|iphone)/i);
-                                        return t && !r;
-                                    },
-                                    describe: function (e) {
-                                        var t = i.default.getFirstMatch(/(ipod|iphone)/i, e);
-                                        return { type: s.PLATFORMS_MAP.mobile, vendor: 'Apple', model: t };
-                                    },
-                                },
-                                {
-                                    test: [/nexus\s*[0-6].*/i, /galaxy nexus/i],
-                                    describe: function () {
-                                        return { type: s.PLATFORMS_MAP.mobile, vendor: 'Nexus' };
-                                    },
-                                },
-                                {
-                                    test: [/[^-]mobi/i],
-                                    describe: function () {
-                                        return { type: s.PLATFORMS_MAP.mobile };
-                                    },
-                                },
-                                {
-                                    test: function (e) {
-                                        return 'blackberry' === e.getBrowserName(!0);
-                                    },
-                                    describe: function () {
-                                        return { type: s.PLATFORMS_MAP.mobile, vendor: 'BlackBerry' };
-                                    },
-                                },
-                                {
-                                    test: function (e) {
-                                        return 'bada' === e.getBrowserName(!0);
-                                    },
-                                    describe: function () {
-                                        return { type: s.PLATFORMS_MAP.mobile };
-                                    },
-                                },
-                                {
-                                    test: function (e) {
-                                        return 'windows phone' === e.getBrowserName();
-                                    },
-                                    describe: function () {
-                                        return { type: s.PLATFORMS_MAP.mobile, vendor: 'Microsoft' };
-                                    },
-                                },
-                                {
-                                    test: function (e) {
-                                        var t = Number(String(e.getOSVersion()).split('.')[0]);
-                                        return 'android' === e.getOSName(!0) && t >= 3;
-                                    },
-                                    describe: function () {
-                                        return { type: s.PLATFORMS_MAP.tablet };
-                                    },
-                                },
-                                {
-                                    test: function (e) {
-                                        return 'android' === e.getOSName(!0);
-                                    },
-                                    describe: function () {
-                                        return { type: s.PLATFORMS_MAP.mobile };
-                                    },
-                                },
-                                {
-                                    test: function (e) {
-                                        return 'macos' === e.getOSName(!0);
-                                    },
-                                    describe: function () {
-                                        return { type: s.PLATFORMS_MAP.desktop, vendor: 'Apple' };
-                                    },
-                                },
-                                {
-                                    test: function (e) {
-                                        return 'windows' === e.getOSName(!0);
-                                    },
-                                    describe: function () {
-                                        return { type: s.PLATFORMS_MAP.desktop };
-                                    },
-                                },
-                                {
-                                    test: function (e) {
-                                        return 'linux' === e.getOSName(!0);
-                                    },
-                                    describe: function () {
-                                        return { type: s.PLATFORMS_MAP.desktop };
-                                    },
-                                },
-                                {
-                                    test: function (e) {
-                                        return 'playstation 4' === e.getOSName(!0);
-                                    },
-                                    describe: function () {
-                                        return { type: s.PLATFORMS_MAP.tv };
-                                    },
-                                },
-                                {
-                                    test: function (e) {
-                                        return 'roku' === e.getOSName(!0);
-                                    },
-                                    describe: function () {
-                                        return { type: s.PLATFORMS_MAP.tv };
-                                    },
-                                },
-                            ];
-                            (t.default = a), (e.exports = t.default);
-                        },
-                        95: function (e, t, r) {
-                            'use strict';
-                            (t.__esModule = !0), (t.default = void 0);
-                            var n,
-                                i = (n = r(17)) && n.__esModule ? n : { default: n },
-                                s = r(18);
-                            var a = [
-                                {
-                                    test: function (e) {
-                                        return 'microsoft edge' === e.getBrowserName(!0);
-                                    },
-                                    describe: function (e) {
-                                        if (/\sedg\//i.test(e)) return { name: s.ENGINE_MAP.Blink };
-                                        var t = i.default.getFirstMatch(/edge\/(\d+(\.?_?\d+)+)/i, e);
-                                        return { name: s.ENGINE_MAP.EdgeHTML, version: t };
-                                    },
-                                },
-                                {
-                                    test: [/trident/i],
-                                    describe: function (e) {
-                                        var t = { name: s.ENGINE_MAP.Trident },
-                                            r = i.default.getFirstMatch(/trident\/(\d+(\.?_?\d+)+)/i, e);
-                                        return r && (t.version = r), t;
-                                    },
-                                },
-                                {
-                                    test: function (e) {
-                                        return e.test(/presto/i);
-                                    },
-                                    describe: function (e) {
-                                        var t = { name: s.ENGINE_MAP.Presto },
-                                            r = i.default.getFirstMatch(/presto\/(\d+(\.?_?\d+)+)/i, e);
-                                        return r && (t.version = r), t;
-                                    },
-                                },
-                                {
-                                    test: function (e) {
-                                        var t = e.test(/gecko/i),
-                                            r = e.test(/like gecko/i);
-                                        return t && !r;
-                                    },
-                                    describe: function (e) {
-                                        var t = { name: s.ENGINE_MAP.Gecko },
-                                            r = i.default.getFirstMatch(/gecko\/(\d+(\.?_?\d+)+)/i, e);
-                                        return r && (t.version = r), t;
-                                    },
-                                },
-                                {
-                                    test: [/(apple)?webkit\/537\.36/i],
-                                    describe: function () {
-                                        return { name: s.ENGINE_MAP.Blink };
-                                    },
-                                },
-                                {
-                                    test: [/(apple)?webkit/i],
-                                    describe: function (e) {
-                                        var t = { name: s.ENGINE_MAP.WebKit },
-                                            r = i.default.getFirstMatch(/webkit\/(\d+(\.?_?\d+)+)/i, e);
-                                        return r && (t.version = r), t;
-                                    },
-                                },
-                            ];
-                            (t.default = a), (e.exports = t.default);
-                        },
-                    });
-                });
-            },
-            {},
-        ],
-        3: [
-            function (require, module, exports) {
-                const debug = require('debug')('h264-profile-level-id');
-
-                /* eslint-disable no-console */
-                debug.log = console.info.bind(console);
-                /* eslint-enable no-console */
-
-                const ProfileConstrainedBaseline = 1;
-                const ProfileBaseline = 2;
-                const ProfileMain = 3;
-                const ProfileConstrainedHigh = 4;
-                const ProfileHigh = 5;
-
-                exports.ProfileConstrainedBaseline = ProfileConstrainedBaseline;
-                exports.ProfileBaseline = ProfileBaseline;
-                exports.ProfileMain = ProfileMain;
-                exports.ProfileConstrainedHigh = ProfileConstrainedHigh;
-                exports.ProfileHigh = ProfileHigh;
-
-                // All values are equal to ten times the level number, except level 1b which is
-                // special.
-                const Level1_b = 0;
-                const Level1 = 10;
-                const Level1_1 = 11;
-                const Level1_2 = 12;
-                const Level1_3 = 13;
-                const Level2 = 20;
-                const Level2_1 = 21;
-                const Level2_2 = 22;
-                const Level3 = 30;
-                const Level3_1 = 31;
-                const Level3_2 = 32;
-                const Level4 = 40;
-                const Level4_1 = 41;
-                const Level4_2 = 42;
-                const Level5 = 50;
-                const Level5_1 = 51;
-                const Level5_2 = 52;
-
-                exports.Level1_b = Level1_b;
-                exports.Level1 = Level1;
-                exports.Level1_1 = Level1_1;
-                exports.Level1_2 = Level1_2;
-                exports.Level1_3 = Level1_3;
-                exports.Level2 = Level2;
-                exports.Level2_1 = Level2_1;
-                exports.Level2_2 = Level2_2;
-                exports.Level3 = Level3;
-                exports.Level3_1 = Level3_1;
-                exports.Level3_2 = Level3_2;
-                exports.Level4 = Level4;
-                exports.Level4_1 = Level4_1;
-                exports.Level4_2 = Level4_2;
-                exports.Level5 = Level5;
-                exports.Level5_1 = Level5_1;
-                exports.Level5_2 = Level5_2;
-
-                class ProfileLevelId {
-                    constructor(profile, level) {
-                        this.profile = profile;
-                        this.level = level;
-                    }
-                }
-
-                exports.ProfileLevelId = ProfileLevelId;
-
-                // Default ProfileLevelId.
-                //
-                // TODO: The default should really be profile Baseline and level 1 according to
-                // the spec: https://tools.ietf.org/html/rfc6184#section-8.1. In order to not
-                // break backwards compatibility with older versions of WebRTC where external
-                // codecs don't have any parameters, use profile ConstrainedBaseline level 3_1
-                // instead. This workaround will only be done in an interim period to allow
-                // external clients to update their code.
-                //
-                // http://crbug/webrtc/6337.
-                const DefaultProfileLevelId = new ProfileLevelId(ProfileConstrainedBaseline, Level3_1);
-
-                // For level_idc=11 and profile_idc=0x42, 0x4D, or 0x58, the constraint set3
-                // flag specifies if level 1b or level 1.1 is used.
-                const ConstraintSet3Flag = 0x10;
-
-                // Class for matching bit patterns such as "x1xx0000" where 'x' is allowed to be
-                // either 0 or 1.
-                class BitPattern {
-                    constructor(str) {
-                        this._mask = ~byteMaskString('x', str);
-                        this._maskedValue = byteMaskString('1', str);
-                    }
-
-                    isMatch(value) {
-                        return this._maskedValue === (value & this._mask);
-                    }
-                }
-
-                // Class for converting between profile_idc/profile_iop to Profile.
-                class ProfilePattern {
-                    constructor(profile_idc, profile_iop, profile) {
-                        this.profile_idc = profile_idc;
-                        this.profile_iop = profile_iop;
-                        this.profile = profile;
-                    }
+    /**
+     * Accepts a task as argument (and an optional task name) and enqueues it after
+     * pending tasks. Once processed, the push() method resolves (or rejects) with
+     * the result returned by the given task.
+     *
+     * The given task must return a Promise or directly a value.
+     */
+    push(task, name) {
+        return __awaiter(this, void 0, void 0, function* () {
+            if (this.closed)
+                throw new this.ClosedErrorClass('AwaitQueue closed');
+            if (typeof task !== 'function')
+                throw new TypeError('given task is not a function');
+            if (!task.name && name) {
+                try {
+                    Object.defineProperty(task, 'name', { value: name });
                 }
-
-                // This is from https://tools.ietf.org/html/rfc6184#section-8.1.
-                const ProfilePatterns = [
-                    new ProfilePattern(0x42, new BitPattern('x1xx0000'), ProfileConstrainedBaseline),
-                    new ProfilePattern(0x4d, new BitPattern('1xxx0000'), ProfileConstrainedBaseline),
-                    new ProfilePattern(0x58, new BitPattern('11xx0000'), ProfileConstrainedBaseline),
-                    new ProfilePattern(0x42, new BitPattern('x0xx0000'), ProfileBaseline),
-                    new ProfilePattern(0x58, new BitPattern('10xx0000'), ProfileBaseline),
-                    new ProfilePattern(0x4d, new BitPattern('0x0x0000'), ProfileMain),
-                    new ProfilePattern(0x64, new BitPattern('00000000'), ProfileHigh),
-                    new ProfilePattern(0x64, new BitPattern('00001100'), ProfileConstrainedHigh),
-                ];
-
-                /**
-                 * Parse profile level id that is represented as a string of 3 hex bytes.
-                 * Nothing will be returned if the string is not a recognized H264 profile
-                 * level id.
-                 *
-                 * @param {String} str - profile-level-id value as a string of 3 hex bytes.
-                 *
-                 * @returns {ProfileLevelId}
-                 */
-                exports.parseProfileLevelId = function (str) {
-                    // The string should consist of 3 bytes in hexadecimal format.
-                    if (typeof str !== 'string' || str.length !== 6) return null;
-
-                    const profile_level_id_numeric = parseInt(str, 16);
-
-                    if (profile_level_id_numeric === 0) return null;
-
-                    // Separate into three bytes.
-                    const level_idc = profile_level_id_numeric & 0xff;
-                    const profile_iop = (profile_level_id_numeric >> 8) & 0xff;
-                    const profile_idc = (profile_level_id_numeric >> 16) & 0xff;
-
-                    // Parse level based on level_idc and constraint set 3 flag.
-                    let level;
-
-                    switch (level_idc) {
-                        case Level1_1: {
-                            level = (profile_iop & ConstraintSet3Flag) !== 0 ? Level1_b : Level1_1;
-                            break;
-                        }
-                        case Level1:
-                        case Level1_2:
-                        case Level1_3:
-                        case Level2:
-                        case Level2_1:
-                        case Level2_2:
-                        case Level3:
-                        case Level3_1:
-                        case Level3_2:
-                        case Level4:
-                        case Level4_1:
-                        case Level4_2:
-                        case Level5:
-                        case Level5_1:
-                        case Level5_2: {
-                            level = level_idc;
-                            break;
-                        }
-                        // Unrecognized level_idc.
-                        default: {
-                            debug('parseProfileLevelId() | unrecognized level_idc:%s', level_idc);
-
-                            return null;
-                        }
-                    }
-
-                    // Parse profile_idc/profile_iop into a Profile enum.
-                    for (const pattern of ProfilePatterns) {
-                        if (profile_idc === pattern.profile_idc && pattern.profile_iop.isMatch(profile_iop)) {
-                            return new ProfileLevelId(pattern.profile, level);
-                        }
-                    }
-
-                    debug('parseProfileLevelId() | unrecognized profile_idc/profile_iop combination');
-
-                    return null;
-                };
-
-                /**
-                 * Returns canonical string representation as three hex bytes of the profile
-                 * level id, or returns nothing for invalid profile level ids.
-                 *
-                 * @param {ProfileLevelId} profile_level_id
-                 *
-                 * @returns {String}
-                 */
-                exports.profileLevelIdToString = function (profile_level_id) {
-                    // Handle special case level == 1b.
-                    if (profile_level_id.level == Level1_b) {
-                        switch (profile_level_id.profile) {
-                            case ProfileConstrainedBaseline: {
-                                return '42f00b';
-                            }
-                            case ProfileBaseline: {
-                                return '42100b';
-                            }
-                            case ProfileMain: {
-                                return '4d100b';
-                            }
-                            // Level 1_b is not allowed for other profiles.
-                            default: {
-                                debug(
-                                    'profileLevelIdToString() | Level 1_b not is allowed for profile:%s',
-                                    profile_level_id.profile,
-                                );
-
-                                return null;
-                            }
-                        }
-                    }
-
-                    let profile_idc_iop_string;
-
-                    switch (profile_level_id.profile) {
-                        case ProfileConstrainedBaseline: {
-                            profile_idc_iop_string = '42e0';
-                            break;
-                        }
-                        case ProfileBaseline: {
-                            profile_idc_iop_string = '4200';
-                            break;
-                        }
-                        case ProfileMain: {
-                            profile_idc_iop_string = '4d00';
-                            break;
-                        }
-                        case ProfileConstrainedHigh: {
-                            profile_idc_iop_string = '640c';
-                            break;
-                        }
-                        case ProfileHigh: {
-                            profile_idc_iop_string = '6400';
-                            break;
-                        }
-                        default: {
-                            debug('profileLevelIdToString() | unrecognized profile:%s', profile_level_id.profile);
-
-                            return null;
-                        }
-                    }
-
-                    let levelStr = profile_level_id.level.toString(16);
-
-                    if (levelStr.length === 1) levelStr = `0${levelStr}`;
-
-                    return `${profile_idc_iop_string}${levelStr}`;
-                };
-
-                /**
-                 * Parse profile level id that is represented as a string of 3 hex bytes
-                 * contained in an SDP key-value map. A default profile level id will be
-                 * returned if the profile-level-id key is missing. Nothing will be returned if
-                 * the key is present but the string is invalid.
-                 *
-                 * @param {Object} [params={}] - Codec parameters object.
-                 *
-                 * @returns {ProfileLevelId}
-                 */
-                exports.parseSdpProfileLevelId = function (params = {}) {
-                    const profile_level_id = params['profile-level-id'];
-
-                    return !profile_level_id ? DefaultProfileLevelId : exports.parseProfileLevelId(profile_level_id);
-                };
-
-                /**
-                 * Returns true if the parameters have the same H264 profile, i.e. the same
-                 * H264 profile (Baseline, High, etc).
-                 *
-                 * @param {Object} [params1={}] - Codec parameters object.
-                 * @param {Object} [params2={}] - Codec parameters object.
-                 *
-                 * @returns {Boolean}
-                 */
-                exports.isSameProfile = function (params1 = {}, params2 = {}) {
-                    const profile_level_id_1 = exports.parseSdpProfileLevelId(params1);
-                    const profile_level_id_2 = exports.parseSdpProfileLevelId(params2);
-
-                    // Compare H264 profiles, but not levels.
-                    return Boolean(
-                        profile_level_id_1 &&
-                            profile_level_id_2 &&
-                            profile_level_id_1.profile === profile_level_id_2.profile,
-                    );
-                };
-
-                /**
-                 * Generate codec parameters that will be used as answer in an SDP negotiation
-                 * based on local supported parameters and remote offered parameters. Both
-                 * local_supported_params and remote_offered_params represent sendrecv media
-                 * descriptions, i.e they are a mix of both encode and decode capabilities. In
-                 * theory, when the profile in local_supported_params represent a strict superset
-                 * of the profile in remote_offered_params, we could limit the profile in the
-                 * answer to the profile in remote_offered_params.
-                 *
-                 * However, to simplify the code, each supported H264 profile should be listed
-                 * explicitly in the list of local supported codecs, even if they are redundant.
-                 * Then each local codec in the list should be tested one at a time against the
-                 * remote codec, and only when the profiles are equal should this function be
-                 * called. Therefore, this function does not need to handle profile intersection,
-                 * and the profile of local_supported_params and remote_offered_params must be
-                 * equal before calling this function. The parameters that are used when
-                 * negotiating are the level part of profile-level-id and level-asymmetry-allowed.
-                 *
-                 * @param {Object} [local_supported_params={}]
-                 * @param {Object} [remote_offered_params={}]
-                 *
-                 * @returns {String} Canonical string representation as three hex bytes of the
-                 *   profile level id, or null if no one of the params have profile-level-id.
-                 *
-                 * @throws {TypeError} If Profile mismatch or invalid params.
-                 */
-                exports.generateProfileLevelIdForAnswer = function (
-                    local_supported_params = {},
-                    remote_offered_params = {},
-                ) {
-                    // If both local and remote params do not contain profile-level-id, they are
-                    // both using the default profile. In this case, don't return anything.
-                    if (!local_supported_params['profile-level-id'] && !remote_offered_params['profile-level-id']) {
-                        debug('generateProfileLevelIdForAnswer() | no profile-level-id in local and remote params');
-
-                        return null;
-                    }
-
-                    // Parse profile-level-ids.
-                    const local_profile_level_id = exports.parseSdpProfileLevelId(local_supported_params);
-                    const remote_profile_level_id = exports.parseSdpProfileLevelId(remote_offered_params);
-
-                    // The local and remote codec must have valid and equal H264 Profiles.
-                    if (!local_profile_level_id) throw new TypeError('invalid local_profile_level_id');
-
-                    if (!remote_profile_level_id) throw new TypeError('invalid remote_profile_level_id');
-
-                    if (local_profile_level_id.profile !== remote_profile_level_id.profile)
-                        throw new TypeError('H264 Profile mismatch');
-
-                    // Parse level information.
-                    const level_asymmetry_allowed =
-                        isLevelAsymmetryAllowed(local_supported_params) &&
-                        isLevelAsymmetryAllowed(remote_offered_params);
-
-                    const local_level = local_profile_level_id.level;
-                    const remote_level = remote_profile_level_id.level;
-                    const min_level = minLevel(local_level, remote_level);
-
-                    // Determine answer level. When level asymmetry is not allowed, level upgrade
-                    // is not allowed, i.e., the level in the answer must be equal to or lower
-                    // than the level in the offer.
-                    const answer_level = level_asymmetry_allowed ? local_level : min_level;
-
-                    debug(
-                        'generateProfileLevelIdForAnswer() | result: [profile:%s, level:%s]',
-                        local_profile_level_id.profile,
-                        answer_level,
-                    );
-
-                    // Return the resulting profile-level-id for the answer parameters.
-                    return exports.profileLevelIdToString(
-                        new ProfileLevelId(local_profile_level_id.profile, answer_level),
-                    );
+                catch (error) { }
+            }
+            return new Promise((resolve, reject) => {
+                const pendingTask = {
+                    task,
+                    name,
+                    resolve,
+                    reject,
+                    stopped: false,
+                    enqueuedAt: new Date(),
+                    executedAt: undefined
                 };
-
-                // Convert a string of 8 characters into a byte where the positions containing
-                // character c will have their bit set. For example, c = 'x', str = "x1xx0000"
-                // will return 0b10110000.
-                function byteMaskString(c, str) {
-                    return (
-                        ((str[0] === c) << 7) |
-                        ((str[1] === c) << 6) |
-                        ((str[2] === c) << 5) |
-                        ((str[3] === c) << 4) |
-                        ((str[4] === c) << 3) |
-                        ((str[5] === c) << 2) |
-                        ((str[6] === c) << 1) |
-                        ((str[7] === c) << 0)
-                    );
+                // Append task to the queue.
+                this.pendingTasks.push(pendingTask);
+                // And run it if this is the only task in the queue.
+                if (this.pendingTasks.length === 1)
+                    this.next();
+            });
+        });
+    }
+    /**
+     * Make ongoing pending tasks reject with the given StoppedErrorClass error.
+     * The AwaitQueue instance is still usable for future tasks added via push()
+     * method.
+     */
+    stop() {
+        if (this.closed)
+            return;
+        for (const pendingTask of this.pendingTasks) {
+            pendingTask.stopped = true;
+            pendingTask.reject(new this.StoppedErrorClass('AwaitQueue stopped'));
+        }
+        // Enpty the pending tasks array.
+        this.pendingTasks.length = 0;
+    }
+    dump() {
+        const now = new Date();
+        return this.pendingTasks.map((pendingTask) => {
+            return {
+                task: pendingTask.task,
+                name: pendingTask.name,
+                enqueuedTime: pendingTask.executedAt
+                    ? pendingTask.executedAt.getTime() - pendingTask.enqueuedAt.getTime()
+                    : now.getTime() - pendingTask.enqueuedAt.getTime(),
+                executingTime: pendingTask.executedAt
+                    ? now.getTime() - pendingTask.executedAt.getTime()
+                    : 0
+            };
+        });
+    }
+    next() {
+        return __awaiter(this, void 0, void 0, function* () {
+            // Take the first pending task.
+            const pendingTask = this.pendingTasks[0];
+            if (!pendingTask)
+                return;
+            // Execute it.
+            yield this.executeTask(pendingTask);
+            // Remove the first pending task (the completed one) from the queue.
+            this.pendingTasks.shift();
+            // And continue.
+            this.next();
+        });
+    }
+    executeTask(pendingTask) {
+        return __awaiter(this, void 0, void 0, function* () {
+            // If the task is stopped, ignore it.
+            if (pendingTask.stopped)
+                return;
+            pendingTask.executedAt = new Date();
+            try {
+                const result = yield pendingTask.task();
+                // If the task is stopped, ignore it.
+                if (pendingTask.stopped)
+                    return;
+                // Resolve the task with the returned result (if any).
+                pendingTask.resolve(result);
+            }
+            catch (error) {
+                // If the task is stopped, ignore it.
+                if (pendingTask.stopped)
+                    return;
+                // Reject the task with its own error.
+                pendingTask.reject(error);
+            }
+        });
+    }
+}
+exports.AwaitQueue = AwaitQueue;
+
+},{}],3:[function(require,module,exports){
+!function(e,t){"object"==typeof exports&&"object"==typeof module?module.exports=t():"function"==typeof define&&define.amd?define([],t):"object"==typeof exports?exports.bowser=t():e.bowser=t()}(this,(function(){return function(e){var t={};function r(n){if(t[n])return t[n].exports;var i=t[n]={i:n,l:!1,exports:{}};return e[n].call(i.exports,i,i.exports,r),i.l=!0,i.exports}return r.m=e,r.c=t,r.d=function(e,t,n){r.o(e,t)||Object.defineProperty(e,t,{enumerable:!0,get:n})},r.r=function(e){"undefined"!=typeof Symbol&&Symbol.toStringTag&&Object.defineProperty(e,Symbol.toStringTag,{value:"Module"}),Object.defineProperty(e,"__esModule",{value:!0})},r.t=function(e,t){if(1&t&&(e=r(e)),8&t)return e;if(4&t&&"object"==typeof e&&e&&e.__esModule)return e;var n=Object.create(null);if(r.r(n),Object.defineProperty(n,"default",{enumerable:!0,value:e}),2&t&&"string"!=typeof e)for(var i in e)r.d(n,i,function(t){return e[t]}.bind(null,i));return n},r.n=function(e){var t=e&&e.__esModule?function(){return 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+},{}],4:[function(require,module,exports){
+const debug = require('debug')('h264-profile-level-id');
+
+/* eslint-disable no-console */
+debug.log = console.info.bind(console);
+/* eslint-enable no-console */
+
+const ProfileConstrainedBaseline = 1;
+const ProfileBaseline = 2;
+const ProfileMain = 3;
+const ProfileConstrainedHigh = 4;
+const ProfileHigh = 5;
+
+exports.ProfileConstrainedBaseline = ProfileConstrainedBaseline;
+exports.ProfileBaseline = ProfileBaseline;
+exports.ProfileMain = ProfileMain;
+exports.ProfileConstrainedHigh = ProfileConstrainedHigh;
+exports.ProfileHigh = ProfileHigh;
+
+// All values are equal to ten times the level number, except level 1b which is
+// special.
+const Level1_b = 0;
+const Level1 = 10;
+const Level1_1 = 11;
+const Level1_2 = 12;
+const Level1_3 = 13;
+const Level2 = 20;
+const Level2_1 = 21;
+const Level2_2 = 22;
+const Level3 = 30;
+const Level3_1 = 31;
+const Level3_2 = 32;
+const Level4 = 40;
+const Level4_1 = 41;
+const Level4_2 = 42;
+const Level5 = 50;
+const Level5_1 = 51;
+const Level5_2 = 52;
+
+exports.Level1_b = Level1_b;
+exports.Level1 = Level1;
+exports.Level1_1 = Level1_1;
+exports.Level1_2 = Level1_2;
+exports.Level1_3 = Level1_3;
+exports.Level2 = Level2;
+exports.Level2_1 = Level2_1;
+exports.Level2_2 = Level2_2;
+exports.Level3 = Level3;
+exports.Level3_1 = Level3_1;
+exports.Level3_2 = Level3_2;
+exports.Level4 = Level4;
+exports.Level4_1 = Level4_1;
+exports.Level4_2 = Level4_2;
+exports.Level5 = Level5;
+exports.Level5_1 = Level5_1;
+exports.Level5_2 = Level5_2;
+
+class ProfileLevelId
+{
+	constructor(profile, level)
+	{
+		this.profile = profile;
+		this.level = level;
+	}
+}
+
+exports.ProfileLevelId = ProfileLevelId;
+
+// Default ProfileLevelId.
+//
+// TODO: The default should really be profile Baseline and level 1 according to
+// the spec: https://tools.ietf.org/html/rfc6184#section-8.1. In order to not
+// break backwards compatibility with older versions of WebRTC where external
+// codecs don't have any parameters, use profile ConstrainedBaseline level 3_1
+// instead. This workaround will only be done in an interim period to allow
+// external clients to update their code.
+//
+// http://crbug/webrtc/6337.
+const DefaultProfileLevelId =
+	new ProfileLevelId(ProfileConstrainedBaseline, Level3_1);
+
+// For level_idc=11 and profile_idc=0x42, 0x4D, or 0x58, the constraint set3
+// flag specifies if level 1b or level 1.1 is used.
+const ConstraintSet3Flag = 0x10;
+
+// Class for matching bit patterns such as "x1xx0000" where 'x' is allowed to be
+// either 0 or 1.
+class BitPattern
+{
+	constructor(str)
+	{
+		this._mask = ~byteMaskString('x', str);
+		this._maskedValue = byteMaskString('1', str);
+	}
+
+	isMatch(value)
+	{
+		return this._maskedValue === (value & this._mask);
+	}
+}
+
+// Class for converting between profile_idc/profile_iop to Profile.
+class ProfilePattern
+{
+	constructor(profile_idc, profile_iop, profile)
+	{
+		this.profile_idc = profile_idc;
+		this.profile_iop = profile_iop;
+		this.profile = profile;
+	}
+}
+
+// This is from https://tools.ietf.org/html/rfc6184#section-8.1.
+const ProfilePatterns =
+[
+	new ProfilePattern(0x42, new BitPattern('x1xx0000'), ProfileConstrainedBaseline),
+	new ProfilePattern(0x4D, new BitPattern('1xxx0000'), ProfileConstrainedBaseline),
+	new ProfilePattern(0x58, new BitPattern('11xx0000'), ProfileConstrainedBaseline),
+	new ProfilePattern(0x42, new BitPattern('x0xx0000'), ProfileBaseline),
+	new ProfilePattern(0x58, new BitPattern('10xx0000'), ProfileBaseline),
+	new ProfilePattern(0x4D, new BitPattern('0x0x0000'), ProfileMain),
+	new ProfilePattern(0x64, new BitPattern('00000000'), ProfileHigh),
+	new ProfilePattern(0x64, new BitPattern('00001100'), ProfileConstrainedHigh)
+];
+
+/**
+ * Parse profile level id that is represented as a string of 3 hex bytes.
+ * Nothing will be returned if the string is not a recognized H264 profile
+ * level id.
+ *
+ * @param {String} str - profile-level-id value as a string of 3 hex bytes.
+ *
+ * @returns {ProfileLevelId}
+ */
+exports.parseProfileLevelId = function(str)
+{
+	// The string should consist of 3 bytes in hexadecimal format.
+	if (typeof str !== 'string' || str.length !== 6)
+		return null;
+
+	const profile_level_id_numeric = parseInt(str, 16);
+
+	if (profile_level_id_numeric === 0)
+		return null;
+
+	// Separate into three bytes.
+	const level_idc = profile_level_id_numeric & 0xFF;
+	const profile_iop = (profile_level_id_numeric >> 8) & 0xFF;
+	const profile_idc = (profile_level_id_numeric >> 16) & 0xFF;
+
+	// Parse level based on level_idc and constraint set 3 flag.
+	let level;
+
+	switch (level_idc)
+	{
+		case Level1_1:
+		{
+			level = (profile_iop & ConstraintSet3Flag) !== 0 ? Level1_b : Level1_1;
+			break;
+		}
+		case Level1:
+		case Level1_2:
+		case Level1_3:
+		case Level2:
+		case Level2_1:
+		case Level2_2:
+		case Level3:
+		case Level3_1:
+		case Level3_2:
+		case Level4:
+		case Level4_1:
+		case Level4_2:
+		case Level5:
+		case Level5_1:
+		case Level5_2:
+		{
+			level = level_idc;
+			break;
+		}
+		// Unrecognized level_idc.
+		default:
+		{
+			debug('parseProfileLevelId() | unrecognized level_idc:%s', level_idc);
+
+			return null;
+		}
+	}
+
+	// Parse profile_idc/profile_iop into a Profile enum.
+	for (const pattern of ProfilePatterns)
+	{
+		if (
+			profile_idc === pattern.profile_idc &&
+			pattern.profile_iop.isMatch(profile_iop)
+		)
+		{
+			return new ProfileLevelId(pattern.profile, level);
+		}
+	}
+
+	debug('parseProfileLevelId() | unrecognized profile_idc/profile_iop combination');
+
+	return null;
+};
+
+/**
+ * Returns canonical string representation as three hex bytes of the profile
+ * level id, or returns nothing for invalid profile level ids.
+ *
+ * @param {ProfileLevelId} profile_level_id
+ *
+ * @returns {String}
+ */
+exports.profileLevelIdToString = function(profile_level_id)
+{
+	// Handle special case level == 1b.
+	if (profile_level_id.level == Level1_b)
+	{
+		switch (profile_level_id.profile)
+		{
+			case ProfileConstrainedBaseline:
+			{
+				return '42f00b';
+			}
+			case ProfileBaseline:
+			{
+				return '42100b';
+			}
+			case ProfileMain:
+			{
+				return '4d100b';
+			}
+			// Level 1_b is not allowed for other profiles.
+			default:
+			{
+				debug(
+					'profileLevelIdToString() | Level 1_b not is allowed for profile:%s',
+					profile_level_id.profile);
+
+				return null;
+			}
+		}
+	}
+
+	let profile_idc_iop_string;
+
+	switch (profile_level_id.profile)
+	{
+		case ProfileConstrainedBaseline:
+		{
+			profile_idc_iop_string = '42e0';
+			break;
+		}
+		case ProfileBaseline:
+		{
+			profile_idc_iop_string = '4200';
+			break;
+		}
+		case ProfileMain:
+		{
+			profile_idc_iop_string = '4d00';
+			break;
+		}
+		case ProfileConstrainedHigh:
+		{
+			profile_idc_iop_string = '640c';
+			break;
+		}
+		case ProfileHigh:
+		{
+			profile_idc_iop_string = '6400';
+			break;
+		}
+		default:
+		{
+			debug(
+				'profileLevelIdToString() | unrecognized profile:%s',
+				profile_level_id.profile);
+
+			return null;
+		}
+	}
+
+	let levelStr = (profile_level_id.level).toString(16);
+
+	if (levelStr.length === 1)
+		levelStr = `0${levelStr}`;
+
+	return `${profile_idc_iop_string}${levelStr}`;
+};
+
+/**
+ * Parse profile level id that is represented as a string of 3 hex bytes
+ * contained in an SDP key-value map. A default profile level id will be
+ * returned if the profile-level-id key is missing. Nothing will be returned if
+ * the key is present but the string is invalid.
+ *
+ * @param {Object} [params={}] - Codec parameters object.
+ *
+ * @returns {ProfileLevelId}
+ */
+exports.parseSdpProfileLevelId = function(params = {})
+{
+	const profile_level_id = params['profile-level-id'];
+
+	return !profile_level_id
+		? DefaultProfileLevelId
+		: exports.parseProfileLevelId(profile_level_id);
+};
+
+/**
+ * Returns true if the parameters have the same H264 profile, i.e. the same
+ * H264 profile (Baseline, High, etc).
+ *
+ * @param {Object} [params1={}] - Codec parameters object.
+ * @param {Object} [params2={}] - Codec parameters object.
+ *
+ * @returns {Boolean}
+ */
+exports.isSameProfile = function(params1 = {}, params2 = {})
+{
+	const profile_level_id_1 = exports.parseSdpProfileLevelId(params1);
+	const profile_level_id_2 = exports.parseSdpProfileLevelId(params2);
+
+	// Compare H264 profiles, but not levels.
+	return Boolean(
+		profile_level_id_1 &&
+		profile_level_id_2 &&
+		profile_level_id_1.profile === profile_level_id_2.profile
+	);
+};
+
+/**
+ * Generate codec parameters that will be used as answer in an SDP negotiation
+ * based on local supported parameters and remote offered parameters. Both
+ * local_supported_params and remote_offered_params represent sendrecv media
+ * descriptions, i.e they are a mix of both encode and decode capabilities. In
+ * theory, when the profile in local_supported_params represent a strict superset
+ * of the profile in remote_offered_params, we could limit the profile in the
+ * answer to the profile in remote_offered_params.
+ *
+ * However, to simplify the code, each supported H264 profile should be listed
+ * explicitly in the list of local supported codecs, even if they are redundant.
+ * Then each local codec in the list should be tested one at a time against the
+ * remote codec, and only when the profiles are equal should this function be
+ * called. Therefore, this function does not need to handle profile intersection,
+ * and the profile of local_supported_params and remote_offered_params must be
+ * equal before calling this function. The parameters that are used when
+ * negotiating are the level part of profile-level-id and level-asymmetry-allowed.
+ *
+ * @param {Object} [local_supported_params={}]
+ * @param {Object} [remote_offered_params={}]
+ *
+ * @returns {String} Canonical string representation as three hex bytes of the
+ *   profile level id, or null if no one of the params have profile-level-id.
+ *
+ * @throws {TypeError} If Profile mismatch or invalid params.
+ */
+exports.generateProfileLevelIdForAnswer = function(
+	local_supported_params = {},
+	remote_offered_params = {}
+)
+{
+	// If both local and remote params do not contain profile-level-id, they are
+	// both using the default profile. In this case, don't return anything.
+	if (
+		!local_supported_params['profile-level-id'] &&
+		!remote_offered_params['profile-level-id']
+	)
+	{
+		debug(
+			'generateProfileLevelIdForAnswer() | no profile-level-id in local and remote params');
+
+		return null;
+	}
+
+	// Parse profile-level-ids.
+	const local_profile_level_id =
+		exports.parseSdpProfileLevelId(local_supported_params);
+	const remote_profile_level_id =
+		exports.parseSdpProfileLevelId(remote_offered_params);
+
+	// The local and remote codec must have valid and equal H264 Profiles.
+	if (!local_profile_level_id)
+		throw new TypeError('invalid local_profile_level_id');
+
+	if (!remote_profile_level_id)
+		throw new TypeError('invalid remote_profile_level_id');
+
+	if (local_profile_level_id.profile !== remote_profile_level_id.profile)
+		throw new TypeError('H264 Profile mismatch');
+
+	// Parse level information.
+	const level_asymmetry_allowed = (
+		isLevelAsymmetryAllowed(local_supported_params) &&
+		isLevelAsymmetryAllowed(remote_offered_params)
+	);
+
+	const local_level = local_profile_level_id.level;
+	const remote_level = remote_profile_level_id.level;
+	const min_level = minLevel(local_level, remote_level);
+
+	// Determine answer level. When level asymmetry is not allowed, level upgrade
+	// is not allowed, i.e., the level in the answer must be equal to or lower
+	// than the level in the offer.
+	const answer_level = level_asymmetry_allowed ? local_level : min_level;
+
+	debug(
+		'generateProfileLevelIdForAnswer() | result: [profile:%s, level:%s]',
+		local_profile_level_id.profile, answer_level);
+
+	// Return the resulting profile-level-id for the answer parameters.
+	return exports.profileLevelIdToString(
+		new ProfileLevelId(local_profile_level_id.profile, answer_level));
+};
+
+// Convert a string of 8 characters into a byte where the positions containing
+// character c will have their bit set. For example, c = 'x', str = "x1xx0000"
+// will return 0b10110000.
+function byteMaskString(c, str)
+{
+	return (
+		((str[0] === c) << 7) | ((str[1] === c) << 6) | ((str[2] === c) << 5) |
+		((str[3] === c) << 4)	| ((str[4] === c) << 3)	| ((str[5] === c) << 2)	|
+		((str[6] === c) << 1)	| ((str[7] === c) << 0)
+	);
+}
+
+// Compare H264 levels and handle the level 1b case.
+function isLessLevel(a, b)
+{
+	if (a === Level1_b)
+		return b !== Level1 && b !== Level1_b;
+
+	if (b === Level1_b)
+		return a !== Level1;
+
+	return a < b;
+}
+
+function minLevel(a, b)
+{
+	return isLessLevel(a, b) ? a : b;
+}
+
+function isLevelAsymmetryAllowed(params = {})
+{
+	const level_asymmetry_allowed = params['level-asymmetry-allowed'];
+
+	return (
+		level_asymmetry_allowed === 1 ||
+		level_asymmetry_allowed === '1'
+	);
+}
+
+},{"debug":5}],5:[function(require,module,exports){
+(function (process){(function (){
+/* eslint-env browser */
+
+/**
+ * This is the web browser implementation of `debug()`.
+ */
+
+exports.formatArgs = formatArgs;
+exports.save = save;
+exports.load = load;
+exports.useColors = useColors;
+exports.storage = localstorage();
+exports.destroy = (() => {
+	let warned = false;
+
+	return () => {
+		if (!warned) {
+			warned = true;
+			console.warn('Instance method `debug.destroy()` is deprecated and no longer does anything. It will be removed in the next major version of `debug`.');
+		}
+	};
+})();
+
+/**
+ * Colors.
+ */
+
+exports.colors = [
+	'#0000CC',
+	'#0000FF',
+	'#0033CC',
+	'#0033FF',
+	'#0066CC',
+	'#0066FF',
+	'#0099CC',
+	'#0099FF',
+	'#00CC00',
+	'#00CC33',
+	'#00CC66',
+	'#00CC99',
+	'#00CCCC',
+	'#00CCFF',
+	'#3300CC',
+	'#3300FF',
+	'#3333CC',
+	'#3333FF',
+	'#3366CC',
+	'#3366FF',
+	'#3399CC',
+	'#3399FF',
+	'#33CC00',
+	'#33CC33',
+	'#33CC66',
+	'#33CC99',
+	'#33CCCC',
+	'#33CCFF',
+	'#6600CC',
+	'#6600FF',
+	'#6633CC',
+	'#6633FF',
+	'#66CC00',
+	'#66CC33',
+	'#9900CC',
+	'#9900FF',
+	'#9933CC',
+	'#9933FF',
+	'#99CC00',
+	'#99CC33',
+	'#CC0000',
+	'#CC0033',
+	'#CC0066',
+	'#CC0099',
+	'#CC00CC',
+	'#CC00FF',
+	'#CC3300',
+	'#CC3333',
+	'#CC3366',
+	'#CC3399',
+	'#CC33CC',
+	'#CC33FF',
+	'#CC6600',
+	'#CC6633',
+	'#CC9900',
+	'#CC9933',
+	'#CCCC00',
+	'#CCCC33',
+	'#FF0000',
+	'#FF0033',
+	'#FF0066',
+	'#FF0099',
+	'#FF00CC',
+	'#FF00FF',
+	'#FF3300',
+	'#FF3333',
+	'#FF3366',
+	'#FF3399',
+	'#FF33CC',
+	'#FF33FF',
+	'#FF6600',
+	'#FF6633',
+	'#FF9900',
+	'#FF9933',
+	'#FFCC00',
+	'#FFCC33'
+];
+
+/**
+ * Currently only WebKit-based Web Inspectors, Firefox >= v31,
+ * and the Firebug extension (any Firefox version) are known
+ * to support "%c" CSS customizations.
+ *
+ * TODO: add a `localStorage` variable to explicitly enable/disable colors
+ */
+
+// eslint-disable-next-line complexity
+function useColors() {
+	// NB: In an Electron preload script, document will be defined but not fully
+	// initialized. Since we know we're in Chrome, we'll just detect this case
+	// explicitly
+	if (typeof window !== 'undefined' && window.process && (window.process.type === 'renderer' || window.process.__nwjs)) {
+		return true;
+	}
+
+	// Internet Explorer and Edge do not support colors.
+	if (typeof navigator !== 'undefined' && navigator.userAgent && navigator.userAgent.toLowerCase().match(/(edge|trident)\/(\d+)/)) {
+		return false;
+	}
+
+	// Is webkit? http://stackoverflow.com/a/16459606/376773
+	// document is undefined in react-native: https://github.com/facebook/react-native/pull/1632
+	return (typeof document !== 'undefined' && document.documentElement && document.documentElement.style && document.documentElement.style.WebkitAppearance) ||
+		// Is firebug? http://stackoverflow.com/a/398120/376773
+		(typeof window !== 'undefined' && window.console && (window.console.firebug || (window.console.exception && window.console.table))) ||
+		// Is firefox >= v31?
+		// https://developer.mozilla.org/en-US/docs/Tools/Web_Console#Styling_messages
+		(typeof navigator !== 'undefined' && navigator.userAgent && navigator.userAgent.toLowerCase().match(/firefox\/(\d+)/) && parseInt(RegExp.$1, 10) >= 31) ||
+		// Double check webkit in userAgent just in case we are in a worker
+		(typeof navigator !== 'undefined' && navigator.userAgent && navigator.userAgent.toLowerCase().match(/applewebkit\/(\d+)/));
+}
+
+/**
+ * Colorize log arguments if enabled.
+ *
+ * @api public
+ */
+
+function formatArgs(args) {
+	args[0] = (this.useColors ? '%c' : '') +
+		this.namespace +
+		(this.useColors ? ' %c' : ' ') +
+		args[0] +
+		(this.useColors ? '%c ' : ' ') +
+		'+' + module.exports.humanize(this.diff);
+
+	if (!this.useColors) {
+		return;
+	}
+
+	const c = 'color: ' + this.color;
+	args.splice(1, 0, c, 'color: inherit');
+
+	// The final "%c" is somewhat tricky, because there could be other
+	// arguments passed either before or after the %c, so we need to
+	// figure out the correct index to insert the CSS into
+	let index = 0;
+	let lastC = 0;
+	args[0].replace(/%[a-zA-Z%]/g, match => {
+		if (match === '%%') {
+			return;
+		}
+		index++;
+		if (match === '%c') {
+			// We only are interested in the *last* %c
+			// (the user may have provided their own)
+			lastC = index;
+		}
+	});
+
+	args.splice(lastC, 0, c);
+}
+
+/**
+ * Invokes `console.debug()` when available.
+ * No-op when `console.debug` is not a "function".
+ * If `console.debug` is not available, falls back
+ * to `console.log`.
+ *
+ * @api public
+ */
+exports.log = console.debug || console.log || (() => {});
+
+/**
+ * Save `namespaces`.
+ *
+ * @param {String} namespaces
+ * @api private
+ */
+function save(namespaces) {
+	try {
+		if (namespaces) {
+			exports.storage.setItem('debug', namespaces);
+		} else {
+			exports.storage.removeItem('debug');
+		}
+	} catch (error) {
+		// Swallow
+		// XXX (@Qix-) should we be logging these?
+	}
+}
+
+/**
+ * Load `namespaces`.
+ *
+ * @return {String} returns the previously persisted debug modes
+ * @api private
+ */
+function load() {
+	let r;
+	try {
+		r = exports.storage.getItem('debug');
+	} catch (error) {
+		// Swallow
+		// XXX (@Qix-) should we be logging these?
+	}
+
+	// If debug isn't set in LS, and we're in Electron, try to load $DEBUG
+	if (!r && typeof process !== 'undefined' && 'env' in process) {
+		r = process.env.DEBUG;
+	}
+
+	return r;
+}
+
+/**
+ * Localstorage attempts to return the localstorage.
+ *
+ * This is necessary because safari throws
+ * when a user disables cookies/localstorage
+ * and you attempt to access it.
+ *
+ * @return {LocalStorage}
+ * @api private
+ */
+
+function localstorage() {
+	try {
+		// TVMLKit (Apple TV JS Runtime) does not have a window object, just localStorage in the global context
+		// The Browser also has localStorage in the global context.
+		return localStorage;
+	} catch (error) {
+		// Swallow
+		// XXX (@Qix-) should we be logging these?
+	}
+}
+
+module.exports = require('./common')(exports);
+
+const {formatters} = module.exports;
+
+/**
+ * Map %j to `JSON.stringify()`, since no Web Inspectors do that by default.
+ */
+
+formatters.j = function (v) {
+	try {
+		return JSON.stringify(v);
+	} catch (error) {
+		return '[UnexpectedJSONParseError]: ' + error.message;
+	}
+};
+
+}).call(this)}).call(this,require('_process'))
+},{"./common":6,"_process":48}],6:[function(require,module,exports){
+
+/**
+ * This is the common logic for both the Node.js and web browser
+ * implementations of `debug()`.
+ */
+
+function setup(env) {
+	createDebug.debug = createDebug;
+	createDebug.default = createDebug;
+	createDebug.coerce = coerce;
+	createDebug.disable = disable;
+	createDebug.enable = enable;
+	createDebug.enabled = enabled;
+	createDebug.humanize = require('ms');
+	createDebug.destroy = destroy;
+
+	Object.keys(env).forEach(key => {
+		createDebug[key] = env[key];
+	});
+
+	/**
+	* The currently active debug mode names, and names to skip.
+	*/
+
+	createDebug.names = [];
+	createDebug.skips = [];
+
+	/**
+	* Map of special "%n" handling functions, for the debug "format" argument.
+	*
+	* Valid key names are a single, lower or upper-case letter, i.e. "n" and "N".
+	*/
+	createDebug.formatters = {};
+
+	/**
+	* Selects a color for a debug namespace
+	* @param {String} namespace The namespace string for the for the debug instance to be colored
+	* @return {Number|String} An ANSI color code for the given namespace
+	* @api private
+	*/
+	function selectColor(namespace) {
+		let hash = 0;
+
+		for (let i = 0; i < namespace.length; i++) {
+			hash = ((hash << 5) - hash) + namespace.charCodeAt(i);
+			hash |= 0; // Convert to 32bit integer
+		}
+
+		return createDebug.colors[Math.abs(hash) % createDebug.colors.length];
+	}
+	createDebug.selectColor = selectColor;
+
+	/**
+	* Create a debugger with the given `namespace`.
+	*
+	* @param {String} namespace
+	* @return {Function}
+	* @api public
+	*/
+	function createDebug(namespace) {
+		let prevTime;
+		let enableOverride = null;
+		let namespacesCache;
+		let enabledCache;
+
+		function debug(...args) {
+			// Disabled?
+			if (!debug.enabled) {
+				return;
+			}
+
+			const self = debug;
+
+			// Set `diff` timestamp
+			const curr = Number(new Date());
+			const ms = curr - (prevTime || curr);
+			self.diff = ms;
+			self.prev = prevTime;
+			self.curr = curr;
+			prevTime = curr;
+
+			args[0] = createDebug.coerce(args[0]);
+
+			if (typeof args[0] !== 'string') {
+				// Anything else let's inspect with %O
+				args.unshift('%O');
+			}
+
+			// Apply any `formatters` transformations
+			let index = 0;
+			args[0] = args[0].replace(/%([a-zA-Z%])/g, (match, format) => {
+				// If we encounter an escaped % then don't increase the array index
+				if (match === '%%') {
+					return '%';
+				}
+				index++;
+				const formatter = createDebug.formatters[format];
+				if (typeof formatter === 'function') {
+					const val = args[index];
+					match = formatter.call(self, val);
+
+					// Now we need to remove `args[index]` since it's inlined in the `format`
+					args.splice(index, 1);
+					index--;
+				}
+				return match;
+			});
+
+			// Apply env-specific formatting (colors, etc.)
+			createDebug.formatArgs.call(self, args);
+
+			const logFn = self.log || createDebug.log;
+			logFn.apply(self, args);
+		}
+
+		debug.namespace = namespace;
+		debug.useColors = createDebug.useColors();
+		debug.color = createDebug.selectColor(namespace);
+		debug.extend = extend;
+		debug.destroy = createDebug.destroy; // XXX Temporary. Will be removed in the next major release.
+
+		Object.defineProperty(debug, 'enabled', {
+			enumerable: true,
+			configurable: false,
+			get: () => {
+				if (enableOverride !== null) {
+					return enableOverride;
+				}
+				if (namespacesCache !== createDebug.namespaces) {
+					namespacesCache = createDebug.namespaces;
+					enabledCache = createDebug.enabled(namespace);
+				}
+
+				return enabledCache;
+			},
+			set: v => {
+				enableOverride = v;
+			}
+		});
+
+		// Env-specific initialization logic for debug instances
+		if (typeof createDebug.init === 'function') {
+			createDebug.init(debug);
+		}
+
+		return debug;
+	}
+
+	function extend(namespace, delimiter) {
+		const newDebug = createDebug(this.namespace + (typeof delimiter === 'undefined' ? ':' : delimiter) + namespace);
+		newDebug.log = this.log;
+		return newDebug;
+	}
+
+	/**
+	* Enables a debug mode by namespaces. This can include modes
+	* separated by a colon and wildcards.
+	*
+	* @param {String} namespaces
+	* @api public
+	*/
+	function enable(namespaces) {
+		createDebug.save(namespaces);
+		createDebug.namespaces = namespaces;
+
+		createDebug.names = [];
+		createDebug.skips = [];
+
+		let i;
+		const split = (typeof namespaces === 'string' ? namespaces : '').split(/[\s,]+/);
+		const len = split.length;
+
+		for (i = 0; i < len; i++) {
+			if (!split[i]) {
+				// ignore empty strings
+				continue;
+			}
+
+			namespaces = split[i].replace(/\*/g, '.*?');
+
+			if (namespaces[0] === '-') {
+				createDebug.skips.push(new RegExp('^' + namespaces.substr(1) + '$'));
+			} else {
+				createDebug.names.push(new RegExp('^' + namespaces + '$'));
+			}
+		}
+	}
+
+	/**
+	* Disable debug output.
+	*
+	* @return {String} namespaces
+	* @api public
+	*/
+	function disable() {
+		const namespaces = [
+			...createDebug.names.map(toNamespace),
+			...createDebug.skips.map(toNamespace).map(namespace => '-' + namespace)
+		].join(',');
+		createDebug.enable('');
+		return namespaces;
+	}
+
+	/**
+	* Returns true if the given mode name is enabled, false otherwise.
+	*
+	* @param {String} name
+	* @return {Boolean}
+	* @api public
+	*/
+	function enabled(name) {
+		if (name[name.length - 1] === '*') {
+			return true;
+		}
+
+		let i;
+		let len;
+
+		for (i = 0, len = createDebug.skips.length; i < len; i++) {
+			if (createDebug.skips[i].test(name)) {
+				return false;
+			}
+		}
+
+		for (i = 0, len = createDebug.names.length; i < len; i++) {
+			if (createDebug.names[i].test(name)) {
+				return true;
+			}
+		}
+
+		return false;
+	}
+
+	/**
+	* Convert regexp to namespace
+	*
+	* @param {RegExp} regxep
+	* @return {String} namespace
+	* @api private
+	*/
+	function toNamespace(regexp) {
+		return regexp.toString()
+			.substring(2, regexp.toString().length - 2)
+			.replace(/\.\*\?$/, '*');
+	}
+
+	/**
+	* Coerce `val`.
+	*
+	* @param {Mixed} val
+	* @return {Mixed}
+	* @api private
+	*/
+	function coerce(val) {
+		if (val instanceof Error) {
+			return val.stack || val.message;
+		}
+		return val;
+	}
+
+	/**
+	* XXX DO NOT USE. This is a temporary stub function.
+	* XXX It WILL be removed in the next major release.
+	*/
+	function destroy() {
+		console.warn('Instance method `debug.destroy()` is deprecated and no longer does anything. It will be removed in the next major version of `debug`.');
+	}
+
+	createDebug.enable(createDebug.load());
+
+	return createDebug;
+}
+
+module.exports = setup;
+
+},{"ms":7}],7:[function(require,module,exports){
+/**
+ * Helpers.
+ */
+
+var s = 1000;
+var m = s * 60;
+var h = m * 60;
+var d = h * 24;
+var w = d * 7;
+var y = d * 365.25;
+
+/**
+ * Parse or format the given `val`.
+ *
+ * Options:
+ *
+ *  - `long` verbose formatting [false]
+ *
+ * @param {String|Number} val
+ * @param {Object} [options]
+ * @throws {Error} throw an error if val is not a non-empty string or a number
+ * @return {String|Number}
+ * @api public
+ */
+
+module.exports = function(val, options) {
+  options = options || {};
+  var type = typeof val;
+  if (type === 'string' && val.length > 0) {
+    return parse(val);
+  } else if (type === 'number' && isFinite(val)) {
+    return options.long ? fmtLong(val) : fmtShort(val);
+  }
+  throw new Error(
+    'val is not a non-empty string or a valid number. val=' +
+      JSON.stringify(val)
+  );
+};
+
+/**
+ * Parse the given `str` and return milliseconds.
+ *
+ * @param {String} str
+ * @return {Number}
+ * @api private
+ */
+
+function parse(str) {
+  str = String(str);
+  if (str.length > 100) {
+    return;
+  }
+  var match = /^(-?(?:\d+)?\.?\d+) *(milliseconds?|msecs?|ms|seconds?|secs?|s|minutes?|mins?|m|hours?|hrs?|h|days?|d|weeks?|w|years?|yrs?|y)?$/i.exec(
+    str
+  );
+  if (!match) {
+    return;
+  }
+  var n = parseFloat(match[1]);
+  var type = (match[2] || 'ms').toLowerCase();
+  switch (type) {
+    case 'years':
+    case 'year':
+    case 'yrs':
+    case 'yr':
+    case 'y':
+      return n * y;
+    case 'weeks':
+    case 'week':
+    case 'w':
+      return n * w;
+    case 'days':
+    case 'day':
+    case 'd':
+      return n * d;
+    case 'hours':
+    case 'hour':
+    case 'hrs':
+    case 'hr':
+    case 'h':
+      return n * h;
+    case 'minutes':
+    case 'minute':
+    case 'mins':
+    case 'min':
+    case 'm':
+      return n * m;
+    case 'seconds':
+    case 'second':
+    case 'secs':
+    case 'sec':
+    case 's':
+      return n * s;
+    case 'milliseconds':
+    case 'millisecond':
+    case 'msecs':
+    case 'msec':
+    case 'ms':
+      return n;
+    default:
+      return undefined;
+  }
+}
+
+/**
+ * Short format for `ms`.
+ *
+ * @param {Number} ms
+ * @return {String}
+ * @api private
+ */
+
+function fmtShort(ms) {
+  var msAbs = Math.abs(ms);
+  if (msAbs >= d) {
+    return Math.round(ms / d) + 'd';
+  }
+  if (msAbs >= h) {
+    return Math.round(ms / h) + 'h';
+  }
+  if (msAbs >= m) {
+    return Math.round(ms / m) + 'm';
+  }
+  if (msAbs >= s) {
+    return Math.round(ms / s) + 's';
+  }
+  return ms + 'ms';
+}
+
+/**
+ * Long format for `ms`.
+ *
+ * @param {Number} ms
+ * @return {String}
+ * @api private
+ */
+
+function fmtLong(ms) {
+  var msAbs = Math.abs(ms);
+  if (msAbs >= d) {
+    return plural(ms, msAbs, d, 'day');
+  }
+  if (msAbs >= h) {
+    return plural(ms, msAbs, h, 'hour');
+  }
+  if (msAbs >= m) {
+    return plural(ms, msAbs, m, 'minute');
+  }
+  if (msAbs >= s) {
+    return plural(ms, msAbs, s, 'second');
+  }
+  return ms + ' ms';
+}
+
+/**
+ * Pluralization helper.
+ */
+
+function plural(ms, msAbs, n, name) {
+  var isPlural = msAbs >= n * 1.5;
+  return Math.round(ms / n) + ' ' + name + (isPlural ? 's' : '');
+}
+
+},{}],8:[function(require,module,exports){
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.Consumer = void 0;
+const Logger_1 = require("./Logger");
+const EnhancedEventEmitter_1 = require("./EnhancedEventEmitter");
+const errors_1 = require("./errors");
+const logger = new Logger_1.Logger('Consumer');
+class Consumer extends EnhancedEventEmitter_1.EnhancedEventEmitter {
+    /**
+     * @emits transportclose
+     * @emits trackended
+     * @emits @getstats
+     * @emits @close
+     */
+    constructor({ id, localId, producerId, rtpReceiver, track, rtpParameters, appData }) {
+        super();
+        // Closed flag.
+        this._closed = false;
+        // Observer instance.
+        this._observer = new EnhancedEventEmitter_1.EnhancedEventEmitter();
+        logger.debug('constructor()');
+        this._id = id;
+        this._localId = localId;
+        this._producerId = producerId;
+        this._rtpReceiver = rtpReceiver;
+        this._track = track;
+        this._rtpParameters = rtpParameters;
+        this._paused = !track.enabled;
+        this._appData = appData;
+        this._onTrackEnded = this._onTrackEnded.bind(this);
+        this._handleTrack();
+    }
+    /**
+     * Consumer id.
+     */
+    get id() {
+        return this._id;
+    }
+    /**
+     * Local id.
+     */
+    get localId() {
+        return this._localId;
+    }
+    /**
+     * Associated Producer id.
+     */
+    get producerId() {
+        return this._producerId;
+    }
+    /**
+     * Whether the Consumer is closed.
+     */
+    get closed() {
+        return this._closed;
+    }
+    /**
+     * Media kind.
+     */
+    get kind() {
+        return this._track.kind;
+    }
+    /**
+     * Associated RTCRtpReceiver.
+     */
+    get rtpReceiver() {
+        return this._rtpReceiver;
+    }
+    /**
+     * The associated track.
+     */
+    get track() {
+        return this._track;
+    }
+    /**
+     * RTP parameters.
+     */
+    get rtpParameters() {
+        return this._rtpParameters;
+    }
+    /**
+     * Whether the Consumer is paused.
+     */
+    get paused() {
+        return this._paused;
+    }
+    /**
+     * App custom data.
+     */
+    get appData() {
+        return this._appData;
+    }
+    /**
+     * Invalid setter.
+     */
+    set appData(appData) {
+        throw new Error('cannot override appData object');
+    }
+    /**
+     * Observer.
+     *
+     * @emits close
+     * @emits pause
+     * @emits resume
+     * @emits trackended
+     */
+    get observer() {
+        return this._observer;
+    }
+    /**
+     * Closes the Consumer.
+     */
+    close() {
+        if (this._closed)
+            return;
+        logger.debug('close()');
+        this._closed = true;
+        this._destroyTrack();
+        this.emit('@close');
+        // Emit observer event.
+        this._observer.safeEmit('close');
+    }
+    /**
+     * Transport was closed.
+     */
+    transportClosed() {
+        if (this._closed)
+            return;
+        logger.debug('transportClosed()');
+        this._closed = true;
+        this._destroyTrack();
+        this.safeEmit('transportclose');
+        // Emit observer event.
+        this._observer.safeEmit('close');
+    }
+    /**
+     * Get associated RTCRtpReceiver stats.
+     */
+    async getStats() {
+        if (this._closed)
+            throw new errors_1.InvalidStateError('closed');
+        return this.safeEmitAsPromise('@getstats');
+    }
+    /**
+     * Pauses receiving media.
+     */
+    pause() {
+        logger.debug('pause()');
+        if (this._closed) {
+            logger.error('pause() | Consumer closed');
+            return;
+        }
+        this._paused = true;
+        this._track.enabled = false;
+        // Emit observer event.
+        this._observer.safeEmit('pause');
+    }
+    /**
+     * Resumes receiving media.
+     */
+    resume() {
+        logger.debug('resume()');
+        if (this._closed) {
+            logger.error('resume() | Consumer closed');
+            return;
+        }
+        this._paused = false;
+        this._track.enabled = true;
+        // Emit observer event.
+        this._observer.safeEmit('resume');
+    }
+    _onTrackEnded() {
+        logger.debug('track "ended" event');
+        this.safeEmit('trackended');
+        // Emit observer event.
+        this._observer.safeEmit('trackended');
+    }
+    _handleTrack() {
+        this._track.addEventListener('ended', this._onTrackEnded);
+    }
+    _destroyTrack() {
+        try {
+            this._track.removeEventListener('ended', this._onTrackEnded);
+            this._track.stop();
+        }
+        catch (error) { }
+    }
+}
+exports.Consumer = Consumer;
+
+},{"./EnhancedEventEmitter":12,"./Logger":13,"./errors":18}],9:[function(require,module,exports){
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.DataConsumer = void 0;
+const Logger_1 = require("./Logger");
+const EnhancedEventEmitter_1 = require("./EnhancedEventEmitter");
+const logger = new Logger_1.Logger('DataConsumer');
+class DataConsumer extends EnhancedEventEmitter_1.EnhancedEventEmitter {
+    /**
+     * @emits transportclose
+     * @emits open
+     * @emits error - (error: Error)
+     * @emits close
+     * @emits message - (message: any)
+     * @emits @close
+     */
+    constructor({ id, dataProducerId, dataChannel, sctpStreamParameters, appData }) {
+        super();
+        // Closed flag.
+        this._closed = false;
+        // Observer instance.
+        this._observer = new EnhancedEventEmitter_1.EnhancedEventEmitter();
+        logger.debug('constructor()');
+        this._id = id;
+        this._dataProducerId = dataProducerId;
+        this._dataChannel = dataChannel;
+        this._sctpStreamParameters = sctpStreamParameters;
+        this._appData = appData;
+        this._handleDataChannel();
+    }
+    /**
+     * DataConsumer id.
+     */
+    get id() {
+        return this._id;
+    }
+    /**
+     * Associated DataProducer id.
+     */
+    get dataProducerId() {
+        return this._dataProducerId;
+    }
+    /**
+     * Whether the DataConsumer is closed.
+     */
+    get closed() {
+        return this._closed;
+    }
+    /**
+     * SCTP stream parameters.
+     */
+    get sctpStreamParameters() {
+        return this._sctpStreamParameters;
+    }
+    /**
+     * DataChannel readyState.
+     */
+    get readyState() {
+        return this._dataChannel.readyState;
+    }
+    /**
+     * DataChannel label.
+     */
+    get label() {
+        return this._dataChannel.label;
+    }
+    /**
+     * DataChannel protocol.
+     */
+    get protocol() {
+        return this._dataChannel.protocol;
+    }
+    /**
+     * DataChannel binaryType.
+     */
+    get binaryType() {
+        return this._dataChannel.binaryType;
+    }
+    /**
+     * Set DataChannel binaryType.
+     */
+    set binaryType(binaryType) {
+        this._dataChannel.binaryType = binaryType;
+    }
+    /**
+     * App custom data.
+     */
+    get appData() {
+        return this._appData;
+    }
+    /**
+     * Invalid setter.
+     */
+    set appData(appData) {
+        throw new Error('cannot override appData object');
+    }
+    /**
+     * Observer.
+     *
+     * @emits close
+     */
+    get observer() {
+        return this._observer;
+    }
+    /**
+     * Closes the DataConsumer.
+     */
+    close() {
+        if (this._closed)
+            return;
+        logger.debug('close()');
+        this._closed = true;
+        this._dataChannel.close();
+        this.emit('@close');
+        // Emit observer event.
+        this._observer.safeEmit('close');
+    }
+    /**
+     * Transport was closed.
+     */
+    transportClosed() {
+        if (this._closed)
+            return;
+        logger.debug('transportClosed()');
+        this._closed = true;
+        this._dataChannel.close();
+        this.safeEmit('transportclose');
+        // Emit observer event.
+        this._observer.safeEmit('close');
+    }
+    _handleDataChannel() {
+        this._dataChannel.addEventListener('open', () => {
+            if (this._closed)
+                return;
+            logger.debug('DataChannel "open" event');
+            this.safeEmit('open');
+        });
+        this._dataChannel.addEventListener('error', (event) => {
+            if (this._closed)
+                return;
+            let { error } = event;
+            if (!error)
+                error = new Error('unknown DataChannel error');
+            if (error.errorDetail === 'sctp-failure') {
+                logger.error('DataChannel SCTP error [sctpCauseCode:%s]: %s', error.sctpCauseCode, error.message);
+            }
+            else {
+                logger.error('DataChannel "error" event: %o', error);
+            }
+            this.safeEmit('error', error);
+        });
+        this._dataChannel.addEventListener('close', () => {
+            if (this._closed)
+                return;
+            logger.warn('DataChannel "close" event');
+            this._closed = true;
+            this.emit('@close');
+            this.safeEmit('close');
+        });
+        this._dataChannel.addEventListener('message', (event) => {
+            if (this._closed)
+                return;
+            this.safeEmit('message', event.data);
+        });
+    }
+}
+exports.DataConsumer = DataConsumer;
+
+},{"./EnhancedEventEmitter":12,"./Logger":13}],10:[function(require,module,exports){
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.DataProducer = void 0;
+const Logger_1 = require("./Logger");
+const EnhancedEventEmitter_1 = require("./EnhancedEventEmitter");
+const errors_1 = require("./errors");
+const logger = new Logger_1.Logger('DataProducer');
+class DataProducer extends EnhancedEventEmitter_1.EnhancedEventEmitter {
+    /**
+     * @emits transportclose
+     * @emits open
+     * @emits error - (error: Error)
+     * @emits close
+     * @emits bufferedamountlow
+     * @emits @close
+     */
+    constructor({ id, dataChannel, sctpStreamParameters, appData }) {
+        super();
+        // Closed flag.
+        this._closed = false;
+        // Observer instance.
+        this._observer = new EnhancedEventEmitter_1.EnhancedEventEmitter();
+        logger.debug('constructor()');
+        this._id = id;
+        this._dataChannel = dataChannel;
+        this._sctpStreamParameters = sctpStreamParameters;
+        this._appData = appData;
+        this._handleDataChannel();
+    }
+    /**
+     * DataProducer id.
+     */
+    get id() {
+        return this._id;
+    }
+    /**
+     * Whether the DataProducer is closed.
+     */
+    get closed() {
+        return this._closed;
+    }
+    /**
+     * SCTP stream parameters.
+     */
+    get sctpStreamParameters() {
+        return this._sctpStreamParameters;
+    }
+    /**
+     * DataChannel readyState.
+     */
+    get readyState() {
+        return this._dataChannel.readyState;
+    }
+    /**
+     * DataChannel label.
+     */
+    get label() {
+        return this._dataChannel.label;
+    }
+    /**
+     * DataChannel protocol.
+     */
+    get protocol() {
+        return this._dataChannel.protocol;
+    }
+    /**
+     * DataChannel bufferedAmount.
+     */
+    get bufferedAmount() {
+        return this._dataChannel.bufferedAmount;
+    }
+    /**
+     * DataChannel bufferedAmountLowThreshold.
+     */
+    get bufferedAmountLowThreshold() {
+        return this._dataChannel.bufferedAmountLowThreshold;
+    }
+    /**
+     * Set DataChannel bufferedAmountLowThreshold.
+     */
+    set bufferedAmountLowThreshold(bufferedAmountLowThreshold) {
+        this._dataChannel.bufferedAmountLowThreshold = bufferedAmountLowThreshold;
+    }
+    /**
+     * App custom data.
+     */
+    get appData() {
+        return this._appData;
+    }
+    /**
+     * Invalid setter.
+     */
+    set appData(appData) {
+        throw new Error('cannot override appData object');
+    }
+    /**
+     * Observer.
+     *
+     * @emits close
+     */
+    get observer() {
+        return this._observer;
+    }
+    /**
+     * Closes the DataProducer.
+     */
+    close() {
+        if (this._closed)
+            return;
+        logger.debug('close()');
+        this._closed = true;
+        this._dataChannel.close();
+        this.emit('@close');
+        // Emit observer event.
+        this._observer.safeEmit('close');
+    }
+    /**
+     * Transport was closed.
+     */
+    transportClosed() {
+        if (this._closed)
+            return;
+        logger.debug('transportClosed()');
+        this._closed = true;
+        this._dataChannel.close();
+        this.safeEmit('transportclose');
+        // Emit observer event.
+        this._observer.safeEmit('close');
+    }
+    /**
+     * Send a message.
+     *
+     * @param {String|Blob|ArrayBuffer|ArrayBufferView} data.
+     */
+    send(data) {
+        logger.debug('send()');
+        if (this._closed)
+            throw new errors_1.InvalidStateError('closed');
+        this._dataChannel.send(data);
+    }
+    _handleDataChannel() {
+        this._dataChannel.addEventListener('open', () => {
+            if (this._closed)
+                return;
+            logger.debug('DataChannel "open" event');
+            this.safeEmit('open');
+        });
+        this._dataChannel.addEventListener('error', (event) => {
+            if (this._closed)
+                return;
+            let { error } = event;
+            if (!error)
+                error = new Error('unknown DataChannel error');
+            if (error.errorDetail === 'sctp-failure') {
+                logger.error('DataChannel SCTP error [sctpCauseCode:%s]: %s', error.sctpCauseCode, error.message);
+            }
+            else {
+                logger.error('DataChannel "error" event: %o', error);
+            }
+            this.safeEmit('error', error);
+        });
+        this._dataChannel.addEventListener('close', () => {
+            if (this._closed)
+                return;
+            logger.warn('DataChannel "close" event');
+            this._closed = true;
+            this.emit('@close');
+            this.safeEmit('close');
+        });
+        this._dataChannel.addEventListener('message', () => {
+            if (this._closed)
+                return;
+            logger.warn('DataChannel "message" event in a DataProducer, message discarded');
+        });
+        this._dataChannel.addEventListener('bufferedamountlow', () => {
+            if (this._closed)
+                return;
+            this.safeEmit('bufferedamountlow');
+        });
+    }
+}
+exports.DataProducer = DataProducer;
+
+},{"./EnhancedEventEmitter":12,"./Logger":13,"./errors":18}],11:[function(require,module,exports){
+"use strict";
+/* global RTCRtpTransceiver */
+var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
+}) : (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    o[k2] = m[k];
+}));
+var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
+    Object.defineProperty(o, "default", { enumerable: true, value: v });
+}) : function(o, v) {
+    o["default"] = v;
+});
+var __importStar = (this && this.__importStar) || function (mod) {
+    if (mod && mod.__esModule) return mod;
+    var result = {};
+    if (mod != null) for (var k in mod) if (k !== "default" && Object.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
+    __setModuleDefault(result, mod);
+    return result;
+};
+var __importDefault = (this && this.__importDefault) || function (mod) {
+    return (mod && mod.__esModule) ? mod : { "default": mod };
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.Device = exports.detectDevice = void 0;
+const bowser_1 = __importDefault(require("bowser"));
+const Logger_1 = require("./Logger");
+const EnhancedEventEmitter_1 = require("./EnhancedEventEmitter");
+const errors_1 = require("./errors");
+const utils = __importStar(require("./utils"));
+const ortc = __importStar(require("./ortc"));
+const Transport_1 = require("./Transport");
+const Chrome74_1 = require("./handlers/Chrome74");
+const Chrome70_1 = require("./handlers/Chrome70");
+const Chrome67_1 = require("./handlers/Chrome67");
+const Chrome55_1 = require("./handlers/Chrome55");
+const Firefox60_1 = require("./handlers/Firefox60");
+const Safari12_1 = require("./handlers/Safari12");
+const Safari11_1 = require("./handlers/Safari11");
+const Edge11_1 = require("./handlers/Edge11");
+const ReactNative_1 = require("./handlers/ReactNative");
+const logger = new Logger_1.Logger('Device');
+function detectDevice() {
+    // React-Native.
+    // NOTE: react-native-webrtc >= 1.75.0 is required.
+    if (typeof navigator === 'object' && navigator.product === 'ReactNative') {
+        if (typeof RTCPeerConnection === 'undefined') {
+            logger.warn('this._detectDevice() | unsupported ReactNative without RTCPeerConnection');
+            return undefined;
+        }
+        logger.debug('this._detectDevice() | ReactNative handler chosen');
+        return 'ReactNative';
+    }
+    // Browser.
+    else if (typeof navigator === 'object' && typeof navigator.userAgent === 'string') {
+        const ua = navigator.userAgent;
+        const browser = bowser_1.default.getParser(ua);
+        const engine = browser.getEngine();
+        // Chrome and Chromium.
+        if (browser.satisfies({ chrome: '>=74', chromium: '>=74' })) {
+            return 'Chrome74';
+        }
+        else if (browser.satisfies({ chrome: '>=70', chromium: '>=70' })) {
+            return 'Chrome70';
+        }
+        else if (browser.satisfies({ chrome: '>=67', chromium: '>=67' })) {
+            return 'Chrome67';
+        }
+        else if (browser.satisfies({ chrome: '>=55', chromium: '>=55' })) {
+            return 'Chrome55';
+        }
+        // Firefox.
+        else if (browser.satisfies({ firefox: '>=60' })) {
+            return 'Firefox60';
+        }
+        // Safari with Unified-Plan support enabled.
+        else if (browser.satisfies({ safari: '>=12.0' }) &&
+            typeof RTCRtpTransceiver !== 'undefined' &&
+            RTCRtpTransceiver.prototype.hasOwnProperty('currentDirection')) {
+            return 'Safari12';
+        }
+        // Safari with Plab-B support.
+        else if (browser.satisfies({ safari: '>=11' })) {
+            return 'Safari11';
+        }
+        // Old Edge with ORTC support.
+        else if (browser.satisfies({ 'microsoft edge': '>=11' }) &&
+            browser.satisfies({ 'microsoft edge': '<=18' })) {
+            return 'Edge11';
+        }
+        // Best effort for Chromium based browsers.
+        else if (engine.name && engine.name.toLowerCase() === 'blink') {
+            const match = ua.match(/(?:(?:Chrome|Chromium))[ /](\w+)/i);
+            if (match) {
+                const version = Number(match[1]);
+                if (version >= 74) {
+                    return 'Chrome74';
                 }
-
-                // Compare H264 levels and handle the level 1b case.
-                function isLessLevel(a, b) {
-                    if (a === Level1_b) return b !== Level1 && b !== Level1_b;
-
-                    if (b === Level1_b) return a !== Level1;
-
-                    return a < b;
+                else if (version >= 70) {
+                    return 'Chrome70';
                 }
-
-                function minLevel(a, b) {
-                    return isLessLevel(a, b) ? a : b;
+                else if (version >= 67) {
+                    return 'Chrome67';
                 }
-
-                function isLevelAsymmetryAllowed(params = {}) {
-                    const level_asymmetry_allowed = params['level-asymmetry-allowed'];
-
-                    return level_asymmetry_allowed === 1 || level_asymmetry_allowed === '1';
+                else {
+                    return 'Chrome55';
                 }
-            },
-            { debug: 4 },
-        ],
-        4: [
-            function (require, module, exports) {
-                (function (process) {
-                    /* eslint-env browser */
-
-                    /**
-                     * This is the web browser implementation of `debug()`.
-                     */
-
-                    exports.log = log;
-                    exports.formatArgs = formatArgs;
-                    exports.save = save;
-                    exports.load = load;
-                    exports.useColors = useColors;
-                    exports.storage = localstorage();
-
-                    /**
-                     * Colors.
-                     */
-
-                    exports.colors = [
-                        '#0000CC',
-                        '#0000FF',
-                        '#0033CC',
-                        '#0033FF',
-                        '#0066CC',
-                        '#0066FF',
-                        '#0099CC',
-                        '#0099FF',
-                        '#00CC00',
-                        '#00CC33',
-                        '#00CC66',
-                        '#00CC99',
-                        '#00CCCC',
-                        '#00CCFF',
-                        '#3300CC',
-                        '#3300FF',
-                        '#3333CC',
-                        '#3333FF',
-                        '#3366CC',
-                        '#3366FF',
-                        '#3399CC',
-                        '#3399FF',
-                        '#33CC00',
-                        '#33CC33',
-                        '#33CC66',
-                        '#33CC99',
-                        '#33CCCC',
-                        '#33CCFF',
-                        '#6600CC',
-                        '#6600FF',
-                        '#6633CC',
-                        '#6633FF',
-                        '#66CC00',
-                        '#66CC33',
-                        '#9900CC',
-                        '#9900FF',
-                        '#9933CC',
-                        '#9933FF',
-                        '#99CC00',
-                        '#99CC33',
-                        '#CC0000',
-                        '#CC0033',
-                        '#CC0066',
-                        '#CC0099',
-                        '#CC00CC',
-                        '#CC00FF',
-                        '#CC3300',
-                        '#CC3333',
-                        '#CC3366',
-                        '#CC3399',
-                        '#CC33CC',
-                        '#CC33FF',
-                        '#CC6600',
-                        '#CC6633',
-                        '#CC9900',
-                        '#CC9933',
-                        '#CCCC00',
-                        '#CCCC33',
-                        '#FF0000',
-                        '#FF0033',
-                        '#FF0066',
-                        '#FF0099',
-                        '#FF00CC',
-                        '#FF00FF',
-                        '#FF3300',
-                        '#FF3333',
-                        '#FF3366',
-                        '#FF3399',
-                        '#FF33CC',
-                        '#FF33FF',
-                        '#FF6600',
-                        '#FF6633',
-                        '#FF9900',
-                        '#FF9933',
-                        '#FFCC00',
-                        '#FFCC33',
-                    ];
-
-                    /**
-                     * Currently only WebKit-based Web Inspectors, Firefox >= v31,
-                     * and the Firebug extension (any Firefox version) are known
-                     * to support "%c" CSS customizations.
-                     *
-                     * TODO: add a `localStorage` variable to explicitly enable/disable colors
-                     */
-
-                    // eslint-disable-next-line complexity
-                    function useColors() {
-                        // NB: In an Electron preload script, document will be defined but not fully
-                        // initialized. Since we know we're in Chrome, we'll just detect this case
-                        // explicitly
-                        if (
-                            typeof window !== 'undefined' &&
-                            window.process &&
-                            (window.process.type === 'renderer' || window.process.__nwjs)
-                        ) {
-                            return true;
-                        }
-
-                        // Internet Explorer and Edge do not support colors.
-                        if (
-                            typeof navigator !== 'undefined' &&
-                            navigator.userAgent &&
-                            navigator.userAgent.toLowerCase().match(/(edge|trident)\/(\d+)/)
-                        ) {
-                            return false;
-                        }
-
-                        // Is webkit? http://stackoverflow.com/a/16459606/376773
-                        // document is undefined in react-native: https://github.com/facebook/react-native/pull/1632
-                        return (
-                            (typeof document !== 'undefined' &&
-                                document.documentElement &&
-                                document.documentElement.style &&
-                                document.documentElement.style.WebkitAppearance) ||
-                            // Is firebug? http://stackoverflow.com/a/398120/376773
-                            (typeof window !== 'undefined' &&
-                                window.console &&
-                                (window.console.firebug || (window.console.exception && window.console.table))) ||
-                            // Is firefox >= v31?
-                            // https://developer.mozilla.org/en-US/docs/Tools/Web_Console#Styling_messages
-                            (typeof navigator !== 'undefined' &&
-                                navigator.userAgent &&
-                                navigator.userAgent.toLowerCase().match(/firefox\/(\d+)/) &&
-                                parseInt(RegExp.$1, 10) >= 31) ||
-                            // Double check webkit in userAgent just in case we are in a worker
-                            (typeof navigator !== 'undefined' &&
-                                navigator.userAgent &&
-                                navigator.userAgent.toLowerCase().match(/applewebkit\/(\d+)/))
-                        );
-                    }
-
-                    /**
-                     * Colorize log arguments if enabled.
-                     *
-                     * @api public
-                     */
-
-                    function formatArgs(args) {
-                        args[0] =
-                            (this.useColors ? '%c' : '') +
-                            this.namespace +
-                            (this.useColors ? ' %c' : ' ') +
-                            args[0] +
-                            (this.useColors ? '%c ' : ' ') +
-                            '+' +
-                            module.exports.humanize(this.diff);
-
-                        if (!this.useColors) {
-                            return;
-                        }
-
-                        const c = 'color: ' + this.color;
-                        args.splice(1, 0, c, 'color: inherit');
-
-                        // The final "%c" is somewhat tricky, because there could be other
-                        // arguments passed either before or after the %c, so we need to
-                        // figure out the correct index to insert the CSS into
-                        let index = 0;
-                        let lastC = 0;
-                        args[0].replace(/%[a-zA-Z%]/g, (match) => {
-                            if (match === '%%') {
-                                return;
-                            }
-                            index++;
-                            if (match === '%c') {
-                                // We only are interested in the *last* %c
-                                // (the user may have provided their own)
-                                lastC = index;
-                            }
-                        });
-
-                        args.splice(lastC, 0, c);
-                    }
-
-                    /**
-                     * Invokes `console.log()` when available.
-                     * No-op when `console.log` is not a "function".
-                     *
-                     * @api public
-                     */
-                    function log(...args) {
-                        // This hackery is required for IE8/9, where
-                        // the `console.log` function doesn't have 'apply'
-                        return typeof console === 'object' && console.log && console.log(...args);
-                    }
-
-                    /**
-                     * Save `namespaces`.
-                     *
-                     * @param {String} namespaces
-                     * @api private
-                     */
-                    function save(namespaces) {
-                        try {
-                            if (namespaces) {
-                                exports.storage.setItem('debug', namespaces);
-                            } else {
-                                exports.storage.removeItem('debug');
-                            }
-                        } catch (error) {
-                            // Swallow
-                            // XXX (@Qix-) should we be logging these?
-                        }
-                    }
-
-                    /**
-                     * Load `namespaces`.
-                     *
-                     * @return {String} returns the previously persisted debug modes
-                     * @api private
-                     */
-                    function load() {
-                        let r;
-                        try {
-                            r = exports.storage.getItem('debug');
-                        } catch (error) {
-                            // Swallow
-                            // XXX (@Qix-) should we be logging these?
-                        }
-
-                        // If debug isn't set in LS, and we're in Electron, try to load $DEBUG
-                        if (!r && typeof process !== 'undefined' && 'env' in process) {
-                            r = process.env.DEBUG;
-                        }
-
-                        return r;
-                    }
-
-                    /**
-                     * Localstorage attempts to return the localstorage.
-                     *
-                     * This is necessary because safari throws
-                     * when a user disables cookies/localstorage
-                     * and you attempt to access it.
-                     *
-                     * @return {LocalStorage}
-                     * @api private
-                     */
-
-                    function localstorage() {
-                        try {
-                            // TVMLKit (Apple TV JS Runtime) does not have a window object, just localStorage in the global context
-                            // The Browser also has localStorage in the global context.
-                            return localStorage;
-                        } catch (error) {
-                            // Swallow
-                            // XXX (@Qix-) should we be logging these?
-                        }
-                    }
-
-                    module.exports = require('./common')(exports);
-
-                    const { formatters } = module.exports;
-
-                    /**
-                     * Map %j to `JSON.stringify()`, since no Web Inspectors do that by default.
-                     */
-
-                    formatters.j = function (v) {
-                        try {
-                            return JSON.stringify(v);
-                        } catch (error) {
-                            return '[UnexpectedJSONParseError]: ' + error.message;
-                        }
-                    };
-                }.call(this, require('_process')));
-            },
-            { './common': 5, _process: 46 },
-        ],
-        5: [
-            function (require, module, exports) {
-                /**
-                 * This is the common logic for both the Node.js and web browser
-                 * implementations of `debug()`.
-                 */
-
-                function setup(env) {
-                    createDebug.debug = createDebug;
-                    createDebug.default = createDebug;
-                    createDebug.coerce = coerce;
-                    createDebug.disable = disable;
-                    createDebug.enable = enable;
-                    createDebug.enabled = enabled;
-                    createDebug.humanize = require('ms');
-
-                    Object.keys(env).forEach((key) => {
-                        createDebug[key] = env[key];
-                    });
-
-                    /**
-                     * Active `debug` instances.
-                     */
-                    createDebug.instances = [];
-
-                    /**
-                     * The currently active debug mode names, and names to skip.
-                     */
-
-                    createDebug.names = [];
-                    createDebug.skips = [];
-
-                    /**
-                     * Map of special "%n" handling functions, for the debug "format" argument.
-                     *
-                     * Valid key names are a single, lower or upper-case letter, i.e. "n" and "N".
-                     */
-                    createDebug.formatters = {};
-
-                    /**
-                     * Selects a color for a debug namespace
-                     * @param {String} namespace The namespace string for the for the debug instance to be colored
-                     * @return {Number|String} An ANSI color code for the given namespace
-                     * @api private
-                     */
-                    function selectColor(namespace) {
-                        let hash = 0;
-
-                        for (let i = 0; i < namespace.length; i++) {
-                            hash = (hash << 5) - hash + namespace.charCodeAt(i);
-                            hash |= 0; // Convert to 32bit integer
-                        }
-
-                        return createDebug.colors[Math.abs(hash) % createDebug.colors.length];
-                    }
-                    createDebug.selectColor = selectColor;
-
-                    /**
-                     * Create a debugger with the given `namespace`.
-                     *
-                     * @param {String} namespace
-                     * @return {Function}
-                     * @api public
-                     */
-                    function createDebug(namespace) {
-                        let prevTime;
-
-                        function debug(...args) {
-                            // Disabled?
-                            if (!debug.enabled) {
-                                return;
-                            }
-
-                            const self = debug;
-
-                            // Set `diff` timestamp
-                            const curr = Number(new Date());
-                            const ms = curr - (prevTime || curr);
-                            self.diff = ms;
-                            self.prev = prevTime;
-                            self.curr = curr;
-                            prevTime = curr;
-
-                            args[0] = createDebug.coerce(args[0]);
-
-                            if (typeof args[0] !== 'string') {
-                                // Anything else let's inspect with %O
-                                args.unshift('%O');
-                            }
-
-                            // Apply any `formatters` transformations
-                            let index = 0;
-                            args[0] = args[0].replace(/%([a-zA-Z%])/g, (match, format) => {
-                                // If we encounter an escaped % then don't increase the array index
-                                if (match === '%%') {
-                                    return match;
-                                }
-                                index++;
-                                const formatter = createDebug.formatters[format];
-                                if (typeof formatter === 'function') {
-                                    const val = args[index];
-                                    match = formatter.call(self, val);
-
-                                    // Now we need to remove `args[index]` since it's inlined in the `format`
-                                    args.splice(index, 1);
-                                    index--;
-                                }
-                                return match;
-                            });
-
-                            // Apply env-specific formatting (colors, etc.)
-                            createDebug.formatArgs.call(self, args);
-
-                            const logFn = self.log || createDebug.log;
-                            logFn.apply(self, args);
-                        }
-
-                        debug.namespace = namespace;
-                        debug.enabled = createDebug.enabled(namespace);
-                        debug.useColors = createDebug.useColors();
-                        debug.color = selectColor(namespace);
-                        debug.destroy = destroy;
-                        debug.extend = extend;
-                        // Debug.formatArgs = formatArgs;
-                        // debug.rawLog = rawLog;
-
-                        // env-specific initialization logic for debug instances
-                        if (typeof createDebug.init === 'function') {
-                            createDebug.init(debug);
-                        }
-
-                        createDebug.instances.push(debug);
-
-                        return debug;
-                    }
-
-                    function destroy() {
-                        const index = createDebug.instances.indexOf(this);
-                        if (index !== -1) {
-                            createDebug.instances.splice(index, 1);
-                            return true;
-                        }
-                        return false;
-                    }
-
-                    function extend(namespace, delimiter) {
-                        const newDebug = createDebug(
-                            this.namespace + (typeof delimiter === 'undefined' ? ':' : delimiter) + namespace,
-                        );
-                        newDebug.log = this.log;
-                        return newDebug;
-                    }
-
-                    /**
-                     * Enables a debug mode by namespaces. This can include modes
-                     * separated by a colon and wildcards.
-                     *
-                     * @param {String} namespaces
-                     * @api public
-                     */
-                    function enable(namespaces) {
-                        createDebug.save(namespaces);
-
-                        createDebug.names = [];
-                        createDebug.skips = [];
-
-                        let i;
-                        const split = (typeof namespaces === 'string' ? namespaces : '').split(/[\s,]+/);
-                        const len = split.length;
-
-                        for (i = 0; i < len; i++) {
-                            if (!split[i]) {
-                                // ignore empty strings
-                                continue;
-                            }
-
-                            namespaces = split[i].replace(/\*/g, '.*?');
-
-                            if (namespaces[0] === '-') {
-                                createDebug.skips.push(new RegExp('^' + namespaces.substr(1) + '$'));
-                            } else {
-                                createDebug.names.push(new RegExp('^' + namespaces + '$'));
-                            }
-                        }
-
-                        for (i = 0; i < createDebug.instances.length; i++) {
-                            const instance = createDebug.instances[i];
-                            instance.enabled = createDebug.enabled(instance.namespace);
-                        }
-                    }
-
-                    /**
-                     * Disable debug output.
-                     *
-                     * @return {String} namespaces
-                     * @api public
-                     */
-                    function disable() {
-                        const namespaces = [
-                            ...createDebug.names.map(toNamespace),
-                            ...createDebug.skips.map(toNamespace).map((namespace) => '-' + namespace),
-                        ].join(',');
-                        createDebug.enable('');
-                        return namespaces;
-                    }
-
-                    /**
-                     * Returns true if the given mode name is enabled, false otherwise.
-                     *
-                     * @param {String} name
-                     * @return {Boolean}
-                     * @api public
-                     */
-                    function enabled(name) {
-                        if (name[name.length - 1] === '*') {
-                            return true;
-                        }
-
-                        let i;
-                        let len;
-
-                        for (i = 0, len = createDebug.skips.length; i < len; i++) {
-                            if (createDebug.skips[i].test(name)) {
-                                return false;
-                            }
-                        }
-
-                        for (i = 0, len = createDebug.names.length; i < len; i++) {
-                            if (createDebug.names[i].test(name)) {
-                                return true;
-                            }
-                        }
-
-                        return false;
-                    }
-
-                    /**
-                     * Convert regexp to namespace
-                     *
-                     * @param {RegExp} regxep
-                     * @return {String} namespace
-                     * @api private
-                     */
-                    function toNamespace(regexp) {
-                        return regexp
-                            .toString()
-                            .substring(2, regexp.toString().length - 2)
-                            .replace(/\.\*\?$/, '*');
-                    }
-
-                    /**
-                     * Coerce `val`.
-                     *
-                     * @param {Mixed} val
-                     * @return {Mixed}
-                     * @api private
-                     */
-                    function coerce(val) {
-                        if (val instanceof Error) {
-                            return val.stack || val.message;
-                        }
-                        return val;
-                    }
-
-                    createDebug.enable(createDebug.load());
-
-                    return createDebug;
-                }
-
-                module.exports = setup;
-            },
-            { ms: 6 },
-        ],
-        6: [
-            function (require, module, exports) {
-                /**
-                 * Helpers.
-                 */
-
-                var s = 1000;
-                var m = s * 60;
-                var h = m * 60;
-                var d = h * 24;
-                var w = d * 7;
-                var y = d * 365.25;
-
-                /**
-                 * Parse or format the given `val`.
-                 *
-                 * Options:
-                 *
-                 *  - `long` verbose formatting [false]
-                 *
-                 * @param {String|Number} val
-                 * @param {Object} [options]
-                 * @throws {Error} throw an error if val is not a non-empty string or a number
-                 * @return {String|Number}
-                 * @api public
-                 */
-
-                module.exports = function (val, options) {
-                    options = options || {};
-                    var type = typeof val;
-                    if (type === 'string' && val.length > 0) {
-                        return parse(val);
-                    } else if (type === 'number' && isFinite(val)) {
-                        return options.long ? fmtLong(val) : fmtShort(val);
-                    }
-                    throw new Error('val is not a non-empty string or a valid number. val=' + JSON.stringify(val));
-                };
-
-                /**
-                 * Parse the given `str` and return milliseconds.
-                 *
-                 * @param {String} str
-                 * @return {Number}
-                 * @api private
-                 */
-
-                function parse(str) {
-                    str = String(str);
-                    if (str.length > 100) {
-                        return;
-                    }
-                    var match =
-                        /^(-?(?:\d+)?\.?\d+) *(milliseconds?|msecs?|ms|seconds?|secs?|s|minutes?|mins?|m|hours?|hrs?|h|days?|d|weeks?|w|years?|yrs?|y)?$/i.exec(
-                            str,
-                        );
-                    if (!match) {
-                        return;
-                    }
-                    var n = parseFloat(match[1]);
-                    var type = (match[2] || 'ms').toLowerCase();
-                    switch (type) {
-                        case 'years':
-                        case 'year':
-                        case 'yrs':
-                        case 'yr':
-                        case 'y':
-                            return n * y;
-                        case 'weeks':
-                        case 'week':
-                        case 'w':
-                            return n * w;
-                        case 'days':
-                        case 'day':
-                        case 'd':
-                            return n * d;
-                        case 'hours':
-                        case 'hour':
-                        case 'hrs':
-                        case 'hr':
-                        case 'h':
-                            return n * h;
-                        case 'minutes':
-                        case 'minute':
-                        case 'mins':
-                        case 'min':
-                        case 'm':
-                            return n * m;
-                        case 'seconds':
-                        case 'second':
-                        case 'secs':
-                        case 'sec':
-                        case 's':
-                            return n * s;
-                        case 'milliseconds':
-                        case 'millisecond':
-                        case 'msecs':
-                        case 'msec':
-                        case 'ms':
-                            return n;
-                        default:
-                            return undefined;
-                    }
-                }
-
-                /**
-                 * Short format for `ms`.
-                 *
-                 * @param {Number} ms
-                 * @return {String}
-                 * @api private
-                 */
-
-                function fmtShort(ms) {
-                    var msAbs = Math.abs(ms);
-                    if (msAbs >= d) {
-                        return Math.round(ms / d) + 'd';
-                    }
-                    if (msAbs >= h) {
-                        return Math.round(ms / h) + 'h';
-                    }
-                    if (msAbs >= m) {
-                        return Math.round(ms / m) + 'm';
-                    }
-                    if (msAbs >= s) {
-                        return Math.round(ms / s) + 's';
-                    }
-                    return ms + 'ms';
-                }
-
-                /**
-                 * Long format for `ms`.
-                 *
-                 * @param {Number} ms
-                 * @return {String}
-                 * @api private
-                 */
-
-                function fmtLong(ms) {
-                    var msAbs = Math.abs(ms);
-                    if (msAbs >= d) {
-                        return plural(ms, msAbs, d, 'day');
-                    }
-                    if (msAbs >= h) {
-                        return plural(ms, msAbs, h, 'hour');
-                    }
-                    if (msAbs >= m) {
-                        return plural(ms, msAbs, m, 'minute');
-                    }
-                    if (msAbs >= s) {
-                        return plural(ms, msAbs, s, 'second');
-                    }
-                    return ms + ' ms';
+            }
+            else {
+                return 'Chrome74';
+            }
+        }
+        // Unsupported browser.
+        else {
+            logger.warn('this._detectDevice() | browser not supported [name:%s, version:%s]', browser.getBrowserName(), browser.getBrowserVersion());
+            return undefined;
+        }
+    }
+    // Unknown device.
+    else {
+        logger.warn('this._detectDevice() | unknown device');
+        return undefined;
+    }
+}
+exports.detectDevice = detectDevice;
+class Device {
+    /**
+     * Create a new Device to connect to mediasoup server.
+     *
+     * @throws {UnsupportedError} if device is not supported.
+     */
+    constructor({ handlerName, handlerFactory, Handler } = {}) {
+        // Loaded flag.
+        this._loaded = false;
+        // Observer instance.
+        this._observer = new EnhancedEventEmitter_1.EnhancedEventEmitter();
+        logger.debug('constructor()');
+        // Handle deprecated option.
+        if (Handler) {
+            logger.warn('constructor() | Handler option is DEPRECATED, use handlerName or handlerFactory instead');
+            if (typeof Handler === 'string')
+                handlerName = Handler;
+            else
+                throw new TypeError('non string Handler option no longer supported, use handlerFactory instead');
+        }
+        if (handlerName && handlerFactory) {
+            throw new TypeError('just one of handlerName or handlerInterface can be given');
+        }
+        if (handlerFactory) {
+            this._handlerFactory = handlerFactory;
+        }
+        else {
+            if (handlerName) {
+                logger.debug('constructor() | handler given: %s', handlerName);
+            }
+            else {
+                handlerName = detectDevice();
+                if (handlerName)
+                    logger.debug('constructor() | detected handler: %s', handlerName);
+                else
+                    throw new errors_1.UnsupportedError('device not supported');
+            }
+            switch (handlerName) {
+                case 'Chrome74':
+                    this._handlerFactory = Chrome74_1.Chrome74.createFactory();
+                    break;
+                case 'Chrome70':
+                    this._handlerFactory = Chrome70_1.Chrome70.createFactory();
+                    break;
+                case 'Chrome67':
+                    this._handlerFactory = Chrome67_1.Chrome67.createFactory();
+                    break;
+                case 'Chrome55':
+                    this._handlerFactory = Chrome55_1.Chrome55.createFactory();
+                    break;
+                case 'Firefox60':
+                    this._handlerFactory = Firefox60_1.Firefox60.createFactory();
+                    break;
+                case 'Safari12':
+                    this._handlerFactory = Safari12_1.Safari12.createFactory();
+                    break;
+                case 'Safari11':
+                    this._handlerFactory = Safari11_1.Safari11.createFactory();
+                    break;
+                case 'Edge11':
+                    this._handlerFactory = Edge11_1.Edge11.createFactory();
+                    break;
+                case 'ReactNative':
+                    this._handlerFactory = ReactNative_1.ReactNative.createFactory();
+                    break;
+                default:
+                    throw new TypeError(`unknown handlerName "${handlerName}"`);
+            }
+        }
+        // Create a temporal handler to get its name.
+        const handler = this._handlerFactory();
+        this._handlerName = handler.name;
+        handler.close();
+        this._extendedRtpCapabilities = undefined;
+        this._recvRtpCapabilities = undefined;
+        this._canProduceByKind =
+            {
+                audio: false,
+                video: false
+            };
+        this._sctpCapabilities = undefined;
+    }
+    /**
+     * The RTC handler name.
+     */
+    get handlerName() {
+        return this._handlerName;
+    }
+    /**
+     * Whether the Device is loaded.
+     */
+    get loaded() {
+        return this._loaded;
+    }
+    /**
+     * RTP capabilities of the Device for receiving media.
+     *
+     * @throws {InvalidStateError} if not loaded.
+     */
+    get rtpCapabilities() {
+        if (!this._loaded)
+            throw new errors_1.InvalidStateError('not loaded');
+        return this._recvRtpCapabilities;
+    }
+    /**
+     * SCTP capabilities of the Device.
+     *
+     * @throws {InvalidStateError} if not loaded.
+     */
+    get sctpCapabilities() {
+        if (!this._loaded)
+            throw new errors_1.InvalidStateError('not loaded');
+        return this._sctpCapabilities;
+    }
+    /**
+     * Observer.
+     *
+     * @emits newtransport - (transport: Transport)
+     */
+    get observer() {
+        return this._observer;
+    }
+    /**
+     * Initialize the Device.
+     */
+    async load({ routerRtpCapabilities }) {
+        logger.debug('load() [routerRtpCapabilities:%o]', routerRtpCapabilities);
+        routerRtpCapabilities = utils.clone(routerRtpCapabilities, undefined);
+        // Temporal handler to get its capabilities.
+        let handler;
+        try {
+            if (this._loaded)
+                throw new errors_1.InvalidStateError('already loaded');
+            // This may throw.
+            ortc.validateRtpCapabilities(routerRtpCapabilities);
+            handler = this._handlerFactory();
+            const nativeRtpCapabilities = await handler.getNativeRtpCapabilities();
+            logger.debug('load() | got native RTP capabilities:%o', nativeRtpCapabilities);
+            // This may throw.
+            ortc.validateRtpCapabilities(nativeRtpCapabilities);
+            // Get extended RTP capabilities.
+            this._extendedRtpCapabilities = ortc.getExtendedRtpCapabilities(nativeRtpCapabilities, routerRtpCapabilities);
+            logger.debug('load() | got extended RTP capabilities:%o', this._extendedRtpCapabilities);
+            // Check whether we can produce audio/video.
+            this._canProduceByKind.audio =
+                ortc.canSend('audio', this._extendedRtpCapabilities);
+            this._canProduceByKind.video =
+                ortc.canSend('video', this._extendedRtpCapabilities);
+            // Generate our receiving RTP capabilities for receiving media.
+            this._recvRtpCapabilities =
+                ortc.getRecvRtpCapabilities(this._extendedRtpCapabilities);
+            // This may throw.
+            ortc.validateRtpCapabilities(this._recvRtpCapabilities);
+            logger.debug('load() | got receiving RTP capabilities:%o', this._recvRtpCapabilities);
+            // Generate our SCTP capabilities.
+            this._sctpCapabilities = await handler.getNativeSctpCapabilities();
+            logger.debug('load() | got native SCTP capabilities:%o', this._sctpCapabilities);
+            // This may throw.
+            ortc.validateSctpCapabilities(this._sctpCapabilities);
+            logger.debug('load() succeeded');
+            this._loaded = true;
+            handler.close();
+        }
+        catch (error) {
+            if (handler)
+                handler.close();
+            throw error;
+        }
+    }
+    /**
+     * Whether we can produce audio/video.
+     *
+     * @throws {InvalidStateError} if not loaded.
+     * @throws {TypeError} if wrong arguments.
+     */
+    canProduce(kind) {
+        if (!this._loaded)
+            throw new errors_1.InvalidStateError('not loaded');
+        else if (kind !== 'audio' && kind !== 'video')
+            throw new TypeError(`invalid kind "${kind}"`);
+        return this._canProduceByKind[kind];
+    }
+    /**
+     * Creates a Transport for sending media.
+     *
+     * @throws {InvalidStateError} if not loaded.
+     * @throws {TypeError} if wrong arguments.
+     */
+    createSendTransport({ id, iceParameters, iceCandidates, dtlsParameters, sctpParameters, iceServers, iceTransportPolicy, additionalSettings, proprietaryConstraints, appData = {} }) {
+        logger.debug('createSendTransport()');
+        return this._createTransport({
+            direction: 'send',
+            id: id,
+            iceParameters: iceParameters,
+            iceCandidates: iceCandidates,
+            dtlsParameters: dtlsParameters,
+            sctpParameters: sctpParameters,
+            iceServers: iceServers,
+            iceTransportPolicy: iceTransportPolicy,
+            additionalSettings: additionalSettings,
+            proprietaryConstraints: proprietaryConstraints,
+            appData: appData
+        });
+    }
+    /**
+     * Creates a Transport for receiving media.
+     *
+     * @throws {InvalidStateError} if not loaded.
+     * @throws {TypeError} if wrong arguments.
+     */
+    createRecvTransport({ id, iceParameters, iceCandidates, dtlsParameters, sctpParameters, iceServers, iceTransportPolicy, additionalSettings, proprietaryConstraints, appData = {} }) {
+        logger.debug('createRecvTransport()');
+        return this._createTransport({
+            direction: 'recv',
+            id: id,
+            iceParameters: iceParameters,
+            iceCandidates: iceCandidates,
+            dtlsParameters: dtlsParameters,
+            sctpParameters: sctpParameters,
+            iceServers: iceServers,
+            iceTransportPolicy: iceTransportPolicy,
+            additionalSettings: additionalSettings,
+            proprietaryConstraints: proprietaryConstraints,
+            appData: appData
+        });
+    }
+    _createTransport({ direction, id, iceParameters, iceCandidates, dtlsParameters, sctpParameters, iceServers, iceTransportPolicy, additionalSettings, proprietaryConstraints, appData = {} }) {
+        if (!this._loaded)
+            throw new errors_1.InvalidStateError('not loaded');
+        else if (typeof id !== 'string')
+            throw new TypeError('missing id');
+        else if (typeof iceParameters !== 'object')
+            throw new TypeError('missing iceParameters');
+        else if (!Array.isArray(iceCandidates))
+            throw new TypeError('missing iceCandidates');
+        else if (typeof dtlsParameters !== 'object')
+            throw new TypeError('missing dtlsParameters');
+        else if (sctpParameters && typeof sctpParameters !== 'object')
+            throw new TypeError('wrong sctpParameters');
+        else if (appData && typeof appData !== 'object')
+            throw new TypeError('if given, appData must be an object');
+        // Create a new Transport.
+        const transport = new Transport_1.Transport({
+            direction,
+            id,
+            iceParameters,
+            iceCandidates,
+            dtlsParameters,
+            sctpParameters,
+            iceServers,
+            iceTransportPolicy,
+            additionalSettings,
+            proprietaryConstraints,
+            appData,
+            handlerFactory: this._handlerFactory,
+            extendedRtpCapabilities: this._extendedRtpCapabilities,
+            canProduceByKind: this._canProduceByKind
+        });
+        // Emit observer event.
+        this._observer.safeEmit('newtransport', transport);
+        return transport;
+    }
+}
+exports.Device = Device;
+
+},{"./EnhancedEventEmitter":12,"./Logger":13,"./Transport":17,"./errors":18,"./handlers/Chrome55":19,"./handlers/Chrome67":20,"./handlers/Chrome70":21,"./handlers/Chrome74":22,"./handlers/Edge11":23,"./handlers/Firefox60":24,"./handlers/ReactNative":26,"./handlers/Safari11":27,"./handlers/Safari12":28,"./ortc":36,"./utils":39,"bowser":3}],12:[function(require,module,exports){
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.EnhancedEventEmitter = void 0;
+const events_1 = require("events");
+const Logger_1 = require("./Logger");
+const logger = new Logger_1.Logger('EnhancedEventEmitter');
+class EnhancedEventEmitter extends events_1.EventEmitter {
+    constructor() {
+        super();
+        this.setMaxListeners(Infinity);
+    }
+    safeEmit(event, ...args) {
+        const numListeners = this.listenerCount(event);
+        try {
+            return this.emit(event, ...args);
+        }
+        catch (error) {
+            logger.error('safeEmit() | event listener threw an error [event:%s]:%o', event, error);
+            return Boolean(numListeners);
+        }
+    }
+    async safeEmitAsPromise(event, ...args) {
+        return new Promise((resolve, reject) => {
+            try {
+                this.emit(event, ...args, resolve, reject);
+            }
+            catch (error) {
+                logger.error('safeEmitAsPromise() | event listener threw an error [event:%s]:%o', event, error);
+                reject(error);
+            }
+        });
+    }
+}
+exports.EnhancedEventEmitter = EnhancedEventEmitter;
+
+},{"./Logger":13,"events":47}],13:[function(require,module,exports){
+"use strict";
+var __importDefault = (this && this.__importDefault) || function (mod) {
+    return (mod && mod.__esModule) ? mod : { "default": mod };
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.Logger = void 0;
+const debug_1 = __importDefault(require("debug"));
+const APP_NAME = 'mediasoup-client';
+class Logger {
+    constructor(prefix) {
+        if (prefix) {
+            this._debug = debug_1.default(`${APP_NAME}:${prefix}`);
+            this._warn = debug_1.default(`${APP_NAME}:WARN:${prefix}`);
+            this._error = debug_1.default(`${APP_NAME}:ERROR:${prefix}`);
+        }
+        else {
+            this._debug = debug_1.default(APP_NAME);
+            this._warn = debug_1.default(`${APP_NAME}:WARN`);
+            this._error = debug_1.default(`${APP_NAME}:ERROR`);
+        }
+        /* eslint-disable no-console */
+        this._debug.log = console.info.bind(console);
+        this._warn.log = console.warn.bind(console);
+        this._error.log = console.error.bind(console);
+        /* eslint-enable no-console */
+    }
+    get debug() {
+        return this._debug;
+    }
+    get warn() {
+        return this._warn;
+    }
+    get error() {
+        return this._error;
+    }
+}
+exports.Logger = Logger;
+
+},{"debug":40}],14:[function(require,module,exports){
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.Producer = void 0;
+const Logger_1 = require("./Logger");
+const EnhancedEventEmitter_1 = require("./EnhancedEventEmitter");
+const errors_1 = require("./errors");
+const logger = new Logger_1.Logger('Producer');
+class Producer extends EnhancedEventEmitter_1.EnhancedEventEmitter {
+    /**
+     * @emits transportclose
+     * @emits trackended
+     * @emits @replacetrack - (track: MediaStreamTrack | null)
+     * @emits @setmaxspatiallayer - (spatialLayer: string)
+     * @emits @setrtpencodingparameters - (params: any)
+     * @emits @getstats
+     * @emits @close
+     */
+    constructor({ id, localId, rtpSender, track, rtpParameters, stopTracks, disableTrackOnPause, zeroRtpOnPause, appData }) {
+        super();
+        // Closed flag.
+        this._closed = false;
+        // Observer instance.
+        this._observer = new EnhancedEventEmitter_1.EnhancedEventEmitter();
+        logger.debug('constructor()');
+        this._id = id;
+        this._localId = localId;
+        this._rtpSender = rtpSender;
+        this._track = track;
+        this._kind = track.kind;
+        this._rtpParameters = rtpParameters;
+        this._paused = disableTrackOnPause ? !track.enabled : false;
+        this._maxSpatialLayer = undefined;
+        this._stopTracks = stopTracks;
+        this._disableTrackOnPause = disableTrackOnPause;
+        this._zeroRtpOnPause = zeroRtpOnPause;
+        this._appData = appData;
+        this._onTrackEnded = this._onTrackEnded.bind(this);
+        // NOTE: Minor issue. If zeroRtpOnPause is true, we cannot emit the
+        // '@replacetrack' event here, so RTCRtpSender.track won't be null.
+        this._handleTrack();
+    }
+    /**
+     * Producer id.
+     */
+    get id() {
+        return this._id;
+    }
+    /**
+     * Local id.
+     */
+    get localId() {
+        return this._localId;
+    }
+    /**
+     * Whether the Producer is closed.
+     */
+    get closed() {
+        return this._closed;
+    }
+    /**
+     * Media kind.
+     */
+    get kind() {
+        return this._kind;
+    }
+    /**
+     * Associated RTCRtpSender.
+     */
+    get rtpSender() {
+        return this._rtpSender;
+    }
+    /**
+     * The associated track.
+     */
+    get track() {
+        return this._track;
+    }
+    /**
+     * RTP parameters.
+     */
+    get rtpParameters() {
+        return this._rtpParameters;
+    }
+    /**
+     * Whether the Producer is paused.
+     */
+    get paused() {
+        return this._paused;
+    }
+    /**
+     * Max spatial layer.
+     *
+     * @type {Number | undefined}
+     */
+    get maxSpatialLayer() {
+        return this._maxSpatialLayer;
+    }
+    /**
+     * App custom data.
+     */
+    get appData() {
+        return this._appData;
+    }
+    /**
+     * Invalid setter.
+     */
+    set appData(appData) {
+        throw new Error('cannot override appData object');
+    }
+    /**
+     * Observer.
+     *
+     * @emits close
+     * @emits pause
+     * @emits resume
+     * @emits trackended
+     */
+    get observer() {
+        return this._observer;
+    }
+    /**
+     * Closes the Producer.
+     */
+    close() {
+        if (this._closed)
+            return;
+        logger.debug('close()');
+        this._closed = true;
+        this._destroyTrack();
+        this.emit('@close');
+        // Emit observer event.
+        this._observer.safeEmit('close');
+    }
+    /**
+     * Transport was closed.
+     */
+    transportClosed() {
+        if (this._closed)
+            return;
+        logger.debug('transportClosed()');
+        this._closed = true;
+        this._destroyTrack();
+        this.safeEmit('transportclose');
+        // Emit observer event.
+        this._observer.safeEmit('close');
+    }
+    /**
+     * Get associated RTCRtpSender stats.
+     */
+    async getStats() {
+        if (this._closed)
+            throw new errors_1.InvalidStateError('closed');
+        return this.safeEmitAsPromise('@getstats');
+    }
+    /**
+     * Pauses sending media.
+     */
+    pause() {
+        logger.debug('pause()');
+        if (this._closed) {
+            logger.error('pause() | Producer closed');
+            return;
+        }
+        this._paused = true;
+        if (this._track && this._disableTrackOnPause) {
+            this._track.enabled = false;
+        }
+        if (this._zeroRtpOnPause) {
+            this.safeEmitAsPromise('@replacetrack', null)
+                .catch(() => { });
+        }
+        // Emit observer event.
+        this._observer.safeEmit('pause');
+    }
+    /**
+     * Resumes sending media.
+     */
+    resume() {
+        logger.debug('resume()');
+        if (this._closed) {
+            logger.error('resume() | Producer closed');
+            return;
+        }
+        this._paused = false;
+        if (this._track && this._disableTrackOnPause) {
+            this._track.enabled = true;
+        }
+        if (this._zeroRtpOnPause) {
+            this.safeEmitAsPromise('@replacetrack', this._track)
+                .catch(() => { });
+        }
+        // Emit observer event.
+        this._observer.safeEmit('resume');
+    }
+    /**
+     * Replaces the current track with a new one or null.
+     */
+    async replaceTrack({ track }) {
+        logger.debug('replaceTrack() [track:%o]', track);
+        if (this._closed) {
+            // This must be done here. Otherwise there is no chance to stop the given
+            // track.
+            if (track && this._stopTracks) {
+                try {
+                    track.stop();
                 }
-
-                /**
-                 * Pluralization helper.
-                 */
-
-                function plural(ms, msAbs, n, name) {
-                    var isPlural = msAbs >= n * 1.5;
-                    return Math.round(ms / n) + ' ' + name + (isPlural ? 's' : '');
+                catch (error) { }
+            }
+            throw new errors_1.InvalidStateError('closed');
+        }
+        else if (track && track.readyState === 'ended') {
+            throw new errors_1.InvalidStateError('track ended');
+        }
+        // Do nothing if this is the same track as the current handled one.
+        if (track === this._track) {
+            logger.debug('replaceTrack() | same track, ignored');
+            return;
+        }
+        if (!this._zeroRtpOnPause || !this._paused) {
+            await this.safeEmitAsPromise('@replacetrack', track);
+        }
+        // Destroy the previous track.
+        this._destroyTrack();
+        // Set the new track.
+        this._track = track;
+        // If this Producer was paused/resumed and the state of the new
+        // track does not match, fix it.
+        if (this._track && this._disableTrackOnPause) {
+            if (!this._paused)
+                this._track.enabled = true;
+            else if (this._paused)
+                this._track.enabled = false;
+        }
+        // Handle the effective track.
+        this._handleTrack();
+    }
+    /**
+     * Sets the video max spatial layer to be sent.
+     */
+    async setMaxSpatialLayer(spatialLayer) {
+        if (this._closed)
+            throw new errors_1.InvalidStateError('closed');
+        else if (this._kind !== 'video')
+            throw new errors_1.UnsupportedError('not a video Producer');
+        else if (typeof spatialLayer !== 'number')
+            throw new TypeError('invalid spatialLayer');
+        if (spatialLayer === this._maxSpatialLayer)
+            return;
+        await this.safeEmitAsPromise('@setmaxspatiallayer', spatialLayer);
+        this._maxSpatialLayer = spatialLayer;
+    }
+    /**
+     * Sets the DSCP value.
+     */
+    async setRtpEncodingParameters(params) {
+        if (this._closed)
+            throw new errors_1.InvalidStateError('closed');
+        else if (typeof params !== 'object')
+            throw new TypeError('invalid params');
+        await this.safeEmitAsPromise('@setrtpencodingparameters', params);
+    }
+    _onTrackEnded() {
+        logger.debug('track "ended" event');
+        this.safeEmit('trackended');
+        // Emit observer event.
+        this._observer.safeEmit('trackended');
+    }
+    _handleTrack() {
+        if (!this._track)
+            return;
+        this._track.addEventListener('ended', this._onTrackEnded);
+    }
+    _destroyTrack() {
+        if (!this._track)
+            return;
+        try {
+            this._track.removeEventListener('ended', this._onTrackEnded);
+            // Just stop the track unless the app set stopTracks: false.
+            if (this._stopTracks)
+                this._track.stop();
+        }
+        catch (error) { }
+    }
+}
+exports.Producer = Producer;
+
+},{"./EnhancedEventEmitter":12,"./Logger":13,"./errors":18}],15:[function(require,module,exports){
+"use strict";
+/**
+ * The RTP capabilities define what mediasoup or an endpoint can receive at
+ * media level.
+ */
+Object.defineProperty(exports, "__esModule", { value: true });
+
+},{}],16:[function(require,module,exports){
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+
+},{}],17:[function(require,module,exports){
+"use strict";
+var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
+}) : (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    o[k2] = m[k];
+}));
+var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
+    Object.defineProperty(o, "default", { enumerable: true, value: v });
+}) : function(o, v) {
+    o["default"] = v;
+});
+var __importStar = (this && this.__importStar) || function (mod) {
+    if (mod && mod.__esModule) return mod;
+    var result = {};
+    if (mod != null) for (var k in mod) if (k !== "default" && Object.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
+    __setModuleDefault(result, mod);
+    return result;
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.Transport = void 0;
+const awaitqueue_1 = require("awaitqueue");
+const Logger_1 = require("./Logger");
+const EnhancedEventEmitter_1 = require("./EnhancedEventEmitter");
+const errors_1 = require("./errors");
+const utils = __importStar(require("./utils"));
+const ortc = __importStar(require("./ortc"));
+const Producer_1 = require("./Producer");
+const Consumer_1 = require("./Consumer");
+const DataProducer_1 = require("./DataProducer");
+const DataConsumer_1 = require("./DataConsumer");
+const logger = new Logger_1.Logger('Transport');
+class Transport extends EnhancedEventEmitter_1.EnhancedEventEmitter {
+    /**
+     * @emits connect - (transportLocalParameters: any, callback: Function, errback: Function)
+     * @emits connectionstatechange - (connectionState: ConnectionState)
+     * @emits produce - (producerLocalParameters: any, callback: Function, errback: Function)
+     * @emits producedata - (dataProducerLocalParameters: any, callback: Function, errback: Function)
+     */
+    constructor({ direction, id, iceParameters, iceCandidates, dtlsParameters, sctpParameters, iceServers, iceTransportPolicy, additionalSettings, proprietaryConstraints, appData, handlerFactory, extendedRtpCapabilities, canProduceByKind }) {
+        super();
+        // Closed flag.
+        this._closed = false;
+        // Transport connection state.
+        this._connectionState = 'new';
+        // Map of Producers indexed by id.
+        this._producers = new Map();
+        // Map of Consumers indexed by id.
+        this._consumers = new Map();
+        // Map of DataProducers indexed by id.
+        this._dataProducers = new Map();
+        // Map of DataConsumers indexed by id.
+        this._dataConsumers = new Map();
+        // Whether the Consumer for RTP probation has been created.
+        this._probatorConsumerCreated = false;
+        // AwaitQueue instance to make async tasks happen sequentially.
+        this._awaitQueue = new awaitqueue_1.AwaitQueue({ ClosedErrorClass: errors_1.InvalidStateError });
+        // Observer instance.
+        this._observer = new EnhancedEventEmitter_1.EnhancedEventEmitter();
+        logger.debug('constructor() [id:%s, direction:%s]', id, direction);
+        this._id = id;
+        this._direction = direction;
+        this._extendedRtpCapabilities = extendedRtpCapabilities;
+        this._canProduceByKind = canProduceByKind;
+        this._maxSctpMessageSize =
+            sctpParameters ? sctpParameters.maxMessageSize : null;
+        // Clone and sanitize additionalSettings.
+        additionalSettings = utils.clone(additionalSettings, {});
+        delete additionalSettings.iceServers;
+        delete additionalSettings.iceTransportPolicy;
+        delete additionalSettings.bundlePolicy;
+        delete additionalSettings.rtcpMuxPolicy;
+        delete additionalSettings.sdpSemantics;
+        this._handler = handlerFactory();
+        this._handler.run({
+            direction,
+            iceParameters,
+            iceCandidates,
+            dtlsParameters,
+            sctpParameters,
+            iceServers,
+            iceTransportPolicy,
+            additionalSettings,
+            proprietaryConstraints,
+            extendedRtpCapabilities
+        });
+        this._appData = appData;
+        this._handleHandler();
+    }
+    /**
+     * Transport id.
+     */
+    get id() {
+        return this._id;
+    }
+    /**
+     * Whether the Transport is closed.
+     */
+    get closed() {
+        return this._closed;
+    }
+    /**
+     * Transport direction.
+     */
+    get direction() {
+        return this._direction;
+    }
+    /**
+     * RTC handler instance.
+     */
+    get handler() {
+        return this._handler;
+    }
+    /**
+     * Connection state.
+     */
+    get connectionState() {
+        return this._connectionState;
+    }
+    /**
+     * App custom data.
+     */
+    get appData() {
+        return this._appData;
+    }
+    /**
+     * Invalid setter.
+     */
+    set appData(appData) {
+        throw new Error('cannot override appData object');
+    }
+    /**
+     * Observer.
+     *
+     * @emits close
+     * @emits newproducer - (producer: Producer)
+     * @emits newconsumer - (producer: Producer)
+     * @emits newdataproducer - (dataProducer: DataProducer)
+     * @emits newdataconsumer - (dataProducer: DataProducer)
+     */
+    get observer() {
+        return this._observer;
+    }
+    /**
+     * Close the Transport.
+     */
+    close() {
+        if (this._closed)
+            return;
+        logger.debug('close()');
+        this._closed = true;
+        // Close the AwaitQueue.
+        this._awaitQueue.close();
+        // Close the handler.
+        this._handler.close();
+        // Close all Producers.
+        for (const producer of this._producers.values()) {
+            producer.transportClosed();
+        }
+        this._producers.clear();
+        // Close all Consumers.
+        for (const consumer of this._consumers.values()) {
+            consumer.transportClosed();
+        }
+        this._consumers.clear();
+        // Close all DataProducers.
+        for (const dataProducer of this._dataProducers.values()) {
+            dataProducer.transportClosed();
+        }
+        this._dataProducers.clear();
+        // Close all DataConsumers.
+        for (const dataConsumer of this._dataConsumers.values()) {
+            dataConsumer.transportClosed();
+        }
+        this._dataConsumers.clear();
+        // Emit observer event.
+        this._observer.safeEmit('close');
+    }
+    /**
+     * Get associated Transport (RTCPeerConnection) stats.
+     *
+     * @returns {RTCStatsReport}
+     */
+    async getStats() {
+        if (this._closed)
+            throw new errors_1.InvalidStateError('closed');
+        return this._handler.getTransportStats();
+    }
+    /**
+     * Restart ICE connection.
+     */
+    async restartIce({ iceParameters }) {
+        logger.debug('restartIce()');
+        if (this._closed)
+            throw new errors_1.InvalidStateError('closed');
+        else if (!iceParameters)
+            throw new TypeError('missing iceParameters');
+        // Enqueue command.
+        return this._awaitQueue.push(async () => this._handler.restartIce(iceParameters), 'transport.restartIce()');
+    }
+    /**
+     * Update ICE servers.
+     */
+    async updateIceServers({ iceServers } = {}) {
+        logger.debug('updateIceServers()');
+        if (this._closed)
+            throw new errors_1.InvalidStateError('closed');
+        else if (!Array.isArray(iceServers))
+            throw new TypeError('missing iceServers');
+        // Enqueue command.
+        return this._awaitQueue.push(async () => this._handler.updateIceServers(iceServers), 'transport.updateIceServers()');
+    }
+    /**
+     * Create a Producer.
+     */
+    async produce({ track, encodings, codecOptions, codec, stopTracks = true, disableTrackOnPause = true, zeroRtpOnPause = false, appData = {} } = {}) {
+        logger.debug('produce() [track:%o]', track);
+        if (!track)
+            throw new TypeError('missing track');
+        else if (this._direction !== 'send')
+            throw new errors_1.UnsupportedError('not a sending Transport');
+        else if (!this._canProduceByKind[track.kind])
+            throw new errors_1.UnsupportedError(`cannot produce ${track.kind}`);
+        else if (track.readyState === 'ended')
+            throw new errors_1.InvalidStateError('track ended');
+        else if (this.listenerCount('connect') === 0 && this._connectionState === 'new')
+            throw new TypeError('no "connect" listener set into this transport');
+        else if (this.listenerCount('produce') === 0)
+            throw new TypeError('no "produce" listener set into this transport');
+        else if (appData && typeof appData !== 'object')
+            throw new TypeError('if given, appData must be an object');
+        // Enqueue command.
+        return this._awaitQueue.push(async () => {
+            let normalizedEncodings;
+            if (encodings && !Array.isArray(encodings)) {
+                throw TypeError('encodings must be an array');
+            }
+            else if (encodings && encodings.length === 0) {
+                normalizedEncodings = undefined;
+            }
+            else if (encodings) {
+                normalizedEncodings = encodings
+                    .map((encoding) => {
+                    const normalizedEncoding = { active: true };
+                    if (encoding.active === false)
+                        normalizedEncoding.active = false;
+                    if (typeof encoding.dtx === 'boolean')
+                        normalizedEncoding.dtx = encoding.dtx;
+                    if (typeof encoding.scalabilityMode === 'string')
+                        normalizedEncoding.scalabilityMode = encoding.scalabilityMode;
+                    if (typeof encoding.scaleResolutionDownBy === 'number')
+                        normalizedEncoding.scaleResolutionDownBy = encoding.scaleResolutionDownBy;
+                    if (typeof encoding.maxBitrate === 'number')
+                        normalizedEncoding.maxBitrate = encoding.maxBitrate;
+                    if (typeof encoding.maxFramerate === 'number')
+                        normalizedEncoding.maxFramerate = encoding.maxFramerate;
+                    if (typeof encoding.adaptivePtime === 'boolean')
+                        normalizedEncoding.adaptivePtime = encoding.adaptivePtime;
+                    if (typeof encoding.priority === 'string')
+                        normalizedEncoding.priority = encoding.priority;
+                    if (typeof encoding.networkPriority === 'string')
+                        normalizedEncoding.networkPriority = encoding.networkPriority;
+                    return normalizedEncoding;
+                });
+            }
+            const { localId, rtpParameters, rtpSender } = await this._handler.send({
+                track,
+                encodings: normalizedEncodings,
+                codecOptions,
+                codec
+            });
+            try {
+                // This will fill rtpParameters's missing fields with default values.
+                ortc.validateRtpParameters(rtpParameters);
+                const { id } = await this.safeEmitAsPromise('produce', {
+                    kind: track.kind,
+                    rtpParameters,
+                    appData
+                });
+                const producer = new Producer_1.Producer({
+                    id,
+                    localId,
+                    rtpSender,
+                    track,
+                    rtpParameters,
+                    stopTracks,
+                    disableTrackOnPause,
+                    zeroRtpOnPause,
+                    appData
+                });
+                this._producers.set(producer.id, producer);
+                this._handleProducer(producer);
+                // Emit observer event.
+                this._observer.safeEmit('newproducer', producer);
+                return producer;
+            }
+            catch (error) {
+                this._handler.stopSending(localId)
+                    .catch(() => { });
+                throw error;
+            }
+        }, 'transport.produce()')
+            // This catch is needed to stop the given track if the command above
+            // failed due to closed Transport.
+            .catch((error) => {
+            if (stopTracks) {
+                try {
+                    track.stop();
                 }
-            },
-            {},
-        ],
-        7: [
-            function (require, module, exports) {
-                'use strict';
-                Object.defineProperty(exports, '__esModule', { value: true });
-                const Logger_1 = require('./Logger');
-                const EnhancedEventEmitter_1 = require('./EnhancedEventEmitter');
-                const errors_1 = require('./errors');
-                const logger = new Logger_1.Logger('Consumer');
-                class Consumer extends EnhancedEventEmitter_1.EnhancedEventEmitter {
-                    /**
-                     * @emits transportclose
-                     * @emits trackended
-                     * @emits @getstats
-                     * @emits @close
-                     */
-                    constructor({ id, localId, producerId, rtpReceiver, track, rtpParameters, appData }) {
-                        super();
-                        // Closed flag.
-                        this._closed = false;
-                        logger.debug('constructor()');
-                        this._id = id;
-                        this._localId = localId;
-                        this._producerId = producerId;
-                        this._rtpReceiver = rtpReceiver;
-                        this._track = track;
-                        this._rtpParameters = rtpParameters;
-                        this._paused = !track.enabled;
-                        this._appData = appData;
-                        this._onTrackEnded = this._onTrackEnded.bind(this);
-                        this._handleTrack();
-                    }
-                    /**
-                     * Consumer id.
-                     */
-                    get id() {
-                        return this._id;
-                    }
-                    /**
-                     * Local id.
-                     */
-                    get localId() {
-                        return this._localId;
-                    }
-                    /**
-                     * Associated Producer id.
-                     */
-                    get producerId() {
-                        return this._producerId;
-                    }
-                    /**
-                     * Whether the Consumer is closed.
-                     */
-                    get closed() {
-                        return this._closed;
-                    }
-                    /**
-                     * Media kind.
-                     */
-                    get kind() {
-                        return this._track.kind;
-                    }
-                    /**
-                     * Associated RTCRtpReceiver.
-                     */
-                    get rtpReceiver() {
-                        return this._rtpReceiver;
-                    }
-                    /**
-                     * The associated track.
-                     */
-                    get track() {
-                        return this._track;
-                    }
-                    /**
-                     * RTP parameters.
-                     */
-                    get rtpParameters() {
-                        return this._rtpParameters;
-                    }
-                    /**
-                     * Whether the Consumer is paused.
-                     */
-                    get paused() {
-                        return this._paused;
-                    }
-                    /**
-                     * App custom data.
-                     */
-                    get appData() {
-                        return this._appData;
-                    }
-                    /**
-                     * Invalid setter.
-                     */
-                    set appData(appData) {
-                        throw new Error('cannot override appData object');
-                    }
-                    /**
-                     * Closes the Consumer.
-                     */
-                    close() {
-                        if (this._closed) return;
-                        logger.debug('close()');
-                        this._closed = true;
-                        this._destroyTrack();
-                        this.emit('@close');
-                    }
-                    /**
-                     * Transport was closed.
-                     */
-                    transportClosed() {
-                        if (this._closed) return;
-                        logger.debug('transportClosed()');
-                        this._closed = true;
-                        this._destroyTrack();
-                        this.safeEmit('transportclose');
-                    }
-                    /**
-                     * Get associated RTCRtpReceiver stats.
-                     */
-                    async getStats() {
-                        if (this._closed) throw new errors_1.InvalidStateError('closed');
-                        return this.safeEmitAsPromise('@getstats');
-                    }
-                    /**
-                     * Pauses receiving media.
-                     */
-                    pause() {
-                        logger.debug('pause()');
-                        if (this._closed) {
-                            logger.error('pause() | Consumer closed');
-                            return;
-                        }
-                        this._paused = true;
-                        this._track.enabled = false;
-                    }
-                    /**
-                     * Resumes receiving media.
-                     */
-                    resume() {
-                        logger.debug('resume()');
-                        if (this._closed) {
-                            logger.error('resume() | Consumer closed');
-                            return;
-                        }
-                        this._paused = false;
-                        this._track.enabled = true;
-                    }
-                    _onTrackEnded() {
-                        logger.debug('track "ended" event');
-                        this.safeEmit('trackended');
-                    }
-                    _handleTrack() {
-                        this._track.addEventListener('ended', this._onTrackEnded);
-                    }
-                    _destroyTrack() {
-                        try {
-                            this._track.removeEventListener('ended', this._onTrackEnded);
-                            this._track.stop();
-                        } catch (error) {}
-                    }
+                catch (error2) { }
+            }
+            throw error;
+        });
+    }
+    /**
+     * Create a Consumer to consume a remote Producer.
+     */
+    async consume({ id, producerId, kind, rtpParameters, appData = {} }) {
+        logger.debug('consume()');
+        rtpParameters = utils.clone(rtpParameters, undefined);
+        if (this._closed)
+            throw new errors_1.InvalidStateError('closed');
+        else if (this._direction !== 'recv')
+            throw new errors_1.UnsupportedError('not a receiving Transport');
+        else if (typeof id !== 'string')
+            throw new TypeError('missing id');
+        else if (typeof producerId !== 'string')
+            throw new TypeError('missing producerId');
+        else if (kind !== 'audio' && kind !== 'video')
+            throw new TypeError(`invalid kind '${kind}'`);
+        else if (this.listenerCount('connect') === 0 && this._connectionState === 'new')
+            throw new TypeError('no "connect" listener set into this transport');
+        else if (appData && typeof appData !== 'object')
+            throw new TypeError('if given, appData must be an object');
+        // Enqueue command.
+        return this._awaitQueue.push(async () => {
+            // Ensure the device can consume it.
+            const canConsume = ortc.canReceive(rtpParameters, this._extendedRtpCapabilities);
+            if (!canConsume)
+                throw new errors_1.UnsupportedError('cannot consume this Producer');
+            const { localId, rtpReceiver, track } = await this._handler.receive({ trackId: id, kind, rtpParameters });
+            const consumer = new Consumer_1.Consumer({
+                id,
+                localId,
+                producerId,
+                rtpReceiver,
+                track,
+                rtpParameters,
+                appData
+            });
+            this._consumers.set(consumer.id, consumer);
+            this._handleConsumer(consumer);
+            // If this is the first video Consumer and the Consumer for RTP probation
+            // has not yet been created, create it now.
+            if (!this._probatorConsumerCreated && kind === 'video') {
+                try {
+                    const probatorRtpParameters = ortc.generateProbatorRtpParameters(consumer.rtpParameters);
+                    await this._handler.receive({
+                        trackId: 'probator',
+                        kind: 'video',
+                        rtpParameters: probatorRtpParameters
+                    });
+                    logger.debug('consume() | Consumer for RTP probation created');
+                    this._probatorConsumerCreated = true;
                 }
-                exports.Consumer = Consumer;
-            },
-            { './EnhancedEventEmitter': 11, './Logger': 12, './errors': 15 },
-        ],
-        8: [
-            function (require, module, exports) {
-                'use strict';
-                Object.defineProperty(exports, '__esModule', { value: true });
-                const Logger_1 = require('./Logger');
-                const EnhancedEventEmitter_1 = require('./EnhancedEventEmitter');
-                const logger = new Logger_1.Logger('DataConsumer');
-                class DataConsumer extends EnhancedEventEmitter_1.EnhancedEventEmitter {
-                    /**
-                     * @emits transportclose
-                     * @emits open
-                     * @emits error - (error: Error)
-                     * @emits close
-                     * @emits message - (message: any)
-                     * @emits @close
-                     */
-                    constructor({ id, dataProducerId, dataChannel, sctpStreamParameters, appData }) {
-                        super();
-                        // Closed flag.
-                        this._closed = false;
-                        logger.debug('constructor()');
-                        this._id = id;
-                        this._dataProducerId = dataProducerId;
-                        this._dataChannel = dataChannel;
-                        this._sctpStreamParameters = sctpStreamParameters;
-                        this._appData = appData;
-                        this._handleDataChannel();
-                    }
-                    /**
-                     * DataConsumer id.
-                     */
-                    get id() {
-                        return this._id;
-                    }
-                    /**
-                     * Associated DataProducer id.
-                     */
-                    get dataProducerId() {
-                        return this._dataProducerId;
-                    }
-                    /**
-                     * Whether the DataConsumer is closed.
-                     */
-                    get closed() {
-                        return this._closed;
-                    }
-                    /**
-                     * SCTP stream parameters.
-                     */
-                    get sctpStreamParameters() {
-                        return this._sctpStreamParameters;
-                    }
-                    /**
-                     * DataChannel readyState.
-                     */
-                    get readyState() {
-                        return this._dataChannel.readyState;
-                    }
-                    /**
-                     * DataChannel label.
-                     */
-                    get label() {
-                        return this._dataChannel.label;
-                    }
-                    /**
-                     * DataChannel protocol.
-                     */
-                    get protocol() {
-                        return this._dataChannel.protocol;
-                    }
-                    /**
-                     * DataChannel binaryType.
-                     */
-                    get binaryType() {
-                        return this._dataChannel.binaryType;
-                    }
-                    /**
-                     * Set DataChannel binaryType.
-                     */
-                    set binaryType(binaryType) {
-                        this._dataChannel.binaryType = binaryType;
-                    }
-                    /**
-                     * App custom data.
-                     */
-                    get appData() {
-                        return this._appData;
-                    }
-                    /**
-                     * Invalid setter.
-                     */
-                    set appData(appData) {
-                        throw new Error('cannot override appData object');
-                    }
-                    /**
-                     * Closes the DataConsumer.
-                     */
-                    close() {
-                        if (this._closed) return;
-                        logger.debug('close()');
-                        this._closed = true;
-                        this._dataChannel.close();
-                        this.emit('@close');
-                    }
-                    /**
-                     * Transport was closed.
-                     */
-                    transportClosed() {
-                        if (this._closed) return;
-                        logger.debug('transportClosed()');
-                        this._closed = true;
-                        this._dataChannel.close();
-                        this.safeEmit('transportclose');
-                    }
-                    _handleDataChannel() {
-                        this._dataChannel.addEventListener('open', () => {
-                            if (this._closed) return;
-                            logger.debug('DataChannel "open" event');
-                            this.safeEmit('open');
-                        });
-                        this._dataChannel.addEventListener('error', (event) => {
-                            if (this._closed) return;
-                            let { error } = event;
-                            if (!error) error = new Error('unknown DataChannel error');
-                            if (error.errorDetail === 'sctp-failure') {
-                                logger.error(
-                                    'DataChannel SCTP error [sctpCauseCode:%s]: %s',
-                                    error.sctpCauseCode,
-                                    error.message,
-                                );
-                            } else {
-                                logger.error('DataChannel "error" event: %o', error);
-                            }
-                            this.safeEmit('error', error);
-                        });
-                        this._dataChannel.addEventListener('close', () => {
-                            if (this._closed) return;
-                            logger.warn('DataChannel "close" event');
-                            this._closed = true;
-                            this.emit('@close');
-                            this.safeEmit('close');
-                        });
-                        this._dataChannel.addEventListener('message', (event) => {
-                            if (this._closed) return;
-                            this.safeEmit('message', event.data);
-                        });
-                    }
+                catch (error) {
+                    logger.error('consume() | failed to create Consumer for RTP probation:%o', error);
                 }
-                exports.DataConsumer = DataConsumer;
-            },
-            { './EnhancedEventEmitter': 11, './Logger': 12 },
-        ],
-        9: [
-            function (require, module, exports) {
-                'use strict';
-                Object.defineProperty(exports, '__esModule', { value: true });
-                const Logger_1 = require('./Logger');
-                const EnhancedEventEmitter_1 = require('./EnhancedEventEmitter');
-                const errors_1 = require('./errors');
-                const logger = new Logger_1.Logger('DataProducer');
-                class DataProducer extends EnhancedEventEmitter_1.EnhancedEventEmitter {
-                    /**
-                     * @emits transportclose
-                     * @emits open
-                     * @emits error - (error: Error)
-                     * @emits close
-                     * @emits bufferedamountlow
-                     * @emits @close
-                     */
-                    constructor({ id, dataChannel, sctpStreamParameters, appData }) {
-                        super();
-                        // Closed flag.
-                        this._closed = false;
-                        logger.debug('constructor()');
-                        this._id = id;
-                        this._dataChannel = dataChannel;
-                        this._sctpStreamParameters = sctpStreamParameters;
-                        this._appData = appData;
-                        this._handleDataChannel();
-                    }
-                    /**
-                     * DataProducer id.
-                     */
-                    get id() {
-                        return this._id;
-                    }
-                    /**
-                     * Whether the DataProducer is closed.
-                     */
-                    get closed() {
-                        return this._closed;
-                    }
-                    /**
-                     * SCTP stream parameters.
-                     */
-                    get sctpStreamParameters() {
-                        return this._sctpStreamParameters;
-                    }
-                    /**
-                     * DataChannel readyState.
-                     */
-                    get readyState() {
-                        return this._dataChannel.readyState;
-                    }
-                    /**
-                     * DataChannel label.
-                     */
-                    get label() {
-                        return this._dataChannel.label;
-                    }
-                    /**
-                     * DataChannel protocol.
-                     */
-                    get protocol() {
-                        return this._dataChannel.protocol;
-                    }
-                    /**
-                     * DataChannel bufferedAmount.
-                     */
-                    get bufferedAmount() {
-                        return this._dataChannel.bufferedAmount;
-                    }
-                    /**
-                     * DataChannel bufferedAmountLowThreshold.
-                     */
-                    get bufferedAmountLowThreshold() {
-                        return this._dataChannel.bufferedAmountLowThreshold;
-                    }
-                    /**
-                     * Set DataChannel bufferedAmountLowThreshold.
-                     */
-                    set bufferedAmountLowThreshold(bufferedAmountLowThreshold) {
-                        this._dataChannel.bufferedAmountLowThreshold = bufferedAmountLowThreshold;
-                    }
-                    /**
-                     * App custom data.
-                     */
-                    get appData() {
-                        return this._appData;
-                    }
-                    /**
-                     * Invalid setter.
-                     */
-                    set appData(appData) {
-                        throw new Error('cannot override appData object');
-                    }
-                    /**
-                     * Closes the DataProducer.
-                     */
-                    close() {
-                        if (this._closed) return;
-                        logger.debug('close()');
-                        this._closed = true;
-                        this._dataChannel.close();
-                        this.emit('@close');
-                    }
-                    /**
-                     * Transport was closed.
-                     */
-                    transportClosed() {
-                        if (this._closed) return;
-                        logger.debug('transportClosed()');
-                        this._closed = true;
-                        this._dataChannel.close();
-                        this.safeEmit('transportclose');
-                    }
-                    /**
-                     * Send a message.
-                     *
-                     * @param {String|Blob|ArrayBuffer|ArrayBufferView} data.
-                     */
-                    send(data) {
-                        logger.debug('send()');
-                        if (this._closed) throw new errors_1.InvalidStateError('closed');
-                        this._dataChannel.send(data);
-                    }
-                    _handleDataChannel() {
-                        this._dataChannel.addEventListener('open', () => {
-                            if (this._closed) return;
-                            logger.debug('DataChannel "open" event');
-                            this.safeEmit('open');
-                        });
-                        this._dataChannel.addEventListener('error', (event) => {
-                            if (this._closed) return;
-                            let { error } = event;
-                            if (!error) error = new Error('unknown DataChannel error');
-                            if (error.errorDetail === 'sctp-failure') {
-                                logger.error(
-                                    'DataChannel SCTP error [sctpCauseCode:%s]: %s',
-                                    error.sctpCauseCode,
-                                    error.message,
-                                );
-                            } else {
-                                logger.error('DataChannel "error" event: %o', error);
-                            }
-                            this.safeEmit('error', error);
-                        });
-                        this._dataChannel.addEventListener('close', () => {
-                            if (this._closed) return;
-                            logger.warn('DataChannel "close" event');
-                            this._closed = true;
-                            this.emit('@close');
-                            this.safeEmit('close');
-                        });
-                        this._dataChannel.addEventListener('message', () => {
-                            if (this._closed) return;
-                            logger.warn('DataChannel "message" event in a DataProducer, message discarded');
-                        });
-                        this._dataChannel.addEventListener('bufferedamountlow', () => {
-                            if (this._closed) return;
-                            this.safeEmit('bufferedamountlow');
-                        });
-                    }
-                }
-                exports.DataProducer = DataProducer;
-            },
-            { './EnhancedEventEmitter': 11, './Logger': 12, './errors': 15 },
-        ],
-        10: [
-            function (require, module, exports) {
-                'use strict';
-                /* global RTCRtpTransceiver */
-                Object.defineProperty(exports, '__esModule', { value: true });
-                const bowser = require('bowser');
-                const Logger_1 = require('./Logger');
-                const errors_1 = require('./errors');
-                const ortc = require('./ortc');
-                const Transport_1 = require('./Transport');
-                const Chrome74_1 = require('./handlers/Chrome74');
-                const Chrome70_1 = require('./handlers/Chrome70');
-                const Chrome67_1 = require('./handlers/Chrome67');
-                const Chrome55_1 = require('./handlers/Chrome55');
-                const Firefox60_1 = require('./handlers/Firefox60');
-                const Safari12_1 = require('./handlers/Safari12');
-                const Safari11_1 = require('./handlers/Safari11');
-                const Edge11_1 = require('./handlers/Edge11');
-                const ReactNative_1 = require('./handlers/ReactNative');
-                const logger = new Logger_1.Logger('Device');
-                function detectDevice() {
-                    // React-Native.
-                    // NOTE: react-native-webrtc >= 1.75.0 is required.
-                    if (typeof navigator === 'object' && navigator.product === 'ReactNative') {
-                        if (typeof RTCPeerConnection === 'undefined') {
-                            logger.warn('this._detectDevice() | unsupported ReactNative without RTCPeerConnection');
-                            return undefined;
-                        }
-                        logger.debug('this._detectDevice() | ReactNative handler chosen');
-                        return 'ReactNative';
-                    }
-                    // Browser.
-                    else if (typeof navigator === 'object' && typeof navigator.userAgent === 'string') {
-                        const ua = navigator.userAgent;
-                        const browser = bowser.getParser(ua);
-                        const engine = browser.getEngine();
-                        // Chrome and Chromium.
-                        if (browser.satisfies({ chrome: '>=74', chromium: '>=74' })) {
-                            return 'Chrome74';
-                        } else if (browser.satisfies({ chrome: '>=70', chromium: '>=70' })) {
-                            return 'Chrome70';
-                        } else if (browser.satisfies({ chrome: '>=67', chromium: '>=67' })) {
-                            return 'Chrome67';
-                        } else if (browser.satisfies({ chrome: '>=55', chromium: '>=55' })) {
-                            return 'Chrome55';
-                        }
-                        // Firefox.
-                        else if (browser.satisfies({ firefox: '>=60' })) {
-                            return 'Firefox60';
-                        }
-                        // Safari with Unified-Plan support enabled.
-                        else if (
-                            browser.satisfies({ safari: '>=12.0' }) &&
-                            typeof RTCRtpTransceiver !== 'undefined' &&
-                            RTCRtpTransceiver.prototype.hasOwnProperty('currentDirection')
-                        ) {
-                            return 'Safari12';
-                        }
-                        // Safari with Plab-B support.
-                        else if (browser.satisfies({ safari: '>=11' })) {
-                            return 'Safari11';
-                        }
-                        // Old Edge with ORTC support.
-                        else if (
-                            browser.satisfies({ 'microsoft edge': '>=11' }) &&
-                            browser.satisfies({ 'microsoft edge': '<=18' })
-                        ) {
-                            return 'Edge11';
-                        }
-                        // Best effort for Chromium based browsers.
-                        else if (engine.name && engine.name.toLowerCase() === 'blink') {
-                            const match = ua.match(/(?:(?:Chrome|Chromium))[ /](\w+)/i);
-                            if (match) {
-                                const version = Number(match[1]);
-                                if (version >= 74) {
-                                    return 'Chrome74';
-                                } else if (version >= 70) {
-                                    return 'Chrome70';
-                                } else if (version >= 67) {
-                                    return 'Chrome67';
-                                } else {
-                                    return 'Chrome55';
-                                }
-                            } else {
-                                return 'Chrome74';
-                            }
-                        }
-                        // Unsupported browser.
-                        else {
-                            logger.warn(
-                                'this._detectDevice() | browser not supported [name:%s, version:%s]',
-                                browser.getBrowserName(),
-                                browser.getBrowserVersion(),
-                            );
-                            return undefined;
-                        }
-                    }
-                    // Unknown device.
-                    else {
-                        logger.warn('this._detectDevice() | unknown device');
-                        return undefined;
-                    }
-                }
-                exports.detectDevice = detectDevice;
-                class Device {
-                    /**
-                     * Create a new Device to connect to mediasoup server.
-                     *
-                     * @throws {UnsupportedError} if device is not supported.
-                     */
-                    constructor({ handlerName, handlerFactory, Handler } = {}) {
-                        // Loaded flag.
-                        this._loaded = false;
-                        logger.debug('constructor()');
-                        // Handle deprecated option.
-                        if (Handler) {
-                            logger.warn(
-                                'constructor() | Handler option is DEPRECATED, use handlerName or handlerFactory instead',
-                            );
-                            if (typeof Handler === 'string') handlerName = Handler;
-                            else
-                                throw new TypeError(
-                                    'non string Handler option no longer supported, use handlerFactory instead',
-                                );
-                        }
-                        if (handlerName && handlerFactory) {
-                            throw new TypeError('just one of handlerName or handlerInterface can be given');
-                        }
-                        if (handlerFactory) {
-                            this._handlerFactory = handlerFactory;
-                        } else {
-                            if (handlerName) {
-                                logger.debug('constructor() | handler given: %s', handlerName);
-                            } else {
-                                handlerName = detectDevice();
-                                if (handlerName) logger.debug('constructor() | detected handler: %s', handlerName);
-                                else throw new errors_1.UnsupportedError('device not supported');
-                            }
-                            switch (handlerName) {
-                                case 'Chrome74':
-                                    this._handlerFactory = Chrome74_1.Chrome74.createFactory();
-                                    break;
-                                case 'Chrome70':
-                                    this._handlerFactory = Chrome70_1.Chrome70.createFactory();
-                                    break;
-                                case 'Chrome67':
-                                    this._handlerFactory = Chrome67_1.Chrome67.createFactory();
-                                    break;
-                                case 'Chrome55':
-                                    this._handlerFactory = Chrome55_1.Chrome55.createFactory();
-                                    break;
-                                case 'Firefox60':
-                                    this._handlerFactory = Firefox60_1.Firefox60.createFactory();
-                                    break;
-                                case 'Safari12':
-                                    this._handlerFactory = Safari12_1.Safari12.createFactory();
-                                    break;
-                                case 'Safari11':
-                                    this._handlerFactory = Safari11_1.Safari11.createFactory();
-                                    break;
-                                case 'Edge11':
-                                    this._handlerFactory = Edge11_1.Edge11.createFactory();
-                                    break;
-                                case 'ReactNative':
-                                    this._handlerFactory = ReactNative_1.ReactNative.createFactory();
-                                    break;
-                                default:
-                                    throw new TypeError(`unknown handlerName "${handlerName}"`);
-                            }
-                        }
-                        // Create a temporal handler to get its name.
-                        const handler = this._handlerFactory();
-                        this._handlerName = handler.name;
-                        handler.close();
-                        this._extendedRtpCapabilities = undefined;
-                        this._recvRtpCapabilities = undefined;
-                        this._canProduceByKind = {
-                            audio: false,
-                            video: false,
-                        };
-                        this._sctpCapabilities = undefined;
-                    }
-                    /**
-                     * The RTC handler name.
-                     */
-                    get handlerName() {
-                        return this._handlerName;
-                    }
-                    /**
-                     * Whether the Device is loaded.
-                     */
-                    get loaded() {
-                        return this._loaded;
-                    }
-                    /**
-                     * RTP capabilities of the Device for receiving media.
-                     *
-                     * @throws {InvalidStateError} if not loaded.
-                     */
-                    get rtpCapabilities() {
-                        if (!this._loaded) throw new errors_1.InvalidStateError('not loaded');
-                        return this._recvRtpCapabilities;
-                    }
-                    /**
-                     * SCTP capabilities of the Device.
-                     *
-                     * @throws {InvalidStateError} if not loaded.
-                     */
-                    get sctpCapabilities() {
-                        if (!this._loaded) throw new errors_1.InvalidStateError('not loaded');
-                        return this._sctpCapabilities;
-                    }
-                    /**
-                     * Initialize the Device.
-                     */
-                    async load({ routerRtpCapabilities }) {
-                        logger.debug('load() [routerRtpCapabilities:%o]', routerRtpCapabilities);
-                        // Temporal handler to get its capabilities.
-                        let handler;
-                        try {
-                            if (this._loaded) throw new errors_1.InvalidStateError('already loaded');
-                            // This may throw.
-                            ortc.validateRtpCapabilities(routerRtpCapabilities);
-                            handler = this._handlerFactory();
-                            const nativeRtpCapabilities = await handler.getNativeRtpCapabilities();
-                            logger.debug('load() | got native RTP capabilities:%o', nativeRtpCapabilities);
-                            // This may throw.
-                            ortc.validateRtpCapabilities(nativeRtpCapabilities);
-                            // Get extended RTP capabilities.
-                            this._extendedRtpCapabilities = ortc.getExtendedRtpCapabilities(
-                                nativeRtpCapabilities,
-                                routerRtpCapabilities,
-                            );
-                            logger.debug('load() | got extended RTP capabilities:%o', this._extendedRtpCapabilities);
-                            // Check whether we can produce audio/video.
-                            this._canProduceByKind.audio = ortc.canSend('audio', this._extendedRtpCapabilities);
-                            this._canProduceByKind.video = ortc.canSend('video', this._extendedRtpCapabilities);
-                            // Generate our receiving RTP capabilities for receiving media.
-                            this._recvRtpCapabilities = ortc.getRecvRtpCapabilities(this._extendedRtpCapabilities);
-                            // This may throw.
-                            ortc.validateRtpCapabilities(this._recvRtpCapabilities);
-                            logger.debug('load() | got receiving RTP capabilities:%o', this._recvRtpCapabilities);
-                            // Generate our SCTP capabilities.
-                            this._sctpCapabilities = await handler.getNativeSctpCapabilities();
-                            logger.debug('load() | got native SCTP capabilities:%o', this._sctpCapabilities);
-                            // This may throw.
-                            ortc.validateSctpCapabilities(this._sctpCapabilities);
-                            logger.debug('load() succeeded');
-                            this._loaded = true;
-                            handler.close();
-                        } catch (error) {
-                            if (handler) handler.close();
-                            throw error;
-                        }
-                    }
-                    /**
-                     * Whether we can produce audio/video.
-                     *
-                     * @throws {InvalidStateError} if not loaded.
-                     * @throws {TypeError} if wrong arguments.
-                     */
-                    canProduce(kind) {
-                        if (!this._loaded) throw new errors_1.InvalidStateError('not loaded');
-                        else if (kind !== 'audio' && kind !== 'video') throw new TypeError(`invalid kind "${kind}"`);
-                        return this._canProduceByKind[kind];
-                    }
-                    /**
-                     * Creates a Transport for sending media.
-                     *
-                     * @throws {InvalidStateError} if not loaded.
-                     * @throws {TypeError} if wrong arguments.
-                     */
-                    createSendTransport({
-                        id,
-                        iceParameters,
-                        iceCandidates,
-                        dtlsParameters,
-                        sctpParameters,
-                        iceServers,
-                        iceTransportPolicy,
-                        additionalSettings,
-                        proprietaryConstraints,
-                        appData = {},
-                    }) {
-                        logger.debug('createSendTransport()');
-                        return this._createTransport({
-                            direction: 'send',
-                            id: id,
-                            iceParameters: iceParameters,
-                            iceCandidates: iceCandidates,
-                            dtlsParameters: dtlsParameters,
-                            sctpParameters: sctpParameters,
-                            iceServers: iceServers,
-                            iceTransportPolicy: iceTransportPolicy,
-                            additionalSettings: additionalSettings,
-                            proprietaryConstraints: proprietaryConstraints,
-                            appData: appData,
-                        });
-                    }
-                    /**
-                     * Creates a Transport for receiving media.
-                     *
-                     * @throws {InvalidStateError} if not loaded.
-                     * @throws {TypeError} if wrong arguments.
-                     */
-                    createRecvTransport({
-                        id,
-                        iceParameters,
-                        iceCandidates,
-                        dtlsParameters,
-                        sctpParameters,
-                        iceServers,
-                        iceTransportPolicy,
-                        additionalSettings,
-                        proprietaryConstraints,
-                        appData = {},
-                    }) {
-                        logger.debug('createRecvTransport()');
-                        return this._createTransport({
-                            direction: 'recv',
-                            id: id,
-                            iceParameters: iceParameters,
-                            iceCandidates: iceCandidates,
-                            dtlsParameters: dtlsParameters,
-                            sctpParameters: sctpParameters,
-                            iceServers: iceServers,
-                            iceTransportPolicy: iceTransportPolicy,
-                            additionalSettings: additionalSettings,
-                            proprietaryConstraints: proprietaryConstraints,
-                            appData: appData,
-                        });
-                    }
-                    _createTransport({
-                        direction,
-                        id,
-                        iceParameters,
-                        iceCandidates,
-                        dtlsParameters,
-                        sctpParameters,
-                        iceServers,
-                        iceTransportPolicy,
-                        additionalSettings,
-                        proprietaryConstraints,
-                        appData = {},
-                    }) {
-                        if (!this._loaded) throw new errors_1.InvalidStateError('not loaded');
-                        else if (typeof id !== 'string') throw new TypeError('missing id');
-                        else if (typeof iceParameters !== 'object') throw new TypeError('missing iceParameters');
-                        else if (!Array.isArray(iceCandidates)) throw new TypeError('missing iceCandidates');
-                        else if (typeof dtlsParameters !== 'object') throw new TypeError('missing dtlsParameters');
-                        else if (sctpParameters && typeof sctpParameters !== 'object')
-                            throw new TypeError('wrong sctpParameters');
-                        else if (appData && typeof appData !== 'object')
-                            throw new TypeError('if given, appData must be an object');
-                        // Create a new Transport.
-                        const transport = new Transport_1.Transport({
-                            direction,
-                            id,
-                            iceParameters,
-                            iceCandidates,
-                            dtlsParameters,
-                            sctpParameters,
-                            iceServers,
-                            iceTransportPolicy,
-                            additionalSettings,
-                            proprietaryConstraints,
-                            appData,
-                            handlerFactory: this._handlerFactory,
-                            extendedRtpCapabilities: this._extendedRtpCapabilities,
-                            canProduceByKind: this._canProduceByKind,
-                        });
-                        return transport;
-                    }
-                }
-                exports.Device = Device;
-            },
-            {
-                './Logger': 12,
-                './Transport': 14,
-                './errors': 15,
-                './handlers/Chrome55': 16,
-                './handlers/Chrome67': 17,
-                './handlers/Chrome70': 18,
-                './handlers/Chrome74': 19,
-                './handlers/Edge11': 20,
-                './handlers/Firefox60': 21,
-                './handlers/ReactNative': 23,
-                './handlers/Safari11': 24,
-                './handlers/Safari12': 25,
-                './ortc': 33,
-                bowser: 2,
-            },
-        ],
-        11: [
-            function (require, module, exports) {
-                'use strict';
-                Object.defineProperty(exports, '__esModule', { value: true });
-                const events_1 = require('events');
-                const Logger_1 = require('./Logger');
-                const logger = new Logger_1.Logger('EnhancedEventEmitter');
-                class EnhancedEventEmitter extends events_1.EventEmitter {
-                    constructor() {
-                        super();
-                        this.setMaxListeners(Infinity);
-                    }
-                    safeEmit(event, ...args) {
-                        const numListeners = this.listenerCount(event);
-                        try {
-                            return this.emit(event, ...args);
-                        } catch (error) {
-                            logger.error('safeEmit() | event listener threw an error [event:%s]:%o', event, error);
-                            return Boolean(numListeners);
-                        }
-                    }
-                    async safeEmitAsPromise(event, ...args) {
-                        return new Promise((resolve, reject) => this.safeEmit(event, ...args, resolve, reject));
-                    }
-                }
-                exports.EnhancedEventEmitter = EnhancedEventEmitter;
-            },
-            { './Logger': 12, events: 45 },
-        ],
-        12: [
-            function (require, module, exports) {
-                'use strict';
-                Object.defineProperty(exports, '__esModule', { value: true });
-                const debug_1 = require('debug');
-                const APP_NAME = 'mediasoup-client';
-                class Logger {
-                    constructor(prefix) {
-                        if (prefix) {
-                            this._debug = debug_1.default(`${APP_NAME}:${prefix}`);
-                            this._warn = debug_1.default(`${APP_NAME}:WARN:${prefix}`);
-                            this._error = debug_1.default(`${APP_NAME}:ERROR:${prefix}`);
-                        } else {
-                            this._debug = debug_1.default(APP_NAME);
-                            this._warn = debug_1.default(`${APP_NAME}:WARN`);
-                            this._error = debug_1.default(`${APP_NAME}:ERROR`);
-                        }
-                        /* eslint-disable no-console */
-                        this._debug.log = console.info.bind(console);
-                        this._warn.log = console.warn.bind(console);
-                        this._error.log = console.error.bind(console);
-                        /* eslint-enable no-console */
-                    }
-                    get debug() {
-                        return this._debug;
-                    }
-                    get warn() {
-                        return this._warn;
-                    }
-                    get error() {
-                        return this._error;
-                    }
-                }
-                exports.Logger = Logger;
-            },
-            { debug: 37 },
-        ],
-        13: [
-            function (require, module, exports) {
-                'use strict';
-                Object.defineProperty(exports, '__esModule', { value: true });
-                const Logger_1 = require('./Logger');
-                const EnhancedEventEmitter_1 = require('./EnhancedEventEmitter');
-                const errors_1 = require('./errors');
-                const logger = new Logger_1.Logger('Producer');
-                class Producer extends EnhancedEventEmitter_1.EnhancedEventEmitter {
-                    /**
-                     * @emits transportclose
-                     * @emits trackended
-                     * @emits @replacetrack - (track: MediaStreamTrack | null)
-                     * @emits @setmaxspatiallayer - (spatialLayer: string)
-                     * @emits @setrtpencodingparameters - (params: any)
-                     * @emits @getstats
-                     * @emits @close
-                     */
-                    constructor({
-                        id,
-                        localId,
-                        rtpSender,
-                        track,
-                        rtpParameters,
-                        stopTracks,
-                        disableTrackOnPause,
-                        zeroRtpOnPause,
-                        appData,
-                    }) {
-                        super();
-                        // Closed flag.
-                        this._closed = false;
-                        logger.debug('constructor()');
-                        this._id = id;
-                        this._localId = localId;
-                        this._rtpSender = rtpSender;
-                        this._track = track;
-                        this._kind = track.kind;
-                        this._rtpParameters = rtpParameters;
-                        this._paused = disableTrackOnPause ? !track.enabled : false;
-                        this._maxSpatialLayer = undefined;
-                        this._stopTracks = stopTracks;
-                        this._disableTrackOnPause = disableTrackOnPause;
-                        this._zeroRtpOnPause = zeroRtpOnPause;
-                        this._appData = appData;
-                        this._onTrackEnded = this._onTrackEnded.bind(this);
-                        // NOTE: Minor issue. If zeroRtpOnPause is true, we cannot emit the
-                        // '@replacetrack' event here, so RTCRtpSender.track won't be null.
-                        this._handleTrack();
-                    }
-                    /**
-                     * Producer id.
-                     */
-                    get id() {
-                        return this._id;
-                    }
-                    /**
-                     * Local id.
-                     */
-                    get localId() {
-                        return this._localId;
-                    }
-                    /**
-                     * Whether the Producer is closed.
-                     */
-                    get closed() {
-                        return this._closed;
-                    }
-                    /**
-                     * Media kind.
-                     */
-                    get kind() {
-                        return this._kind;
-                    }
-                    /**
-                     * Associated RTCRtpSender.
-                     */
-                    get rtpSender() {
-                        return this._rtpSender;
-                    }
-                    /**
-                     * The associated track.
-                     */
-                    get track() {
-                        return this._track;
-                    }
-                    /**
-                     * RTP parameters.
-                     */
-                    get rtpParameters() {
-                        return this._rtpParameters;
-                    }
-                    /**
-                     * Whether the Producer is paused.
-                     */
-                    get paused() {
-                        return this._paused;
-                    }
-                    /**
-                     * Max spatial layer.
-                     *
-                     * @type {Number | undefined}
-                     */
-                    get maxSpatialLayer() {
-                        return this._maxSpatialLayer;
-                    }
-                    /**
-                     * App custom data.
-                     */
-                    get appData() {
-                        return this._appData;
-                    }
-                    /**
-                     * Invalid setter.
-                     */
-                    set appData(appData) {
-                        throw new Error('cannot override appData object');
-                    }
-                    /**
-                     * Closes the Producer.
-                     */
-                    close() {
-                        if (this._closed) return;
-                        logger.debug('close()');
-                        this._closed = true;
-                        this._destroyTrack();
-                        this.emit('@close');
-                    }
-                    /**
-                     * Transport was closed.
-                     */
-                    transportClosed() {
-                        if (this._closed) return;
-                        logger.debug('transportClosed()');
-                        this._closed = true;
-                        this._destroyTrack();
-                        this.safeEmit('transportclose');
-                    }
-                    /**
-                     * Get associated RTCRtpSender stats.
-                     */
-                    async getStats() {
-                        if (this._closed) throw new errors_1.InvalidStateError('closed');
-                        return this.safeEmitAsPromise('@getstats');
-                    }
-                    /**
-                     * Pauses sending media.
-                     */
-                    pause() {
-                        logger.debug('pause()');
-                        if (this._closed) {
-                            logger.error('pause() | Producer closed');
-                            return;
-                        }
-                        this._paused = true;
-                        if (this._track && this._disableTrackOnPause) {
-                            this._track.enabled = false;
-                        }
-                        if (this._zeroRtpOnPause) {
-                            this.safeEmitAsPromise('@replacetrack', null).catch(() => {});
-                        }
-                    }
-                    /**
-                     * Resumes sending media.
-                     */
-                    resume() {
-                        logger.debug('resume()');
-                        if (this._closed) {
-                            logger.error('resume() | Producer closed');
-                            return;
-                        }
-                        this._paused = false;
-                        if (this._track && this._disableTrackOnPause) {
-                            this._track.enabled = true;
-                        }
-                        if (this._zeroRtpOnPause) {
-                            this.safeEmitAsPromise('@replacetrack', this._track).catch(() => {});
-                        }
-                    }
-                    /**
-                     * Replaces the current track with a new one or null.
-                     */
-                    async replaceTrack({ track }) {
-                        logger.debug('replaceTrack() [track:%o]', track);
-                        if (this._closed) {
-                            // This must be done here. Otherwise there is no chance to stop the given
-                            // track.
-                            if (track && this._stopTracks) {
-                                try {
-                                    track.stop();
-                                } catch (error) {}
-                            }
-                            throw new errors_1.InvalidStateError('closed');
-                        } else if (track && track.readyState === 'ended') {
-                            throw new errors_1.InvalidStateError('track ended');
-                        }
-                        // Do nothing if this is the same track as the current handled one.
-                        if (track === this._track) {
-                            logger.debug('replaceTrack() | same track, ignored');
-                            return;
-                        }
-                        if (!this._zeroRtpOnPause || !this._paused) {
-                            await this.safeEmitAsPromise('@replacetrack', track);
-                        }
-                        // Destroy the previous track.
-                        this._destroyTrack();
-                        // Set the new track.
-                        this._track = track;
-                        // If this Producer was paused/resumed and the state of the new
-                        // track does not match, fix it.
-                        if (this._track && this._disableTrackOnPause) {
-                            if (!this._paused) this._track.enabled = true;
-                            else if (this._paused) this._track.enabled = false;
-                        }
-                        // Handle the effective track.
-                        this._handleTrack();
-                    }
-                    /**
-                     * Sets the video max spatial layer to be sent.
-                     */
-                    async setMaxSpatialLayer(spatialLayer) {
-                        if (this._closed) throw new errors_1.InvalidStateError('closed');
-                        else if (this._kind !== 'video') throw new errors_1.UnsupportedError('not a video Producer');
-                        else if (typeof spatialLayer !== 'number') throw new TypeError('invalid spatialLayer');
-                        if (spatialLayer === this._maxSpatialLayer) return;
-                        await this.safeEmitAsPromise('@setmaxspatiallayer', spatialLayer);
-                        this._maxSpatialLayer = spatialLayer;
-                    }
-                    /**
-                     * Sets the DSCP value.
-                     */
-                    async setRtpEncodingParameters(params) {
-                        if (this._closed) throw new errors_1.InvalidStateError('closed');
-                        else if (typeof params !== 'object') throw new TypeError('invalid params');
-                        await this.safeEmitAsPromise('@setrtpencodingparameters', params);
-                    }
-                    _onTrackEnded() {
-                        logger.debug('track "ended" event');
-                        this.safeEmit('trackended');
-                    }
-                    _handleTrack() {
-                        if (!this._track) return;
-                        this._track.addEventListener('ended', this._onTrackEnded);
-                    }
-                    _destroyTrack() {
-                        if (!this._track) return;
-                        try {
-                            this._track.removeEventListener('ended', this._onTrackEnded);
-                            // Just stop the track unless the app set stopTracks: false.
-                            if (this._stopTracks) this._track.stop();
-                        } catch (error) {}
-                    }
-                }
-                exports.Producer = Producer;
-            },
-            { './EnhancedEventEmitter': 11, './Logger': 12, './errors': 15 },
-        ],
-        14: [
-            function (require, module, exports) {
-                'use strict';
-                Object.defineProperty(exports, '__esModule', { value: true });
-                const awaitqueue_1 = require('awaitqueue');
-                const Logger_1 = require('./Logger');
-                const EnhancedEventEmitter_1 = require('./EnhancedEventEmitter');
-                const errors_1 = require('./errors');
-                const utils = require('./utils');
-                const ortc = require('./ortc');
-                const Producer_1 = require('./Producer');
-                const Consumer_1 = require('./Consumer');
-                const DataProducer_1 = require('./DataProducer');
-                const DataConsumer_1 = require('./DataConsumer');
-                const logger = new Logger_1.Logger('Transport');
-                class Transport extends EnhancedEventEmitter_1.EnhancedEventEmitter {
-                    /**
-                     * @emits connect - (transportLocalParameters: any, callback: Function, errback: Function)
-                     * @emits connectionstatechange - (connectionState: ConnectionState)
-                     * @emits produce - (producerLocalParameters: any, callback: Function, errback: Function)
-                     * @emits producedata - (dataProducerLocalParameters: any, callback: Function, errback: Function)
-                     */
-                    constructor({
-                        direction,
-                        id,
-                        iceParameters,
-                        iceCandidates,
-                        dtlsParameters,
-                        sctpParameters,
-                        iceServers,
-                        iceTransportPolicy,
-                        additionalSettings,
-                        proprietaryConstraints,
-                        appData,
-                        handlerFactory,
-                        extendedRtpCapabilities,
-                        canProduceByKind,
-                    }) {
-                        super();
-                        // Closed flag.
-                        this._closed = false;
-                        // Transport connection state.
-                        this._connectionState = 'new';
-                        // Map of Producers indexed by id.
-                        this._producers = new Map();
-                        // Map of Consumers indexed by id.
-                        this._consumers = new Map();
-                        // Map of DataProducers indexed by id.
-                        this._dataProducers = new Map();
-                        // Map of DataConsumers indexed by id.
-                        this._dataConsumers = new Map();
-                        // Whether the Consumer for RTP probation has been created.
-                        this._probatorConsumerCreated = false;
-                        // AwaitQueue instance to make async tasks happen sequentially.
-                        this._awaitQueue = new awaitqueue_1.AwaitQueue({
-                            ClosedErrorClass: errors_1.InvalidStateError,
-                        });
-                        logger.debug('constructor() [id:%s, direction:%s]', id, direction);
-                        this._id = id;
-                        this._direction = direction;
-                        this._extendedRtpCapabilities = extendedRtpCapabilities;
-                        this._canProduceByKind = canProduceByKind;
-                        this._maxSctpMessageSize = sctpParameters ? sctpParameters.maxMessageSize : null;
-                        // Clone and sanitize additionalSettings.
-                        additionalSettings = utils.clone(additionalSettings);
-                        delete additionalSettings.iceServers;
-                        delete additionalSettings.iceTransportPolicy;
-                        delete additionalSettings.bundlePolicy;
-                        delete additionalSettings.rtcpMuxPolicy;
-                        delete additionalSettings.sdpSemantics;
-                        this._handler = handlerFactory();
-                        this._handler.run({
-                            direction,
-                            iceParameters,
-                            iceCandidates,
-                            dtlsParameters,
-                            sctpParameters,
-                            iceServers,
-                            iceTransportPolicy,
-                            additionalSettings,
-                            proprietaryConstraints,
-                            extendedRtpCapabilities,
-                        });
-                        this._appData = appData;
-                        this._handleHandler();
-                    }
-                    /**
-                     * Transport id.
-                     */
-                    get id() {
-                        return this._id;
-                    }
-                    /**
-                     * Whether the Transport is closed.
-                     */
-                    get closed() {
-                        return this._closed;
-                    }
-                    /**
-                     * Transport direction.
-                     */
-                    get direction() {
-                        return this._direction;
-                    }
-                    /**
-                     * RTC handler instance.
-                     */
-                    get handler() {
-                        return this._handler;
-                    }
-                    /**
-                     * Connection state.
-                     */
-                    get connectionState() {
-                        return this._connectionState;
-                    }
-                    /**
-                     * App custom data.
-                     */
-                    get appData() {
-                        return this._appData;
-                    }
-                    /**
-                     * Invalid setter.
-                     */
-                    set appData(appData) {
-                        throw new Error('cannot override appData object');
-                    }
-                    /**
-                     * Close the Transport.
-                     */
-                    close() {
-                        if (this._closed) return;
-                        logger.debug('close()');
-                        this._closed = true;
-                        // Close the AwaitQueue.
-                        this._awaitQueue.close();
-                        // Close the handler.
-                        this._handler.close();
-                        // Close all Producers.
-                        for (const producer of this._producers.values()) {
-                            producer.transportClosed();
-                        }
-                        this._producers.clear();
-                        // Close all Consumers.
-                        for (const consumer of this._consumers.values()) {
-                            consumer.transportClosed();
-                        }
-                        this._consumers.clear();
-                        // Close all DataProducers.
-                        for (const dataProducer of this._dataProducers.values()) {
-                            dataProducer.transportClosed();
-                        }
-                        this._dataProducers.clear();
-                        // Close all DataConsumers.
-                        for (const dataConsumer of this._dataConsumers.values()) {
-                            dataConsumer.transportClosed();
-                        }
-                        this._dataConsumers.clear();
-                    }
-                    /**
-                     * Get associated Transport (RTCPeerConnection) stats.
-                     *
-                     * @returns {RTCStatsReport}
-                     */
-                    async getStats() {
-                        if (this._closed) throw new errors_1.InvalidStateError('closed');
-                        return this._handler.getTransportStats();
-                    }
-                    /**
-                     * Restart ICE connection.
-                     */
-                    async restartIce({ iceParameters }) {
-                        logger.debug('restartIce()');
-                        if (this._closed) throw new errors_1.InvalidStateError('closed');
-                        else if (!iceParameters) throw new TypeError('missing iceParameters');
-                        // Enqueue command.
-                        return this._awaitQueue.push(async () => this._handler.restartIce(iceParameters));
-                    }
-                    /**
-                     * Update ICE servers.
-                     */
-                    async updateIceServers({ iceServers } = {}) {
-                        logger.debug('updateIceServers()');
-                        if (this._closed) throw new errors_1.InvalidStateError('closed');
-                        else if (!Array.isArray(iceServers)) throw new TypeError('missing iceServers');
-                        // Enqueue command.
-                        return this._awaitQueue.push(async () => this._handler.updateIceServers(iceServers));
-                    }
-                    /**
-                     * Create a Producer.
-                     */
-                    async produce({
-                        track,
-                        encodings,
-                        codecOptions,
-                        codec,
-                        stopTracks = true,
-                        disableTrackOnPause = true,
-                        zeroRtpOnPause = false,
-                        appData = {},
-                    } = {}) {
-                        logger.debug('produce() [track:%o]', track);
-                        if (!track) throw new TypeError('missing track');
-                        else if (this._direction !== 'send')
-                            throw new errors_1.UnsupportedError('not a sending Transport');
-                        else if (!this._canProduceByKind[track.kind])
-                            throw new errors_1.UnsupportedError(`cannot produce ${track.kind}`);
-                        else if (track.readyState === 'ended') throw new errors_1.InvalidStateError('track ended');
-                        else if (this.listenerCount('connect') === 0 && this._connectionState === 'new')
-                            throw new TypeError('no "connect" listener set into this transport');
-                        else if (this.listenerCount('produce') === 0)
-                            throw new TypeError('no "produce" listener set into this transport');
-                        else if (appData && typeof appData !== 'object')
-                            throw new TypeError('if given, appData must be an object');
-                        // Enqueue command.
-                        return (
-                            this._awaitQueue
-                                .push(async () => {
-                                    let normalizedEncodings;
-                                    if (encodings && !Array.isArray(encodings)) {
-                                        throw TypeError('encodings must be an array');
-                                    } else if (encodings && encodings.length === 0) {
-                                        normalizedEncodings = undefined;
-                                    } else if (encodings) {
-                                        normalizedEncodings = encodings.map((encoding) => {
-                                            const normalizedEncoding = { active: true };
-                                            if (encoding.active === false) normalizedEncoding.active = false;
-                                            if (typeof encoding.dtx === 'boolean')
-                                                normalizedEncoding.dtx = encoding.dtx;
-                                            if (typeof encoding.scalabilityMode === 'string')
-                                                normalizedEncoding.scalabilityMode = encoding.scalabilityMode;
-                                            if (typeof encoding.scaleResolutionDownBy === 'number')
-                                                normalizedEncoding.scaleResolutionDownBy =
-                                                    encoding.scaleResolutionDownBy;
-                                            if (typeof encoding.maxBitrate === 'number')
-                                                normalizedEncoding.maxBitrate = encoding.maxBitrate;
-                                            if (typeof encoding.maxFramerate === 'number')
-                                                normalizedEncoding.maxFramerate = encoding.maxFramerate;
-                                            if (typeof encoding.adaptivePtime === 'boolean')
-                                                normalizedEncoding.adaptivePtime = encoding.adaptivePtime;
-                                            if (typeof encoding.priority === 'string')
-                                                normalizedEncoding.priority = encoding.priority;
-                                            if (typeof encoding.networkPriority === 'string')
-                                                normalizedEncoding.networkPriority = encoding.networkPriority;
-                                            return normalizedEncoding;
-                                        });
-                                    }
-                                    const { localId, rtpParameters, rtpSender } = await this._handler.send({
-                                        track,
-                                        encodings: normalizedEncodings,
-                                        codecOptions,
-                                        codec,
-                                    });
-                                    try {
-                                        // This will fill rtpParameters's missing fields with default values.
-                                        ortc.validateRtpParameters(rtpParameters);
-                                        const { id } = await this.safeEmitAsPromise('produce', {
-                                            kind: track.kind,
-                                            rtpParameters,
-                                            appData,
-                                        });
-                                        const producer = new Producer_1.Producer({
-                                            id,
-                                            localId,
-                                            rtpSender,
-                                            track,
-                                            rtpParameters,
-                                            stopTracks,
-                                            disableTrackOnPause,
-                                            zeroRtpOnPause,
-                                            appData,
-                                        });
-                                        this._producers.set(producer.id, producer);
-                                        this._handleProducer(producer);
-                                        return producer;
-                                    } catch (error) {
-                                        this._handler.stopSending(localId).catch(() => {});
-                                        throw error;
-                                    }
-                                })
-                                // This catch is needed to stop the given track if the command above
-                                // failed due to closed Transport.
-                                .catch((error) => {
-                                    if (stopTracks) {
-                                        try {
-                                            track.stop();
-                                        } catch (error2) {}
-                                    }
-                                    throw error;
-                                })
-                        );
-                    }
-                    /**
-                     * Create a Consumer to consume a remote Producer.
-                     */
-                    async consume({ id, producerId, kind, rtpParameters, appData = {} }) {
-                        logger.debug('consume()');
-                        if (this._closed) throw new errors_1.InvalidStateError('closed');
-                        else if (this._direction !== 'recv')
-                            throw new errors_1.UnsupportedError('not a receiving Transport');
-                        else if (typeof id !== 'string') throw new TypeError('missing id');
-                        else if (typeof producerId !== 'string') throw new TypeError('missing producerId');
-                        else if (kind !== 'audio' && kind !== 'video') throw new TypeError(`invalid kind '${kind}'`);
-                        else if (this.listenerCount('connect') === 0 && this._connectionState === 'new')
-                            throw new TypeError('no "connect" listener set into this transport');
-                        else if (appData && typeof appData !== 'object')
-                            throw new TypeError('if given, appData must be an object');
-                        // Enqueue command.
-                        return this._awaitQueue.push(async () => {
-                            // Ensure the device can consume it.
-                            const canConsume = ortc.canReceive(rtpParameters, this._extendedRtpCapabilities);
-                            if (!canConsume) throw new errors_1.UnsupportedError('cannot consume this Producer');
-                            const { localId, rtpReceiver, track } = await this._handler.receive({
-                                trackId: id,
-                                kind,
-                                rtpParameters,
-                            });
-                            const consumer = new Consumer_1.Consumer({
-                                id,
-                                localId,
-                                producerId,
-                                rtpReceiver,
-                                track,
-                                rtpParameters,
-                                appData,
-                            });
-                            this._consumers.set(consumer.id, consumer);
-                            this._handleConsumer(consumer);
-                            // If this is the first video Consumer and the Consumer for RTP probation
-                            // has not yet been created, create it now.
-                            if (!this._probatorConsumerCreated && kind === 'video') {
-                                try {
-                                    const probatorRtpParameters = ortc.generateProbatorRtpParameters(
-                                        consumer.rtpParameters,
-                                    );
-                                    await this._handler.receive({
-                                        trackId: 'probator',
-                                        kind: 'video',
-                                        rtpParameters: probatorRtpParameters,
-                                    });
-                                    logger.debug('consume() | Consumer for RTP probation created');
-                                    this._probatorConsumerCreated = true;
-                                } catch (error) {
-                                    logger.error('consume() | failed to create Consumer for RTP probation:%o', error);
-                                }
-                            }
-                            return consumer;
-                        });
-                    }
-                    /**
-                     * Create a DataProducer
-                     */
-                    async produceData({
-                        ordered = true,
-                        maxPacketLifeTime,
-                        maxRetransmits,
-                        priority = 'low',
-                        label = '',
-                        protocol = '',
-                        appData = {},
-                    } = {}) {
-                        logger.debug('produceData()');
-                        if (this._direction !== 'send') throw new errors_1.UnsupportedError('not a sending Transport');
-                        else if (!this._maxSctpMessageSize)
-                            throw new errors_1.UnsupportedError('SCTP not enabled by remote Transport');
-                        else if (!['very-low', 'low', 'medium', 'high'].includes(priority))
-                            throw new TypeError('wrong priority');
-                        else if (this.listenerCount('connect') === 0 && this._connectionState === 'new')
-                            throw new TypeError('no "connect" listener set into this transport');
-                        else if (this.listenerCount('producedata') === 0)
-                            throw new TypeError('no "producedata" listener set into this transport');
-                        else if (appData && typeof appData !== 'object')
-                            throw new TypeError('if given, appData must be an object');
-                        if (maxPacketLifeTime || maxRetransmits) ordered = false;
-                        // Enqueue command.
-                        return this._awaitQueue.push(async () => {
-                            const { dataChannel, sctpStreamParameters } = await this._handler.sendDataChannel({
-                                ordered,
-                                maxPacketLifeTime,
-                                maxRetransmits,
-                                priority,
-                                label,
-                                protocol,
-                            });
-                            // This will fill sctpStreamParameters's missing fields with default values.
-                            ortc.validateSctpStreamParameters(sctpStreamParameters);
-                            const { id } = await this.safeEmitAsPromise('producedata', {
-                                sctpStreamParameters,
-                                label,
-                                protocol,
-                                appData,
-                            });
-                            const dataProducer = new DataProducer_1.DataProducer({
-                                id,
-                                dataChannel,
-                                sctpStreamParameters,
-                                appData,
-                            });
-                            this._dataProducers.set(dataProducer.id, dataProducer);
-                            this._handleDataProducer(dataProducer);
-                            return dataProducer;
-                        });
-                    }
-                    /**
-                     * Create a DataConsumer
-                     */
-                    async consumeData({
-                        id,
-                        dataProducerId,
-                        sctpStreamParameters,
-                        label = '',
-                        protocol = '',
-                        appData = {},
-                    }) {
-                        logger.debug('consumeData()');
-                        if (this._closed) throw new errors_1.InvalidStateError('closed');
-                        else if (this._direction !== 'recv')
-                            throw new errors_1.UnsupportedError('not a receiving Transport');
-                        else if (!this._maxSctpMessageSize)
-                            throw new errors_1.UnsupportedError('SCTP not enabled by remote Transport');
-                        else if (typeof id !== 'string') throw new TypeError('missing id');
-                        else if (typeof dataProducerId !== 'string') throw new TypeError('missing dataProducerId');
-                        else if (this.listenerCount('connect') === 0 && this._connectionState === 'new')
-                            throw new TypeError('no "connect" listener set into this transport');
-                        else if (appData && typeof appData !== 'object')
-                            throw new TypeError('if given, appData must be an object');
-                        // This may throw.
-                        ortc.validateSctpStreamParameters(sctpStreamParameters);
-                        // Enqueue command.
-                        return this._awaitQueue.push(async () => {
-                            const { dataChannel } = await this._handler.receiveDataChannel({
-                                sctpStreamParameters,
-                                label,
-                                protocol,
-                            });
-                            const dataConsumer = new DataConsumer_1.DataConsumer({
-                                id,
-                                dataProducerId,
-                                dataChannel,
-                                sctpStreamParameters,
-                                appData,
-                            });
-                            this._dataConsumers.set(dataConsumer.id, dataConsumer);
-                            this._handleDataConsumer(dataConsumer);
-                            return dataConsumer;
-                        });
-                    }
-                    _handleHandler() {
-                        const handler = this._handler;
-                        handler.on('@connect', ({ dtlsParameters }, callback, errback) => {
-                            if (this._closed) {
-                                errback(new errors_1.InvalidStateError('closed'));
-                                return;
-                            }
-                            this.safeEmit('connect', { dtlsParameters }, callback, errback);
-                        });
-                        handler.on('@connectionstatechange', (connectionState) => {
-                            if (connectionState === this._connectionState) return;
-                            logger.debug('connection state changed to %s', connectionState);
-                            this._connectionState = connectionState;
-                            if (!this._closed) this.safeEmit('connectionstatechange', connectionState);
-                        });
-                    }
-                    _handleProducer(producer) {
-                        producer.on('@close', () => {
-                            this._producers.delete(producer.id);
-                            if (this._closed) return;
-                            this._awaitQueue
-                                .push(async () => this._handler.stopSending(producer.localId))
-                                .catch((error) => logger.warn('producer.close() failed:%o', error));
-                        });
-                        producer.on('@replacetrack', (track, callback, errback) => {
-                            this._awaitQueue
-                                .push(async () => this._handler.replaceTrack(producer.localId, track))
-                                .then(callback)
-                                .catch(errback);
-                        });
-                        producer.on('@setmaxspatiallayer', (spatialLayer, callback, errback) => {
-                            this._awaitQueue
-                                .push(async () => this._handler.setMaxSpatialLayer(producer.localId, spatialLayer))
-                                .then(callback)
-                                .catch(errback);
-                        });
-                        producer.on('@setrtpencodingparameters', (params, callback, errback) => {
-                            this._awaitQueue
-                                .push(async () => this._handler.setRtpEncodingParameters(producer.localId, params))
-                                .then(callback)
-                                .catch(errback);
-                        });
-                        producer.on('@getstats', (callback, errback) => {
-                            if (this._closed) return errback(new errors_1.InvalidStateError('closed'));
-                            this._handler.getSenderStats(producer.localId).then(callback).catch(errback);
-                        });
-                    }
-                    _handleConsumer(consumer) {
-                        consumer.on('@close', () => {
-                            this._consumers.delete(consumer.id);
-                            if (this._closed) return;
-                            this._awaitQueue
-                                .push(async () => this._handler.stopReceiving(consumer.localId))
-                                .catch(() => {});
-                        });
-                        consumer.on('@getstats', (callback, errback) => {
-                            if (this._closed) return errback(new errors_1.InvalidStateError('closed'));
-                            this._handler.getReceiverStats(consumer.localId).then(callback).catch(errback);
-                        });
-                    }
-                    _handleDataProducer(dataProducer) {
-                        dataProducer.on('@close', () => {
-                            this._dataProducers.delete(dataProducer.id);
-                        });
-                    }
-                    _handleDataConsumer(dataConsumer) {
-                        dataConsumer.on('@close', () => {
-                            this._dataConsumers.delete(dataConsumer.id);
-                        });
-                    }
-                }
-                exports.Transport = Transport;
-            },
+            }
+            // Emit observer event.
+            this._observer.safeEmit('newconsumer', consumer);
+            return consumer;
+        }, 'transport.consume()');
+    }
+    /**
+     * Create a DataProducer
+     */
+    async produceData({ ordered = true, maxPacketLifeTime, maxRetransmits, label = '', protocol = '', appData = {} } = {}) {
+        logger.debug('produceData()');
+        if (this._direction !== 'send')
+            throw new errors_1.UnsupportedError('not a sending Transport');
+        else if (!this._maxSctpMessageSize)
+            throw new errors_1.UnsupportedError('SCTP not enabled by remote Transport');
+        else if (this.listenerCount('connect') === 0 && this._connectionState === 'new')
+            throw new TypeError('no "connect" listener set into this transport');
+        else if (this.listenerCount('producedata') === 0)
+            throw new TypeError('no "producedata" listener set into this transport');
+        else if (appData && typeof appData !== 'object')
+            throw new TypeError('if given, appData must be an object');
+        if (maxPacketLifeTime || maxRetransmits)
+            ordered = false;
+        // Enqueue command.
+        return this._awaitQueue.push(async () => {
+            const { dataChannel, sctpStreamParameters } = await this._handler.sendDataChannel({
+                ordered,
+                maxPacketLifeTime,
+                maxRetransmits,
+                label,
+                protocol
+            });
+            // This will fill sctpStreamParameters's missing fields with default values.
+            ortc.validateSctpStreamParameters(sctpStreamParameters);
+            const { id } = await this.safeEmitAsPromise('producedata', {
+                sctpStreamParameters,
+                label,
+                protocol,
+                appData
+            });
+            const dataProducer = new DataProducer_1.DataProducer({ id, dataChannel, sctpStreamParameters, appData });
+            this._dataProducers.set(dataProducer.id, dataProducer);
+            this._handleDataProducer(dataProducer);
+            // Emit observer event.
+            this._observer.safeEmit('newdataproducer', dataProducer);
+            return dataProducer;
+        }, 'transport.produceData()');
+    }
+    /**
+     * Create a DataConsumer
+     */
+    async consumeData({ id, dataProducerId, sctpStreamParameters, label = '', protocol = '', appData = {} }) {
+        logger.debug('consumeData()');
+        sctpStreamParameters = utils.clone(sctpStreamParameters, undefined);
+        if (this._closed)
+            throw new errors_1.InvalidStateError('closed');
+        else if (this._direction !== 'recv')
+            throw new errors_1.UnsupportedError('not a receiving Transport');
+        else if (!this._maxSctpMessageSize)
+            throw new errors_1.UnsupportedError('SCTP not enabled by remote Transport');
+        else if (typeof id !== 'string')
+            throw new TypeError('missing id');
+        else if (typeof dataProducerId !== 'string')
+            throw new TypeError('missing dataProducerId');
+        else if (this.listenerCount('connect') === 0 && this._connectionState === 'new')
+            throw new TypeError('no "connect" listener set into this transport');
+        else if (appData && typeof appData !== 'object')
+            throw new TypeError('if given, appData must be an object');
+        // This may throw.
+        ortc.validateSctpStreamParameters(sctpStreamParameters);
+        // Enqueue command.
+        return this._awaitQueue.push(async () => {
+            const { dataChannel } = await this._handler.receiveDataChannel({
+                sctpStreamParameters,
+                label,
+                protocol
+            });
+            const dataConsumer = new DataConsumer_1.DataConsumer({
+                id,
+                dataProducerId,
+                dataChannel,
+                sctpStreamParameters,
+                appData
+            });
+            this._dataConsumers.set(dataConsumer.id, dataConsumer);
+            this._handleDataConsumer(dataConsumer);
+            // Emit observer event.
+            this._observer.safeEmit('newdataconsumer', dataConsumer);
+            return dataConsumer;
+        }, 'transport.consumeData()');
+    }
+    _handleHandler() {
+        const handler = this._handler;
+        handler.on('@connect', ({ dtlsParameters }, callback, errback) => {
+            if (this._closed) {
+                errback(new errors_1.InvalidStateError('closed'));
+                return;
+            }
+            this.safeEmit('connect', { dtlsParameters }, callback, errback);
+        });
+        handler.on('@connectionstatechange', (connectionState) => {
+            if (connectionState === this._connectionState)
+                return;
+            logger.debug('connection state changed to %s', connectionState);
+            this._connectionState = connectionState;
+            if (!this._closed)
+                this.safeEmit('connectionstatechange', connectionState);
+        });
+    }
+    _handleProducer(producer) {
+        producer.on('@close', () => {
+            this._producers.delete(producer.id);
+            if (this._closed)
+                return;
+            this._awaitQueue.push(async () => this._handler.stopSending(producer.localId), 'producer @close event')
+                .catch((error) => logger.warn('producer.close() failed:%o', error));
+        });
+        producer.on('@replacetrack', (track, callback, errback) => {
+            this._awaitQueue.push(async () => this._handler.replaceTrack(producer.localId, track), 'producer @replacetrack event')
+                .then(callback)
+                .catch(errback);
+        });
+        producer.on('@setmaxspatiallayer', (spatialLayer, callback, errback) => {
+            this._awaitQueue.push(async () => (this._handler.setMaxSpatialLayer(producer.localId, spatialLayer)), 'producer @setmaxspatiallayer event')
+                .then(callback)
+                .catch(errback);
+        });
+        producer.on('@setrtpencodingparameters', (params, callback, errback) => {
+            this._awaitQueue.push(async () => (this._handler.setRtpEncodingParameters(producer.localId, params)), 'producer @setrtpencodingparameters event')
+                .then(callback)
+                .catch(errback);
+        });
+        producer.on('@getstats', (callback, errback) => {
+            if (this._closed)
+                return errback(new errors_1.InvalidStateError('closed'));
+            this._handler.getSenderStats(producer.localId)
+                .then(callback)
+                .catch(errback);
+        });
+    }
+    _handleConsumer(consumer) {
+        consumer.on('@close', () => {
+            this._consumers.delete(consumer.id);
+            if (this._closed)
+                return;
+            this._awaitQueue.push(async () => this._handler.stopReceiving(consumer.localId), 'consumer @close event')
+                .catch(() => { });
+        });
+        consumer.on('@getstats', (callback, errback) => {
+            if (this._closed)
+                return errback(new errors_1.InvalidStateError('closed'));
+            this._handler.getReceiverStats(consumer.localId)
+                .then(callback)
+                .catch(errback);
+        });
+    }
+    _handleDataProducer(dataProducer) {
+        dataProducer.on('@close', () => {
+            this._dataProducers.delete(dataProducer.id);
+        });
+    }
+    _handleDataConsumer(dataConsumer) {
+        dataConsumer.on('@close', () => {
+            this._dataConsumers.delete(dataConsumer.id);
+        });
+    }
+}
+exports.Transport = Transport;
+
+},{"./Consumer":8,"./DataConsumer":9,"./DataProducer":10,"./EnhancedEventEmitter":12,"./Logger":13,"./Producer":14,"./errors":18,"./ortc":36,"./utils":39,"awaitqueue":2}],18:[function(require,module,exports){
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.InvalidStateError = exports.UnsupportedError = void 0;
+/**
+ * Error indicating not support for something.
+ */
+class UnsupportedError extends Error {
+    constructor(message) {
+        super(message);
+        this.name = 'UnsupportedError';
+        if (Error.hasOwnProperty('captureStackTrace')) // Just in V8.
+         {
+            // @ts-ignore
+            Error.captureStackTrace(this, UnsupportedError);
+        }
+        else {
+            this.stack = (new Error(message)).stack;
+        }
+    }
+}
+exports.UnsupportedError = UnsupportedError;
+/**
+ * Error produced when calling a method in an invalid state.
+ */
+class InvalidStateError extends Error {
+    constructor(message) {
+        super(message);
+        this.name = 'InvalidStateError';
+        if (Error.hasOwnProperty('captureStackTrace')) // Just in V8.
+         {
+            // @ts-ignore
+            Error.captureStackTrace(this, InvalidStateError);
+        }
+        else {
+            this.stack = (new Error(message)).stack;
+        }
+    }
+}
+exports.InvalidStateError = InvalidStateError;
+
+},{}],19:[function(require,module,exports){
+"use strict";
+var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
+}) : (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    o[k2] = m[k];
+}));
+var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
+    Object.defineProperty(o, "default", { enumerable: true, value: v });
+}) : function(o, v) {
+    o["default"] = v;
+});
+var __importStar = (this && this.__importStar) || function (mod) {
+    if (mod && mod.__esModule) return mod;
+    var result = {};
+    if (mod != null) for (var k in mod) if (k !== "default" && Object.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
+    __setModuleDefault(result, mod);
+    return result;
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.Chrome55 = void 0;
+const sdpTransform = __importStar(require("sdp-transform"));
+const Logger_1 = require("../Logger");
+const errors_1 = require("../errors");
+const utils = __importStar(require("../utils"));
+const ortc = __importStar(require("../ortc"));
+const sdpCommonUtils = __importStar(require("./sdp/commonUtils"));
+const sdpPlanBUtils = __importStar(require("./sdp/planBUtils"));
+const HandlerInterface_1 = require("./HandlerInterface");
+const RemoteSdp_1 = require("./sdp/RemoteSdp");
+const logger = new Logger_1.Logger('Chrome55');
+const SCTP_NUM_STREAMS = { OS: 1024, MIS: 1024 };
+class Chrome55 extends HandlerInterface_1.HandlerInterface {
+    constructor() {
+        super();
+        // Local stream for sending.
+        this._sendStream = new MediaStream();
+        // Map of sending MediaStreamTracks indexed by localId.
+        this._mapSendLocalIdTrack = new Map();
+        // Next sending localId.
+        this._nextSendLocalId = 0;
+        // Map of MID, RTP parameters and RTCRtpReceiver indexed by local id.
+        // Value is an Object with mid, rtpParameters and rtpReceiver.
+        this._mapRecvLocalIdInfo = new Map();
+        // Whether a DataChannel m=application section has been created.
+        this._hasDataChannelMediaSection = false;
+        // Sending DataChannel id value counter. Incremented for each new DataChannel.
+        this._nextSendSctpStreamId = 0;
+        // Got transport local and remote parameters.
+        this._transportReady = false;
+    }
+    /**
+     * Creates a factory function.
+     */
+    static createFactory() {
+        return () => new Chrome55();
+    }
+    get name() {
+        return 'Chrome55';
+    }
+    close() {
+        logger.debug('close()');
+        // Close RTCPeerConnection.
+        if (this._pc) {
+            try {
+                this._pc.close();
+            }
+            catch (error) { }
+        }
+    }
+    async getNativeRtpCapabilities() {
+        logger.debug('getNativeRtpCapabilities()');
+        const pc = new RTCPeerConnection({
+            iceServers: [],
+            iceTransportPolicy: 'all',
+            bundlePolicy: 'max-bundle',
+            rtcpMuxPolicy: 'require',
+            sdpSemantics: 'plan-b'
+        });
+        try {
+            const offer = await pc.createOffer({
+                offerToReceiveAudio: true,
+                offerToReceiveVideo: true
+            });
+            try {
+                pc.close();
+            }
+            catch (error) { }
+            const sdpObject = sdpTransform.parse(offer.sdp);
+            const nativeRtpCapabilities = sdpCommonUtils.extractRtpCapabilities({ sdpObject });
+            return nativeRtpCapabilities;
+        }
+        catch (error) {
+            try {
+                pc.close();
+            }
+            catch (error2) { }
+            throw error;
+        }
+    }
+    async getNativeSctpCapabilities() {
+        logger.debug('getNativeSctpCapabilities()');
+        return {
+            numStreams: SCTP_NUM_STREAMS
+        };
+    }
+    run({ direction, iceParameters, iceCandidates, dtlsParameters, sctpParameters, iceServers, iceTransportPolicy, additionalSettings, proprietaryConstraints, extendedRtpCapabilities }) {
+        logger.debug('run()');
+        this._direction = direction;
+        this._remoteSdp = new RemoteSdp_1.RemoteSdp({
+            iceParameters,
+            iceCandidates,
+            dtlsParameters,
+            sctpParameters,
+            planB: true
+        });
+        this._sendingRtpParametersByKind =
             {
-                './Consumer': 7,
-                './DataConsumer': 8,
-                './DataProducer': 9,
-                './EnhancedEventEmitter': 11,
-                './Logger': 12,
-                './Producer': 13,
-                './errors': 15,
-                './ortc': 33,
-                './utils': 36,
-                awaitqueue: 1,
-            },
-        ],
-        15: [
-            function (require, module, exports) {
-                'use strict';
-                Object.defineProperty(exports, '__esModule', { value: true });
-                /**
-                 * Error indicating not support for something.
-                 */
-                class UnsupportedError extends Error {
-                    constructor(message) {
-                        super(message);
-                        this.name = 'UnsupportedError';
-                        if (Error.hasOwnProperty('captureStackTrace')) {
-                            // Just in V8.
-                            // @ts-ignore
-                            Error.captureStackTrace(this, UnsupportedError);
-                        } else {
-                            this.stack = new Error(message).stack;
-                        }
-                    }
-                }
-                exports.UnsupportedError = UnsupportedError;
-                /**
-                 * Error produced when calling a method in an invalid state.
-                 */
-                class InvalidStateError extends Error {
-                    constructor(message) {
-                        super(message);
-                        this.name = 'InvalidStateError';
-                        if (Error.hasOwnProperty('captureStackTrace')) {
-                            // Just in V8.
-                            // @ts-ignore
-                            Error.captureStackTrace(this, InvalidStateError);
-                        } else {
-                            this.stack = new Error(message).stack;
-                        }
-                    }
-                }
-                exports.InvalidStateError = InvalidStateError;
-            },
-            {},
-        ],
-        16: [
-            function (require, module, exports) {
-                'use strict';
-                Object.defineProperty(exports, '__esModule', { value: true });
-                const sdpTransform = require('sdp-transform');
-                const Logger_1 = require('../Logger');
-                const errors_1 = require('../errors');
-                const utils = require('../utils');
-                const ortc = require('../ortc');
-                const sdpCommonUtils = require('./sdp/commonUtils');
-                const sdpPlanBUtils = require('./sdp/planBUtils');
-                const HandlerInterface_1 = require('./HandlerInterface');
-                const RemoteSdp_1 = require('./sdp/RemoteSdp');
-                const logger = new Logger_1.Logger('Chrome55');
-                const SCTP_NUM_STREAMS = { OS: 1024, MIS: 1024 };
-                class Chrome55 extends HandlerInterface_1.HandlerInterface {
-                    constructor() {
-                        super();
-                        // Local stream for sending.
-                        this._sendStream = new MediaStream();
-                        // Map of sending MediaStreamTracks indexed by localId.
-                        this._mapSendLocalIdTrack = new Map();
-                        // Next sending localId.
-                        this._nextSendLocalId = 0;
-                        // Map of MID, RTP parameters and RTCRtpReceiver indexed by local id.
-                        // Value is an Object with mid, rtpParameters and rtpReceiver.
-                        this._mapRecvLocalIdInfo = new Map();
-                        // Whether a DataChannel m=application section has been created.
-                        this._hasDataChannelMediaSection = false;
-                        // Sending DataChannel id value counter. Incremented for each new DataChannel.
-                        this._nextSendSctpStreamId = 0;
-                        // Got transport local and remote parameters.
-                        this._transportReady = false;
-                    }
-                    /**
-                     * Creates a factory function.
-                     */
-                    static createFactory() {
-                        return () => new Chrome55();
-                    }
-                    get name() {
-                        return 'Chrome55';
-                    }
-                    close() {
-                        logger.debug('close()');
-                        // Close RTCPeerConnection.
-                        if (this._pc) {
-                            try {
-                                this._pc.close();
-                            } catch (error) {}
-                        }
-                    }
-                    async getNativeRtpCapabilities() {
-                        logger.debug('getNativeRtpCapabilities()');
-                        const pc = new RTCPeerConnection({
-                            iceServers: [],
-                            iceTransportPolicy: 'all',
-                            bundlePolicy: 'max-bundle',
-                            rtcpMuxPolicy: 'require',
-                            sdpSemantics: 'plan-b',
-                        });
-                        try {
-                            const offer = await pc.createOffer({
-                                offerToReceiveAudio: true,
-                                offerToReceiveVideo: true,
-                            });
-                            try {
-                                pc.close();
-                            } catch (error) {}
-                            const sdpObject = sdpTransform.parse(offer.sdp);
-                            const nativeRtpCapabilities = sdpCommonUtils.extractRtpCapabilities({ sdpObject });
-                            return nativeRtpCapabilities;
-                        } catch (error) {
-                            try {
-                                pc.close();
-                            } catch (error2) {}
-                            throw error;
-                        }
-                    }
-                    async getNativeSctpCapabilities() {
-                        logger.debug('getNativeSctpCapabilities()');
-                        return {
-                            numStreams: SCTP_NUM_STREAMS,
-                        };
-                    }
-                    run({
-                        direction,
-                        iceParameters,
-                        iceCandidates,
-                        dtlsParameters,
-                        sctpParameters,
-                        iceServers,
-                        iceTransportPolicy,
-                        additionalSettings,
-                        proprietaryConstraints,
-                        extendedRtpCapabilities,
-                    }) {
-                        logger.debug('run()');
-                        this._direction = direction;
-                        this._remoteSdp = new RemoteSdp_1.RemoteSdp({
-                            iceParameters,
-                            iceCandidates,
-                            dtlsParameters,
-                            sctpParameters,
-                            planB: true,
-                        });
-                        this._sendingRtpParametersByKind = {
-                            audio: ortc.getSendingRtpParameters('audio', extendedRtpCapabilities),
-                            video: ortc.getSendingRtpParameters('video', extendedRtpCapabilities),
-                        };
-                        this._sendingRemoteRtpParametersByKind = {
-                            audio: ortc.getSendingRemoteRtpParameters('audio', extendedRtpCapabilities),
-                            video: ortc.getSendingRemoteRtpParameters('video', extendedRtpCapabilities),
-                        };
-                        this._pc = new RTCPeerConnection(
-                            {
-                                iceServers: iceServers || [],
-                                iceTransportPolicy: iceTransportPolicy || 'all',
-                                bundlePolicy: 'max-bundle',
-                                rtcpMuxPolicy: 'require',
-                                sdpSemantics: 'plan-b',
-                                ...additionalSettings,
-                            },
-                            proprietaryConstraints,
-                        );
-                        // Handle RTCPeerConnection connection status.
-                        this._pc.addEventListener('iceconnectionstatechange', () => {
-                            switch (this._pc.iceConnectionState) {
-                                case 'checking':
-                                    this.emit('@connectionstatechange', 'connecting');
-                                    break;
-                                case 'connected':
-                                case 'completed':
-                                    this.emit('@connectionstatechange', 'connected');
-                                    break;
-                                case 'failed':
-                                    this.emit('@connectionstatechange', 'failed');
-                                    break;
-                                case 'disconnected':
-                                    this.emit('@connectionstatechange', 'disconnected');
-                                    break;
-                                case 'closed':
-                                    this.emit('@connectionstatechange', 'closed');
-                                    break;
-                            }
-                        });
-                    }
-                    async updateIceServers(iceServers) {
-                        logger.debug('updateIceServers()');
-                        const configuration = this._pc.getConfiguration();
-                        configuration.iceServers = iceServers;
-                        this._pc.setConfiguration(configuration);
-                    }
-                    async restartIce(iceParameters) {
-                        logger.debug('restartIce()');
-                        // Provide the remote SDP handler with new remote ICE parameters.
-                        this._remoteSdp.updateIceParameters(iceParameters);
-                        if (!this._transportReady) return;
-                        if (this._direction === 'send') {
-                            const offer = await this._pc.createOffer({ iceRestart: true });
-                            logger.debug('restartIce() | calling pc.setLocalDescription() [offer:%o]', offer);
-                            await this._pc.setLocalDescription(offer);
-                            const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
-                            logger.debug('restartIce() | calling pc.setRemoteDescription() [answer:%o]', answer);
-                            await this._pc.setRemoteDescription(answer);
-                        } else {
-                            const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
-                            logger.debug('restartIce() | calling pc.setRemoteDescription() [offer:%o]', offer);
-                            await this._pc.setRemoteDescription(offer);
-                            const answer = await this._pc.createAnswer();
-                            logger.debug('restartIce() | calling pc.setLocalDescription() [answer:%o]', answer);
-                            await this._pc.setLocalDescription(answer);
-                        }
-                    }
-                    async getTransportStats() {
-                        return this._pc.getStats();
-                    }
-                    async send({ track, encodings, codecOptions, codec }) {
-                        this._assertSendDirection();
-                        logger.debug('send() [kind:%s, track.id:%s]', track.kind, track.id);
-                        if (codec) {
-                            logger.warn('send() | codec selection is not available in %s handler', this.name);
-                        }
-                        this._sendStream.addTrack(track);
-                        this._pc.addStream(this._sendStream);
-                        let offer = await this._pc.createOffer();
-                        let localSdpObject = sdpTransform.parse(offer.sdp);
-                        let offerMediaObject;
-                        const sendingRtpParameters = utils.clone(this._sendingRtpParametersByKind[track.kind]);
-                        sendingRtpParameters.codecs = ortc.reduceCodecs(sendingRtpParameters.codecs);
-                        const sendingRemoteRtpParameters = utils.clone(
-                            this._sendingRemoteRtpParametersByKind[track.kind],
-                        );
-                        sendingRemoteRtpParameters.codecs = ortc.reduceCodecs(sendingRemoteRtpParameters.codecs);
-                        if (!this._transportReady)
-                            await this._setupTransport({ localDtlsRole: 'server', localSdpObject });
-                        if (track.kind === 'video' && encodings && encodings.length > 1) {
-                            logger.debug('send() | enabling simulcast');
-                            localSdpObject = sdpTransform.parse(offer.sdp);
-                            offerMediaObject = localSdpObject.media.find((m) => m.type === 'video');
-                            sdpPlanBUtils.addLegacySimulcast({
-                                offerMediaObject,
-                                track,
-                                numStreams: encodings.length,
-                            });
-                            offer = { type: 'offer', sdp: sdpTransform.write(localSdpObject) };
-                        }
-                        logger.debug('send() | calling pc.setLocalDescription() [offer:%o]', offer);
-                        await this._pc.setLocalDescription(offer);
-                        localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
-                        offerMediaObject = localSdpObject.media.find((m) => m.type === track.kind);
-                        // Set RTCP CNAME.
-                        sendingRtpParameters.rtcp.cname = sdpCommonUtils.getCname({ offerMediaObject });
-                        // Set RTP encodings.
-                        sendingRtpParameters.encodings = sdpPlanBUtils.getRtpEncodings({ offerMediaObject, track });
-                        // Complete encodings with given values.
-                        if (encodings) {
-                            for (let idx = 0; idx < sendingRtpParameters.encodings.length; ++idx) {
-                                if (encodings[idx]) Object.assign(sendingRtpParameters.encodings[idx], encodings[idx]);
-                            }
-                        }
-                        // If VP8 and there is effective simulcast, add scalabilityMode to each
-                        // encoding.
-                        if (
-                            sendingRtpParameters.encodings.length > 1 &&
-                            sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/vp8'
-                        ) {
-                            for (const encoding of sendingRtpParameters.encodings) {
-                                encoding.scalabilityMode = 'S1T3';
-                            }
-                        }
-                        this._remoteSdp.send({
-                            offerMediaObject,
-                            offerRtpParameters: sendingRtpParameters,
-                            answerRtpParameters: sendingRemoteRtpParameters,
-                            codecOptions,
-                        });
-                        const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
-                        logger.debug('send() | calling pc.setRemoteDescription() [answer:%o]', answer);
-                        await this._pc.setRemoteDescription(answer);
-                        const localId = String(this._nextSendLocalId);
-                        this._nextSendLocalId++;
-                        // Insert into the map.
-                        this._mapSendLocalIdTrack.set(localId, track);
-                        return {
-                            localId: localId,
-                            rtpParameters: sendingRtpParameters,
-                        };
-                    }
-                    async stopSending(localId) {
-                        this._assertSendDirection();
-                        logger.debug('stopSending() [localId:%s]', localId);
-                        const track = this._mapSendLocalIdTrack.get(localId);
-                        if (!track) throw new Error('track not found');
-                        this._mapSendLocalIdTrack.delete(localId);
-                        this._sendStream.removeTrack(track);
-                        this._pc.addStream(this._sendStream);
-                        const offer = await this._pc.createOffer();
-                        logger.debug('stopSending() | calling pc.setLocalDescription() [offer:%o]', offer);
-                        try {
-                            await this._pc.setLocalDescription(offer);
-                        } catch (error) {
-                            // NOTE: If there are no sending tracks, setLocalDescription() will fail with
-                            // "Failed to create channels". If so, ignore it.
-                            if (this._sendStream.getTracks().length === 0) {
-                                logger.warn(
-                                    'stopSending() | ignoring expected error due no sending tracks: %s',
-                                    error.toString(),
-                                );
-                                return;
-                            }
-                            throw error;
-                        }
-                        if (this._pc.signalingState === 'stable') return;
-                        const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
-                        logger.debug('stopSending() | calling pc.setRemoteDescription() [answer:%o]', answer);
-                        await this._pc.setRemoteDescription(answer);
-                    }
-                    async replaceTrack(
-                        // eslint-disable-next-line @typescript-eslint/no-unused-vars
-                        localId,
-                        track,
-                    ) {
-                        throw new errors_1.UnsupportedError('not implemented');
-                    }
-                    // eslint-disable-next-line @typescript-eslint/no-unused-vars
-                    async setMaxSpatialLayer(localId, spatialLayer) {
-                        throw new errors_1.UnsupportedError(' not implemented');
-                    }
-                    // eslint-disable-next-line @typescript-eslint/no-unused-vars
-                    async setRtpEncodingParameters(localId, params) {
-                        throw new errors_1.UnsupportedError('not supported');
-                    }
-                    // eslint-disable-next-line @typescript-eslint/no-unused-vars
-                    async getSenderStats(localId) {
-                        throw new errors_1.UnsupportedError('not implemented');
-                    }
-                    async sendDataChannel({ ordered, maxPacketLifeTime, maxRetransmits, label, protocol, priority }) {
-                        this._assertSendDirection();
-                        const options = {
-                            negotiated: true,
-                            id: this._nextSendSctpStreamId,
-                            ordered,
-                            maxPacketLifeTime,
-                            maxRetransmitTime: maxPacketLifeTime,
-                            maxRetransmits,
-                            protocol,
-                            priority,
-                        };
-                        logger.debug('sendDataChannel() [options:%o]', options);
-                        const dataChannel = this._pc.createDataChannel(label, options);
-                        // Increase next id.
-                        this._nextSendSctpStreamId = ++this._nextSendSctpStreamId % SCTP_NUM_STREAMS.MIS;
-                        // If this is the first DataChannel we need to create the SDP answer with
-                        // m=application section.
-                        if (!this._hasDataChannelMediaSection) {
-                            const offer = await this._pc.createOffer();
-                            const localSdpObject = sdpTransform.parse(offer.sdp);
-                            const offerMediaObject = localSdpObject.media.find((m) => m.type === 'application');
-                            if (!this._transportReady)
-                                await this._setupTransport({ localDtlsRole: 'server', localSdpObject });
-                            logger.debug('sendDataChannel() | calling pc.setLocalDescription() [offer:%o]', offer);
-                            await this._pc.setLocalDescription(offer);
-                            this._remoteSdp.sendSctpAssociation({ offerMediaObject });
-                            const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
-                            logger.debug('sendDataChannel() | calling pc.setRemoteDescription() [answer:%o]', answer);
-                            await this._pc.setRemoteDescription(answer);
-                            this._hasDataChannelMediaSection = true;
-                        }
-                        const sctpStreamParameters = {
-                            streamId: options.id,
-                            ordered: options.ordered,
-                            maxPacketLifeTime: options.maxPacketLifeTime,
-                            maxRetransmits: options.maxRetransmits,
-                        };
-                        return { dataChannel, sctpStreamParameters };
-                    }
-                    async receive({ trackId, kind, rtpParameters }) {
-                        this._assertRecvDirection();
-                        logger.debug('receive() [trackId:%s, kind:%s]', trackId, kind);
-                        const localId = trackId;
-                        const mid = kind;
-                        const streamId = rtpParameters.rtcp.cname;
-                        this._remoteSdp.receive({
-                            mid,
-                            kind,
-                            offerRtpParameters: rtpParameters,
-                            streamId,
-                            trackId,
-                        });
-                        const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
-                        logger.debug('receive() | calling pc.setRemoteDescription() [offer:%o]', offer);
-                        await this._pc.setRemoteDescription(offer);
-                        let answer = await this._pc.createAnswer();
-                        const localSdpObject = sdpTransform.parse(answer.sdp);
-                        const answerMediaObject = localSdpObject.media.find((m) => String(m.mid) === mid);
-                        // May need to modify codec parameters in the answer based on codec
-                        // parameters in the offer.
-                        sdpCommonUtils.applyCodecParameters({
-                            offerRtpParameters: rtpParameters,
-                            answerMediaObject,
-                        });
-                        answer = { type: 'answer', sdp: sdpTransform.write(localSdpObject) };
-                        if (!this._transportReady)
-                            await this._setupTransport({ localDtlsRole: 'client', localSdpObject });
-                        logger.debug('receive() | calling pc.setLocalDescription() [answer:%o]', answer);
-                        await this._pc.setLocalDescription(answer);
-                        const stream = this._pc.getRemoteStreams().find((s) => s.id === streamId);
-                        const track = stream.getTrackById(localId);
-                        if (!track) throw new Error('remote track not found');
-                        // Insert into the map.
-                        this._mapRecvLocalIdInfo.set(localId, { mid, rtpParameters });
-                        return { localId, track };
-                    }
-                    async stopReceiving(localId) {
-                        this._assertRecvDirection();
-                        logger.debug('stopReceiving() [localId:%s]', localId);
-                        const { mid, rtpParameters } = this._mapRecvLocalIdInfo.get(localId) || {};
-                        // Remove from the map.
-                        this._mapRecvLocalIdInfo.delete(localId);
-                        this._remoteSdp.planBStopReceiving({ mid: mid, offerRtpParameters: rtpParameters });
-                        const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
-                        logger.debug('stopReceiving() | calling pc.setRemoteDescription() [offer:%o]', offer);
-                        await this._pc.setRemoteDescription(offer);
-                        const answer = await this._pc.createAnswer();
-                        logger.debug('stopReceiving() | calling pc.setLocalDescription() [answer:%o]', answer);
-                        await this._pc.setLocalDescription(answer);
-                    }
-                    // eslint-disable-next-line @typescript-eslint/no-unused-vars
-                    async getReceiverStats(localId) {
-                        throw new errors_1.UnsupportedError('not implemented');
-                    }
-                    async receiveDataChannel({ sctpStreamParameters, label, protocol }) {
-                        this._assertRecvDirection();
-                        const { streamId, ordered, maxPacketLifeTime, maxRetransmits } = sctpStreamParameters;
-                        const options = {
-                            negotiated: true,
-                            id: streamId,
-                            ordered,
-                            maxPacketLifeTime,
-                            maxRetransmitTime: maxPacketLifeTime,
-                            maxRetransmits,
-                            protocol,
-                        };
-                        logger.debug('receiveDataChannel() [options:%o]', options);
-                        const dataChannel = this._pc.createDataChannel(label, options);
-                        // If this is the first DataChannel we need to create the SDP offer with
-                        // m=application section.
-                        if (!this._hasDataChannelMediaSection) {
-                            this._remoteSdp.receiveSctpAssociation({ oldDataChannelSpec: true });
-                            const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
-                            logger.debug('receiveDataChannel() | calling pc.setRemoteDescription() [offer:%o]', offer);
-                            await this._pc.setRemoteDescription(offer);
-                            const answer = await this._pc.createAnswer();
-                            if (!this._transportReady) {
-                                const localSdpObject = sdpTransform.parse(answer.sdp);
-                                await this._setupTransport({ localDtlsRole: 'client', localSdpObject });
-                            }
-                            logger.debug(
-                                'receiveDataChannel() | calling pc.setRemoteDescription() [answer:%o]',
-                                answer,
-                            );
-                            await this._pc.setLocalDescription(answer);
-                            this._hasDataChannelMediaSection = true;
-                        }
-                        return { dataChannel };
-                    }
-                    async _setupTransport({ localDtlsRole, localSdpObject }) {
-                        if (!localSdpObject) localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
-                        // Get our local DTLS parameters.
-                        const dtlsParameters = sdpCommonUtils.extractDtlsParameters({ sdpObject: localSdpObject });
-                        // Set our DTLS role.
-                        dtlsParameters.role = localDtlsRole;
-                        // Update the remote DTLS role in the SDP.
-                        this._remoteSdp.updateDtlsRole(localDtlsRole === 'client' ? 'server' : 'client');
-                        // Need to tell the remote transport about our parameters.
-                        await this.safeEmitAsPromise('@connect', { dtlsParameters });
-                        this._transportReady = true;
-                    }
-                    _assertSendDirection() {
-                        if (this._direction !== 'send') {
-                            throw new Error('method can just be called for handlers with "send" direction');
-                        }
-                    }
-                    _assertRecvDirection() {
-                        if (this._direction !== 'recv') {
-                            throw new Error('method can just be called for handlers with "recv" direction');
-                        }
-                    }
-                }
-                exports.Chrome55 = Chrome55;
-            },
+                audio: ortc.getSendingRtpParameters('audio', extendedRtpCapabilities),
+                video: ortc.getSendingRtpParameters('video', extendedRtpCapabilities)
+            };
+        this._sendingRemoteRtpParametersByKind =
             {
-                '../Logger': 12,
-                '../errors': 15,
-                '../ortc': 33,
-                '../utils': 36,
-                './HandlerInterface': 22,
-                './sdp/RemoteSdp': 28,
-                './sdp/commonUtils': 29,
-                './sdp/planBUtils': 30,
-                'sdp-transform': 41,
-            },
-        ],
-        17: [
-            function (require, module, exports) {
-                'use strict';
-                Object.defineProperty(exports, '__esModule', { value: true });
-                const sdpTransform = require('sdp-transform');
-                const Logger_1 = require('../Logger');
-                const utils = require('../utils');
-                const ortc = require('../ortc');
-                const sdpCommonUtils = require('./sdp/commonUtils');
-                const sdpPlanBUtils = require('./sdp/planBUtils');
-                const HandlerInterface_1 = require('./HandlerInterface');
-                const RemoteSdp_1 = require('./sdp/RemoteSdp');
-                const logger = new Logger_1.Logger('Chrome67');
-                const SCTP_NUM_STREAMS = { OS: 1024, MIS: 1024 };
-                class Chrome67 extends HandlerInterface_1.HandlerInterface {
-                    constructor() {
-                        super();
-                        // Local stream for sending.
-                        this._sendStream = new MediaStream();
-                        // Map of RTCRtpSender indexed by localId.
-                        this._mapSendLocalIdRtpSender = new Map();
-                        // Next sending localId.
-                        this._nextSendLocalId = 0;
-                        // Map of MID, RTP parameters and RTCRtpReceiver indexed by local id.
-                        // Value is an Object with mid, rtpParameters and rtpReceiver.
-                        this._mapRecvLocalIdInfo = new Map();
-                        // Whether a DataChannel m=application section has been created.
-                        this._hasDataChannelMediaSection = false;
-                        // Sending DataChannel id value counter. Incremented for each new DataChannel.
-                        this._nextSendSctpStreamId = 0;
-                        // Got transport local and remote parameters.
-                        this._transportReady = false;
-                    }
-                    /**
-                     * Creates a factory function.
-                     */
-                    static createFactory() {
-                        return () => new Chrome67();
-                    }
-                    get name() {
-                        return 'Chrome67';
-                    }
-                    close() {
-                        logger.debug('close()');
-                        // Close RTCPeerConnection.
-                        if (this._pc) {
-                            try {
-                                this._pc.close();
-                            } catch (error) {}
-                        }
-                    }
-                    async getNativeRtpCapabilities() {
-                        logger.debug('getNativeRtpCapabilities()');
-                        const pc = new RTCPeerConnection({
-                            iceServers: [],
-                            iceTransportPolicy: 'all',
-                            bundlePolicy: 'max-bundle',
-                            rtcpMuxPolicy: 'require',
-                            sdpSemantics: 'plan-b',
-                        });
-                        try {
-                            const offer = await pc.createOffer({
-                                offerToReceiveAudio: true,
-                                offerToReceiveVideo: true,
-                            });
-                            try {
-                                pc.close();
-                            } catch (error) {}
-                            const sdpObject = sdpTransform.parse(offer.sdp);
-                            const nativeRtpCapabilities = sdpCommonUtils.extractRtpCapabilities({ sdpObject });
-                            return nativeRtpCapabilities;
-                        } catch (error) {
-                            try {
-                                pc.close();
-                            } catch (error2) {}
-                            throw error;
-                        }
-                    }
-                    async getNativeSctpCapabilities() {
-                        logger.debug('getNativeSctpCapabilities()');
-                        return {
-                            numStreams: SCTP_NUM_STREAMS,
-                        };
-                    }
-                    run({
-                        direction,
-                        iceParameters,
-                        iceCandidates,
-                        dtlsParameters,
-                        sctpParameters,
-                        iceServers,
-                        iceTransportPolicy,
-                        additionalSettings,
-                        proprietaryConstraints,
-                        extendedRtpCapabilities,
-                    }) {
-                        logger.debug('run()');
-                        this._direction = direction;
-                        this._remoteSdp = new RemoteSdp_1.RemoteSdp({
-                            iceParameters,
-                            iceCandidates,
-                            dtlsParameters,
-                            sctpParameters,
-                            planB: true,
-                        });
-                        this._sendingRtpParametersByKind = {
-                            audio: ortc.getSendingRtpParameters('audio', extendedRtpCapabilities),
-                            video: ortc.getSendingRtpParameters('video', extendedRtpCapabilities),
-                        };
-                        this._sendingRemoteRtpParametersByKind = {
-                            audio: ortc.getSendingRemoteRtpParameters('audio', extendedRtpCapabilities),
-                            video: ortc.getSendingRemoteRtpParameters('video', extendedRtpCapabilities),
-                        };
-                        this._pc = new RTCPeerConnection(
-                            {
-                                iceServers: iceServers || [],
-                                iceTransportPolicy: iceTransportPolicy || 'all',
-                                bundlePolicy: 'max-bundle',
-                                rtcpMuxPolicy: 'require',
-                                sdpSemantics: 'plan-b',
-                                ...additionalSettings,
-                            },
-                            proprietaryConstraints,
-                        );
-                        // Handle RTCPeerConnection connection status.
-                        this._pc.addEventListener('iceconnectionstatechange', () => {
-                            switch (this._pc.iceConnectionState) {
-                                case 'checking':
-                                    this.emit('@connectionstatechange', 'connecting');
-                                    break;
-                                case 'connected':
-                                case 'completed':
-                                    this.emit('@connectionstatechange', 'connected');
-                                    break;
-                                case 'failed':
-                                    this.emit('@connectionstatechange', 'failed');
-                                    break;
-                                case 'disconnected':
-                                    this.emit('@connectionstatechange', 'disconnected');
-                                    break;
-                                case 'closed':
-                                    this.emit('@connectionstatechange', 'closed');
-                                    break;
-                            }
-                        });
-                    }
-                    async updateIceServers(iceServers) {
-                        logger.debug('updateIceServers()');
-                        const configuration = this._pc.getConfiguration();
-                        configuration.iceServers = iceServers;
-                        this._pc.setConfiguration(configuration);
-                    }
-                    async restartIce(iceParameters) {
-                        logger.debug('restartIce()');
-                        // Provide the remote SDP handler with new remote ICE parameters.
-                        this._remoteSdp.updateIceParameters(iceParameters);
-                        if (!this._transportReady) return;
-                        if (this._direction === 'send') {
-                            const offer = await this._pc.createOffer({ iceRestart: true });
-                            logger.debug('restartIce() | calling pc.setLocalDescription() [offer:%o]', offer);
-                            await this._pc.setLocalDescription(offer);
-                            const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
-                            logger.debug('restartIce() | calling pc.setRemoteDescription() [answer:%o]', answer);
-                            await this._pc.setRemoteDescription(answer);
-                        } else {
-                            const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
-                            logger.debug('restartIce() | calling pc.setRemoteDescription() [offer:%o]', offer);
-                            await this._pc.setRemoteDescription(offer);
-                            const answer = await this._pc.createAnswer();
-                            logger.debug('restartIce() | calling pc.setLocalDescription() [answer:%o]', answer);
-                            await this._pc.setLocalDescription(answer);
-                        }
-                    }
-                    async getTransportStats() {
-                        return this._pc.getStats();
-                    }
-                    async send({ track, encodings, codecOptions, codec }) {
-                        this._assertSendDirection();
-                        logger.debug('send() [kind:%s, track.id:%s]', track.kind, track.id);
-                        if (codec) {
-                            logger.warn('send() | codec selection is not available in %s handler', this.name);
-                        }
-                        this._sendStream.addTrack(track);
-                        this._pc.addTrack(track, this._sendStream);
-                        let offer = await this._pc.createOffer();
-                        let localSdpObject = sdpTransform.parse(offer.sdp);
-                        let offerMediaObject;
-                        const sendingRtpParameters = utils.clone(this._sendingRtpParametersByKind[track.kind]);
-                        sendingRtpParameters.codecs = ortc.reduceCodecs(sendingRtpParameters.codecs);
-                        const sendingRemoteRtpParameters = utils.clone(
-                            this._sendingRemoteRtpParametersByKind[track.kind],
-                        );
-                        sendingRemoteRtpParameters.codecs = ortc.reduceCodecs(sendingRemoteRtpParameters.codecs);
-                        if (!this._transportReady)
-                            await this._setupTransport({ localDtlsRole: 'server', localSdpObject });
-                        if (track.kind === 'video' && encodings && encodings.length > 1) {
-                            logger.debug('send() | enabling simulcast');
-                            localSdpObject = sdpTransform.parse(offer.sdp);
-                            offerMediaObject = localSdpObject.media.find((m) => m.type === 'video');
-                            sdpPlanBUtils.addLegacySimulcast({
-                                offerMediaObject,
-                                track,
-                                numStreams: encodings.length,
-                            });
-                            offer = { type: 'offer', sdp: sdpTransform.write(localSdpObject) };
-                        }
-                        logger.debug('send() | calling pc.setLocalDescription() [offer:%o]', offer);
-                        await this._pc.setLocalDescription(offer);
-                        localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
-                        offerMediaObject = localSdpObject.media.find((m) => m.type === track.kind);
-                        // Set RTCP CNAME.
-                        sendingRtpParameters.rtcp.cname = sdpCommonUtils.getCname({ offerMediaObject });
-                        // Set RTP encodings.
-                        sendingRtpParameters.encodings = sdpPlanBUtils.getRtpEncodings({ offerMediaObject, track });
-                        // Complete encodings with given values.
-                        if (encodings) {
-                            for (let idx = 0; idx < sendingRtpParameters.encodings.length; ++idx) {
-                                if (encodings[idx]) Object.assign(sendingRtpParameters.encodings[idx], encodings[idx]);
-                            }
-                        }
-                        // If VP8 and there is effective simulcast, add scalabilityMode to each
-                        // encoding.
-                        if (
-                            sendingRtpParameters.encodings.length > 1 &&
-                            sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/vp8'
-                        ) {
-                            for (const encoding of sendingRtpParameters.encodings) {
-                                encoding.scalabilityMode = 'S1T3';
-                            }
-                        }
-                        this._remoteSdp.send({
-                            offerMediaObject,
-                            offerRtpParameters: sendingRtpParameters,
-                            answerRtpParameters: sendingRemoteRtpParameters,
-                            codecOptions,
-                        });
-                        const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
-                        logger.debug('send() | calling pc.setRemoteDescription() [answer:%o]', answer);
-                        await this._pc.setRemoteDescription(answer);
-                        const localId = String(this._nextSendLocalId);
-                        this._nextSendLocalId++;
-                        const rtpSender = this._pc.getSenders().find((s) => s.track === track);
-                        // Insert into the map.
-                        this._mapSendLocalIdRtpSender.set(localId, rtpSender);
-                        return {
-                            localId: localId,
-                            rtpParameters: sendingRtpParameters,
-                            rtpSender,
-                        };
-                    }
-                    async stopSending(localId) {
-                        this._assertSendDirection();
-                        logger.debug('stopSending() [localId:%s]', localId);
-                        const rtpSender = this._mapSendLocalIdRtpSender.get(localId);
-                        if (!rtpSender) throw new Error('associated RTCRtpSender not found');
-                        this._pc.removeTrack(rtpSender);
-                        if (rtpSender.track) this._sendStream.removeTrack(rtpSender.track);
-                        this._mapSendLocalIdRtpSender.delete(localId);
-                        const offer = await this._pc.createOffer();
-                        logger.debug('stopSending() | calling pc.setLocalDescription() [offer:%o]', offer);
-                        try {
-                            await this._pc.setLocalDescription(offer);
-                        } catch (error) {
-                            // NOTE: If there are no sending tracks, setLocalDescription() will fail with
-                            // "Failed to create channels". If so, ignore it.
-                            if (this._sendStream.getTracks().length === 0) {
-                                logger.warn(
-                                    'stopSending() | ignoring expected error due no sending tracks: %s',
-                                    error.toString(),
-                                );
-                                return;
-                            }
-                            throw error;
-                        }
-                        if (this._pc.signalingState === 'stable') return;
-                        const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
-                        logger.debug('stopSending() | calling pc.setRemoteDescription() [answer:%o]', answer);
-                        await this._pc.setRemoteDescription(answer);
-                    }
-                    async replaceTrack(localId, track) {
-                        this._assertSendDirection();
-                        if (track) {
-                            logger.debug('replaceTrack() [localId:%s, track.id:%s]', localId, track.id);
-                        } else {
-                            logger.debug('replaceTrack() [localId:%s, no track]', localId);
-                        }
-                        const rtpSender = this._mapSendLocalIdRtpSender.get(localId);
-                        if (!rtpSender) throw new Error('associated RTCRtpSender not found');
-                        const oldTrack = rtpSender.track;
-                        await rtpSender.replaceTrack(track);
-                        // Remove the old track from the local stream.
-                        if (oldTrack) this._sendStream.removeTrack(oldTrack);
-                        // Add the new track to the local stream.
-                        if (track) this._sendStream.addTrack(track);
-                    }
-                    async setMaxSpatialLayer(localId, spatialLayer) {
-                        this._assertSendDirection();
-                        logger.debug('setMaxSpatialLayer() [localId:%s, spatialLayer:%s]', localId, spatialLayer);
-                        const rtpSender = this._mapSendLocalIdRtpSender.get(localId);
-                        if (!rtpSender) throw new Error('associated RTCRtpSender not found');
-                        const parameters = rtpSender.getParameters();
-                        parameters.encodings.forEach((encoding, idx) => {
-                            if (idx <= spatialLayer) encoding.active = true;
-                            else encoding.active = false;
-                        });
-                        await rtpSender.setParameters(parameters);
-                    }
-                    async setRtpEncodingParameters(localId, params) {
-                        this._assertSendDirection();
-                        logger.debug('setRtpEncodingParameters() [localId:%s, params:%o]', localId, params);
-                        const rtpSender = this._mapSendLocalIdRtpSender.get(localId);
-                        if (!rtpSender) throw new Error('associated RTCRtpSender not found');
-                        const parameters = rtpSender.getParameters();
-                        parameters.encodings.forEach((encoding, idx) => {
-                            parameters.encodings[idx] = { ...encoding, ...params };
-                        });
-                        await rtpSender.setParameters(parameters);
-                    }
-                    async getSenderStats(localId) {
-                        this._assertSendDirection();
-                        const rtpSender = this._mapSendLocalIdRtpSender.get(localId);
-                        if (!rtpSender) throw new Error('associated RTCRtpSender not found');
-                        return rtpSender.getStats();
-                    }
-                    async sendDataChannel({ ordered, maxPacketLifeTime, maxRetransmits, label, protocol, priority }) {
-                        this._assertSendDirection();
-                        const options = {
-                            negotiated: true,
-                            id: this._nextSendSctpStreamId,
-                            ordered,
-                            maxPacketLifeTime,
-                            maxRetransmitTime: maxPacketLifeTime,
-                            maxRetransmits,
-                            protocol,
-                            priority,
-                        };
-                        logger.debug('sendDataChannel() [options:%o]', options);
-                        const dataChannel = this._pc.createDataChannel(label, options);
-                        // Increase next id.
-                        this._nextSendSctpStreamId = ++this._nextSendSctpStreamId % SCTP_NUM_STREAMS.MIS;
-                        // If this is the first DataChannel we need to create the SDP answer with
-                        // m=application section.
-                        if (!this._hasDataChannelMediaSection) {
-                            const offer = await this._pc.createOffer();
-                            const localSdpObject = sdpTransform.parse(offer.sdp);
-                            const offerMediaObject = localSdpObject.media.find((m) => m.type === 'application');
-                            if (!this._transportReady)
-                                await this._setupTransport({ localDtlsRole: 'server', localSdpObject });
-                            logger.debug('sendDataChannel() | calling pc.setLocalDescription() [offer:%o]', offer);
-                            await this._pc.setLocalDescription(offer);
-                            this._remoteSdp.sendSctpAssociation({ offerMediaObject });
-                            const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
-                            logger.debug('sendDataChannel() | calling pc.setRemoteDescription() [answer:%o]', answer);
-                            await this._pc.setRemoteDescription(answer);
-                            this._hasDataChannelMediaSection = true;
-                        }
-                        const sctpStreamParameters = {
-                            streamId: options.id,
-                            ordered: options.ordered,
-                            maxPacketLifeTime: options.maxPacketLifeTime,
-                            maxRetransmits: options.maxRetransmits,
-                        };
-                        return { dataChannel, sctpStreamParameters };
-                    }
-                    async receive({ trackId, kind, rtpParameters }) {
-                        this._assertRecvDirection();
-                        logger.debug('receive() [trackId:%s, kind:%s]', trackId, kind);
-                        const localId = trackId;
-                        const mid = kind;
-                        this._remoteSdp.receive({
-                            mid,
-                            kind,
-                            offerRtpParameters: rtpParameters,
-                            streamId: rtpParameters.rtcp.cname,
-                            trackId,
-                        });
-                        const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
-                        logger.debug('receive() | calling pc.setRemoteDescription() [offer:%o]', offer);
-                        await this._pc.setRemoteDescription(offer);
-                        let answer = await this._pc.createAnswer();
-                        const localSdpObject = sdpTransform.parse(answer.sdp);
-                        const answerMediaObject = localSdpObject.media.find((m) => String(m.mid) === mid);
-                        // May need to modify codec parameters in the answer based on codec
-                        // parameters in the offer.
-                        sdpCommonUtils.applyCodecParameters({
-                            offerRtpParameters: rtpParameters,
-                            answerMediaObject,
-                        });
-                        answer = { type: 'answer', sdp: sdpTransform.write(localSdpObject) };
-                        if (!this._transportReady)
-                            await this._setupTransport({ localDtlsRole: 'client', localSdpObject });
-                        logger.debug('receive() | calling pc.setLocalDescription() [answer:%o]', answer);
-                        await this._pc.setLocalDescription(answer);
-                        const rtpReceiver = this._pc.getReceivers().find((r) => r.track && r.track.id === localId);
-                        if (!rtpReceiver) throw new Error('new RTCRtpReceiver not');
-                        // Insert into the map.
-                        this._mapRecvLocalIdInfo.set(localId, { mid, rtpParameters, rtpReceiver });
-                        return {
-                            localId,
-                            track: rtpReceiver.track,
-                            rtpReceiver,
-                        };
-                    }
-                    async stopReceiving(localId) {
-                        this._assertRecvDirection();
-                        logger.debug('stopReceiving() [localId:%s]', localId);
-                        const { mid, rtpParameters } = this._mapRecvLocalIdInfo.get(localId) || {};
-                        // Remove from the map.
-                        this._mapRecvLocalIdInfo.delete(localId);
-                        this._remoteSdp.planBStopReceiving({ mid: mid, offerRtpParameters: rtpParameters });
-                        const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
-                        logger.debug('stopReceiving() | calling pc.setRemoteDescription() [offer:%o]', offer);
-                        await this._pc.setRemoteDescription(offer);
-                        const answer = await this._pc.createAnswer();
-                        logger.debug('stopReceiving() | calling pc.setLocalDescription() [answer:%o]', answer);
-                        await this._pc.setLocalDescription(answer);
-                    }
-                    async getReceiverStats(localId) {
-                        this._assertRecvDirection();
-                        const { rtpReceiver } = this._mapRecvLocalIdInfo.get(localId) || {};
-                        if (!rtpReceiver) throw new Error('associated RTCRtpReceiver not found');
-                        return rtpReceiver.getStats();
-                    }
-                    async receiveDataChannel({ sctpStreamParameters, label, protocol }) {
-                        this._assertRecvDirection();
-                        const { streamId, ordered, maxPacketLifeTime, maxRetransmits } = sctpStreamParameters;
-                        const options = {
-                            negotiated: true,
-                            id: streamId,
-                            ordered,
-                            maxPacketLifeTime,
-                            maxRetransmitTime: maxPacketLifeTime,
-                            maxRetransmits,
-                            protocol,
-                        };
-                        logger.debug('receiveDataChannel() [options:%o]', options);
-                        const dataChannel = this._pc.createDataChannel(label, options);
-                        // If this is the first DataChannel we need to create the SDP offer with
-                        // m=application section.
-                        if (!this._hasDataChannelMediaSection) {
-                            this._remoteSdp.receiveSctpAssociation({ oldDataChannelSpec: true });
-                            const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
-                            logger.debug('receiveDataChannel() | calling pc.setRemoteDescription() [offer:%o]', offer);
-                            await this._pc.setRemoteDescription(offer);
-                            const answer = await this._pc.createAnswer();
-                            if (!this._transportReady) {
-                                const localSdpObject = sdpTransform.parse(answer.sdp);
-                                await this._setupTransport({ localDtlsRole: 'client', localSdpObject });
-                            }
-                            logger.debug(
-                                'receiveDataChannel() | calling pc.setRemoteDescription() [answer:%o]',
-                                answer,
-                            );
-                            await this._pc.setLocalDescription(answer);
-                            this._hasDataChannelMediaSection = true;
-                        }
-                        return { dataChannel };
-                    }
-                    async _setupTransport({ localDtlsRole, localSdpObject }) {
-                        if (!localSdpObject) localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
-                        // Get our local DTLS parameters.
-                        const dtlsParameters = sdpCommonUtils.extractDtlsParameters({ sdpObject: localSdpObject });
-                        // Set our DTLS role.
-                        dtlsParameters.role = localDtlsRole;
-                        // Update the remote DTLS role in the SDP.
-                        this._remoteSdp.updateDtlsRole(localDtlsRole === 'client' ? 'server' : 'client');
-                        // Need to tell the remote transport about our parameters.
-                        await this.safeEmitAsPromise('@connect', { dtlsParameters });
-                        this._transportReady = true;
-                    }
-                    _assertSendDirection() {
-                        if (this._direction !== 'send') {
-                            throw new Error('method can just be called for handlers with "send" direction');
-                        }
-                    }
-                    _assertRecvDirection() {
-                        if (this._direction !== 'recv') {
-                            throw new Error('method can just be called for handlers with "recv" direction');
-                        }
-                    }
-                }
-                exports.Chrome67 = Chrome67;
-            },
-            {
-                '../Logger': 12,
-                '../ortc': 33,
-                '../utils': 36,
-                './HandlerInterface': 22,
-                './sdp/RemoteSdp': 28,
-                './sdp/commonUtils': 29,
-                './sdp/planBUtils': 30,
-                'sdp-transform': 41,
-            },
-        ],
-        18: [
-            function (require, module, exports) {
-                'use strict';
-                Object.defineProperty(exports, '__esModule', { value: true });
-                const sdpTransform = require('sdp-transform');
-                const Logger_1 = require('../Logger');
-                const utils = require('../utils');
-                const ortc = require('../ortc');
-                const sdpCommonUtils = require('./sdp/commonUtils');
-                const sdpUnifiedPlanUtils = require('./sdp/unifiedPlanUtils');
-                const HandlerInterface_1 = require('./HandlerInterface');
-                const RemoteSdp_1 = require('./sdp/RemoteSdp');
-                const scalabilityModes_1 = require('../scalabilityModes');
-                const logger = new Logger_1.Logger('Chrome70');
-                const SCTP_NUM_STREAMS = { OS: 1024, MIS: 1024 };
-                class Chrome70 extends HandlerInterface_1.HandlerInterface {
-                    constructor() {
-                        super();
-                        // Map of RTCTransceivers indexed by MID.
-                        this._mapMidTransceiver = new Map();
-                        // Local stream for sending.
-                        this._sendStream = new MediaStream();
-                        // Whether a DataChannel m=application section has been created.
-                        this._hasDataChannelMediaSection = false;
-                        // Sending DataChannel id value counter. Incremented for each new DataChannel.
-                        this._nextSendSctpStreamId = 0;
-                        // Got transport local and remote parameters.
-                        this._transportReady = false;
-                    }
-                    /**
-                     * Creates a factory function.
-                     */
-                    static createFactory() {
-                        return () => new Chrome70();
-                    }
-                    get name() {
-                        return 'Chrome70';
-                    }
-                    close() {
-                        logger.debug('close()');
-                        // Close RTCPeerConnection.
-                        if (this._pc) {
-                            try {
-                                this._pc.close();
-                            } catch (error) {}
-                        }
-                    }
-                    async getNativeRtpCapabilities() {
-                        logger.debug('getNativeRtpCapabilities()');
-                        const pc = new RTCPeerConnection({
-                            iceServers: [],
-                            iceTransportPolicy: 'all',
-                            bundlePolicy: 'max-bundle',
-                            rtcpMuxPolicy: 'require',
-                            sdpSemantics: 'unified-plan',
-                        });
-                        try {
-                            pc.addTransceiver('audio');
-                            pc.addTransceiver('video');
-                            const offer = await pc.createOffer();
-                            try {
-                                pc.close();
-                            } catch (error) {}
-                            const sdpObject = sdpTransform.parse(offer.sdp);
-                            const nativeRtpCapabilities = sdpCommonUtils.extractRtpCapabilities({ sdpObject });
-                            return nativeRtpCapabilities;
-                        } catch (error) {
-                            try {
-                                pc.close();
-                            } catch (error2) {}
-                            throw error;
-                        }
-                    }
-                    async getNativeSctpCapabilities() {
-                        logger.debug('getNativeSctpCapabilities()');
-                        return {
-                            numStreams: SCTP_NUM_STREAMS,
-                        };
-                    }
-                    run({
-                        direction,
-                        iceParameters,
-                        iceCandidates,
-                        dtlsParameters,
-                        sctpParameters,
-                        iceServers,
-                        iceTransportPolicy,
-                        additionalSettings,
-                        proprietaryConstraints,
-                        extendedRtpCapabilities,
-                    }) {
-                        logger.debug('run()');
-                        this._direction = direction;
-                        this._remoteSdp = new RemoteSdp_1.RemoteSdp({
-                            iceParameters,
-                            iceCandidates,
-                            dtlsParameters,
-                            sctpParameters,
-                        });
-                        this._sendingRtpParametersByKind = {
-                            audio: ortc.getSendingRtpParameters('audio', extendedRtpCapabilities),
-                            video: ortc.getSendingRtpParameters('video', extendedRtpCapabilities),
-                        };
-                        this._sendingRemoteRtpParametersByKind = {
-                            audio: ortc.getSendingRemoteRtpParameters('audio', extendedRtpCapabilities),
-                            video: ortc.getSendingRemoteRtpParameters('video', extendedRtpCapabilities),
-                        };
-                        this._pc = new RTCPeerConnection(
-                            {
-                                iceServers: iceServers || [],
-                                iceTransportPolicy: iceTransportPolicy || 'all',
-                                bundlePolicy: 'max-bundle',
-                                rtcpMuxPolicy: 'require',
-                                sdpSemantics: 'unified-plan',
-                                ...additionalSettings,
-                            },
-                            proprietaryConstraints,
-                        );
-                        // Handle RTCPeerConnection connection status.
-                        this._pc.addEventListener('iceconnectionstatechange', () => {
-                            switch (this._pc.iceConnectionState) {
-                                case 'checking':
-                                    this.emit('@connectionstatechange', 'connecting');
-                                    break;
-                                case 'connected':
-                                case 'completed':
-                                    this.emit('@connectionstatechange', 'connected');
-                                    break;
-                                case 'failed':
-                                    this.emit('@connectionstatechange', 'failed');
-                                    break;
-                                case 'disconnected':
-                                    this.emit('@connectionstatechange', 'disconnected');
-                                    break;
-                                case 'closed':
-                                    this.emit('@connectionstatechange', 'closed');
-                                    break;
-                            }
-                        });
-                    }
-                    async updateIceServers(iceServers) {
-                        logger.debug('updateIceServers()');
-                        const configuration = this._pc.getConfiguration();
-                        configuration.iceServers = iceServers;
-                        this._pc.setConfiguration(configuration);
-                    }
-                    async restartIce(iceParameters) {
-                        logger.debug('restartIce()');
-                        // Provide the remote SDP handler with new remote ICE parameters.
-                        this._remoteSdp.updateIceParameters(iceParameters);
-                        if (!this._transportReady) return;
-                        if (this._direction === 'send') {
-                            const offer = await this._pc.createOffer({ iceRestart: true });
-                            logger.debug('restartIce() | calling pc.setLocalDescription() [offer:%o]', offer);
-                            await this._pc.setLocalDescription(offer);
-                            const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
-                            logger.debug('restartIce() | calling pc.setRemoteDescription() [answer:%o]', answer);
-                            await this._pc.setRemoteDescription(answer);
-                        } else {
-                            const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
-                            logger.debug('restartIce() | calling pc.setRemoteDescription() [offer:%o]', offer);
-                            await this._pc.setRemoteDescription(offer);
-                            const answer = await this._pc.createAnswer();
-                            logger.debug('restartIce() | calling pc.setLocalDescription() [answer:%o]', answer);
-                            await this._pc.setLocalDescription(answer);
-                        }
-                    }
-                    async getTransportStats() {
-                        return this._pc.getStats();
-                    }
-                    async send({ track, encodings, codecOptions, codec }) {
-                        this._assertSendDirection();
-                        logger.debug('send() [kind:%s, track.id:%s]', track.kind, track.id);
-                        const sendingRtpParameters = utils.clone(this._sendingRtpParametersByKind[track.kind]);
-                        // This may throw.
-                        sendingRtpParameters.codecs = ortc.reduceCodecs(sendingRtpParameters.codecs, codec);
-                        const sendingRemoteRtpParameters = utils.clone(
-                            this._sendingRemoteRtpParametersByKind[track.kind],
-                        );
-                        // This may throw.
-                        sendingRemoteRtpParameters.codecs = ortc.reduceCodecs(sendingRemoteRtpParameters.codecs, codec);
-                        const mediaSectionIdx = this._remoteSdp.getNextMediaSectionIdx();
-                        const transceiver = this._pc.addTransceiver(track, {
-                            direction: 'sendonly',
-                            streams: [this._sendStream],
-                        });
-                        let offer = await this._pc.createOffer();
-                        let localSdpObject = sdpTransform.parse(offer.sdp);
-                        let offerMediaObject;
-                        if (!this._transportReady)
-                            await this._setupTransport({ localDtlsRole: 'server', localSdpObject });
-                        if (encodings && encodings.length > 1) {
-                            logger.debug('send() | enabling legacy simulcast');
-                            localSdpObject = sdpTransform.parse(offer.sdp);
-                            offerMediaObject = localSdpObject.media[mediaSectionIdx.idx];
-                            sdpUnifiedPlanUtils.addLegacySimulcast({
-                                offerMediaObject,
-                                numStreams: encodings.length,
-                            });
-                            offer = { type: 'offer', sdp: sdpTransform.write(localSdpObject) };
-                        }
-                        // Special case for VP9 with SVC.
-                        let hackVp9Svc = false;
-                        const layers = scalabilityModes_1.parse((encodings || [{}])[0].scalabilityMode);
-                        if (
-                            encodings &&
-                            encodings.length === 1 &&
-                            layers.spatialLayers > 1 &&
-                            sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/vp9'
-                        ) {
-                            logger.debug('send() | enabling legacy simulcast for VP9 SVC');
-                            hackVp9Svc = true;
-                            localSdpObject = sdpTransform.parse(offer.sdp);
-                            offerMediaObject = localSdpObject.media[mediaSectionIdx.idx];
-                            sdpUnifiedPlanUtils.addLegacySimulcast({
-                                offerMediaObject,
-                                numStreams: layers.spatialLayers,
-                            });
-                            offer = { type: 'offer', sdp: sdpTransform.write(localSdpObject) };
-                        }
-                        logger.debug('send() | calling pc.setLocalDescription() [offer:%o]', offer);
-                        await this._pc.setLocalDescription(offer);
-                        // If encodings are given, apply them now.
-                        if (encodings) {
-                            logger.debug('send() | applying given encodings');
-                            const parameters = transceiver.sender.getParameters();
-                            for (let idx = 0; idx < (parameters.encodings || []).length; ++idx) {
-                                const encoding = parameters.encodings[idx];
-                                const desiredEncoding = encodings[idx];
-                                // Should not happen but just in case.
-                                if (!desiredEncoding) break;
-                                parameters.encodings[idx] = Object.assign(encoding, desiredEncoding);
-                            }
-                            await transceiver.sender.setParameters(parameters);
-                        }
-                        // We can now get the transceiver.mid.
-                        const localId = transceiver.mid;
-                        // Set MID.
-                        sendingRtpParameters.mid = localId;
-                        localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
-                        offerMediaObject = localSdpObject.media[mediaSectionIdx.idx];
-                        // Set RTCP CNAME.
-                        sendingRtpParameters.rtcp.cname = sdpCommonUtils.getCname({ offerMediaObject });
-                        // Set RTP encodings.
-                        sendingRtpParameters.encodings = sdpUnifiedPlanUtils.getRtpEncodings({ offerMediaObject });
-                        // Complete encodings with given values.
-                        if (encodings) {
-                            for (let idx = 0; idx < sendingRtpParameters.encodings.length; ++idx) {
-                                if (encodings[idx]) Object.assign(sendingRtpParameters.encodings[idx], encodings[idx]);
-                            }
-                        }
-                        // Hack for VP9 SVC.
-                        if (hackVp9Svc) {
-                            sendingRtpParameters.encodings = [sendingRtpParameters.encodings[0]];
-                        }
-                        // If VP8 or H264 and there is effective simulcast, add scalabilityMode to
-                        // each encoding.
-                        if (
-                            sendingRtpParameters.encodings.length > 1 &&
-                            (sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/vp8' ||
-                                sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/h264')
-                        ) {
-                            for (const encoding of sendingRtpParameters.encodings) {
-                                encoding.scalabilityMode = 'S1T3';
-                            }
-                        }
-                        this._remoteSdp.send({
-                            offerMediaObject,
-                            reuseMid: mediaSectionIdx.reuseMid,
-                            offerRtpParameters: sendingRtpParameters,
-                            answerRtpParameters: sendingRemoteRtpParameters,
-                            codecOptions,
-                        });
-                        const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
-                        logger.debug('send() | calling pc.setRemoteDescription() [answer:%o]', answer);
-                        await this._pc.setRemoteDescription(answer);
-                        // Store in the map.
-                        this._mapMidTransceiver.set(localId, transceiver);
-                        return {
-                            localId,
-                            rtpParameters: sendingRtpParameters,
-                            rtpSender: transceiver.sender,
-                        };
-                    }
-                    async stopSending(localId) {
-                        this._assertSendDirection();
-                        logger.debug('stopSending() [localId:%s]', localId);
-                        const transceiver = this._mapMidTransceiver.get(localId);
-                        if (!transceiver) throw new Error('associated RTCRtpTransceiver not found');
-                        transceiver.sender.replaceTrack(null);
-                        this._pc.removeTrack(transceiver.sender);
-                        this._remoteSdp.closeMediaSection(transceiver.mid);
-                        const offer = await this._pc.createOffer();
-                        logger.debug('stopSending() | calling pc.setLocalDescription() [offer:%o]', offer);
-                        await this._pc.setLocalDescription(offer);
-                        const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
-                        logger.debug('stopSending() | calling pc.setRemoteDescription() [answer:%o]', answer);
-                        await this._pc.setRemoteDescription(answer);
-                    }
-                    async replaceTrack(localId, track) {
-                        this._assertSendDirection();
-                        if (track) {
-                            logger.debug('replaceTrack() [localId:%s, track.id:%s]', localId, track.id);
-                        } else {
-                            logger.debug('replaceTrack() [localId:%s, no track]', localId);
-                        }
-                        const transceiver = this._mapMidTransceiver.get(localId);
-                        if (!transceiver) throw new Error('associated RTCRtpTransceiver not found');
-                        await transceiver.sender.replaceTrack(track);
-                    }
-                    async setMaxSpatialLayer(localId, spatialLayer) {
-                        this._assertSendDirection();
-                        logger.debug('setMaxSpatialLayer() [localId:%s, spatialLayer:%s]', localId, spatialLayer);
-                        const transceiver = this._mapMidTransceiver.get(localId);
-                        if (!transceiver) throw new Error('associated RTCRtpTransceiver not found');
-                        const parameters = transceiver.sender.getParameters();
-                        parameters.encodings.forEach((encoding, idx) => {
-                            if (idx <= spatialLayer) encoding.active = true;
-                            else encoding.active = false;
-                        });
-                        await transceiver.sender.setParameters(parameters);
-                    }
-                    async setRtpEncodingParameters(localId, params) {
-                        this._assertSendDirection();
-                        logger.debug('setRtpEncodingParameters() [localId:%s, params:%o]', localId, params);
-                        const transceiver = this._mapMidTransceiver.get(localId);
-                        if (!transceiver) throw new Error('associated RTCRtpTransceiver not found');
-                        const parameters = transceiver.sender.getParameters();
-                        parameters.encodings.forEach((encoding, idx) => {
-                            parameters.encodings[idx] = { ...encoding, ...params };
-                        });
-                        await transceiver.sender.setParameters(parameters);
-                    }
-                    async getSenderStats(localId) {
-                        this._assertSendDirection();
-                        const transceiver = this._mapMidTransceiver.get(localId);
-                        if (!transceiver) throw new Error('associated RTCRtpTransceiver not found');
-                        return transceiver.sender.getStats();
-                    }
-                    async sendDataChannel({ ordered, maxPacketLifeTime, maxRetransmits, label, protocol, priority }) {
-                        this._assertSendDirection();
-                        const options = {
-                            negotiated: true,
-                            id: this._nextSendSctpStreamId,
-                            ordered,
-                            maxPacketLifeTime,
-                            maxRetransmitTime: maxPacketLifeTime,
-                            maxRetransmits,
-                            protocol,
-                            priority,
-                        };
-                        logger.debug('sendDataChannel() [options:%o]', options);
-                        const dataChannel = this._pc.createDataChannel(label, options);
-                        // Increase next id.
-                        this._nextSendSctpStreamId = ++this._nextSendSctpStreamId % SCTP_NUM_STREAMS.MIS;
-                        // If this is the first DataChannel we need to create the SDP answer with
-                        // m=application section.
-                        if (!this._hasDataChannelMediaSection) {
-                            const offer = await this._pc.createOffer();
-                            const localSdpObject = sdpTransform.parse(offer.sdp);
-                            const offerMediaObject = localSdpObject.media.find((m) => m.type === 'application');
-                            if (!this._transportReady)
-                                await this._setupTransport({ localDtlsRole: 'server', localSdpObject });
-                            logger.debug('sendDataChannel() | calling pc.setLocalDescription() [offer:%o]', offer);
-                            await this._pc.setLocalDescription(offer);
-                            this._remoteSdp.sendSctpAssociation({ offerMediaObject });
-                            const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
-                            logger.debug('sendDataChannel() | calling pc.setRemoteDescription() [answer:%o]', answer);
-                            await this._pc.setRemoteDescription(answer);
-                            this._hasDataChannelMediaSection = true;
-                        }
-                        const sctpStreamParameters = {
-                            streamId: options.id,
-                            ordered: options.ordered,
-                            maxPacketLifeTime: options.maxPacketLifeTime,
-                            maxRetransmits: options.maxRetransmits,
-                        };
-                        return { dataChannel, sctpStreamParameters };
-                    }
-                    async receive({ trackId, kind, rtpParameters }) {
-                        this._assertRecvDirection();
-                        logger.debug('receive() [trackId:%s, kind:%s]', trackId, kind);
-                        const localId = rtpParameters.mid || String(this._mapMidTransceiver.size);
-                        this._remoteSdp.receive({
-                            mid: localId,
-                            kind,
-                            offerRtpParameters: rtpParameters,
-                            streamId: rtpParameters.rtcp.cname,
-                            trackId,
-                        });
-                        const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
-                        logger.debug('receive() | calling pc.setRemoteDescription() [offer:%o]', offer);
-                        await this._pc.setRemoteDescription(offer);
-                        let answer = await this._pc.createAnswer();
-                        const localSdpObject = sdpTransform.parse(answer.sdp);
-                        const answerMediaObject = localSdpObject.media.find((m) => String(m.mid) === localId);
-                        // May need to modify codec parameters in the answer based on codec
-                        // parameters in the offer.
-                        sdpCommonUtils.applyCodecParameters({
-                            offerRtpParameters: rtpParameters,
-                            answerMediaObject,
-                        });
-                        answer = { type: 'answer', sdp: sdpTransform.write(localSdpObject) };
-                        if (!this._transportReady)
-                            await this._setupTransport({ localDtlsRole: 'client', localSdpObject });
-                        logger.debug('receive() | calling pc.setLocalDescription() [answer:%o]', answer);
-                        await this._pc.setLocalDescription(answer);
-                        const transceiver = this._pc.getTransceivers().find((t) => t.mid === localId);
-                        if (!transceiver) throw new Error('new RTCRtpTransceiver not found');
-                        // Store in the map.
-                        this._mapMidTransceiver.set(localId, transceiver);
-                        return {
-                            localId,
-                            track: transceiver.receiver.track,
-                            rtpReceiver: transceiver.receiver,
-                        };
-                    }
-                    async stopReceiving(localId) {
-                        this._assertRecvDirection();
-                        logger.debug('stopReceiving() [localId:%s]', localId);
-                        const transceiver = this._mapMidTransceiver.get(localId);
-                        if (!transceiver) throw new Error('associated RTCRtpTransceiver not found');
-                        this._remoteSdp.closeMediaSection(transceiver.mid);
-                        const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
-                        logger.debug('stopReceiving() | calling pc.setRemoteDescription() [offer:%o]', offer);
-                        await this._pc.setRemoteDescription(offer);
-                        const answer = await this._pc.createAnswer();
-                        logger.debug('stopReceiving() | calling pc.setLocalDescription() [answer:%o]', answer);
-                        await this._pc.setLocalDescription(answer);
-                    }
-                    async getReceiverStats(localId) {
-                        this._assertRecvDirection();
-                        const transceiver = this._mapMidTransceiver.get(localId);
-                        if (!transceiver) throw new Error('associated RTCRtpTransceiver not found');
-                        return transceiver.receiver.getStats();
-                    }
-                    async receiveDataChannel({ sctpStreamParameters, label, protocol }) {
-                        this._assertRecvDirection();
-                        const { streamId, ordered, maxPacketLifeTime, maxRetransmits } = sctpStreamParameters;
-                        const options = {
-                            negotiated: true,
-                            id: streamId,
-                            ordered,
-                            maxPacketLifeTime,
-                            maxRetransmitTime: maxPacketLifeTime,
-                            maxRetransmits,
-                            protocol,
-                        };
-                        logger.debug('receiveDataChannel() [options:%o]', options);
-                        const dataChannel = this._pc.createDataChannel(label, options);
-                        // If this is the first DataChannel we need to create the SDP offer with
-                        // m=application section.
-                        if (!this._hasDataChannelMediaSection) {
-                            this._remoteSdp.receiveSctpAssociation();
-                            const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
-                            logger.debug('receiveDataChannel() | calling pc.setRemoteDescription() [offer:%o]', offer);
-                            await this._pc.setRemoteDescription(offer);
-                            const answer = await this._pc.createAnswer();
-                            if (!this._transportReady) {
-                                const localSdpObject = sdpTransform.parse(answer.sdp);
-                                await this._setupTransport({ localDtlsRole: 'client', localSdpObject });
-                            }
-                            logger.debug(
-                                'receiveDataChannel() | calling pc.setRemoteDescription() [answer:%o]',
-                                answer,
-                            );
-                            await this._pc.setLocalDescription(answer);
-                            this._hasDataChannelMediaSection = true;
-                        }
-                        return { dataChannel };
-                    }
-                    async _setupTransport({ localDtlsRole, localSdpObject }) {
-                        if (!localSdpObject) localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
-                        // Get our local DTLS parameters.
-                        const dtlsParameters = sdpCommonUtils.extractDtlsParameters({ sdpObject: localSdpObject });
-                        // Set our DTLS role.
-                        dtlsParameters.role = localDtlsRole;
-                        // Update the remote DTLS role in the SDP.
-                        this._remoteSdp.updateDtlsRole(localDtlsRole === 'client' ? 'server' : 'client');
-                        // Need to tell the remote transport about our parameters.
-                        await this.safeEmitAsPromise('@connect', { dtlsParameters });
-                        this._transportReady = true;
-                    }
-                    _assertSendDirection() {
-                        if (this._direction !== 'send') {
-                            throw new Error('method can just be called for handlers with "send" direction');
-                        }
-                    }
-                    _assertRecvDirection() {
-                        if (this._direction !== 'recv') {
-                            throw new Error('method can just be called for handlers with "recv" direction');
-                        }
-                    }
-                }
-                exports.Chrome70 = Chrome70;
-            },
+                audio: ortc.getSendingRemoteRtpParameters('audio', extendedRtpCapabilities),
+                video: ortc.getSendingRemoteRtpParameters('video', extendedRtpCapabilities)
+            };
+        this._pc = new RTCPeerConnection(Object.assign({ iceServers: iceServers || [], iceTransportPolicy: iceTransportPolicy || 'all', bundlePolicy: 'max-bundle', rtcpMuxPolicy: 'require', sdpSemantics: 'plan-b' }, additionalSettings), proprietaryConstraints);
+        // Handle RTCPeerConnection connection status.
+        this._pc.addEventListener('iceconnectionstatechange', () => {
+            switch (this._pc.iceConnectionState) {
+                case 'checking':
+                    this.emit('@connectionstatechange', 'connecting');
+                    break;
+                case 'connected':
+                case 'completed':
+                    this.emit('@connectionstatechange', 'connected');
+                    break;
+                case 'failed':
+                    this.emit('@connectionstatechange', 'failed');
+                    break;
+                case 'disconnected':
+                    this.emit('@connectionstatechange', 'disconnected');
+                    break;
+                case 'closed':
+                    this.emit('@connectionstatechange', 'closed');
+                    break;
+            }
+        });
+    }
+    async updateIceServers(iceServers) {
+        logger.debug('updateIceServers()');
+        const configuration = this._pc.getConfiguration();
+        configuration.iceServers = iceServers;
+        this._pc.setConfiguration(configuration);
+    }
+    async restartIce(iceParameters) {
+        logger.debug('restartIce()');
+        // Provide the remote SDP handler with new remote ICE parameters.
+        this._remoteSdp.updateIceParameters(iceParameters);
+        if (!this._transportReady)
+            return;
+        if (this._direction === 'send') {
+            const offer = await this._pc.createOffer({ iceRestart: true });
+            logger.debug('restartIce() | calling pc.setLocalDescription() [offer:%o]', offer);
+            await this._pc.setLocalDescription(offer);
+            const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
+            logger.debug('restartIce() | calling pc.setRemoteDescription() [answer:%o]', answer);
+            await this._pc.setRemoteDescription(answer);
+        }
+        else {
+            const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
+            logger.debug('restartIce() | calling pc.setRemoteDescription() [offer:%o]', offer);
+            await this._pc.setRemoteDescription(offer);
+            const answer = await this._pc.createAnswer();
+            logger.debug('restartIce() | calling pc.setLocalDescription() [answer:%o]', answer);
+            await this._pc.setLocalDescription(answer);
+        }
+    }
+    async getTransportStats() {
+        return this._pc.getStats();
+    }
+    async send({ track, encodings, codecOptions, codec }) {
+        this._assertSendDirection();
+        logger.debug('send() [kind:%s, track.id:%s]', track.kind, track.id);
+        if (codec) {
+            logger.warn('send() | codec selection is not available in %s handler', this.name);
+        }
+        this._sendStream.addTrack(track);
+        this._pc.addStream(this._sendStream);
+        let offer = await this._pc.createOffer();
+        let localSdpObject = sdpTransform.parse(offer.sdp);
+        let offerMediaObject;
+        const sendingRtpParameters = utils.clone(this._sendingRtpParametersByKind[track.kind], {});
+        sendingRtpParameters.codecs =
+            ortc.reduceCodecs(sendingRtpParameters.codecs);
+        const sendingRemoteRtpParameters = utils.clone(this._sendingRemoteRtpParametersByKind[track.kind], {});
+        sendingRemoteRtpParameters.codecs =
+            ortc.reduceCodecs(sendingRemoteRtpParameters.codecs);
+        if (!this._transportReady)
+            await this._setupTransport({ localDtlsRole: 'server', localSdpObject });
+        if (track.kind === 'video' && encodings && encodings.length > 1) {
+            logger.debug('send() | enabling simulcast');
+            localSdpObject = sdpTransform.parse(offer.sdp);
+            offerMediaObject = localSdpObject.media.find((m) => m.type === 'video');
+            sdpPlanBUtils.addLegacySimulcast({
+                offerMediaObject,
+                track,
+                numStreams: encodings.length
+            });
+            offer = { type: 'offer', sdp: sdpTransform.write(localSdpObject) };
+        }
+        logger.debug('send() | calling pc.setLocalDescription() [offer:%o]', offer);
+        await this._pc.setLocalDescription(offer);
+        localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
+        offerMediaObject = localSdpObject.media
+            .find((m) => m.type === track.kind);
+        // Set RTCP CNAME.
+        sendingRtpParameters.rtcp.cname =
+            sdpCommonUtils.getCname({ offerMediaObject });
+        // Set RTP encodings.
+        sendingRtpParameters.encodings =
+            sdpPlanBUtils.getRtpEncodings({ offerMediaObject, track });
+        // Complete encodings with given values.
+        if (encodings) {
+            for (let idx = 0; idx < sendingRtpParameters.encodings.length; ++idx) {
+                if (encodings[idx])
+                    Object.assign(sendingRtpParameters.encodings[idx], encodings[idx]);
+            }
+        }
+        // If VP8 and there is effective simulcast, add scalabilityMode to each
+        // encoding.
+        if (sendingRtpParameters.encodings.length > 1 &&
+            sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/vp8') {
+            for (const encoding of sendingRtpParameters.encodings) {
+                encoding.scalabilityMode = 'S1T3';
+            }
+        }
+        this._remoteSdp.send({
+            offerMediaObject,
+            offerRtpParameters: sendingRtpParameters,
+            answerRtpParameters: sendingRemoteRtpParameters,
+            codecOptions
+        });
+        const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
+        logger.debug('send() | calling pc.setRemoteDescription() [answer:%o]', answer);
+        await this._pc.setRemoteDescription(answer);
+        const localId = String(this._nextSendLocalId);
+        this._nextSendLocalId++;
+        // Insert into the map.
+        this._mapSendLocalIdTrack.set(localId, track);
+        return {
+            localId: localId,
+            rtpParameters: sendingRtpParameters
+        };
+    }
+    async stopSending(localId) {
+        this._assertSendDirection();
+        logger.debug('stopSending() [localId:%s]', localId);
+        const track = this._mapSendLocalIdTrack.get(localId);
+        if (!track)
+            throw new Error('track not found');
+        this._mapSendLocalIdTrack.delete(localId);
+        this._sendStream.removeTrack(track);
+        this._pc.addStream(this._sendStream);
+        const offer = await this._pc.createOffer();
+        logger.debug('stopSending() | calling pc.setLocalDescription() [offer:%o]', offer);
+        try {
+            await this._pc.setLocalDescription(offer);
+        }
+        catch (error) {
+            // NOTE: If there are no sending tracks, setLocalDescription() will fail with
+            // "Failed to create channels". If so, ignore it.
+            if (this._sendStream.getTracks().length === 0) {
+                logger.warn('stopSending() | ignoring expected error due no sending tracks: %s', error.toString());
+                return;
+            }
+            throw error;
+        }
+        if (this._pc.signalingState === 'stable')
+            return;
+        const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
+        logger.debug('stopSending() | calling pc.setRemoteDescription() [answer:%o]', answer);
+        await this._pc.setRemoteDescription(answer);
+    }
+    async replaceTrack(
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    localId, track) {
+        throw new errors_1.UnsupportedError('not implemented');
+    }
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    async setMaxSpatialLayer(localId, spatialLayer) {
+        throw new errors_1.UnsupportedError(' not implemented');
+    }
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    async setRtpEncodingParameters(localId, params) {
+        throw new errors_1.UnsupportedError('not supported');
+    }
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    async getSenderStats(localId) {
+        throw new errors_1.UnsupportedError('not implemented');
+    }
+    async sendDataChannel({ ordered, maxPacketLifeTime, maxRetransmits, label, protocol }) {
+        this._assertSendDirection();
+        const options = {
+            negotiated: true,
+            id: this._nextSendSctpStreamId,
+            ordered,
+            maxPacketLifeTime,
+            maxRetransmitTime: maxPacketLifeTime,
+            maxRetransmits,
+            protocol
+        };
+        logger.debug('sendDataChannel() [options:%o]', options);
+        const dataChannel = this._pc.createDataChannel(label, options);
+        // Increase next id.
+        this._nextSendSctpStreamId =
+            ++this._nextSendSctpStreamId % SCTP_NUM_STREAMS.MIS;
+        // If this is the first DataChannel we need to create the SDP answer with
+        // m=application section.
+        if (!this._hasDataChannelMediaSection) {
+            const offer = await this._pc.createOffer();
+            const localSdpObject = sdpTransform.parse(offer.sdp);
+            const offerMediaObject = localSdpObject.media
+                .find((m) => m.type === 'application');
+            if (!this._transportReady)
+                await this._setupTransport({ localDtlsRole: 'server', localSdpObject });
+            logger.debug('sendDataChannel() | calling pc.setLocalDescription() [offer:%o]', offer);
+            await this._pc.setLocalDescription(offer);
+            this._remoteSdp.sendSctpAssociation({ offerMediaObject });
+            const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
+            logger.debug('sendDataChannel() | calling pc.setRemoteDescription() [answer:%o]', answer);
+            await this._pc.setRemoteDescription(answer);
+            this._hasDataChannelMediaSection = true;
+        }
+        const sctpStreamParameters = {
+            streamId: options.id,
+            ordered: options.ordered,
+            maxPacketLifeTime: options.maxPacketLifeTime,
+            maxRetransmits: options.maxRetransmits
+        };
+        return { dataChannel, sctpStreamParameters };
+    }
+    async receive({ trackId, kind, rtpParameters }) {
+        this._assertRecvDirection();
+        logger.debug('receive() [trackId:%s, kind:%s]', trackId, kind);
+        const localId = trackId;
+        const mid = kind;
+        const streamId = rtpParameters.rtcp.cname;
+        this._remoteSdp.receive({
+            mid,
+            kind,
+            offerRtpParameters: rtpParameters,
+            streamId,
+            trackId
+        });
+        const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
+        logger.debug('receive() | calling pc.setRemoteDescription() [offer:%o]', offer);
+        await this._pc.setRemoteDescription(offer);
+        let answer = await this._pc.createAnswer();
+        const localSdpObject = sdpTransform.parse(answer.sdp);
+        const answerMediaObject = localSdpObject.media
+            .find((m) => String(m.mid) === mid);
+        // May need to modify codec parameters in the answer based on codec
+        // parameters in the offer.
+        sdpCommonUtils.applyCodecParameters({
+            offerRtpParameters: rtpParameters,
+            answerMediaObject
+        });
+        answer = { type: 'answer', sdp: sdpTransform.write(localSdpObject) };
+        if (!this._transportReady)
+            await this._setupTransport({ localDtlsRole: 'client', localSdpObject });
+        logger.debug('receive() | calling pc.setLocalDescription() [answer:%o]', answer);
+        await this._pc.setLocalDescription(answer);
+        const stream = this._pc.getRemoteStreams()
+            .find((s) => s.id === streamId);
+        const track = stream.getTrackById(localId);
+        if (!track)
+            throw new Error('remote track not found');
+        // Insert into the map.
+        this._mapRecvLocalIdInfo.set(localId, { mid, rtpParameters });
+        return { localId, track };
+    }
+    async stopReceiving(localId) {
+        this._assertRecvDirection();
+        logger.debug('stopReceiving() [localId:%s]', localId);
+        const { mid, rtpParameters } = this._mapRecvLocalIdInfo.get(localId) || {};
+        // Remove from the map.
+        this._mapRecvLocalIdInfo.delete(localId);
+        this._remoteSdp.planBStopReceiving({ mid: mid, offerRtpParameters: rtpParameters });
+        const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
+        logger.debug('stopReceiving() | calling pc.setRemoteDescription() [offer:%o]', offer);
+        await this._pc.setRemoteDescription(offer);
+        const answer = await this._pc.createAnswer();
+        logger.debug('stopReceiving() | calling pc.setLocalDescription() [answer:%o]', answer);
+        await this._pc.setLocalDescription(answer);
+    }
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    async getReceiverStats(localId) {
+        throw new errors_1.UnsupportedError('not implemented');
+    }
+    async receiveDataChannel({ sctpStreamParameters, label, protocol }) {
+        this._assertRecvDirection();
+        const { streamId, ordered, maxPacketLifeTime, maxRetransmits } = sctpStreamParameters;
+        const options = {
+            negotiated: true,
+            id: streamId,
+            ordered,
+            maxPacketLifeTime,
+            maxRetransmitTime: maxPacketLifeTime,
+            maxRetransmits,
+            protocol
+        };
+        logger.debug('receiveDataChannel() [options:%o]', options);
+        const dataChannel = this._pc.createDataChannel(label, options);
+        // If this is the first DataChannel we need to create the SDP offer with
+        // m=application section.
+        if (!this._hasDataChannelMediaSection) {
+            this._remoteSdp.receiveSctpAssociation({ oldDataChannelSpec: true });
+            const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
+            logger.debug('receiveDataChannel() | calling pc.setRemoteDescription() [offer:%o]', offer);
+            await this._pc.setRemoteDescription(offer);
+            const answer = await this._pc.createAnswer();
+            if (!this._transportReady) {
+                const localSdpObject = sdpTransform.parse(answer.sdp);
+                await this._setupTransport({ localDtlsRole: 'client', localSdpObject });
+            }
+            logger.debug('receiveDataChannel() | calling pc.setRemoteDescription() [answer:%o]', answer);
+            await this._pc.setLocalDescription(answer);
+            this._hasDataChannelMediaSection = true;
+        }
+        return { dataChannel };
+    }
+    async _setupTransport({ localDtlsRole, localSdpObject }) {
+        if (!localSdpObject)
+            localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
+        // Get our local DTLS parameters.
+        const dtlsParameters = sdpCommonUtils.extractDtlsParameters({ sdpObject: localSdpObject });
+        // Set our DTLS role.
+        dtlsParameters.role = localDtlsRole;
+        // Update the remote DTLS role in the SDP.
+        this._remoteSdp.updateDtlsRole(localDtlsRole === 'client' ? 'server' : 'client');
+        // Need to tell the remote transport about our parameters.
+        await this.safeEmitAsPromise('@connect', { dtlsParameters });
+        this._transportReady = true;
+    }
+    _assertSendDirection() {
+        if (this._direction !== 'send') {
+            throw new Error('method can just be called for handlers with "send" direction');
+        }
+    }
+    _assertRecvDirection() {
+        if (this._direction !== 'recv') {
+            throw new Error('method can just be called for handlers with "recv" direction');
+        }
+    }
+}
+exports.Chrome55 = Chrome55;
+
+},{"../Logger":13,"../errors":18,"../ortc":36,"../utils":39,"./HandlerInterface":25,"./sdp/RemoteSdp":31,"./sdp/commonUtils":32,"./sdp/planBUtils":33,"sdp-transform":44}],20:[function(require,module,exports){
+"use strict";
+var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
+}) : (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    o[k2] = m[k];
+}));
+var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
+    Object.defineProperty(o, "default", { enumerable: true, value: v });
+}) : function(o, v) {
+    o["default"] = v;
+});
+var __importStar = (this && this.__importStar) || function (mod) {
+    if (mod && mod.__esModule) return mod;
+    var result = {};
+    if (mod != null) for (var k in mod) if (k !== "default" && Object.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
+    __setModuleDefault(result, mod);
+    return result;
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.Chrome67 = void 0;
+const sdpTransform = __importStar(require("sdp-transform"));
+const Logger_1 = require("../Logger");
+const utils = __importStar(require("../utils"));
+const ortc = __importStar(require("../ortc"));
+const sdpCommonUtils = __importStar(require("./sdp/commonUtils"));
+const sdpPlanBUtils = __importStar(require("./sdp/planBUtils"));
+const HandlerInterface_1 = require("./HandlerInterface");
+const RemoteSdp_1 = require("./sdp/RemoteSdp");
+const logger = new Logger_1.Logger('Chrome67');
+const SCTP_NUM_STREAMS = { OS: 1024, MIS: 1024 };
+class Chrome67 extends HandlerInterface_1.HandlerInterface {
+    constructor() {
+        super();
+        // Local stream for sending.
+        this._sendStream = new MediaStream();
+        // Map of RTCRtpSender indexed by localId.
+        this._mapSendLocalIdRtpSender = new Map();
+        // Next sending localId.
+        this._nextSendLocalId = 0;
+        // Map of MID, RTP parameters and RTCRtpReceiver indexed by local id.
+        // Value is an Object with mid, rtpParameters and rtpReceiver.
+        this._mapRecvLocalIdInfo = new Map();
+        // Whether a DataChannel m=application section has been created.
+        this._hasDataChannelMediaSection = false;
+        // Sending DataChannel id value counter. Incremented for each new DataChannel.
+        this._nextSendSctpStreamId = 0;
+        // Got transport local and remote parameters.
+        this._transportReady = false;
+    }
+    /**
+     * Creates a factory function.
+     */
+    static createFactory() {
+        return () => new Chrome67();
+    }
+    get name() {
+        return 'Chrome67';
+    }
+    close() {
+        logger.debug('close()');
+        // Close RTCPeerConnection.
+        if (this._pc) {
+            try {
+                this._pc.close();
+            }
+            catch (error) { }
+        }
+    }
+    async getNativeRtpCapabilities() {
+        logger.debug('getNativeRtpCapabilities()');
+        const pc = new RTCPeerConnection({
+            iceServers: [],
+            iceTransportPolicy: 'all',
+            bundlePolicy: 'max-bundle',
+            rtcpMuxPolicy: 'require',
+            sdpSemantics: 'plan-b'
+        });
+        try {
+            const offer = await pc.createOffer({
+                offerToReceiveAudio: true,
+                offerToReceiveVideo: true
+            });
+            try {
+                pc.close();
+            }
+            catch (error) { }
+            const sdpObject = sdpTransform.parse(offer.sdp);
+            const nativeRtpCapabilities = sdpCommonUtils.extractRtpCapabilities({ sdpObject });
+            return nativeRtpCapabilities;
+        }
+        catch (error) {
+            try {
+                pc.close();
+            }
+            catch (error2) { }
+            throw error;
+        }
+    }
+    async getNativeSctpCapabilities() {
+        logger.debug('getNativeSctpCapabilities()');
+        return {
+            numStreams: SCTP_NUM_STREAMS
+        };
+    }
+    run({ direction, iceParameters, iceCandidates, dtlsParameters, sctpParameters, iceServers, iceTransportPolicy, additionalSettings, proprietaryConstraints, extendedRtpCapabilities }) {
+        logger.debug('run()');
+        this._direction = direction;
+        this._remoteSdp = new RemoteSdp_1.RemoteSdp({
+            iceParameters,
+            iceCandidates,
+            dtlsParameters,
+            sctpParameters,
+            planB: true
+        });
+        this._sendingRtpParametersByKind =
             {
-                '../Logger': 12,
-                '../ortc': 33,
-                '../scalabilityModes': 34,
-                '../utils': 36,
-                './HandlerInterface': 22,
-                './sdp/RemoteSdp': 28,
-                './sdp/commonUtils': 29,
-                './sdp/unifiedPlanUtils': 31,
-                'sdp-transform': 41,
-            },
-        ],
-        19: [
-            function (require, module, exports) {
-                'use strict';
-                Object.defineProperty(exports, '__esModule', { value: true });
-                const sdpTransform = require('sdp-transform');
-                const Logger_1 = require('../Logger');
-                const utils = require('../utils');
-                const ortc = require('../ortc');
-                const sdpCommonUtils = require('./sdp/commonUtils');
-                const sdpUnifiedPlanUtils = require('./sdp/unifiedPlanUtils');
-                const HandlerInterface_1 = require('./HandlerInterface');
-                const RemoteSdp_1 = require('./sdp/RemoteSdp');
-                const scalabilityModes_1 = require('../scalabilityModes');
-                const logger = new Logger_1.Logger('Chrome74');
-                const SCTP_NUM_STREAMS = { OS: 1024, MIS: 1024 };
-                class Chrome74 extends HandlerInterface_1.HandlerInterface {
-                    constructor() {
-                        super();
-                        // Map of RTCTransceivers indexed by MID.
-                        this._mapMidTransceiver = new Map();
-                        // Local stream for sending.
-                        this._sendStream = new MediaStream();
-                        // Whether a DataChannel m=application section has been created.
-                        this._hasDataChannelMediaSection = false;
-                        // Sending DataChannel id value counter. Incremented for each new DataChannel.
-                        this._nextSendSctpStreamId = 0;
-                        // Got transport local and remote parameters.
-                        this._transportReady = false;
-                    }
-                    /**
-                     * Creates a factory function.
-                     */
-                    static createFactory() {
-                        return () => new Chrome74();
-                    }
-                    get name() {
-                        return 'Chrome74';
-                    }
-                    close() {
-                        logger.debug('close()');
-                        // Close RTCPeerConnection.
-                        if (this._pc) {
-                            try {
-                                this._pc.close();
-                            } catch (error) {}
-                        }
-                    }
-                    async getNativeRtpCapabilities() {
-                        logger.debug('getNativeRtpCapabilities()');
-                        const pc = new RTCPeerConnection({
-                            iceServers: [],
-                            iceTransportPolicy: 'all',
-                            bundlePolicy: 'max-bundle',
-                            rtcpMuxPolicy: 'require',
-                            sdpSemantics: 'unified-plan',
-                        });
-                        try {
-                            pc.addTransceiver('audio');
-                            pc.addTransceiver('video');
-                            const offer = await pc.createOffer();
-                            try {
-                                pc.close();
-                            } catch (error) {}
-                            const sdpObject = sdpTransform.parse(offer.sdp);
-                            const nativeRtpCapabilities = sdpCommonUtils.extractRtpCapabilities({ sdpObject });
-                            return nativeRtpCapabilities;
-                        } catch (error) {
-                            try {
-                                pc.close();
-                            } catch (error2) {}
-                            throw error;
-                        }
-                    }
-                    async getNativeSctpCapabilities() {
-                        logger.debug('getNativeSctpCapabilities()');
-                        return {
-                            numStreams: SCTP_NUM_STREAMS,
-                        };
-                    }
-                    run({
-                        direction,
-                        iceParameters,
-                        iceCandidates,
-                        dtlsParameters,
-                        sctpParameters,
-                        iceServers,
-                        iceTransportPolicy,
-                        additionalSettings,
-                        proprietaryConstraints,
-                        extendedRtpCapabilities,
-                    }) {
-                        logger.debug('run()');
-                        this._direction = direction;
-                        this._remoteSdp = new RemoteSdp_1.RemoteSdp({
-                            iceParameters,
-                            iceCandidates,
-                            dtlsParameters,
-                            sctpParameters,
-                        });
-                        this._sendingRtpParametersByKind = {
-                            audio: ortc.getSendingRtpParameters('audio', extendedRtpCapabilities),
-                            video: ortc.getSendingRtpParameters('video', extendedRtpCapabilities),
-                        };
-                        this._sendingRemoteRtpParametersByKind = {
-                            audio: ortc.getSendingRemoteRtpParameters('audio', extendedRtpCapabilities),
-                            video: ortc.getSendingRemoteRtpParameters('video', extendedRtpCapabilities),
-                        };
-                        this._pc = new RTCPeerConnection(
-                            {
-                                iceServers: iceServers || [],
-                                iceTransportPolicy: iceTransportPolicy || 'all',
-                                bundlePolicy: 'max-bundle',
-                                rtcpMuxPolicy: 'require',
-                                sdpSemantics: 'unified-plan',
-                                ...additionalSettings,
-                            },
-                            proprietaryConstraints,
-                        );
-                        // Handle RTCPeerConnection connection status.
-                        this._pc.addEventListener('iceconnectionstatechange', () => {
-                            switch (this._pc.iceConnectionState) {
-                                case 'checking':
-                                    this.emit('@connectionstatechange', 'connecting');
-                                    break;
-                                case 'connected':
-                                case 'completed':
-                                    this.emit('@connectionstatechange', 'connected');
-                                    break;
-                                case 'failed':
-                                    this.emit('@connectionstatechange', 'failed');
-                                    break;
-                                case 'disconnected':
-                                    this.emit('@connectionstatechange', 'disconnected');
-                                    break;
-                                case 'closed':
-                                    this.emit('@connectionstatechange', 'closed');
-                                    break;
-                            }
-                        });
-                    }
-                    async updateIceServers(iceServers) {
-                        logger.debug('updateIceServers()');
-                        const configuration = this._pc.getConfiguration();
-                        configuration.iceServers = iceServers;
-                        this._pc.setConfiguration(configuration);
-                    }
-                    async restartIce(iceParameters) {
-                        logger.debug('restartIce()');
-                        // Provide the remote SDP handler with new remote ICE parameters.
-                        this._remoteSdp.updateIceParameters(iceParameters);
-                        if (!this._transportReady) return;
-                        if (this._direction === 'send') {
-                            const offer = await this._pc.createOffer({ iceRestart: true });
-                            logger.debug('restartIce() | calling pc.setLocalDescription() [offer:%o]', offer);
-                            await this._pc.setLocalDescription(offer);
-                            const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
-                            logger.debug('restartIce() | calling pc.setRemoteDescription() [answer:%o]', answer);
-                            await this._pc.setRemoteDescription(answer);
-                        } else {
-                            const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
-                            logger.debug('restartIce() | calling pc.setRemoteDescription() [offer:%o]', offer);
-                            await this._pc.setRemoteDescription(offer);
-                            const answer = await this._pc.createAnswer();
-                            logger.debug('restartIce() | calling pc.setLocalDescription() [answer:%o]', answer);
-                            await this._pc.setLocalDescription(answer);
-                        }
-                    }
-                    async getTransportStats() {
-                        return this._pc.getStats();
-                    }
-                    async send({ track, encodings, codecOptions, codec }) {
-                        this._assertSendDirection();
-                        logger.debug('send() [kind:%s, track.id:%s]', track.kind, track.id);
-                        if (encodings && encodings.length > 1) {
-                            encodings.forEach((encoding, idx) => {
-                                encoding.rid = `r${idx}`;
-                            });
-                        }
-                        const sendingRtpParameters = utils.clone(this._sendingRtpParametersByKind[track.kind]);
-                        // This may throw.
-                        sendingRtpParameters.codecs = ortc.reduceCodecs(sendingRtpParameters.codecs, codec);
-                        const sendingRemoteRtpParameters = utils.clone(
-                            this._sendingRemoteRtpParametersByKind[track.kind],
-                        );
-                        // This may throw.
-                        sendingRemoteRtpParameters.codecs = ortc.reduceCodecs(sendingRemoteRtpParameters.codecs, codec);
-                        const mediaSectionIdx = this._remoteSdp.getNextMediaSectionIdx();
-                        const transceiver = this._pc.addTransceiver(track, {
-                            direction: 'sendonly',
-                            streams: [this._sendStream],
-                            sendEncodings: encodings,
-                        });
-                        let offer = await this._pc.createOffer();
-                        let localSdpObject = sdpTransform.parse(offer.sdp);
-                        let offerMediaObject;
-                        if (!this._transportReady)
-                            await this._setupTransport({ localDtlsRole: 'server', localSdpObject });
-                        // Special case for VP9 with SVC.
-                        let hackVp9Svc = false;
-                        const layers = scalabilityModes_1.parse((encodings || [{}])[0].scalabilityMode);
-                        if (
-                            encodings &&
-                            encodings.length === 1 &&
-                            layers.spatialLayers > 1 &&
-                            sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/vp9'
-                        ) {
-                            logger.debug('send() | enabling legacy simulcast for VP9 SVC');
-                            hackVp9Svc = true;
-                            localSdpObject = sdpTransform.parse(offer.sdp);
-                            offerMediaObject = localSdpObject.media[mediaSectionIdx.idx];
-                            sdpUnifiedPlanUtils.addLegacySimulcast({
-                                offerMediaObject,
-                                numStreams: layers.spatialLayers,
-                            });
-                            offer = { type: 'offer', sdp: sdpTransform.write(localSdpObject) };
-                        }
-                        logger.debug('send() | calling pc.setLocalDescription() [offer:%o]', offer);
-                        await this._pc.setLocalDescription(offer);
-                        // We can now get the transceiver.mid.
-                        const localId = transceiver.mid;
-                        // Set MID.
-                        sendingRtpParameters.mid = localId;
-                        localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
-                        offerMediaObject = localSdpObject.media[mediaSectionIdx.idx];
-                        // Set RTCP CNAME.
-                        sendingRtpParameters.rtcp.cname = sdpCommonUtils.getCname({ offerMediaObject });
-                        // Set RTP encodings by parsing the SDP offer if no encodings are given.
-                        if (!encodings) {
-                            sendingRtpParameters.encodings = sdpUnifiedPlanUtils.getRtpEncodings({ offerMediaObject });
-                        }
-                        // Set RTP encodings by parsing the SDP offer and complete them with given
-                        // one if just a single encoding has been given.
-                        else if (encodings.length === 1) {
-                            let newEncodings = sdpUnifiedPlanUtils.getRtpEncodings({ offerMediaObject });
-                            Object.assign(newEncodings[0], encodings[0]);
-                            // Hack for VP9 SVC.
-                            if (hackVp9Svc) newEncodings = [newEncodings[0]];
-                            sendingRtpParameters.encodings = newEncodings;
-                        }
-                        // Otherwise if more than 1 encoding are given use them verbatim.
-                        else {
-                            sendingRtpParameters.encodings = encodings;
-                        }
-                        // If VP8 or H264 and there is effective simulcast, add scalabilityMode to
-                        // each encoding.
-                        if (
-                            sendingRtpParameters.encodings.length > 1 &&
-                            (sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/vp8' ||
-                                sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/h264')
-                        ) {
-                            for (const encoding of sendingRtpParameters.encodings) {
-                                encoding.scalabilityMode = 'S1T3';
-                            }
-                        }
-                        this._remoteSdp.send({
-                            offerMediaObject,
-                            reuseMid: mediaSectionIdx.reuseMid,
-                            offerRtpParameters: sendingRtpParameters,
-                            answerRtpParameters: sendingRemoteRtpParameters,
-                            codecOptions,
-                            extmapAllowMixed: true,
-                        });
-                        const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
-                        logger.debug('send() | calling pc.setRemoteDescription() [answer:%o]', answer);
-                        await this._pc.setRemoteDescription(answer);
-                        // Store in the map.
-                        this._mapMidTransceiver.set(localId, transceiver);
-                        return {
-                            localId,
-                            rtpParameters: sendingRtpParameters,
-                            rtpSender: transceiver.sender,
-                        };
-                    }
-                    async stopSending(localId) {
-                        this._assertSendDirection();
-                        logger.debug('stopSending() [localId:%s]', localId);
-                        const transceiver = this._mapMidTransceiver.get(localId);
-                        if (!transceiver) throw new Error('associated RTCRtpTransceiver not found');
-                        transceiver.sender.replaceTrack(null);
-                        this._pc.removeTrack(transceiver.sender);
-                        this._remoteSdp.closeMediaSection(transceiver.mid);
-                        const offer = await this._pc.createOffer();
-                        logger.debug('stopSending() | calling pc.setLocalDescription() [offer:%o]', offer);
-                        await this._pc.setLocalDescription(offer);
-                        const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
-                        logger.debug('stopSending() | calling pc.setRemoteDescription() [answer:%o]', answer);
-                        await this._pc.setRemoteDescription(answer);
-                    }
-                    async replaceTrack(localId, track) {
-                        this._assertSendDirection();
-                        if (track) {
-                            logger.debug('replaceTrack() [localId:%s, track.id:%s]', localId, track.id);
-                        } else {
-                            logger.debug('replaceTrack() [localId:%s, no track]', localId);
-                        }
-                        const transceiver = this._mapMidTransceiver.get(localId);
-                        if (!transceiver) throw new Error('associated RTCRtpTransceiver not found');
-                        await transceiver.sender.replaceTrack(track);
-                    }
-                    async setMaxSpatialLayer(localId, spatialLayer) {
-                        this._assertSendDirection();
-                        logger.debug('setMaxSpatialLayer() [localId:%s, spatialLayer:%s]', localId, spatialLayer);
-                        const transceiver = this._mapMidTransceiver.get(localId);
-                        if (!transceiver) throw new Error('associated RTCRtpTransceiver not found');
-                        const parameters = transceiver.sender.getParameters();
-                        parameters.encodings.forEach((encoding, idx) => {
-                            if (idx <= spatialLayer) encoding.active = true;
-                            else encoding.active = false;
-                        });
-                        await transceiver.sender.setParameters(parameters);
-                    }
-                    async setRtpEncodingParameters(localId, params) {
-                        this._assertSendDirection();
-                        logger.debug('setRtpEncodingParameters() [localId:%s, params:%o]', localId, params);
-                        const transceiver = this._mapMidTransceiver.get(localId);
-                        if (!transceiver) throw new Error('associated RTCRtpTransceiver not found');
-                        const parameters = transceiver.sender.getParameters();
-                        parameters.encodings.forEach((encoding, idx) => {
-                            parameters.encodings[idx] = { ...encoding, ...params };
-                        });
-                        await transceiver.sender.setParameters(parameters);
-                    }
-                    async getSenderStats(localId) {
-                        this._assertSendDirection();
-                        const transceiver = this._mapMidTransceiver.get(localId);
-                        if (!transceiver) throw new Error('associated RTCRtpTransceiver not found');
-                        return transceiver.sender.getStats();
-                    }
-                    async sendDataChannel({ ordered, maxPacketLifeTime, maxRetransmits, label, protocol, priority }) {
-                        this._assertSendDirection();
-                        const options = {
-                            negotiated: true,
-                            id: this._nextSendSctpStreamId,
-                            ordered,
-                            maxPacketLifeTime,
-                            maxRetransmits,
-                            protocol,
-                            priority,
-                        };
-                        logger.debug('sendDataChannel() [options:%o]', options);
-                        const dataChannel = this._pc.createDataChannel(label, options);
-                        // Increase next id.
-                        this._nextSendSctpStreamId = ++this._nextSendSctpStreamId % SCTP_NUM_STREAMS.MIS;
-                        // If this is the first DataChannel we need to create the SDP answer with
-                        // m=application section.
-                        if (!this._hasDataChannelMediaSection) {
-                            const offer = await this._pc.createOffer();
-                            const localSdpObject = sdpTransform.parse(offer.sdp);
-                            const offerMediaObject = localSdpObject.media.find((m) => m.type === 'application');
-                            if (!this._transportReady)
-                                await this._setupTransport({ localDtlsRole: 'server', localSdpObject });
-                            logger.debug('sendDataChannel() | calling pc.setLocalDescription() [offer:%o]', offer);
-                            await this._pc.setLocalDescription(offer);
-                            this._remoteSdp.sendSctpAssociation({ offerMediaObject });
-                            const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
-                            logger.debug('sendDataChannel() | calling pc.setRemoteDescription() [answer:%o]', answer);
-                            await this._pc.setRemoteDescription(answer);
-                            this._hasDataChannelMediaSection = true;
-                        }
-                        const sctpStreamParameters = {
-                            streamId: options.id,
-                            ordered: options.ordered,
-                            maxPacketLifeTime: options.maxPacketLifeTime,
-                            maxRetransmits: options.maxRetransmits,
-                        };
-                        return { dataChannel, sctpStreamParameters };
-                    }
-                    async receive({ trackId, kind, rtpParameters }) {
-                        this._assertRecvDirection();
-                        logger.debug('receive() [trackId:%s, kind:%s]', trackId, kind);
-                        const localId = rtpParameters.mid || String(this._mapMidTransceiver.size);
-                        this._remoteSdp.receive({
-                            mid: localId,
-                            kind,
-                            offerRtpParameters: rtpParameters,
-                            streamId: rtpParameters.rtcp.cname,
-                            trackId,
-                        });
-                        const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
-                        logger.debug('receive() | calling pc.setRemoteDescription() [offer:%o]', offer);
-                        await this._pc.setRemoteDescription(offer);
-                        let answer = await this._pc.createAnswer();
-                        const localSdpObject = sdpTransform.parse(answer.sdp);
-                        const answerMediaObject = localSdpObject.media.find((m) => String(m.mid) === localId);
-                        // May need to modify codec parameters in the answer based on codec
-                        // parameters in the offer.
-                        sdpCommonUtils.applyCodecParameters({
-                            offerRtpParameters: rtpParameters,
-                            answerMediaObject,
-                        });
-                        answer = { type: 'answer', sdp: sdpTransform.write(localSdpObject) };
-                        if (!this._transportReady)
-                            await this._setupTransport({ localDtlsRole: 'client', localSdpObject });
-                        logger.debug('receive() | calling pc.setLocalDescription() [answer:%o]', answer);
-                        await this._pc.setLocalDescription(answer);
-                        const transceiver = this._pc.getTransceivers().find((t) => t.mid === localId);
-                        if (!transceiver) throw new Error('new RTCRtpTransceiver not found');
-                        // Store in the map.
-                        this._mapMidTransceiver.set(localId, transceiver);
-                        return {
-                            localId,
-                            track: transceiver.receiver.track,
-                            rtpReceiver: transceiver.receiver,
-                        };
-                    }
-                    async stopReceiving(localId) {
-                        this._assertRecvDirection();
-                        logger.debug('stopReceiving() [localId:%s]', localId);
-                        const transceiver = this._mapMidTransceiver.get(localId);
-                        if (!transceiver) throw new Error('associated RTCRtpTransceiver not found');
-                        this._remoteSdp.closeMediaSection(transceiver.mid);
-                        const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
-                        logger.debug('stopReceiving() | calling pc.setRemoteDescription() [offer:%o]', offer);
-                        await this._pc.setRemoteDescription(offer);
-                        const answer = await this._pc.createAnswer();
-                        logger.debug('stopReceiving() | calling pc.setLocalDescription() [answer:%o]', answer);
-                        await this._pc.setLocalDescription(answer);
-                    }
-                    async getReceiverStats(localId) {
-                        this._assertRecvDirection();
-                        const transceiver = this._mapMidTransceiver.get(localId);
-                        if (!transceiver) throw new Error('associated RTCRtpTransceiver not found');
-                        return transceiver.receiver.getStats();
-                    }
-                    async receiveDataChannel({ sctpStreamParameters, label, protocol }) {
-                        this._assertRecvDirection();
-                        const { streamId, ordered, maxPacketLifeTime, maxRetransmits } = sctpStreamParameters;
-                        const options = {
-                            negotiated: true,
-                            id: streamId,
-                            ordered,
-                            maxPacketLifeTime,
-                            maxRetransmits,
-                            protocol,
-                        };
-                        logger.debug('receiveDataChannel() [options:%o]', options);
-                        const dataChannel = this._pc.createDataChannel(label, options);
-                        // If this is the first DataChannel we need to create the SDP offer with
-                        // m=application section.
-                        if (!this._hasDataChannelMediaSection) {
-                            this._remoteSdp.receiveSctpAssociation();
-                            const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
-                            logger.debug('receiveDataChannel() | calling pc.setRemoteDescription() [offer:%o]', offer);
-                            await this._pc.setRemoteDescription(offer);
-                            const answer = await this._pc.createAnswer();
-                            if (!this._transportReady) {
-                                const localSdpObject = sdpTransform.parse(answer.sdp);
-                                await this._setupTransport({ localDtlsRole: 'client', localSdpObject });
-                            }
-                            logger.debug(
-                                'receiveDataChannel() | calling pc.setRemoteDescription() [answer:%o]',
-                                answer,
-                            );
-                            await this._pc.setLocalDescription(answer);
-                            this._hasDataChannelMediaSection = true;
-                        }
-                        return { dataChannel };
-                    }
-                    async _setupTransport({ localDtlsRole, localSdpObject }) {
-                        if (!localSdpObject) localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
-                        // Get our local DTLS parameters.
-                        const dtlsParameters = sdpCommonUtils.extractDtlsParameters({ sdpObject: localSdpObject });
-                        // Set our DTLS role.
-                        dtlsParameters.role = localDtlsRole;
-                        // Update the remote DTLS role in the SDP.
-                        this._remoteSdp.updateDtlsRole(localDtlsRole === 'client' ? 'server' : 'client');
-                        // Need to tell the remote transport about our parameters.
-                        await this.safeEmitAsPromise('@connect', { dtlsParameters });
-                        this._transportReady = true;
-                    }
-                    _assertSendDirection() {
-                        if (this._direction !== 'send') {
-                            throw new Error('method can just be called for handlers with "send" direction');
-                        }
-                    }
-                    _assertRecvDirection() {
-                        if (this._direction !== 'recv') {
-                            throw new Error('method can just be called for handlers with "recv" direction');
-                        }
-                    }
-                }
-                exports.Chrome74 = Chrome74;
-            },
+                audio: ortc.getSendingRtpParameters('audio', extendedRtpCapabilities),
+                video: ortc.getSendingRtpParameters('video', extendedRtpCapabilities)
+            };
+        this._sendingRemoteRtpParametersByKind =
             {
-                '../Logger': 12,
-                '../ortc': 33,
-                '../scalabilityModes': 34,
-                '../utils': 36,
-                './HandlerInterface': 22,
-                './sdp/RemoteSdp': 28,
-                './sdp/commonUtils': 29,
-                './sdp/unifiedPlanUtils': 31,
-                'sdp-transform': 41,
-            },
-        ],
-        20: [
-            function (require, module, exports) {
-                'use strict';
-                Object.defineProperty(exports, '__esModule', { value: true });
-                const Logger_1 = require('../Logger');
-                const errors_1 = require('../errors');
-                const utils = require('../utils');
-                const ortc = require('../ortc');
-                const edgeUtils = require('./ortc/edgeUtils');
-                const HandlerInterface_1 = require('./HandlerInterface');
-                const logger = new Logger_1.Logger('Edge11');
-                class Edge11 extends HandlerInterface_1.HandlerInterface {
-                    constructor() {
-                        super();
-                        // Map of RTCRtpSenders indexed by id.
-                        this._rtpSenders = new Map();
-                        // Map of RTCRtpReceivers indexed by id.
-                        this._rtpReceivers = new Map();
-                        // Next localId for sending tracks.
-                        this._nextSendLocalId = 0;
-                        // Got transport local and remote parameters.
-                        this._transportReady = false;
-                    }
-                    /**
-                     * Creates a factory function.
-                     */
-                    static createFactory() {
-                        return () => new Edge11();
-                    }
-                    get name() {
-                        return 'Edge11';
-                    }
-                    close() {
-                        logger.debug('close()');
-                        // Close the ICE gatherer.
-                        // NOTE: Not yet implemented by Edge.
-                        try {
-                            this._iceGatherer.close();
-                        } catch (error) {}
-                        // Close the ICE transport.
-                        try {
-                            this._iceTransport.stop();
-                        } catch (error) {}
-                        // Close the DTLS transport.
-                        try {
-                            this._dtlsTransport.stop();
-                        } catch (error) {}
-                        // Close RTCRtpSenders.
-                        for (const rtpSender of this._rtpSenders.values()) {
-                            try {
-                                rtpSender.stop();
-                            } catch (error) {}
-                        }
-                        // Close RTCRtpReceivers.
-                        for (const rtpReceiver of this._rtpReceivers.values()) {
-                            try {
-                                rtpReceiver.stop();
-                            } catch (error) {}
-                        }
-                    }
-                    async getNativeRtpCapabilities() {
-                        logger.debug('getNativeRtpCapabilities()');
-                        return edgeUtils.getCapabilities();
-                    }
-                    async getNativeSctpCapabilities() {
-                        logger.debug('getNativeSctpCapabilities()');
-                        return {
-                            numStreams: { OS: 0, MIS: 0 },
-                        };
-                    }
-                    run({
-                        direction, // eslint-disable-line @typescript-eslint/no-unused-vars
-                        iceParameters,
-                        iceCandidates,
-                        dtlsParameters,
-                        sctpParameters, // eslint-disable-line @typescript-eslint/no-unused-vars
-                        iceServers,
-                        iceTransportPolicy,
-                        additionalSettings, // eslint-disable-line @typescript-eslint/no-unused-vars
-                        proprietaryConstraints, // eslint-disable-line @typescript-eslint/no-unused-vars
-                        extendedRtpCapabilities,
-                    }) {
-                        logger.debug('run()');
-                        this._sendingRtpParametersByKind = {
-                            audio: ortc.getSendingRtpParameters('audio', extendedRtpCapabilities),
-                            video: ortc.getSendingRtpParameters('video', extendedRtpCapabilities),
-                        };
-                        this._remoteIceParameters = iceParameters;
-                        this._remoteIceCandidates = iceCandidates;
-                        this._remoteDtlsParameters = dtlsParameters;
-                        this._cname = `CNAME-${utils.generateRandomNumber()}`;
-                        this._setIceGatherer({ iceServers, iceTransportPolicy });
-                        this._setIceTransport();
-                        this._setDtlsTransport();
-                    }
-                    // eslint-disable-next-line @typescript-eslint/no-unused-vars
-                    async updateIceServers(iceServers) {
-                        // NOTE: Edge 11 does not implement iceGatherer.gater().
-                        throw new errors_1.UnsupportedError('not supported');
-                    }
-                    async restartIce(iceParameters) {
-                        logger.debug('restartIce()');
-                        this._remoteIceParameters = iceParameters;
-                        if (!this._transportReady) return;
-                        logger.debug('restartIce() | calling iceTransport.start()');
-                        this._iceTransport.start(this._iceGatherer, iceParameters, 'controlling');
-                        for (const candidate of this._remoteIceCandidates) {
-                            this._iceTransport.addRemoteCandidate(candidate);
-                        }
-                        this._iceTransport.addRemoteCandidate({});
-                    }
-                    async getTransportStats() {
-                        return this._iceTransport.getStats();
-                    }
-                    async send(
-                        // eslint-disable-next-line @typescript-eslint/no-unused-vars
-                        { track, encodings, codecOptions, codec },
-                    ) {
-                        logger.debug('send() [kind:%s, track.id:%s]', track.kind, track.id);
-                        if (!this._transportReady) await this._setupTransport({ localDtlsRole: 'server' });
-                        logger.debug('send() | calling new RTCRtpSender()');
-                        const rtpSender = new RTCRtpSender(track, this._dtlsTransport);
-                        const rtpParameters = utils.clone(this._sendingRtpParametersByKind[track.kind]);
-                        rtpParameters.codecs = ortc.reduceCodecs(rtpParameters.codecs, codec);
-                        const useRtx = rtpParameters.codecs.some((_codec) => /.+\/rtx$/i.test(_codec.mimeType));
-                        if (!encodings) encodings = [{}];
-                        for (const encoding of encodings) {
-                            encoding.ssrc = utils.generateRandomNumber();
-                            if (useRtx) encoding.rtx = { ssrc: utils.generateRandomNumber() };
-                        }
-                        rtpParameters.encodings = encodings;
-                        // Fill RTCRtpParameters.rtcp.
-                        rtpParameters.rtcp = {
-                            cname: this._cname,
-                            reducedSize: true,
-                            mux: true,
-                        };
-                        // NOTE: Convert our standard RTCRtpParameters into those that Edge
-                        // expects.
-                        const edgeRtpParameters = edgeUtils.mangleRtpParameters(rtpParameters);
-                        logger.debug('send() | calling rtpSender.send() [params:%o]', edgeRtpParameters);
-                        await rtpSender.send(edgeRtpParameters);
-                        const localId = String(this._nextSendLocalId);
-                        this._nextSendLocalId++;
-                        // Store it.
-                        this._rtpSenders.set(localId, rtpSender);
-                        return { localId, rtpParameters, rtpSender };
-                    }
-                    async stopSending(localId) {
-                        logger.debug('stopSending() [localId:%s]', localId);
-                        const rtpSender = this._rtpSenders.get(localId);
-                        if (!rtpSender) throw new Error('RTCRtpSender not found');
-                        this._rtpSenders.delete(localId);
-                        try {
-                            logger.debug('stopSending() | calling rtpSender.stop()');
-                            rtpSender.stop();
-                        } catch (error) {
-                            logger.warn('stopSending() | rtpSender.stop() failed:%o', error);
-                            throw error;
-                        }
-                    }
-                    async replaceTrack(localId, track) {
-                        if (track) {
-                            logger.debug('replaceTrack() [localId:%s, track.id:%s]', localId, track.id);
-                        } else {
-                            logger.debug('replaceTrack() [localId:%s, no track]', localId);
-                        }
-                        const rtpSender = this._rtpSenders.get(localId);
-                        if (!rtpSender) throw new Error('RTCRtpSender not found');
-                        rtpSender.setTrack(track);
-                    }
-                    async setMaxSpatialLayer(localId, spatialLayer) {
-                        logger.debug('setMaxSpatialLayer() [localId:%s, spatialLayer:%s]', localId, spatialLayer);
-                        const rtpSender = this._rtpSenders.get(localId);
-                        if (!rtpSender) throw new Error('RTCRtpSender not found');
-                        const parameters = rtpSender.getParameters();
-                        parameters.encodings.forEach((encoding, idx) => {
-                            if (idx <= spatialLayer) encoding.active = true;
-                            else encoding.active = false;
-                        });
-                        await rtpSender.setParameters(parameters);
-                    }
-                    async setRtpEncodingParameters(localId, params) {
-                        logger.debug('setRtpEncodingParameters() [localId:%s, params:%o]', localId, params);
-                        const rtpSender = this._rtpSenders.get(localId);
-                        if (!rtpSender) throw new Error('RTCRtpSender not found');
-                        const parameters = rtpSender.getParameters();
-                        parameters.encodings.forEach((encoding, idx) => {
-                            parameters.encodings[idx] = { ...encoding, ...params };
-                        });
-                        await rtpSender.setParameters(parameters);
-                    }
-                    async getSenderStats(localId) {
-                        const rtpSender = this._rtpSenders.get(localId);
-                        if (!rtpSender) throw new Error('RTCRtpSender not found');
-                        return rtpSender.getStats();
-                    }
-                    async sendDataChannel(
-                        // eslint-disable-next-line @typescript-eslint/no-unused-vars
-                        options,
-                    ) {
-                        throw new errors_1.UnsupportedError('not implemented');
-                    }
-                    async receive({ trackId, kind, rtpParameters }) {
-                        logger.debug('receive() [trackId:%s, kind:%s]', trackId, kind);
-                        if (!this._transportReady) await this._setupTransport({ localDtlsRole: 'server' });
-                        logger.debug('receive() | calling new RTCRtpReceiver()');
-                        const rtpReceiver = new RTCRtpReceiver(this._dtlsTransport, kind);
-                        rtpReceiver.addEventListener('error', (event) => {
-                            logger.error('rtpReceiver "error" event [event:%o]', event);
-                        });
-                        // NOTE: Convert our standard RTCRtpParameters into those that Edge
-                        // expects.
-                        const edgeRtpParameters = edgeUtils.mangleRtpParameters(rtpParameters);
-                        logger.debug('receive() | calling rtpReceiver.receive() [params:%o]', edgeRtpParameters);
-                        await rtpReceiver.receive(edgeRtpParameters);
-                        const localId = trackId;
-                        // Store it.
-                        this._rtpReceivers.set(localId, rtpReceiver);
-                        return {
-                            localId,
-                            track: rtpReceiver.track,
-                            rtpReceiver,
-                        };
-                    }
-                    async stopReceiving(localId) {
-                        logger.debug('stopReceiving() [localId:%s]', localId);
-                        const rtpReceiver = this._rtpReceivers.get(localId);
-                        if (!rtpReceiver) throw new Error('RTCRtpReceiver not found');
-                        this._rtpReceivers.delete(localId);
-                        try {
-                            logger.debug('stopReceiving() | calling rtpReceiver.stop()');
-                            rtpReceiver.stop();
-                        } catch (error) {
-                            logger.warn('stopReceiving() | rtpReceiver.stop() failed:%o', error);
-                        }
-                    }
-                    async getReceiverStats(localId) {
-                        const rtpReceiver = this._rtpReceivers.get(localId);
-                        if (!rtpReceiver) throw new Error('RTCRtpReceiver not found');
-                        return rtpReceiver.getStats();
-                    }
-                    async receiveDataChannel(
-                        // eslint-disable-next-line @typescript-eslint/no-unused-vars
-                        options,
-                    ) {
-                        throw new errors_1.UnsupportedError('not implemented');
-                    }
-                    _setIceGatherer({ iceServers, iceTransportPolicy }) {
-                        const iceGatherer = new RTCIceGatherer({
-                            iceServers: iceServers || [],
-                            gatherPolicy: iceTransportPolicy || 'all',
-                        });
-                        iceGatherer.addEventListener('error', (event) => {
-                            logger.error('iceGatherer "error" event [event:%o]', event);
-                        });
-                        // NOTE: Not yet implemented by Edge, which starts gathering automatically.
-                        try {
-                            iceGatherer.gather();
-                        } catch (error) {
-                            logger.debug('_setIceGatherer() | iceGatherer.gather() failed: %s', error.toString());
-                        }
-                        this._iceGatherer = iceGatherer;
-                    }
-                    _setIceTransport() {
-                        const iceTransport = new RTCIceTransport(this._iceGatherer);
-                        // NOTE: Not yet implemented by Edge.
-                        iceTransport.addEventListener('statechange', () => {
-                            switch (iceTransport.state) {
-                                case 'checking':
-                                    this.emit('@connectionstatechange', 'connecting');
-                                    break;
-                                case 'connected':
-                                case 'completed':
-                                    this.emit('@connectionstatechange', 'connected');
-                                    break;
-                                case 'failed':
-                                    this.emit('@connectionstatechange', 'failed');
-                                    break;
-                                case 'disconnected':
-                                    this.emit('@connectionstatechange', 'disconnected');
-                                    break;
-                                case 'closed':
-                                    this.emit('@connectionstatechange', 'closed');
-                                    break;
-                            }
-                        });
-                        // NOTE: Not standard, but implemented by Edge.
-                        iceTransport.addEventListener('icestatechange', () => {
-                            switch (iceTransport.state) {
-                                case 'checking':
-                                    this.emit('@connectionstatechange', 'connecting');
-                                    break;
-                                case 'connected':
-                                case 'completed':
-                                    this.emit('@connectionstatechange', 'connected');
-                                    break;
-                                case 'failed':
-                                    this.emit('@connectionstatechange', 'failed');
-                                    break;
-                                case 'disconnected':
-                                    this.emit('@connectionstatechange', 'disconnected');
-                                    break;
-                                case 'closed':
-                                    this.emit('@connectionstatechange', 'closed');
-                                    break;
-                            }
-                        });
-                        iceTransport.addEventListener('candidatepairchange', (event) => {
-                            logger.debug('iceTransport "candidatepairchange" event [pair:%o]', event.pair);
-                        });
-                        this._iceTransport = iceTransport;
-                    }
-                    _setDtlsTransport() {
-                        const dtlsTransport = new RTCDtlsTransport(this._iceTransport);
-                        // NOTE: Not yet implemented by Edge.
-                        dtlsTransport.addEventListener('statechange', () => {
-                            logger.debug('dtlsTransport "statechange" event [state:%s]', dtlsTransport.state);
-                        });
-                        // NOTE: Not standard, but implemented by Edge.
-                        dtlsTransport.addEventListener('dtlsstatechange', () => {
-                            logger.debug('dtlsTransport "dtlsstatechange" event [state:%s]', dtlsTransport.state);
-                            if (dtlsTransport.state === 'closed') this.emit('@connectionstatechange', 'closed');
-                        });
-                        dtlsTransport.addEventListener('error', (event) => {
-                            logger.error('dtlsTransport "error" event [event:%o]', event);
-                        });
-                        this._dtlsTransport = dtlsTransport;
-                    }
-                    async _setupTransport({ localDtlsRole }) {
-                        logger.debug('_setupTransport()');
-                        // Get our local DTLS parameters.
-                        const dtlsParameters = this._dtlsTransport.getLocalParameters();
-                        dtlsParameters.role = localDtlsRole;
-                        // Need to tell the remote transport about our parameters.
-                        await this.safeEmitAsPromise('@connect', { dtlsParameters });
-                        // Start the RTCIceTransport.
-                        this._iceTransport.start(this._iceGatherer, this._remoteIceParameters, 'controlling');
-                        // Add remote ICE candidates.
-                        for (const candidate of this._remoteIceCandidates) {
-                            this._iceTransport.addRemoteCandidate(candidate);
-                        }
-                        // Also signal a 'complete' candidate as per spec.
-                        // NOTE: It should be {complete: true} but Edge prefers {}.
-                        // NOTE: If we don't signal end of candidates, the Edge RTCIceTransport
-                        // won't enter the 'completed' state.
-                        this._iceTransport.addRemoteCandidate({});
-                        // NOTE: Edge does not like SHA less than 256.
-                        this._remoteDtlsParameters.fingerprints = this._remoteDtlsParameters.fingerprints.filter(
-                            (fingerprint) => {
-                                return (
-                                    fingerprint.algorithm === 'sha-256' ||
-                                    fingerprint.algorithm === 'sha-384' ||
-                                    fingerprint.algorithm === 'sha-512'
-                                );
-                            },
-                        );
-                        // Start the RTCDtlsTransport.
-                        this._dtlsTransport.start(this._remoteDtlsParameters);
-                        this._transportReady = true;
-                    }
-                }
-                exports.Edge11 = Edge11;
-            },
-            {
-                '../Logger': 12,
-                '../errors': 15,
-                '../ortc': 33,
-                '../utils': 36,
-                './HandlerInterface': 22,
-                './ortc/edgeUtils': 26,
-            },
-        ],
-        21: [
-            function (require, module, exports) {
-                'use strict';
-                Object.defineProperty(exports, '__esModule', { value: true });
-                const sdpTransform = require('sdp-transform');
-                const Logger_1 = require('../Logger');
-                const errors_1 = require('../errors');
-                const utils = require('../utils');
-                const ortc = require('../ortc');
-                const sdpCommonUtils = require('./sdp/commonUtils');
-                const sdpUnifiedPlanUtils = require('./sdp/unifiedPlanUtils');
-                const HandlerInterface_1 = require('./HandlerInterface');
-                const RemoteSdp_1 = require('./sdp/RemoteSdp');
-                const logger = new Logger_1.Logger('Firefox60');
-                const SCTP_NUM_STREAMS = { OS: 16, MIS: 2048 };
-                class Firefox60 extends HandlerInterface_1.HandlerInterface {
-                    constructor() {
-                        super();
-                        // Map of RTCTransceivers indexed by MID.
-                        this._mapMidTransceiver = new Map();
-                        // Local stream for sending.
-                        this._sendStream = new MediaStream();
-                        // Whether a DataChannel m=application section has been created.
-                        this._hasDataChannelMediaSection = false;
-                        // Sending DataChannel id value counter. Incremented for each new DataChannel.
-                        this._nextSendSctpStreamId = 0;
-                        // Got transport local and remote parameters.
-                        this._transportReady = false;
-                    }
-                    /**
-                     * Creates a factory function.
-                     */
-                    static createFactory() {
-                        return () => new Firefox60();
-                    }
-                    get name() {
-                        return 'Firefox60';
-                    }
-                    close() {
-                        logger.debug('close()');
-                        // Close RTCPeerConnection.
-                        if (this._pc) {
-                            try {
-                                this._pc.close();
-                            } catch (error) {}
-                        }
-                    }
-                    async getNativeRtpCapabilities() {
-                        logger.debug('getNativeRtpCapabilities()');
-                        const pc = new RTCPeerConnection({
-                            iceServers: [],
-                            iceTransportPolicy: 'all',
-                            bundlePolicy: 'max-bundle',
-                            rtcpMuxPolicy: 'require',
-                        });
-                        // NOTE: We need to add a real video track to get the RID extension mapping.
-                        const canvas = document.createElement('canvas');
-                        // NOTE: Otherwise Firefox fails in next line.
-                        canvas.getContext('2d');
-                        const fakeStream = canvas.captureStream();
-                        const fakeVideoTrack = fakeStream.getVideoTracks()[0];
-                        try {
-                            pc.addTransceiver('audio', { direction: 'sendrecv' });
-                            const videoTransceiver = pc.addTransceiver(fakeVideoTrack, { direction: 'sendrecv' });
-                            const parameters = videoTransceiver.sender.getParameters();
-                            const encodings = [
-                                { rid: 'r0', maxBitrate: 100000 },
-                                { rid: 'r1', maxBitrate: 500000 },
-                            ];
-                            parameters.encodings = encodings;
-                            await videoTransceiver.sender.setParameters(parameters);
-                            const offer = await pc.createOffer();
-                            try {
-                                canvas.remove();
-                            } catch (error) {}
-                            try {
-                                fakeVideoTrack.stop();
-                            } catch (error) {}
-                            try {
-                                pc.close();
-                            } catch (error) {}
-                            const sdpObject = sdpTransform.parse(offer.sdp);
-                            const nativeRtpCapabilities = sdpCommonUtils.extractRtpCapabilities({ sdpObject });
-                            return nativeRtpCapabilities;
-                        } catch (error) {
-                            try {
-                                canvas.remove();
-                            } catch (error2) {}
-                            try {
-                                fakeVideoTrack.stop();
-                            } catch (error2) {}
-                            try {
-                                pc.close();
-                            } catch (error2) {}
-                            throw error;
-                        }
-                    }
-                    async getNativeSctpCapabilities() {
-                        logger.debug('getNativeSctpCapabilities()');
-                        return {
-                            numStreams: SCTP_NUM_STREAMS,
-                        };
-                    }
-                    run({
-                        direction,
-                        iceParameters,
-                        iceCandidates,
-                        dtlsParameters,
-                        sctpParameters,
-                        iceServers,
-                        iceTransportPolicy,
-                        additionalSettings,
-                        proprietaryConstraints,
-                        extendedRtpCapabilities,
-                    }) {
-                        logger.debug('run()');
-                        this._direction = direction;
-                        this._remoteSdp = new RemoteSdp_1.RemoteSdp({
-                            iceParameters,
-                            iceCandidates,
-                            dtlsParameters,
-                            sctpParameters,
-                        });
-                        this._sendingRtpParametersByKind = {
-                            audio: ortc.getSendingRtpParameters('audio', extendedRtpCapabilities),
-                            video: ortc.getSendingRtpParameters('video', extendedRtpCapabilities),
-                        };
-                        this._sendingRemoteRtpParametersByKind = {
-                            audio: ortc.getSendingRemoteRtpParameters('audio', extendedRtpCapabilities),
-                            video: ortc.getSendingRemoteRtpParameters('video', extendedRtpCapabilities),
-                        };
-                        this._pc = new RTCPeerConnection(
-                            {
-                                iceServers: iceServers || [],
-                                iceTransportPolicy: iceTransportPolicy || 'all',
-                                bundlePolicy: 'max-bundle',
-                                rtcpMuxPolicy: 'require',
-                                ...additionalSettings,
-                            },
-                            proprietaryConstraints,
-                        );
-                        // Handle RTCPeerConnection connection status.
-                        this._pc.addEventListener('iceconnectionstatechange', () => {
-                            switch (this._pc.iceConnectionState) {
-                                case 'checking':
-                                    this.emit('@connectionstatechange', 'connecting');
-                                    break;
-                                case 'connected':
-                                case 'completed':
-                                    this.emit('@connectionstatechange', 'connected');
-                                    break;
-                                case 'failed':
-                                    this.emit('@connectionstatechange', 'failed');
-                                    break;
-                                case 'disconnected':
-                                    this.emit('@connectionstatechange', 'disconnected');
-                                    break;
-                                case 'closed':
-                                    this.emit('@connectionstatechange', 'closed');
-                                    break;
-                            }
-                        });
-                    }
-                    // eslint-disable-next-line @typescript-eslint/no-unused-vars
-                    async updateIceServers(iceServers) {
-                        // NOTE: Firefox does not implement pc.setConfiguration().
-                        throw new errors_1.UnsupportedError('not supported');
-                    }
-                    async restartIce(iceParameters) {
-                        logger.debug('restartIce()');
-                        // Provide the remote SDP handler with new remote ICE parameters.
-                        this._remoteSdp.updateIceParameters(iceParameters);
-                        if (!this._transportReady) return;
-                        if (this._direction === 'send') {
-                            const offer = await this._pc.createOffer({ iceRestart: true });
-                            logger.debug('restartIce() | calling pc.setLocalDescription() [offer:%o]', offer);
-                            await this._pc.setLocalDescription(offer);
-                            const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
-                            logger.debug('restartIce() | calling pc.setRemoteDescription() [answer:%o]', answer);
-                            await this._pc.setRemoteDescription(answer);
-                        } else {
-                            const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
-                            logger.debug('restartIce() | calling pc.setRemoteDescription() [offer:%o]', offer);
-                            await this._pc.setRemoteDescription(offer);
-                            const answer = await this._pc.createAnswer();
-                            logger.debug('restartIce() | calling pc.setLocalDescription() [answer:%o]', answer);
-                            await this._pc.setLocalDescription(answer);
-                        }
-                    }
-                    async getTransportStats() {
-                        return this._pc.getStats();
-                    }
-                    async send({ track, encodings, codecOptions, codec }) {
-                        this._assertSendDirection();
-                        logger.debug('send() [kind:%s, track.id:%s]', track.kind, track.id);
-                        let reverseEncodings;
-                        if (encodings && encodings.length > 1) {
-                            encodings.forEach((encoding, idx) => {
-                                encoding.rid = `r${idx}`;
-                            });
-                            // Clone the encodings and reverse them because Firefox likes them
-                            // from high to low.
-                            reverseEncodings = utils.clone(encodings).reverse();
-                        }
-                        const sendingRtpParameters = utils.clone(this._sendingRtpParametersByKind[track.kind]);
-                        // This may throw.
-                        sendingRtpParameters.codecs = ortc.reduceCodecs(sendingRtpParameters.codecs, codec);
-                        const sendingRemoteRtpParameters = utils.clone(
-                            this._sendingRemoteRtpParametersByKind[track.kind],
-                        );
-                        // This may throw.
-                        sendingRemoteRtpParameters.codecs = ortc.reduceCodecs(sendingRemoteRtpParameters.codecs, codec);
-                        // NOTE: Firefox fails sometimes to properly anticipate the closed media
-                        // section that it should use, so don't reuse closed media sections.
-                        //   https://github.com/versatica/mediasoup-client/issues/104
-                        //
-                        // const mediaSectionIdx = this._remoteSdp!.getNextMediaSectionIdx();
-                        const transceiver = this._pc.addTransceiver(track, {
-                            direction: 'sendonly',
-                            streams: [this._sendStream],
-                        });
-                        // NOTE: This is not spec compliants. Encodings should be given in addTransceiver
-                        // second argument, but Firefox does not support it.
-                        if (reverseEncodings) {
-                            const parameters = transceiver.sender.getParameters();
-                            parameters.encodings = reverseEncodings;
-                            await transceiver.sender.setParameters(parameters);
-                        }
-                        const offer = await this._pc.createOffer();
-                        let localSdpObject = sdpTransform.parse(offer.sdp);
-                        // In Firefox use DTLS role client even if we are the "offerer" since
-                        // Firefox does not respect ICE-Lite.
-                        if (!this._transportReady)
-                            await this._setupTransport({ localDtlsRole: 'client', localSdpObject });
-                        logger.debug('send() | calling pc.setLocalDescription() [offer:%o]', offer);
-                        await this._pc.setLocalDescription(offer);
-                        // We can now get the transceiver.mid.
-                        const localId = transceiver.mid;
-                        // Set MID.
-                        sendingRtpParameters.mid = localId;
-                        localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
-                        const offerMediaObject = localSdpObject.media[localSdpObject.media.length - 1];
-                        // Set RTCP CNAME.
-                        sendingRtpParameters.rtcp.cname = sdpCommonUtils.getCname({ offerMediaObject });
-                        // Set RTP encodings by parsing the SDP offer if no encodings are given.
-                        if (!encodings) {
-                            sendingRtpParameters.encodings = sdpUnifiedPlanUtils.getRtpEncodings({ offerMediaObject });
-                        }
-                        // Set RTP encodings by parsing the SDP offer and complete them with given
-                        // one if just a single encoding has been given.
-                        else if (encodings.length === 1) {
-                            const newEncodings = sdpUnifiedPlanUtils.getRtpEncodings({ offerMediaObject });
-                            Object.assign(newEncodings[0], encodings[0]);
-                            sendingRtpParameters.encodings = newEncodings;
-                        }
-                        // Otherwise if more than 1 encoding are given use them verbatim.
-                        else {
-                            sendingRtpParameters.encodings = encodings;
-                        }
-                        // If VP8 or H264 and there is effective simulcast, add scalabilityMode to
-                        // each encoding.
-                        if (
-                            sendingRtpParameters.encodings.length > 1 &&
-                            (sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/vp8' ||
-                                sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/h264')
-                        ) {
-                            for (const encoding of sendingRtpParameters.encodings) {
-                                encoding.scalabilityMode = 'S1T3';
-                            }
-                        }
-                        this._remoteSdp.send({
-                            offerMediaObject,
-                            offerRtpParameters: sendingRtpParameters,
-                            answerRtpParameters: sendingRemoteRtpParameters,
-                            codecOptions,
-                            extmapAllowMixed: true,
-                        });
-                        const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
-                        logger.debug('send() | calling pc.setRemoteDescription() [answer:%o]', answer);
-                        await this._pc.setRemoteDescription(answer);
-                        // Store in the map.
-                        this._mapMidTransceiver.set(localId, transceiver);
-                        return {
-                            localId,
-                            rtpParameters: sendingRtpParameters,
-                            rtpSender: transceiver.sender,
-                        };
-                    }
-                    async stopSending(localId) {
-                        logger.debug('stopSending() [localId:%s]', localId);
-                        const transceiver = this._mapMidTransceiver.get(localId);
-                        if (!transceiver) throw new Error('associated transceiver not found');
-                        transceiver.sender.replaceTrack(null);
-                        this._pc.removeTrack(transceiver.sender);
-                        // NOTE: Cannot use closeMediaSection() due to the the note above in send()
-                        // method.
-                        // this._remoteSdp!.closeMediaSection(transceiver.mid);
-                        this._remoteSdp.disableMediaSection(transceiver.mid);
-                        const offer = await this._pc.createOffer();
-                        logger.debug('stopSending() | calling pc.setLocalDescription() [offer:%o]', offer);
-                        await this._pc.setLocalDescription(offer);
-                        const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
-                        logger.debug('stopSending() | calling pc.setRemoteDescription() [answer:%o]', answer);
-                        await this._pc.setRemoteDescription(answer);
-                    }
-                    async replaceTrack(localId, track) {
-                        this._assertSendDirection();
-                        if (track) {
-                            logger.debug('replaceTrack() [localId:%s, track.id:%s]', localId, track.id);
-                        } else {
-                            logger.debug('replaceTrack() [localId:%s, no track]', localId);
-                        }
-                        const transceiver = this._mapMidTransceiver.get(localId);
-                        if (!transceiver) throw new Error('associated RTCRtpTransceiver not found');
-                        await transceiver.sender.replaceTrack(track);
-                    }
-                    async setMaxSpatialLayer(localId, spatialLayer) {
-                        this._assertSendDirection();
-                        logger.debug('setMaxSpatialLayer() [localId:%s, spatialLayer:%s]', localId, spatialLayer);
-                        const transceiver = this._mapMidTransceiver.get(localId);
-                        if (!transceiver) throw new Error('associated transceiver not found');
-                        const parameters = transceiver.sender.getParameters();
-                        // NOTE: We require encodings given from low to high, however Firefox
-                        // requires them in reverse order, so do magic here.
-                        spatialLayer = parameters.encodings.length - 1 - spatialLayer;
-                        parameters.encodings.forEach((encoding, idx) => {
-                            if (idx >= spatialLayer) encoding.active = true;
-                            else encoding.active = false;
-                        });
-                        await transceiver.sender.setParameters(parameters);
-                    }
-                    async setRtpEncodingParameters(localId, params) {
-                        this._assertSendDirection();
-                        logger.debug('setRtpEncodingParameters() [localId:%s, params:%o]', localId, params);
-                        const transceiver = this._mapMidTransceiver.get(localId);
-                        if (!transceiver) throw new Error('associated RTCRtpTransceiver not found');
-                        const parameters = transceiver.sender.getParameters();
-                        parameters.encodings.forEach((encoding, idx) => {
-                            parameters.encodings[idx] = { ...encoding, ...params };
-                        });
-                        await transceiver.sender.setParameters(parameters);
-                    }
-                    async getSenderStats(localId) {
-                        this._assertSendDirection();
-                        const transceiver = this._mapMidTransceiver.get(localId);
-                        if (!transceiver) throw new Error('associated RTCRtpTransceiver not found');
-                        return transceiver.sender.getStats();
-                    }
-                    async sendDataChannel({ ordered, maxPacketLifeTime, maxRetransmits, label, protocol, priority }) {
-                        this._assertSendDirection();
-                        const options = {
-                            negotiated: true,
-                            id: this._nextSendSctpStreamId,
-                            ordered,
-                            maxPacketLifeTime,
-                            maxRetransmits,
-                            protocol,
-                            priority,
-                        };
-                        logger.debug('sendDataChannel() [options:%o]', options);
-                        const dataChannel = this._pc.createDataChannel(label, options);
-                        // Increase next id.
-                        this._nextSendSctpStreamId = ++this._nextSendSctpStreamId % SCTP_NUM_STREAMS.MIS;
-                        // If this is the first DataChannel we need to create the SDP answer with
-                        // m=application section.
-                        if (!this._hasDataChannelMediaSection) {
-                            const offer = await this._pc.createOffer();
-                            const localSdpObject = sdpTransform.parse(offer.sdp);
-                            const offerMediaObject = localSdpObject.media.find((m) => m.type === 'application');
-                            if (!this._transportReady)
-                                await this._setupTransport({ localDtlsRole: 'server', localSdpObject });
-                            logger.debug('sendDataChannel() | calling pc.setLocalDescription() [offer:%o]', offer);
-                            await this._pc.setLocalDescription(offer);
-                            this._remoteSdp.sendSctpAssociation({ offerMediaObject });
-                            const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
-                            logger.debug('sendDataChannel() | calling pc.setRemoteDescription() [answer:%o]', answer);
-                            await this._pc.setRemoteDescription(answer);
-                            this._hasDataChannelMediaSection = true;
-                        }
-                        const sctpStreamParameters = {
-                            streamId: options.id,
-                            ordered: options.ordered,
-                            maxPacketLifeTime: options.maxPacketLifeTime,
-                            maxRetransmits: options.maxRetransmits,
-                        };
-                        return { dataChannel, sctpStreamParameters };
-                    }
-                    async receive({ trackId, kind, rtpParameters }) {
-                        this._assertRecvDirection();
-                        logger.debug('receive() [trackId:%s, kind:%s]', trackId, kind);
-                        const localId = rtpParameters.mid || String(this._mapMidTransceiver.size);
-                        this._remoteSdp.receive({
-                            mid: localId,
-                            kind,
-                            offerRtpParameters: rtpParameters,
-                            streamId: rtpParameters.rtcp.cname,
-                            trackId,
-                        });
-                        const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
-                        logger.debug('receive() | calling pc.setRemoteDescription() [offer:%o]', offer);
-                        await this._pc.setRemoteDescription(offer);
-                        let answer = await this._pc.createAnswer();
-                        const localSdpObject = sdpTransform.parse(answer.sdp);
-                        const answerMediaObject = localSdpObject.media.find((m) => String(m.mid) === localId);
-                        // May need to modify codec parameters in the answer based on codec
-                        // parameters in the offer.
-                        sdpCommonUtils.applyCodecParameters({
-                            offerRtpParameters: rtpParameters,
-                            answerMediaObject,
-                        });
-                        answer = { type: 'answer', sdp: sdpTransform.write(localSdpObject) };
-                        if (!this._transportReady)
-                            await this._setupTransport({ localDtlsRole: 'client', localSdpObject });
-                        logger.debug('receive() | calling pc.setLocalDescription() [answer:%o]', answer);
-                        await this._pc.setLocalDescription(answer);
-                        const transceiver = this._pc.getTransceivers().find((t) => t.mid === localId);
-                        if (!transceiver) throw new Error('new RTCRtpTransceiver not found');
-                        // Store in the map.
-                        this._mapMidTransceiver.set(localId, transceiver);
-                        return {
-                            localId,
-                            track: transceiver.receiver.track,
-                            rtpReceiver: transceiver.receiver,
-                        };
-                    }
-                    async stopReceiving(localId) {
-                        this._assertRecvDirection();
-                        logger.debug('stopReceiving() [localId:%s]', localId);
-                        const transceiver = this._mapMidTransceiver.get(localId);
-                        if (!transceiver) throw new Error('associated RTCRtpTransceiver not found');
-                        this._remoteSdp.closeMediaSection(transceiver.mid);
-                        const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
-                        logger.debug('stopReceiving() | calling pc.setRemoteDescription() [offer:%o]', offer);
-                        await this._pc.setRemoteDescription(offer);
-                        const answer = await this._pc.createAnswer();
-                        logger.debug('stopReceiving() | calling pc.setLocalDescription() [answer:%o]', answer);
-                        await this._pc.setLocalDescription(answer);
-                    }
-                    async getReceiverStats(localId) {
-                        this._assertRecvDirection();
-                        const transceiver = this._mapMidTransceiver.get(localId);
-                        if (!transceiver) throw new Error('associated RTCRtpTransceiver not found');
-                        return transceiver.receiver.getStats();
-                    }
-                    async receiveDataChannel({ sctpStreamParameters, label, protocol }) {
-                        this._assertRecvDirection();
-                        const { streamId, ordered, maxPacketLifeTime, maxRetransmits } = sctpStreamParameters;
-                        const options = {
-                            negotiated: true,
-                            id: streamId,
-                            ordered,
-                            maxPacketLifeTime,
-                            maxRetransmits,
-                            protocol,
-                        };
-                        logger.debug('receiveDataChannel() [options:%o]', options);
-                        const dataChannel = this._pc.createDataChannel(label, options);
-                        // If this is the first DataChannel we need to create the SDP offer with
-                        // m=application section.
-                        if (!this._hasDataChannelMediaSection) {
-                            this._remoteSdp.receiveSctpAssociation();
-                            const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
-                            logger.debug('receiveDataChannel() | calling pc.setRemoteDescription() [offer:%o]', offer);
-                            await this._pc.setRemoteDescription(offer);
-                            const answer = await this._pc.createAnswer();
-                            if (!this._transportReady) {
-                                const localSdpObject = sdpTransform.parse(answer.sdp);
-                                await this._setupTransport({ localDtlsRole: 'client', localSdpObject });
-                            }
-                            logger.debug(
-                                'receiveDataChannel() | calling pc.setRemoteDescription() [answer:%o]',
-                                answer,
-                            );
-                            await this._pc.setLocalDescription(answer);
-                            this._hasDataChannelMediaSection = true;
-                        }
-                        return { dataChannel };
-                    }
-                    async _setupTransport({ localDtlsRole, localSdpObject }) {
-                        if (!localSdpObject) localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
-                        // Get our local DTLS parameters.
-                        const dtlsParameters = sdpCommonUtils.extractDtlsParameters({ sdpObject: localSdpObject });
-                        // Set our DTLS role.
-                        dtlsParameters.role = localDtlsRole;
-                        // Update the remote DTLS role in the SDP.
-                        this._remoteSdp.updateDtlsRole(localDtlsRole === 'client' ? 'server' : 'client');
-                        // Need to tell the remote transport about our parameters.
-                        await this.safeEmitAsPromise('@connect', { dtlsParameters });
-                        this._transportReady = true;
-                    }
-                    _assertSendDirection() {
-                        if (this._direction !== 'send') {
-                            throw new Error('method can just be called for handlers with "send" direction');
-                        }
-                    }
-                    _assertRecvDirection() {
-                        if (this._direction !== 'recv') {
-                            throw new Error('method can just be called for handlers with "recv" direction');
-                        }
-                    }
-                }
-                exports.Firefox60 = Firefox60;
-            },
+                audio: ortc.getSendingRemoteRtpParameters('audio', extendedRtpCapabilities),
+                video: ortc.getSendingRemoteRtpParameters('video', extendedRtpCapabilities)
+            };
+        this._pc = new RTCPeerConnection(Object.assign({ iceServers: iceServers || [], iceTransportPolicy: iceTransportPolicy || 'all', bundlePolicy: 'max-bundle', rtcpMuxPolicy: 'require', sdpSemantics: 'plan-b' }, additionalSettings), proprietaryConstraints);
+        // Handle RTCPeerConnection connection status.
+        this._pc.addEventListener('iceconnectionstatechange', () => {
+            switch (this._pc.iceConnectionState) {
+                case 'checking':
+                    this.emit('@connectionstatechange', 'connecting');
+                    break;
+                case 'connected':
+                case 'completed':
+                    this.emit('@connectionstatechange', 'connected');
+                    break;
+                case 'failed':
+                    this.emit('@connectionstatechange', 'failed');
+                    break;
+                case 'disconnected':
+                    this.emit('@connectionstatechange', 'disconnected');
+                    break;
+                case 'closed':
+                    this.emit('@connectionstatechange', 'closed');
+                    break;
+            }
+        });
+    }
+    async updateIceServers(iceServers) {
+        logger.debug('updateIceServers()');
+        const configuration = this._pc.getConfiguration();
+        configuration.iceServers = iceServers;
+        this._pc.setConfiguration(configuration);
+    }
+    async restartIce(iceParameters) {
+        logger.debug('restartIce()');
+        // Provide the remote SDP handler with new remote ICE parameters.
+        this._remoteSdp.updateIceParameters(iceParameters);
+        if (!this._transportReady)
+            return;
+        if (this._direction === 'send') {
+            const offer = await this._pc.createOffer({ iceRestart: true });
+            logger.debug('restartIce() | calling pc.setLocalDescription() [offer:%o]', offer);
+            await this._pc.setLocalDescription(offer);
+            const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
+            logger.debug('restartIce() | calling pc.setRemoteDescription() [answer:%o]', answer);
+            await this._pc.setRemoteDescription(answer);
+        }
+        else {
+            const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
+            logger.debug('restartIce() | calling pc.setRemoteDescription() [offer:%o]', offer);
+            await this._pc.setRemoteDescription(offer);
+            const answer = await this._pc.createAnswer();
+            logger.debug('restartIce() | calling pc.setLocalDescription() [answer:%o]', answer);
+            await this._pc.setLocalDescription(answer);
+        }
+    }
+    async getTransportStats() {
+        return this._pc.getStats();
+    }
+    async send({ track, encodings, codecOptions, codec }) {
+        this._assertSendDirection();
+        logger.debug('send() [kind:%s, track.id:%s]', track.kind, track.id);
+        if (codec) {
+            logger.warn('send() | codec selection is not available in %s handler', this.name);
+        }
+        this._sendStream.addTrack(track);
+        this._pc.addTrack(track, this._sendStream);
+        let offer = await this._pc.createOffer();
+        let localSdpObject = sdpTransform.parse(offer.sdp);
+        let offerMediaObject;
+        const sendingRtpParameters = utils.clone(this._sendingRtpParametersByKind[track.kind], {});
+        sendingRtpParameters.codecs =
+            ortc.reduceCodecs(sendingRtpParameters.codecs);
+        const sendingRemoteRtpParameters = utils.clone(this._sendingRemoteRtpParametersByKind[track.kind], {});
+        sendingRemoteRtpParameters.codecs =
+            ortc.reduceCodecs(sendingRemoteRtpParameters.codecs);
+        if (!this._transportReady)
+            await this._setupTransport({ localDtlsRole: 'server', localSdpObject });
+        if (track.kind === 'video' && encodings && encodings.length > 1) {
+            logger.debug('send() | enabling simulcast');
+            localSdpObject = sdpTransform.parse(offer.sdp);
+            offerMediaObject = localSdpObject.media
+                .find((m) => m.type === 'video');
+            sdpPlanBUtils.addLegacySimulcast({
+                offerMediaObject,
+                track,
+                numStreams: encodings.length
+            });
+            offer = { type: 'offer', sdp: sdpTransform.write(localSdpObject) };
+        }
+        logger.debug('send() | calling pc.setLocalDescription() [offer:%o]', offer);
+        await this._pc.setLocalDescription(offer);
+        localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
+        offerMediaObject = localSdpObject.media
+            .find((m) => m.type === track.kind);
+        // Set RTCP CNAME.
+        sendingRtpParameters.rtcp.cname =
+            sdpCommonUtils.getCname({ offerMediaObject });
+        // Set RTP encodings.
+        sendingRtpParameters.encodings =
+            sdpPlanBUtils.getRtpEncodings({ offerMediaObject, track });
+        // Complete encodings with given values.
+        if (encodings) {
+            for (let idx = 0; idx < sendingRtpParameters.encodings.length; ++idx) {
+                if (encodings[idx])
+                    Object.assign(sendingRtpParameters.encodings[idx], encodings[idx]);
+            }
+        }
+        // If VP8 and there is effective simulcast, add scalabilityMode to each
+        // encoding.
+        if (sendingRtpParameters.encodings.length > 1 &&
+            sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/vp8') {
+            for (const encoding of sendingRtpParameters.encodings) {
+                encoding.scalabilityMode = 'S1T3';
+            }
+        }
+        this._remoteSdp.send({
+            offerMediaObject,
+            offerRtpParameters: sendingRtpParameters,
+            answerRtpParameters: sendingRemoteRtpParameters,
+            codecOptions
+        });
+        const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
+        logger.debug('send() | calling pc.setRemoteDescription() [answer:%o]', answer);
+        await this._pc.setRemoteDescription(answer);
+        const localId = String(this._nextSendLocalId);
+        this._nextSendLocalId++;
+        const rtpSender = this._pc.getSenders()
+            .find((s) => s.track === track);
+        // Insert into the map.
+        this._mapSendLocalIdRtpSender.set(localId, rtpSender);
+        return {
+            localId: localId,
+            rtpParameters: sendingRtpParameters,
+            rtpSender
+        };
+    }
+    async stopSending(localId) {
+        this._assertSendDirection();
+        logger.debug('stopSending() [localId:%s]', localId);
+        const rtpSender = this._mapSendLocalIdRtpSender.get(localId);
+        if (!rtpSender)
+            throw new Error('associated RTCRtpSender not found');
+        this._pc.removeTrack(rtpSender);
+        if (rtpSender.track)
+            this._sendStream.removeTrack(rtpSender.track);
+        this._mapSendLocalIdRtpSender.delete(localId);
+        const offer = await this._pc.createOffer();
+        logger.debug('stopSending() | calling pc.setLocalDescription() [offer:%o]', offer);
+        try {
+            await this._pc.setLocalDescription(offer);
+        }
+        catch (error) {
+            // NOTE: If there are no sending tracks, setLocalDescription() will fail with
+            // "Failed to create channels". If so, ignore it.
+            if (this._sendStream.getTracks().length === 0) {
+                logger.warn('stopSending() | ignoring expected error due no sending tracks: %s', error.toString());
+                return;
+            }
+            throw error;
+        }
+        if (this._pc.signalingState === 'stable')
+            return;
+        const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
+        logger.debug('stopSending() | calling pc.setRemoteDescription() [answer:%o]', answer);
+        await this._pc.setRemoteDescription(answer);
+    }
+    async replaceTrack(localId, track) {
+        this._assertSendDirection();
+        if (track) {
+            logger.debug('replaceTrack() [localId:%s, track.id:%s]', localId, track.id);
+        }
+        else {
+            logger.debug('replaceTrack() [localId:%s, no track]', localId);
+        }
+        const rtpSender = this._mapSendLocalIdRtpSender.get(localId);
+        if (!rtpSender)
+            throw new Error('associated RTCRtpSender not found');
+        const oldTrack = rtpSender.track;
+        await rtpSender.replaceTrack(track);
+        // Remove the old track from the local stream.
+        if (oldTrack)
+            this._sendStream.removeTrack(oldTrack);
+        // Add the new track to the local stream.
+        if (track)
+            this._sendStream.addTrack(track);
+    }
+    async setMaxSpatialLayer(localId, spatialLayer) {
+        this._assertSendDirection();
+        logger.debug('setMaxSpatialLayer() [localId:%s, spatialLayer:%s]', localId, spatialLayer);
+        const rtpSender = this._mapSendLocalIdRtpSender.get(localId);
+        if (!rtpSender)
+            throw new Error('associated RTCRtpSender not found');
+        const parameters = rtpSender.getParameters();
+        parameters.encodings.forEach((encoding, idx) => {
+            if (idx <= spatialLayer)
+                encoding.active = true;
+            else
+                encoding.active = false;
+        });
+        await rtpSender.setParameters(parameters);
+    }
+    async setRtpEncodingParameters(localId, params) {
+        this._assertSendDirection();
+        logger.debug('setRtpEncodingParameters() [localId:%s, params:%o]', localId, params);
+        const rtpSender = this._mapSendLocalIdRtpSender.get(localId);
+        if (!rtpSender)
+            throw new Error('associated RTCRtpSender not found');
+        const parameters = rtpSender.getParameters();
+        parameters.encodings.forEach((encoding, idx) => {
+            parameters.encodings[idx] = Object.assign(Object.assign({}, encoding), params);
+        });
+        await rtpSender.setParameters(parameters);
+    }
+    async getSenderStats(localId) {
+        this._assertSendDirection();
+        const rtpSender = this._mapSendLocalIdRtpSender.get(localId);
+        if (!rtpSender)
+            throw new Error('associated RTCRtpSender not found');
+        return rtpSender.getStats();
+    }
+    async sendDataChannel({ ordered, maxPacketLifeTime, maxRetransmits, label, protocol }) {
+        this._assertSendDirection();
+        const options = {
+            negotiated: true,
+            id: this._nextSendSctpStreamId,
+            ordered,
+            maxPacketLifeTime,
+            maxRetransmitTime: maxPacketLifeTime,
+            maxRetransmits,
+            protocol
+        };
+        logger.debug('sendDataChannel() [options:%o]', options);
+        const dataChannel = this._pc.createDataChannel(label, options);
+        // Increase next id.
+        this._nextSendSctpStreamId =
+            ++this._nextSendSctpStreamId % SCTP_NUM_STREAMS.MIS;
+        // If this is the first DataChannel we need to create the SDP answer with
+        // m=application section.
+        if (!this._hasDataChannelMediaSection) {
+            const offer = await this._pc.createOffer();
+            const localSdpObject = sdpTransform.parse(offer.sdp);
+            const offerMediaObject = localSdpObject.media
+                .find((m) => m.type === 'application');
+            if (!this._transportReady)
+                await this._setupTransport({ localDtlsRole: 'server', localSdpObject });
+            logger.debug('sendDataChannel() | calling pc.setLocalDescription() [offer:%o]', offer);
+            await this._pc.setLocalDescription(offer);
+            this._remoteSdp.sendSctpAssociation({ offerMediaObject });
+            const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
+            logger.debug('sendDataChannel() | calling pc.setRemoteDescription() [answer:%o]', answer);
+            await this._pc.setRemoteDescription(answer);
+            this._hasDataChannelMediaSection = true;
+        }
+        const sctpStreamParameters = {
+            streamId: options.id,
+            ordered: options.ordered,
+            maxPacketLifeTime: options.maxPacketLifeTime,
+            maxRetransmits: options.maxRetransmits
+        };
+        return { dataChannel, sctpStreamParameters };
+    }
+    async receive({ trackId, kind, rtpParameters }) {
+        this._assertRecvDirection();
+        logger.debug('receive() [trackId:%s, kind:%s]', trackId, kind);
+        const localId = trackId;
+        const mid = kind;
+        this._remoteSdp.receive({
+            mid,
+            kind,
+            offerRtpParameters: rtpParameters,
+            streamId: rtpParameters.rtcp.cname,
+            trackId
+        });
+        const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
+        logger.debug('receive() | calling pc.setRemoteDescription() [offer:%o]', offer);
+        await this._pc.setRemoteDescription(offer);
+        let answer = await this._pc.createAnswer();
+        const localSdpObject = sdpTransform.parse(answer.sdp);
+        const answerMediaObject = localSdpObject.media
+            .find((m) => String(m.mid) === mid);
+        // May need to modify codec parameters in the answer based on codec
+        // parameters in the offer.
+        sdpCommonUtils.applyCodecParameters({
+            offerRtpParameters: rtpParameters,
+            answerMediaObject
+        });
+        answer = { type: 'answer', sdp: sdpTransform.write(localSdpObject) };
+        if (!this._transportReady)
+            await this._setupTransport({ localDtlsRole: 'client', localSdpObject });
+        logger.debug('receive() | calling pc.setLocalDescription() [answer:%o]', answer);
+        await this._pc.setLocalDescription(answer);
+        const rtpReceiver = this._pc.getReceivers()
+            .find((r) => r.track && r.track.id === localId);
+        if (!rtpReceiver)
+            throw new Error('new RTCRtpReceiver not');
+        // Insert into the map.
+        this._mapRecvLocalIdInfo.set(localId, { mid, rtpParameters, rtpReceiver });
+        return {
+            localId,
+            track: rtpReceiver.track,
+            rtpReceiver
+        };
+    }
+    async stopReceiving(localId) {
+        this._assertRecvDirection();
+        logger.debug('stopReceiving() [localId:%s]', localId);
+        const { mid, rtpParameters } = this._mapRecvLocalIdInfo.get(localId) || {};
+        // Remove from the map.
+        this._mapRecvLocalIdInfo.delete(localId);
+        this._remoteSdp.planBStopReceiving({ mid: mid, offerRtpParameters: rtpParameters });
+        const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
+        logger.debug('stopReceiving() | calling pc.setRemoteDescription() [offer:%o]', offer);
+        await this._pc.setRemoteDescription(offer);
+        const answer = await this._pc.createAnswer();
+        logger.debug('stopReceiving() | calling pc.setLocalDescription() [answer:%o]', answer);
+        await this._pc.setLocalDescription(answer);
+    }
+    async getReceiverStats(localId) {
+        this._assertRecvDirection();
+        const { rtpReceiver } = this._mapRecvLocalIdInfo.get(localId) || {};
+        if (!rtpReceiver)
+            throw new Error('associated RTCRtpReceiver not found');
+        return rtpReceiver.getStats();
+    }
+    async receiveDataChannel({ sctpStreamParameters, label, protocol }) {
+        this._assertRecvDirection();
+        const { streamId, ordered, maxPacketLifeTime, maxRetransmits } = sctpStreamParameters;
+        const options = {
+            negotiated: true,
+            id: streamId,
+            ordered,
+            maxPacketLifeTime,
+            maxRetransmitTime: maxPacketLifeTime,
+            maxRetransmits,
+            protocol
+        };
+        logger.debug('receiveDataChannel() [options:%o]', options);
+        const dataChannel = this._pc.createDataChannel(label, options);
+        // If this is the first DataChannel we need to create the SDP offer with
+        // m=application section.
+        if (!this._hasDataChannelMediaSection) {
+            this._remoteSdp.receiveSctpAssociation({ oldDataChannelSpec: true });
+            const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
+            logger.debug('receiveDataChannel() | calling pc.setRemoteDescription() [offer:%o]', offer);
+            await this._pc.setRemoteDescription(offer);
+            const answer = await this._pc.createAnswer();
+            if (!this._transportReady) {
+                const localSdpObject = sdpTransform.parse(answer.sdp);
+                await this._setupTransport({ localDtlsRole: 'client', localSdpObject });
+            }
+            logger.debug('receiveDataChannel() | calling pc.setRemoteDescription() [answer:%o]', answer);
+            await this._pc.setLocalDescription(answer);
+            this._hasDataChannelMediaSection = true;
+        }
+        return { dataChannel };
+    }
+    async _setupTransport({ localDtlsRole, localSdpObject }) {
+        if (!localSdpObject)
+            localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
+        // Get our local DTLS parameters.
+        const dtlsParameters = sdpCommonUtils.extractDtlsParameters({ sdpObject: localSdpObject });
+        // Set our DTLS role.
+        dtlsParameters.role = localDtlsRole;
+        // Update the remote DTLS role in the SDP.
+        this._remoteSdp.updateDtlsRole(localDtlsRole === 'client' ? 'server' : 'client');
+        // Need to tell the remote transport about our parameters.
+        await this.safeEmitAsPromise('@connect', { dtlsParameters });
+        this._transportReady = true;
+    }
+    _assertSendDirection() {
+        if (this._direction !== 'send') {
+            throw new Error('method can just be called for handlers with "send" direction');
+        }
+    }
+    _assertRecvDirection() {
+        if (this._direction !== 'recv') {
+            throw new Error('method can just be called for handlers with "recv" direction');
+        }
+    }
+}
+exports.Chrome67 = Chrome67;
+
+},{"../Logger":13,"../ortc":36,"../utils":39,"./HandlerInterface":25,"./sdp/RemoteSdp":31,"./sdp/commonUtils":32,"./sdp/planBUtils":33,"sdp-transform":44}],21:[function(require,module,exports){
+"use strict";
+var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
+}) : (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    o[k2] = m[k];
+}));
+var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
+    Object.defineProperty(o, "default", { enumerable: true, value: v });
+}) : function(o, v) {
+    o["default"] = v;
+});
+var __importStar = (this && this.__importStar) || function (mod) {
+    if (mod && mod.__esModule) return mod;
+    var result = {};
+    if (mod != null) for (var k in mod) if (k !== "default" && Object.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
+    __setModuleDefault(result, mod);
+    return result;
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.Chrome70 = void 0;
+const sdpTransform = __importStar(require("sdp-transform"));
+const Logger_1 = require("../Logger");
+const utils = __importStar(require("../utils"));
+const ortc = __importStar(require("../ortc"));
+const sdpCommonUtils = __importStar(require("./sdp/commonUtils"));
+const sdpUnifiedPlanUtils = __importStar(require("./sdp/unifiedPlanUtils"));
+const HandlerInterface_1 = require("./HandlerInterface");
+const RemoteSdp_1 = require("./sdp/RemoteSdp");
+const scalabilityModes_1 = require("../scalabilityModes");
+const logger = new Logger_1.Logger('Chrome70');
+const SCTP_NUM_STREAMS = { OS: 1024, MIS: 1024 };
+class Chrome70 extends HandlerInterface_1.HandlerInterface {
+    constructor() {
+        super();
+        // Map of RTCTransceivers indexed by MID.
+        this._mapMidTransceiver = new Map();
+        // Local stream for sending.
+        this._sendStream = new MediaStream();
+        // Whether a DataChannel m=application section has been created.
+        this._hasDataChannelMediaSection = false;
+        // Sending DataChannel id value counter. Incremented for each new DataChannel.
+        this._nextSendSctpStreamId = 0;
+        // Got transport local and remote parameters.
+        this._transportReady = false;
+    }
+    /**
+     * Creates a factory function.
+     */
+    static createFactory() {
+        return () => new Chrome70();
+    }
+    get name() {
+        return 'Chrome70';
+    }
+    close() {
+        logger.debug('close()');
+        // Close RTCPeerConnection.
+        if (this._pc) {
+            try {
+                this._pc.close();
+            }
+            catch (error) { }
+        }
+    }
+    async getNativeRtpCapabilities() {
+        logger.debug('getNativeRtpCapabilities()');
+        const pc = new RTCPeerConnection({
+            iceServers: [],
+            iceTransportPolicy: 'all',
+            bundlePolicy: 'max-bundle',
+            rtcpMuxPolicy: 'require',
+            sdpSemantics: 'unified-plan'
+        });
+        try {
+            pc.addTransceiver('audio');
+            pc.addTransceiver('video');
+            const offer = await pc.createOffer();
+            try {
+                pc.close();
+            }
+            catch (error) { }
+            const sdpObject = sdpTransform.parse(offer.sdp);
+            const nativeRtpCapabilities = sdpCommonUtils.extractRtpCapabilities({ sdpObject });
+            return nativeRtpCapabilities;
+        }
+        catch (error) {
+            try {
+                pc.close();
+            }
+            catch (error2) { }
+            throw error;
+        }
+    }
+    async getNativeSctpCapabilities() {
+        logger.debug('getNativeSctpCapabilities()');
+        return {
+            numStreams: SCTP_NUM_STREAMS
+        };
+    }
+    run({ direction, iceParameters, iceCandidates, dtlsParameters, sctpParameters, iceServers, iceTransportPolicy, additionalSettings, proprietaryConstraints, extendedRtpCapabilities }) {
+        logger.debug('run()');
+        this._direction = direction;
+        this._remoteSdp = new RemoteSdp_1.RemoteSdp({
+            iceParameters,
+            iceCandidates,
+            dtlsParameters,
+            sctpParameters
+        });
+        this._sendingRtpParametersByKind =
             {
-                '../Logger': 12,
-                '../errors': 15,
-                '../ortc': 33,
-                '../utils': 36,
-                './HandlerInterface': 22,
-                './sdp/RemoteSdp': 28,
-                './sdp/commonUtils': 29,
-                './sdp/unifiedPlanUtils': 31,
-                'sdp-transform': 41,
-            },
-        ],
-        22: [
-            function (require, module, exports) {
-                'use strict';
-                Object.defineProperty(exports, '__esModule', { value: true });
-                const EnhancedEventEmitter_1 = require('../EnhancedEventEmitter');
-                class HandlerInterface extends EnhancedEventEmitter_1.EnhancedEventEmitter {
-                    /**
-                     * @emits @connect - (
-                     *     { dtlsParameters: DtlsParameters },
-                     *     callback: Function,
-                     *     errback: Function
-                     *   )
-                     * @emits @connectionstatechange - (connectionState: ConnectionState)
-                     */
-                    constructor() {
-                        super();
-                    }
-                }
-                exports.HandlerInterface = HandlerInterface;
-            },
-            { '../EnhancedEventEmitter': 11 },
-        ],
-        23: [
-            function (require, module, exports) {
-                'use strict';
-                Object.defineProperty(exports, '__esModule', { value: true });
-                const sdpTransform = require('sdp-transform');
-                const Logger_1 = require('../Logger');
-                const errors_1 = require('../errors');
-                const utils = require('../utils');
-                const ortc = require('../ortc');
-                const sdpCommonUtils = require('./sdp/commonUtils');
-                const sdpPlanBUtils = require('./sdp/planBUtils');
-                const HandlerInterface_1 = require('./HandlerInterface');
-                const RemoteSdp_1 = require('./sdp/RemoteSdp');
-                const logger = new Logger_1.Logger('ReactNative');
-                const SCTP_NUM_STREAMS = { OS: 1024, MIS: 1024 };
-                class ReactNative extends HandlerInterface_1.HandlerInterface {
-                    constructor() {
-                        super();
-                        // Local stream for sending.
-                        this._sendStream = new MediaStream();
-                        // Map of sending MediaStreamTracks indexed by localId.
-                        this._mapSendLocalIdTrack = new Map();
-                        // Next sending localId.
-                        this._nextSendLocalId = 0;
-                        // Map of MID, RTP parameters and RTCRtpReceiver indexed by local id.
-                        // Value is an Object with mid, rtpParameters and rtpReceiver.
-                        this._mapRecvLocalIdInfo = new Map();
-                        // Whether a DataChannel m=application section has been created.
-                        this._hasDataChannelMediaSection = false;
-                        // Sending DataChannel id value counter. Incremented for each new DataChannel.
-                        this._nextSendSctpStreamId = 0;
-                        // Got transport local and remote parameters.
-                        this._transportReady = false;
-                    }
-                    /**
-                     * Creates a factory function.
-                     */
-                    static createFactory() {
-                        return () => new ReactNative();
-                    }
-                    get name() {
-                        return 'ReactNative';
-                    }
-                    close() {
-                        logger.debug('close()');
-                        // Close RTCPeerConnection.
-                        if (this._pc) {
-                            try {
-                                this._pc.close();
-                            } catch (error) {}
-                        }
-                    }
-                    async getNativeRtpCapabilities() {
-                        logger.debug('getNativeRtpCapabilities()');
-                        const pc = new RTCPeerConnection({
-                            iceServers: [],
-                            iceTransportPolicy: 'all',
-                            bundlePolicy: 'max-bundle',
-                            rtcpMuxPolicy: 'require',
-                            sdpSemantics: 'plan-b',
-                        });
-                        try {
-                            const offer = await pc.createOffer({
-                                offerToReceiveAudio: true,
-                                offerToReceiveVideo: true,
-                            });
-                            try {
-                                pc.close();
-                            } catch (error) {}
-                            const sdpObject = sdpTransform.parse(offer.sdp);
-                            const nativeRtpCapabilities = sdpCommonUtils.extractRtpCapabilities({ sdpObject });
-                            return nativeRtpCapabilities;
-                        } catch (error) {
-                            try {
-                                pc.close();
-                            } catch (error2) {}
-                            throw error;
-                        }
-                    }
-                    async getNativeSctpCapabilities() {
-                        logger.debug('getNativeSctpCapabilities()');
-                        return {
-                            numStreams: SCTP_NUM_STREAMS,
-                        };
-                    }
-                    run({
-                        direction,
-                        iceParameters,
-                        iceCandidates,
-                        dtlsParameters,
-                        sctpParameters,
-                        iceServers,
-                        iceTransportPolicy,
-                        additionalSettings,
-                        proprietaryConstraints,
-                        extendedRtpCapabilities,
-                    }) {
-                        logger.debug('run()');
-                        this._direction = direction;
-                        this._remoteSdp = new RemoteSdp_1.RemoteSdp({
-                            iceParameters,
-                            iceCandidates,
-                            dtlsParameters,
-                            sctpParameters,
-                            planB: true,
-                        });
-                        this._sendingRtpParametersByKind = {
-                            audio: ortc.getSendingRtpParameters('audio', extendedRtpCapabilities),
-                            video: ortc.getSendingRtpParameters('video', extendedRtpCapabilities),
-                        };
-                        this._sendingRemoteRtpParametersByKind = {
-                            audio: ortc.getSendingRemoteRtpParameters('audio', extendedRtpCapabilities),
-                            video: ortc.getSendingRemoteRtpParameters('video', extendedRtpCapabilities),
-                        };
-                        this._pc = new RTCPeerConnection(
-                            {
-                                iceServers: iceServers || [],
-                                iceTransportPolicy: iceTransportPolicy || 'all',
-                                bundlePolicy: 'max-bundle',
-                                rtcpMuxPolicy: 'require',
-                                sdpSemantics: 'plan-b',
-                                ...additionalSettings,
-                            },
-                            proprietaryConstraints,
-                        );
-                        // Handle RTCPeerConnection connection status.
-                        this._pc.addEventListener('iceconnectionstatechange', () => {
-                            switch (this._pc.iceConnectionState) {
-                                case 'checking':
-                                    this.emit('@connectionstatechange', 'connecting');
-                                    break;
-                                case 'connected':
-                                case 'completed':
-                                    this.emit('@connectionstatechange', 'connected');
-                                    break;
-                                case 'failed':
-                                    this.emit('@connectionstatechange', 'failed');
-                                    break;
-                                case 'disconnected':
-                                    this.emit('@connectionstatechange', 'disconnected');
-                                    break;
-                                case 'closed':
-                                    this.emit('@connectionstatechange', 'closed');
-                                    break;
-                            }
-                        });
-                    }
-                    async updateIceServers(iceServers) {
-                        logger.debug('updateIceServers()');
-                        const configuration = this._pc.getConfiguration();
-                        configuration.iceServers = iceServers;
-                        this._pc.setConfiguration(configuration);
-                    }
-                    async restartIce(iceParameters) {
-                        logger.debug('restartIce()');
-                        // Provide the remote SDP handler with new remote ICE parameters.
-                        this._remoteSdp.updateIceParameters(iceParameters);
-                        if (!this._transportReady) return;
-                        if (this._direction === 'send') {
-                            const offer = await this._pc.createOffer({ iceRestart: true });
-                            logger.debug('restartIce() | calling pc.setLocalDescription() [offer:%o]', offer);
-                            await this._pc.setLocalDescription(offer);
-                            const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
-                            logger.debug('restartIce() | calling pc.setRemoteDescription() [answer:%o]', answer);
-                            await this._pc.setRemoteDescription(answer);
-                        } else {
-                            const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
-                            logger.debug('restartIce() | calling pc.setRemoteDescription() [offer:%o]', offer);
-                            await this._pc.setRemoteDescription(offer);
-                            const answer = await this._pc.createAnswer();
-                            logger.debug('restartIce() | calling pc.setLocalDescription() [answer:%o]', answer);
-                            await this._pc.setLocalDescription(answer);
-                        }
-                    }
-                    async getTransportStats() {
-                        return this._pc.getStats();
-                    }
-                    async send({ track, encodings, codecOptions, codec }) {
-                        this._assertSendDirection();
-                        logger.debug('send() [kind:%s, track.id:%s]', track.kind, track.id);
-                        if (codec) {
-                            logger.warn('send() | codec selection is not available in %s handler', this.name);
-                        }
-                        this._sendStream.addTrack(track);
-                        this._pc.addStream(this._sendStream);
-                        let offer = await this._pc.createOffer();
-                        let localSdpObject = sdpTransform.parse(offer.sdp);
-                        let offerMediaObject;
-                        const sendingRtpParameters = utils.clone(this._sendingRtpParametersByKind[track.kind]);
-                        sendingRtpParameters.codecs = ortc.reduceCodecs(sendingRtpParameters.codecs);
-                        const sendingRemoteRtpParameters = utils.clone(
-                            this._sendingRemoteRtpParametersByKind[track.kind],
-                        );
-                        sendingRemoteRtpParameters.codecs = ortc.reduceCodecs(sendingRemoteRtpParameters.codecs);
-                        if (!this._transportReady)
-                            await this._setupTransport({ localDtlsRole: 'server', localSdpObject });
-                        if (track.kind === 'video' && encodings && encodings.length > 1) {
-                            logger.debug('send() | enabling simulcast');
-                            localSdpObject = sdpTransform.parse(offer.sdp);
-                            offerMediaObject = localSdpObject.media.find((m) => m.type === 'video');
-                            sdpPlanBUtils.addLegacySimulcast({
-                                offerMediaObject,
-                                track,
-                                numStreams: encodings.length,
-                            });
-                            offer = { type: 'offer', sdp: sdpTransform.write(localSdpObject) };
-                        }
-                        logger.debug('send() | calling pc.setLocalDescription() [offer:%o]', offer);
-                        await this._pc.setLocalDescription(offer);
-                        localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
-                        offerMediaObject = localSdpObject.media.find((m) => m.type === track.kind);
-                        // Set RTCP CNAME.
-                        sendingRtpParameters.rtcp.cname = sdpCommonUtils.getCname({ offerMediaObject });
-                        // Set RTP encodings.
-                        sendingRtpParameters.encodings = sdpPlanBUtils.getRtpEncodings({ offerMediaObject, track });
-                        // Complete encodings with given values.
-                        if (encodings) {
-                            for (let idx = 0; idx < sendingRtpParameters.encodings.length; ++idx) {
-                                if (encodings[idx]) Object.assign(sendingRtpParameters.encodings[idx], encodings[idx]);
-                            }
-                        }
-                        // If VP8 or H264 and there is effective simulcast, add scalabilityMode to
-                        // each encoding.
-                        if (
-                            sendingRtpParameters.encodings.length > 1 &&
-                            (sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/vp8' ||
-                                sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/h264')
-                        ) {
-                            for (const encoding of sendingRtpParameters.encodings) {
-                                encoding.scalabilityMode = 'S1T3';
-                            }
-                        }
-                        this._remoteSdp.send({
-                            offerMediaObject,
-                            offerRtpParameters: sendingRtpParameters,
-                            answerRtpParameters: sendingRemoteRtpParameters,
-                            codecOptions,
-                        });
-                        const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
-                        logger.debug('send() | calling pc.setRemoteDescription() [answer:%o]', answer);
-                        await this._pc.setRemoteDescription(answer);
-                        const localId = String(this._nextSendLocalId);
-                        this._nextSendLocalId++;
-                        // Insert into the map.
-                        this._mapSendLocalIdTrack.set(localId, track);
-                        return {
-                            localId: localId,
-                            rtpParameters: sendingRtpParameters,
-                        };
-                    }
-                    async stopSending(localId) {
-                        this._assertSendDirection();
-                        logger.debug('stopSending() [localId:%s]', localId);
-                        const track = this._mapSendLocalIdTrack.get(localId);
-                        if (!track) throw new Error('track not found');
-                        this._mapSendLocalIdTrack.delete(localId);
-                        this._sendStream.removeTrack(track);
-                        this._pc.addStream(this._sendStream);
-                        const offer = await this._pc.createOffer();
-                        logger.debug('stopSending() | calling pc.setLocalDescription() [offer:%o]', offer);
-                        try {
-                            await this._pc.setLocalDescription(offer);
-                        } catch (error) {
-                            // NOTE: If there are no sending tracks, setLocalDescription() will fail with
-                            // "Failed to create channels". If so, ignore it.
-                            if (this._sendStream.getTracks().length === 0) {
-                                logger.warn(
-                                    'stopSending() | ignoring expected error due no sending tracks: %s',
-                                    error.toString(),
-                                );
-                                return;
-                            }
-                            throw error;
-                        }
-                        if (this._pc.signalingState === 'stable') return;
-                        const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
-                        logger.debug('stopSending() | calling pc.setRemoteDescription() [answer:%o]', answer);
-                        await this._pc.setRemoteDescription(answer);
-                    }
-                    async replaceTrack(
-                        // eslint-disable-next-line @typescript-eslint/no-unused-vars
-                        localId,
-                        track,
-                    ) {
-                        throw new errors_1.UnsupportedError('not implemented');
-                    }
-                    // eslint-disable-next-line @typescript-eslint/no-unused-vars
-                    async setMaxSpatialLayer(localId, spatialLayer) {
-                        throw new errors_1.UnsupportedError('not implemented');
-                    }
-                    // eslint-disable-next-line @typescript-eslint/no-unused-vars
-                    async setRtpEncodingParameters(localId, params) {
-                        throw new errors_1.UnsupportedError('not implemented');
-                    }
-                    // eslint-disable-next-line @typescript-eslint/no-unused-vars
-                    async getSenderStats(localId) {
-                        throw new errors_1.UnsupportedError('not implemented');
-                    }
-                    async sendDataChannel({ ordered, maxPacketLifeTime, maxRetransmits, label, protocol, priority }) {
-                        this._assertSendDirection();
-                        const options = {
-                            negotiated: true,
-                            id: this._nextSendSctpStreamId,
-                            ordered,
-                            maxPacketLifeTime,
-                            maxRetransmitTime: maxPacketLifeTime,
-                            maxRetransmits,
-                            protocol,
-                            priority,
-                        };
-                        logger.debug('sendDataChannel() [options:%o]', options);
-                        const dataChannel = this._pc.createDataChannel(label, options);
-                        // Increase next id.
-                        this._nextSendSctpStreamId = ++this._nextSendSctpStreamId % SCTP_NUM_STREAMS.MIS;
-                        // If this is the first DataChannel we need to create the SDP answer with
-                        // m=application section.
-                        if (!this._hasDataChannelMediaSection) {
-                            const offer = await this._pc.createOffer();
-                            const localSdpObject = sdpTransform.parse(offer.sdp);
-                            const offerMediaObject = localSdpObject.media.find((m) => m.type === 'application');
-                            if (!this._transportReady)
-                                await this._setupTransport({ localDtlsRole: 'server', localSdpObject });
-                            logger.debug('sendDataChannel() | calling pc.setLocalDescription() [offer:%o]', offer);
-                            await this._pc.setLocalDescription(offer);
-                            this._remoteSdp.sendSctpAssociation({ offerMediaObject });
-                            const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
-                            logger.debug('sendDataChannel() | calling pc.setRemoteDescription() [answer:%o]', answer);
-                            await this._pc.setRemoteDescription(answer);
-                            this._hasDataChannelMediaSection = true;
-                        }
-                        const sctpStreamParameters = {
-                            streamId: options.id,
-                            ordered: options.ordered,
-                            maxPacketLifeTime: options.maxPacketLifeTime,
-                            maxRetransmits: options.maxRetransmits,
-                        };
-                        return { dataChannel, sctpStreamParameters };
-                    }
-                    async receive({ trackId, kind, rtpParameters }) {
-                        this._assertRecvDirection();
-                        logger.debug('receive() [trackId:%s, kind:%s]', trackId, kind);
-                        const localId = trackId;
-                        const mid = kind;
-                        let streamId = rtpParameters.rtcp.cname;
-                        // NOTE: In React-Native we cannot reuse the same remote MediaStream for new
-                        // remote tracks. This is because react-native-webrtc does not react on new
-                        // tracks generated within already existing streams, so force the streamId
-                        // to be different.
-                        logger.debug(
-                            'receive() | forcing a random remote streamId to avoid well known bug in react-native-webrtc',
-                        );
-                        streamId += `-hack-${utils.generateRandomNumber()}`;
-                        this._remoteSdp.receive({
-                            mid,
-                            kind,
-                            offerRtpParameters: rtpParameters,
-                            streamId,
-                            trackId,
-                        });
-                        const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
-                        logger.debug('receive() | calling pc.setRemoteDescription() [offer:%o]', offer);
-                        await this._pc.setRemoteDescription(offer);
-                        let answer = await this._pc.createAnswer();
-                        const localSdpObject = sdpTransform.parse(answer.sdp);
-                        const answerMediaObject = localSdpObject.media.find((m) => String(m.mid) === mid);
-                        // May need to modify codec parameters in the answer based on codec
-                        // parameters in the offer.
-                        sdpCommonUtils.applyCodecParameters({
-                            offerRtpParameters: rtpParameters,
-                            answerMediaObject,
-                        });
-                        answer = { type: 'answer', sdp: sdpTransform.write(localSdpObject) };
-                        if (!this._transportReady)
-                            await this._setupTransport({ localDtlsRole: 'client', localSdpObject });
-                        logger.debug('receive() | calling pc.setLocalDescription() [answer:%o]', answer);
-                        await this._pc.setLocalDescription(answer);
-                        const stream = this._pc.getRemoteStreams().find((s) => s.id === streamId);
-                        const track = stream.getTrackById(localId);
-                        if (!track) throw new Error('remote track not found');
-                        // Insert into the map.
-                        this._mapRecvLocalIdInfo.set(localId, { mid, rtpParameters });
-                        return { localId, track };
-                    }
-                    async stopReceiving(localId) {
-                        this._assertRecvDirection();
-                        logger.debug('stopReceiving() [localId:%s]', localId);
-                        const { mid, rtpParameters } = this._mapRecvLocalIdInfo.get(localId) || {};
-                        // Remove from the map.
-                        this._mapRecvLocalIdInfo.delete(localId);
-                        this._remoteSdp.planBStopReceiving({ mid: mid, offerRtpParameters: rtpParameters });
-                        const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
-                        logger.debug('stopReceiving() | calling pc.setRemoteDescription() [offer:%o]', offer);
-                        await this._pc.setRemoteDescription(offer);
-                        const answer = await this._pc.createAnswer();
-                        logger.debug('stopReceiving() | calling pc.setLocalDescription() [answer:%o]', answer);
-                        await this._pc.setLocalDescription(answer);
-                    }
-                    // eslint-disable-next-line @typescript-eslint/no-unused-vars
-                    async getReceiverStats(localId) {
-                        throw new errors_1.UnsupportedError('not implemented');
-                    }
-                    async receiveDataChannel({ sctpStreamParameters, label, protocol }) {
-                        this._assertRecvDirection();
-                        const { streamId, ordered, maxPacketLifeTime, maxRetransmits } = sctpStreamParameters;
-                        const options = {
-                            negotiated: true,
-                            id: streamId,
-                            ordered,
-                            maxPacketLifeTime,
-                            maxRetransmitTime: maxPacketLifeTime,
-                            maxRetransmits,
-                            protocol,
-                        };
-                        logger.debug('receiveDataChannel() [options:%o]', options);
-                        const dataChannel = this._pc.createDataChannel(label, options);
-                        // If this is the first DataChannel we need to create the SDP offer with
-                        // m=application section.
-                        if (!this._hasDataChannelMediaSection) {
-                            this._remoteSdp.receiveSctpAssociation({ oldDataChannelSpec: true });
-                            const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
-                            logger.debug('receiveDataChannel() | calling pc.setRemoteDescription() [offer:%o]', offer);
-                            await this._pc.setRemoteDescription(offer);
-                            const answer = await this._pc.createAnswer();
-                            if (!this._transportReady) {
-                                const localSdpObject = sdpTransform.parse(answer.sdp);
-                                await this._setupTransport({ localDtlsRole: 'client', localSdpObject });
-                            }
-                            logger.debug(
-                                'receiveDataChannel() | calling pc.setRemoteDescription() [answer:%o]',
-                                answer,
-                            );
-                            await this._pc.setLocalDescription(answer);
-                            this._hasDataChannelMediaSection = true;
-                        }
-                        return { dataChannel };
-                    }
-                    async _setupTransport({ localDtlsRole, localSdpObject }) {
-                        if (!localSdpObject) localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
-                        // Get our local DTLS parameters.
-                        const dtlsParameters = sdpCommonUtils.extractDtlsParameters({ sdpObject: localSdpObject });
-                        // Set our DTLS role.
-                        dtlsParameters.role = localDtlsRole;
-                        // Update the remote DTLS role in the SDP.
-                        this._remoteSdp.updateDtlsRole(localDtlsRole === 'client' ? 'server' : 'client');
-                        // Need to tell the remote transport about our parameters.
-                        await this.safeEmitAsPromise('@connect', { dtlsParameters });
-                        this._transportReady = true;
-                    }
-                    _assertSendDirection() {
-                        if (this._direction !== 'send') {
-                            throw new Error('method can just be called for handlers with "send" direction');
-                        }
-                    }
-                    _assertRecvDirection() {
-                        if (this._direction !== 'recv') {
-                            throw new Error('method can just be called for handlers with "recv" direction');
-                        }
-                    }
-                }
-                exports.ReactNative = ReactNative;
-            },
+                audio: ortc.getSendingRtpParameters('audio', extendedRtpCapabilities),
+                video: ortc.getSendingRtpParameters('video', extendedRtpCapabilities)
+            };
+        this._sendingRemoteRtpParametersByKind =
             {
-                '../Logger': 12,
-                '../errors': 15,
-                '../ortc': 33,
-                '../utils': 36,
-                './HandlerInterface': 22,
-                './sdp/RemoteSdp': 28,
-                './sdp/commonUtils': 29,
-                './sdp/planBUtils': 30,
-                'sdp-transform': 41,
-            },
-        ],
-        24: [
-            function (require, module, exports) {
-                'use strict';
-                Object.defineProperty(exports, '__esModule', { value: true });
-                const sdpTransform = require('sdp-transform');
-                const Logger_1 = require('../Logger');
-                const utils = require('../utils');
-                const ortc = require('../ortc');
-                const sdpCommonUtils = require('./sdp/commonUtils');
-                const sdpPlanBUtils = require('./sdp/planBUtils');
-                const HandlerInterface_1 = require('./HandlerInterface');
-                const RemoteSdp_1 = require('./sdp/RemoteSdp');
-                const logger = new Logger_1.Logger('Safari11');
-                const SCTP_NUM_STREAMS = { OS: 1024, MIS: 1024 };
-                class Safari11 extends HandlerInterface_1.HandlerInterface {
-                    constructor() {
-                        super();
-                        // Local stream for sending.
-                        this._sendStream = new MediaStream();
-                        // Map of RTCRtpSender indexed by localId.
-                        this._mapSendLocalIdRtpSender = new Map();
-                        // Next sending localId.
-                        this._nextSendLocalId = 0;
-                        // Map of MID, RTP parameters and RTCRtpReceiver indexed by local id.
-                        // Value is an Object with mid, rtpParameters and rtpReceiver.
-                        this._mapRecvLocalIdInfo = new Map();
-                        // Whether a DataChannel m=application section has been created.
-                        this._hasDataChannelMediaSection = false;
-                        // Sending DataChannel id value counter. Incremented for each new DataChannel.
-                        this._nextSendSctpStreamId = 0;
-                        // Got transport local and remote parameters.
-                        this._transportReady = false;
-                    }
-                    /**
-                     * Creates a factory function.
-                     */
-                    static createFactory() {
-                        return () => new Safari11();
-                    }
-                    get name() {
-                        return 'Safari11';
-                    }
-                    close() {
-                        logger.debug('close()');
-                        // Close RTCPeerConnection.
-                        if (this._pc) {
-                            try {
-                                this._pc.close();
-                            } catch (error) {}
-                        }
-                    }
-                    async getNativeRtpCapabilities() {
-                        logger.debug('getNativeRtpCapabilities()');
-                        const pc = new RTCPeerConnection({
-                            iceServers: [],
-                            iceTransportPolicy: 'all',
-                            bundlePolicy: 'max-bundle',
-                            rtcpMuxPolicy: 'require',
-                            sdpSemantics: 'plan-b',
-                        });
-                        try {
-                            const offer = await pc.createOffer({
-                                offerToReceiveAudio: true,
-                                offerToReceiveVideo: true,
-                            });
-                            try {
-                                pc.close();
-                            } catch (error) {}
-                            const sdpObject = sdpTransform.parse(offer.sdp);
-                            const nativeRtpCapabilities = sdpCommonUtils.extractRtpCapabilities({ sdpObject });
-                            return nativeRtpCapabilities;
-                        } catch (error) {
-                            try {
-                                pc.close();
-                            } catch (error2) {}
-                            throw error;
-                        }
-                    }
-                    async getNativeSctpCapabilities() {
-                        logger.debug('getNativeSctpCapabilities()');
-                        return {
-                            numStreams: SCTP_NUM_STREAMS,
-                        };
-                    }
-                    run({
-                        direction,
-                        iceParameters,
-                        iceCandidates,
-                        dtlsParameters,
-                        sctpParameters,
-                        iceServers,
-                        iceTransportPolicy,
-                        additionalSettings,
-                        proprietaryConstraints,
-                        extendedRtpCapabilities,
-                    }) {
-                        logger.debug('run()');
-                        this._direction = direction;
-                        this._remoteSdp = new RemoteSdp_1.RemoteSdp({
-                            iceParameters,
-                            iceCandidates,
-                            dtlsParameters,
-                            sctpParameters,
-                            planB: true,
-                        });
-                        this._sendingRtpParametersByKind = {
-                            audio: ortc.getSendingRtpParameters('audio', extendedRtpCapabilities),
-                            video: ortc.getSendingRtpParameters('video', extendedRtpCapabilities),
-                        };
-                        this._sendingRemoteRtpParametersByKind = {
-                            audio: ortc.getSendingRemoteRtpParameters('audio', extendedRtpCapabilities),
-                            video: ortc.getSendingRemoteRtpParameters('video', extendedRtpCapabilities),
-                        };
-                        this._pc = new RTCPeerConnection(
-                            {
-                                iceServers: iceServers || [],
-                                iceTransportPolicy: iceTransportPolicy || 'all',
-                                bundlePolicy: 'max-bundle',
-                                rtcpMuxPolicy: 'require',
-                                ...additionalSettings,
-                            },
-                            proprietaryConstraints,
-                        );
-                        // Handle RTCPeerConnection connection status.
-                        this._pc.addEventListener('iceconnectionstatechange', () => {
-                            switch (this._pc.iceConnectionState) {
-                                case 'checking':
-                                    this.emit('@connectionstatechange', 'connecting');
-                                    break;
-                                case 'connected':
-                                case 'completed':
-                                    this.emit('@connectionstatechange', 'connected');
-                                    break;
-                                case 'failed':
-                                    this.emit('@connectionstatechange', 'failed');
-                                    break;
-                                case 'disconnected':
-                                    this.emit('@connectionstatechange', 'disconnected');
-                                    break;
-                                case 'closed':
-                                    this.emit('@connectionstatechange', 'closed');
-                                    break;
-                            }
-                        });
-                    }
-                    async updateIceServers(iceServers) {
-                        logger.debug('updateIceServers()');
-                        const configuration = this._pc.getConfiguration();
-                        configuration.iceServers = iceServers;
-                        this._pc.setConfiguration(configuration);
-                    }
-                    async restartIce(iceParameters) {
-                        logger.debug('restartIce()');
-                        // Provide the remote SDP handler with new remote ICE parameters.
-                        this._remoteSdp.updateIceParameters(iceParameters);
-                        if (!this._transportReady) return;
-                        if (this._direction === 'send') {
-                            const offer = await this._pc.createOffer({ iceRestart: true });
-                            logger.debug('restartIce() | calling pc.setLocalDescription() [offer:%o]', offer);
-                            await this._pc.setLocalDescription(offer);
-                            const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
-                            logger.debug('restartIce() | calling pc.setRemoteDescription() [answer:%o]', answer);
-                            await this._pc.setRemoteDescription(answer);
-                        } else {
-                            const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
-                            logger.debug('restartIce() | calling pc.setRemoteDescription() [offer:%o]', offer);
-                            await this._pc.setRemoteDescription(offer);
-                            const answer = await this._pc.createAnswer();
-                            logger.debug('restartIce() | calling pc.setLocalDescription() [answer:%o]', answer);
-                            await this._pc.setLocalDescription(answer);
-                        }
-                    }
-                    async getTransportStats() {
-                        return this._pc.getStats();
-                    }
-                    async send({ track, encodings, codecOptions, codec }) {
-                        this._assertSendDirection();
-                        logger.debug('send() [kind:%s, track.id:%s]', track.kind, track.id);
-                        if (codec) {
-                            logger.warn('send() | codec selection is not available in %s handler', this.name);
-                        }
-                        this._sendStream.addTrack(track);
-                        this._pc.addTrack(track, this._sendStream);
-                        let offer = await this._pc.createOffer();
-                        let localSdpObject = sdpTransform.parse(offer.sdp);
-                        let offerMediaObject;
-                        const sendingRtpParameters = utils.clone(this._sendingRtpParametersByKind[track.kind]);
-                        sendingRtpParameters.codecs = ortc.reduceCodecs(sendingRtpParameters.codecs);
-                        const sendingRemoteRtpParameters = utils.clone(
-                            this._sendingRemoteRtpParametersByKind[track.kind],
-                        );
-                        sendingRemoteRtpParameters.codecs = ortc.reduceCodecs(sendingRemoteRtpParameters.codecs);
-                        if (!this._transportReady)
-                            await this._setupTransport({ localDtlsRole: 'server', localSdpObject });
-                        if (track.kind === 'video' && encodings && encodings.length > 1) {
-                            logger.debug('send() | enabling simulcast');
-                            localSdpObject = sdpTransform.parse(offer.sdp);
-                            offerMediaObject = localSdpObject.media.find((m) => m.type === 'video');
-                            sdpPlanBUtils.addLegacySimulcast({
-                                offerMediaObject,
-                                track,
-                                numStreams: encodings.length,
-                            });
-                            offer = { type: 'offer', sdp: sdpTransform.write(localSdpObject) };
-                        }
-                        logger.debug('send() | calling pc.setLocalDescription() [offer:%o]', offer);
-                        await this._pc.setLocalDescription(offer);
-                        localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
-                        offerMediaObject = localSdpObject.media.find((m) => m.type === track.kind);
-                        // Set RTCP CNAME.
-                        sendingRtpParameters.rtcp.cname = sdpCommonUtils.getCname({ offerMediaObject });
-                        // Set RTP encodings.
-                        sendingRtpParameters.encodings = sdpPlanBUtils.getRtpEncodings({ offerMediaObject, track });
-                        // Complete encodings with given values.
-                        if (encodings) {
-                            for (let idx = 0; idx < sendingRtpParameters.encodings.length; ++idx) {
-                                if (encodings[idx]) Object.assign(sendingRtpParameters.encodings[idx], encodings[idx]);
-                            }
-                        }
-                        // If VP8 and there is effective simulcast, add scalabilityMode to each
-                        // encoding.
-                        if (
-                            sendingRtpParameters.encodings.length > 1 &&
-                            sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/vp8'
-                        ) {
-                            for (const encoding of sendingRtpParameters.encodings) {
-                                encoding.scalabilityMode = 'S1T3';
-                            }
-                        }
-                        this._remoteSdp.send({
-                            offerMediaObject,
-                            offerRtpParameters: sendingRtpParameters,
-                            answerRtpParameters: sendingRemoteRtpParameters,
-                            codecOptions,
-                        });
-                        const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
-                        logger.debug('send() | calling pc.setRemoteDescription() [answer:%o]', answer);
-                        await this._pc.setRemoteDescription(answer);
-                        const localId = String(this._nextSendLocalId);
-                        this._nextSendLocalId++;
-                        const rtpSender = this._pc.getSenders().find((s) => s.track === track);
-                        // Insert into the map.
-                        this._mapSendLocalIdRtpSender.set(localId, rtpSender);
-                        return {
-                            localId: localId,
-                            rtpParameters: sendingRtpParameters,
-                            rtpSender,
-                        };
-                    }
-                    async stopSending(localId) {
-                        this._assertSendDirection();
-                        const rtpSender = this._mapSendLocalIdRtpSender.get(localId);
-                        if (!rtpSender) throw new Error('associated RTCRtpSender not found');
-                        if (rtpSender.track) this._sendStream.removeTrack(rtpSender.track);
-                        this._mapSendLocalIdRtpSender.delete(localId);
-                        const offer = await this._pc.createOffer();
-                        logger.debug('stopSending() | calling pc.setLocalDescription() [offer:%o]', offer);
-                        try {
-                            await this._pc.setLocalDescription(offer);
-                        } catch (error) {
-                            // NOTE: If there are no sending tracks, setLocalDescription() will fail with
-                            // "Failed to create channels". If so, ignore it.
-                            if (this._sendStream.getTracks().length === 0) {
-                                logger.warn(
-                                    'stopSending() | ignoring expected error due no sending tracks: %s',
-                                    error.toString(),
-                                );
-                                return;
-                            }
-                            throw error;
-                        }
-                        if (this._pc.signalingState === 'stable') return;
-                        const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
-                        logger.debug('stopSending() | calling pc.setRemoteDescription() [answer:%o]', answer);
-                        await this._pc.setRemoteDescription(answer);
-                    }
-                    async replaceTrack(localId, track) {
-                        this._assertSendDirection();
-                        if (track) {
-                            logger.debug('replaceTrack() [localId:%s, track.id:%s]', localId, track.id);
-                        } else {
-                            logger.debug('replaceTrack() [localId:%s, no track]', localId);
-                        }
-                        const rtpSender = this._mapSendLocalIdRtpSender.get(localId);
-                        if (!rtpSender) throw new Error('associated RTCRtpSender not found');
-                        const oldTrack = rtpSender.track;
-                        await rtpSender.replaceTrack(track);
-                        // Remove the old track from the local stream.
-                        if (oldTrack) this._sendStream.removeTrack(oldTrack);
-                        // Add the new track to the local stream.
-                        if (track) this._sendStream.addTrack(track);
-                    }
-                    async setMaxSpatialLayer(localId, spatialLayer) {
-                        this._assertSendDirection();
-                        logger.debug('setMaxSpatialLayer() [localId:%s, spatialLayer:%s]', localId, spatialLayer);
-                        const rtpSender = this._mapSendLocalIdRtpSender.get(localId);
-                        if (!rtpSender) throw new Error('associated RTCRtpSender not found');
-                        const parameters = rtpSender.getParameters();
-                        parameters.encodings.forEach((encoding, idx) => {
-                            if (idx <= spatialLayer) encoding.active = true;
-                            else encoding.active = false;
-                        });
-                        await rtpSender.setParameters(parameters);
-                    }
-                    async setRtpEncodingParameters(localId, params) {
-                        this._assertSendDirection();
-                        logger.debug('setRtpEncodingParameters() [localId:%s, params:%o]', localId, params);
-                        const rtpSender = this._mapSendLocalIdRtpSender.get(localId);
-                        if (!rtpSender) throw new Error('associated RTCRtpSender not found');
-                        const parameters = rtpSender.getParameters();
-                        parameters.encodings.forEach((encoding, idx) => {
-                            parameters.encodings[idx] = { ...encoding, ...params };
-                        });
-                        await rtpSender.setParameters(parameters);
-                    }
-                    async getSenderStats(localId) {
-                        this._assertSendDirection();
-                        const rtpSender = this._mapSendLocalIdRtpSender.get(localId);
-                        if (!rtpSender) throw new Error('associated RTCRtpSender not found');
-                        return rtpSender.getStats();
-                    }
-                    async sendDataChannel({ ordered, maxPacketLifeTime, maxRetransmits, label, protocol, priority }) {
-                        this._assertSendDirection();
-                        const options = {
-                            negotiated: true,
-                            id: this._nextSendSctpStreamId,
-                            ordered,
-                            maxPacketLifeTime,
-                            maxRetransmits,
-                            protocol,
-                            priority,
-                        };
-                        logger.debug('sendDataChannel() [options:%o]', options);
-                        const dataChannel = this._pc.createDataChannel(label, options);
-                        // Increase next id.
-                        this._nextSendSctpStreamId = ++this._nextSendSctpStreamId % SCTP_NUM_STREAMS.MIS;
-                        // If this is the first DataChannel we need to create the SDP answer with
-                        // m=application section.
-                        if (!this._hasDataChannelMediaSection) {
-                            const offer = await this._pc.createOffer();
-                            const localSdpObject = sdpTransform.parse(offer.sdp);
-                            const offerMediaObject = localSdpObject.media.find((m) => m.type === 'application');
-                            if (!this._transportReady)
-                                await this._setupTransport({ localDtlsRole: 'server', localSdpObject });
-                            logger.debug('sendDataChannel() | calling pc.setLocalDescription() [offer:%o]', offer);
-                            await this._pc.setLocalDescription(offer);
-                            this._remoteSdp.sendSctpAssociation({ offerMediaObject });
-                            const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
-                            logger.debug('sendDataChannel() | calling pc.setRemoteDescription() [answer:%o]', answer);
-                            await this._pc.setRemoteDescription(answer);
-                            this._hasDataChannelMediaSection = true;
-                        }
-                        const sctpStreamParameters = {
-                            streamId: options.id,
-                            ordered: options.ordered,
-                            maxPacketLifeTime: options.maxPacketLifeTime,
-                            maxRetransmits: options.maxRetransmits,
-                        };
-                        return { dataChannel, sctpStreamParameters };
-                    }
-                    async receive({ trackId, kind, rtpParameters }) {
-                        this._assertRecvDirection();
-                        logger.debug('receive() [trackId:%s, kind:%s]', trackId, kind);
-                        const localId = trackId;
-                        const mid = kind;
-                        this._remoteSdp.receive({
-                            mid,
-                            kind,
-                            offerRtpParameters: rtpParameters,
-                            streamId: rtpParameters.rtcp.cname,
-                            trackId,
-                        });
-                        const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
-                        logger.debug('receive() | calling pc.setRemoteDescription() [offer:%o]', offer);
-                        await this._pc.setRemoteDescription(offer);
-                        let answer = await this._pc.createAnswer();
-                        const localSdpObject = sdpTransform.parse(answer.sdp);
-                        const answerMediaObject = localSdpObject.media.find((m) => String(m.mid) === mid);
-                        // May need to modify codec parameters in the answer based on codec
-                        // parameters in the offer.
-                        sdpCommonUtils.applyCodecParameters({
-                            offerRtpParameters: rtpParameters,
-                            answerMediaObject,
-                        });
-                        answer = { type: 'answer', sdp: sdpTransform.write(localSdpObject) };
-                        if (!this._transportReady)
-                            await this._setupTransport({ localDtlsRole: 'client', localSdpObject });
-                        logger.debug('receive() | calling pc.setLocalDescription() [answer:%o]', answer);
-                        await this._pc.setLocalDescription(answer);
-                        const rtpReceiver = this._pc.getReceivers().find((r) => r.track && r.track.id === localId);
-                        if (!rtpReceiver) throw new Error('new RTCRtpReceiver not');
-                        // Insert into the map.
-                        this._mapRecvLocalIdInfo.set(localId, { mid, rtpParameters, rtpReceiver });
-                        return {
-                            localId,
-                            track: rtpReceiver.track,
-                            rtpReceiver,
-                        };
-                    }
-                    async stopReceiving(localId) {
-                        this._assertRecvDirection();
-                        logger.debug('stopReceiving() [localId:%s]', localId);
-                        const { mid, rtpParameters } = this._mapRecvLocalIdInfo.get(localId) || {};
-                        // Remove from the map.
-                        this._mapRecvLocalIdInfo.delete(localId);
-                        this._remoteSdp.planBStopReceiving({ mid: mid, offerRtpParameters: rtpParameters });
-                        const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
-                        logger.debug('stopReceiving() | calling pc.setRemoteDescription() [offer:%o]', offer);
-                        await this._pc.setRemoteDescription(offer);
-                        const answer = await this._pc.createAnswer();
-                        logger.debug('stopReceiving() | calling pc.setLocalDescription() [answer:%o]', answer);
-                        await this._pc.setLocalDescription(answer);
-                    }
-                    async getReceiverStats(localId) {
-                        this._assertRecvDirection();
-                        const { rtpReceiver } = this._mapRecvLocalIdInfo.get(localId) || {};
-                        if (!rtpReceiver) throw new Error('associated RTCRtpReceiver not found');
-                        return rtpReceiver.getStats();
-                    }
-                    async receiveDataChannel({ sctpStreamParameters, label, protocol }) {
-                        this._assertRecvDirection();
-                        const { streamId, ordered, maxPacketLifeTime, maxRetransmits } = sctpStreamParameters;
-                        const options = {
-                            negotiated: true,
-                            id: streamId,
-                            ordered,
-                            maxPacketLifeTime,
-                            maxRetransmits,
-                            protocol,
-                        };
-                        logger.debug('receiveDataChannel() [options:%o]', options);
-                        const dataChannel = this._pc.createDataChannel(label, options);
-                        // If this is the first DataChannel we need to create the SDP offer with
-                        // m=application section.
-                        if (!this._hasDataChannelMediaSection) {
-                            this._remoteSdp.receiveSctpAssociation({ oldDataChannelSpec: true });
-                            const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
-                            logger.debug('receiveDataChannel() | calling pc.setRemoteDescription() [offer:%o]', offer);
-                            await this._pc.setRemoteDescription(offer);
-                            const answer = await this._pc.createAnswer();
-                            if (!this._transportReady) {
-                                const localSdpObject = sdpTransform.parse(answer.sdp);
-                                await this._setupTransport({ localDtlsRole: 'client', localSdpObject });
-                            }
-                            logger.debug(
-                                'receiveDataChannel() | calling pc.setRemoteDescription() [answer:%o]',
-                                answer,
-                            );
-                            await this._pc.setLocalDescription(answer);
-                            this._hasDataChannelMediaSection = true;
-                        }
-                        return { dataChannel };
-                    }
-                    async _setupTransport({ localDtlsRole, localSdpObject }) {
-                        if (!localSdpObject) localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
-                        // Get our local DTLS parameters.
-                        const dtlsParameters = sdpCommonUtils.extractDtlsParameters({ sdpObject: localSdpObject });
-                        // Set our DTLS role.
-                        dtlsParameters.role = localDtlsRole;
-                        // Update the remote DTLS role in the SDP.
-                        this._remoteSdp.updateDtlsRole(localDtlsRole === 'client' ? 'server' : 'client');
-                        // Need to tell the remote transport about our parameters.
-                        await this.safeEmitAsPromise('@connect', { dtlsParameters });
-                        this._transportReady = true;
-                    }
-                    _assertSendDirection() {
-                        if (this._direction !== 'send') {
-                            throw new Error('method can just be called for handlers with "send" direction');
-                        }
-                    }
-                    _assertRecvDirection() {
-                        if (this._direction !== 'recv') {
-                            throw new Error('method can just be called for handlers with "recv" direction');
-                        }
-                    }
-                }
-                exports.Safari11 = Safari11;
-            },
+                audio: ortc.getSendingRemoteRtpParameters('audio', extendedRtpCapabilities),
+                video: ortc.getSendingRemoteRtpParameters('video', extendedRtpCapabilities)
+            };
+        this._pc = new RTCPeerConnection(Object.assign({ iceServers: iceServers || [], iceTransportPolicy: iceTransportPolicy || 'all', bundlePolicy: 'max-bundle', rtcpMuxPolicy: 'require', sdpSemantics: 'unified-plan' }, additionalSettings), proprietaryConstraints);
+        // Handle RTCPeerConnection connection status.
+        this._pc.addEventListener('iceconnectionstatechange', () => {
+            switch (this._pc.iceConnectionState) {
+                case 'checking':
+                    this.emit('@connectionstatechange', 'connecting');
+                    break;
+                case 'connected':
+                case 'completed':
+                    this.emit('@connectionstatechange', 'connected');
+                    break;
+                case 'failed':
+                    this.emit('@connectionstatechange', 'failed');
+                    break;
+                case 'disconnected':
+                    this.emit('@connectionstatechange', 'disconnected');
+                    break;
+                case 'closed':
+                    this.emit('@connectionstatechange', 'closed');
+                    break;
+            }
+        });
+    }
+    async updateIceServers(iceServers) {
+        logger.debug('updateIceServers()');
+        const configuration = this._pc.getConfiguration();
+        configuration.iceServers = iceServers;
+        this._pc.setConfiguration(configuration);
+    }
+    async restartIce(iceParameters) {
+        logger.debug('restartIce()');
+        // Provide the remote SDP handler with new remote ICE parameters.
+        this._remoteSdp.updateIceParameters(iceParameters);
+        if (!this._transportReady)
+            return;
+        if (this._direction === 'send') {
+            const offer = await this._pc.createOffer({ iceRestart: true });
+            logger.debug('restartIce() | calling pc.setLocalDescription() [offer:%o]', offer);
+            await this._pc.setLocalDescription(offer);
+            const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
+            logger.debug('restartIce() | calling pc.setRemoteDescription() [answer:%o]', answer);
+            await this._pc.setRemoteDescription(answer);
+        }
+        else {
+            const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
+            logger.debug('restartIce() | calling pc.setRemoteDescription() [offer:%o]', offer);
+            await this._pc.setRemoteDescription(offer);
+            const answer = await this._pc.createAnswer();
+            logger.debug('restartIce() | calling pc.setLocalDescription() [answer:%o]', answer);
+            await this._pc.setLocalDescription(answer);
+        }
+    }
+    async getTransportStats() {
+        return this._pc.getStats();
+    }
+    async send({ track, encodings, codecOptions, codec }) {
+        this._assertSendDirection();
+        logger.debug('send() [kind:%s, track.id:%s]', track.kind, track.id);
+        const sendingRtpParameters = utils.clone(this._sendingRtpParametersByKind[track.kind], {});
+        // This may throw.
+        sendingRtpParameters.codecs =
+            ortc.reduceCodecs(sendingRtpParameters.codecs, codec);
+        const sendingRemoteRtpParameters = utils.clone(this._sendingRemoteRtpParametersByKind[track.kind], {});
+        // This may throw.
+        sendingRemoteRtpParameters.codecs =
+            ortc.reduceCodecs(sendingRemoteRtpParameters.codecs, codec);
+        const mediaSectionIdx = this._remoteSdp.getNextMediaSectionIdx();
+        const transceiver = this._pc.addTransceiver(track, { direction: 'sendonly', streams: [this._sendStream] });
+        let offer = await this._pc.createOffer();
+        let localSdpObject = sdpTransform.parse(offer.sdp);
+        let offerMediaObject;
+        if (!this._transportReady)
+            await this._setupTransport({ localDtlsRole: 'server', localSdpObject });
+        if (encodings && encodings.length > 1) {
+            logger.debug('send() | enabling legacy simulcast');
+            localSdpObject = sdpTransform.parse(offer.sdp);
+            offerMediaObject = localSdpObject.media[mediaSectionIdx.idx];
+            sdpUnifiedPlanUtils.addLegacySimulcast({
+                offerMediaObject,
+                numStreams: encodings.length
+            });
+            offer = { type: 'offer', sdp: sdpTransform.write(localSdpObject) };
+        }
+        // Special case for VP9 with SVC.
+        let hackVp9Svc = false;
+        const layers = scalabilityModes_1.parse((encodings || [{}])[0].scalabilityMode);
+        if (encodings &&
+            encodings.length === 1 &&
+            layers.spatialLayers > 1 &&
+            sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/vp9') {
+            logger.debug('send() | enabling legacy simulcast for VP9 SVC');
+            hackVp9Svc = true;
+            localSdpObject = sdpTransform.parse(offer.sdp);
+            offerMediaObject = localSdpObject.media[mediaSectionIdx.idx];
+            sdpUnifiedPlanUtils.addLegacySimulcast({
+                offerMediaObject,
+                numStreams: layers.spatialLayers
+            });
+            offer = { type: 'offer', sdp: sdpTransform.write(localSdpObject) };
+        }
+        logger.debug('send() | calling pc.setLocalDescription() [offer:%o]', offer);
+        await this._pc.setLocalDescription(offer);
+        // If encodings are given, apply them now.
+        if (encodings) {
+            logger.debug('send() | applying given encodings');
+            const parameters = transceiver.sender.getParameters();
+            for (let idx = 0; idx < (parameters.encodings || []).length; ++idx) {
+                const encoding = parameters.encodings[idx];
+                const desiredEncoding = encodings[idx];
+                // Should not happen but just in case.
+                if (!desiredEncoding)
+                    break;
+                parameters.encodings[idx] = Object.assign(encoding, desiredEncoding);
+            }
+            await transceiver.sender.setParameters(parameters);
+        }
+        // We can now get the transceiver.mid.
+        const localId = transceiver.mid;
+        // Set MID.
+        sendingRtpParameters.mid = localId;
+        localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
+        offerMediaObject = localSdpObject.media[mediaSectionIdx.idx];
+        // Set RTCP CNAME.
+        sendingRtpParameters.rtcp.cname =
+            sdpCommonUtils.getCname({ offerMediaObject });
+        // Set RTP encodings.
+        sendingRtpParameters.encodings =
+            sdpUnifiedPlanUtils.getRtpEncodings({ offerMediaObject });
+        // Complete encodings with given values.
+        if (encodings) {
+            for (let idx = 0; idx < sendingRtpParameters.encodings.length; ++idx) {
+                if (encodings[idx])
+                    Object.assign(sendingRtpParameters.encodings[idx], encodings[idx]);
+            }
+        }
+        // Hack for VP9 SVC.
+        if (hackVp9Svc) {
+            sendingRtpParameters.encodings = [sendingRtpParameters.encodings[0]];
+        }
+        // If VP8 or H264 and there is effective simulcast, add scalabilityMode to
+        // each encoding.
+        if (sendingRtpParameters.encodings.length > 1 &&
+            (sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/vp8' ||
+                sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/h264')) {
+            for (const encoding of sendingRtpParameters.encodings) {
+                encoding.scalabilityMode = 'S1T3';
+            }
+        }
+        this._remoteSdp.send({
+            offerMediaObject,
+            reuseMid: mediaSectionIdx.reuseMid,
+            offerRtpParameters: sendingRtpParameters,
+            answerRtpParameters: sendingRemoteRtpParameters,
+            codecOptions
+        });
+        const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
+        logger.debug('send() | calling pc.setRemoteDescription() [answer:%o]', answer);
+        await this._pc.setRemoteDescription(answer);
+        // Store in the map.
+        this._mapMidTransceiver.set(localId, transceiver);
+        return {
+            localId,
+            rtpParameters: sendingRtpParameters,
+            rtpSender: transceiver.sender
+        };
+    }
+    async stopSending(localId) {
+        this._assertSendDirection();
+        logger.debug('stopSending() [localId:%s]', localId);
+        const transceiver = this._mapMidTransceiver.get(localId);
+        if (!transceiver)
+            throw new Error('associated RTCRtpTransceiver not found');
+        transceiver.sender.replaceTrack(null);
+        this._pc.removeTrack(transceiver.sender);
+        this._remoteSdp.closeMediaSection(transceiver.mid);
+        const offer = await this._pc.createOffer();
+        logger.debug('stopSending() | calling pc.setLocalDescription() [offer:%o]', offer);
+        await this._pc.setLocalDescription(offer);
+        const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
+        logger.debug('stopSending() | calling pc.setRemoteDescription() [answer:%o]', answer);
+        await this._pc.setRemoteDescription(answer);
+    }
+    async replaceTrack(localId, track) {
+        this._assertSendDirection();
+        if (track) {
+            logger.debug('replaceTrack() [localId:%s, track.id:%s]', localId, track.id);
+        }
+        else {
+            logger.debug('replaceTrack() [localId:%s, no track]', localId);
+        }
+        const transceiver = this._mapMidTransceiver.get(localId);
+        if (!transceiver)
+            throw new Error('associated RTCRtpTransceiver not found');
+        await transceiver.sender.replaceTrack(track);
+    }
+    async setMaxSpatialLayer(localId, spatialLayer) {
+        this._assertSendDirection();
+        logger.debug('setMaxSpatialLayer() [localId:%s, spatialLayer:%s]', localId, spatialLayer);
+        const transceiver = this._mapMidTransceiver.get(localId);
+        if (!transceiver)
+            throw new Error('associated RTCRtpTransceiver not found');
+        const parameters = transceiver.sender.getParameters();
+        parameters.encodings.forEach((encoding, idx) => {
+            if (idx <= spatialLayer)
+                encoding.active = true;
+            else
+                encoding.active = false;
+        });
+        await transceiver.sender.setParameters(parameters);
+    }
+    async setRtpEncodingParameters(localId, params) {
+        this._assertSendDirection();
+        logger.debug('setRtpEncodingParameters() [localId:%s, params:%o]', localId, params);
+        const transceiver = this._mapMidTransceiver.get(localId);
+        if (!transceiver)
+            throw new Error('associated RTCRtpTransceiver not found');
+        const parameters = transceiver.sender.getParameters();
+        parameters.encodings.forEach((encoding, idx) => {
+            parameters.encodings[idx] = Object.assign(Object.assign({}, encoding), params);
+        });
+        await transceiver.sender.setParameters(parameters);
+    }
+    async getSenderStats(localId) {
+        this._assertSendDirection();
+        const transceiver = this._mapMidTransceiver.get(localId);
+        if (!transceiver)
+            throw new Error('associated RTCRtpTransceiver not found');
+        return transceiver.sender.getStats();
+    }
+    async sendDataChannel({ ordered, maxPacketLifeTime, maxRetransmits, label, protocol }) {
+        this._assertSendDirection();
+        const options = {
+            negotiated: true,
+            id: this._nextSendSctpStreamId,
+            ordered,
+            maxPacketLifeTime,
+            maxRetransmitTime: maxPacketLifeTime,
+            maxRetransmits,
+            protocol
+        };
+        logger.debug('sendDataChannel() [options:%o]', options);
+        const dataChannel = this._pc.createDataChannel(label, options);
+        // Increase next id.
+        this._nextSendSctpStreamId =
+            ++this._nextSendSctpStreamId % SCTP_NUM_STREAMS.MIS;
+        // If this is the first DataChannel we need to create the SDP answer with
+        // m=application section.
+        if (!this._hasDataChannelMediaSection) {
+            const offer = await this._pc.createOffer();
+            const localSdpObject = sdpTransform.parse(offer.sdp);
+            const offerMediaObject = localSdpObject.media
+                .find((m) => m.type === 'application');
+            if (!this._transportReady)
+                await this._setupTransport({ localDtlsRole: 'server', localSdpObject });
+            logger.debug('sendDataChannel() | calling pc.setLocalDescription() [offer:%o]', offer);
+            await this._pc.setLocalDescription(offer);
+            this._remoteSdp.sendSctpAssociation({ offerMediaObject });
+            const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
+            logger.debug('sendDataChannel() | calling pc.setRemoteDescription() [answer:%o]', answer);
+            await this._pc.setRemoteDescription(answer);
+            this._hasDataChannelMediaSection = true;
+        }
+        const sctpStreamParameters = {
+            streamId: options.id,
+            ordered: options.ordered,
+            maxPacketLifeTime: options.maxPacketLifeTime,
+            maxRetransmits: options.maxRetransmits
+        };
+        return { dataChannel, sctpStreamParameters };
+    }
+    async receive({ trackId, kind, rtpParameters }) {
+        this._assertRecvDirection();
+        logger.debug('receive() [trackId:%s, kind:%s]', trackId, kind);
+        const localId = rtpParameters.mid || String(this._mapMidTransceiver.size);
+        this._remoteSdp.receive({
+            mid: localId,
+            kind,
+            offerRtpParameters: rtpParameters,
+            streamId: rtpParameters.rtcp.cname,
+            trackId
+        });
+        const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
+        logger.debug('receive() | calling pc.setRemoteDescription() [offer:%o]', offer);
+        await this._pc.setRemoteDescription(offer);
+        let answer = await this._pc.createAnswer();
+        const localSdpObject = sdpTransform.parse(answer.sdp);
+        const answerMediaObject = localSdpObject.media
+            .find((m) => String(m.mid) === localId);
+        // May need to modify codec parameters in the answer based on codec
+        // parameters in the offer.
+        sdpCommonUtils.applyCodecParameters({
+            offerRtpParameters: rtpParameters,
+            answerMediaObject
+        });
+        answer = { type: 'answer', sdp: sdpTransform.write(localSdpObject) };
+        if (!this._transportReady)
+            await this._setupTransport({ localDtlsRole: 'client', localSdpObject });
+        logger.debug('receive() | calling pc.setLocalDescription() [answer:%o]', answer);
+        await this._pc.setLocalDescription(answer);
+        const transceiver = this._pc.getTransceivers()
+            .find((t) => t.mid === localId);
+        if (!transceiver)
+            throw new Error('new RTCRtpTransceiver not found');
+        // Store in the map.
+        this._mapMidTransceiver.set(localId, transceiver);
+        return {
+            localId,
+            track: transceiver.receiver.track,
+            rtpReceiver: transceiver.receiver
+        };
+    }
+    async stopReceiving(localId) {
+        this._assertRecvDirection();
+        logger.debug('stopReceiving() [localId:%s]', localId);
+        const transceiver = this._mapMidTransceiver.get(localId);
+        if (!transceiver)
+            throw new Error('associated RTCRtpTransceiver not found');
+        this._remoteSdp.closeMediaSection(transceiver.mid);
+        const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
+        logger.debug('stopReceiving() | calling pc.setRemoteDescription() [offer:%o]', offer);
+        await this._pc.setRemoteDescription(offer);
+        const answer = await this._pc.createAnswer();
+        logger.debug('stopReceiving() | calling pc.setLocalDescription() [answer:%o]', answer);
+        await this._pc.setLocalDescription(answer);
+    }
+    async getReceiverStats(localId) {
+        this._assertRecvDirection();
+        const transceiver = this._mapMidTransceiver.get(localId);
+        if (!transceiver)
+            throw new Error('associated RTCRtpTransceiver not found');
+        return transceiver.receiver.getStats();
+    }
+    async receiveDataChannel({ sctpStreamParameters, label, protocol }) {
+        this._assertRecvDirection();
+        const { streamId, ordered, maxPacketLifeTime, maxRetransmits } = sctpStreamParameters;
+        const options = {
+            negotiated: true,
+            id: streamId,
+            ordered,
+            maxPacketLifeTime,
+            maxRetransmitTime: maxPacketLifeTime,
+            maxRetransmits,
+            protocol
+        };
+        logger.debug('receiveDataChannel() [options:%o]', options);
+        const dataChannel = this._pc.createDataChannel(label, options);
+        // If this is the first DataChannel we need to create the SDP offer with
+        // m=application section.
+        if (!this._hasDataChannelMediaSection) {
+            this._remoteSdp.receiveSctpAssociation();
+            const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
+            logger.debug('receiveDataChannel() | calling pc.setRemoteDescription() [offer:%o]', offer);
+            await this._pc.setRemoteDescription(offer);
+            const answer = await this._pc.createAnswer();
+            if (!this._transportReady) {
+                const localSdpObject = sdpTransform.parse(answer.sdp);
+                await this._setupTransport({ localDtlsRole: 'client', localSdpObject });
+            }
+            logger.debug('receiveDataChannel() | calling pc.setRemoteDescription() [answer:%o]', answer);
+            await this._pc.setLocalDescription(answer);
+            this._hasDataChannelMediaSection = true;
+        }
+        return { dataChannel };
+    }
+    async _setupTransport({ localDtlsRole, localSdpObject }) {
+        if (!localSdpObject)
+            localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
+        // Get our local DTLS parameters.
+        const dtlsParameters = sdpCommonUtils.extractDtlsParameters({ sdpObject: localSdpObject });
+        // Set our DTLS role.
+        dtlsParameters.role = localDtlsRole;
+        // Update the remote DTLS role in the SDP.
+        this._remoteSdp.updateDtlsRole(localDtlsRole === 'client' ? 'server' : 'client');
+        // Need to tell the remote transport about our parameters.
+        await this.safeEmitAsPromise('@connect', { dtlsParameters });
+        this._transportReady = true;
+    }
+    _assertSendDirection() {
+        if (this._direction !== 'send') {
+            throw new Error('method can just be called for handlers with "send" direction');
+        }
+    }
+    _assertRecvDirection() {
+        if (this._direction !== 'recv') {
+            throw new Error('method can just be called for handlers with "recv" direction');
+        }
+    }
+}
+exports.Chrome70 = Chrome70;
+
+},{"../Logger":13,"../ortc":36,"../scalabilityModes":37,"../utils":39,"./HandlerInterface":25,"./sdp/RemoteSdp":31,"./sdp/commonUtils":32,"./sdp/unifiedPlanUtils":34,"sdp-transform":44}],22:[function(require,module,exports){
+"use strict";
+var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
+}) : (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    o[k2] = m[k];
+}));
+var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
+    Object.defineProperty(o, "default", { enumerable: true, value: v });
+}) : function(o, v) {
+    o["default"] = v;
+});
+var __importStar = (this && this.__importStar) || function (mod) {
+    if (mod && mod.__esModule) return mod;
+    var result = {};
+    if (mod != null) for (var k in mod) if (k !== "default" && Object.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
+    __setModuleDefault(result, mod);
+    return result;
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.Chrome74 = void 0;
+const sdpTransform = __importStar(require("sdp-transform"));
+const Logger_1 = require("../Logger");
+const utils = __importStar(require("../utils"));
+const ortc = __importStar(require("../ortc"));
+const sdpCommonUtils = __importStar(require("./sdp/commonUtils"));
+const sdpUnifiedPlanUtils = __importStar(require("./sdp/unifiedPlanUtils"));
+const HandlerInterface_1 = require("./HandlerInterface");
+const RemoteSdp_1 = require("./sdp/RemoteSdp");
+const scalabilityModes_1 = require("../scalabilityModes");
+const logger = new Logger_1.Logger('Chrome74');
+const SCTP_NUM_STREAMS = { OS: 1024, MIS: 1024 };
+class Chrome74 extends HandlerInterface_1.HandlerInterface {
+    constructor() {
+        super();
+        // Map of RTCTransceivers indexed by MID.
+        this._mapMidTransceiver = new Map();
+        // Local stream for sending.
+        this._sendStream = new MediaStream();
+        // Whether a DataChannel m=application section has been created.
+        this._hasDataChannelMediaSection = false;
+        // Sending DataChannel id value counter. Incremented for each new DataChannel.
+        this._nextSendSctpStreamId = 0;
+        // Got transport local and remote parameters.
+        this._transportReady = false;
+    }
+    /**
+     * Creates a factory function.
+     */
+    static createFactory() {
+        return () => new Chrome74();
+    }
+    get name() {
+        return 'Chrome74';
+    }
+    close() {
+        logger.debug('close()');
+        // Close RTCPeerConnection.
+        if (this._pc) {
+            try {
+                this._pc.close();
+            }
+            catch (error) { }
+        }
+    }
+    async getNativeRtpCapabilities() {
+        logger.debug('getNativeRtpCapabilities()');
+        const pc = new RTCPeerConnection({
+            iceServers: [],
+            iceTransportPolicy: 'all',
+            bundlePolicy: 'max-bundle',
+            rtcpMuxPolicy: 'require',
+            sdpSemantics: 'unified-plan'
+        });
+        try {
+            pc.addTransceiver('audio');
+            pc.addTransceiver('video');
+            const offer = await pc.createOffer();
+            try {
+                pc.close();
+            }
+            catch (error) { }
+            const sdpObject = sdpTransform.parse(offer.sdp);
+            const nativeRtpCapabilities = sdpCommonUtils.extractRtpCapabilities({ sdpObject });
+            return nativeRtpCapabilities;
+        }
+        catch (error) {
+            try {
+                pc.close();
+            }
+            catch (error2) { }
+            throw error;
+        }
+    }
+    async getNativeSctpCapabilities() {
+        logger.debug('getNativeSctpCapabilities()');
+        return {
+            numStreams: SCTP_NUM_STREAMS
+        };
+    }
+    run({ direction, iceParameters, iceCandidates, dtlsParameters, sctpParameters, iceServers, iceTransportPolicy, additionalSettings, proprietaryConstraints, extendedRtpCapabilities }) {
+        logger.debug('run()');
+        this._direction = direction;
+        this._remoteSdp = new RemoteSdp_1.RemoteSdp({
+            iceParameters,
+            iceCandidates,
+            dtlsParameters,
+            sctpParameters
+        });
+        this._sendingRtpParametersByKind =
             {
-                '../Logger': 12,
-                '../ortc': 33,
-                '../utils': 36,
-                './HandlerInterface': 22,
-                './sdp/RemoteSdp': 28,
-                './sdp/commonUtils': 29,
-                './sdp/planBUtils': 30,
-                'sdp-transform': 41,
-            },
-        ],
-        25: [
-            function (require, module, exports) {
-                'use strict';
-                Object.defineProperty(exports, '__esModule', { value: true });
-                const sdpTransform = require('sdp-transform');
-                const Logger_1 = require('../Logger');
-                const utils = require('../utils');
-                const ortc = require('../ortc');
-                const sdpCommonUtils = require('./sdp/commonUtils');
-                const sdpUnifiedPlanUtils = require('./sdp/unifiedPlanUtils');
-                const HandlerInterface_1 = require('./HandlerInterface');
-                const RemoteSdp_1 = require('./sdp/RemoteSdp');
-                const logger = new Logger_1.Logger('Safari12');
-                const SCTP_NUM_STREAMS = { OS: 1024, MIS: 1024 };
-                class Safari12 extends HandlerInterface_1.HandlerInterface {
-                    constructor() {
-                        super();
-                        // Map of RTCTransceivers indexed by MID.
-                        this._mapMidTransceiver = new Map();
-                        // Local stream for sending.
-                        this._sendStream = new MediaStream();
-                        // Whether a DataChannel m=application section has been created.
-                        this._hasDataChannelMediaSection = false;
-                        // Sending DataChannel id value counter. Incremented for each new DataChannel.
-                        this._nextSendSctpStreamId = 0;
-                        // Got transport local and remote parameters.
-                        this._transportReady = false;
-                    }
-                    /**
-                     * Creates a factory function.
-                     */
-                    static createFactory() {
-                        return () => new Safari12();
-                    }
-                    get name() {
-                        return 'Safari12';
-                    }
-                    close() {
-                        logger.debug('close()');
-                        // Close RTCPeerConnection.
-                        if (this._pc) {
-                            try {
-                                this._pc.close();
-                            } catch (error) {}
-                        }
-                    }
-                    async getNativeRtpCapabilities() {
-                        logger.debug('getNativeRtpCapabilities()');
-                        const pc = new RTCPeerConnection({
-                            iceServers: [],
-                            iceTransportPolicy: 'all',
-                            bundlePolicy: 'max-bundle',
-                            rtcpMuxPolicy: 'require',
-                        });
-                        try {
-                            pc.addTransceiver('audio');
-                            pc.addTransceiver('video');
-                            const offer = await pc.createOffer();
-                            try {
-                                pc.close();
-                            } catch (error) {}
-                            const sdpObject = sdpTransform.parse(offer.sdp);
-                            const nativeRtpCapabilities = sdpCommonUtils.extractRtpCapabilities({ sdpObject });
-                            return nativeRtpCapabilities;
-                        } catch (error) {
-                            try {
-                                pc.close();
-                            } catch (error2) {}
-                            throw error;
-                        }
-                    }
-                    async getNativeSctpCapabilities() {
-                        logger.debug('getNativeSctpCapabilities()');
-                        return {
-                            numStreams: SCTP_NUM_STREAMS,
-                        };
-                    }
-                    run({
-                        direction,
-                        iceParameters,
-                        iceCandidates,
-                        dtlsParameters,
-                        sctpParameters,
-                        iceServers,
-                        iceTransportPolicy,
-                        additionalSettings,
-                        proprietaryConstraints,
-                        extendedRtpCapabilities,
-                    }) {
-                        logger.debug('run()');
-                        this._direction = direction;
-                        this._remoteSdp = new RemoteSdp_1.RemoteSdp({
-                            iceParameters,
-                            iceCandidates,
-                            dtlsParameters,
-                            sctpParameters,
-                        });
-                        this._sendingRtpParametersByKind = {
-                            audio: ortc.getSendingRtpParameters('audio', extendedRtpCapabilities),
-                            video: ortc.getSendingRtpParameters('video', extendedRtpCapabilities),
-                        };
-                        this._sendingRemoteRtpParametersByKind = {
-                            audio: ortc.getSendingRemoteRtpParameters('audio', extendedRtpCapabilities),
-                            video: ortc.getSendingRemoteRtpParameters('video', extendedRtpCapabilities),
-                        };
-                        this._pc = new RTCPeerConnection(
-                            {
-                                iceServers: iceServers || [],
-                                iceTransportPolicy: iceTransportPolicy || 'all',
-                                bundlePolicy: 'max-bundle',
-                                rtcpMuxPolicy: 'require',
-                                ...additionalSettings,
-                            },
-                            proprietaryConstraints,
-                        );
-                        // Handle RTCPeerConnection connection status.
-                        this._pc.addEventListener('iceconnectionstatechange', () => {
-                            switch (this._pc.iceConnectionState) {
-                                case 'checking':
-                                    this.emit('@connectionstatechange', 'connecting');
-                                    break;
-                                case 'connected':
-                                case 'completed':
-                                    this.emit('@connectionstatechange', 'connected');
-                                    break;
-                                case 'failed':
-                                    this.emit('@connectionstatechange', 'failed');
-                                    break;
-                                case 'disconnected':
-                                    this.emit('@connectionstatechange', 'disconnected');
-                                    break;
-                                case 'closed':
-                                    this.emit('@connectionstatechange', 'closed');
-                                    break;
-                            }
-                        });
-                    }
-                    async updateIceServers(iceServers) {
-                        logger.debug('updateIceServers()');
-                        const configuration = this._pc.getConfiguration();
-                        configuration.iceServers = iceServers;
-                        this._pc.setConfiguration(configuration);
-                    }
-                    async restartIce(iceParameters) {
-                        logger.debug('restartIce()');
-                        // Provide the remote SDP handler with new remote ICE parameters.
-                        this._remoteSdp.updateIceParameters(iceParameters);
-                        if (!this._transportReady) return;
-                        if (this._direction === 'send') {
-                            const offer = await this._pc.createOffer({ iceRestart: true });
-                            logger.debug('restartIce() | calling pc.setLocalDescription() [offer:%o]', offer);
-                            await this._pc.setLocalDescription(offer);
-                            const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
-                            logger.debug('restartIce() | calling pc.setRemoteDescription() [answer:%o]', answer);
-                            await this._pc.setRemoteDescription(answer);
-                        } else {
-                            const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
-                            logger.debug('restartIce() | calling pc.setRemoteDescription() [offer:%o]', offer);
-                            await this._pc.setRemoteDescription(offer);
-                            const answer = await this._pc.createAnswer();
-                            logger.debug('restartIce() | calling pc.setLocalDescription() [answer:%o]', answer);
-                            await this._pc.setLocalDescription(answer);
-                        }
-                    }
-                    async getTransportStats() {
-                        return this._pc.getStats();
-                    }
-                    async send({ track, encodings, codecOptions, codec }) {
-                        this._assertSendDirection();
-                        logger.debug('send() [kind:%s, track.id:%s]', track.kind, track.id);
-                        const sendingRtpParameters = utils.clone(this._sendingRtpParametersByKind[track.kind]);
-                        // This may throw.
-                        sendingRtpParameters.codecs = ortc.reduceCodecs(sendingRtpParameters.codecs, codec);
-                        const sendingRemoteRtpParameters = utils.clone(
-                            this._sendingRemoteRtpParametersByKind[track.kind],
-                        );
-                        // This may throw.
-                        sendingRemoteRtpParameters.codecs = ortc.reduceCodecs(sendingRemoteRtpParameters.codecs, codec);
-                        const mediaSectionIdx = this._remoteSdp.getNextMediaSectionIdx();
-                        const transceiver = this._pc.addTransceiver(track, {
-                            direction: 'sendonly',
-                            streams: [this._sendStream],
-                        });
-                        let offer = await this._pc.createOffer();
-                        let localSdpObject = sdpTransform.parse(offer.sdp);
-                        let offerMediaObject;
-                        if (!this._transportReady)
-                            await this._setupTransport({ localDtlsRole: 'server', localSdpObject });
-                        if (encodings && encodings.length > 1) {
-                            logger.debug('send() | enabling legacy simulcast');
-                            localSdpObject = sdpTransform.parse(offer.sdp);
-                            offerMediaObject = localSdpObject.media[mediaSectionIdx.idx];
-                            sdpUnifiedPlanUtils.addLegacySimulcast({
-                                offerMediaObject,
-                                numStreams: encodings.length,
-                            });
-                            offer = { type: 'offer', sdp: sdpTransform.write(localSdpObject) };
-                        }
-                        logger.debug('send() | calling pc.setLocalDescription() [offer:%o]', offer);
-                        await this._pc.setLocalDescription(offer);
-                        // We can now get the transceiver.mid.
-                        const localId = transceiver.mid;
-                        // Set MID.
-                        sendingRtpParameters.mid = localId;
-                        localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
-                        offerMediaObject = localSdpObject.media[mediaSectionIdx.idx];
-                        // Set RTCP CNAME.
-                        sendingRtpParameters.rtcp.cname = sdpCommonUtils.getCname({ offerMediaObject });
-                        // Set RTP encodings.
-                        sendingRtpParameters.encodings = sdpUnifiedPlanUtils.getRtpEncodings({ offerMediaObject });
-                        // Complete encodings with given values.
-                        if (encodings) {
-                            for (let idx = 0; idx < sendingRtpParameters.encodings.length; ++idx) {
-                                if (encodings[idx]) Object.assign(sendingRtpParameters.encodings[idx], encodings[idx]);
-                            }
-                        }
-                        // If VP8 or H264 and there is effective simulcast, add scalabilityMode to
-                        // each encoding.
-                        if (
-                            sendingRtpParameters.encodings.length > 1 &&
-                            (sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/vp8' ||
-                                sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/h264')
-                        ) {
-                            for (const encoding of sendingRtpParameters.encodings) {
-                                encoding.scalabilityMode = 'S1T3';
-                            }
-                        }
-                        this._remoteSdp.send({
-                            offerMediaObject,
-                            reuseMid: mediaSectionIdx.reuseMid,
-                            offerRtpParameters: sendingRtpParameters,
-                            answerRtpParameters: sendingRemoteRtpParameters,
-                            codecOptions,
-                        });
-                        const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
-                        logger.debug('send() | calling pc.setRemoteDescription() [answer:%o]', answer);
-                        await this._pc.setRemoteDescription(answer);
-                        // Store in the map.
-                        this._mapMidTransceiver.set(localId, transceiver);
-                        return {
-                            localId,
-                            rtpParameters: sendingRtpParameters,
-                            rtpSender: transceiver.sender,
-                        };
-                    }
-                    async stopSending(localId) {
-                        this._assertSendDirection();
-                        logger.debug('stopSending() [localId:%s]', localId);
-                        const transceiver = this._mapMidTransceiver.get(localId);
-                        if (!transceiver) throw new Error('associated RTCRtpTransceiver not found');
-                        transceiver.sender.replaceTrack(null);
-                        this._pc.removeTrack(transceiver.sender);
-                        this._remoteSdp.closeMediaSection(transceiver.mid);
-                        const offer = await this._pc.createOffer();
-                        logger.debug('stopSending() | calling pc.setLocalDescription() [offer:%o]', offer);
-                        await this._pc.setLocalDescription(offer);
-                        const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
-                        logger.debug('stopSending() | calling pc.setRemoteDescription() [answer:%o]', answer);
-                        await this._pc.setRemoteDescription(answer);
-                    }
-                    async replaceTrack(localId, track) {
-                        this._assertSendDirection();
-                        if (track) {
-                            logger.debug('replaceTrack() [localId:%s, track.id:%s]', localId, track.id);
-                        } else {
-                            logger.debug('replaceTrack() [localId:%s, no track]', localId);
-                        }
-                        const transceiver = this._mapMidTransceiver.get(localId);
-                        if (!transceiver) throw new Error('associated RTCRtpTransceiver not found');
-                        await transceiver.sender.replaceTrack(track);
-                    }
-                    async setMaxSpatialLayer(localId, spatialLayer) {
-                        this._assertSendDirection();
-                        logger.debug('setMaxSpatialLayer() [localId:%s, spatialLayer:%s]', localId, spatialLayer);
-                        const transceiver = this._mapMidTransceiver.get(localId);
-                        if (!transceiver) throw new Error('associated RTCRtpTransceiver not found');
-                        const parameters = transceiver.sender.getParameters();
-                        parameters.encodings.forEach((encoding, idx) => {
-                            if (idx <= spatialLayer) encoding.active = true;
-                            else encoding.active = false;
-                        });
-                        await transceiver.sender.setParameters(parameters);
-                    }
-                    async setRtpEncodingParameters(localId, params) {
-                        this._assertSendDirection();
-                        logger.debug('setRtpEncodingParameters() [localId:%s, params:%o]', localId, params);
-                        const transceiver = this._mapMidTransceiver.get(localId);
-                        if (!transceiver) throw new Error('associated RTCRtpTransceiver not found');
-                        const parameters = transceiver.sender.getParameters();
-                        parameters.encodings.forEach((encoding, idx) => {
-                            parameters.encodings[idx] = { ...encoding, ...params };
-                        });
-                        await transceiver.sender.setParameters(parameters);
-                    }
-                    async getSenderStats(localId) {
-                        this._assertSendDirection();
-                        const transceiver = this._mapMidTransceiver.get(localId);
-                        if (!transceiver) throw new Error('associated RTCRtpTransceiver not found');
-                        return transceiver.sender.getStats();
-                    }
-                    async sendDataChannel({ ordered, maxPacketLifeTime, maxRetransmits, label, protocol, priority }) {
-                        this._assertSendDirection();
-                        const options = {
-                            negotiated: true,
-                            id: this._nextSendSctpStreamId,
-                            ordered,
-                            maxPacketLifeTime,
-                            maxRetransmits,
-                            protocol,
-                            priority,
-                        };
-                        logger.debug('sendDataChannel() [options:%o]', options);
-                        const dataChannel = this._pc.createDataChannel(label, options);
-                        // Increase next id.
-                        this._nextSendSctpStreamId = ++this._nextSendSctpStreamId % SCTP_NUM_STREAMS.MIS;
-                        // If this is the first DataChannel we need to create the SDP answer with
-                        // m=application section.
-                        if (!this._hasDataChannelMediaSection) {
-                            const offer = await this._pc.createOffer();
-                            const localSdpObject = sdpTransform.parse(offer.sdp);
-                            const offerMediaObject = localSdpObject.media.find((m) => m.type === 'application');
-                            if (!this._transportReady)
-                                await this._setupTransport({ localDtlsRole: 'server', localSdpObject });
-                            logger.debug('sendDataChannel() | calling pc.setLocalDescription() [offer:%o]', offer);
-                            await this._pc.setLocalDescription(offer);
-                            this._remoteSdp.sendSctpAssociation({ offerMediaObject });
-                            const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
-                            logger.debug('sendDataChannel() | calling pc.setRemoteDescription() [answer:%o]', answer);
-                            await this._pc.setRemoteDescription(answer);
-                            this._hasDataChannelMediaSection = true;
-                        }
-                        const sctpStreamParameters = {
-                            streamId: options.id,
-                            ordered: options.ordered,
-                            maxPacketLifeTime: options.maxPacketLifeTime,
-                            maxRetransmits: options.maxRetransmits,
-                        };
-                        return { dataChannel, sctpStreamParameters };
-                    }
-                    async receive({ trackId, kind, rtpParameters }) {
-                        this._assertRecvDirection();
-                        logger.debug('receive() [trackId:%s, kind:%s]', trackId, kind);
-                        const localId = rtpParameters.mid || String(this._mapMidTransceiver.size);
-                        this._remoteSdp.receive({
-                            mid: localId,
-                            kind,
-                            offerRtpParameters: rtpParameters,
-                            streamId: rtpParameters.rtcp.cname,
-                            trackId,
-                        });
-                        const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
-                        logger.debug('receive() | calling pc.setRemoteDescription() [offer:%o]', offer);
-                        await this._pc.setRemoteDescription(offer);
-                        let answer = await this._pc.createAnswer();
-                        const localSdpObject = sdpTransform.parse(answer.sdp);
-                        const answerMediaObject = localSdpObject.media.find((m) => String(m.mid) === localId);
-                        // May need to modify codec parameters in the answer based on codec
-                        // parameters in the offer.
-                        sdpCommonUtils.applyCodecParameters({
-                            offerRtpParameters: rtpParameters,
-                            answerMediaObject,
-                        });
-                        answer = { type: 'answer', sdp: sdpTransform.write(localSdpObject) };
-                        if (!this._transportReady)
-                            await this._setupTransport({ localDtlsRole: 'client', localSdpObject });
-                        logger.debug('receive() | calling pc.setLocalDescription() [answer:%o]', answer);
-                        await this._pc.setLocalDescription(answer);
-                        const transceiver = this._pc.getTransceivers().find((t) => t.mid === localId);
-                        if (!transceiver) throw new Error('new RTCRtpTransceiver not found');
-                        // Store in the map.
-                        this._mapMidTransceiver.set(localId, transceiver);
-                        return {
-                            localId,
-                            track: transceiver.receiver.track,
-                            rtpReceiver: transceiver.receiver,
-                        };
-                    }
-                    async stopReceiving(localId) {
-                        this._assertRecvDirection();
-                        logger.debug('stopReceiving() [localId:%s]', localId);
-                        const transceiver = this._mapMidTransceiver.get(localId);
-                        if (!transceiver) throw new Error('associated RTCRtpTransceiver not found');
-                        this._remoteSdp.closeMediaSection(transceiver.mid);
-                        const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
-                        logger.debug('stopReceiving() | calling pc.setRemoteDescription() [offer:%o]', offer);
-                        await this._pc.setRemoteDescription(offer);
-                        const answer = await this._pc.createAnswer();
-                        logger.debug('stopReceiving() | calling pc.setLocalDescription() [answer:%o]', answer);
-                        await this._pc.setLocalDescription(answer);
-                    }
-                    async getReceiverStats(localId) {
-                        this._assertRecvDirection();
-                        const transceiver = this._mapMidTransceiver.get(localId);
-                        if (!transceiver) throw new Error('associated RTCRtpTransceiver not found');
-                        return transceiver.receiver.getStats();
-                    }
-                    async receiveDataChannel({ sctpStreamParameters, label, protocol }) {
-                        this._assertRecvDirection();
-                        const { streamId, ordered, maxPacketLifeTime, maxRetransmits } = sctpStreamParameters;
-                        const options = {
-                            negotiated: true,
-                            id: streamId,
-                            ordered,
-                            maxPacketLifeTime,
-                            maxRetransmits,
-                            protocol,
-                        };
-                        logger.debug('receiveDataChannel() [options:%o]', options);
-                        const dataChannel = this._pc.createDataChannel(label, options);
-                        // If this is the first DataChannel we need to create the SDP offer with
-                        // m=application section.
-                        if (!this._hasDataChannelMediaSection) {
-                            this._remoteSdp.receiveSctpAssociation();
-                            const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
-                            logger.debug('receiveDataChannel() | calling pc.setRemoteDescription() [offer:%o]', offer);
-                            await this._pc.setRemoteDescription(offer);
-                            const answer = await this._pc.createAnswer();
-                            if (!this._transportReady) {
-                                const localSdpObject = sdpTransform.parse(answer.sdp);
-                                await this._setupTransport({ localDtlsRole: 'client', localSdpObject });
-                            }
-                            logger.debug(
-                                'receiveDataChannel() | calling pc.setRemoteDescription() [answer:%o]',
-                                answer,
-                            );
-                            await this._pc.setLocalDescription(answer);
-                            this._hasDataChannelMediaSection = true;
-                        }
-                        return { dataChannel };
-                    }
-                    async _setupTransport({ localDtlsRole, localSdpObject }) {
-                        if (!localSdpObject) localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
-                        // Get our local DTLS parameters.
-                        const dtlsParameters = sdpCommonUtils.extractDtlsParameters({ sdpObject: localSdpObject });
-                        // Set our DTLS role.
-                        dtlsParameters.role = localDtlsRole;
-                        // Update the remote DTLS role in the SDP.
-                        this._remoteSdp.updateDtlsRole(localDtlsRole === 'client' ? 'server' : 'client');
-                        // Need to tell the remote transport about our parameters.
-                        await this.safeEmitAsPromise('@connect', { dtlsParameters });
-                        this._transportReady = true;
-                    }
-                    _assertSendDirection() {
-                        if (this._direction !== 'send') {
-                            throw new Error('method can just be called for handlers with "send" direction');
-                        }
-                    }
-                    _assertRecvDirection() {
-                        if (this._direction !== 'recv') {
-                            throw new Error('method can just be called for handlers with "recv" direction');
-                        }
-                    }
-                }
-                exports.Safari12 = Safari12;
-            },
+                audio: ortc.getSendingRtpParameters('audio', extendedRtpCapabilities),
+                video: ortc.getSendingRtpParameters('video', extendedRtpCapabilities)
+            };
+        this._sendingRemoteRtpParametersByKind =
             {
-                '../Logger': 12,
-                '../ortc': 33,
-                '../utils': 36,
-                './HandlerInterface': 22,
-                './sdp/RemoteSdp': 28,
-                './sdp/commonUtils': 29,
-                './sdp/unifiedPlanUtils': 31,
-                'sdp-transform': 41,
-            },
-        ],
-        26: [
-            function (require, module, exports) {
-                'use strict';
-                Object.defineProperty(exports, '__esModule', { value: true });
-                const utils = require('../../utils');
-                /**
-                 * Normalize ORTC based Edge's RTCRtpReceiver.getCapabilities() to produce a full
-                 * compliant ORTC RTCRtpCapabilities.
-                 */
-                function getCapabilities() {
-                    const nativeCaps = RTCRtpReceiver.getCapabilities();
-                    const caps = utils.clone(nativeCaps);
-                    for (const codec of caps.codecs) {
-                        // Rename numChannels to channels.
-                        codec.channels = codec.numChannels;
-                        delete codec.numChannels;
-                        // Add mimeType.
-                        codec.mimeType = codec.mimeType || `${codec.kind}/${codec.name}`;
-                        // NOTE: Edge sets some numeric parameters as string rather than number. Fix them.
-                        if (codec.parameters) {
-                            const parameters = codec.parameters;
-                            if (parameters.apt) parameters.apt = Number(parameters.apt);
-                            if (parameters['packetization-mode'])
-                                parameters['packetization-mode'] = Number(parameters['packetization-mode']);
-                        }
-                        // Delete emty parameter String in rtcpFeedback.
-                        for (const feedback of codec.rtcpFeedback || []) {
-                            if (!feedback.parameter) feedback.parameter = '';
-                        }
-                    }
-                    return caps;
-                }
-                exports.getCapabilities = getCapabilities;
-                /**
-                 * Generate RTCRtpParameters as ORTC based Edge likes.
-                 */
-                function mangleRtpParameters(rtpParameters) {
-                    const params = utils.clone(rtpParameters);
-                    // Rename mid to muxId.
-                    if (params.mid) {
-                        params.muxId = params.mid;
-                        delete params.mid;
-                    }
-                    for (const codec of params.codecs) {
-                        // Rename channels to numChannels.
-                        if (codec.channels) {
-                            codec.numChannels = codec.channels;
-                            delete codec.channels;
-                        }
-                        // Add codec.name (requried by Edge).
-                        if (codec.mimeType && !codec.name) codec.name = codec.mimeType.split('/')[1];
-                        // Remove mimeType.
-                        delete codec.mimeType;
-                    }
-                    return params;
-                }
-                exports.mangleRtpParameters = mangleRtpParameters;
-            },
-            { '../../utils': 36 },
-        ],
-        27: [
-            function (require, module, exports) {
-                'use strict';
-                Object.defineProperty(exports, '__esModule', { value: true });
-                const utils = require('../../utils');
-                class MediaSection {
-                    constructor({ iceParameters, iceCandidates, dtlsParameters, planB = false }) {
-                        this._mediaObject = {};
-                        this._planB = planB;
-                        if (iceParameters) {
-                            this.setIceParameters(iceParameters);
-                        }
-                        if (iceCandidates) {
-                            this._mediaObject.candidates = [];
-                            for (const candidate of iceCandidates) {
-                                const candidateObject = {};
-                                // mediasoup does mandates rtcp-mux so candidates component is always
-                                // RTP (1).
-                                candidateObject.component = 1;
-                                candidateObject.foundation = candidate.foundation;
-                                candidateObject.ip = candidate.ip;
-                                candidateObject.port = candidate.port;
-                                candidateObject.priority = candidate.priority;
-                                candidateObject.transport = candidate.protocol;
-                                candidateObject.type = candidate.type;
-                                if (candidate.tcpType) candidateObject.tcptype = candidate.tcpType;
-                                this._mediaObject.candidates.push(candidateObject);
-                            }
-                            this._mediaObject.endOfCandidates = 'end-of-candidates';
-                            this._mediaObject.iceOptions = 'renomination';
-                        }
-                        if (dtlsParameters) {
-                            this.setDtlsRole(dtlsParameters.role);
-                        }
-                    }
-                    get mid() {
-                        return String(this._mediaObject.mid);
-                    }
-                    get closed() {
-                        return this._mediaObject.port === 0;
-                    }
-                    getObject() {
-                        return this._mediaObject;
-                    }
-                    setIceParameters(iceParameters) {
-                        this._mediaObject.iceUfrag = iceParameters.usernameFragment;
-                        this._mediaObject.icePwd = iceParameters.password;
-                    }
-                    disable() {
-                        this._mediaObject.direction = 'inactive';
-                        delete this._mediaObject.ext;
-                        delete this._mediaObject.ssrcs;
-                        delete this._mediaObject.ssrcGroups;
-                        delete this._mediaObject.simulcast;
-                        delete this._mediaObject.simulcast_03;
-                        delete this._mediaObject.rids;
-                    }
-                    close() {
-                        this._mediaObject.direction = 'inactive';
-                        this._mediaObject.port = 0;
-                        delete this._mediaObject.ext;
-                        delete this._mediaObject.ssrcs;
-                        delete this._mediaObject.ssrcGroups;
-                        delete this._mediaObject.simulcast;
-                        delete this._mediaObject.simulcast_03;
-                        delete this._mediaObject.rids;
-                        delete this._mediaObject.extmapAllowMixed;
-                    }
-                }
-                exports.MediaSection = MediaSection;
-                class AnswerMediaSection extends MediaSection {
-                    constructor({
-                        iceParameters,
-                        iceCandidates,
-                        dtlsParameters,
-                        sctpParameters,
-                        plainRtpParameters,
-                        planB = false,
-                        offerMediaObject,
-                        offerRtpParameters,
-                        answerRtpParameters,
-                        codecOptions,
-                        extmapAllowMixed = false,
-                    }) {
-                        super({ iceParameters, iceCandidates, dtlsParameters, planB });
-                        this._mediaObject.mid = String(offerMediaObject.mid);
-                        this._mediaObject.type = offerMediaObject.type;
-                        this._mediaObject.protocol = offerMediaObject.protocol;
-                        if (!plainRtpParameters) {
-                            this._mediaObject.connection = { ip: '127.0.0.1', version: 4 };
-                            this._mediaObject.port = 7;
-                        } else {
-                            this._mediaObject.connection = {
-                                ip: plainRtpParameters.ip,
-                                version: plainRtpParameters.ipVersion,
-                            };
-                            this._mediaObject.port = plainRtpParameters.port;
-                        }
-                        switch (offerMediaObject.type) {
-                            case 'audio':
-                            case 'video': {
-                                this._mediaObject.direction = 'recvonly';
-                                this._mediaObject.rtp = [];
-                                this._mediaObject.rtcpFb = [];
-                                this._mediaObject.fmtp = [];
-                                for (const codec of answerRtpParameters.codecs) {
-                                    const rtp = {
-                                        payload: codec.payloadType,
-                                        codec: getCodecName(codec),
-                                        rate: codec.clockRate,
-                                    };
-                                    if (codec.channels > 1) rtp.encoding = codec.channels;
-                                    this._mediaObject.rtp.push(rtp);
-                                    const codecParameters = utils.clone(codec.parameters || {});
-                                    if (codecOptions) {
-                                        const {
-                                            opusStereo,
-                                            opusFec,
-                                            opusDtx,
-                                            opusMaxPlaybackRate,
-                                            opusPtime,
-                                            videoGoogleStartBitrate,
-                                            videoGoogleMaxBitrate,
-                                            videoGoogleMinBitrate,
-                                        } = codecOptions;
-                                        const offerCodec = offerRtpParameters.codecs.find(
-                                            (c) => c.payloadType === codec.payloadType,
-                                        );
-                                        switch (codec.mimeType.toLowerCase()) {
-                                            case 'audio/opus': {
-                                                if (opusStereo !== undefined) {
-                                                    offerCodec.parameters['sprop-stereo'] = opusStereo ? 1 : 0;
-                                                    codecParameters.stereo = opusStereo ? 1 : 0;
-                                                }
-                                                if (opusFec !== undefined) {
-                                                    offerCodec.parameters.useinbandfec = opusFec ? 1 : 0;
-                                                    codecParameters.useinbandfec = opusFec ? 1 : 0;
-                                                }
-                                                if (opusDtx !== undefined) {
-                                                    offerCodec.parameters.usedtx = opusDtx ? 1 : 0;
-                                                    codecParameters.usedtx = opusDtx ? 1 : 0;
-                                                }
-                                                if (opusMaxPlaybackRate !== undefined) {
-                                                    codecParameters.maxplaybackrate = opusMaxPlaybackRate;
-                                                }
-                                                if (opusPtime !== undefined) {
-                                                    offerCodec.parameters.ptime = opusPtime;
-                                                    codecParameters.ptime = opusPtime;
-                                                }
-                                                break;
-                                            }
-                                            case 'video/vp8':
-                                            case 'video/vp9':
-                                            case 'video/h264':
-                                            case 'video/h265': {
-                                                if (videoGoogleStartBitrate !== undefined)
-                                                    codecParameters['x-google-start-bitrate'] = videoGoogleStartBitrate;
-                                                if (videoGoogleMaxBitrate !== undefined)
-                                                    codecParameters['x-google-max-bitrate'] = videoGoogleMaxBitrate;
-                                                if (videoGoogleMinBitrate !== undefined)
-                                                    codecParameters['x-google-min-bitrate'] = videoGoogleMinBitrate;
-                                                break;
-                                            }
-                                        }
-                                    }
-                                    const fmtp = {
-                                        payload: codec.payloadType,
-                                        config: '',
-                                    };
-                                    for (const key of Object.keys(codecParameters)) {
-                                        if (fmtp.config) fmtp.config += ';';
-                                        fmtp.config += `${key}=${codecParameters[key]}`;
-                                    }
-                                    if (fmtp.config) this._mediaObject.fmtp.push(fmtp);
-                                    for (const fb of codec.rtcpFeedback) {
-                                        this._mediaObject.rtcpFb.push({
-                                            payload: codec.payloadType,
-                                            type: fb.type,
-                                            subtype: fb.parameter,
-                                        });
-                                    }
-                                }
-                                this._mediaObject.payloads = answerRtpParameters.codecs
-                                    .map((codec) => codec.payloadType)
-                                    .join(' ');
-                                this._mediaObject.ext = [];
-                                for (const ext of answerRtpParameters.headerExtensions) {
-                                    // Don't add a header extension if not present in the offer.
-                                    const found = (offerMediaObject.ext || []).some(
-                                        (localExt) => localExt.uri === ext.uri,
-                                    );
-                                    if (!found) continue;
-                                    this._mediaObject.ext.push({
-                                        uri: ext.uri,
-                                        value: ext.id,
-                                    });
-                                }
-                                // Allow both 1 byte and 2 bytes length header extensions.
-                                if (extmapAllowMixed && offerMediaObject.extmapAllowMixed === 'extmap-allow-mixed') {
-                                    this._mediaObject.extmapAllowMixed = 'extmap-allow-mixed';
-                                }
-                                // Simulcast.
-                                if (offerMediaObject.simulcast) {
-                                    this._mediaObject.simulcast = {
-                                        dir1: 'recv',
-                                        list1: offerMediaObject.simulcast.list1,
-                                    };
-                                    this._mediaObject.rids = [];
-                                    for (const rid of offerMediaObject.rids || []) {
-                                        if (rid.direction !== 'send') continue;
-                                        this._mediaObject.rids.push({
-                                            id: rid.id,
-                                            direction: 'recv',
-                                        });
-                                    }
-                                }
-                                // Simulcast (draft version 03).
-                                else if (offerMediaObject.simulcast_03) {
-                                    // eslint-disable-next-line camelcase
-                                    this._mediaObject.simulcast_03 = {
-                                        value: offerMediaObject.simulcast_03.value.replace(/send/g, 'recv'),
-                                    };
-                                    this._mediaObject.rids = [];
-                                    for (const rid of offerMediaObject.rids || []) {
-                                        if (rid.direction !== 'send') continue;
-                                        this._mediaObject.rids.push({
-                                            id: rid.id,
-                                            direction: 'recv',
-                                        });
-                                    }
-                                }
-                                this._mediaObject.rtcpMux = 'rtcp-mux';
-                                this._mediaObject.rtcpRsize = 'rtcp-rsize';
-                                if (this._planB && this._mediaObject.type === 'video')
-                                    this._mediaObject.xGoogleFlag = 'conference';
-                                break;
-                            }
-                            case 'application': {
-                                // New spec.
-                                if (typeof offerMediaObject.sctpPort === 'number') {
-                                    this._mediaObject.payloads = 'webrtc-datachannel';
-                                    this._mediaObject.sctpPort = sctpParameters.port;
-                                    this._mediaObject.maxMessageSize = sctpParameters.maxMessageSize;
-                                }
-                                // Old spec.
-                                else if (offerMediaObject.sctpmap) {
-                                    this._mediaObject.payloads = sctpParameters.port;
-                                    this._mediaObject.sctpmap = {
-                                        app: 'webrtc-datachannel',
-                                        sctpmapNumber: sctpParameters.port,
-                                        maxMessageSize: sctpParameters.maxMessageSize,
-                                    };
-                                }
-                                break;
-                            }
-                        }
-                    }
-                    setDtlsRole(role) {
-                        switch (role) {
-                            case 'client':
-                                this._mediaObject.setup = 'active';
-                                break;
-                            case 'server':
-                                this._mediaObject.setup = 'passive';
-                                break;
-                            case 'auto':
-                                this._mediaObject.setup = 'actpass';
-                                break;
-                        }
-                    }
-                }
-                exports.AnswerMediaSection = AnswerMediaSection;
-                class OfferMediaSection extends MediaSection {
-                    constructor({
-                        iceParameters,
-                        iceCandidates,
-                        dtlsParameters,
-                        sctpParameters,
-                        plainRtpParameters,
-                        planB = false,
-                        mid,
-                        kind,
-                        offerRtpParameters,
-                        streamId,
-                        trackId,
-                        oldDataChannelSpec = false,
-                    }) {
-                        super({ iceParameters, iceCandidates, dtlsParameters, planB });
-                        this._mediaObject.mid = String(mid);
-                        this._mediaObject.type = kind;
-                        if (!plainRtpParameters) {
-                            this._mediaObject.connection = { ip: '127.0.0.1', version: 4 };
-                            if (!sctpParameters) this._mediaObject.protocol = 'UDP/TLS/RTP/SAVPF';
-                            else this._mediaObject.protocol = 'UDP/DTLS/SCTP';
-                            this._mediaObject.port = 7;
-                        } else {
-                            this._mediaObject.connection = {
-                                ip: plainRtpParameters.ip,
-                                version: plainRtpParameters.ipVersion,
-                            };
-                            this._mediaObject.protocol = 'RTP/AVP';
-                            this._mediaObject.port = plainRtpParameters.port;
-                        }
-                        switch (kind) {
-                            case 'audio':
-                            case 'video': {
-                                this._mediaObject.direction = 'sendonly';
-                                this._mediaObject.rtp = [];
-                                this._mediaObject.rtcpFb = [];
-                                this._mediaObject.fmtp = [];
-                                if (!this._planB) this._mediaObject.msid = `${streamId || '-'} ${trackId}`;
-                                for (const codec of offerRtpParameters.codecs) {
-                                    const rtp = {
-                                        payload: codec.payloadType,
-                                        codec: getCodecName(codec),
-                                        rate: codec.clockRate,
-                                    };
-                                    if (codec.channels > 1) rtp.encoding = codec.channels;
-                                    this._mediaObject.rtp.push(rtp);
-                                    const fmtp = {
-                                        payload: codec.payloadType,
-                                        config: '',
-                                    };
-                                    for (const key of Object.keys(codec.parameters)) {
-                                        if (fmtp.config) fmtp.config += ';';
-                                        fmtp.config += `${key}=${codec.parameters[key]}`;
-                                    }
-                                    if (fmtp.config) this._mediaObject.fmtp.push(fmtp);
-                                    for (const fb of codec.rtcpFeedback) {
-                                        this._mediaObject.rtcpFb.push({
-                                            payload: codec.payloadType,
-                                            type: fb.type,
-                                            subtype: fb.parameter,
-                                        });
-                                    }
-                                }
-                                this._mediaObject.payloads = offerRtpParameters.codecs
-                                    .map((codec) => codec.payloadType)
-                                    .join(' ');
-                                this._mediaObject.ext = [];
-                                for (const ext of offerRtpParameters.headerExtensions) {
-                                    this._mediaObject.ext.push({
-                                        uri: ext.uri,
-                                        value: ext.id,
-                                    });
-                                }
-                                this._mediaObject.rtcpMux = 'rtcp-mux';
-                                this._mediaObject.rtcpRsize = 'rtcp-rsize';
-                                const encoding = offerRtpParameters.encodings[0];
-                                const ssrc = encoding.ssrc;
-                                const rtxSsrc = encoding.rtx && encoding.rtx.ssrc ? encoding.rtx.ssrc : undefined;
-                                this._mediaObject.ssrcs = [];
-                                this._mediaObject.ssrcGroups = [];
-                                if (offerRtpParameters.rtcp.cname) {
-                                    this._mediaObject.ssrcs.push({
-                                        id: ssrc,
-                                        attribute: 'cname',
-                                        value: offerRtpParameters.rtcp.cname,
-                                    });
-                                }
-                                if (this._planB) {
-                                    this._mediaObject.ssrcs.push({
-                                        id: ssrc,
-                                        attribute: 'msid',
-                                        value: `${streamId || '-'} ${trackId}`,
-                                    });
-                                }
-                                if (rtxSsrc) {
-                                    if (offerRtpParameters.rtcp.cname) {
-                                        this._mediaObject.ssrcs.push({
-                                            id: rtxSsrc,
-                                            attribute: 'cname',
-                                            value: offerRtpParameters.rtcp.cname,
-                                        });
-                                    }
-                                    if (this._planB) {
-                                        this._mediaObject.ssrcs.push({
-                                            id: rtxSsrc,
-                                            attribute: 'msid',
-                                            value: `${streamId || '-'} ${trackId}`,
-                                        });
-                                    }
-                                    // Associate original and retransmission SSRCs.
-                                    this._mediaObject.ssrcGroups.push({
-                                        semantics: 'FID',
-                                        ssrcs: `${ssrc} ${rtxSsrc}`,
-                                    });
-                                }
-                                break;
-                            }
-                            case 'application': {
-                                // New spec.
-                                if (!oldDataChannelSpec) {
-                                    this._mediaObject.payloads = 'webrtc-datachannel';
-                                    this._mediaObject.sctpPort = sctpParameters.port;
-                                    this._mediaObject.maxMessageSize = sctpParameters.maxMessageSize;
-                                }
-                                // Old spec.
-                                else {
-                                    this._mediaObject.payloads = sctpParameters.port;
-                                    this._mediaObject.sctpmap = {
-                                        app: 'webrtc-datachannel',
-                                        sctpmapNumber: sctpParameters.port,
-                                        maxMessageSize: sctpParameters.maxMessageSize,
-                                    };
-                                }
-                                break;
-                            }
-                        }
-                    }
-                    // eslint-disable-next-line @typescript-eslint/no-unused-vars
-                    setDtlsRole(role) {
-                        // Always 'actpass'.
-                        this._mediaObject.setup = 'actpass';
-                    }
-                    planBReceive({ offerRtpParameters, streamId, trackId }) {
-                        const encoding = offerRtpParameters.encodings[0];
-                        const ssrc = encoding.ssrc;
-                        const rtxSsrc = encoding.rtx && encoding.rtx.ssrc ? encoding.rtx.ssrc : undefined;
-                        if (offerRtpParameters.rtcp.cname) {
-                            this._mediaObject.ssrcs.push({
-                                id: ssrc,
-                                attribute: 'cname',
-                                value: offerRtpParameters.rtcp.cname,
-                            });
-                        }
-                        this._mediaObject.ssrcs.push({
-                            id: ssrc,
-                            attribute: 'msid',
-                            value: `${streamId || '-'} ${trackId}`,
-                        });
-                        if (rtxSsrc) {
-                            if (offerRtpParameters.rtcp.cname) {
-                                this._mediaObject.ssrcs.push({
-                                    id: rtxSsrc,
-                                    attribute: 'cname',
-                                    value: offerRtpParameters.rtcp.cname,
-                                });
-                            }
-                            this._mediaObject.ssrcs.push({
-                                id: rtxSsrc,
-                                attribute: 'msid',
-                                value: `${streamId || '-'} ${trackId}`,
-                            });
-                            // Associate original and retransmission SSRCs.
-                            this._mediaObject.ssrcGroups.push({
-                                semantics: 'FID',
-                                ssrcs: `${ssrc} ${rtxSsrc}`,
-                            });
-                        }
-                    }
-                    planBStopReceiving({ offerRtpParameters }) {
-                        const encoding = offerRtpParameters.encodings[0];
-                        const ssrc = encoding.ssrc;
-                        const rtxSsrc = encoding.rtx && encoding.rtx.ssrc ? encoding.rtx.ssrc : undefined;
-                        this._mediaObject.ssrcs = this._mediaObject.ssrcs.filter(
-                            (s) => s.id !== ssrc && s.id !== rtxSsrc,
-                        );
-                        if (rtxSsrc) {
-                            this._mediaObject.ssrcGroups = this._mediaObject.ssrcGroups.filter(
-                                (group) => group.ssrcs !== `${ssrc} ${rtxSsrc}`,
-                            );
-                        }
-                    }
-                }
-                exports.OfferMediaSection = OfferMediaSection;
-                function getCodecName(codec) {
-                    const MimeTypeRegex = new RegExp('^(audio|video)/(.+)', 'i');
-                    const mimeTypeMatch = MimeTypeRegex.exec(codec.mimeType);
-                    if (!mimeTypeMatch) throw new TypeError('invalid codec.mimeType');
-                    return mimeTypeMatch[2];
-                }
-            },
-            { '../../utils': 36 },
-        ],
-        28: [
-            function (require, module, exports) {
-                'use strict';
-                Object.defineProperty(exports, '__esModule', { value: true });
-                const sdpTransform = require('sdp-transform');
-                const Logger_1 = require('../../Logger');
-                const MediaSection_1 = require('./MediaSection');
-                const logger = new Logger_1.Logger('RemoteSdp');
-                class RemoteSdp {
-                    constructor({
-                        iceParameters,
-                        iceCandidates,
-                        dtlsParameters,
-                        sctpParameters,
-                        plainRtpParameters,
-                        planB = false,
-                    }) {
-                        // MediaSection instances.
-                        this._mediaSections = [];
-                        // MediaSection indices indexed by MID.
-                        this._midToIndex = new Map();
-                        this._iceParameters = iceParameters;
-                        this._iceCandidates = iceCandidates;
-                        this._dtlsParameters = dtlsParameters;
-                        this._sctpParameters = sctpParameters;
-                        this._plainRtpParameters = plainRtpParameters;
-                        this._planB = planB;
-                        this._sdpObject = {
-                            version: 0,
-                            origin: {
-                                address: '0.0.0.0',
-                                ipVer: 4,
-                                netType: 'IN',
-                                sessionId: 10000,
-                                sessionVersion: 0,
-                                username: 'mediasoup-client',
-                            },
-                            name: '-',
-                            timing: { start: 0, stop: 0 },
-                            media: [],
-                        };
-                        // If ICE parameters are given, add ICE-Lite indicator.
-                        if (iceParameters && iceParameters.iceLite) {
-                            this._sdpObject.icelite = 'ice-lite';
-                        }
-                        // If DTLS parameters are given, assume WebRTC and BUNDLE.
-                        if (dtlsParameters) {
-                            this._sdpObject.msidSemantic = { semantic: 'WMS', token: '*' };
-                            // NOTE: We take the latest fingerprint.
-                            const numFingerprints = this._dtlsParameters.fingerprints.length;
-                            this._sdpObject.fingerprint = {
-                                type: dtlsParameters.fingerprints[numFingerprints - 1].algorithm,
-                                hash: dtlsParameters.fingerprints[numFingerprints - 1].value,
-                            };
-                            this._sdpObject.groups = [{ type: 'BUNDLE', mids: '' }];
-                        }
-                        // If there are plain RPT parameters, override SDP origin.
-                        if (plainRtpParameters) {
-                            this._sdpObject.origin.address = plainRtpParameters.ip;
-                            this._sdpObject.origin.ipVer = plainRtpParameters.ipVersion;
-                        }
-                    }
-                    updateIceParameters(iceParameters) {
-                        logger.debug('updateIceParameters() [iceParameters:%o]', iceParameters);
-                        this._iceParameters = iceParameters;
-                        this._sdpObject.icelite = iceParameters.iceLite ? 'ice-lite' : undefined;
-                        for (const mediaSection of this._mediaSections) {
-                            mediaSection.setIceParameters(iceParameters);
-                        }
-                    }
-                    updateDtlsRole(role) {
-                        logger.debug('updateDtlsRole() [role:%s]', role);
-                        this._dtlsParameters.role = role;
-                        for (const mediaSection of this._mediaSections) {
-                            mediaSection.setDtlsRole(role);
-                        }
-                    }
-                    getNextMediaSectionIdx() {
-                        // If a closed media section is found, return its index.
-                        for (let idx = 0; idx < this._mediaSections.length; ++idx) {
-                            const mediaSection = this._mediaSections[idx];
-                            if (mediaSection.closed) return { idx, reuseMid: mediaSection.mid };
-                        }
-                        // If no closed media section is found, return next one.
-                        return { idx: this._mediaSections.length };
-                    }
-                    send({
-                        offerMediaObject,
-                        reuseMid,
-                        offerRtpParameters,
-                        answerRtpParameters,
-                        codecOptions,
-                        extmapAllowMixed = false,
-                    }) {
-                        const mediaSection = new MediaSection_1.AnswerMediaSection({
-                            iceParameters: this._iceParameters,
-                            iceCandidates: this._iceCandidates,
-                            dtlsParameters: this._dtlsParameters,
-                            plainRtpParameters: this._plainRtpParameters,
-                            planB: this._planB,
-                            offerMediaObject,
-                            offerRtpParameters,
-                            answerRtpParameters,
-                            codecOptions,
-                            extmapAllowMixed,
-                        });
-                        // Unified-Plan with closed media section replacement.
-                        if (reuseMid) {
-                            this._replaceMediaSection(mediaSection, reuseMid);
-                        }
-                        // Unified-Plan or Plan-B with different media kind.
-                        else if (!this._midToIndex.has(mediaSection.mid)) {
-                            this._addMediaSection(mediaSection);
-                        }
-                        // Plan-B with same media kind.
-                        else {
-                            this._replaceMediaSection(mediaSection);
-                        }
-                    }
-                    receive({ mid, kind, offerRtpParameters, streamId, trackId }) {
-                        const idx = this._midToIndex.get(mid);
-                        let mediaSection;
-                        if (idx !== undefined) mediaSection = this._mediaSections[idx];
-                        // Unified-Plan or different media kind.
-                        if (!mediaSection) {
-                            mediaSection = new MediaSection_1.OfferMediaSection({
-                                iceParameters: this._iceParameters,
-                                iceCandidates: this._iceCandidates,
-                                dtlsParameters: this._dtlsParameters,
-                                plainRtpParameters: this._plainRtpParameters,
-                                planB: this._planB,
-                                mid,
-                                kind,
-                                offerRtpParameters,
-                                streamId,
-                                trackId,
-                            });
-                            this._addMediaSection(mediaSection);
-                        }
-                        // Plan-B.
-                        else {
-                            mediaSection.planBReceive({ offerRtpParameters, streamId, trackId });
-                            this._replaceMediaSection(mediaSection);
-                        }
-                    }
-                    disableMediaSection(mid) {
-                        const idx = this._midToIndex.get(mid);
-                        if (idx === undefined) {
-                            throw new Error(`no media section found with mid '${mid}'`);
-                        }
-                        const mediaSection = this._mediaSections[idx];
-                        mediaSection.disable();
-                    }
-                    closeMediaSection(mid) {
-                        const idx = this._midToIndex.get(mid);
-                        if (idx === undefined) {
-                            throw new Error(`no media section found with mid '${mid}'`);
-                        }
-                        const mediaSection = this._mediaSections[idx];
-                        // NOTE: Closing the first m section is a pain since it invalidates the
-                        // bundled transport, so let's avoid it.
-                        if (mid === this._firstMid) {
-                            logger.debug(
-                                'closeMediaSection() | cannot close first media section, disabling it instead [mid:%s]',
-                                mid,
-                            );
-                            this.disableMediaSection(mid);
-                            return;
-                        }
-                        mediaSection.close();
-                        // Regenerate BUNDLE mids.
-                        this._regenerateBundleMids();
-                    }
-                    planBStopReceiving({ mid, offerRtpParameters }) {
-                        const idx = this._midToIndex.get(mid);
-                        if (idx === undefined) {
-                            throw new Error(`no media section found with mid '${mid}'`);
-                        }
-                        const mediaSection = this._mediaSections[idx];
-                        mediaSection.planBStopReceiving({ offerRtpParameters });
-                        this._replaceMediaSection(mediaSection);
-                    }
-                    sendSctpAssociation({ offerMediaObject }) {
-                        const mediaSection = new MediaSection_1.AnswerMediaSection({
-                            iceParameters: this._iceParameters,
-                            iceCandidates: this._iceCandidates,
-                            dtlsParameters: this._dtlsParameters,
-                            sctpParameters: this._sctpParameters,
-                            plainRtpParameters: this._plainRtpParameters,
-                            offerMediaObject,
-                        });
-                        this._addMediaSection(mediaSection);
-                    }
-                    receiveSctpAssociation({ oldDataChannelSpec = false } = {}) {
-                        const mediaSection = new MediaSection_1.OfferMediaSection({
-                            iceParameters: this._iceParameters,
-                            iceCandidates: this._iceCandidates,
-                            dtlsParameters: this._dtlsParameters,
-                            sctpParameters: this._sctpParameters,
-                            plainRtpParameters: this._plainRtpParameters,
-                            mid: 'datachannel',
-                            kind: 'application',
-                            oldDataChannelSpec,
-                        });
-                        this._addMediaSection(mediaSection);
-                    }
-                    getSdp() {
-                        // Increase SDP version.
-                        this._sdpObject.origin.sessionVersion++;
-                        return sdpTransform.write(this._sdpObject);
-                    }
-                    _addMediaSection(newMediaSection) {
-                        if (!this._firstMid) this._firstMid = newMediaSection.mid;
-                        // Add to the vector.
-                        this._mediaSections.push(newMediaSection);
-                        // Add to the map.
-                        this._midToIndex.set(newMediaSection.mid, this._mediaSections.length - 1);
-                        // Add to the SDP object.
-                        this._sdpObject.media.push(newMediaSection.getObject());
-                        // Regenerate BUNDLE mids.
-                        this._regenerateBundleMids();
-                    }
-                    _replaceMediaSection(newMediaSection, reuseMid) {
-                        // Store it in the map.
-                        if (typeof reuseMid === 'string') {
-                            const idx = this._midToIndex.get(reuseMid);
-                            if (idx === undefined) {
-                                throw new Error(`no media section found for reuseMid '${reuseMid}'`);
-                            }
-                            const oldMediaSection = this._mediaSections[idx];
-                            // Replace the index in the vector with the new media section.
-                            this._mediaSections[idx] = newMediaSection;
-                            // Update the map.
-                            this._midToIndex.delete(oldMediaSection.mid);
-                            this._midToIndex.set(newMediaSection.mid, idx);
-                            // Update the SDP object.
-                            this._sdpObject.media[idx] = newMediaSection.getObject();
-                            // Regenerate BUNDLE mids.
-                            this._regenerateBundleMids();
-                        } else {
-                            const idx = this._midToIndex.get(newMediaSection.mid);
-                            if (idx === undefined) {
-                                throw new Error(`no media section found with mid '${newMediaSection.mid}'`);
-                            }
-                            // Replace the index in the vector with the new media section.
-                            this._mediaSections[idx] = newMediaSection;
-                            // Update the SDP object.
-                            this._sdpObject.media[idx] = newMediaSection.getObject();
-                        }
-                    }
-                    _regenerateBundleMids() {
-                        if (!this._dtlsParameters) return;
-                        this._sdpObject.groups[0].mids = this._mediaSections
-                            .filter((mediaSection) => !mediaSection.closed)
-                            .map((mediaSection) => mediaSection.mid)
-                            .join(' ');
-                    }
-                }
-                exports.RemoteSdp = RemoteSdp;
-            },
-            { '../../Logger': 12, './MediaSection': 27, 'sdp-transform': 41 },
-        ],
-        29: [
-            function (require, module, exports) {
-                'use strict';
-                Object.defineProperty(exports, '__esModule', { value: true });
-                const sdpTransform = require('sdp-transform');
-                function extractRtpCapabilities({ sdpObject }) {
-                    // Map of RtpCodecParameters indexed by payload type.
-                    const codecsMap = new Map();
-                    // Array of RtpHeaderExtensions.
-                    const headerExtensions = [];
-                    // Whether a m=audio/video section has been already found.
-                    let gotAudio = false;
-                    let gotVideo = false;
-                    for (const m of sdpObject.media) {
-                        const kind = m.type;
-                        switch (kind) {
-                            case 'audio': {
-                                if (gotAudio) continue;
-                                gotAudio = true;
-                                break;
-                            }
-                            case 'video': {
-                                if (gotVideo) continue;
-                                gotVideo = true;
-                                break;
-                            }
-                            default: {
-                                continue;
-                            }
-                        }
-                        // Get codecs.
-                        for (const rtp of m.rtp) {
-                            const codec = {
-                                kind: kind,
-                                mimeType: `${kind}/${rtp.codec}`,
-                                preferredPayloadType: rtp.payload,
-                                clockRate: rtp.rate,
-                                channels: rtp.encoding,
-                                parameters: {},
-                                rtcpFeedback: [],
-                            };
-                            codecsMap.set(codec.preferredPayloadType, codec);
-                        }
-                        // Get codec parameters.
-                        for (const fmtp of m.fmtp || []) {
-                            const parameters = sdpTransform.parseParams(fmtp.config);
-                            const codec = codecsMap.get(fmtp.payload);
-                            if (!codec) continue;
-                            // Specials case to convert parameter value to string.
-                            if (parameters && parameters['profile-level-id'])
-                                parameters['profile-level-id'] = String(parameters['profile-level-id']);
-                            codec.parameters = parameters;
-                        }
-                        // Get RTCP feedback for each codec.
-                        for (const fb of m.rtcpFb || []) {
-                            const codec = codecsMap.get(fb.payload);
-                            if (!codec) continue;
-                            const feedback = {
-                                type: fb.type,
-                                parameter: fb.subtype,
-                            };
-                            if (!feedback.parameter) delete feedback.parameter;
-                            codec.rtcpFeedback.push(feedback);
-                        }
-                        // Get RTP header extensions.
-                        for (const ext of m.ext || []) {
-                            // Ignore encrypted extensions (not yet supported in mediasoup).
-                            if (ext['encrypt-uri']) continue;
-                            const headerExtension = {
-                                kind: kind,
-                                uri: ext.uri,
-                                preferredId: ext.value,
-                            };
-                            headerExtensions.push(headerExtension);
-                        }
-                    }
-                    const rtpCapabilities = {
-                        codecs: Array.from(codecsMap.values()),
-                        headerExtensions: headerExtensions,
-                    };
-                    return rtpCapabilities;
-                }
-                exports.extractRtpCapabilities = extractRtpCapabilities;
-                function extractDtlsParameters({ sdpObject }) {
-                    const mediaObject = (sdpObject.media || []).find((m) => m.iceUfrag && m.port !== 0);
-                    if (!mediaObject) throw new Error('no active media section found');
-                    const fingerprint = mediaObject.fingerprint || sdpObject.fingerprint;
-                    let role;
-                    switch (mediaObject.setup) {
-                        case 'active':
-                            role = 'client';
-                            break;
-                        case 'passive':
-                            role = 'server';
-                            break;
-                        case 'actpass':
-                            role = 'auto';
-                            break;
-                    }
-                    const dtlsParameters = {
-                        role,
-                        fingerprints: [
-                            {
-                                algorithm: fingerprint.type,
-                                value: fingerprint.hash,
-                            },
-                        ],
-                    };
-                    return dtlsParameters;
-                }
-                exports.extractDtlsParameters = extractDtlsParameters;
-                function getCname({ offerMediaObject }) {
-                    const ssrcCnameLine = (offerMediaObject.ssrcs || []).find((line) => line.attribute === 'cname');
-                    if (!ssrcCnameLine) return '';
-                    return ssrcCnameLine.value;
-                }
-                exports.getCname = getCname;
-                /**
-                 * Apply codec parameters in the given SDP m= section answer based on the
-                 * given RTP parameters of an offer.
-                 */
-                function applyCodecParameters({ offerRtpParameters, answerMediaObject }) {
-                    for (const codec of offerRtpParameters.codecs) {
-                        const mimeType = codec.mimeType.toLowerCase();
-                        // Avoid parsing codec parameters for unhandled codecs.
-                        if (mimeType !== 'audio/opus') continue;
-                        const rtp = (answerMediaObject.rtp || []).find((r) => r.payload === codec.payloadType);
-                        if (!rtp) continue;
-                        // Just in case.
-                        answerMediaObject.fmtp = answerMediaObject.fmtp || [];
-                        let fmtp = answerMediaObject.fmtp.find((f) => f.payload === codec.payloadType);
-                        if (!fmtp) {
-                            fmtp = { payload: codec.payloadType, config: '' };
-                            answerMediaObject.fmtp.push(fmtp);
-                        }
-                        const parameters = sdpTransform.parseParams(fmtp.config);
-                        switch (mimeType) {
-                            case 'audio/opus': {
-                                const spropStereo = codec.parameters['sprop-stereo'];
-                                if (spropStereo !== undefined) parameters.stereo = spropStereo ? 1 : 0;
-                                break;
-                            }
-                        }
-                        // Write the codec fmtp.config back.
-                        fmtp.config = '';
-                        for (const key of Object.keys(parameters)) {
-                            if (fmtp.config) fmtp.config += ';';
-                            fmtp.config += `${key}=${parameters[key]}`;
-                        }
-                    }
-                }
-                exports.applyCodecParameters = applyCodecParameters;
-            },
-            { 'sdp-transform': 41 },
-        ],
-        30: [
-            function (require, module, exports) {
-                'use strict';
-                Object.defineProperty(exports, '__esModule', { value: true });
-                function getRtpEncodings({ offerMediaObject, track }) {
-                    // First media SSRC (or the only one).
-                    let firstSsrc;
-                    const ssrcs = new Set();
-                    for (const line of offerMediaObject.ssrcs || []) {
-                        if (line.attribute !== 'msid') continue;
-                        const trackId = line.value.split(' ')[1];
-                        if (trackId === track.id) {
-                            const ssrc = line.id;
-                            ssrcs.add(ssrc);
-                            if (!firstSsrc) firstSsrc = ssrc;
-                        }
-                    }
-                    if (ssrcs.size === 0)
-                        throw new Error(`a=ssrc line with msid information not found [track.id:${track.id}]`);
-                    const ssrcToRtxSsrc = new Map();
-                    // First assume RTX is used.
-                    for (const line of offerMediaObject.ssrcGroups || []) {
-                        if (line.semantics !== 'FID') continue;
-                        let [ssrc, rtxSsrc] = line.ssrcs.split(/\s+/);
-                        ssrc = Number(ssrc);
-                        rtxSsrc = Number(rtxSsrc);
-                        if (ssrcs.has(ssrc)) {
-                            // Remove both the SSRC and RTX SSRC from the set so later we know that they
-                            // are already handled.
-                            ssrcs.delete(ssrc);
-                            ssrcs.delete(rtxSsrc);
-                            // Add to the map.
-                            ssrcToRtxSsrc.set(ssrc, rtxSsrc);
-                        }
-                    }
-                    // If the set of SSRCs is not empty it means that RTX is not being used, so take
-                    // media SSRCs from there.
-                    for (const ssrc of ssrcs) {
-                        // Add to the map.
-                        ssrcToRtxSsrc.set(ssrc, null);
-                    }
-                    const encodings = [];
-                    for (const [ssrc, rtxSsrc] of ssrcToRtxSsrc) {
-                        const encoding = { ssrc };
-                        if (rtxSsrc) encoding.rtx = { ssrc: rtxSsrc };
-                        encodings.push(encoding);
-                    }
-                    return encodings;
-                }
-                exports.getRtpEncodings = getRtpEncodings;
-                /**
-                 * Adds multi-ssrc based simulcast into the given SDP media section offer.
-                 */
-                function addLegacySimulcast({ offerMediaObject, track, numStreams }) {
-                    if (numStreams <= 1) throw new TypeError('numStreams must be greater than 1');
-                    let firstSsrc;
-                    let firstRtxSsrc;
-                    let streamId;
-                    // Get the SSRC.
-                    const ssrcMsidLine = (offerMediaObject.ssrcs || []).find((line) => {
-                        if (line.attribute !== 'msid') return false;
-                        const trackId = line.value.split(' ')[1];
-                        if (trackId === track.id) {
-                            firstSsrc = line.id;
-                            streamId = line.value.split(' ')[0];
-                            return true;
-                        } else {
-                            return false;
-                        }
-                    });
-                    if (!ssrcMsidLine)
-                        throw new Error(`a=ssrc line with msid information not found [track.id:${track.id}]`);
-                    // Get the SSRC for RTX.
-                    (offerMediaObject.ssrcGroups || []).some((line) => {
-                        if (line.semantics !== 'FID') return false;
-                        const ssrcs = line.ssrcs.split(/\s+/);
-                        if (Number(ssrcs[0]) === firstSsrc) {
-                            firstRtxSsrc = Number(ssrcs[1]);
-                            return true;
-                        } else {
-                            return false;
-                        }
-                    });
-                    const ssrcCnameLine = offerMediaObject.ssrcs.find(
-                        (line) => line.attribute === 'cname' && line.id === firstSsrc,
-                    );
-                    if (!ssrcCnameLine)
-                        throw new Error(`a=ssrc line with cname information not found [track.id:${track.id}]`);
-                    const cname = ssrcCnameLine.value;
-                    const ssrcs = [];
-                    const rtxSsrcs = [];
-                    for (let i = 0; i < numStreams; ++i) {
-                        ssrcs.push(firstSsrc + i);
-                        if (firstRtxSsrc) rtxSsrcs.push(firstRtxSsrc + i);
-                    }
-                    offerMediaObject.ssrcGroups = offerMediaObject.ssrcGroups || [];
-                    offerMediaObject.ssrcs = offerMediaObject.ssrcs || [];
-                    offerMediaObject.ssrcGroups.push({
-                        semantics: 'SIM',
-                        ssrcs: ssrcs.join(' '),
-                    });
-                    for (let i = 0; i < ssrcs.length; ++i) {
-                        const ssrc = ssrcs[i];
-                        offerMediaObject.ssrcs.push({
-                            id: ssrc,
-                            attribute: 'cname',
-                            value: cname,
-                        });
-                        offerMediaObject.ssrcs.push({
-                            id: ssrc,
-                            attribute: 'msid',
-                            value: `${streamId} ${track.id}`,
-                        });
-                    }
-                    for (let i = 0; i < rtxSsrcs.length; ++i) {
-                        const ssrc = ssrcs[i];
-                        const rtxSsrc = rtxSsrcs[i];
-                        offerMediaObject.ssrcs.push({
-                            id: rtxSsrc,
-                            attribute: 'cname',
-                            value: cname,
-                        });
-                        offerMediaObject.ssrcs.push({
-                            id: rtxSsrc,
-                            attribute: 'msid',
-                            value: `${streamId} ${track.id}`,
-                        });
-                        offerMediaObject.ssrcGroups.push({
-                            semantics: 'FID',
-                            ssrcs: `${ssrc} ${rtxSsrc}`,
-                        });
-                    }
-                }
-                exports.addLegacySimulcast = addLegacySimulcast;
-            },
-            {},
-        ],
-        31: [
-            function (require, module, exports) {
-                'use strict';
-                Object.defineProperty(exports, '__esModule', { value: true });
-                function getRtpEncodings({ offerMediaObject }) {
-                    const ssrcs = new Set();
-                    for (const line of offerMediaObject.ssrcs || []) {
-                        const ssrc = line.id;
-                        ssrcs.add(ssrc);
-                    }
-                    if (ssrcs.size === 0) throw new Error('no a=ssrc lines found');
-                    const ssrcToRtxSsrc = new Map();
-                    // First assume RTX is used.
-                    for (const line of offerMediaObject.ssrcGroups || []) {
-                        if (line.semantics !== 'FID') continue;
-                        let [ssrc, rtxSsrc] = line.ssrcs.split(/\s+/);
-                        ssrc = Number(ssrc);
-                        rtxSsrc = Number(rtxSsrc);
-                        if (ssrcs.has(ssrc)) {
-                            // Remove both the SSRC and RTX SSRC from the set so later we know that they
-                            // are already handled.
-                            ssrcs.delete(ssrc);
-                            ssrcs.delete(rtxSsrc);
-                            // Add to the map.
-                            ssrcToRtxSsrc.set(ssrc, rtxSsrc);
-                        }
-                    }
-                    // If the set of SSRCs is not empty it means that RTX is not being used, so take
-                    // media SSRCs from there.
-                    for (const ssrc of ssrcs) {
-                        // Add to the map.
-                        ssrcToRtxSsrc.set(ssrc, null);
-                    }
-                    const encodings = [];
-                    for (const [ssrc, rtxSsrc] of ssrcToRtxSsrc) {
-                        const encoding = { ssrc };
-                        if (rtxSsrc) encoding.rtx = { ssrc: rtxSsrc };
-                        encodings.push(encoding);
-                    }
-                    return encodings;
-                }
-                exports.getRtpEncodings = getRtpEncodings;
-                /**
-                 * Adds multi-ssrc based simulcast into the given SDP media section offer.
-                 */
-                function addLegacySimulcast({ offerMediaObject, numStreams }) {
-                    if (numStreams <= 1) throw new TypeError('numStreams must be greater than 1');
-                    // Get the SSRC.
-                    const ssrcMsidLine = (offerMediaObject.ssrcs || []).find((line) => line.attribute === 'msid');
-                    if (!ssrcMsidLine) throw new Error('a=ssrc line with msid information not found');
-                    const [streamId, trackId] = ssrcMsidLine.value.split(' ')[0];
-                    const firstSsrc = ssrcMsidLine.id;
-                    let firstRtxSsrc;
-                    // Get the SSRC for RTX.
-                    (offerMediaObject.ssrcGroups || []).some((line) => {
-                        if (line.semantics !== 'FID') return false;
-                        const ssrcs = line.ssrcs.split(/\s+/);
-                        if (Number(ssrcs[0]) === firstSsrc) {
-                            firstRtxSsrc = Number(ssrcs[1]);
-                            return true;
-                        } else {
-                            return false;
-                        }
-                    });
-                    const ssrcCnameLine = offerMediaObject.ssrcs.find((line) => line.attribute === 'cname');
-                    if (!ssrcCnameLine) throw new Error('a=ssrc line with cname information not found');
-                    const cname = ssrcCnameLine.value;
-                    const ssrcs = [];
-                    const rtxSsrcs = [];
-                    for (let i = 0; i < numStreams; ++i) {
-                        ssrcs.push(firstSsrc + i);
-                        if (firstRtxSsrc) rtxSsrcs.push(firstRtxSsrc + i);
-                    }
-                    offerMediaObject.ssrcGroups = [];
-                    offerMediaObject.ssrcs = [];
-                    offerMediaObject.ssrcGroups.push({
-                        semantics: 'SIM',
-                        ssrcs: ssrcs.join(' '),
-                    });
-                    for (let i = 0; i < ssrcs.length; ++i) {
-                        const ssrc = ssrcs[i];
-                        offerMediaObject.ssrcs.push({
-                            id: ssrc,
-                            attribute: 'cname',
-                            value: cname,
-                        });
-                        offerMediaObject.ssrcs.push({
-                            id: ssrc,
-                            attribute: 'msid',
-                            value: `${streamId} ${trackId}`,
-                        });
-                    }
-                    for (let i = 0; i < rtxSsrcs.length; ++i) {
-                        const ssrc = ssrcs[i];
-                        const rtxSsrc = rtxSsrcs[i];
-                        offerMediaObject.ssrcs.push({
-                            id: rtxSsrc,
-                            attribute: 'cname',
-                            value: cname,
-                        });
-                        offerMediaObject.ssrcs.push({
-                            id: rtxSsrc,
-                            attribute: 'msid',
-                            value: `${streamId} ${trackId}`,
-                        });
-                        offerMediaObject.ssrcGroups.push({
-                            semantics: 'FID',
-                            ssrcs: `${ssrc} ${rtxSsrc}`,
-                        });
-                    }
-                }
-                exports.addLegacySimulcast = addLegacySimulcast;
-            },
-            {},
-        ],
-        32: [
-            function (require, module, exports) {
-                'use strict';
-                Object.defineProperty(exports, '__esModule', { value: true });
-                const Device_1 = require('./Device');
-                exports.Device = Device_1.Device;
-                exports.detectDevice = Device_1.detectDevice;
-                const types = require('./types');
-                exports.types = types;
-                /**
-                 * Expose mediasoup-client version.
-                 */
-                exports.version = '3.6.12';
-                /**
-                 * Expose parseScalabilityMode() function.
-                 */
-                var scalabilityModes_1 = require('./scalabilityModes');
-                exports.parseScalabilityMode = scalabilityModes_1.parse;
-            },
-            { './Device': 10, './scalabilityModes': 34, './types': 35 },
-        ],
-        33: [
-            function (require, module, exports) {
-                'use strict';
-                Object.defineProperty(exports, '__esModule', { value: true });
-                const h264 = require('h264-profile-level-id');
-                const utils_1 = require('./utils');
-                const RTP_PROBATOR_MID = 'probator';
-                const RTP_PROBATOR_SSRC = 1234;
-                const RTP_PROBATOR_CODEC_PAYLOAD_TYPE = 127;
-                /**
-                 * Validates RtpCapabilities. It may modify given data by adding missing
-                 * fields with default values.
-                 * It throws if invalid.
-                 */
-                function validateRtpCapabilities(caps) {
-                    if (typeof caps !== 'object') throw new TypeError('caps is not an object');
-                    // codecs is optional. If unset, fill with an empty array.
-                    if (caps.codecs && !Array.isArray(caps.codecs)) throw new TypeError('caps.codecs is not an array');
-                    else if (!caps.codecs) caps.codecs = [];
-                    for (const codec of caps.codecs) {
-                        validateRtpCodecCapability(codec);
-                    }
-                    // headerExtensions is optional. If unset, fill with an empty array.
-                    if (caps.headerExtensions && !Array.isArray(caps.headerExtensions))
-                        throw new TypeError('caps.headerExtensions is not an array');
-                    else if (!caps.headerExtensions) caps.headerExtensions = [];
-                    for (const ext of caps.headerExtensions) {
-                        validateRtpHeaderExtension(ext);
-                    }
-                }
-                exports.validateRtpCapabilities = validateRtpCapabilities;
-                /**
-                 * Validates RtpCodecCapability. It may modify given data by adding missing
-                 * fields with default values.
-                 * It throws if invalid.
-                 */
-                function validateRtpCodecCapability(codec) {
-                    const MimeTypeRegex = new RegExp('^(audio|video)/(.+)', 'i');
-                    if (typeof codec !== 'object') throw new TypeError('codec is not an object');
-                    // mimeType is mandatory.
-                    if (!codec.mimeType || typeof codec.mimeType !== 'string')
-                        throw new TypeError('missing codec.mimeType');
-                    const mimeTypeMatch = MimeTypeRegex.exec(codec.mimeType);
-                    if (!mimeTypeMatch) throw new TypeError('invalid codec.mimeType');
-                    // Just override kind with media component of mimeType.
-                    codec.kind = mimeTypeMatch[1].toLowerCase();
-                    // preferredPayloadType is optional.
-                    if (codec.preferredPayloadType && typeof codec.preferredPayloadType !== 'number')
-                        throw new TypeError('invalid codec.preferredPayloadType');
-                    // clockRate is mandatory.
-                    if (typeof codec.clockRate !== 'number') throw new TypeError('missing codec.clockRate');
-                    // channels is optional. If unset, set it to 1 (just if audio).
-                    if (codec.kind === 'audio') {
-                        if (typeof codec.channels !== 'number') codec.channels = 1;
-                    } else {
-                        delete codec.channels;
-                    }
-                    // parameters is optional. If unset, set it to an empty object.
-                    if (!codec.parameters || typeof codec.parameters !== 'object') codec.parameters = {};
-                    for (const key of Object.keys(codec.parameters)) {
-                        let value = codec.parameters[key];
-                        if (value === undefined) {
-                            codec.parameters[key] = '';
-                            value = '';
-                        }
-                        if (typeof value !== 'string' && typeof value !== 'number') {
-                            throw new TypeError(`invalid codec parameter [key:${key}s, value:${value}]`);
-                        }
-                        // Specific parameters validation.
-                        if (key === 'apt') {
-                            if (typeof value !== 'number') throw new TypeError('invalid codec apt parameter');
-                        }
-                    }
-                    // rtcpFeedback is optional. If unset, set it to an empty array.
-                    if (!codec.rtcpFeedback || !Array.isArray(codec.rtcpFeedback)) codec.rtcpFeedback = [];
-                    for (const fb of codec.rtcpFeedback) {
-                        validateRtcpFeedback(fb);
-                    }
-                }
-                exports.validateRtpCodecCapability = validateRtpCodecCapability;
-                /**
-                 * Validates RtcpFeedback. It may modify given data by adding missing
-                 * fields with default values.
-                 * It throws if invalid.
-                 */
-                function validateRtcpFeedback(fb) {
-                    if (typeof fb !== 'object') throw new TypeError('fb is not an object');
-                    // type is mandatory.
-                    if (!fb.type || typeof fb.type !== 'string') throw new TypeError('missing fb.type');
-                    // parameter is optional. If unset set it to an empty string.
-                    if (!fb.parameter || typeof fb.parameter !== 'string') fb.parameter = '';
-                }
-                exports.validateRtcpFeedback = validateRtcpFeedback;
-                /**
-                 * Validates RtpHeaderExtension. It may modify given data by adding missing
-                 * fields with default values.
-                 * It throws if invalid.
-                 */
-                function validateRtpHeaderExtension(ext) {
-                    if (typeof ext !== 'object') throw new TypeError('ext is not an object');
-                    // kind is optional. If unset set it to an empty string.
-                    if (!ext.kind || typeof ext.kind !== 'string') ext.kind = '';
-                    if (ext.kind !== '' && ext.kind !== 'audio' && ext.kind !== 'video')
-                        throw new TypeError('invalid ext.kind');
-                    // uri is mandatory.
-                    if (!ext.uri || typeof ext.uri !== 'string') throw new TypeError('missing ext.uri');
-                    // preferredId is mandatory.
-                    if (typeof ext.preferredId !== 'number') throw new TypeError('missing ext.preferredId');
-                    // preferredEncrypt is optional. If unset set it to false.
-                    if (ext.preferredEncrypt && typeof ext.preferredEncrypt !== 'boolean')
-                        throw new TypeError('invalid ext.preferredEncrypt');
-                    else if (!ext.preferredEncrypt) ext.preferredEncrypt = false;
-                    // direction is optional. If unset set it to sendrecv.
-                    if (ext.direction && typeof ext.direction !== 'string')
-                        throw new TypeError('invalid ext.direction');
-                    else if (!ext.direction) ext.direction = 'sendrecv';
-                }
-                exports.validateRtpHeaderExtension = validateRtpHeaderExtension;
-                /**
-                 * Validates RtpParameters. It may modify given data by adding missing
-                 * fields with default values.
-                 * It throws if invalid.
-                 */
-                function validateRtpParameters(params) {
-                    if (typeof params !== 'object') throw new TypeError('params is not an object');
-                    // mid is optional.
-                    if (params.mid && typeof params.mid !== 'string') throw new TypeError('params.mid is not a string');
-                    // codecs is mandatory.
-                    if (!Array.isArray(params.codecs)) throw new TypeError('missing params.codecs');
-                    for (const codec of params.codecs) {
-                        validateRtpCodecParameters(codec);
-                    }
-                    // headerExtensions is optional. If unset, fill with an empty array.
-                    if (params.headerExtensions && !Array.isArray(params.headerExtensions))
-                        throw new TypeError('params.headerExtensions is not an array');
-                    else if (!params.headerExtensions) params.headerExtensions = [];
-                    for (const ext of params.headerExtensions) {
-                        validateRtpHeaderExtensionParameters(ext);
-                    }
-                    // encodings is optional. If unset, fill with an empty array.
-                    if (params.encodings && !Array.isArray(params.encodings))
-                        throw new TypeError('params.encodings is not an array');
-                    else if (!params.encodings) params.encodings = [];
-                    for (const encoding of params.encodings) {
-                        validateRtpEncodingParameters(encoding);
-                    }
-                    // rtcp is optional. If unset, fill with an empty object.
-                    if (params.rtcp && typeof params.rtcp !== 'object')
-                        throw new TypeError('params.rtcp is not an object');
-                    else if (!params.rtcp) params.rtcp = {};
-                    validateRtcpParameters(params.rtcp);
-                }
-                exports.validateRtpParameters = validateRtpParameters;
-                /**
-                 * Validates RtpCodecParameters. It may modify given data by adding missing
-                 * fields with default values.
-                 * It throws if invalid.
-                 */
-                function validateRtpCodecParameters(codec) {
-                    const MimeTypeRegex = new RegExp('^(audio|video)/(.+)', 'i');
-                    if (typeof codec !== 'object') throw new TypeError('codec is not an object');
-                    // mimeType is mandatory.
-                    if (!codec.mimeType || typeof codec.mimeType !== 'string')
-                        throw new TypeError('missing codec.mimeType');
-                    const mimeTypeMatch = MimeTypeRegex.exec(codec.mimeType);
-                    if (!mimeTypeMatch) throw new TypeError('invalid codec.mimeType');
-                    // payloadType is mandatory.
-                    if (typeof codec.payloadType !== 'number') throw new TypeError('missing codec.payloadType');
-                    // clockRate is mandatory.
-                    if (typeof codec.clockRate !== 'number') throw new TypeError('missing codec.clockRate');
-                    const kind = mimeTypeMatch[1].toLowerCase();
-                    // channels is optional. If unset, set it to 1 (just if audio).
-                    if (kind === 'audio') {
-                        if (typeof codec.channels !== 'number') codec.channels = 1;
-                    } else {
-                        delete codec.channels;
-                    }
-                    // parameters is optional. If unset, set it to an empty object.
-                    if (!codec.parameters || typeof codec.parameters !== 'object') codec.parameters = {};
-                    for (const key of Object.keys(codec.parameters)) {
-                        let value = codec.parameters[key];
-                        if (value === undefined) {
-                            codec.parameters[key] = '';
-                            value = '';
-                        }
-                        if (typeof value !== 'string' && typeof value !== 'number') {
-                            throw new TypeError(`invalid codec parameter [key:${key}s, value:${value}]`);
-                        }
-                        // Specific parameters validation.
-                        if (key === 'apt') {
-                            if (typeof value !== 'number') throw new TypeError('invalid codec apt parameter');
-                        }
-                    }
-                    // rtcpFeedback is optional. If unset, set it to an empty array.
-                    if (!codec.rtcpFeedback || !Array.isArray(codec.rtcpFeedback)) codec.rtcpFeedback = [];
-                    for (const fb of codec.rtcpFeedback) {
-                        validateRtcpFeedback(fb);
-                    }
-                }
-                exports.validateRtpCodecParameters = validateRtpCodecParameters;
-                /**
-                 * Validates RtpHeaderExtensionParameteters. It may modify given data by adding missing
-                 * fields with default values.
-                 * It throws if invalid.
-                 */
-                function validateRtpHeaderExtensionParameters(ext) {
-                    if (typeof ext !== 'object') throw new TypeError('ext is not an object');
-                    // uri is mandatory.
-                    if (!ext.uri || typeof ext.uri !== 'string') throw new TypeError('missing ext.uri');
-                    // id is mandatory.
-                    if (typeof ext.id !== 'number') throw new TypeError('missing ext.id');
-                    // encrypt is optional. If unset set it to false.
-                    if (ext.encrypt && typeof ext.encrypt !== 'boolean') throw new TypeError('invalid ext.encrypt');
-                    else if (!ext.encrypt) ext.encrypt = false;
-                    // parameters is optional. If unset, set it to an empty object.
-                    if (!ext.parameters || typeof ext.parameters !== 'object') ext.parameters = {};
-                    for (const key of Object.keys(ext.parameters)) {
-                        let value = ext.parameters[key];
-                        if (value === undefined) {
-                            ext.parameters[key] = '';
-                            value = '';
-                        }
-                        if (typeof value !== 'string' && typeof value !== 'number')
-                            throw new TypeError('invalid header extension parameter');
-                    }
-                }
-                exports.validateRtpHeaderExtensionParameters = validateRtpHeaderExtensionParameters;
-                /**
-                 * Validates RtpEncodingParameters. It may modify given data by adding missing
-                 * fields with default values.
-                 * It throws if invalid.
-                 */
-                function validateRtpEncodingParameters(encoding) {
-                    if (typeof encoding !== 'object') throw new TypeError('encoding is not an object');
-                    // ssrc is optional.
-                    if (encoding.ssrc && typeof encoding.ssrc !== 'number')
-                        throw new TypeError('invalid encoding.ssrc');
-                    // rid is optional.
-                    if (encoding.rid && typeof encoding.rid !== 'string') throw new TypeError('invalid encoding.rid');
-                    // rtx is optional.
-                    if (encoding.rtx && typeof encoding.rtx !== 'object') {
-                        throw new TypeError('invalid encoding.rtx');
-                    } else if (encoding.rtx) {
-                        // RTX ssrc is mandatory if rtx is present.
-                        if (typeof encoding.rtx.ssrc !== 'number') throw new TypeError('missing encoding.rtx.ssrc');
-                    }
-                    // dtx is optional. If unset set it to false.
-                    if (!encoding.dtx || typeof encoding.dtx !== 'boolean') encoding.dtx = false;
-                    // scalabilityMode is optional.
-                    if (encoding.scalabilityMode && typeof encoding.scalabilityMode !== 'string')
-                        throw new TypeError('invalid encoding.scalabilityMode');
-                }
-                exports.validateRtpEncodingParameters = validateRtpEncodingParameters;
-                /**
-                 * Validates RtcpParameters. It may modify given data by adding missing
-                 * fields with default values.
-                 * It throws if invalid.
-                 */
-                function validateRtcpParameters(rtcp) {
-                    if (typeof rtcp !== 'object') throw new TypeError('rtcp is not an object');
-                    // cname is optional.
-                    if (rtcp.cname && typeof rtcp.cname !== 'string') throw new TypeError('invalid rtcp.cname');
-                    // reducedSize is optional. If unset set it to true.
-                    if (!rtcp.reducedSize || typeof rtcp.reducedSize !== 'boolean') rtcp.reducedSize = true;
-                }
-                exports.validateRtcpParameters = validateRtcpParameters;
-                /**
-                 * Validates SctpCapabilities. It may modify given data by adding missing
-                 * fields with default values.
-                 * It throws if invalid.
-                 */
-                function validateSctpCapabilities(caps) {
-                    if (typeof caps !== 'object') throw new TypeError('caps is not an object');
-                    // numStreams is mandatory.
-                    if (!caps.numStreams || typeof caps.numStreams !== 'object')
-                        throw new TypeError('missing caps.numStreams');
-                    validateNumSctpStreams(caps.numStreams);
-                }
-                exports.validateSctpCapabilities = validateSctpCapabilities;
-                /**
-                 * Validates NumSctpStreams. It may modify given data by adding missing
-                 * fields with default values.
-                 * It throws if invalid.
-                 */
-                function validateNumSctpStreams(numStreams) {
-                    if (typeof numStreams !== 'object') throw new TypeError('numStreams is not an object');
-                    // OS is mandatory.
-                    if (typeof numStreams.OS !== 'number') throw new TypeError('missing numStreams.OS');
-                    // MIS is mandatory.
-                    if (typeof numStreams.MIS !== 'number') throw new TypeError('missing numStreams.MIS');
-                }
-                exports.validateNumSctpStreams = validateNumSctpStreams;
-                /**
-                 * Validates SctpParameters. It may modify given data by adding missing
-                 * fields with default values.
-                 * It throws if invalid.
-                 */
-                function validateSctpParameters(params) {
-                    if (typeof params !== 'object') throw new TypeError('params is not an object');
-                    // port is mandatory.
-                    if (typeof params.port !== 'number') throw new TypeError('missing params.port');
-                    // OS is mandatory.
-                    if (typeof params.OS !== 'number') throw new TypeError('missing params.OS');
-                    // MIS is mandatory.
-                    if (typeof params.MIS !== 'number') throw new TypeError('missing params.MIS');
-                    // maxMessageSize is mandatory.
-                    if (typeof params.maxMessageSize !== 'number') throw new TypeError('missing params.maxMessageSize');
-                }
-                exports.validateSctpParameters = validateSctpParameters;
-                /**
-                 * Validates SctpStreamParameters. It may modify given data by adding missing
-                 * fields with default values.
-                 * It throws if invalid.
-                 */
-                function validateSctpStreamParameters(params) {
-                    if (typeof params !== 'object') throw new TypeError('params is not an object');
-                    // streamId is mandatory.
-                    if (typeof params.streamId !== 'number') throw new TypeError('missing params.streamId');
-                    // ordered is optional.
-                    let orderedGiven = false;
-                    if (typeof params.ordered === 'boolean') orderedGiven = true;
-                    else params.ordered = true;
-                    // maxPacketLifeTime is optional.
-                    if (params.maxPacketLifeTime && typeof params.maxPacketLifeTime !== 'number')
-                        throw new TypeError('invalid params.maxPacketLifeTime');
-                    // maxRetransmits is optional.
-                    if (params.maxRetransmits && typeof params.maxRetransmits !== 'number')
-                        throw new TypeError('invalid params.maxRetransmits');
-                    if (params.maxPacketLifeTime && params.maxRetransmits)
-                        throw new TypeError('cannot provide both maxPacketLifeTime and maxRetransmits');
-                    if (orderedGiven && params.ordered && (params.maxPacketLifeTime || params.maxRetransmits)) {
-                        throw new TypeError('cannot be ordered with maxPacketLifeTime or maxRetransmits');
-                    } else if (!orderedGiven && (params.maxPacketLifeTime || params.maxRetransmits)) {
-                        params.ordered = false;
-                    }
-                    // priority is optional.
-                    if (params.priority && typeof params.priority !== 'string')
-                        throw new TypeError('invalid params.priority');
-                    // label is optional.
-                    if (params.label && typeof params.label !== 'string') throw new TypeError('invalid params.label');
-                    // protocol is optional.
-                    if (params.protocol && typeof params.protocol !== 'string')
-                        throw new TypeError('invalid params.protocol');
-                }
-                exports.validateSctpStreamParameters = validateSctpStreamParameters;
-                /**
-                 * Generate extended RTP capabilities for sending and receiving.
-                 */
-                function getExtendedRtpCapabilities(localCaps, remoteCaps) {
-                    const extendedRtpCapabilities = {
-                        codecs: [],
-                        headerExtensions: [],
-                    };
-                    // Match media codecs and keep the order preferred by remoteCaps.
-                    for (const remoteCodec of remoteCaps.codecs || []) {
-                        if (isRtxCodec(remoteCodec)) continue;
-                        const matchingLocalCodec = (localCaps.codecs || []).find((localCodec) =>
-                            matchCodecs(localCodec, remoteCodec, { strict: true, modify: true }),
-                        );
-                        if (!matchingLocalCodec) continue;
-                        const extendedCodec = {
-                            mimeType: matchingLocalCodec.mimeType,
-                            kind: matchingLocalCodec.kind,
-                            clockRate: matchingLocalCodec.clockRate,
-                            channels: matchingLocalCodec.channels,
-                            localPayloadType: matchingLocalCodec.preferredPayloadType,
-                            localRtxPayloadType: undefined,
-                            remotePayloadType: remoteCodec.preferredPayloadType,
-                            remoteRtxPayloadType: undefined,
-                            localParameters: matchingLocalCodec.parameters,
-                            remoteParameters: remoteCodec.parameters,
-                            rtcpFeedback: reduceRtcpFeedback(matchingLocalCodec, remoteCodec),
-                        };
-                        extendedRtpCapabilities.codecs.push(extendedCodec);
-                    }
-                    // Match RTX codecs.
-                    for (const extendedCodec of extendedRtpCapabilities.codecs) {
-                        const matchingLocalRtxCodec = localCaps.codecs.find(
-                            (localCodec) =>
-                                isRtxCodec(localCodec) && localCodec.parameters.apt === extendedCodec.localPayloadType,
-                        );
-                        const matchingRemoteRtxCodec = remoteCaps.codecs.find(
-                            (remoteCodec) =>
-                                isRtxCodec(remoteCodec) &&
-                                remoteCodec.parameters.apt === extendedCodec.remotePayloadType,
-                        );
-                        if (matchingLocalRtxCodec && matchingRemoteRtxCodec) {
-                            extendedCodec.localRtxPayloadType = matchingLocalRtxCodec.preferredPayloadType;
-                            extendedCodec.remoteRtxPayloadType = matchingRemoteRtxCodec.preferredPayloadType;
-                        }
-                    }
-                    // Match header extensions.
-                    for (const remoteExt of remoteCaps.headerExtensions) {
-                        const matchingLocalExt = localCaps.headerExtensions.find((localExt) =>
-                            matchHeaderExtensions(localExt, remoteExt),
-                        );
-                        if (!matchingLocalExt) continue;
-                        const extendedExt = {
-                            kind: remoteExt.kind,
-                            uri: remoteExt.uri,
-                            sendId: matchingLocalExt.preferredId,
-                            recvId: remoteExt.preferredId,
-                            encrypt: matchingLocalExt.preferredEncrypt,
-                            direction: 'sendrecv',
-                        };
-                        switch (remoteExt.direction) {
-                            case 'sendrecv':
-                                extendedExt.direction = 'sendrecv';
-                                break;
-                            case 'recvonly':
-                                extendedExt.direction = 'sendonly';
-                                break;
-                            case 'sendonly':
-                                extendedExt.direction = 'recvonly';
-                                break;
-                            case 'inactive':
-                                extendedExt.direction = 'inactive';
-                                break;
-                        }
-                        extendedRtpCapabilities.headerExtensions.push(extendedExt);
-                    }
-                    return extendedRtpCapabilities;
-                }
-                exports.getExtendedRtpCapabilities = getExtendedRtpCapabilities;
-                /**
-                 * Generate RTP capabilities for receiving media based on the given extended
-                 * RTP capabilities.
-                 */
-                function getRecvRtpCapabilities(extendedRtpCapabilities) {
-                    const rtpCapabilities = {
-                        codecs: [],
-                        headerExtensions: [],
-                    };
-                    for (const extendedCodec of extendedRtpCapabilities.codecs) {
-                        const codec = {
-                            mimeType: extendedCodec.mimeType,
-                            kind: extendedCodec.kind,
-                            preferredPayloadType: extendedCodec.remotePayloadType,
-                            clockRate: extendedCodec.clockRate,
-                            channels: extendedCodec.channels,
-                            parameters: extendedCodec.localParameters,
-                            rtcpFeedback: extendedCodec.rtcpFeedback,
-                        };
-                        rtpCapabilities.codecs.push(codec);
-                        // Add RTX codec.
-                        if (!extendedCodec.remoteRtxPayloadType) continue;
-                        const rtxCodec = {
-                            mimeType: `${extendedCodec.kind}/rtx`,
-                            kind: extendedCodec.kind,
-                            preferredPayloadType: extendedCodec.remoteRtxPayloadType,
-                            clockRate: extendedCodec.clockRate,
-                            parameters: {
-                                apt: extendedCodec.remotePayloadType,
-                            },
-                            rtcpFeedback: [],
-                        };
-                        rtpCapabilities.codecs.push(rtxCodec);
-                        // TODO: In the future, we need to add FEC, CN, etc, codecs.
-                    }
-                    for (const extendedExtension of extendedRtpCapabilities.headerExtensions) {
-                        // Ignore RTP extensions not valid for receiving.
-                        if (extendedExtension.direction !== 'sendrecv' && extendedExtension.direction !== 'recvonly') {
-                            continue;
-                        }
-                        const ext = {
-                            kind: extendedExtension.kind,
-                            uri: extendedExtension.uri,
-                            preferredId: extendedExtension.recvId,
-                            preferredEncrypt: extendedExtension.encrypt,
-                            direction: extendedExtension.direction,
-                        };
-                        rtpCapabilities.headerExtensions.push(ext);
-                    }
-                    return rtpCapabilities;
-                }
-                exports.getRecvRtpCapabilities = getRecvRtpCapabilities;
-                /**
-                 * Generate RTP parameters of the given kind for sending media.
-                 * NOTE: mid, encodings and rtcp fields are left empty.
-                 */
-                function getSendingRtpParameters(kind, extendedRtpCapabilities) {
-                    const rtpParameters = {
-                        mid: undefined,
-                        codecs: [],
-                        headerExtensions: [],
-                        encodings: [],
-                        rtcp: {},
-                    };
-                    for (const extendedCodec of extendedRtpCapabilities.codecs) {
-                        if (extendedCodec.kind !== kind) continue;
-                        const codec = {
-                            mimeType: extendedCodec.mimeType,
-                            payloadType: extendedCodec.localPayloadType,
-                            clockRate: extendedCodec.clockRate,
-                            channels: extendedCodec.channels,
-                            parameters: extendedCodec.localParameters,
-                            rtcpFeedback: extendedCodec.rtcpFeedback,
-                        };
-                        rtpParameters.codecs.push(codec);
-                        // Add RTX codec.
-                        if (extendedCodec.localRtxPayloadType) {
-                            const rtxCodec = {
-                                mimeType: `${extendedCodec.kind}/rtx`,
-                                payloadType: extendedCodec.localRtxPayloadType,
-                                clockRate: extendedCodec.clockRate,
-                                parameters: {
-                                    apt: extendedCodec.localPayloadType,
-                                },
-                                rtcpFeedback: [],
-                            };
-                            rtpParameters.codecs.push(rtxCodec);
-                        }
-                    }
-                    for (const extendedExtension of extendedRtpCapabilities.headerExtensions) {
-                        // Ignore RTP extensions of a different kind and those not valid for sending.
-                        if (
-                            (extendedExtension.kind && extendedExtension.kind !== kind) ||
-                            (extendedExtension.direction !== 'sendrecv' && extendedExtension.direction !== 'sendonly')
-                        ) {
-                            continue;
-                        }
-                        const ext = {
-                            uri: extendedExtension.uri,
-                            id: extendedExtension.sendId,
-                            encrypt: extendedExtension.encrypt,
-                            parameters: {},
-                        };
-                        rtpParameters.headerExtensions.push(ext);
-                    }
-                    return rtpParameters;
-                }
-                exports.getSendingRtpParameters = getSendingRtpParameters;
-                /**
-                 * Generate RTP parameters of the given kind suitable for the remote SDP answer.
-                 */
-                function getSendingRemoteRtpParameters(kind, extendedRtpCapabilities) {
-                    const rtpParameters = {
-                        mid: undefined,
-                        codecs: [],
-                        headerExtensions: [],
-                        encodings: [],
-                        rtcp: {},
-                    };
-                    for (const extendedCodec of extendedRtpCapabilities.codecs) {
-                        if (extendedCodec.kind !== kind) continue;
-                        const codec = {
-                            mimeType: extendedCodec.mimeType,
-                            payloadType: extendedCodec.localPayloadType,
-                            clockRate: extendedCodec.clockRate,
-                            channels: extendedCodec.channels,
-                            parameters: extendedCodec.remoteParameters,
-                            rtcpFeedback: extendedCodec.rtcpFeedback,
-                        };
-                        rtpParameters.codecs.push(codec);
-                        // Add RTX codec.
-                        if (extendedCodec.localRtxPayloadType) {
-                            const rtxCodec = {
-                                mimeType: `${extendedCodec.kind}/rtx`,
-                                payloadType: extendedCodec.localRtxPayloadType,
-                                clockRate: extendedCodec.clockRate,
-                                parameters: {
-                                    apt: extendedCodec.localPayloadType,
-                                },
-                                rtcpFeedback: [],
-                            };
-                            rtpParameters.codecs.push(rtxCodec);
-                        }
-                    }
-                    for (const extendedExtension of extendedRtpCapabilities.headerExtensions) {
-                        // Ignore RTP extensions of a different kind and those not valid for sending.
-                        if (
-                            (extendedExtension.kind && extendedExtension.kind !== kind) ||
-                            (extendedExtension.direction !== 'sendrecv' && extendedExtension.direction !== 'sendonly')
-                        ) {
-                            continue;
-                        }
-                        const ext = {
-                            uri: extendedExtension.uri,
-                            id: extendedExtension.sendId,
-                            encrypt: extendedExtension.encrypt,
-                            parameters: {},
+                audio: ortc.getSendingRemoteRtpParameters('audio', extendedRtpCapabilities),
+                video: ortc.getSendingRemoteRtpParameters('video', extendedRtpCapabilities)
+            };
+        this._pc = new RTCPeerConnection(Object.assign({ iceServers: iceServers || [], iceTransportPolicy: iceTransportPolicy || 'all', bundlePolicy: 'max-bundle', rtcpMuxPolicy: 'require', sdpSemantics: 'unified-plan' }, additionalSettings), proprietaryConstraints);
+        // Handle RTCPeerConnection connection status.
+        this._pc.addEventListener('iceconnectionstatechange', () => {
+            switch (this._pc.iceConnectionState) {
+                case 'checking':
+                    this.emit('@connectionstatechange', 'connecting');
+                    break;
+                case 'connected':
+                case 'completed':
+                    this.emit('@connectionstatechange', 'connected');
+                    break;
+                case 'failed':
+                    this.emit('@connectionstatechange', 'failed');
+                    break;
+                case 'disconnected':
+                    this.emit('@connectionstatechange', 'disconnected');
+                    break;
+                case 'closed':
+                    this.emit('@connectionstatechange', 'closed');
+                    break;
+            }
+        });
+    }
+    async updateIceServers(iceServers) {
+        logger.debug('updateIceServers()');
+        const configuration = this._pc.getConfiguration();
+        configuration.iceServers = iceServers;
+        this._pc.setConfiguration(configuration);
+    }
+    async restartIce(iceParameters) {
+        logger.debug('restartIce()');
+        // Provide the remote SDP handler with new remote ICE parameters.
+        this._remoteSdp.updateIceParameters(iceParameters);
+        if (!this._transportReady)
+            return;
+        if (this._direction === 'send') {
+            const offer = await this._pc.createOffer({ iceRestart: true });
+            logger.debug('restartIce() | calling pc.setLocalDescription() [offer:%o]', offer);
+            await this._pc.setLocalDescription(offer);
+            const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
+            logger.debug('restartIce() | calling pc.setRemoteDescription() [answer:%o]', answer);
+            await this._pc.setRemoteDescription(answer);
+        }
+        else {
+            const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
+            logger.debug('restartIce() | calling pc.setRemoteDescription() [offer:%o]', offer);
+            await this._pc.setRemoteDescription(offer);
+            const answer = await this._pc.createAnswer();
+            logger.debug('restartIce() | calling pc.setLocalDescription() [answer:%o]', answer);
+            await this._pc.setLocalDescription(answer);
+        }
+    }
+    async getTransportStats() {
+        return this._pc.getStats();
+    }
+    async send({ track, encodings, codecOptions, codec }) {
+        this._assertSendDirection();
+        logger.debug('send() [kind:%s, track.id:%s]', track.kind, track.id);
+        if (encodings && encodings.length > 1) {
+            encodings.forEach((encoding, idx) => {
+                encoding.rid = `r${idx}`;
+            });
+        }
+        const sendingRtpParameters = utils.clone(this._sendingRtpParametersByKind[track.kind], {});
+        // This may throw.
+        sendingRtpParameters.codecs =
+            ortc.reduceCodecs(sendingRtpParameters.codecs, codec);
+        const sendingRemoteRtpParameters = utils.clone(this._sendingRemoteRtpParametersByKind[track.kind], {});
+        // This may throw.
+        sendingRemoteRtpParameters.codecs =
+            ortc.reduceCodecs(sendingRemoteRtpParameters.codecs, codec);
+        const mediaSectionIdx = this._remoteSdp.getNextMediaSectionIdx();
+        const transceiver = this._pc.addTransceiver(track, {
+            direction: 'sendonly',
+            streams: [this._sendStream],
+            sendEncodings: encodings
+        });
+        let offer = await this._pc.createOffer();
+        let localSdpObject = sdpTransform.parse(offer.sdp);
+        let offerMediaObject;
+        if (!this._transportReady)
+            await this._setupTransport({ localDtlsRole: 'server', localSdpObject });
+        // Special case for VP9 with SVC.
+        let hackVp9Svc = false;
+        const layers = scalabilityModes_1.parse((encodings || [{}])[0].scalabilityMode);
+        if (encodings &&
+            encodings.length === 1 &&
+            layers.spatialLayers > 1 &&
+            sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/vp9') {
+            logger.debug('send() | enabling legacy simulcast for VP9 SVC');
+            hackVp9Svc = true;
+            localSdpObject = sdpTransform.parse(offer.sdp);
+            offerMediaObject = localSdpObject.media[mediaSectionIdx.idx];
+            sdpUnifiedPlanUtils.addLegacySimulcast({
+                offerMediaObject,
+                numStreams: layers.spatialLayers
+            });
+            offer = { type: 'offer', sdp: sdpTransform.write(localSdpObject) };
+        }
+        logger.debug('send() | calling pc.setLocalDescription() [offer:%o]', offer);
+        await this._pc.setLocalDescription(offer);
+        // We can now get the transceiver.mid.
+        const localId = transceiver.mid;
+        // Set MID.
+        sendingRtpParameters.mid = localId;
+        localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
+        offerMediaObject = localSdpObject.media[mediaSectionIdx.idx];
+        // Set RTCP CNAME.
+        sendingRtpParameters.rtcp.cname =
+            sdpCommonUtils.getCname({ offerMediaObject });
+        // Set RTP encodings by parsing the SDP offer if no encodings are given.
+        if (!encodings) {
+            sendingRtpParameters.encodings =
+                sdpUnifiedPlanUtils.getRtpEncodings({ offerMediaObject });
+        }
+        // Set RTP encodings by parsing the SDP offer and complete them with given
+        // one if just a single encoding has been given.
+        else if (encodings.length === 1) {
+            let newEncodings = sdpUnifiedPlanUtils.getRtpEncodings({ offerMediaObject });
+            Object.assign(newEncodings[0], encodings[0]);
+            // Hack for VP9 SVC.
+            if (hackVp9Svc)
+                newEncodings = [newEncodings[0]];
+            sendingRtpParameters.encodings = newEncodings;
+        }
+        // Otherwise if more than 1 encoding are given use them verbatim.
+        else {
+            sendingRtpParameters.encodings = encodings;
+        }
+        // If VP8 or H264 and there is effective simulcast, add scalabilityMode to
+        // each encoding.
+        if (sendingRtpParameters.encodings.length > 1 &&
+            (sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/vp8' ||
+                sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/h264')) {
+            for (const encoding of sendingRtpParameters.encodings) {
+                encoding.scalabilityMode = 'S1T3';
+            }
+        }
+        this._remoteSdp.send({
+            offerMediaObject,
+            reuseMid: mediaSectionIdx.reuseMid,
+            offerRtpParameters: sendingRtpParameters,
+            answerRtpParameters: sendingRemoteRtpParameters,
+            codecOptions,
+            extmapAllowMixed: true
+        });
+        const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
+        logger.debug('send() | calling pc.setRemoteDescription() [answer:%o]', answer);
+        await this._pc.setRemoteDescription(answer);
+        // Store in the map.
+        this._mapMidTransceiver.set(localId, transceiver);
+        return {
+            localId,
+            rtpParameters: sendingRtpParameters,
+            rtpSender: transceiver.sender
+        };
+    }
+    async stopSending(localId) {
+        this._assertSendDirection();
+        logger.debug('stopSending() [localId:%s]', localId);
+        const transceiver = this._mapMidTransceiver.get(localId);
+        if (!transceiver)
+            throw new Error('associated RTCRtpTransceiver not found');
+        transceiver.sender.replaceTrack(null);
+        this._pc.removeTrack(transceiver.sender);
+        this._remoteSdp.closeMediaSection(transceiver.mid);
+        const offer = await this._pc.createOffer();
+        logger.debug('stopSending() | calling pc.setLocalDescription() [offer:%o]', offer);
+        await this._pc.setLocalDescription(offer);
+        const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
+        logger.debug('stopSending() | calling pc.setRemoteDescription() [answer:%o]', answer);
+        await this._pc.setRemoteDescription(answer);
+    }
+    async replaceTrack(localId, track) {
+        this._assertSendDirection();
+        if (track) {
+            logger.debug('replaceTrack() [localId:%s, track.id:%s]', localId, track.id);
+        }
+        else {
+            logger.debug('replaceTrack() [localId:%s, no track]', localId);
+        }
+        const transceiver = this._mapMidTransceiver.get(localId);
+        if (!transceiver)
+            throw new Error('associated RTCRtpTransceiver not found');
+        await transceiver.sender.replaceTrack(track);
+    }
+    async setMaxSpatialLayer(localId, spatialLayer) {
+        this._assertSendDirection();
+        logger.debug('setMaxSpatialLayer() [localId:%s, spatialLayer:%s]', localId, spatialLayer);
+        const transceiver = this._mapMidTransceiver.get(localId);
+        if (!transceiver)
+            throw new Error('associated RTCRtpTransceiver not found');
+        const parameters = transceiver.sender.getParameters();
+        parameters.encodings.forEach((encoding, idx) => {
+            if (idx <= spatialLayer)
+                encoding.active = true;
+            else
+                encoding.active = false;
+        });
+        await transceiver.sender.setParameters(parameters);
+    }
+    async setRtpEncodingParameters(localId, params) {
+        this._assertSendDirection();
+        logger.debug('setRtpEncodingParameters() [localId:%s, params:%o]', localId, params);
+        const transceiver = this._mapMidTransceiver.get(localId);
+        if (!transceiver)
+            throw new Error('associated RTCRtpTransceiver not found');
+        const parameters = transceiver.sender.getParameters();
+        parameters.encodings.forEach((encoding, idx) => {
+            parameters.encodings[idx] = Object.assign(Object.assign({}, encoding), params);
+        });
+        await transceiver.sender.setParameters(parameters);
+    }
+    async getSenderStats(localId) {
+        this._assertSendDirection();
+        const transceiver = this._mapMidTransceiver.get(localId);
+        if (!transceiver)
+            throw new Error('associated RTCRtpTransceiver not found');
+        return transceiver.sender.getStats();
+    }
+    async sendDataChannel({ ordered, maxPacketLifeTime, maxRetransmits, label, protocol }) {
+        this._assertSendDirection();
+        const options = {
+            negotiated: true,
+            id: this._nextSendSctpStreamId,
+            ordered,
+            maxPacketLifeTime,
+            maxRetransmits,
+            protocol
+        };
+        logger.debug('sendDataChannel() [options:%o]', options);
+        const dataChannel = this._pc.createDataChannel(label, options);
+        // Increase next id.
+        this._nextSendSctpStreamId =
+            ++this._nextSendSctpStreamId % SCTP_NUM_STREAMS.MIS;
+        // If this is the first DataChannel we need to create the SDP answer with
+        // m=application section.
+        if (!this._hasDataChannelMediaSection) {
+            const offer = await this._pc.createOffer();
+            const localSdpObject = sdpTransform.parse(offer.sdp);
+            const offerMediaObject = localSdpObject.media
+                .find((m) => m.type === 'application');
+            if (!this._transportReady)
+                await this._setupTransport({ localDtlsRole: 'server', localSdpObject });
+            logger.debug('sendDataChannel() | calling pc.setLocalDescription() [offer:%o]', offer);
+            await this._pc.setLocalDescription(offer);
+            this._remoteSdp.sendSctpAssociation({ offerMediaObject });
+            const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
+            logger.debug('sendDataChannel() | calling pc.setRemoteDescription() [answer:%o]', answer);
+            await this._pc.setRemoteDescription(answer);
+            this._hasDataChannelMediaSection = true;
+        }
+        const sctpStreamParameters = {
+            streamId: options.id,
+            ordered: options.ordered,
+            maxPacketLifeTime: options.maxPacketLifeTime,
+            maxRetransmits: options.maxRetransmits
+        };
+        return { dataChannel, sctpStreamParameters };
+    }
+    async receive({ trackId, kind, rtpParameters }) {
+        this._assertRecvDirection();
+        logger.debug('receive() [trackId:%s, kind:%s]', trackId, kind);
+        const localId = rtpParameters.mid || String(this._mapMidTransceiver.size);
+        this._remoteSdp.receive({
+            mid: localId,
+            kind,
+            offerRtpParameters: rtpParameters,
+            streamId: rtpParameters.rtcp.cname,
+            trackId
+        });
+        const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
+        logger.debug('receive() | calling pc.setRemoteDescription() [offer:%o]', offer);
+        await this._pc.setRemoteDescription(offer);
+        let answer = await this._pc.createAnswer();
+        const localSdpObject = sdpTransform.parse(answer.sdp);
+        const answerMediaObject = localSdpObject.media
+            .find((m) => String(m.mid) === localId);
+        // May need to modify codec parameters in the answer based on codec
+        // parameters in the offer.
+        sdpCommonUtils.applyCodecParameters({
+            offerRtpParameters: rtpParameters,
+            answerMediaObject
+        });
+        answer = { type: 'answer', sdp: sdpTransform.write(localSdpObject) };
+        if (!this._transportReady)
+            await this._setupTransport({ localDtlsRole: 'client', localSdpObject });
+        logger.debug('receive() | calling pc.setLocalDescription() [answer:%o]', answer);
+        await this._pc.setLocalDescription(answer);
+        const transceiver = this._pc.getTransceivers()
+            .find((t) => t.mid === localId);
+        if (!transceiver)
+            throw new Error('new RTCRtpTransceiver not found');
+        // Store in the map.
+        this._mapMidTransceiver.set(localId, transceiver);
+        return {
+            localId,
+            track: transceiver.receiver.track,
+            rtpReceiver: transceiver.receiver
+        };
+    }
+    async stopReceiving(localId) {
+        this._assertRecvDirection();
+        logger.debug('stopReceiving() [localId:%s]', localId);
+        const transceiver = this._mapMidTransceiver.get(localId);
+        if (!transceiver)
+            throw new Error('associated RTCRtpTransceiver not found');
+        this._remoteSdp.closeMediaSection(transceiver.mid);
+        const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
+        logger.debug('stopReceiving() | calling pc.setRemoteDescription() [offer:%o]', offer);
+        await this._pc.setRemoteDescription(offer);
+        const answer = await this._pc.createAnswer();
+        logger.debug('stopReceiving() | calling pc.setLocalDescription() [answer:%o]', answer);
+        await this._pc.setLocalDescription(answer);
+    }
+    async getReceiverStats(localId) {
+        this._assertRecvDirection();
+        const transceiver = this._mapMidTransceiver.get(localId);
+        if (!transceiver)
+            throw new Error('associated RTCRtpTransceiver not found');
+        return transceiver.receiver.getStats();
+    }
+    async receiveDataChannel({ sctpStreamParameters, label, protocol }) {
+        this._assertRecvDirection();
+        const { streamId, ordered, maxPacketLifeTime, maxRetransmits } = sctpStreamParameters;
+        const options = {
+            negotiated: true,
+            id: streamId,
+            ordered,
+            maxPacketLifeTime,
+            maxRetransmits,
+            protocol
+        };
+        logger.debug('receiveDataChannel() [options:%o]', options);
+        const dataChannel = this._pc.createDataChannel(label, options);
+        // If this is the first DataChannel we need to create the SDP offer with
+        // m=application section.
+        if (!this._hasDataChannelMediaSection) {
+            this._remoteSdp.receiveSctpAssociation();
+            const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
+            logger.debug('receiveDataChannel() | calling pc.setRemoteDescription() [offer:%o]', offer);
+            await this._pc.setRemoteDescription(offer);
+            const answer = await this._pc.createAnswer();
+            if (!this._transportReady) {
+                const localSdpObject = sdpTransform.parse(answer.sdp);
+                await this._setupTransport({ localDtlsRole: 'client', localSdpObject });
+            }
+            logger.debug('receiveDataChannel() | calling pc.setRemoteDescription() [answer:%o]', answer);
+            await this._pc.setLocalDescription(answer);
+            this._hasDataChannelMediaSection = true;
+        }
+        return { dataChannel };
+    }
+    async _setupTransport({ localDtlsRole, localSdpObject }) {
+        if (!localSdpObject)
+            localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
+        // Get our local DTLS parameters.
+        const dtlsParameters = sdpCommonUtils.extractDtlsParameters({ sdpObject: localSdpObject });
+        // Set our DTLS role.
+        dtlsParameters.role = localDtlsRole;
+        // Update the remote DTLS role in the SDP.
+        this._remoteSdp.updateDtlsRole(localDtlsRole === 'client' ? 'server' : 'client');
+        // Need to tell the remote transport about our parameters.
+        await this.safeEmitAsPromise('@connect', { dtlsParameters });
+        this._transportReady = true;
+    }
+    _assertSendDirection() {
+        if (this._direction !== 'send') {
+            throw new Error('method can just be called for handlers with "send" direction');
+        }
+    }
+    _assertRecvDirection() {
+        if (this._direction !== 'recv') {
+            throw new Error('method can just be called for handlers with "recv" direction');
+        }
+    }
+}
+exports.Chrome74 = Chrome74;
+
+},{"../Logger":13,"../ortc":36,"../scalabilityModes":37,"../utils":39,"./HandlerInterface":25,"./sdp/RemoteSdp":31,"./sdp/commonUtils":32,"./sdp/unifiedPlanUtils":34,"sdp-transform":44}],23:[function(require,module,exports){
+"use strict";
+var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
+}) : (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    o[k2] = m[k];
+}));
+var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
+    Object.defineProperty(o, "default", { enumerable: true, value: v });
+}) : function(o, v) {
+    o["default"] = v;
+});
+var __importStar = (this && this.__importStar) || function (mod) {
+    if (mod && mod.__esModule) return mod;
+    var result = {};
+    if (mod != null) for (var k in mod) if (k !== "default" && Object.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
+    __setModuleDefault(result, mod);
+    return result;
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.Edge11 = void 0;
+const Logger_1 = require("../Logger");
+const errors_1 = require("../errors");
+const utils = __importStar(require("../utils"));
+const ortc = __importStar(require("../ortc"));
+const edgeUtils = __importStar(require("./ortc/edgeUtils"));
+const HandlerInterface_1 = require("./HandlerInterface");
+const logger = new Logger_1.Logger('Edge11');
+class Edge11 extends HandlerInterface_1.HandlerInterface {
+    constructor() {
+        super();
+        // Map of RTCRtpSenders indexed by id.
+        this._rtpSenders = new Map();
+        // Map of RTCRtpReceivers indexed by id.
+        this._rtpReceivers = new Map();
+        // Next localId for sending tracks.
+        this._nextSendLocalId = 0;
+        // Got transport local and remote parameters.
+        this._transportReady = false;
+    }
+    /**
+     * Creates a factory function.
+     */
+    static createFactory() {
+        return () => new Edge11();
+    }
+    get name() {
+        return 'Edge11';
+    }
+    close() {
+        logger.debug('close()');
+        // Close the ICE gatherer.
+        // NOTE: Not yet implemented by Edge.
+        try {
+            this._iceGatherer.close();
+        }
+        catch (error) { }
+        // Close the ICE transport.
+        try {
+            this._iceTransport.stop();
+        }
+        catch (error) { }
+        // Close the DTLS transport.
+        try {
+            this._dtlsTransport.stop();
+        }
+        catch (error) { }
+        // Close RTCRtpSenders.
+        for (const rtpSender of this._rtpSenders.values()) {
+            try {
+                rtpSender.stop();
+            }
+            catch (error) { }
+        }
+        // Close RTCRtpReceivers.
+        for (const rtpReceiver of this._rtpReceivers.values()) {
+            try {
+                rtpReceiver.stop();
+            }
+            catch (error) { }
+        }
+    }
+    async getNativeRtpCapabilities() {
+        logger.debug('getNativeRtpCapabilities()');
+        return edgeUtils.getCapabilities();
+    }
+    async getNativeSctpCapabilities() {
+        logger.debug('getNativeSctpCapabilities()');
+        return {
+            numStreams: { OS: 0, MIS: 0 }
+        };
+    }
+    run({ direction, // eslint-disable-line @typescript-eslint/no-unused-vars
+    iceParameters, iceCandidates, dtlsParameters, sctpParameters, // eslint-disable-line @typescript-eslint/no-unused-vars
+    iceServers, iceTransportPolicy, additionalSettings, // eslint-disable-line @typescript-eslint/no-unused-vars
+    proprietaryConstraints, // eslint-disable-line @typescript-eslint/no-unused-vars
+    extendedRtpCapabilities }) {
+        logger.debug('run()');
+        this._sendingRtpParametersByKind =
+            {
+                audio: ortc.getSendingRtpParameters('audio', extendedRtpCapabilities),
+                video: ortc.getSendingRtpParameters('video', extendedRtpCapabilities)
+            };
+        this._remoteIceParameters = iceParameters;
+        this._remoteIceCandidates = iceCandidates;
+        this._remoteDtlsParameters = dtlsParameters;
+        this._cname = `CNAME-${utils.generateRandomNumber()}`;
+        this._setIceGatherer({ iceServers, iceTransportPolicy });
+        this._setIceTransport();
+        this._setDtlsTransport();
+    }
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    async updateIceServers(iceServers) {
+        // NOTE: Edge 11 does not implement iceGatherer.gater().
+        throw new errors_1.UnsupportedError('not supported');
+    }
+    async restartIce(iceParameters) {
+        logger.debug('restartIce()');
+        this._remoteIceParameters = iceParameters;
+        if (!this._transportReady)
+            return;
+        logger.debug('restartIce() | calling iceTransport.start()');
+        this._iceTransport.start(this._iceGatherer, iceParameters, 'controlling');
+        for (const candidate of this._remoteIceCandidates) {
+            this._iceTransport.addRemoteCandidate(candidate);
+        }
+        this._iceTransport.addRemoteCandidate({});
+    }
+    async getTransportStats() {
+        return this._iceTransport.getStats();
+    }
+    async send(
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    { track, encodings, codecOptions, codec }) {
+        logger.debug('send() [kind:%s, track.id:%s]', track.kind, track.id);
+        if (!this._transportReady)
+            await this._setupTransport({ localDtlsRole: 'server' });
+        logger.debug('send() | calling new RTCRtpSender()');
+        const rtpSender = new RTCRtpSender(track, this._dtlsTransport);
+        const rtpParameters = utils.clone(this._sendingRtpParametersByKind[track.kind], {});
+        rtpParameters.codecs = ortc.reduceCodecs(rtpParameters.codecs, codec);
+        const useRtx = rtpParameters.codecs
+            .some((_codec) => /.+\/rtx$/i.test(_codec.mimeType));
+        if (!encodings)
+            encodings = [{}];
+        for (const encoding of encodings) {
+            encoding.ssrc = utils.generateRandomNumber();
+            if (useRtx)
+                encoding.rtx = { ssrc: utils.generateRandomNumber() };
+        }
+        rtpParameters.encodings = encodings;
+        // Fill RTCRtpParameters.rtcp.
+        rtpParameters.rtcp =
+            {
+                cname: this._cname,
+                reducedSize: true,
+                mux: true
+            };
+        // NOTE: Convert our standard RTCRtpParameters into those that Edge
+        // expects.
+        const edgeRtpParameters = edgeUtils.mangleRtpParameters(rtpParameters);
+        logger.debug('send() | calling rtpSender.send() [params:%o]', edgeRtpParameters);
+        await rtpSender.send(edgeRtpParameters);
+        const localId = String(this._nextSendLocalId);
+        this._nextSendLocalId++;
+        // Store it.
+        this._rtpSenders.set(localId, rtpSender);
+        return { localId, rtpParameters, rtpSender };
+    }
+    async stopSending(localId) {
+        logger.debug('stopSending() [localId:%s]', localId);
+        const rtpSender = this._rtpSenders.get(localId);
+        if (!rtpSender)
+            throw new Error('RTCRtpSender not found');
+        this._rtpSenders.delete(localId);
+        try {
+            logger.debug('stopSending() | calling rtpSender.stop()');
+            rtpSender.stop();
+        }
+        catch (error) {
+            logger.warn('stopSending() | rtpSender.stop() failed:%o', error);
+            throw error;
+        }
+    }
+    async replaceTrack(localId, track) {
+        if (track) {
+            logger.debug('replaceTrack() [localId:%s, track.id:%s]', localId, track.id);
+        }
+        else {
+            logger.debug('replaceTrack() [localId:%s, no track]', localId);
+        }
+        const rtpSender = this._rtpSenders.get(localId);
+        if (!rtpSender)
+            throw new Error('RTCRtpSender not found');
+        rtpSender.setTrack(track);
+    }
+    async setMaxSpatialLayer(localId, spatialLayer) {
+        logger.debug('setMaxSpatialLayer() [localId:%s, spatialLayer:%s]', localId, spatialLayer);
+        const rtpSender = this._rtpSenders.get(localId);
+        if (!rtpSender)
+            throw new Error('RTCRtpSender not found');
+        const parameters = rtpSender.getParameters();
+        parameters.encodings
+            .forEach((encoding, idx) => {
+            if (idx <= spatialLayer)
+                encoding.active = true;
+            else
+                encoding.active = false;
+        });
+        await rtpSender.setParameters(parameters);
+    }
+    async setRtpEncodingParameters(localId, params) {
+        logger.debug('setRtpEncodingParameters() [localId:%s, params:%o]', localId, params);
+        const rtpSender = this._rtpSenders.get(localId);
+        if (!rtpSender)
+            throw new Error('RTCRtpSender not found');
+        const parameters = rtpSender.getParameters();
+        parameters.encodings.forEach((encoding, idx) => {
+            parameters.encodings[idx] = Object.assign(Object.assign({}, encoding), params);
+        });
+        await rtpSender.setParameters(parameters);
+    }
+    async getSenderStats(localId) {
+        const rtpSender = this._rtpSenders.get(localId);
+        if (!rtpSender)
+            throw new Error('RTCRtpSender not found');
+        return rtpSender.getStats();
+    }
+    async sendDataChannel(
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    options) {
+        throw new errors_1.UnsupportedError('not implemented');
+    }
+    async receive({ trackId, kind, rtpParameters }) {
+        logger.debug('receive() [trackId:%s, kind:%s]', trackId, kind);
+        if (!this._transportReady)
+            await this._setupTransport({ localDtlsRole: 'server' });
+        logger.debug('receive() | calling new RTCRtpReceiver()');
+        const rtpReceiver = new RTCRtpReceiver(this._dtlsTransport, kind);
+        rtpReceiver.addEventListener('error', (event) => {
+            logger.error('rtpReceiver "error" event [event:%o]', event);
+        });
+        // NOTE: Convert our standard RTCRtpParameters into those that Edge
+        // expects.
+        const edgeRtpParameters = edgeUtils.mangleRtpParameters(rtpParameters);
+        logger.debug('receive() | calling rtpReceiver.receive() [params:%o]', edgeRtpParameters);
+        await rtpReceiver.receive(edgeRtpParameters);
+        const localId = trackId;
+        // Store it.
+        this._rtpReceivers.set(localId, rtpReceiver);
+        return {
+            localId,
+            track: rtpReceiver.track,
+            rtpReceiver
+        };
+    }
+    async stopReceiving(localId) {
+        logger.debug('stopReceiving() [localId:%s]', localId);
+        const rtpReceiver = this._rtpReceivers.get(localId);
+        if (!rtpReceiver)
+            throw new Error('RTCRtpReceiver not found');
+        this._rtpReceivers.delete(localId);
+        try {
+            logger.debug('stopReceiving() | calling rtpReceiver.stop()');
+            rtpReceiver.stop();
+        }
+        catch (error) {
+            logger.warn('stopReceiving() | rtpReceiver.stop() failed:%o', error);
+        }
+    }
+    async getReceiverStats(localId) {
+        const rtpReceiver = this._rtpReceivers.get(localId);
+        if (!rtpReceiver)
+            throw new Error('RTCRtpReceiver not found');
+        return rtpReceiver.getStats();
+    }
+    async receiveDataChannel(
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    options) {
+        throw new errors_1.UnsupportedError('not implemented');
+    }
+    _setIceGatherer({ iceServers, iceTransportPolicy }) {
+        const iceGatherer = new RTCIceGatherer({
+            iceServers: iceServers || [],
+            gatherPolicy: iceTransportPolicy || 'all'
+        });
+        iceGatherer.addEventListener('error', (event) => {
+            logger.error('iceGatherer "error" event [event:%o]', event);
+        });
+        // NOTE: Not yet implemented by Edge, which starts gathering automatically.
+        try {
+            iceGatherer.gather();
+        }
+        catch (error) {
+            logger.debug('_setIceGatherer() | iceGatherer.gather() failed: %s', error.toString());
+        }
+        this._iceGatherer = iceGatherer;
+    }
+    _setIceTransport() {
+        const iceTransport = new RTCIceTransport(this._iceGatherer);
+        // NOTE: Not yet implemented by Edge.
+        iceTransport.addEventListener('statechange', () => {
+            switch (iceTransport.state) {
+                case 'checking':
+                    this.emit('@connectionstatechange', 'connecting');
+                    break;
+                case 'connected':
+                case 'completed':
+                    this.emit('@connectionstatechange', 'connected');
+                    break;
+                case 'failed':
+                    this.emit('@connectionstatechange', 'failed');
+                    break;
+                case 'disconnected':
+                    this.emit('@connectionstatechange', 'disconnected');
+                    break;
+                case 'closed':
+                    this.emit('@connectionstatechange', 'closed');
+                    break;
+            }
+        });
+        // NOTE: Not standard, but implemented by Edge.
+        iceTransport.addEventListener('icestatechange', () => {
+            switch (iceTransport.state) {
+                case 'checking':
+                    this.emit('@connectionstatechange', 'connecting');
+                    break;
+                case 'connected':
+                case 'completed':
+                    this.emit('@connectionstatechange', 'connected');
+                    break;
+                case 'failed':
+                    this.emit('@connectionstatechange', 'failed');
+                    break;
+                case 'disconnected':
+                    this.emit('@connectionstatechange', 'disconnected');
+                    break;
+                case 'closed':
+                    this.emit('@connectionstatechange', 'closed');
+                    break;
+            }
+        });
+        iceTransport.addEventListener('candidatepairchange', (event) => {
+            logger.debug('iceTransport "candidatepairchange" event [pair:%o]', event.pair);
+        });
+        this._iceTransport = iceTransport;
+    }
+    _setDtlsTransport() {
+        const dtlsTransport = new RTCDtlsTransport(this._iceTransport);
+        // NOTE: Not yet implemented by Edge.
+        dtlsTransport.addEventListener('statechange', () => {
+            logger.debug('dtlsTransport "statechange" event [state:%s]', dtlsTransport.state);
+        });
+        // NOTE: Not standard, but implemented by Edge.
+        dtlsTransport.addEventListener('dtlsstatechange', () => {
+            logger.debug('dtlsTransport "dtlsstatechange" event [state:%s]', dtlsTransport.state);
+            if (dtlsTransport.state === 'closed')
+                this.emit('@connectionstatechange', 'closed');
+        });
+        dtlsTransport.addEventListener('error', (event) => {
+            logger.error('dtlsTransport "error" event [event:%o]', event);
+        });
+        this._dtlsTransport = dtlsTransport;
+    }
+    async _setupTransport({ localDtlsRole }) {
+        logger.debug('_setupTransport()');
+        // Get our local DTLS parameters.
+        const dtlsParameters = this._dtlsTransport.getLocalParameters();
+        dtlsParameters.role = localDtlsRole;
+        // Need to tell the remote transport about our parameters.
+        await this.safeEmitAsPromise('@connect', { dtlsParameters });
+        // Start the RTCIceTransport.
+        this._iceTransport.start(this._iceGatherer, this._remoteIceParameters, 'controlling');
+        // Add remote ICE candidates.
+        for (const candidate of this._remoteIceCandidates) {
+            this._iceTransport.addRemoteCandidate(candidate);
+        }
+        // Also signal a 'complete' candidate as per spec.
+        // NOTE: It should be {complete: true} but Edge prefers {}.
+        // NOTE: If we don't signal end of candidates, the Edge RTCIceTransport
+        // won't enter the 'completed' state.
+        this._iceTransport.addRemoteCandidate({});
+        // NOTE: Edge does not like SHA less than 256.
+        this._remoteDtlsParameters.fingerprints = this._remoteDtlsParameters.fingerprints
+            .filter((fingerprint) => {
+            return (fingerprint.algorithm === 'sha-256' ||
+                fingerprint.algorithm === 'sha-384' ||
+                fingerprint.algorithm === 'sha-512');
+        });
+        // Start the RTCDtlsTransport.
+        this._dtlsTransport.start(this._remoteDtlsParameters);
+        this._transportReady = true;
+    }
+}
+exports.Edge11 = Edge11;
+
+},{"../Logger":13,"../errors":18,"../ortc":36,"../utils":39,"./HandlerInterface":25,"./ortc/edgeUtils":29}],24:[function(require,module,exports){
+"use strict";
+var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
+}) : (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    o[k2] = m[k];
+}));
+var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
+    Object.defineProperty(o, "default", { enumerable: true, value: v });
+}) : function(o, v) {
+    o["default"] = v;
+});
+var __importStar = (this && this.__importStar) || function (mod) {
+    if (mod && mod.__esModule) return mod;
+    var result = {};
+    if (mod != null) for (var k in mod) if (k !== "default" && Object.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
+    __setModuleDefault(result, mod);
+    return result;
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.Firefox60 = void 0;
+const sdpTransform = __importStar(require("sdp-transform"));
+const Logger_1 = require("../Logger");
+const errors_1 = require("../errors");
+const utils = __importStar(require("../utils"));
+const ortc = __importStar(require("../ortc"));
+const sdpCommonUtils = __importStar(require("./sdp/commonUtils"));
+const sdpUnifiedPlanUtils = __importStar(require("./sdp/unifiedPlanUtils"));
+const HandlerInterface_1 = require("./HandlerInterface");
+const RemoteSdp_1 = require("./sdp/RemoteSdp");
+const logger = new Logger_1.Logger('Firefox60');
+const SCTP_NUM_STREAMS = { OS: 16, MIS: 2048 };
+class Firefox60 extends HandlerInterface_1.HandlerInterface {
+    constructor() {
+        super();
+        // Map of RTCTransceivers indexed by MID.
+        this._mapMidTransceiver = new Map();
+        // Local stream for sending.
+        this._sendStream = new MediaStream();
+        // Whether a DataChannel m=application section has been created.
+        this._hasDataChannelMediaSection = false;
+        // Sending DataChannel id value counter. Incremented for each new DataChannel.
+        this._nextSendSctpStreamId = 0;
+        // Got transport local and remote parameters.
+        this._transportReady = false;
+    }
+    /**
+     * Creates a factory function.
+     */
+    static createFactory() {
+        return () => new Firefox60();
+    }
+    get name() {
+        return 'Firefox60';
+    }
+    close() {
+        logger.debug('close()');
+        // Close RTCPeerConnection.
+        if (this._pc) {
+            try {
+                this._pc.close();
+            }
+            catch (error) { }
+        }
+    }
+    async getNativeRtpCapabilities() {
+        logger.debug('getNativeRtpCapabilities()');
+        const pc = new RTCPeerConnection({
+            iceServers: [],
+            iceTransportPolicy: 'all',
+            bundlePolicy: 'max-bundle',
+            rtcpMuxPolicy: 'require'
+        });
+        // NOTE: We need to add a real video track to get the RID extension mapping.
+        const canvas = document.createElement('canvas');
+        // NOTE: Otherwise Firefox fails in next line.
+        canvas.getContext('2d');
+        const fakeStream = canvas.captureStream();
+        const fakeVideoTrack = fakeStream.getVideoTracks()[0];
+        try {
+            pc.addTransceiver('audio', { direction: 'sendrecv' });
+            const videoTransceiver = pc.addTransceiver(fakeVideoTrack, { direction: 'sendrecv' });
+            const parameters = videoTransceiver.sender.getParameters();
+            const encodings = [
+                { rid: 'r0', maxBitrate: 100000 },
+                { rid: 'r1', maxBitrate: 500000 }
+            ];
+            parameters.encodings = encodings;
+            await videoTransceiver.sender.setParameters(parameters);
+            const offer = await pc.createOffer();
+            try {
+                canvas.remove();
+            }
+            catch (error) { }
+            try {
+                fakeVideoTrack.stop();
+            }
+            catch (error) { }
+            try {
+                pc.close();
+            }
+            catch (error) { }
+            const sdpObject = sdpTransform.parse(offer.sdp);
+            const nativeRtpCapabilities = sdpCommonUtils.extractRtpCapabilities({ sdpObject });
+            return nativeRtpCapabilities;
+        }
+        catch (error) {
+            try {
+                canvas.remove();
+            }
+            catch (error2) { }
+            try {
+                fakeVideoTrack.stop();
+            }
+            catch (error2) { }
+            try {
+                pc.close();
+            }
+            catch (error2) { }
+            throw error;
+        }
+    }
+    async getNativeSctpCapabilities() {
+        logger.debug('getNativeSctpCapabilities()');
+        return {
+            numStreams: SCTP_NUM_STREAMS
+        };
+    }
+    run({ direction, iceParameters, iceCandidates, dtlsParameters, sctpParameters, iceServers, iceTransportPolicy, additionalSettings, proprietaryConstraints, extendedRtpCapabilities }) {
+        logger.debug('run()');
+        this._direction = direction;
+        this._remoteSdp = new RemoteSdp_1.RemoteSdp({
+            iceParameters,
+            iceCandidates,
+            dtlsParameters,
+            sctpParameters
+        });
+        this._sendingRtpParametersByKind =
+            {
+                audio: ortc.getSendingRtpParameters('audio', extendedRtpCapabilities),
+                video: ortc.getSendingRtpParameters('video', extendedRtpCapabilities)
+            };
+        this._sendingRemoteRtpParametersByKind =
+            {
+                audio: ortc.getSendingRemoteRtpParameters('audio', extendedRtpCapabilities),
+                video: ortc.getSendingRemoteRtpParameters('video', extendedRtpCapabilities)
+            };
+        this._pc = new RTCPeerConnection(Object.assign({ iceServers: iceServers || [], iceTransportPolicy: iceTransportPolicy || 'all', bundlePolicy: 'max-bundle', rtcpMuxPolicy: 'require' }, additionalSettings), proprietaryConstraints);
+        // Handle RTCPeerConnection connection status.
+        this._pc.addEventListener('iceconnectionstatechange', () => {
+            switch (this._pc.iceConnectionState) {
+                case 'checking':
+                    this.emit('@connectionstatechange', 'connecting');
+                    break;
+                case 'connected':
+                case 'completed':
+                    this.emit('@connectionstatechange', 'connected');
+                    break;
+                case 'failed':
+                    this.emit('@connectionstatechange', 'failed');
+                    break;
+                case 'disconnected':
+                    this.emit('@connectionstatechange', 'disconnected');
+                    break;
+                case 'closed':
+                    this.emit('@connectionstatechange', 'closed');
+                    break;
+            }
+        });
+    }
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    async updateIceServers(iceServers) {
+        // NOTE: Firefox does not implement pc.setConfiguration().
+        throw new errors_1.UnsupportedError('not supported');
+    }
+    async restartIce(iceParameters) {
+        logger.debug('restartIce()');
+        // Provide the remote SDP handler with new remote ICE parameters.
+        this._remoteSdp.updateIceParameters(iceParameters);
+        if (!this._transportReady)
+            return;
+        if (this._direction === 'send') {
+            const offer = await this._pc.createOffer({ iceRestart: true });
+            logger.debug('restartIce() | calling pc.setLocalDescription() [offer:%o]', offer);
+            await this._pc.setLocalDescription(offer);
+            const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
+            logger.debug('restartIce() | calling pc.setRemoteDescription() [answer:%o]', answer);
+            await this._pc.setRemoteDescription(answer);
+        }
+        else {
+            const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
+            logger.debug('restartIce() | calling pc.setRemoteDescription() [offer:%o]', offer);
+            await this._pc.setRemoteDescription(offer);
+            const answer = await this._pc.createAnswer();
+            logger.debug('restartIce() | calling pc.setLocalDescription() [answer:%o]', answer);
+            await this._pc.setLocalDescription(answer);
+        }
+    }
+    async getTransportStats() {
+        return this._pc.getStats();
+    }
+    async send({ track, encodings, codecOptions, codec }) {
+        this._assertSendDirection();
+        logger.debug('send() [kind:%s, track.id:%s]', track.kind, track.id);
+        if (encodings) {
+            encodings = utils.clone(encodings, []);
+            if (encodings.length > 1) {
+                encodings.forEach((encoding, idx) => {
+                    encoding.rid = `r${idx}`;
+                });
+                // Clone the encodings and reverse them because Firefox likes them
+                // from high to low.
+                encodings.reverse();
+            }
+        }
+        const sendingRtpParameters = utils.clone(this._sendingRtpParametersByKind[track.kind], {});
+        // This may throw.
+        sendingRtpParameters.codecs =
+            ortc.reduceCodecs(sendingRtpParameters.codecs, codec);
+        const sendingRemoteRtpParameters = utils.clone(this._sendingRemoteRtpParametersByKind[track.kind], {});
+        // This may throw.
+        sendingRemoteRtpParameters.codecs =
+            ortc.reduceCodecs(sendingRemoteRtpParameters.codecs, codec);
+        // NOTE: Firefox fails sometimes to properly anticipate the closed media
+        // section that it should use, so don't reuse closed media sections.
+        //   https://github.com/versatica/mediasoup-client/issues/104
+        //
+        // const mediaSectionIdx = this._remoteSdp!.getNextMediaSectionIdx();
+        const transceiver = this._pc.addTransceiver(track, { direction: 'sendonly', streams: [this._sendStream] });
+        // NOTE: This is not spec compliants. Encodings should be given in addTransceiver
+        // second argument, but Firefox does not support it.
+        if (encodings) {
+            const parameters = transceiver.sender.getParameters();
+            parameters.encodings = encodings;
+            await transceiver.sender.setParameters(parameters);
+        }
+        const offer = await this._pc.createOffer();
+        let localSdpObject = sdpTransform.parse(offer.sdp);
+        // In Firefox use DTLS role client even if we are the "offerer" since
+        // Firefox does not respect ICE-Lite.
+        if (!this._transportReady)
+            await this._setupTransport({ localDtlsRole: 'client', localSdpObject });
+        logger.debug('send() | calling pc.setLocalDescription() [offer:%o]', offer);
+        await this._pc.setLocalDescription(offer);
+        // We can now get the transceiver.mid.
+        const localId = transceiver.mid;
+        // Set MID.
+        sendingRtpParameters.mid = localId;
+        localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
+        const offerMediaObject = localSdpObject.media[localSdpObject.media.length - 1];
+        // Set RTCP CNAME.
+        sendingRtpParameters.rtcp.cname =
+            sdpCommonUtils.getCname({ offerMediaObject });
+        // Set RTP encodings by parsing the SDP offer if no encodings are given.
+        if (!encodings) {
+            sendingRtpParameters.encodings =
+                sdpUnifiedPlanUtils.getRtpEncodings({ offerMediaObject });
+        }
+        // Set RTP encodings by parsing the SDP offer and complete them with given
+        // one if just a single encoding has been given.
+        else if (encodings.length === 1) {
+            const newEncodings = sdpUnifiedPlanUtils.getRtpEncodings({ offerMediaObject });
+            Object.assign(newEncodings[0], encodings[0]);
+            sendingRtpParameters.encodings = newEncodings;
+        }
+        // Otherwise if more than 1 encoding are given use them verbatim (but
+        // reverse them back since we reversed them above to satisfy Firefox).
+        else {
+            sendingRtpParameters.encodings = encodings.reverse();
+        }
+        // If VP8 or H264 and there is effective simulcast, add scalabilityMode to
+        // each encoding.
+        if (sendingRtpParameters.encodings.length > 1 &&
+            (sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/vp8' ||
+                sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/h264')) {
+            for (const encoding of sendingRtpParameters.encodings) {
+                encoding.scalabilityMode = 'S1T3';
+            }
+        }
+        this._remoteSdp.send({
+            offerMediaObject,
+            offerRtpParameters: sendingRtpParameters,
+            answerRtpParameters: sendingRemoteRtpParameters,
+            codecOptions,
+            extmapAllowMixed: true
+        });
+        const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
+        logger.debug('send() | calling pc.setRemoteDescription() [answer:%o]', answer);
+        await this._pc.setRemoteDescription(answer);
+        // Store in the map.
+        this._mapMidTransceiver.set(localId, transceiver);
+        return {
+            localId,
+            rtpParameters: sendingRtpParameters,
+            rtpSender: transceiver.sender
+        };
+    }
+    async stopSending(localId) {
+        logger.debug('stopSending() [localId:%s]', localId);
+        const transceiver = this._mapMidTransceiver.get(localId);
+        if (!transceiver)
+            throw new Error('associated transceiver not found');
+        transceiver.sender.replaceTrack(null);
+        this._pc.removeTrack(transceiver.sender);
+        // NOTE: Cannot use closeMediaSection() due to the the note above in send()
+        // method.
+        // this._remoteSdp!.closeMediaSection(transceiver.mid);
+        this._remoteSdp.disableMediaSection(transceiver.mid);
+        const offer = await this._pc.createOffer();
+        logger.debug('stopSending() | calling pc.setLocalDescription() [offer:%o]', offer);
+        await this._pc.setLocalDescription(offer);
+        const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
+        logger.debug('stopSending() | calling pc.setRemoteDescription() [answer:%o]', answer);
+        await this._pc.setRemoteDescription(answer);
+    }
+    async replaceTrack(localId, track) {
+        this._assertSendDirection();
+        if (track) {
+            logger.debug('replaceTrack() [localId:%s, track.id:%s]', localId, track.id);
+        }
+        else {
+            logger.debug('replaceTrack() [localId:%s, no track]', localId);
+        }
+        const transceiver = this._mapMidTransceiver.get(localId);
+        if (!transceiver)
+            throw new Error('associated RTCRtpTransceiver not found');
+        await transceiver.sender.replaceTrack(track);
+    }
+    async setMaxSpatialLayer(localId, spatialLayer) {
+        this._assertSendDirection();
+        logger.debug('setMaxSpatialLayer() [localId:%s, spatialLayer:%s]', localId, spatialLayer);
+        const transceiver = this._mapMidTransceiver.get(localId);
+        if (!transceiver)
+            throw new Error('associated transceiver not found');
+        const parameters = transceiver.sender.getParameters();
+        // NOTE: We require encodings given from low to high, however Firefox
+        // requires them in reverse order, so do magic here.
+        spatialLayer = parameters.encodings.length - 1 - spatialLayer;
+        parameters.encodings.forEach((encoding, idx) => {
+            if (idx >= spatialLayer)
+                encoding.active = true;
+            else
+                encoding.active = false;
+        });
+        await transceiver.sender.setParameters(parameters);
+    }
+    async setRtpEncodingParameters(localId, params) {
+        this._assertSendDirection();
+        logger.debug('setRtpEncodingParameters() [localId:%s, params:%o]', localId, params);
+        const transceiver = this._mapMidTransceiver.get(localId);
+        if (!transceiver)
+            throw new Error('associated RTCRtpTransceiver not found');
+        const parameters = transceiver.sender.getParameters();
+        parameters.encodings.forEach((encoding, idx) => {
+            parameters.encodings[idx] = Object.assign(Object.assign({}, encoding), params);
+        });
+        await transceiver.sender.setParameters(parameters);
+    }
+    async getSenderStats(localId) {
+        this._assertSendDirection();
+        const transceiver = this._mapMidTransceiver.get(localId);
+        if (!transceiver)
+            throw new Error('associated RTCRtpTransceiver not found');
+        return transceiver.sender.getStats();
+    }
+    async sendDataChannel({ ordered, maxPacketLifeTime, maxRetransmits, label, protocol }) {
+        this._assertSendDirection();
+        const options = {
+            negotiated: true,
+            id: this._nextSendSctpStreamId,
+            ordered,
+            maxPacketLifeTime,
+            maxRetransmits,
+            protocol
+        };
+        logger.debug('sendDataChannel() [options:%o]', options);
+        const dataChannel = this._pc.createDataChannel(label, options);
+        // Increase next id.
+        this._nextSendSctpStreamId =
+            ++this._nextSendSctpStreamId % SCTP_NUM_STREAMS.MIS;
+        // If this is the first DataChannel we need to create the SDP answer with
+        // m=application section.
+        if (!this._hasDataChannelMediaSection) {
+            const offer = await this._pc.createOffer();
+            const localSdpObject = sdpTransform.parse(offer.sdp);
+            const offerMediaObject = localSdpObject.media
+                .find((m) => m.type === 'application');
+            if (!this._transportReady)
+                await this._setupTransport({ localDtlsRole: 'server', localSdpObject });
+            logger.debug('sendDataChannel() | calling pc.setLocalDescription() [offer:%o]', offer);
+            await this._pc.setLocalDescription(offer);
+            this._remoteSdp.sendSctpAssociation({ offerMediaObject });
+            const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
+            logger.debug('sendDataChannel() | calling pc.setRemoteDescription() [answer:%o]', answer);
+            await this._pc.setRemoteDescription(answer);
+            this._hasDataChannelMediaSection = true;
+        }
+        const sctpStreamParameters = {
+            streamId: options.id,
+            ordered: options.ordered,
+            maxPacketLifeTime: options.maxPacketLifeTime,
+            maxRetransmits: options.maxRetransmits
+        };
+        return { dataChannel, sctpStreamParameters };
+    }
+    async receive({ trackId, kind, rtpParameters }) {
+        this._assertRecvDirection();
+        logger.debug('receive() [trackId:%s, kind:%s]', trackId, kind);
+        const localId = rtpParameters.mid || String(this._mapMidTransceiver.size);
+        this._remoteSdp.receive({
+            mid: localId,
+            kind,
+            offerRtpParameters: rtpParameters,
+            streamId: rtpParameters.rtcp.cname,
+            trackId
+        });
+        const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
+        logger.debug('receive() | calling pc.setRemoteDescription() [offer:%o]', offer);
+        await this._pc.setRemoteDescription(offer);
+        let answer = await this._pc.createAnswer();
+        const localSdpObject = sdpTransform.parse(answer.sdp);
+        const answerMediaObject = localSdpObject.media
+            .find((m) => String(m.mid) === localId);
+        // May need to modify codec parameters in the answer based on codec
+        // parameters in the offer.
+        sdpCommonUtils.applyCodecParameters({
+            offerRtpParameters: rtpParameters,
+            answerMediaObject
+        });
+        answer = { type: 'answer', sdp: sdpTransform.write(localSdpObject) };
+        if (!this._transportReady)
+            await this._setupTransport({ localDtlsRole: 'client', localSdpObject });
+        logger.debug('receive() | calling pc.setLocalDescription() [answer:%o]', answer);
+        await this._pc.setLocalDescription(answer);
+        const transceiver = this._pc.getTransceivers()
+            .find((t) => t.mid === localId);
+        if (!transceiver)
+            throw new Error('new RTCRtpTransceiver not found');
+        // Store in the map.
+        this._mapMidTransceiver.set(localId, transceiver);
+        return {
+            localId,
+            track: transceiver.receiver.track,
+            rtpReceiver: transceiver.receiver
+        };
+    }
+    async stopReceiving(localId) {
+        this._assertRecvDirection();
+        logger.debug('stopReceiving() [localId:%s]', localId);
+        const transceiver = this._mapMidTransceiver.get(localId);
+        if (!transceiver)
+            throw new Error('associated RTCRtpTransceiver not found');
+        this._remoteSdp.closeMediaSection(transceiver.mid);
+        const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
+        logger.debug('stopReceiving() | calling pc.setRemoteDescription() [offer:%o]', offer);
+        await this._pc.setRemoteDescription(offer);
+        const answer = await this._pc.createAnswer();
+        logger.debug('stopReceiving() | calling pc.setLocalDescription() [answer:%o]', answer);
+        await this._pc.setLocalDescription(answer);
+    }
+    async getReceiverStats(localId) {
+        this._assertRecvDirection();
+        const transceiver = this._mapMidTransceiver.get(localId);
+        if (!transceiver)
+            throw new Error('associated RTCRtpTransceiver not found');
+        return transceiver.receiver.getStats();
+    }
+    async receiveDataChannel({ sctpStreamParameters, label, protocol }) {
+        this._assertRecvDirection();
+        const { streamId, ordered, maxPacketLifeTime, maxRetransmits } = sctpStreamParameters;
+        const options = {
+            negotiated: true,
+            id: streamId,
+            ordered,
+            maxPacketLifeTime,
+            maxRetransmits,
+            protocol
+        };
+        logger.debug('receiveDataChannel() [options:%o]', options);
+        const dataChannel = this._pc.createDataChannel(label, options);
+        // If this is the first DataChannel we need to create the SDP offer with
+        // m=application section.
+        if (!this._hasDataChannelMediaSection) {
+            this._remoteSdp.receiveSctpAssociation();
+            const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
+            logger.debug('receiveDataChannel() | calling pc.setRemoteDescription() [offer:%o]', offer);
+            await this._pc.setRemoteDescription(offer);
+            const answer = await this._pc.createAnswer();
+            if (!this._transportReady) {
+                const localSdpObject = sdpTransform.parse(answer.sdp);
+                await this._setupTransport({ localDtlsRole: 'client', localSdpObject });
+            }
+            logger.debug('receiveDataChannel() | calling pc.setRemoteDescription() [answer:%o]', answer);
+            await this._pc.setLocalDescription(answer);
+            this._hasDataChannelMediaSection = true;
+        }
+        return { dataChannel };
+    }
+    async _setupTransport({ localDtlsRole, localSdpObject }) {
+        if (!localSdpObject)
+            localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
+        // Get our local DTLS parameters.
+        const dtlsParameters = sdpCommonUtils.extractDtlsParameters({ sdpObject: localSdpObject });
+        // Set our DTLS role.
+        dtlsParameters.role = localDtlsRole;
+        // Update the remote DTLS role in the SDP.
+        this._remoteSdp.updateDtlsRole(localDtlsRole === 'client' ? 'server' : 'client');
+        // Need to tell the remote transport about our parameters.
+        await this.safeEmitAsPromise('@connect', { dtlsParameters });
+        this._transportReady = true;
+    }
+    _assertSendDirection() {
+        if (this._direction !== 'send') {
+            throw new Error('method can just be called for handlers with "send" direction');
+        }
+    }
+    _assertRecvDirection() {
+        if (this._direction !== 'recv') {
+            throw new Error('method can just be called for handlers with "recv" direction');
+        }
+    }
+}
+exports.Firefox60 = Firefox60;
+
+},{"../Logger":13,"../errors":18,"../ortc":36,"../utils":39,"./HandlerInterface":25,"./sdp/RemoteSdp":31,"./sdp/commonUtils":32,"./sdp/unifiedPlanUtils":34,"sdp-transform":44}],25:[function(require,module,exports){
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.HandlerInterface = void 0;
+const EnhancedEventEmitter_1 = require("../EnhancedEventEmitter");
+class HandlerInterface extends EnhancedEventEmitter_1.EnhancedEventEmitter {
+    /**
+     * @emits @connect - (
+     *     { dtlsParameters: DtlsParameters },
+     *     callback: Function,
+     *     errback: Function
+     *   )
+     * @emits @connectionstatechange - (connectionState: ConnectionState)
+     */
+    constructor() {
+        super();
+    }
+}
+exports.HandlerInterface = HandlerInterface;
+
+},{"../EnhancedEventEmitter":12}],26:[function(require,module,exports){
+"use strict";
+var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
+}) : (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    o[k2] = m[k];
+}));
+var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
+    Object.defineProperty(o, "default", { enumerable: true, value: v });
+}) : function(o, v) {
+    o["default"] = v;
+});
+var __importStar = (this && this.__importStar) || function (mod) {
+    if (mod && mod.__esModule) return mod;
+    var result = {};
+    if (mod != null) for (var k in mod) if (k !== "default" && Object.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
+    __setModuleDefault(result, mod);
+    return result;
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.ReactNative = void 0;
+const sdpTransform = __importStar(require("sdp-transform"));
+const Logger_1 = require("../Logger");
+const errors_1 = require("../errors");
+const utils = __importStar(require("../utils"));
+const ortc = __importStar(require("../ortc"));
+const sdpCommonUtils = __importStar(require("./sdp/commonUtils"));
+const sdpPlanBUtils = __importStar(require("./sdp/planBUtils"));
+const HandlerInterface_1 = require("./HandlerInterface");
+const RemoteSdp_1 = require("./sdp/RemoteSdp");
+const logger = new Logger_1.Logger('ReactNative');
+const SCTP_NUM_STREAMS = { OS: 1024, MIS: 1024 };
+class ReactNative extends HandlerInterface_1.HandlerInterface {
+    constructor() {
+        super();
+        // Local stream for sending.
+        this._sendStream = new MediaStream();
+        // Map of sending MediaStreamTracks indexed by localId.
+        this._mapSendLocalIdTrack = new Map();
+        // Next sending localId.
+        this._nextSendLocalId = 0;
+        // Map of MID, RTP parameters and RTCRtpReceiver indexed by local id.
+        // Value is an Object with mid, rtpParameters and rtpReceiver.
+        this._mapRecvLocalIdInfo = new Map();
+        // Whether a DataChannel m=application section has been created.
+        this._hasDataChannelMediaSection = false;
+        // Sending DataChannel id value counter. Incremented for each new DataChannel.
+        this._nextSendSctpStreamId = 0;
+        // Got transport local and remote parameters.
+        this._transportReady = false;
+    }
+    /**
+     * Creates a factory function.
+     */
+    static createFactory() {
+        return () => new ReactNative();
+    }
+    get name() {
+        return 'ReactNative';
+    }
+    close() {
+        logger.debug('close()');
+        // Free/dispose native stream and tracks.
+        // @ts-ignore (proprietary API in react-native-webrtc).
+        this._sendStream.release();
+        // Close RTCPeerConnection.
+        if (this._pc) {
+            try {
+                this._pc.close();
+            }
+            catch (error) { }
+        }
+    }
+    async getNativeRtpCapabilities() {
+        logger.debug('getNativeRtpCapabilities()');
+        const pc = new RTCPeerConnection({
+            iceServers: [],
+            iceTransportPolicy: 'all',
+            bundlePolicy: 'max-bundle',
+            rtcpMuxPolicy: 'require',
+            sdpSemantics: 'plan-b'
+        });
+        try {
+            const offer = await pc.createOffer({
+                offerToReceiveAudio: true,
+                offerToReceiveVideo: true
+            });
+            try {
+                pc.close();
+            }
+            catch (error) { }
+            const sdpObject = sdpTransform.parse(offer.sdp);
+            const nativeRtpCapabilities = sdpCommonUtils.extractRtpCapabilities({ sdpObject });
+            return nativeRtpCapabilities;
+        }
+        catch (error) {
+            try {
+                pc.close();
+            }
+            catch (error2) { }
+            throw error;
+        }
+    }
+    async getNativeSctpCapabilities() {
+        logger.debug('getNativeSctpCapabilities()');
+        return {
+            numStreams: SCTP_NUM_STREAMS
+        };
+    }
+    run({ direction, iceParameters, iceCandidates, dtlsParameters, sctpParameters, iceServers, iceTransportPolicy, additionalSettings, proprietaryConstraints, extendedRtpCapabilities }) {
+        logger.debug('run()');
+        this._direction = direction;
+        this._remoteSdp = new RemoteSdp_1.RemoteSdp({
+            iceParameters,
+            iceCandidates,
+            dtlsParameters,
+            sctpParameters,
+            planB: true
+        });
+        this._sendingRtpParametersByKind =
+            {
+                audio: ortc.getSendingRtpParameters('audio', extendedRtpCapabilities),
+                video: ortc.getSendingRtpParameters('video', extendedRtpCapabilities)
+            };
+        this._sendingRemoteRtpParametersByKind =
+            {
+                audio: ortc.getSendingRemoteRtpParameters('audio', extendedRtpCapabilities),
+                video: ortc.getSendingRemoteRtpParameters('video', extendedRtpCapabilities)
+            };
+        this._pc = new RTCPeerConnection(Object.assign({ iceServers: iceServers || [], iceTransportPolicy: iceTransportPolicy || 'all', bundlePolicy: 'max-bundle', rtcpMuxPolicy: 'require', sdpSemantics: 'plan-b' }, additionalSettings), proprietaryConstraints);
+        // Handle RTCPeerConnection connection status.
+        this._pc.addEventListener('iceconnectionstatechange', () => {
+            switch (this._pc.iceConnectionState) {
+                case 'checking':
+                    this.emit('@connectionstatechange', 'connecting');
+                    break;
+                case 'connected':
+                case 'completed':
+                    this.emit('@connectionstatechange', 'connected');
+                    break;
+                case 'failed':
+                    this.emit('@connectionstatechange', 'failed');
+                    break;
+                case 'disconnected':
+                    this.emit('@connectionstatechange', 'disconnected');
+                    break;
+                case 'closed':
+                    this.emit('@connectionstatechange', 'closed');
+                    break;
+            }
+        });
+    }
+    async updateIceServers(iceServers) {
+        logger.debug('updateIceServers()');
+        const configuration = this._pc.getConfiguration();
+        configuration.iceServers = iceServers;
+        this._pc.setConfiguration(configuration);
+    }
+    async restartIce(iceParameters) {
+        logger.debug('restartIce()');
+        // Provide the remote SDP handler with new remote ICE parameters.
+        this._remoteSdp.updateIceParameters(iceParameters);
+        if (!this._transportReady)
+            return;
+        if (this._direction === 'send') {
+            const offer = await this._pc.createOffer({ iceRestart: true });
+            logger.debug('restartIce() | calling pc.setLocalDescription() [offer:%o]', offer);
+            await this._pc.setLocalDescription(offer);
+            const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
+            logger.debug('restartIce() | calling pc.setRemoteDescription() [answer:%o]', answer);
+            await this._pc.setRemoteDescription(answer);
+        }
+        else {
+            const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
+            logger.debug('restartIce() | calling pc.setRemoteDescription() [offer:%o]', offer);
+            await this._pc.setRemoteDescription(offer);
+            const answer = await this._pc.createAnswer();
+            logger.debug('restartIce() | calling pc.setLocalDescription() [answer:%o]', answer);
+            await this._pc.setLocalDescription(answer);
+        }
+    }
+    async getTransportStats() {
+        return this._pc.getStats();
+    }
+    async send({ track, encodings, codecOptions, codec }) {
+        this._assertSendDirection();
+        logger.debug('send() [kind:%s, track.id:%s]', track.kind, track.id);
+        if (codec) {
+            logger.warn('send() | codec selection is not available in %s handler', this.name);
+        }
+        this._sendStream.addTrack(track);
+        this._pc.addStream(this._sendStream);
+        let offer = await this._pc.createOffer();
+        let localSdpObject = sdpTransform.parse(offer.sdp);
+        let offerMediaObject;
+        const sendingRtpParameters = utils.clone(this._sendingRtpParametersByKind[track.kind], {});
+        sendingRtpParameters.codecs =
+            ortc.reduceCodecs(sendingRtpParameters.codecs);
+        const sendingRemoteRtpParameters = utils.clone(this._sendingRemoteRtpParametersByKind[track.kind], {});
+        sendingRemoteRtpParameters.codecs =
+            ortc.reduceCodecs(sendingRemoteRtpParameters.codecs);
+        if (!this._transportReady)
+            await this._setupTransport({ localDtlsRole: 'server', localSdpObject });
+        if (track.kind === 'video' && encodings && encodings.length > 1) {
+            logger.debug('send() | enabling simulcast');
+            localSdpObject = sdpTransform.parse(offer.sdp);
+            offerMediaObject = localSdpObject.media
+                .find((m) => m.type === 'video');
+            sdpPlanBUtils.addLegacySimulcast({
+                offerMediaObject,
+                track,
+                numStreams: encodings.length
+            });
+            offer = { type: 'offer', sdp: sdpTransform.write(localSdpObject) };
+        }
+        logger.debug('send() | calling pc.setLocalDescription() [offer:%o]', offer);
+        await this._pc.setLocalDescription(offer);
+        localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
+        offerMediaObject = localSdpObject.media
+            .find((m) => m.type === track.kind);
+        // Set RTCP CNAME.
+        sendingRtpParameters.rtcp.cname =
+            sdpCommonUtils.getCname({ offerMediaObject });
+        // Set RTP encodings.
+        sendingRtpParameters.encodings =
+            sdpPlanBUtils.getRtpEncodings({ offerMediaObject, track });
+        // Complete encodings with given values.
+        if (encodings) {
+            for (let idx = 0; idx < sendingRtpParameters.encodings.length; ++idx) {
+                if (encodings[idx])
+                    Object.assign(sendingRtpParameters.encodings[idx], encodings[idx]);
+            }
+        }
+        // If VP8 or H264 and there is effective simulcast, add scalabilityMode to
+        // each encoding.
+        if (sendingRtpParameters.encodings.length > 1 &&
+            (sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/vp8' ||
+                sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/h264')) {
+            for (const encoding of sendingRtpParameters.encodings) {
+                encoding.scalabilityMode = 'S1T3';
+            }
+        }
+        this._remoteSdp.send({
+            offerMediaObject,
+            offerRtpParameters: sendingRtpParameters,
+            answerRtpParameters: sendingRemoteRtpParameters,
+            codecOptions
+        });
+        const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
+        logger.debug('send() | calling pc.setRemoteDescription() [answer:%o]', answer);
+        await this._pc.setRemoteDescription(answer);
+        const localId = String(this._nextSendLocalId);
+        this._nextSendLocalId++;
+        // Insert into the map.
+        this._mapSendLocalIdTrack.set(localId, track);
+        return {
+            localId: localId,
+            rtpParameters: sendingRtpParameters
+        };
+    }
+    async stopSending(localId) {
+        this._assertSendDirection();
+        logger.debug('stopSending() [localId:%s]', localId);
+        const track = this._mapSendLocalIdTrack.get(localId);
+        if (!track)
+            throw new Error('track not found');
+        this._mapSendLocalIdTrack.delete(localId);
+        this._sendStream.removeTrack(track);
+        this._pc.addStream(this._sendStream);
+        const offer = await this._pc.createOffer();
+        logger.debug('stopSending() | calling pc.setLocalDescription() [offer:%o]', offer);
+        try {
+            await this._pc.setLocalDescription(offer);
+        }
+        catch (error) {
+            // NOTE: If there are no sending tracks, setLocalDescription() will fail with
+            // "Failed to create channels". If so, ignore it.
+            if (this._sendStream.getTracks().length === 0) {
+                logger.warn('stopSending() | ignoring expected error due no sending tracks: %s', error.toString());
+                return;
+            }
+            throw error;
+        }
+        if (this._pc.signalingState === 'stable')
+            return;
+        const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
+        logger.debug('stopSending() | calling pc.setRemoteDescription() [answer:%o]', answer);
+        await this._pc.setRemoteDescription(answer);
+    }
+    async replaceTrack(
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    localId, track) {
+        throw new errors_1.UnsupportedError('not implemented');
+    }
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    async setMaxSpatialLayer(localId, spatialLayer) {
+        throw new errors_1.UnsupportedError('not implemented');
+    }
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    async setRtpEncodingParameters(localId, params) {
+        throw new errors_1.UnsupportedError('not implemented');
+    }
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    async getSenderStats(localId) {
+        throw new errors_1.UnsupportedError('not implemented');
+    }
+    async sendDataChannel({ ordered, maxPacketLifeTime, maxRetransmits, label, protocol }) {
+        this._assertSendDirection();
+        const options = {
+            negotiated: true,
+            id: this._nextSendSctpStreamId,
+            ordered,
+            maxPacketLifeTime,
+            maxRetransmitTime: maxPacketLifeTime,
+            maxRetransmits,
+            protocol
+        };
+        logger.debug('sendDataChannel() [options:%o]', options);
+        const dataChannel = this._pc.createDataChannel(label, options);
+        // Increase next id.
+        this._nextSendSctpStreamId =
+            ++this._nextSendSctpStreamId % SCTP_NUM_STREAMS.MIS;
+        // If this is the first DataChannel we need to create the SDP answer with
+        // m=application section.
+        if (!this._hasDataChannelMediaSection) {
+            const offer = await this._pc.createOffer();
+            const localSdpObject = sdpTransform.parse(offer.sdp);
+            const offerMediaObject = localSdpObject.media
+                .find((m) => m.type === 'application');
+            if (!this._transportReady)
+                await this._setupTransport({ localDtlsRole: 'server', localSdpObject });
+            logger.debug('sendDataChannel() | calling pc.setLocalDescription() [offer:%o]', offer);
+            await this._pc.setLocalDescription(offer);
+            this._remoteSdp.sendSctpAssociation({ offerMediaObject });
+            const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
+            logger.debug('sendDataChannel() | calling pc.setRemoteDescription() [answer:%o]', answer);
+            await this._pc.setRemoteDescription(answer);
+            this._hasDataChannelMediaSection = true;
+        }
+        const sctpStreamParameters = {
+            streamId: options.id,
+            ordered: options.ordered,
+            maxPacketLifeTime: options.maxPacketLifeTime,
+            maxRetransmits: options.maxRetransmits
+        };
+        return { dataChannel, sctpStreamParameters };
+    }
+    async receive({ trackId, kind, rtpParameters }) {
+        this._assertRecvDirection();
+        logger.debug('receive() [trackId:%s, kind:%s]', trackId, kind);
+        const localId = trackId;
+        const mid = kind;
+        let streamId = rtpParameters.rtcp.cname;
+        // NOTE: In React-Native we cannot reuse the same remote MediaStream for new
+        // remote tracks. This is because react-native-webrtc does not react on new
+        // tracks generated within already existing streams, so force the streamId
+        // to be different.
+        logger.debug('receive() | forcing a random remote streamId to avoid well known bug in react-native-webrtc');
+        streamId += `-hack-${utils.generateRandomNumber()}`;
+        this._remoteSdp.receive({
+            mid,
+            kind,
+            offerRtpParameters: rtpParameters,
+            streamId,
+            trackId
+        });
+        const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
+        logger.debug('receive() | calling pc.setRemoteDescription() [offer:%o]', offer);
+        await this._pc.setRemoteDescription(offer);
+        let answer = await this._pc.createAnswer();
+        const localSdpObject = sdpTransform.parse(answer.sdp);
+        const answerMediaObject = localSdpObject.media
+            .find((m) => String(m.mid) === mid);
+        // May need to modify codec parameters in the answer based on codec
+        // parameters in the offer.
+        sdpCommonUtils.applyCodecParameters({
+            offerRtpParameters: rtpParameters,
+            answerMediaObject
+        });
+        answer = { type: 'answer', sdp: sdpTransform.write(localSdpObject) };
+        if (!this._transportReady)
+            await this._setupTransport({ localDtlsRole: 'client', localSdpObject });
+        logger.debug('receive() | calling pc.setLocalDescription() [answer:%o]', answer);
+        await this._pc.setLocalDescription(answer);
+        const stream = this._pc.getRemoteStreams()
+            .find((s) => s.id === streamId);
+        const track = stream.getTrackById(localId);
+        if (!track)
+            throw new Error('remote track not found');
+        // Insert into the map.
+        this._mapRecvLocalIdInfo.set(localId, { mid, rtpParameters });
+        return { localId, track };
+    }
+    async stopReceiving(localId) {
+        this._assertRecvDirection();
+        logger.debug('stopReceiving() [localId:%s]', localId);
+        const { mid, rtpParameters } = this._mapRecvLocalIdInfo.get(localId) || {};
+        // Remove from the map.
+        this._mapRecvLocalIdInfo.delete(localId);
+        this._remoteSdp.planBStopReceiving({ mid: mid, offerRtpParameters: rtpParameters });
+        const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
+        logger.debug('stopReceiving() | calling pc.setRemoteDescription() [offer:%o]', offer);
+        await this._pc.setRemoteDescription(offer);
+        const answer = await this._pc.createAnswer();
+        logger.debug('stopReceiving() | calling pc.setLocalDescription() [answer:%o]', answer);
+        await this._pc.setLocalDescription(answer);
+    }
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    async getReceiverStats(localId) {
+        throw new errors_1.UnsupportedError('not implemented');
+    }
+    async receiveDataChannel({ sctpStreamParameters, label, protocol }) {
+        this._assertRecvDirection();
+        const { streamId, ordered, maxPacketLifeTime, maxRetransmits } = sctpStreamParameters;
+        const options = {
+            negotiated: true,
+            id: streamId,
+            ordered,
+            maxPacketLifeTime,
+            maxRetransmitTime: maxPacketLifeTime,
+            maxRetransmits,
+            protocol
+        };
+        logger.debug('receiveDataChannel() [options:%o]', options);
+        const dataChannel = this._pc.createDataChannel(label, options);
+        // If this is the first DataChannel we need to create the SDP offer with
+        // m=application section.
+        if (!this._hasDataChannelMediaSection) {
+            this._remoteSdp.receiveSctpAssociation({ oldDataChannelSpec: true });
+            const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
+            logger.debug('receiveDataChannel() | calling pc.setRemoteDescription() [offer:%o]', offer);
+            await this._pc.setRemoteDescription(offer);
+            const answer = await this._pc.createAnswer();
+            if (!this._transportReady) {
+                const localSdpObject = sdpTransform.parse(answer.sdp);
+                await this._setupTransport({ localDtlsRole: 'client', localSdpObject });
+            }
+            logger.debug('receiveDataChannel() | calling pc.setRemoteDescription() [answer:%o]', answer);
+            await this._pc.setLocalDescription(answer);
+            this._hasDataChannelMediaSection = true;
+        }
+        return { dataChannel };
+    }
+    async _setupTransport({ localDtlsRole, localSdpObject }) {
+        if (!localSdpObject)
+            localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
+        // Get our local DTLS parameters.
+        const dtlsParameters = sdpCommonUtils.extractDtlsParameters({ sdpObject: localSdpObject });
+        // Set our DTLS role.
+        dtlsParameters.role = localDtlsRole;
+        // Update the remote DTLS role in the SDP.
+        this._remoteSdp.updateDtlsRole(localDtlsRole === 'client' ? 'server' : 'client');
+        // Need to tell the remote transport about our parameters.
+        await this.safeEmitAsPromise('@connect', { dtlsParameters });
+        this._transportReady = true;
+    }
+    _assertSendDirection() {
+        if (this._direction !== 'send') {
+            throw new Error('method can just be called for handlers with "send" direction');
+        }
+    }
+    _assertRecvDirection() {
+        if (this._direction !== 'recv') {
+            throw new Error('method can just be called for handlers with "recv" direction');
+        }
+    }
+}
+exports.ReactNative = ReactNative;
+
+},{"../Logger":13,"../errors":18,"../ortc":36,"../utils":39,"./HandlerInterface":25,"./sdp/RemoteSdp":31,"./sdp/commonUtils":32,"./sdp/planBUtils":33,"sdp-transform":44}],27:[function(require,module,exports){
+"use strict";
+var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
+}) : (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    o[k2] = m[k];
+}));
+var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
+    Object.defineProperty(o, "default", { enumerable: true, value: v });
+}) : function(o, v) {
+    o["default"] = v;
+});
+var __importStar = (this && this.__importStar) || function (mod) {
+    if (mod && mod.__esModule) return mod;
+    var result = {};
+    if (mod != null) for (var k in mod) if (k !== "default" && Object.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
+    __setModuleDefault(result, mod);
+    return result;
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.Safari11 = void 0;
+const sdpTransform = __importStar(require("sdp-transform"));
+const Logger_1 = require("../Logger");
+const utils = __importStar(require("../utils"));
+const ortc = __importStar(require("../ortc"));
+const sdpCommonUtils = __importStar(require("./sdp/commonUtils"));
+const sdpPlanBUtils = __importStar(require("./sdp/planBUtils"));
+const HandlerInterface_1 = require("./HandlerInterface");
+const RemoteSdp_1 = require("./sdp/RemoteSdp");
+const logger = new Logger_1.Logger('Safari11');
+const SCTP_NUM_STREAMS = { OS: 1024, MIS: 1024 };
+class Safari11 extends HandlerInterface_1.HandlerInterface {
+    constructor() {
+        super();
+        // Local stream for sending.
+        this._sendStream = new MediaStream();
+        // Map of RTCRtpSender indexed by localId.
+        this._mapSendLocalIdRtpSender = new Map();
+        // Next sending localId.
+        this._nextSendLocalId = 0;
+        // Map of MID, RTP parameters and RTCRtpReceiver indexed by local id.
+        // Value is an Object with mid, rtpParameters and rtpReceiver.
+        this._mapRecvLocalIdInfo = new Map();
+        // Whether a DataChannel m=application section has been created.
+        this._hasDataChannelMediaSection = false;
+        // Sending DataChannel id value counter. Incremented for each new DataChannel.
+        this._nextSendSctpStreamId = 0;
+        // Got transport local and remote parameters.
+        this._transportReady = false;
+    }
+    /**
+     * Creates a factory function.
+     */
+    static createFactory() {
+        return () => new Safari11();
+    }
+    get name() {
+        return 'Safari11';
+    }
+    close() {
+        logger.debug('close()');
+        // Close RTCPeerConnection.
+        if (this._pc) {
+            try {
+                this._pc.close();
+            }
+            catch (error) { }
+        }
+    }
+    async getNativeRtpCapabilities() {
+        logger.debug('getNativeRtpCapabilities()');
+        const pc = new RTCPeerConnection({
+            iceServers: [],
+            iceTransportPolicy: 'all',
+            bundlePolicy: 'max-bundle',
+            rtcpMuxPolicy: 'require',
+            sdpSemantics: 'plan-b'
+        });
+        try {
+            const offer = await pc.createOffer({
+                offerToReceiveAudio: true,
+                offerToReceiveVideo: true
+            });
+            try {
+                pc.close();
+            }
+            catch (error) { }
+            const sdpObject = sdpTransform.parse(offer.sdp);
+            const nativeRtpCapabilities = sdpCommonUtils.extractRtpCapabilities({ sdpObject });
+            return nativeRtpCapabilities;
+        }
+        catch (error) {
+            try {
+                pc.close();
+            }
+            catch (error2) { }
+            throw error;
+        }
+    }
+    async getNativeSctpCapabilities() {
+        logger.debug('getNativeSctpCapabilities()');
+        return {
+            numStreams: SCTP_NUM_STREAMS
+        };
+    }
+    run({ direction, iceParameters, iceCandidates, dtlsParameters, sctpParameters, iceServers, iceTransportPolicy, additionalSettings, proprietaryConstraints, extendedRtpCapabilities }) {
+        logger.debug('run()');
+        this._direction = direction;
+        this._remoteSdp = new RemoteSdp_1.RemoteSdp({
+            iceParameters,
+            iceCandidates,
+            dtlsParameters,
+            sctpParameters,
+            planB: true
+        });
+        this._sendingRtpParametersByKind =
+            {
+                audio: ortc.getSendingRtpParameters('audio', extendedRtpCapabilities),
+                video: ortc.getSendingRtpParameters('video', extendedRtpCapabilities)
+            };
+        this._sendingRemoteRtpParametersByKind =
+            {
+                audio: ortc.getSendingRemoteRtpParameters('audio', extendedRtpCapabilities),
+                video: ortc.getSendingRemoteRtpParameters('video', extendedRtpCapabilities)
+            };
+        this._pc = new RTCPeerConnection(Object.assign({ iceServers: iceServers || [], iceTransportPolicy: iceTransportPolicy || 'all', bundlePolicy: 'max-bundle', rtcpMuxPolicy: 'require' }, additionalSettings), proprietaryConstraints);
+        // Handle RTCPeerConnection connection status.
+        this._pc.addEventListener('iceconnectionstatechange', () => {
+            switch (this._pc.iceConnectionState) {
+                case 'checking':
+                    this.emit('@connectionstatechange', 'connecting');
+                    break;
+                case 'connected':
+                case 'completed':
+                    this.emit('@connectionstatechange', 'connected');
+                    break;
+                case 'failed':
+                    this.emit('@connectionstatechange', 'failed');
+                    break;
+                case 'disconnected':
+                    this.emit('@connectionstatechange', 'disconnected');
+                    break;
+                case 'closed':
+                    this.emit('@connectionstatechange', 'closed');
+                    break;
+            }
+        });
+    }
+    async updateIceServers(iceServers) {
+        logger.debug('updateIceServers()');
+        const configuration = this._pc.getConfiguration();
+        configuration.iceServers = iceServers;
+        this._pc.setConfiguration(configuration);
+    }
+    async restartIce(iceParameters) {
+        logger.debug('restartIce()');
+        // Provide the remote SDP handler with new remote ICE parameters.
+        this._remoteSdp.updateIceParameters(iceParameters);
+        if (!this._transportReady)
+            return;
+        if (this._direction === 'send') {
+            const offer = await this._pc.createOffer({ iceRestart: true });
+            logger.debug('restartIce() | calling pc.setLocalDescription() [offer:%o]', offer);
+            await this._pc.setLocalDescription(offer);
+            const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
+            logger.debug('restartIce() | calling pc.setRemoteDescription() [answer:%o]', answer);
+            await this._pc.setRemoteDescription(answer);
+        }
+        else {
+            const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
+            logger.debug('restartIce() | calling pc.setRemoteDescription() [offer:%o]', offer);
+            await this._pc.setRemoteDescription(offer);
+            const answer = await this._pc.createAnswer();
+            logger.debug('restartIce() | calling pc.setLocalDescription() [answer:%o]', answer);
+            await this._pc.setLocalDescription(answer);
+        }
+    }
+    async getTransportStats() {
+        return this._pc.getStats();
+    }
+    async send({ track, encodings, codecOptions, codec }) {
+        this._assertSendDirection();
+        logger.debug('send() [kind:%s, track.id:%s]', track.kind, track.id);
+        if (codec) {
+            logger.warn('send() | codec selection is not available in %s handler', this.name);
+        }
+        this._sendStream.addTrack(track);
+        this._pc.addTrack(track, this._sendStream);
+        let offer = await this._pc.createOffer();
+        let localSdpObject = sdpTransform.parse(offer.sdp);
+        let offerMediaObject;
+        const sendingRtpParameters = utils.clone(this._sendingRtpParametersByKind[track.kind], {});
+        sendingRtpParameters.codecs =
+            ortc.reduceCodecs(sendingRtpParameters.codecs);
+        const sendingRemoteRtpParameters = utils.clone(this._sendingRemoteRtpParametersByKind[track.kind], {});
+        sendingRemoteRtpParameters.codecs =
+            ortc.reduceCodecs(sendingRemoteRtpParameters.codecs);
+        if (!this._transportReady)
+            await this._setupTransport({ localDtlsRole: 'server', localSdpObject });
+        if (track.kind === 'video' && encodings && encodings.length > 1) {
+            logger.debug('send() | enabling simulcast');
+            localSdpObject = sdpTransform.parse(offer.sdp);
+            offerMediaObject = localSdpObject.media.find((m) => m.type === 'video');
+            sdpPlanBUtils.addLegacySimulcast({
+                offerMediaObject,
+                track,
+                numStreams: encodings.length
+            });
+            offer = { type: 'offer', sdp: sdpTransform.write(localSdpObject) };
+        }
+        logger.debug('send() | calling pc.setLocalDescription() [offer:%o]', offer);
+        await this._pc.setLocalDescription(offer);
+        localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
+        offerMediaObject = localSdpObject.media
+            .find((m) => m.type === track.kind);
+        // Set RTCP CNAME.
+        sendingRtpParameters.rtcp.cname =
+            sdpCommonUtils.getCname({ offerMediaObject });
+        // Set RTP encodings.
+        sendingRtpParameters.encodings =
+            sdpPlanBUtils.getRtpEncodings({ offerMediaObject, track });
+        // Complete encodings with given values.
+        if (encodings) {
+            for (let idx = 0; idx < sendingRtpParameters.encodings.length; ++idx) {
+                if (encodings[idx])
+                    Object.assign(sendingRtpParameters.encodings[idx], encodings[idx]);
+            }
+        }
+        // If VP8 and there is effective simulcast, add scalabilityMode to each
+        // encoding.
+        if (sendingRtpParameters.encodings.length > 1 &&
+            sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/vp8') {
+            for (const encoding of sendingRtpParameters.encodings) {
+                encoding.scalabilityMode = 'S1T3';
+            }
+        }
+        this._remoteSdp.send({
+            offerMediaObject,
+            offerRtpParameters: sendingRtpParameters,
+            answerRtpParameters: sendingRemoteRtpParameters,
+            codecOptions
+        });
+        const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
+        logger.debug('send() | calling pc.setRemoteDescription() [answer:%o]', answer);
+        await this._pc.setRemoteDescription(answer);
+        const localId = String(this._nextSendLocalId);
+        this._nextSendLocalId++;
+        const rtpSender = this._pc.getSenders()
+            .find((s) => s.track === track);
+        // Insert into the map.
+        this._mapSendLocalIdRtpSender.set(localId, rtpSender);
+        return {
+            localId: localId,
+            rtpParameters: sendingRtpParameters,
+            rtpSender
+        };
+    }
+    async stopSending(localId) {
+        this._assertSendDirection();
+        const rtpSender = this._mapSendLocalIdRtpSender.get(localId);
+        if (!rtpSender)
+            throw new Error('associated RTCRtpSender not found');
+        if (rtpSender.track)
+            this._sendStream.removeTrack(rtpSender.track);
+        this._mapSendLocalIdRtpSender.delete(localId);
+        const offer = await this._pc.createOffer();
+        logger.debug('stopSending() | calling pc.setLocalDescription() [offer:%o]', offer);
+        try {
+            await this._pc.setLocalDescription(offer);
+        }
+        catch (error) {
+            // NOTE: If there are no sending tracks, setLocalDescription() will fail with
+            // "Failed to create channels". If so, ignore it.
+            if (this._sendStream.getTracks().length === 0) {
+                logger.warn('stopSending() | ignoring expected error due no sending tracks: %s', error.toString());
+                return;
+            }
+            throw error;
+        }
+        if (this._pc.signalingState === 'stable')
+            return;
+        const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
+        logger.debug('stopSending() | calling pc.setRemoteDescription() [answer:%o]', answer);
+        await this._pc.setRemoteDescription(answer);
+    }
+    async replaceTrack(localId, track) {
+        this._assertSendDirection();
+        if (track) {
+            logger.debug('replaceTrack() [localId:%s, track.id:%s]', localId, track.id);
+        }
+        else {
+            logger.debug('replaceTrack() [localId:%s, no track]', localId);
+        }
+        const rtpSender = this._mapSendLocalIdRtpSender.get(localId);
+        if (!rtpSender)
+            throw new Error('associated RTCRtpSender not found');
+        const oldTrack = rtpSender.track;
+        await rtpSender.replaceTrack(track);
+        // Remove the old track from the local stream.
+        if (oldTrack)
+            this._sendStream.removeTrack(oldTrack);
+        // Add the new track to the local stream.
+        if (track)
+            this._sendStream.addTrack(track);
+    }
+    async setMaxSpatialLayer(localId, spatialLayer) {
+        this._assertSendDirection();
+        logger.debug('setMaxSpatialLayer() [localId:%s, spatialLayer:%s]', localId, spatialLayer);
+        const rtpSender = this._mapSendLocalIdRtpSender.get(localId);
+        if (!rtpSender)
+            throw new Error('associated RTCRtpSender not found');
+        const parameters = rtpSender.getParameters();
+        parameters.encodings.forEach((encoding, idx) => {
+            if (idx <= spatialLayer)
+                encoding.active = true;
+            else
+                encoding.active = false;
+        });
+        await rtpSender.setParameters(parameters);
+    }
+    async setRtpEncodingParameters(localId, params) {
+        this._assertSendDirection();
+        logger.debug('setRtpEncodingParameters() [localId:%s, params:%o]', localId, params);
+        const rtpSender = this._mapSendLocalIdRtpSender.get(localId);
+        if (!rtpSender)
+            throw new Error('associated RTCRtpSender not found');
+        const parameters = rtpSender.getParameters();
+        parameters.encodings.forEach((encoding, idx) => {
+            parameters.encodings[idx] = Object.assign(Object.assign({}, encoding), params);
+        });
+        await rtpSender.setParameters(parameters);
+    }
+    async getSenderStats(localId) {
+        this._assertSendDirection();
+        const rtpSender = this._mapSendLocalIdRtpSender.get(localId);
+        if (!rtpSender)
+            throw new Error('associated RTCRtpSender not found');
+        return rtpSender.getStats();
+    }
+    async sendDataChannel({ ordered, maxPacketLifeTime, maxRetransmits, label, protocol }) {
+        this._assertSendDirection();
+        const options = {
+            negotiated: true,
+            id: this._nextSendSctpStreamId,
+            ordered,
+            maxPacketLifeTime,
+            maxRetransmits,
+            protocol
+        };
+        logger.debug('sendDataChannel() [options:%o]', options);
+        const dataChannel = this._pc.createDataChannel(label, options);
+        // Increase next id.
+        this._nextSendSctpStreamId =
+            ++this._nextSendSctpStreamId % SCTP_NUM_STREAMS.MIS;
+        // If this is the first DataChannel we need to create the SDP answer with
+        // m=application section.
+        if (!this._hasDataChannelMediaSection) {
+            const offer = await this._pc.createOffer();
+            const localSdpObject = sdpTransform.parse(offer.sdp);
+            const offerMediaObject = localSdpObject.media
+                .find((m) => m.type === 'application');
+            if (!this._transportReady)
+                await this._setupTransport({ localDtlsRole: 'server', localSdpObject });
+            logger.debug('sendDataChannel() | calling pc.setLocalDescription() [offer:%o]', offer);
+            await this._pc.setLocalDescription(offer);
+            this._remoteSdp.sendSctpAssociation({ offerMediaObject });
+            const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
+            logger.debug('sendDataChannel() | calling pc.setRemoteDescription() [answer:%o]', answer);
+            await this._pc.setRemoteDescription(answer);
+            this._hasDataChannelMediaSection = true;
+        }
+        const sctpStreamParameters = {
+            streamId: options.id,
+            ordered: options.ordered,
+            maxPacketLifeTime: options.maxPacketLifeTime,
+            maxRetransmits: options.maxRetransmits
+        };
+        return { dataChannel, sctpStreamParameters };
+    }
+    async receive({ trackId, kind, rtpParameters }) {
+        this._assertRecvDirection();
+        logger.debug('receive() [trackId:%s, kind:%s]', trackId, kind);
+        const localId = trackId;
+        const mid = kind;
+        this._remoteSdp.receive({
+            mid,
+            kind,
+            offerRtpParameters: rtpParameters,
+            streamId: rtpParameters.rtcp.cname,
+            trackId
+        });
+        const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
+        logger.debug('receive() | calling pc.setRemoteDescription() [offer:%o]', offer);
+        await this._pc.setRemoteDescription(offer);
+        let answer = await this._pc.createAnswer();
+        const localSdpObject = sdpTransform.parse(answer.sdp);
+        const answerMediaObject = localSdpObject.media
+            .find((m) => String(m.mid) === mid);
+        // May need to modify codec parameters in the answer based on codec
+        // parameters in the offer.
+        sdpCommonUtils.applyCodecParameters({
+            offerRtpParameters: rtpParameters,
+            answerMediaObject
+        });
+        answer = { type: 'answer', sdp: sdpTransform.write(localSdpObject) };
+        if (!this._transportReady)
+            await this._setupTransport({ localDtlsRole: 'client', localSdpObject });
+        logger.debug('receive() | calling pc.setLocalDescription() [answer:%o]', answer);
+        await this._pc.setLocalDescription(answer);
+        const rtpReceiver = this._pc.getReceivers()
+            .find((r) => r.track && r.track.id === localId);
+        if (!rtpReceiver)
+            throw new Error('new RTCRtpReceiver not');
+        // Insert into the map.
+        this._mapRecvLocalIdInfo.set(localId, { mid, rtpParameters, rtpReceiver });
+        return {
+            localId,
+            track: rtpReceiver.track,
+            rtpReceiver
+        };
+    }
+    async stopReceiving(localId) {
+        this._assertRecvDirection();
+        logger.debug('stopReceiving() [localId:%s]', localId);
+        const { mid, rtpParameters } = this._mapRecvLocalIdInfo.get(localId) || {};
+        // Remove from the map.
+        this._mapRecvLocalIdInfo.delete(localId);
+        this._remoteSdp.planBStopReceiving({ mid: mid, offerRtpParameters: rtpParameters });
+        const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
+        logger.debug('stopReceiving() | calling pc.setRemoteDescription() [offer:%o]', offer);
+        await this._pc.setRemoteDescription(offer);
+        const answer = await this._pc.createAnswer();
+        logger.debug('stopReceiving() | calling pc.setLocalDescription() [answer:%o]', answer);
+        await this._pc.setLocalDescription(answer);
+    }
+    async getReceiverStats(localId) {
+        this._assertRecvDirection();
+        const { rtpReceiver } = this._mapRecvLocalIdInfo.get(localId) || {};
+        if (!rtpReceiver)
+            throw new Error('associated RTCRtpReceiver not found');
+        return rtpReceiver.getStats();
+    }
+    async receiveDataChannel({ sctpStreamParameters, label, protocol }) {
+        this._assertRecvDirection();
+        const { streamId, ordered, maxPacketLifeTime, maxRetransmits } = sctpStreamParameters;
+        const options = {
+            negotiated: true,
+            id: streamId,
+            ordered,
+            maxPacketLifeTime,
+            maxRetransmits,
+            protocol
+        };
+        logger.debug('receiveDataChannel() [options:%o]', options);
+        const dataChannel = this._pc.createDataChannel(label, options);
+        // If this is the first DataChannel we need to create the SDP offer with
+        // m=application section.
+        if (!this._hasDataChannelMediaSection) {
+            this._remoteSdp.receiveSctpAssociation({ oldDataChannelSpec: true });
+            const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
+            logger.debug('receiveDataChannel() | calling pc.setRemoteDescription() [offer:%o]', offer);
+            await this._pc.setRemoteDescription(offer);
+            const answer = await this._pc.createAnswer();
+            if (!this._transportReady) {
+                const localSdpObject = sdpTransform.parse(answer.sdp);
+                await this._setupTransport({ localDtlsRole: 'client', localSdpObject });
+            }
+            logger.debug('receiveDataChannel() | calling pc.setRemoteDescription() [answer:%o]', answer);
+            await this._pc.setLocalDescription(answer);
+            this._hasDataChannelMediaSection = true;
+        }
+        return { dataChannel };
+    }
+    async _setupTransport({ localDtlsRole, localSdpObject }) {
+        if (!localSdpObject)
+            localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
+        // Get our local DTLS parameters.
+        const dtlsParameters = sdpCommonUtils.extractDtlsParameters({ sdpObject: localSdpObject });
+        // Set our DTLS role.
+        dtlsParameters.role = localDtlsRole;
+        // Update the remote DTLS role in the SDP.
+        this._remoteSdp.updateDtlsRole(localDtlsRole === 'client' ? 'server' : 'client');
+        // Need to tell the remote transport about our parameters.
+        await this.safeEmitAsPromise('@connect', { dtlsParameters });
+        this._transportReady = true;
+    }
+    _assertSendDirection() {
+        if (this._direction !== 'send') {
+            throw new Error('method can just be called for handlers with "send" direction');
+        }
+    }
+    _assertRecvDirection() {
+        if (this._direction !== 'recv') {
+            throw new Error('method can just be called for handlers with "recv" direction');
+        }
+    }
+}
+exports.Safari11 = Safari11;
+
+},{"../Logger":13,"../ortc":36,"../utils":39,"./HandlerInterface":25,"./sdp/RemoteSdp":31,"./sdp/commonUtils":32,"./sdp/planBUtils":33,"sdp-transform":44}],28:[function(require,module,exports){
+"use strict";
+var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
+}) : (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    o[k2] = m[k];
+}));
+var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
+    Object.defineProperty(o, "default", { enumerable: true, value: v });
+}) : function(o, v) {
+    o["default"] = v;
+});
+var __importStar = (this && this.__importStar) || function (mod) {
+    if (mod && mod.__esModule) return mod;
+    var result = {};
+    if (mod != null) for (var k in mod) if (k !== "default" && Object.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
+    __setModuleDefault(result, mod);
+    return result;
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.Safari12 = void 0;
+const sdpTransform = __importStar(require("sdp-transform"));
+const Logger_1 = require("../Logger");
+const utils = __importStar(require("../utils"));
+const ortc = __importStar(require("../ortc"));
+const sdpCommonUtils = __importStar(require("./sdp/commonUtils"));
+const sdpUnifiedPlanUtils = __importStar(require("./sdp/unifiedPlanUtils"));
+const HandlerInterface_1 = require("./HandlerInterface");
+const RemoteSdp_1 = require("./sdp/RemoteSdp");
+const logger = new Logger_1.Logger('Safari12');
+const SCTP_NUM_STREAMS = { OS: 1024, MIS: 1024 };
+class Safari12 extends HandlerInterface_1.HandlerInterface {
+    constructor() {
+        super();
+        // Map of RTCTransceivers indexed by MID.
+        this._mapMidTransceiver = new Map();
+        // Local stream for sending.
+        this._sendStream = new MediaStream();
+        // Whether a DataChannel m=application section has been created.
+        this._hasDataChannelMediaSection = false;
+        // Sending DataChannel id value counter. Incremented for each new DataChannel.
+        this._nextSendSctpStreamId = 0;
+        // Got transport local and remote parameters.
+        this._transportReady = false;
+    }
+    /**
+     * Creates a factory function.
+     */
+    static createFactory() {
+        return () => new Safari12();
+    }
+    get name() {
+        return 'Safari12';
+    }
+    close() {
+        logger.debug('close()');
+        // Close RTCPeerConnection.
+        if (this._pc) {
+            try {
+                this._pc.close();
+            }
+            catch (error) { }
+        }
+    }
+    async getNativeRtpCapabilities() {
+        logger.debug('getNativeRtpCapabilities()');
+        const pc = new RTCPeerConnection({
+            iceServers: [],
+            iceTransportPolicy: 'all',
+            bundlePolicy: 'max-bundle',
+            rtcpMuxPolicy: 'require'
+        });
+        try {
+            pc.addTransceiver('audio');
+            pc.addTransceiver('video');
+            const offer = await pc.createOffer();
+            try {
+                pc.close();
+            }
+            catch (error) { }
+            const sdpObject = sdpTransform.parse(offer.sdp);
+            const nativeRtpCapabilities = sdpCommonUtils.extractRtpCapabilities({ sdpObject });
+            return nativeRtpCapabilities;
+        }
+        catch (error) {
+            try {
+                pc.close();
+            }
+            catch (error2) { }
+            throw error;
+        }
+    }
+    async getNativeSctpCapabilities() {
+        logger.debug('getNativeSctpCapabilities()');
+        return {
+            numStreams: SCTP_NUM_STREAMS
+        };
+    }
+    run({ direction, iceParameters, iceCandidates, dtlsParameters, sctpParameters, iceServers, iceTransportPolicy, additionalSettings, proprietaryConstraints, extendedRtpCapabilities }) {
+        logger.debug('run()');
+        this._direction = direction;
+        this._remoteSdp = new RemoteSdp_1.RemoteSdp({
+            iceParameters,
+            iceCandidates,
+            dtlsParameters,
+            sctpParameters
+        });
+        this._sendingRtpParametersByKind =
+            {
+                audio: ortc.getSendingRtpParameters('audio', extendedRtpCapabilities),
+                video: ortc.getSendingRtpParameters('video', extendedRtpCapabilities)
+            };
+        this._sendingRemoteRtpParametersByKind =
+            {
+                audio: ortc.getSendingRemoteRtpParameters('audio', extendedRtpCapabilities),
+                video: ortc.getSendingRemoteRtpParameters('video', extendedRtpCapabilities)
+            };
+        this._pc = new RTCPeerConnection(Object.assign({ iceServers: iceServers || [], iceTransportPolicy: iceTransportPolicy || 'all', bundlePolicy: 'max-bundle', rtcpMuxPolicy: 'require' }, additionalSettings), proprietaryConstraints);
+        // Handle RTCPeerConnection connection status.
+        this._pc.addEventListener('iceconnectionstatechange', () => {
+            switch (this._pc.iceConnectionState) {
+                case 'checking':
+                    this.emit('@connectionstatechange', 'connecting');
+                    break;
+                case 'connected':
+                case 'completed':
+                    this.emit('@connectionstatechange', 'connected');
+                    break;
+                case 'failed':
+                    this.emit('@connectionstatechange', 'failed');
+                    break;
+                case 'disconnected':
+                    this.emit('@connectionstatechange', 'disconnected');
+                    break;
+                case 'closed':
+                    this.emit('@connectionstatechange', 'closed');
+                    break;
+            }
+        });
+    }
+    async updateIceServers(iceServers) {
+        logger.debug('updateIceServers()');
+        const configuration = this._pc.getConfiguration();
+        configuration.iceServers = iceServers;
+        this._pc.setConfiguration(configuration);
+    }
+    async restartIce(iceParameters) {
+        logger.debug('restartIce()');
+        // Provide the remote SDP handler with new remote ICE parameters.
+        this._remoteSdp.updateIceParameters(iceParameters);
+        if (!this._transportReady)
+            return;
+        if (this._direction === 'send') {
+            const offer = await this._pc.createOffer({ iceRestart: true });
+            logger.debug('restartIce() | calling pc.setLocalDescription() [offer:%o]', offer);
+            await this._pc.setLocalDescription(offer);
+            const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
+            logger.debug('restartIce() | calling pc.setRemoteDescription() [answer:%o]', answer);
+            await this._pc.setRemoteDescription(answer);
+        }
+        else {
+            const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
+            logger.debug('restartIce() | calling pc.setRemoteDescription() [offer:%o]', offer);
+            await this._pc.setRemoteDescription(offer);
+            const answer = await this._pc.createAnswer();
+            logger.debug('restartIce() | calling pc.setLocalDescription() [answer:%o]', answer);
+            await this._pc.setLocalDescription(answer);
+        }
+    }
+    async getTransportStats() {
+        return this._pc.getStats();
+    }
+    async send({ track, encodings, codecOptions, codec }) {
+        this._assertSendDirection();
+        logger.debug('send() [kind:%s, track.id:%s]', track.kind, track.id);
+        const sendingRtpParameters = utils.clone(this._sendingRtpParametersByKind[track.kind], {});
+        // This may throw.
+        sendingRtpParameters.codecs =
+            ortc.reduceCodecs(sendingRtpParameters.codecs, codec);
+        const sendingRemoteRtpParameters = utils.clone(this._sendingRemoteRtpParametersByKind[track.kind], {});
+        // This may throw.
+        sendingRemoteRtpParameters.codecs =
+            ortc.reduceCodecs(sendingRemoteRtpParameters.codecs, codec);
+        const mediaSectionIdx = this._remoteSdp.getNextMediaSectionIdx();
+        const transceiver = this._pc.addTransceiver(track, { direction: 'sendonly', streams: [this._sendStream] });
+        let offer = await this._pc.createOffer();
+        let localSdpObject = sdpTransform.parse(offer.sdp);
+        let offerMediaObject;
+        if (!this._transportReady)
+            await this._setupTransport({ localDtlsRole: 'server', localSdpObject });
+        if (encodings && encodings.length > 1) {
+            logger.debug('send() | enabling legacy simulcast');
+            localSdpObject = sdpTransform.parse(offer.sdp);
+            offerMediaObject = localSdpObject.media[mediaSectionIdx.idx];
+            sdpUnifiedPlanUtils.addLegacySimulcast({
+                offerMediaObject,
+                numStreams: encodings.length
+            });
+            offer = { type: 'offer', sdp: sdpTransform.write(localSdpObject) };
+        }
+        logger.debug('send() | calling pc.setLocalDescription() [offer:%o]', offer);
+        await this._pc.setLocalDescription(offer);
+        // We can now get the transceiver.mid.
+        const localId = transceiver.mid;
+        // Set MID.
+        sendingRtpParameters.mid = localId;
+        localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
+        offerMediaObject = localSdpObject.media[mediaSectionIdx.idx];
+        // Set RTCP CNAME.
+        sendingRtpParameters.rtcp.cname =
+            sdpCommonUtils.getCname({ offerMediaObject });
+        // Set RTP encodings.
+        sendingRtpParameters.encodings =
+            sdpUnifiedPlanUtils.getRtpEncodings({ offerMediaObject });
+        // Complete encodings with given values.
+        if (encodings) {
+            for (let idx = 0; idx < sendingRtpParameters.encodings.length; ++idx) {
+                if (encodings[idx])
+                    Object.assign(sendingRtpParameters.encodings[idx], encodings[idx]);
+            }
+        }
+        // If VP8 or H264 and there is effective simulcast, add scalabilityMode to
+        // each encoding.
+        if (sendingRtpParameters.encodings.length > 1 &&
+            (sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/vp8' ||
+                sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/h264')) {
+            for (const encoding of sendingRtpParameters.encodings) {
+                encoding.scalabilityMode = 'S1T3';
+            }
+        }
+        this._remoteSdp.send({
+            offerMediaObject,
+            reuseMid: mediaSectionIdx.reuseMid,
+            offerRtpParameters: sendingRtpParameters,
+            answerRtpParameters: sendingRemoteRtpParameters,
+            codecOptions
+        });
+        const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
+        logger.debug('send() | calling pc.setRemoteDescription() [answer:%o]', answer);
+        await this._pc.setRemoteDescription(answer);
+        // Store in the map.
+        this._mapMidTransceiver.set(localId, transceiver);
+        return {
+            localId,
+            rtpParameters: sendingRtpParameters,
+            rtpSender: transceiver.sender
+        };
+    }
+    async stopSending(localId) {
+        this._assertSendDirection();
+        logger.debug('stopSending() [localId:%s]', localId);
+        const transceiver = this._mapMidTransceiver.get(localId);
+        if (!transceiver)
+            throw new Error('associated RTCRtpTransceiver not found');
+        transceiver.sender.replaceTrack(null);
+        this._pc.removeTrack(transceiver.sender);
+        this._remoteSdp.closeMediaSection(transceiver.mid);
+        const offer = await this._pc.createOffer();
+        logger.debug('stopSending() | calling pc.setLocalDescription() [offer:%o]', offer);
+        await this._pc.setLocalDescription(offer);
+        const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
+        logger.debug('stopSending() | calling pc.setRemoteDescription() [answer:%o]', answer);
+        await this._pc.setRemoteDescription(answer);
+    }
+    async replaceTrack(localId, track) {
+        this._assertSendDirection();
+        if (track) {
+            logger.debug('replaceTrack() [localId:%s, track.id:%s]', localId, track.id);
+        }
+        else {
+            logger.debug('replaceTrack() [localId:%s, no track]', localId);
+        }
+        const transceiver = this._mapMidTransceiver.get(localId);
+        if (!transceiver)
+            throw new Error('associated RTCRtpTransceiver not found');
+        await transceiver.sender.replaceTrack(track);
+    }
+    async setMaxSpatialLayer(localId, spatialLayer) {
+        this._assertSendDirection();
+        logger.debug('setMaxSpatialLayer() [localId:%s, spatialLayer:%s]', localId, spatialLayer);
+        const transceiver = this._mapMidTransceiver.get(localId);
+        if (!transceiver)
+            throw new Error('associated RTCRtpTransceiver not found');
+        const parameters = transceiver.sender.getParameters();
+        parameters.encodings.forEach((encoding, idx) => {
+            if (idx <= spatialLayer)
+                encoding.active = true;
+            else
+                encoding.active = false;
+        });
+        await transceiver.sender.setParameters(parameters);
+    }
+    async setRtpEncodingParameters(localId, params) {
+        this._assertSendDirection();
+        logger.debug('setRtpEncodingParameters() [localId:%s, params:%o]', localId, params);
+        const transceiver = this._mapMidTransceiver.get(localId);
+        if (!transceiver)
+            throw new Error('associated RTCRtpTransceiver not found');
+        const parameters = transceiver.sender.getParameters();
+        parameters.encodings.forEach((encoding, idx) => {
+            parameters.encodings[idx] = Object.assign(Object.assign({}, encoding), params);
+        });
+        await transceiver.sender.setParameters(parameters);
+    }
+    async getSenderStats(localId) {
+        this._assertSendDirection();
+        const transceiver = this._mapMidTransceiver.get(localId);
+        if (!transceiver)
+            throw new Error('associated RTCRtpTransceiver not found');
+        return transceiver.sender.getStats();
+    }
+    async sendDataChannel({ ordered, maxPacketLifeTime, maxRetransmits, label, protocol }) {
+        this._assertSendDirection();
+        const options = {
+            negotiated: true,
+            id: this._nextSendSctpStreamId,
+            ordered,
+            maxPacketLifeTime,
+            maxRetransmits,
+            protocol
+        };
+        logger.debug('sendDataChannel() [options:%o]', options);
+        const dataChannel = this._pc.createDataChannel(label, options);
+        // Increase next id.
+        this._nextSendSctpStreamId =
+            ++this._nextSendSctpStreamId % SCTP_NUM_STREAMS.MIS;
+        // If this is the first DataChannel we need to create the SDP answer with
+        // m=application section.
+        if (!this._hasDataChannelMediaSection) {
+            const offer = await this._pc.createOffer();
+            const localSdpObject = sdpTransform.parse(offer.sdp);
+            const offerMediaObject = localSdpObject.media
+                .find((m) => m.type === 'application');
+            if (!this._transportReady)
+                await this._setupTransport({ localDtlsRole: 'server', localSdpObject });
+            logger.debug('sendDataChannel() | calling pc.setLocalDescription() [offer:%o]', offer);
+            await this._pc.setLocalDescription(offer);
+            this._remoteSdp.sendSctpAssociation({ offerMediaObject });
+            const answer = { type: 'answer', sdp: this._remoteSdp.getSdp() };
+            logger.debug('sendDataChannel() | calling pc.setRemoteDescription() [answer:%o]', answer);
+            await this._pc.setRemoteDescription(answer);
+            this._hasDataChannelMediaSection = true;
+        }
+        const sctpStreamParameters = {
+            streamId: options.id,
+            ordered: options.ordered,
+            maxPacketLifeTime: options.maxPacketLifeTime,
+            maxRetransmits: options.maxRetransmits
+        };
+        return { dataChannel, sctpStreamParameters };
+    }
+    async receive({ trackId, kind, rtpParameters }) {
+        this._assertRecvDirection();
+        logger.debug('receive() [trackId:%s, kind:%s]', trackId, kind);
+        const localId = rtpParameters.mid || String(this._mapMidTransceiver.size);
+        this._remoteSdp.receive({
+            mid: localId,
+            kind,
+            offerRtpParameters: rtpParameters,
+            streamId: rtpParameters.rtcp.cname,
+            trackId
+        });
+        const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
+        logger.debug('receive() | calling pc.setRemoteDescription() [offer:%o]', offer);
+        await this._pc.setRemoteDescription(offer);
+        let answer = await this._pc.createAnswer();
+        const localSdpObject = sdpTransform.parse(answer.sdp);
+        const answerMediaObject = localSdpObject.media
+            .find((m) => String(m.mid) === localId);
+        // May need to modify codec parameters in the answer based on codec
+        // parameters in the offer.
+        sdpCommonUtils.applyCodecParameters({
+            offerRtpParameters: rtpParameters,
+            answerMediaObject
+        });
+        answer = { type: 'answer', sdp: sdpTransform.write(localSdpObject) };
+        if (!this._transportReady)
+            await this._setupTransport({ localDtlsRole: 'client', localSdpObject });
+        logger.debug('receive() | calling pc.setLocalDescription() [answer:%o]', answer);
+        await this._pc.setLocalDescription(answer);
+        const transceiver = this._pc.getTransceivers()
+            .find((t) => t.mid === localId);
+        if (!transceiver)
+            throw new Error('new RTCRtpTransceiver not found');
+        // Store in the map.
+        this._mapMidTransceiver.set(localId, transceiver);
+        return {
+            localId,
+            track: transceiver.receiver.track,
+            rtpReceiver: transceiver.receiver
+        };
+    }
+    async stopReceiving(localId) {
+        this._assertRecvDirection();
+        logger.debug('stopReceiving() [localId:%s]', localId);
+        const transceiver = this._mapMidTransceiver.get(localId);
+        if (!transceiver)
+            throw new Error('associated RTCRtpTransceiver not found');
+        this._remoteSdp.closeMediaSection(transceiver.mid);
+        const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
+        logger.debug('stopReceiving() | calling pc.setRemoteDescription() [offer:%o]', offer);
+        await this._pc.setRemoteDescription(offer);
+        const answer = await this._pc.createAnswer();
+        logger.debug('stopReceiving() | calling pc.setLocalDescription() [answer:%o]', answer);
+        await this._pc.setLocalDescription(answer);
+    }
+    async getReceiverStats(localId) {
+        this._assertRecvDirection();
+        const transceiver = this._mapMidTransceiver.get(localId);
+        if (!transceiver)
+            throw new Error('associated RTCRtpTransceiver not found');
+        return transceiver.receiver.getStats();
+    }
+    async receiveDataChannel({ sctpStreamParameters, label, protocol }) {
+        this._assertRecvDirection();
+        const { streamId, ordered, maxPacketLifeTime, maxRetransmits } = sctpStreamParameters;
+        const options = {
+            negotiated: true,
+            id: streamId,
+            ordered,
+            maxPacketLifeTime,
+            maxRetransmits,
+            protocol
+        };
+        logger.debug('receiveDataChannel() [options:%o]', options);
+        const dataChannel = this._pc.createDataChannel(label, options);
+        // If this is the first DataChannel we need to create the SDP offer with
+        // m=application section.
+        if (!this._hasDataChannelMediaSection) {
+            this._remoteSdp.receiveSctpAssociation();
+            const offer = { type: 'offer', sdp: this._remoteSdp.getSdp() };
+            logger.debug('receiveDataChannel() | calling pc.setRemoteDescription() [offer:%o]', offer);
+            await this._pc.setRemoteDescription(offer);
+            const answer = await this._pc.createAnswer();
+            if (!this._transportReady) {
+                const localSdpObject = sdpTransform.parse(answer.sdp);
+                await this._setupTransport({ localDtlsRole: 'client', localSdpObject });
+            }
+            logger.debug('receiveDataChannel() | calling pc.setRemoteDescription() [answer:%o]', answer);
+            await this._pc.setLocalDescription(answer);
+            this._hasDataChannelMediaSection = true;
+        }
+        return { dataChannel };
+    }
+    async _setupTransport({ localDtlsRole, localSdpObject }) {
+        if (!localSdpObject)
+            localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
+        // Get our local DTLS parameters.
+        const dtlsParameters = sdpCommonUtils.extractDtlsParameters({ sdpObject: localSdpObject });
+        // Set our DTLS role.
+        dtlsParameters.role = localDtlsRole;
+        // Update the remote DTLS role in the SDP.
+        this._remoteSdp.updateDtlsRole(localDtlsRole === 'client' ? 'server' : 'client');
+        // Need to tell the remote transport about our parameters.
+        await this.safeEmitAsPromise('@connect', { dtlsParameters });
+        this._transportReady = true;
+    }
+    _assertSendDirection() {
+        if (this._direction !== 'send') {
+            throw new Error('method can just be called for handlers with "send" direction');
+        }
+    }
+    _assertRecvDirection() {
+        if (this._direction !== 'recv') {
+            throw new Error('method can just be called for handlers with "recv" direction');
+        }
+    }
+}
+exports.Safari12 = Safari12;
+
+},{"../Logger":13,"../ortc":36,"../utils":39,"./HandlerInterface":25,"./sdp/RemoteSdp":31,"./sdp/commonUtils":32,"./sdp/unifiedPlanUtils":34,"sdp-transform":44}],29:[function(require,module,exports){
+"use strict";
+var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
+}) : (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    o[k2] = m[k];
+}));
+var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
+    Object.defineProperty(o, "default", { enumerable: true, value: v });
+}) : function(o, v) {
+    o["default"] = v;
+});
+var __importStar = (this && this.__importStar) || function (mod) {
+    if (mod && mod.__esModule) return mod;
+    var result = {};
+    if (mod != null) for (var k in mod) if (k !== "default" && Object.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
+    __setModuleDefault(result, mod);
+    return result;
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.mangleRtpParameters = exports.getCapabilities = void 0;
+const utils = __importStar(require("../../utils"));
+/**
+ * Normalize ORTC based Edge's RTCRtpReceiver.getCapabilities() to produce a full
+ * compliant ORTC RTCRtpCapabilities.
+ */
+function getCapabilities() {
+    const nativeCaps = RTCRtpReceiver.getCapabilities();
+    const caps = utils.clone(nativeCaps, {});
+    for (const codec of caps.codecs) {
+        // Rename numChannels to channels.
+        codec.channels = codec.numChannels;
+        delete codec.numChannels;
+        // Add mimeType.
+        codec.mimeType = codec.mimeType || `${codec.kind}/${codec.name}`;
+        // NOTE: Edge sets some numeric parameters as string rather than number. Fix them.
+        if (codec.parameters) {
+            const parameters = codec.parameters;
+            if (parameters.apt)
+                parameters.apt = Number(parameters.apt);
+            if (parameters['packetization-mode'])
+                parameters['packetization-mode'] = Number(parameters['packetization-mode']);
+        }
+        // Delete emty parameter String in rtcpFeedback.
+        for (const feedback of codec.rtcpFeedback || []) {
+            if (!feedback.parameter)
+                feedback.parameter = '';
+        }
+    }
+    return caps;
+}
+exports.getCapabilities = getCapabilities;
+/**
+ * Generate RTCRtpParameters as ORTC based Edge likes.
+ */
+function mangleRtpParameters(rtpParameters) {
+    const params = utils.clone(rtpParameters, {});
+    // Rename mid to muxId.
+    if (params.mid) {
+        params.muxId = params.mid;
+        delete params.mid;
+    }
+    for (const codec of params.codecs) {
+        // Rename channels to numChannels.
+        if (codec.channels) {
+            codec.numChannels = codec.channels;
+            delete codec.channels;
+        }
+        // Add codec.name (requried by Edge).
+        if (codec.mimeType && !codec.name)
+            codec.name = codec.mimeType.split('/')[1];
+        // Remove mimeType.
+        delete codec.mimeType;
+    }
+    return params;
+}
+exports.mangleRtpParameters = mangleRtpParameters;
+
+},{"../../utils":39}],30:[function(require,module,exports){
+"use strict";
+var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
+}) : (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    o[k2] = m[k];
+}));
+var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
+    Object.defineProperty(o, "default", { enumerable: true, value: v });
+}) : function(o, v) {
+    o["default"] = v;
+});
+var __importStar = (this && this.__importStar) || function (mod) {
+    if (mod && mod.__esModule) return mod;
+    var result = {};
+    if (mod != null) for (var k in mod) if (k !== "default" && Object.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
+    __setModuleDefault(result, mod);
+    return result;
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.OfferMediaSection = exports.AnswerMediaSection = exports.MediaSection = void 0;
+const utils = __importStar(require("../../utils"));
+class MediaSection {
+    constructor({ iceParameters, iceCandidates, dtlsParameters, planB = false }) {
+        this._mediaObject = {};
+        this._planB = planB;
+        if (iceParameters) {
+            this.setIceParameters(iceParameters);
+        }
+        if (iceCandidates) {
+            this._mediaObject.candidates = [];
+            for (const candidate of iceCandidates) {
+                const candidateObject = {};
+                // mediasoup does mandates rtcp-mux so candidates component is always
+                // RTP (1).
+                candidateObject.component = 1;
+                candidateObject.foundation = candidate.foundation;
+                candidateObject.ip = candidate.ip;
+                candidateObject.port = candidate.port;
+                candidateObject.priority = candidate.priority;
+                candidateObject.transport = candidate.protocol;
+                candidateObject.type = candidate.type;
+                if (candidate.tcpType)
+                    candidateObject.tcptype = candidate.tcpType;
+                this._mediaObject.candidates.push(candidateObject);
+            }
+            this._mediaObject.endOfCandidates = 'end-of-candidates';
+            this._mediaObject.iceOptions = 'renomination';
+        }
+        if (dtlsParameters) {
+            this.setDtlsRole(dtlsParameters.role);
+        }
+    }
+    get mid() {
+        return String(this._mediaObject.mid);
+    }
+    get closed() {
+        return this._mediaObject.port === 0;
+    }
+    getObject() {
+        return this._mediaObject;
+    }
+    setIceParameters(iceParameters) {
+        this._mediaObject.iceUfrag = iceParameters.usernameFragment;
+        this._mediaObject.icePwd = iceParameters.password;
+    }
+    disable() {
+        this._mediaObject.direction = 'inactive';
+        delete this._mediaObject.ext;
+        delete this._mediaObject.ssrcs;
+        delete this._mediaObject.ssrcGroups;
+        delete this._mediaObject.simulcast;
+        delete this._mediaObject.simulcast_03;
+        delete this._mediaObject.rids;
+    }
+    close() {
+        this._mediaObject.direction = 'inactive';
+        this._mediaObject.port = 0;
+        delete this._mediaObject.ext;
+        delete this._mediaObject.ssrcs;
+        delete this._mediaObject.ssrcGroups;
+        delete this._mediaObject.simulcast;
+        delete this._mediaObject.simulcast_03;
+        delete this._mediaObject.rids;
+        delete this._mediaObject.extmapAllowMixed;
+    }
+}
+exports.MediaSection = MediaSection;
+class AnswerMediaSection extends MediaSection {
+    constructor({ iceParameters, iceCandidates, dtlsParameters, sctpParameters, plainRtpParameters, planB = false, offerMediaObject, offerRtpParameters, answerRtpParameters, codecOptions, extmapAllowMixed = false }) {
+        super({ iceParameters, iceCandidates, dtlsParameters, planB });
+        this._mediaObject.mid = String(offerMediaObject.mid);
+        this._mediaObject.type = offerMediaObject.type;
+        this._mediaObject.protocol = offerMediaObject.protocol;
+        if (!plainRtpParameters) {
+            this._mediaObject.connection = { ip: '127.0.0.1', version: 4 };
+            this._mediaObject.port = 7;
+        }
+        else {
+            this._mediaObject.connection =
+                {
+                    ip: plainRtpParameters.ip,
+                    version: plainRtpParameters.ipVersion
+                };
+            this._mediaObject.port = plainRtpParameters.port;
+        }
+        switch (offerMediaObject.type) {
+            case 'audio':
+            case 'video':
+                {
+                    this._mediaObject.direction = 'recvonly';
+                    this._mediaObject.rtp = [];
+                    this._mediaObject.rtcpFb = [];
+                    this._mediaObject.fmtp = [];
+                    for (const codec of answerRtpParameters.codecs) {
+                        const rtp = {
+                            payload: codec.payloadType,
+                            codec: getCodecName(codec),
+                            rate: codec.clockRate
                         };
-                        rtpParameters.headerExtensions.push(ext);
-                    }
-                    // Reduce codecs' RTCP feedback. Use Transport-CC if available, REMB otherwise.
-                    if (
-                        rtpParameters.headerExtensions.some(
-                            (ext) =>
-                                ext.uri === 'http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01',
-                        )
-                    ) {
-                        for (const codec of rtpParameters.codecs) {
-                            codec.rtcpFeedback = (codec.rtcpFeedback || []).filter((fb) => fb.type !== 'goog-remb');
-                        }
-                    } else if (
-                        rtpParameters.headerExtensions.some(
-                            (ext) => ext.uri === 'http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time',
-                        )
-                    ) {
-                        for (const codec of rtpParameters.codecs) {
-                            codec.rtcpFeedback = (codec.rtcpFeedback || []).filter((fb) => fb.type !== 'transport-cc');
-                        }
-                    } else {
-                        for (const codec of rtpParameters.codecs) {
-                            codec.rtcpFeedback = (codec.rtcpFeedback || []).filter(
-                                (fb) => fb.type !== 'transport-cc' && fb.type !== 'goog-remb',
-                            );
-                        }
-                    }
-                    return rtpParameters;
-                }
-                exports.getSendingRemoteRtpParameters = getSendingRemoteRtpParameters;
-                /**
-                 * Reduce given codecs by returning an array of codecs "compatible" with the
-                 * given capability codec. If no capability codec is given, take the first
-                 * one(s).
-                 *
-                 * Given codecs must be generated by ortc.getSendingRtpParameters() or
-                 * ortc.getSendingRemoteRtpParameters().
-                 *
-                 * The returned array of codecs also include a RTX codec if available.
-                 */
-                function reduceCodecs(codecs, capCodec) {
-                    const filteredCodecs = [];
-                    // If no capability codec is given, take the first one (and RTX).
-                    if (!capCodec) {
-                        filteredCodecs.push(codecs[0]);
-                        if (isRtxCodec(codecs[1])) filteredCodecs.push(codecs[1]);
-                    }
-                    // Otherwise look for a compatible set of codecs.
-                    else {
-                        for (let idx = 0; idx < codecs.length; ++idx) {
-                            if (matchCodecs(codecs[idx], capCodec)) {
-                                filteredCodecs.push(codecs[idx]);
-                                if (isRtxCodec(codecs[idx + 1])) filteredCodecs.push(codecs[idx + 1]);
-                                break;
-                            }
-                        }
-                        if (filteredCodecs.length === 0) throw new TypeError('no matching codec found');
-                    }
-                    return filteredCodecs;
-                }
-                exports.reduceCodecs = reduceCodecs;
-                /**
-                 * Create RTP parameters for a Consumer for the RTP probator.
-                 */
-                function generateProbatorRtpParameters(videoRtpParameters) {
-                    // Clone given reference video RTP parameters.
-                    videoRtpParameters = utils_1.clone(videoRtpParameters);
-                    // This may throw.
-                    validateRtpParameters(videoRtpParameters);
-                    const rtpParameters = {
-                        mid: RTP_PROBATOR_MID,
-                        codecs: [],
-                        headerExtensions: [],
-                        encodings: [{ ssrc: RTP_PROBATOR_SSRC }],
-                        rtcp: { cname: 'probator' },
-                    };
-                    rtpParameters.codecs.push(videoRtpParameters.codecs[0]);
-                    rtpParameters.codecs[0].payloadType = RTP_PROBATOR_CODEC_PAYLOAD_TYPE;
-                    rtpParameters.headerExtensions = videoRtpParameters.headerExtensions;
-                    return rtpParameters;
-                }
-                exports.generateProbatorRtpParameters = generateProbatorRtpParameters;
-                /**
-                 * Whether media can be sent based on the given RTP capabilities.
-                 */
-                function canSend(kind, extendedRtpCapabilities) {
-                    return extendedRtpCapabilities.codecs.some((codec) => codec.kind === kind);
-                }
-                exports.canSend = canSend;
-                /**
-                 * Whether the given RTP parameters can be received with the given RTP
-                 * capabilities.
-                 */
-                function canReceive(rtpParameters, extendedRtpCapabilities) {
-                    // This may throw.
-                    validateRtpParameters(rtpParameters);
-                    if (rtpParameters.codecs.length === 0) return false;
-                    const firstMediaCodec = rtpParameters.codecs[0];
-                    return extendedRtpCapabilities.codecs.some(
-                        (codec) => codec.remotePayloadType === firstMediaCodec.payloadType,
-                    );
-                }
-                exports.canReceive = canReceive;
-                function isRtxCodec(codec) {
-                    if (!codec) return false;
-                    return /.+\/rtx$/i.test(codec.mimeType);
-                }
-                function matchCodecs(aCodec, bCodec, { strict = false, modify = false } = {}) {
-                    const aMimeType = aCodec.mimeType.toLowerCase();
-                    const bMimeType = bCodec.mimeType.toLowerCase();
-                    if (aMimeType !== bMimeType) return false;
-                    if (aCodec.clockRate !== bCodec.clockRate) return false;
-                    if (aCodec.channels !== bCodec.channels) return false;
-                    // Per codec special checks.
-                    switch (aMimeType) {
-                        case 'video/h264': {
-                            const aPacketizationMode = aCodec.parameters['packetization-mode'] || 0;
-                            const bPacketizationMode = bCodec.parameters['packetization-mode'] || 0;
-                            if (aPacketizationMode !== bPacketizationMode) return false;
-                            // If strict matching check profile-level-id.
-                            if (strict) {
-                                if (!h264.isSameProfile(aCodec.parameters, bCodec.parameters)) return false;
-                                let selectedProfileLevelId;
-                                try {
-                                    selectedProfileLevelId = h264.generateProfileLevelIdForAnswer(
-                                        aCodec.parameters,
-                                        bCodec.parameters,
-                                    );
-                                } catch (error) {
-                                    return false;
-                                }
-                                if (modify) {
-                                    if (selectedProfileLevelId)
-                                        aCodec.parameters['profile-level-id'] = selectedProfileLevelId;
-                                    else delete aCodec.parameters['profile-level-id'];
-                                }
-                            }
-                            break;
-                        }
-                        case 'video/vp9': {
-                            // If strict matching check profile-id.
-                            if (strict) {
-                                const aProfileId = aCodec.parameters['profile-id'] || 0;
-                                const bProfileId = bCodec.parameters['profile-id'] || 0;
-                                if (aProfileId !== bProfileId) return false;
+                        if (codec.channels > 1)
+                            rtp.encoding = codec.channels;
+                        this._mediaObject.rtp.push(rtp);
+                        const codecParameters = utils.clone(codec.parameters, {});
+                        if (codecOptions) {
+                            const { opusStereo, opusFec, opusDtx, opusMaxPlaybackRate, opusMaxAverageBitrate, opusPtime, videoGoogleStartBitrate, videoGoogleMaxBitrate, videoGoogleMinBitrate } = codecOptions;
+                            const offerCodec = offerRtpParameters.codecs
+                                .find((c) => (c.payloadType === codec.payloadType));
+                            switch (codec.mimeType.toLowerCase()) {
+                                case 'audio/opus':
+                                    {
+                                        if (opusStereo !== undefined) {
+                                            offerCodec.parameters['sprop-stereo'] = opusStereo ? 1 : 0;
+                                            codecParameters.stereo = opusStereo ? 1 : 0;
+                                        }
+                                        if (opusFec !== undefined) {
+                                            offerCodec.parameters.useinbandfec = opusFec ? 1 : 0;
+                                            codecParameters.useinbandfec = opusFec ? 1 : 0;
+                                        }
+                                        if (opusDtx !== undefined) {
+                                            offerCodec.parameters.usedtx = opusDtx ? 1 : 0;
+                                            codecParameters.usedtx = opusDtx ? 1 : 0;
+                                        }
+                                        if (opusMaxPlaybackRate !== undefined) {
+                                            codecParameters.maxplaybackrate = opusMaxPlaybackRate;
+                                        }
+                                        if (opusMaxAverageBitrate !== undefined) {
+                                            codecParameters.maxaveragebitrate = opusMaxAverageBitrate;
+                                        }
+                                        if (opusPtime !== undefined) {
+                                            offerCodec.parameters.ptime = opusPtime;
+                                            codecParameters.ptime = opusPtime;
+                                        }
+                                        break;
+                                    }
+                                case 'video/vp8':
+                                case 'video/vp9':
+                                case 'video/h264':
+                                case 'video/h265':
+                                    {
+                                        if (videoGoogleStartBitrate !== undefined)
+                                            codecParameters['x-google-start-bitrate'] = videoGoogleStartBitrate;
+                                        if (videoGoogleMaxBitrate !== undefined)
+                                            codecParameters['x-google-max-bitrate'] = videoGoogleMaxBitrate;
+                                        if (videoGoogleMinBitrate !== undefined)
+                                            codecParameters['x-google-min-bitrate'] = videoGoogleMinBitrate;
+                                        break;
+                                    }
                             }
-                            break;
                         }
-                    }
-                    return true;
-                }
-                function matchHeaderExtensions(aExt, bExt) {
-                    if (aExt.kind && bExt.kind && aExt.kind !== bExt.kind) return false;
-                    if (aExt.uri !== bExt.uri) return false;
-                    return true;
-                }
-                function reduceRtcpFeedback(codecA, codecB) {
-                    const reducedRtcpFeedback = [];
-                    for (const aFb of codecA.rtcpFeedback || []) {
-                        const matchingBFb = (codecB.rtcpFeedback || []).find(
-                            (bFb) =>
-                                bFb.type === aFb.type &&
-                                (bFb.parameter === aFb.parameter || (!bFb.parameter && !aFb.parameter)),
-                        );
-                        if (matchingBFb) reducedRtcpFeedback.push(matchingBFb);
-                    }
-                    return reducedRtcpFeedback;
-                }
-            },
-            { './utils': 36, 'h264-profile-level-id': 3 },
-        ],
-        34: [
-            function (require, module, exports) {
-                'use strict';
-                Object.defineProperty(exports, '__esModule', { value: true });
-                const ScalabilityModeRegex = new RegExp('^[LS]([1-9]\\d{0,1})T([1-9]\\d{0,1})');
-                function parse(scalabilityMode) {
-                    const match = ScalabilityModeRegex.exec(scalabilityMode || '');
-                    if (match) {
-                        return {
-                            spatialLayers: Number(match[1]),
-                            temporalLayers: Number(match[2]),
-                        };
-                    } else {
-                        return {
-                            spatialLayers: 1,
-                            temporalLayers: 1,
+                        const fmtp = {
+                            payload: codec.payloadType,
+                            config: ''
                         };
-                    }
-                }
-                exports.parse = parse;
-            },
-            {},
-        ],
-        35: [
-            function (require, module, exports) {
-                'use strict';
-                function __export(m) {
-                    for (var p in m) if (!exports.hasOwnProperty(p)) exports[p] = m[p];
-                }
-                Object.defineProperty(exports, '__esModule', { value: true });
-                __export(require('./Device'));
-                __export(require('./Transport'));
-                __export(require('./Producer'));
-                __export(require('./Consumer'));
-                __export(require('./DataProducer'));
-                __export(require('./DataConsumer'));
-                __export(require('./handlers/HandlerInterface'));
-                __export(require('./errors'));
-            },
-            {
-                './Consumer': 7,
-                './DataConsumer': 8,
-                './DataProducer': 9,
-                './Device': 10,
-                './Producer': 13,
-                './Transport': 14,
-                './errors': 15,
-                './handlers/HandlerInterface': 22,
-            },
-        ],
-        36: [
-            function (require, module, exports) {
-                'use strict';
-                Object.defineProperty(exports, '__esModule', { value: true });
-                /**
-                 * Clones the given object/array.
-                 *
-                 * @param {Object|Array} obj
-                 *
-                 * @returns {Object|Array}
-                 */
-                function clone(data) {
-                    if (typeof data !== 'object') return {};
-                    return JSON.parse(JSON.stringify(data));
-                }
-                exports.clone = clone;
-                /**
-                 * Generates a random positive integer.
-                 */
-                function generateRandomNumber() {
-                    return Math.round(Math.random() * 10000000);
-                }
-                exports.generateRandomNumber = generateRandomNumber;
-            },
-            {},
-        ],
-        37: [
-            function (require, module, exports) {
-                arguments[4][4][0].apply(exports, arguments);
-            },
-            { './common': 38, _process: 46, dup: 4 },
-        ],
-        38: [
-            function (require, module, exports) {
-                arguments[4][5][0].apply(exports, arguments);
-            },
-            { dup: 5, ms: 39 },
-        ],
-        39: [
-            function (require, module, exports) {
-                arguments[4][6][0].apply(exports, arguments);
-            },
-            { dup: 6 },
-        ],
-        40: [
-            function (require, module, exports) {
-                var grammar = (module.exports = {
-                    v: [
-                        {
-                            name: 'version',
-                            reg: /^(\d*)$/,
-                        },
-                    ],
-                    o: [
-                        {
-                            // o=- 20518 0 IN IP4 203.0.113.1
-                            // NB: sessionId will be a String in most cases because it is huge
-                            name: 'origin',
-                            reg: /^(\S*) (\d*) (\d*) (\S*) IP(\d) (\S*)/,
-                            names: ['username', 'sessionId', 'sessionVersion', 'netType', 'ipVer', 'address'],
-                            format: '%s %s %d %s IP%d %s',
-                        },
-                    ],
-                    // default parsing of these only (though some of these feel outdated)
-                    s: [{ name: 'name' }],
-                    i: [{ name: 'description' }],
-                    u: [{ name: 'uri' }],
-                    e: [{ name: 'email' }],
-                    p: [{ name: 'phone' }],
-                    z: [{ name: 'timezones' }], // TODO: this one can actually be parsed properly...
-                    r: [{ name: 'repeats' }], // TODO: this one can also be parsed properly
-                    // k: [{}], // outdated thing ignored
-                    t: [
-                        {
-                            // t=0 0
-                            name: 'timing',
-                            reg: /^(\d*) (\d*)/,
-                            names: ['start', 'stop'],
-                            format: '%d %d',
-                        },
-                    ],
-                    c: [
-                        {
-                            // c=IN IP4 10.47.197.26
-                            name: 'connection',
-                            reg: /^IN IP(\d) (\S*)/,
-                            names: ['version', 'ip'],
-                            format: 'IN IP%d %s',
-                        },
-                    ],
-                    b: [
-                        {
-                            // b=AS:4000
-                            push: 'bandwidth',
-                            reg: /^(TIAS|AS|CT|RR|RS):(\d*)/,
-                            names: ['type', 'limit'],
-                            format: '%s:%s',
-                        },
-                    ],
-                    m: [
-                        {
-                            // m=video 51744 RTP/AVP 126 97 98 34 31
-                            // NB: special - pushes to session
-                            // TODO: rtp/fmtp should be filtered by the payloads found here?
-                            reg: /^(\w*) (\d*) ([\w/]*)(?: (.*))?/,
-                            names: ['type', 'port', 'protocol', 'payloads'],
-                            format: '%s %d %s %s',
-                        },
-                    ],
-                    a: [
-                        {
-                            // a=rtpmap:110 opus/48000/2
-                            push: 'rtp',
-                            reg: /^rtpmap:(\d*) ([\w\-.]*)(?:\s*\/(\d*)(?:\s*\/(\S*))?)?/,
-                            names: ['payload', 'codec', 'rate', 'encoding'],
-                            format: function (o) {
-                                return o.encoding ? 'rtpmap:%d %s/%s/%s' : o.rate ? 'rtpmap:%d %s/%s' : 'rtpmap:%d %s';
-                            },
-                        },
-                        {
-                            // a=fmtp:108 profile-level-id=24;object=23;bitrate=64000
-                            // a=fmtp:111 minptime=10; useinbandfec=1
-                            push: 'fmtp',
-                            reg: /^fmtp:(\d*) ([\S| ]*)/,
-                            names: ['payload', 'config'],
-                            format: 'fmtp:%d %s',
-                        },
-                        {
-                            // a=control:streamid=0
-                            name: 'control',
-                            reg: /^control:(.*)/,
-                            format: 'control:%s',
-                        },
-                        {
-                            // a=rtcp:65179 IN IP4 193.84.77.194
-                            name: 'rtcp',
-                            reg: /^rtcp:(\d*)(?: (\S*) IP(\d) (\S*))?/,
-                            names: ['port', 'netType', 'ipVer', 'address'],
-                            format: function (o) {
-                                return o.address != null ? 'rtcp:%d %s IP%d %s' : 'rtcp:%d';
-                            },
-                        },
-                        {
-                            // a=rtcp-fb:98 trr-int 100
-                            push: 'rtcpFbTrrInt',
-                            reg: /^rtcp-fb:(\*|\d*) trr-int (\d*)/,
-                            names: ['payload', 'value'],
-                            format: 'rtcp-fb:%d trr-int %d',
-                        },
-                        {
-                            // a=rtcp-fb:98 nack rpsi
-                            push: 'rtcpFb',
-                            reg: /^rtcp-fb:(\*|\d*) ([\w-_]*)(?: ([\w-_]*))?/,
-                            names: ['payload', 'type', 'subtype'],
-                            format: function (o) {
-                                return o.subtype != null ? 'rtcp-fb:%s %s %s' : 'rtcp-fb:%s %s';
-                            },
-                        },
-                        {
-                            // a=extmap:2 urn:ietf:params:rtp-hdrext:toffset
-                            // a=extmap:1/recvonly URI-gps-string
-                            // a=extmap:3 urn:ietf:params:rtp-hdrext:encrypt urn:ietf:params:rtp-hdrext:smpte-tc 25@600/24
-                            push: 'ext',
-                            reg: /^extmap:(\d+)(?:\/(\w+))?(?: (urn:ietf:params:rtp-hdrext:encrypt))? (\S*)(?: (\S*))?/,
-                            names: ['value', 'direction', 'encrypt-uri', 'uri', 'config'],
-                            format: function (o) {
-                                return (
-                                    'extmap:%d' +
-                                    (o.direction ? '/%s' : '%v') +
-                                    (o['encrypt-uri'] ? ' %s' : '%v') +
-                                    ' %s' +
-                                    (o.config ? ' %s' : '')
-                                );
-                            },
-                        },
-                        {
-                            // a=extmap-allow-mixed
-                            name: 'extmapAllowMixed',
-                            reg: /^(extmap-allow-mixed)/,
-                        },
-                        {
-                            // a=crypto:1 AES_CM_128_HMAC_SHA1_80 inline:PS1uQCVeeCFCanVmcjkpPywjNWhcYD0mXXtxaVBR|2^20|1:32
-                            push: 'crypto',
-                            reg: /^crypto:(\d*) ([\w_]*) (\S*)(?: (\S*))?/,
-                            names: ['id', 'suite', 'config', 'sessionConfig'],
-                            format: function (o) {
-                                return o.sessionConfig != null ? 'crypto:%d %s %s %s' : 'crypto:%d %s %s';
-                            },
-                        },
-                        {
-                            // a=setup:actpass
-                            name: 'setup',
-                            reg: /^setup:(\w*)/,
-                            format: 'setup:%s',
-                        },
-                        {
-                            // a=connection:new
-                            name: 'connectionType',
-                            reg: /^connection:(new|existing)/,
-                            format: 'connection:%s',
-                        },
-                        {
-                            // a=mid:1
-                            name: 'mid',
-                            reg: /^mid:([^\s]*)/,
-                            format: 'mid:%s',
-                        },
-                        {
-                            // a=msid:0c8b064d-d807-43b4-b434-f92a889d8587 98178685-d409-46e0-8e16-7ef0db0db64a
-                            name: 'msid',
-                            reg: /^msid:(.*)/,
-                            format: 'msid:%s',
-                        },
-                        {
-                            // a=ptime:20
-                            name: 'ptime',
-                            reg: /^ptime:(\d*(?:\.\d*)*)/,
-                            format: 'ptime:%d',
-                        },
-                        {
-                            // a=maxptime:60
-                            name: 'maxptime',
-                            reg: /^maxptime:(\d*(?:\.\d*)*)/,
-                            format: 'maxptime:%d',
-                        },
-                        {
-                            // a=sendrecv
-                            name: 'direction',
-                            reg: /^(sendrecv|recvonly|sendonly|inactive)/,
-                        },
-                        {
-                            // a=ice-lite
-                            name: 'icelite',
-                            reg: /^(ice-lite)/,
-                        },
-                        {
-                            // a=ice-ufrag:F7gI
-                            name: 'iceUfrag',
-                            reg: /^ice-ufrag:(\S*)/,
-                            format: 'ice-ufrag:%s',
-                        },
-                        {
-                            // a=ice-pwd:x9cml/YzichV2+XlhiMu8g
-                            name: 'icePwd',
-                            reg: /^ice-pwd:(\S*)/,
-                            format: 'ice-pwd:%s',
-                        },
-                        {
-                            // a=fingerprint:SHA-1 00:11:22:33:44:55:66:77:88:99:AA:BB:CC:DD:EE:FF:00:11:22:33
-                            name: 'fingerprint',
-                            reg: /^fingerprint:(\S*) (\S*)/,
-                            names: ['type', 'hash'],
-                            format: 'fingerprint:%s %s',
-                        },
-                        {
-                            // a=candidate:0 1 UDP 2113667327 203.0.113.1 54400 typ host
-                            // a=candidate:1162875081 1 udp 2113937151 192.168.34.75 60017 typ host generation 0 network-id 3 network-cost 10
-                            // a=candidate:3289912957 2 udp 1845501695 193.84.77.194 60017 typ srflx raddr 192.168.34.75 rport 60017 generation 0 network-id 3 network-cost 10
-                            // a=candidate:229815620 1 tcp 1518280447 192.168.150.19 60017 typ host tcptype active generation 0 network-id 3 network-cost 10
-                            // a=candidate:3289912957 2 tcp 1845501695 193.84.77.194 60017 typ srflx raddr 192.168.34.75 rport 60017 tcptype passive generation 0 network-id 3 network-cost 10
-                            push: 'candidates',
-                            reg: /^candidate:(\S*) (\d*) (\S*) (\d*) (\S*) (\d*) typ (\S*)(?: raddr (\S*) rport (\d*))?(?: tcptype (\S*))?(?: generation (\d*))?(?: network-id (\d*))?(?: network-cost (\d*))?/,
-                            names: [
-                                'foundation',
-                                'component',
-                                'transport',
-                                'priority',
-                                'ip',
-                                'port',
-                                'type',
-                                'raddr',
-                                'rport',
-                                'tcptype',
-                                'generation',
-                                'network-id',
-                                'network-cost',
-                            ],
-                            format: function (o) {
-                                var str = 'candidate:%s %d %s %d %s %d typ %s';
-
-                                str += o.raddr != null ? ' raddr %s rport %d' : '%v%v';
-
-                                // NB: candidate has three optional chunks, so %void middles one if it's missing
-                                str += o.tcptype != null ? ' tcptype %s' : '%v';
-
-                                if (o.generation != null) {
-                                    str += ' generation %d';
-                                }
-
-                                str += o['network-id'] != null ? ' network-id %d' : '%v';
-                                str += o['network-cost'] != null ? ' network-cost %d' : '%v';
-                                return str;
-                            },
-                        },
-                        {
-                            // a=end-of-candidates (keep after the candidates line for readability)
-                            name: 'endOfCandidates',
-                            reg: /^(end-of-candidates)/,
-                        },
-                        {
-                            // a=remote-candidates:1 203.0.113.1 54400 2 203.0.113.1 54401 ...
-                            name: 'remoteCandidates',
-                            reg: /^remote-candidates:(.*)/,
-                            format: 'remote-candidates:%s',
-                        },
-                        {
-                            // a=ice-options:google-ice
-                            name: 'iceOptions',
-                            reg: /^ice-options:(\S*)/,
-                            format: 'ice-options:%s',
-                        },
-                        {
-                            // a=ssrc:2566107569 cname:t9YU8M1UxTF8Y1A1
-                            push: 'ssrcs',
-                            reg: /^ssrc:(\d*) ([\w_-]*)(?::(.*))?/,
-                            names: ['id', 'attribute', 'value'],
-                            format: function (o) {
-                                var str = 'ssrc:%d';
-                                if (o.attribute != null) {
-                                    str += ' %s';
-                                    if (o.value != null) {
-                                        str += ':%s';
-                                    }
-                                }
-                                return str;
-                            },
-                        },
-                        {
-                            // a=ssrc-group:FEC 1 2
-                            // a=ssrc-group:FEC-FR 3004364195 1080772241
-                            push: 'ssrcGroups',
-                            // token-char = %x21 / %x23-27 / %x2A-2B / %x2D-2E / %x30-39 / %x41-5A / %x5E-7E
-                            reg: /^ssrc-group:([\x21\x23\x24\x25\x26\x27\x2A\x2B\x2D\x2E\w]*) (.*)/,
-                            names: ['semantics', 'ssrcs'],
-                            format: 'ssrc-group:%s %s',
-                        },
-                        {
-                            // a=msid-semantic: WMS Jvlam5X3SX1OP6pn20zWogvaKJz5Hjf9OnlV
-                            name: 'msidSemantic',
-                            reg: /^msid-semantic:\s?(\w*) (\S*)/,
-                            names: ['semantic', 'token'],
-                            format: 'msid-semantic: %s %s', // space after ':' is not accidental
-                        },
-                        {
-                            // a=group:BUNDLE audio video
-                            push: 'groups',
-                            reg: /^group:(\w*) (.*)/,
-                            names: ['type', 'mids'],
-                            format: 'group:%s %s',
-                        },
-                        {
-                            // a=rtcp-mux
-                            name: 'rtcpMux',
-                            reg: /^(rtcp-mux)/,
-                        },
-                        {
-                            // a=rtcp-rsize
-                            name: 'rtcpRsize',
-                            reg: /^(rtcp-rsize)/,
-                        },
-                        {
-                            // a=sctpmap:5000 webrtc-datachannel 1024
-                            name: 'sctpmap',
-                            reg: /^sctpmap:([\w_/]*) (\S*)(?: (\S*))?/,
-                            names: ['sctpmapNumber', 'app', 'maxMessageSize'],
-                            format: function (o) {
-                                return o.maxMessageSize != null ? 'sctpmap:%s %s %s' : 'sctpmap:%s %s';
-                            },
-                        },
-                        {
-                            // a=x-google-flag:conference
-                            name: 'xGoogleFlag',
-                            reg: /^x-google-flag:([^\s]*)/,
-                            format: 'x-google-flag:%s',
-                        },
-                        {
-                            // a=rid:1 send max-width=1280;max-height=720;max-fps=30;depend=0
-                            push: 'rids',
-                            reg: /^rid:([\d\w]+) (\w+)(?: ([\S| ]*))?/,
-                            names: ['id', 'direction', 'params'],
-                            format: function (o) {
-                                return o.params ? 'rid:%s %s %s' : 'rid:%s %s';
-                            },
-                        },
-                        {
-                            // a=imageattr:97 send [x=800,y=640,sar=1.1,q=0.6] [x=480,y=320] recv [x=330,y=250]
-                            // a=imageattr:* send [x=800,y=640] recv *
-                            // a=imageattr:100 recv [x=320,y=240]
-                            push: 'imageattrs',
-                            reg: new RegExp(
-                                // a=imageattr:97
-                                '^imageattr:(\\d+|\\*)' +
-                                    // send [x=800,y=640,sar=1.1,q=0.6] [x=480,y=320]
-                                    '[\\s\\t]+(send|recv)[\\s\\t]+(\\*|\\[\\S+\\](?:[\\s\\t]+\\[\\S+\\])*)' +
-                                    // recv [x=330,y=250]
-                                    '(?:[\\s\\t]+(recv|send)[\\s\\t]+(\\*|\\[\\S+\\](?:[\\s\\t]+\\[\\S+\\])*))?',
-                            ),
-                            names: ['pt', 'dir1', 'attrs1', 'dir2', 'attrs2'],
-                            format: function (o) {
-                                return 'imageattr:%s %s %s' + (o.dir2 ? ' %s %s' : '');
-                            },
-                        },
-                        {
-                            // a=simulcast:send 1,2,3;~4,~5 recv 6;~7,~8
-                            // a=simulcast:recv 1;4,5 send 6;7
-                            name: 'simulcast',
-                            reg: new RegExp(
-                                // a=simulcast:
-                                '^simulcast:' +
-                                    // send 1,2,3;~4,~5
-                                    '(send|recv) ([a-zA-Z0-9\\-_~;,]+)' +
-                                    // space + recv 6;~7,~8
-                                    '(?:\\s?(send|recv) ([a-zA-Z0-9\\-_~;,]+))?' +
-                                    // end
-                                    '$',
-                            ),
-                            names: ['dir1', 'list1', 'dir2', 'list2'],
-                            format: function (o) {
-                                return 'simulcast:%s %s' + (o.dir2 ? ' %s %s' : '');
-                            },
-                        },
-                        {
-                            // old simulcast draft 03 (implemented by Firefox)
-                            //   https://tools.ietf.org/html/draft-ietf-mmusic-sdp-simulcast-03
-                            // a=simulcast: recv pt=97;98 send pt=97
-                            // a=simulcast: send rid=5;6;7 paused=6,7
-                            name: 'simulcast_03',
-                            reg: /^simulcast:[\s\t]+([\S+\s\t]+)$/,
-                            names: ['value'],
-                            format: 'simulcast: %s',
-                        },
-                        {
-                            // a=framerate:25
-                            // a=framerate:29.97
-                            name: 'framerate',
-                            reg: /^framerate:(\d+(?:$|\.\d+))/,
-                            format: 'framerate:%s',
-                        },
-                        {
-                            // RFC4570
-                            // a=source-filter: incl IN IP4 239.5.2.31 10.1.15.5
-                            name: 'sourceFilter',
-                            reg: /^source-filter: *(excl|incl) (\S*) (IP4|IP6|\*) (\S*) (.*)/,
-                            names: ['filterMode', 'netType', 'addressTypes', 'destAddress', 'srcList'],
-                            format: 'source-filter: %s %s %s %s %s',
-                        },
-                        {
-                            // a=bundle-only
-                            name: 'bundleOnly',
-                            reg: /^(bundle-only)/,
-                        },
-                        {
-                            // a=label:1
-                            name: 'label',
-                            reg: /^label:(.+)/,
-                            format: 'label:%s',
-                        },
-                        {
-                            // RFC version 26 for SCTP over DTLS
-                            // https://tools.ietf.org/html/draft-ietf-mmusic-sctp-sdp-26#section-5
-                            name: 'sctpPort',
-                            reg: /^sctp-port:(\d+)$/,
-                            format: 'sctp-port:%s',
-                        },
-                        {
-                            // RFC version 26 for SCTP over DTLS
-                            // https://tools.ietf.org/html/draft-ietf-mmusic-sctp-sdp-26#section-6
-                            name: 'maxMessageSize',
-                            reg: /^max-message-size:(\d+)$/,
-                            format: 'max-message-size:%s',
-                        },
-                        {
-                            // RFC7273
-                            // a=ts-refclk:ptp=IEEE1588-2008:39-A7-94-FF-FE-07-CB-D0:37
-                            push: 'tsRefClocks',
-                            reg: /^ts-refclk:([^\s=]*)(?:=(\S*))?/,
-                            names: ['clksrc', 'clksrcExt'],
-                            format: function (o) {
-                                return 'ts-refclk:%s' + (o.clksrcExt != null ? '=%s' : '');
-                            },
-                        },
-                        {
-                            // RFC7273
-                            // a=mediaclk:direct=963214424
-                            name: 'mediaClk',
-                            reg: /^mediaclk:(?:id=(\S*))? *([^\s=]*)(?:=(\S*))?(?: *rate=(\d+)\/(\d+))?/,
-                            names: ['id', 'mediaClockName', 'mediaClockValue', 'rateNumerator', 'rateDenominator'],
-                            format: function (o) {
-                                var str = 'mediaclk:';
-                                str += o.id != null ? 'id=%s %s' : '%v%s';
-                                str += o.mediaClockValue != null ? '=%s' : '';
-                                str += o.rateNumerator != null ? ' rate=%s' : '';
-                                str += o.rateDenominator != null ? '/%s' : '';
-                                return str;
-                            },
-                        },
-                        {
-                            // a=keywds:keywords
-                            name: 'keywords',
-                            reg: /^keywds:(.+)$/,
-                            format: 'keywds:%s',
-                        },
-                        {
-                            // a=content:main
-                            name: 'content',
-                            reg: /^content:(.+)/,
-                            format: 'content:%s',
-                        },
-                        // BFCP https://tools.ietf.org/html/rfc4583
-                        {
-                            // a=floorctrl:c-s
-                            name: 'bfcpFloorCtrl',
-                            reg: /^floorctrl:(c-only|s-only|c-s)/,
-                            format: 'floorctrl:%s',
-                        },
-                        {
-                            // a=confid:1
-                            name: 'bfcpConfId',
-                            reg: /^confid:(\d+)/,
-                            format: 'confid:%s',
-                        },
-                        {
-                            // a=userid:1
-                            name: 'bfcpUserId',
-                            reg: /^userid:(\d+)/,
-                            format: 'userid:%s',
-                        },
-                        {
-                            // a=floorid:1
-                            name: 'bfcpFloorId',
-                            reg: /^floorid:(.+) (?:m-stream|mstrm):(.+)/,
-                            names: ['id', 'mStream'],
-                            format: 'floorid:%s mstrm:%s',
-                        },
-                        {
-                            // any a= that we don't understand is kept verbatim on media.invalid
-                            push: 'invalid',
-                            names: ['value'],
-                        },
-                    ],
-                });
-
-                // set sensible defaults to avoid polluting the grammar with boring details
-                Object.keys(grammar).forEach(function (key) {
-                    var objs = grammar[key];
-                    objs.forEach(function (obj) {
-                        if (!obj.reg) {
-                            obj.reg = /(.*)/;
-                        }
-                        if (!obj.format) {
-                            obj.format = '%s';
-                        }
-                    });
-                });
-            },
-            {},
-        ],
-        41: [
-            function (require, module, exports) {
-                var parser = require('./parser');
-                var writer = require('./writer');
-
-                exports.write = writer;
-                exports.parse = parser.parse;
-                exports.parseParams = parser.parseParams;
-                exports.parseFmtpConfig = parser.parseFmtpConfig; // Alias of parseParams().
-                exports.parsePayloads = parser.parsePayloads;
-                exports.parseRemoteCandidates = parser.parseRemoteCandidates;
-                exports.parseImageAttributes = parser.parseImageAttributes;
-                exports.parseSimulcastStreamList = parser.parseSimulcastStreamList;
-            },
-            { './parser': 42, './writer': 43 },
-        ],
-        42: [
-            function (require, module, exports) {
-                var toIntIfInt = function (v) {
-                    return String(Number(v)) === v ? Number(v) : v;
-                };
-
-                var attachProperties = function (match, location, names, rawName) {
-                    if (rawName && !names) {
-                        location[rawName] = toIntIfInt(match[1]);
-                    } else {
-                        for (var i = 0; i < names.length; i += 1) {
-                            if (match[i + 1] != null) {
-                                location[names[i]] = toIntIfInt(match[i + 1]);
-                            }
+                        for (const key of Object.keys(codecParameters)) {
+                            if (fmtp.config)
+                                fmtp.config += ';';
+                            fmtp.config += `${key}=${codecParameters[key]}`;
+                        }
+                        if (fmtp.config)
+                            this._mediaObject.fmtp.push(fmtp);
+                        for (const fb of codec.rtcpFeedback) {
+                            this._mediaObject.rtcpFb.push({
+                                payload: codec.payloadType,
+                                type: fb.type,
+                                subtype: fb.parameter
+                            });
                         }
                     }
-                };
-
-                var parseReg = function (obj, location, content) {
-                    var needsBlank = obj.name && obj.names;
-                    if (obj.push && !location[obj.push]) {
-                        location[obj.push] = [];
-                    } else if (needsBlank && !location[obj.name]) {
-                        location[obj.name] = {};
-                    }
-                    var keyLocation = obj.push
-                        ? {} // blank object that will be pushed
-                        : needsBlank
-                        ? location[obj.name]
-                        : location; // otherwise, named location or root
-
-                    attachProperties(content.match(obj.reg), keyLocation, obj.names, obj.name);
-
-                    if (obj.push) {
-                        location[obj.push].push(keyLocation);
-                    }
-                };
-
-                var grammar = require('./grammar');
-                var validLine = RegExp.prototype.test.bind(/^([a-z])=(.*)/);
-
-                exports.parse = function (sdp) {
-                    var session = {},
-                        media = [],
-                        location = session; // points at where properties go under (one of the above)
-
-                    // parse lines we understand
-                    sdp.split(/(\r\n|\r|\n)/)
-                        .filter(validLine)
-                        .forEach(function (l) {
-                            var type = l[0];
-                            var content = l.slice(2);
-                            if (type === 'm') {
-                                media.push({ rtp: [], fmtp: [] });
-                                location = media[media.length - 1]; // point at latest media line
-                            }
-
-                            for (var j = 0; j < (grammar[type] || []).length; j += 1) {
-                                var obj = grammar[type][j];
-                                if (obj.reg.test(content)) {
-                                    return parseReg(obj, location, content);
-                                }
-                            }
+                    this._mediaObject.payloads = answerRtpParameters.codecs
+                        .map((codec) => codec.payloadType)
+                        .join(' ');
+                    this._mediaObject.ext = [];
+                    for (const ext of answerRtpParameters.headerExtensions) {
+                        // Don't add a header extension if not present in the offer.
+                        const found = (offerMediaObject.ext || [])
+                            .some((localExt) => localExt.uri === ext.uri);
+                        if (!found)
+                            continue;
+                        this._mediaObject.ext.push({
+                            uri: ext.uri,
+                            value: ext.id
                         });
-
-                    session.media = media; // link it up
-                    return session;
-                };
-
-                var paramReducer = function (acc, expr) {
-                    var s = expr.split(/=(.+)/, 2);
-                    if (s.length === 2) {
-                        acc[s[0]] = toIntIfInt(s[1]);
-                    } else if (s.length === 1 && expr.length > 1) {
-                        acc[s[0]] = undefined;
                     }
-                    return acc;
-                };
-
-                exports.parseParams = function (str) {
-                    return str.split(/;\s?/).reduce(paramReducer, {});
-                };
-
-                // For backward compatibility - alias will be removed in 3.0.0
-                exports.parseFmtpConfig = exports.parseParams;
-
-                exports.parsePayloads = function (str) {
-                    return str.toString().split(' ').map(Number);
-                };
-
-                exports.parseRemoteCandidates = function (str) {
-                    var candidates = [];
-                    var parts = str.split(' ').map(toIntIfInt);
-                    for (var i = 0; i < parts.length; i += 3) {
-                        candidates.push({
-                            component: parts[i],
-                            ip: parts[i + 1],
-                            port: parts[i + 2],
-                        });
+                    // Allow both 1 byte and 2 bytes length header extensions.
+                    if (extmapAllowMixed &&
+                        offerMediaObject.extmapAllowMixed === 'extmap-allow-mixed') {
+                        this._mediaObject.extmapAllowMixed = 'extmap-allow-mixed';
                     }
-                    return candidates;
-                };
-
-                exports.parseImageAttributes = function (str) {
-                    return str.split(' ').map(function (item) {
-                        return item
-                            .substring(1, item.length - 1)
-                            .split(',')
-                            .reduce(paramReducer, {});
-                    });
-                };
-
-                exports.parseSimulcastStreamList = function (str) {
-                    return str.split(';').map(function (stream) {
-                        return stream.split(',').map(function (format) {
-                            var scid,
-                                paused = false;
-
-                            if (format[0] !== '~') {
-                                scid = toIntIfInt(format);
-                            } else {
-                                scid = toIntIfInt(format.substring(1, format.length));
-                                paused = true;
-                            }
-
-                            return {
-                                scid: scid,
-                                paused: paused,
+                    // Simulcast.
+                    if (offerMediaObject.simulcast) {
+                        this._mediaObject.simulcast =
+                            {
+                                dir1: 'recv',
+                                list1: offerMediaObject.simulcast.list1
                             };
-                        });
-                    });
-                };
-            },
-            { './grammar': 40 },
-        ],
-        43: [
-            function (require, module, exports) {
-                var grammar = require('./grammar');
-
-                // customized util.format - discards excess arguments and can void middle ones
-                var formatRegExp = /%[sdv%]/g;
-                var format = function (formatStr) {
-                    var i = 1;
-                    var args = arguments;
-                    var len = args.length;
-                    return formatStr.replace(formatRegExp, function (x) {
-                        if (i >= len) {
-                            return x; // missing argument
+                        this._mediaObject.rids = [];
+                        for (const rid of offerMediaObject.rids || []) {
+                            if (rid.direction !== 'send')
+                                continue;
+                            this._mediaObject.rids.push({
+                                id: rid.id,
+                                direction: 'recv'
+                            });
                         }
-                        var arg = args[i];
-                        i += 1;
-                        switch (x) {
-                            case '%%':
-                                return '%';
-                            case '%s':
-                                return String(arg);
-                            case '%d':
-                                return Number(arg);
-                            case '%v':
-                                return '';
+                    }
+                    // Simulcast (draft version 03).
+                    else if (offerMediaObject.simulcast_03) {
+                        // eslint-disable-next-line camelcase
+                        this._mediaObject.simulcast_03 =
+                            {
+                                value: offerMediaObject.simulcast_03.value.replace(/send/g, 'recv')
+                            };
+                        this._mediaObject.rids = [];
+                        for (const rid of offerMediaObject.rids || []) {
+                            if (rid.direction !== 'send')
+                                continue;
+                            this._mediaObject.rids.push({
+                                id: rid.id,
+                                direction: 'recv'
+                            });
                         }
-                    });
-                    // NB: we discard excess arguments - they are typically undefined from makeLine
+                    }
+                    this._mediaObject.rtcpMux = 'rtcp-mux';
+                    this._mediaObject.rtcpRsize = 'rtcp-rsize';
+                    if (this._planB && this._mediaObject.type === 'video')
+                        this._mediaObject.xGoogleFlag = 'conference';
+                    break;
+                }
+            case 'application':
+                {
+                    // New spec.
+                    if (typeof offerMediaObject.sctpPort === 'number') {
+                        this._mediaObject.payloads = 'webrtc-datachannel';
+                        this._mediaObject.sctpPort = sctpParameters.port;
+                        this._mediaObject.maxMessageSize = sctpParameters.maxMessageSize;
+                    }
+                    // Old spec.
+                    else if (offerMediaObject.sctpmap) {
+                        this._mediaObject.payloads = sctpParameters.port;
+                        this._mediaObject.sctpmap =
+                            {
+                                app: 'webrtc-datachannel',
+                                sctpmapNumber: sctpParameters.port,
+                                maxMessageSize: sctpParameters.maxMessageSize
+                            };
+                    }
+                    break;
+                }
+        }
+    }
+    setDtlsRole(role) {
+        switch (role) {
+            case 'client':
+                this._mediaObject.setup = 'active';
+                break;
+            case 'server':
+                this._mediaObject.setup = 'passive';
+                break;
+            case 'auto':
+                this._mediaObject.setup = 'actpass';
+                break;
+        }
+    }
+}
+exports.AnswerMediaSection = AnswerMediaSection;
+class OfferMediaSection extends MediaSection {
+    constructor({ iceParameters, iceCandidates, dtlsParameters, sctpParameters, plainRtpParameters, planB = false, mid, kind, offerRtpParameters, streamId, trackId, oldDataChannelSpec = false }) {
+        super({ iceParameters, iceCandidates, dtlsParameters, planB });
+        this._mediaObject.mid = String(mid);
+        this._mediaObject.type = kind;
+        if (!plainRtpParameters) {
+            this._mediaObject.connection = { ip: '127.0.0.1', version: 4 };
+            if (!sctpParameters)
+                this._mediaObject.protocol = 'UDP/TLS/RTP/SAVPF';
+            else
+                this._mediaObject.protocol = 'UDP/DTLS/SCTP';
+            this._mediaObject.port = 7;
+        }
+        else {
+            this._mediaObject.connection =
+                {
+                    ip: plainRtpParameters.ip,
+                    version: plainRtpParameters.ipVersion
                 };
-
-                var makeLine = function (type, obj, location) {
-                    var str =
-                        obj.format instanceof Function
-                            ? obj.format(obj.push ? location : location[obj.name])
-                            : obj.format;
-
-                    var args = [type + '=' + str];
-                    if (obj.names) {
-                        for (var i = 0; i < obj.names.length; i += 1) {
-                            var n = obj.names[i];
-                            if (obj.name) {
-                                args.push(location[obj.name][n]);
-                            } else {
-                                // for mLine and push attributes
-                                args.push(location[obj.names[i]]);
-                            }
+            this._mediaObject.protocol = 'RTP/AVP';
+            this._mediaObject.port = plainRtpParameters.port;
+        }
+        switch (kind) {
+            case 'audio':
+            case 'video':
+                {
+                    this._mediaObject.direction = 'sendonly';
+                    this._mediaObject.rtp = [];
+                    this._mediaObject.rtcpFb = [];
+                    this._mediaObject.fmtp = [];
+                    if (!this._planB)
+                        this._mediaObject.msid = `${streamId || '-'} ${trackId}`;
+                    for (const codec of offerRtpParameters.codecs) {
+                        const rtp = {
+                            payload: codec.payloadType,
+                            codec: getCodecName(codec),
+                            rate: codec.clockRate
+                        };
+                        if (codec.channels > 1)
+                            rtp.encoding = codec.channels;
+                        this._mediaObject.rtp.push(rtp);
+                        const fmtp = {
+                            payload: codec.payloadType,
+                            config: ''
+                        };
+                        for (const key of Object.keys(codec.parameters)) {
+                            if (fmtp.config)
+                                fmtp.config += ';';
+                            fmtp.config += `${key}=${codec.parameters[key]}`;
+                        }
+                        if (fmtp.config)
+                            this._mediaObject.fmtp.push(fmtp);
+                        for (const fb of codec.rtcpFeedback) {
+                            this._mediaObject.rtcpFb.push({
+                                payload: codec.payloadType,
+                                type: fb.type,
+                                subtype: fb.parameter
+                            });
                         }
-                    } else {
-                        args.push(location[obj.name]);
                     }
-                    return format.apply(null, args);
-                };
-
-                // RFC specified order
-                // TODO: extend this with all the rest
-                var defaultOuterOrder = ['v', 'o', 's', 'i', 'u', 'e', 'p', 'c', 'b', 't', 'r', 'z', 'a'];
-                var defaultInnerOrder = ['i', 'c', 'b', 'a'];
-
-                module.exports = function (session, opts) {
-                    opts = opts || {};
-                    // ensure certain properties exist
-                    if (session.version == null) {
-                        session.version = 0; // 'v=0' must be there (only defined version atm)
+                    this._mediaObject.payloads = offerRtpParameters.codecs
+                        .map((codec) => codec.payloadType)
+                        .join(' ');
+                    this._mediaObject.ext = [];
+                    for (const ext of offerRtpParameters.headerExtensions) {
+                        this._mediaObject.ext.push({
+                            uri: ext.uri,
+                            value: ext.id
+                        });
+                    }
+                    this._mediaObject.rtcpMux = 'rtcp-mux';
+                    this._mediaObject.rtcpRsize = 'rtcp-rsize';
+                    const encoding = offerRtpParameters.encodings[0];
+                    const ssrc = encoding.ssrc;
+                    const rtxSsrc = (encoding.rtx && encoding.rtx.ssrc)
+                        ? encoding.rtx.ssrc
+                        : undefined;
+                    this._mediaObject.ssrcs = [];
+                    this._mediaObject.ssrcGroups = [];
+                    if (offerRtpParameters.rtcp.cname) {
+                        this._mediaObject.ssrcs.push({
+                            id: ssrc,
+                            attribute: 'cname',
+                            value: offerRtpParameters.rtcp.cname
+                        });
                     }
-                    if (session.name == null) {
-                        session.name = ' '; // 's= ' must be there if no meaningful name set
+                    if (this._planB) {
+                        this._mediaObject.ssrcs.push({
+                            id: ssrc,
+                            attribute: 'msid',
+                            value: `${streamId || '-'} ${trackId}`
+                        });
                     }
-                    session.media.forEach(function (mLine) {
-                        if (mLine.payloads == null) {
-                            mLine.payloads = '';
+                    if (rtxSsrc) {
+                        if (offerRtpParameters.rtcp.cname) {
+                            this._mediaObject.ssrcs.push({
+                                id: rtxSsrc,
+                                attribute: 'cname',
+                                value: offerRtpParameters.rtcp.cname
+                            });
                         }
-                    });
-
-                    var outerOrder = opts.outerOrder || defaultOuterOrder;
-                    var innerOrder = opts.innerOrder || defaultInnerOrder;
-                    var sdp = [];
-
-                    // loop through outerOrder for matching properties on session
-                    outerOrder.forEach(function (type) {
-                        grammar[type].forEach(function (obj) {
-                            if (obj.name in session && session[obj.name] != null) {
-                                sdp.push(makeLine(type, obj, session));
-                            } else if (obj.push in session && session[obj.push] != null) {
-                                session[obj.push].forEach(function (el) {
-                                    sdp.push(makeLine(type, obj, el));
-                                });
-                            }
-                        });
-                    });
-
-                    // then for each media line, follow the innerOrder
-                    session.media.forEach(function (mLine) {
-                        sdp.push(makeLine('m', grammar.m[0], mLine));
-
-                        innerOrder.forEach(function (type) {
-                            grammar[type].forEach(function (obj) {
-                                if (obj.name in mLine && mLine[obj.name] != null) {
-                                    sdp.push(makeLine(type, obj, mLine));
-                                } else if (obj.push in mLine && mLine[obj.push] != null) {
-                                    mLine[obj.push].forEach(function (el) {
-                                        sdp.push(makeLine(type, obj, el));
-                                    });
-                                }
+                        if (this._planB) {
+                            this._mediaObject.ssrcs.push({
+                                id: rtxSsrc,
+                                attribute: 'msid',
+                                value: `${streamId || '-'} ${trackId}`
                             });
+                        }
+                        // Associate original and retransmission SSRCs.
+                        this._mediaObject.ssrcGroups.push({
+                            semantics: 'FID',
+                            ssrcs: `${ssrc} ${rtxSsrc}`
                         });
-                    });
-
-                    return sdp.join('\r\n') + '\r\n';
-                };
-            },
-            { './grammar': 40 },
-        ],
-        44: [
-            function (require, module, exports) {
-                window.mediasoupClient = require('mediasoup-client');
-            },
-            { 'mediasoup-client': 32 },
-        ],
-        45: [
-            function (require, module, exports) {
-                // Copyright Joyent, Inc. and other Node contributors.
-                //
-                // Permission is hereby granted, free of charge, to any person obtaining a
-                // copy of this software and associated documentation files (the
-                // "Software"), to deal in the Software without restriction, including
-                // without limitation the rights to use, copy, modify, merge, publish,
-                // distribute, sublicense, and/or sell copies of the Software, and to permit
-                // persons to whom the Software is furnished to do so, subject to the
-                // following conditions:
-                //
-                // The above copyright notice and this permission notice shall be included
-                // in all copies or substantial portions of the Software.
-                //
-                // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-                // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-                // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
-                // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
-                // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-                // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
-                // USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-                var objectCreate = Object.create || objectCreatePolyfill;
-                var objectKeys = Object.keys || objectKeysPolyfill;
-                var bind = Function.prototype.bind || functionBindPolyfill;
-
-                function EventEmitter() {
-                    if (!this._events || !Object.prototype.hasOwnProperty.call(this, '_events')) {
-                        this._events = objectCreate(null);
-                        this._eventsCount = 0;
                     }
-
-                    this._maxListeners = this._maxListeners || undefined;
-                }
-                module.exports = EventEmitter;
-
-                // Backwards-compat with node 0.10.x
-                EventEmitter.EventEmitter = EventEmitter;
-
-                EventEmitter.prototype._events = undefined;
-                EventEmitter.prototype._maxListeners = undefined;
-
-                // By default EventEmitters will print a warning if more than 10 listeners are
-                // added to it. This is a useful default which helps finding memory leaks.
-                var defaultMaxListeners = 10;
-
-                var hasDefineProperty;
-                try {
-                    var o = {};
-                    if (Object.defineProperty) Object.defineProperty(o, 'x', { value: 0 });
-                    hasDefineProperty = o.x === 0;
-                } catch (err) {
-                    hasDefineProperty = false;
-                }
-                if (hasDefineProperty) {
-                    Object.defineProperty(EventEmitter, 'defaultMaxListeners', {
-                        enumerable: true,
-                        get: function () {
-                            return defaultMaxListeners;
-                        },
-                        set: function (arg) {
-                            // check whether the input is a positive number (whose value is zero or
-                            // greater and not a NaN).
-                            if (typeof arg !== 'number' || arg < 0 || arg !== arg)
-                                throw new TypeError('"defaultMaxListeners" must be a positive number');
-                            defaultMaxListeners = arg;
-                        },
-                    });
-                } else {
-                    EventEmitter.defaultMaxListeners = defaultMaxListeners;
+                    break;
                 }
-
-                // Obviously not all Emitters should be limited to 10. This function allows
-                // that to be increased. Set to zero for unlimited.
-                EventEmitter.prototype.setMaxListeners = function setMaxListeners(n) {
-                    if (typeof n !== 'number' || n < 0 || isNaN(n))
-                        throw new TypeError('"n" argument must be a positive number');
-                    this._maxListeners = n;
-                    return this;
-                };
-
-                function $getMaxListeners(that) {
-                    if (that._maxListeners === undefined) return EventEmitter.defaultMaxListeners;
-                    return that._maxListeners;
-                }
-
-                EventEmitter.prototype.getMaxListeners = function getMaxListeners() {
-                    return $getMaxListeners(this);
-                };
-
-                // These standalone emit* functions are used to optimize calling of event
-                // handlers for fast cases because emit() itself often has a variable number of
-                // arguments and can be deoptimized because of that. These functions always have
-                // the same number of arguments and thus do not get deoptimized, so the code
-                // inside them can execute faster.
-                function emitNone(handler, isFn, self) {
-                    if (isFn) handler.call(self);
+            case 'application':
+                {
+                    // New spec.
+                    if (!oldDataChannelSpec) {
+                        this._mediaObject.payloads = 'webrtc-datachannel';
+                        this._mediaObject.sctpPort = sctpParameters.port;
+                        this._mediaObject.maxMessageSize = sctpParameters.maxMessageSize;
+                    }
+                    // Old spec.
                     else {
-                        var len = handler.length;
-                        var listeners = arrayClone(handler, len);
-                        for (var i = 0; i < len; ++i) listeners[i].call(self);
+                        this._mediaObject.payloads = sctpParameters.port;
+                        this._mediaObject.sctpmap =
+                            {
+                                app: 'webrtc-datachannel',
+                                sctpmapNumber: sctpParameters.port,
+                                maxMessageSize: sctpParameters.maxMessageSize
+                            };
                     }
+                    break;
                 }
-                function emitOne(handler, isFn, self, arg1) {
-                    if (isFn) handler.call(self, arg1);
-                    else {
-                        var len = handler.length;
-                        var listeners = arrayClone(handler, len);
-                        for (var i = 0; i < len; ++i) listeners[i].call(self, arg1);
-                    }
+        }
+    }
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    setDtlsRole(role) {
+        // Always 'actpass'.
+        this._mediaObject.setup = 'actpass';
+    }
+    planBReceive({ offerRtpParameters, streamId, trackId }) {
+        const encoding = offerRtpParameters.encodings[0];
+        const ssrc = encoding.ssrc;
+        const rtxSsrc = (encoding.rtx && encoding.rtx.ssrc)
+            ? encoding.rtx.ssrc
+            : undefined;
+        const payloads = this._mediaObject.payloads.split(' ');
+        for (const codec of offerRtpParameters.codecs) {
+            if (payloads.includes(String(codec.payloadType))) {
+                continue;
+            }
+            const rtp = {
+                payload: codec.payloadType,
+                codec: getCodecName(codec),
+                rate: codec.clockRate
+            };
+            if (codec.channels > 1)
+                rtp.encoding = codec.channels;
+            this._mediaObject.rtp.push(rtp);
+            const fmtp = {
+                payload: codec.payloadType,
+                config: ''
+            };
+            for (const key of Object.keys(codec.parameters)) {
+                if (fmtp.config)
+                    fmtp.config += ';';
+                fmtp.config += `${key}=${codec.parameters[key]}`;
+            }
+            if (fmtp.config)
+                this._mediaObject.fmtp.push(fmtp);
+            for (const fb of codec.rtcpFeedback) {
+                this._mediaObject.rtcpFb.push({
+                    payload: codec.payloadType,
+                    type: fb.type,
+                    subtype: fb.parameter
+                });
+            }
+        }
+        this._mediaObject.payloads += ` ${offerRtpParameters
+            .codecs
+            .filter((codec) => !this._mediaObject.payloads.includes(codec.payloadType))
+            .map((codec) => codec.payloadType)
+            .join(' ')}`;
+        this._mediaObject.payloads = this._mediaObject.payloads.trim();
+        if (offerRtpParameters.rtcp.cname) {
+            this._mediaObject.ssrcs.push({
+                id: ssrc,
+                attribute: 'cname',
+                value: offerRtpParameters.rtcp.cname
+            });
+        }
+        this._mediaObject.ssrcs.push({
+            id: ssrc,
+            attribute: 'msid',
+            value: `${streamId || '-'} ${trackId}`
+        });
+        if (rtxSsrc) {
+            if (offerRtpParameters.rtcp.cname) {
+                this._mediaObject.ssrcs.push({
+                    id: rtxSsrc,
+                    attribute: 'cname',
+                    value: offerRtpParameters.rtcp.cname
+                });
+            }
+            this._mediaObject.ssrcs.push({
+                id: rtxSsrc,
+                attribute: 'msid',
+                value: `${streamId || '-'} ${trackId}`
+            });
+            // Associate original and retransmission SSRCs.
+            this._mediaObject.ssrcGroups.push({
+                semantics: 'FID',
+                ssrcs: `${ssrc} ${rtxSsrc}`
+            });
+        }
+    }
+    planBStopReceiving({ offerRtpParameters }) {
+        const encoding = offerRtpParameters.encodings[0];
+        const ssrc = encoding.ssrc;
+        const rtxSsrc = (encoding.rtx && encoding.rtx.ssrc)
+            ? encoding.rtx.ssrc
+            : undefined;
+        this._mediaObject.ssrcs = this._mediaObject.ssrcs
+            .filter((s) => s.id !== ssrc && s.id !== rtxSsrc);
+        if (rtxSsrc) {
+            this._mediaObject.ssrcGroups = this._mediaObject.ssrcGroups
+                .filter((group) => group.ssrcs !== `${ssrc} ${rtxSsrc}`);
+        }
+    }
+}
+exports.OfferMediaSection = OfferMediaSection;
+function getCodecName(codec) {
+    const MimeTypeRegex = new RegExp('^(audio|video)/(.+)', 'i');
+    const mimeTypeMatch = MimeTypeRegex.exec(codec.mimeType);
+    if (!mimeTypeMatch)
+        throw new TypeError('invalid codec.mimeType');
+    return mimeTypeMatch[2];
+}
+
+},{"../../utils":39}],31:[function(require,module,exports){
+"use strict";
+var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
+}) : (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    o[k2] = m[k];
+}));
+var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
+    Object.defineProperty(o, "default", { enumerable: true, value: v });
+}) : function(o, v) {
+    o["default"] = v;
+});
+var __importStar = (this && this.__importStar) || function (mod) {
+    if (mod && mod.__esModule) return mod;
+    var result = {};
+    if (mod != null) for (var k in mod) if (k !== "default" && Object.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
+    __setModuleDefault(result, mod);
+    return result;
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.RemoteSdp = void 0;
+const sdpTransform = __importStar(require("sdp-transform"));
+const Logger_1 = require("../../Logger");
+const MediaSection_1 = require("./MediaSection");
+const logger = new Logger_1.Logger('RemoteSdp');
+class RemoteSdp {
+    constructor({ iceParameters, iceCandidates, dtlsParameters, sctpParameters, plainRtpParameters, planB = false }) {
+        // MediaSection instances with same order as in the SDP.
+        this._mediaSections = [];
+        // MediaSection indices indexed by MID.
+        this._midToIndex = new Map();
+        this._iceParameters = iceParameters;
+        this._iceCandidates = iceCandidates;
+        this._dtlsParameters = dtlsParameters;
+        this._sctpParameters = sctpParameters;
+        this._plainRtpParameters = plainRtpParameters;
+        this._planB = planB;
+        this._sdpObject =
+            {
+                version: 0,
+                origin: {
+                    address: '0.0.0.0',
+                    ipVer: 4,
+                    netType: 'IN',
+                    sessionId: 10000,
+                    sessionVersion: 0,
+                    username: 'mediasoup-client'
+                },
+                name: '-',
+                timing: { start: 0, stop: 0 },
+                media: []
+            };
+        // If ICE parameters are given, add ICE-Lite indicator.
+        if (iceParameters && iceParameters.iceLite) {
+            this._sdpObject.icelite = 'ice-lite';
+        }
+        // If DTLS parameters are given, assume WebRTC and BUNDLE.
+        if (dtlsParameters) {
+            this._sdpObject.msidSemantic = { semantic: 'WMS', token: '*' };
+            // NOTE: We take the latest fingerprint.
+            const numFingerprints = this._dtlsParameters.fingerprints.length;
+            this._sdpObject.fingerprint =
+                {
+                    type: dtlsParameters.fingerprints[numFingerprints - 1].algorithm,
+                    hash: dtlsParameters.fingerprints[numFingerprints - 1].value
+                };
+            this._sdpObject.groups = [{ type: 'BUNDLE', mids: '' }];
+        }
+        // If there are plain RPT parameters, override SDP origin.
+        if (plainRtpParameters) {
+            this._sdpObject.origin.address = plainRtpParameters.ip;
+            this._sdpObject.origin.ipVer = plainRtpParameters.ipVersion;
+        }
+    }
+    updateIceParameters(iceParameters) {
+        logger.debug('updateIceParameters() [iceParameters:%o]', iceParameters);
+        this._iceParameters = iceParameters;
+        this._sdpObject.icelite = iceParameters.iceLite ? 'ice-lite' : undefined;
+        for (const mediaSection of this._mediaSections) {
+            mediaSection.setIceParameters(iceParameters);
+        }
+    }
+    updateDtlsRole(role) {
+        logger.debug('updateDtlsRole() [role:%s]', role);
+        this._dtlsParameters.role = role;
+        for (const mediaSection of this._mediaSections) {
+            mediaSection.setDtlsRole(role);
+        }
+    }
+    getNextMediaSectionIdx() {
+        // If a closed media section is found, return its index.
+        for (let idx = 0; idx < this._mediaSections.length; ++idx) {
+            const mediaSection = this._mediaSections[idx];
+            if (mediaSection.closed)
+                return { idx, reuseMid: mediaSection.mid };
+        }
+        // If no closed media section is found, return next one.
+        return { idx: this._mediaSections.length };
+    }
+    send({ offerMediaObject, reuseMid, offerRtpParameters, answerRtpParameters, codecOptions, extmapAllowMixed = false }) {
+        const mediaSection = new MediaSection_1.AnswerMediaSection({
+            iceParameters: this._iceParameters,
+            iceCandidates: this._iceCandidates,
+            dtlsParameters: this._dtlsParameters,
+            plainRtpParameters: this._plainRtpParameters,
+            planB: this._planB,
+            offerMediaObject,
+            offerRtpParameters,
+            answerRtpParameters,
+            codecOptions,
+            extmapAllowMixed
+        });
+        // Unified-Plan with closed media section replacement.
+        if (reuseMid) {
+            this._replaceMediaSection(mediaSection, reuseMid);
+        }
+        // Unified-Plan or Plan-B with different media kind.
+        else if (!this._midToIndex.has(mediaSection.mid)) {
+            this._addMediaSection(mediaSection);
+        }
+        // Plan-B with same media kind.
+        else {
+            this._replaceMediaSection(mediaSection);
+        }
+    }
+    receive({ mid, kind, offerRtpParameters, streamId, trackId }) {
+        const idx = this._midToIndex.get(mid);
+        let mediaSection;
+        if (idx !== undefined)
+            mediaSection = this._mediaSections[idx];
+        // Unified-Plan or different media kind.
+        if (!mediaSection) {
+            mediaSection = new MediaSection_1.OfferMediaSection({
+                iceParameters: this._iceParameters,
+                iceCandidates: this._iceCandidates,
+                dtlsParameters: this._dtlsParameters,
+                plainRtpParameters: this._plainRtpParameters,
+                planB: this._planB,
+                mid,
+                kind,
+                offerRtpParameters,
+                streamId,
+                trackId
+            });
+            // Let's try to recycle a closed media section (if any).
+            // NOTE: Yes, we can recycle a closed m=audio section with a new m=video.
+            const oldMediaSection = this._mediaSections.find((m) => (m.closed));
+            if (oldMediaSection) {
+                this._replaceMediaSection(mediaSection, oldMediaSection.mid);
+            }
+            else {
+                this._addMediaSection(mediaSection);
+            }
+        }
+        // Plan-B.
+        else {
+            mediaSection.planBReceive({ offerRtpParameters, streamId, trackId });
+            this._replaceMediaSection(mediaSection);
+        }
+    }
+    disableMediaSection(mid) {
+        const idx = this._midToIndex.get(mid);
+        if (idx === undefined) {
+            throw new Error(`no media section found with mid '${mid}'`);
+        }
+        const mediaSection = this._mediaSections[idx];
+        mediaSection.disable();
+    }
+    closeMediaSection(mid) {
+        const idx = this._midToIndex.get(mid);
+        if (idx === undefined) {
+            throw new Error(`no media section found with mid '${mid}'`);
+        }
+        const mediaSection = this._mediaSections[idx];
+        // NOTE: Closing the first m section is a pain since it invalidates the
+        // bundled transport, so let's avoid it.
+        if (mid === this._firstMid) {
+            logger.debug('closeMediaSection() | cannot close first media section, disabling it instead [mid:%s]', mid);
+            this.disableMediaSection(mid);
+            return;
+        }
+        mediaSection.close();
+        // Regenerate BUNDLE mids.
+        this._regenerateBundleMids();
+    }
+    planBStopReceiving({ mid, offerRtpParameters }) {
+        const idx = this._midToIndex.get(mid);
+        if (idx === undefined) {
+            throw new Error(`no media section found with mid '${mid}'`);
+        }
+        const mediaSection = this._mediaSections[idx];
+        mediaSection.planBStopReceiving({ offerRtpParameters });
+        this._replaceMediaSection(mediaSection);
+    }
+    sendSctpAssociation({ offerMediaObject }) {
+        const mediaSection = new MediaSection_1.AnswerMediaSection({
+            iceParameters: this._iceParameters,
+            iceCandidates: this._iceCandidates,
+            dtlsParameters: this._dtlsParameters,
+            sctpParameters: this._sctpParameters,
+            plainRtpParameters: this._plainRtpParameters,
+            offerMediaObject
+        });
+        this._addMediaSection(mediaSection);
+    }
+    receiveSctpAssociation({ oldDataChannelSpec = false } = {}) {
+        const mediaSection = new MediaSection_1.OfferMediaSection({
+            iceParameters: this._iceParameters,
+            iceCandidates: this._iceCandidates,
+            dtlsParameters: this._dtlsParameters,
+            sctpParameters: this._sctpParameters,
+            plainRtpParameters: this._plainRtpParameters,
+            mid: 'datachannel',
+            kind: 'application',
+            oldDataChannelSpec
+        });
+        this._addMediaSection(mediaSection);
+    }
+    getSdp() {
+        // Increase SDP version.
+        this._sdpObject.origin.sessionVersion++;
+        return sdpTransform.write(this._sdpObject);
+    }
+    _addMediaSection(newMediaSection) {
+        if (!this._firstMid)
+            this._firstMid = newMediaSection.mid;
+        // Add to the vector.
+        this._mediaSections.push(newMediaSection);
+        // Add to the map.
+        this._midToIndex.set(newMediaSection.mid, this._mediaSections.length - 1);
+        // Add to the SDP object.
+        this._sdpObject.media.push(newMediaSection.getObject());
+        // Regenerate BUNDLE mids.
+        this._regenerateBundleMids();
+    }
+    _replaceMediaSection(newMediaSection, reuseMid) {
+        // Store it in the map.
+        if (typeof reuseMid === 'string') {
+            const idx = this._midToIndex.get(reuseMid);
+            if (idx === undefined) {
+                throw new Error(`no media section found for reuseMid '${reuseMid}'`);
+            }
+            const oldMediaSection = this._mediaSections[idx];
+            // Replace the index in the vector with the new media section.
+            this._mediaSections[idx] = newMediaSection;
+            // Update the map.
+            this._midToIndex.delete(oldMediaSection.mid);
+            this._midToIndex.set(newMediaSection.mid, idx);
+            // Update the SDP object.
+            this._sdpObject.media[idx] = newMediaSection.getObject();
+            // Regenerate BUNDLE mids.
+            this._regenerateBundleMids();
+        }
+        else {
+            const idx = this._midToIndex.get(newMediaSection.mid);
+            if (idx === undefined) {
+                throw new Error(`no media section found with mid '${newMediaSection.mid}'`);
+            }
+            // Replace the index in the vector with the new media section.
+            this._mediaSections[idx] = newMediaSection;
+            // Update the SDP object.
+            this._sdpObject.media[idx] = newMediaSection.getObject();
+        }
+    }
+    _regenerateBundleMids() {
+        if (!this._dtlsParameters)
+            return;
+        this._sdpObject.groups[0].mids = this._mediaSections
+            .filter((mediaSection) => !mediaSection.closed)
+            .map((mediaSection) => mediaSection.mid)
+            .join(' ');
+    }
+}
+exports.RemoteSdp = RemoteSdp;
+
+},{"../../Logger":13,"./MediaSection":30,"sdp-transform":44}],32:[function(require,module,exports){
+"use strict";
+var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
+}) : (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    o[k2] = m[k];
+}));
+var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
+    Object.defineProperty(o, "default", { enumerable: true, value: v });
+}) : function(o, v) {
+    o["default"] = v;
+});
+var __importStar = (this && this.__importStar) || function (mod) {
+    if (mod && mod.__esModule) return mod;
+    var result = {};
+    if (mod != null) for (var k in mod) if (k !== "default" && Object.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
+    __setModuleDefault(result, mod);
+    return result;
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.applyCodecParameters = exports.getCname = exports.extractDtlsParameters = exports.extractRtpCapabilities = void 0;
+const sdpTransform = __importStar(require("sdp-transform"));
+function extractRtpCapabilities({ sdpObject }) {
+    // Map of RtpCodecParameters indexed by payload type.
+    const codecsMap = new Map();
+    // Array of RtpHeaderExtensions.
+    const headerExtensions = [];
+    // Whether a m=audio/video section has been already found.
+    let gotAudio = false;
+    let gotVideo = false;
+    for (const m of sdpObject.media) {
+        const kind = m.type;
+        switch (kind) {
+            case 'audio':
+                {
+                    if (gotAudio)
+                        continue;
+                    gotAudio = true;
+                    break;
                 }
-                function emitTwo(handler, isFn, self, arg1, arg2) {
-                    if (isFn) handler.call(self, arg1, arg2);
-                    else {
-                        var len = handler.length;
-                        var listeners = arrayClone(handler, len);
-                        for (var i = 0; i < len; ++i) listeners[i].call(self, arg1, arg2);
-                    }
+            case 'video':
+                {
+                    if (gotVideo)
+                        continue;
+                    gotVideo = true;
+                    break;
                 }
-                function emitThree(handler, isFn, self, arg1, arg2, arg3) {
-                    if (isFn) handler.call(self, arg1, arg2, arg3);
-                    else {
-                        var len = handler.length;
-                        var listeners = arrayClone(handler, len);
-                        for (var i = 0; i < len; ++i) listeners[i].call(self, arg1, arg2, arg3);
-                    }
+            default:
+                {
+                    continue;
                 }
-
-                function emitMany(handler, isFn, self, args) {
-                    if (isFn) handler.apply(self, args);
-                    else {
-                        var len = handler.length;
-                        var listeners = arrayClone(handler, len);
-                        for (var i = 0; i < len; ++i) listeners[i].apply(self, args);
-                    }
+        }
+        // Get codecs.
+        for (const rtp of m.rtp) {
+            const codec = {
+                kind: kind,
+                mimeType: `${kind}/${rtp.codec}`,
+                preferredPayloadType: rtp.payload,
+                clockRate: rtp.rate,
+                channels: rtp.encoding,
+                parameters: {},
+                rtcpFeedback: []
+            };
+            codecsMap.set(codec.preferredPayloadType, codec);
+        }
+        // Get codec parameters.
+        for (const fmtp of m.fmtp || []) {
+            const parameters = sdpTransform.parseParams(fmtp.config);
+            const codec = codecsMap.get(fmtp.payload);
+            if (!codec)
+                continue;
+            // Specials case to convert parameter value to string.
+            if (parameters && parameters.hasOwnProperty('profile-level-id'))
+                parameters['profile-level-id'] = String(parameters['profile-level-id']);
+            codec.parameters = parameters;
+        }
+        // Get RTCP feedback for each codec.
+        for (const fb of m.rtcpFb || []) {
+            const codec = codecsMap.get(fb.payload);
+            if (!codec)
+                continue;
+            const feedback = {
+                type: fb.type,
+                parameter: fb.subtype
+            };
+            if (!feedback.parameter)
+                delete feedback.parameter;
+            codec.rtcpFeedback.push(feedback);
+        }
+        // Get RTP header extensions.
+        for (const ext of m.ext || []) {
+            // Ignore encrypted extensions (not yet supported in mediasoup).
+            if (ext['encrypt-uri'])
+                continue;
+            const headerExtension = {
+                kind: kind,
+                uri: ext.uri,
+                preferredId: ext.value
+            };
+            headerExtensions.push(headerExtension);
+        }
+    }
+    const rtpCapabilities = {
+        codecs: Array.from(codecsMap.values()),
+        headerExtensions: headerExtensions
+    };
+    return rtpCapabilities;
+}
+exports.extractRtpCapabilities = extractRtpCapabilities;
+function extractDtlsParameters({ sdpObject }) {
+    const mediaObject = (sdpObject.media || [])
+        .find((m) => (m.iceUfrag && m.port !== 0));
+    if (!mediaObject)
+        throw new Error('no active media section found');
+    const fingerprint = mediaObject.fingerprint || sdpObject.fingerprint;
+    let role;
+    switch (mediaObject.setup) {
+        case 'active':
+            role = 'client';
+            break;
+        case 'passive':
+            role = 'server';
+            break;
+        case 'actpass':
+            role = 'auto';
+            break;
+    }
+    const dtlsParameters = {
+        role,
+        fingerprints: [
+            {
+                algorithm: fingerprint.type,
+                value: fingerprint.hash
+            }
+        ]
+    };
+    return dtlsParameters;
+}
+exports.extractDtlsParameters = extractDtlsParameters;
+function getCname({ offerMediaObject }) {
+    const ssrcCnameLine = (offerMediaObject.ssrcs || [])
+        .find((line) => line.attribute === 'cname');
+    if (!ssrcCnameLine)
+        return '';
+    return ssrcCnameLine.value;
+}
+exports.getCname = getCname;
+/**
+ * Apply codec parameters in the given SDP m= section answer based on the
+ * given RTP parameters of an offer.
+ */
+function applyCodecParameters({ offerRtpParameters, answerMediaObject }) {
+    for (const codec of offerRtpParameters.codecs) {
+        const mimeType = codec.mimeType.toLowerCase();
+        // Avoid parsing codec parameters for unhandled codecs.
+        if (mimeType !== 'audio/opus')
+            continue;
+        const rtp = (answerMediaObject.rtp || [])
+            .find((r) => r.payload === codec.payloadType);
+        if (!rtp)
+            continue;
+        // Just in case.
+        answerMediaObject.fmtp = answerMediaObject.fmtp || [];
+        let fmtp = answerMediaObject.fmtp
+            .find((f) => f.payload === codec.payloadType);
+        if (!fmtp) {
+            fmtp = { payload: codec.payloadType, config: '' };
+            answerMediaObject.fmtp.push(fmtp);
+        }
+        const parameters = sdpTransform.parseParams(fmtp.config);
+        switch (mimeType) {
+            case 'audio/opus':
+                {
+                    const spropStereo = codec.parameters['sprop-stereo'];
+                    if (spropStereo !== undefined)
+                        parameters.stereo = spropStereo ? 1 : 0;
+                    break;
                 }
-
-                EventEmitter.prototype.emit = function emit(type) {
-                    var er, handler, len, args, i, events;
-                    var doError = type === 'error';
-
-                    events = this._events;
-                    if (events) doError = doError && events.error == null;
-                    else if (!doError) return false;
-
-                    // If there is no 'error' event listener then throw.
-                    if (doError) {
-                        if (arguments.length > 1) er = arguments[1];
-                        if (er instanceof Error) {
-                            throw er; // Unhandled 'error' event
-                        } else {
-                            // At least give some kind of context to the user
-                            var err = new Error('Unhandled "error" event. (' + er + ')');
-                            err.context = er;
-                            throw err;
-                        }
+        }
+        // Write the codec fmtp.config back.
+        fmtp.config = '';
+        for (const key of Object.keys(parameters)) {
+            if (fmtp.config)
+                fmtp.config += ';';
+            fmtp.config += `${key}=${parameters[key]}`;
+        }
+    }
+}
+exports.applyCodecParameters = applyCodecParameters;
+
+},{"sdp-transform":44}],33:[function(require,module,exports){
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.addLegacySimulcast = exports.getRtpEncodings = void 0;
+function getRtpEncodings({ offerMediaObject, track }) {
+    // First media SSRC (or the only one).
+    let firstSsrc;
+    const ssrcs = new Set();
+    for (const line of offerMediaObject.ssrcs || []) {
+        if (line.attribute !== 'msid')
+            continue;
+        const trackId = line.value.split(' ')[1];
+        if (trackId === track.id) {
+            const ssrc = line.id;
+            ssrcs.add(ssrc);
+            if (!firstSsrc)
+                firstSsrc = ssrc;
+        }
+    }
+    if (ssrcs.size === 0)
+        throw new Error(`a=ssrc line with msid information not found [track.id:${track.id}]`);
+    const ssrcToRtxSsrc = new Map();
+    // First assume RTX is used.
+    for (const line of offerMediaObject.ssrcGroups || []) {
+        if (line.semantics !== 'FID')
+            continue;
+        let [ssrc, rtxSsrc] = line.ssrcs.split(/\s+/);
+        ssrc = Number(ssrc);
+        rtxSsrc = Number(rtxSsrc);
+        if (ssrcs.has(ssrc)) {
+            // Remove both the SSRC and RTX SSRC from the set so later we know that they
+            // are already handled.
+            ssrcs.delete(ssrc);
+            ssrcs.delete(rtxSsrc);
+            // Add to the map.
+            ssrcToRtxSsrc.set(ssrc, rtxSsrc);
+        }
+    }
+    // If the set of SSRCs is not empty it means that RTX is not being used, so take
+    // media SSRCs from there.
+    for (const ssrc of ssrcs) {
+        // Add to the map.
+        ssrcToRtxSsrc.set(ssrc, null);
+    }
+    const encodings = [];
+    for (const [ssrc, rtxSsrc] of ssrcToRtxSsrc) {
+        const encoding = { ssrc };
+        if (rtxSsrc)
+            encoding.rtx = { ssrc: rtxSsrc };
+        encodings.push(encoding);
+    }
+    return encodings;
+}
+exports.getRtpEncodings = getRtpEncodings;
+/**
+ * Adds multi-ssrc based simulcast into the given SDP media section offer.
+ */
+function addLegacySimulcast({ offerMediaObject, track, numStreams }) {
+    if (numStreams <= 1)
+        throw new TypeError('numStreams must be greater than 1');
+    let firstSsrc;
+    let firstRtxSsrc;
+    let streamId;
+    // Get the SSRC.
+    const ssrcMsidLine = (offerMediaObject.ssrcs || [])
+        .find((line) => {
+        if (line.attribute !== 'msid')
+            return false;
+        const trackId = line.value.split(' ')[1];
+        if (trackId === track.id) {
+            firstSsrc = line.id;
+            streamId = line.value.split(' ')[0];
+            return true;
+        }
+        else {
+            return false;
+        }
+    });
+    if (!ssrcMsidLine)
+        throw new Error(`a=ssrc line with msid information not found [track.id:${track.id}]`);
+    // Get the SSRC for RTX.
+    (offerMediaObject.ssrcGroups || [])
+        .some((line) => {
+        if (line.semantics !== 'FID')
+            return false;
+        const ssrcs = line.ssrcs.split(/\s+/);
+        if (Number(ssrcs[0]) === firstSsrc) {
+            firstRtxSsrc = Number(ssrcs[1]);
+            return true;
+        }
+        else {
+            return false;
+        }
+    });
+    const ssrcCnameLine = offerMediaObject.ssrcs
+        .find((line) => (line.attribute === 'cname' && line.id === firstSsrc));
+    if (!ssrcCnameLine)
+        throw new Error(`a=ssrc line with cname information not found [track.id:${track.id}]`);
+    const cname = ssrcCnameLine.value;
+    const ssrcs = [];
+    const rtxSsrcs = [];
+    for (let i = 0; i < numStreams; ++i) {
+        ssrcs.push(firstSsrc + i);
+        if (firstRtxSsrc)
+            rtxSsrcs.push(firstRtxSsrc + i);
+    }
+    offerMediaObject.ssrcGroups = offerMediaObject.ssrcGroups || [];
+    offerMediaObject.ssrcs = offerMediaObject.ssrcs || [];
+    offerMediaObject.ssrcGroups.push({
+        semantics: 'SIM',
+        ssrcs: ssrcs.join(' ')
+    });
+    for (let i = 0; i < ssrcs.length; ++i) {
+        const ssrc = ssrcs[i];
+        offerMediaObject.ssrcs.push({
+            id: ssrc,
+            attribute: 'cname',
+            value: cname
+        });
+        offerMediaObject.ssrcs.push({
+            id: ssrc,
+            attribute: 'msid',
+            value: `${streamId} ${track.id}`
+        });
+    }
+    for (let i = 0; i < rtxSsrcs.length; ++i) {
+        const ssrc = ssrcs[i];
+        const rtxSsrc = rtxSsrcs[i];
+        offerMediaObject.ssrcs.push({
+            id: rtxSsrc,
+            attribute: 'cname',
+            value: cname
+        });
+        offerMediaObject.ssrcs.push({
+            id: rtxSsrc,
+            attribute: 'msid',
+            value: `${streamId} ${track.id}`
+        });
+        offerMediaObject.ssrcGroups.push({
+            semantics: 'FID',
+            ssrcs: `${ssrc} ${rtxSsrc}`
+        });
+    }
+}
+exports.addLegacySimulcast = addLegacySimulcast;
+
+},{}],34:[function(require,module,exports){
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.addLegacySimulcast = exports.getRtpEncodings = void 0;
+function getRtpEncodings({ offerMediaObject }) {
+    const ssrcs = new Set();
+    for (const line of offerMediaObject.ssrcs || []) {
+        const ssrc = line.id;
+        ssrcs.add(ssrc);
+    }
+    if (ssrcs.size === 0)
+        throw new Error('no a=ssrc lines found');
+    const ssrcToRtxSsrc = new Map();
+    // First assume RTX is used.
+    for (const line of offerMediaObject.ssrcGroups || []) {
+        if (line.semantics !== 'FID')
+            continue;
+        let [ssrc, rtxSsrc] = line.ssrcs.split(/\s+/);
+        ssrc = Number(ssrc);
+        rtxSsrc = Number(rtxSsrc);
+        if (ssrcs.has(ssrc)) {
+            // Remove both the SSRC and RTX SSRC from the set so later we know that they
+            // are already handled.
+            ssrcs.delete(ssrc);
+            ssrcs.delete(rtxSsrc);
+            // Add to the map.
+            ssrcToRtxSsrc.set(ssrc, rtxSsrc);
+        }
+    }
+    // If the set of SSRCs is not empty it means that RTX is not being used, so take
+    // media SSRCs from there.
+    for (const ssrc of ssrcs) {
+        // Add to the map.
+        ssrcToRtxSsrc.set(ssrc, null);
+    }
+    const encodings = [];
+    for (const [ssrc, rtxSsrc] of ssrcToRtxSsrc) {
+        const encoding = { ssrc };
+        if (rtxSsrc)
+            encoding.rtx = { ssrc: rtxSsrc };
+        encodings.push(encoding);
+    }
+    return encodings;
+}
+exports.getRtpEncodings = getRtpEncodings;
+/**
+ * Adds multi-ssrc based simulcast into the given SDP media section offer.
+ */
+function addLegacySimulcast({ offerMediaObject, numStreams }) {
+    if (numStreams <= 1)
+        throw new TypeError('numStreams must be greater than 1');
+    // Get the SSRC.
+    const ssrcMsidLine = (offerMediaObject.ssrcs || [])
+        .find((line) => line.attribute === 'msid');
+    if (!ssrcMsidLine)
+        throw new Error('a=ssrc line with msid information not found');
+    const [streamId, trackId] = ssrcMsidLine.value.split(' ');
+    const firstSsrc = ssrcMsidLine.id;
+    let firstRtxSsrc;
+    // Get the SSRC for RTX.
+    (offerMediaObject.ssrcGroups || [])
+        .some((line) => {
+        if (line.semantics !== 'FID')
+            return false;
+        const ssrcs = line.ssrcs.split(/\s+/);
+        if (Number(ssrcs[0]) === firstSsrc) {
+            firstRtxSsrc = Number(ssrcs[1]);
+            return true;
+        }
+        else {
+            return false;
+        }
+    });
+    const ssrcCnameLine = offerMediaObject.ssrcs
+        .find((line) => line.attribute === 'cname');
+    if (!ssrcCnameLine)
+        throw new Error('a=ssrc line with cname information not found');
+    const cname = ssrcCnameLine.value;
+    const ssrcs = [];
+    const rtxSsrcs = [];
+    for (let i = 0; i < numStreams; ++i) {
+        ssrcs.push(firstSsrc + i);
+        if (firstRtxSsrc)
+            rtxSsrcs.push(firstRtxSsrc + i);
+    }
+    offerMediaObject.ssrcGroups = [];
+    offerMediaObject.ssrcs = [];
+    offerMediaObject.ssrcGroups.push({
+        semantics: 'SIM',
+        ssrcs: ssrcs.join(' ')
+    });
+    for (let i = 0; i < ssrcs.length; ++i) {
+        const ssrc = ssrcs[i];
+        offerMediaObject.ssrcs.push({
+            id: ssrc,
+            attribute: 'cname',
+            value: cname
+        });
+        offerMediaObject.ssrcs.push({
+            id: ssrc,
+            attribute: 'msid',
+            value: `${streamId} ${trackId}`
+        });
+    }
+    for (let i = 0; i < rtxSsrcs.length; ++i) {
+        const ssrc = ssrcs[i];
+        const rtxSsrc = rtxSsrcs[i];
+        offerMediaObject.ssrcs.push({
+            id: rtxSsrc,
+            attribute: 'cname',
+            value: cname
+        });
+        offerMediaObject.ssrcs.push({
+            id: rtxSsrc,
+            attribute: 'msid',
+            value: `${streamId} ${trackId}`
+        });
+        offerMediaObject.ssrcGroups.push({
+            semantics: 'FID',
+            ssrcs: `${ssrc} ${rtxSsrc}`
+        });
+    }
+}
+exports.addLegacySimulcast = addLegacySimulcast;
+
+},{}],35:[function(require,module,exports){
+"use strict";
+var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
+}) : (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    o[k2] = m[k];
+}));
+var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
+    Object.defineProperty(o, "default", { enumerable: true, value: v });
+}) : function(o, v) {
+    o["default"] = v;
+});
+var __importStar = (this && this.__importStar) || function (mod) {
+    if (mod && mod.__esModule) return mod;
+    var result = {};
+    if (mod != null) for (var k in mod) if (k !== "default" && Object.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
+    __setModuleDefault(result, mod);
+    return result;
+};
+var __importDefault = (this && this.__importDefault) || function (mod) {
+    return (mod && mod.__esModule) ? mod : { "default": mod };
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.debug = exports.detectDevice = exports.Device = exports.version = exports.types = void 0;
+const debug_1 = __importDefault(require("debug"));
+exports.debug = debug_1.default;
+const Device_1 = require("./Device");
+Object.defineProperty(exports, "Device", { enumerable: true, get: function () { return Device_1.Device; } });
+Object.defineProperty(exports, "detectDevice", { enumerable: true, get: function () { return Device_1.detectDevice; } });
+const types = __importStar(require("./types"));
+exports.types = types;
+/**
+ * Expose mediasoup-client version.
+ */
+exports.version = '3.6.37';
+/**
+ * Expose parseScalabilityMode() function.
+ */
+var scalabilityModes_1 = require("./scalabilityModes");
+Object.defineProperty(exports, "parseScalabilityMode", { enumerable: true, get: function () { return scalabilityModes_1.parse; } });
+
+},{"./Device":11,"./scalabilityModes":37,"./types":38,"debug":40}],36:[function(require,module,exports){
+"use strict";
+var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
+}) : (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    o[k2] = m[k];
+}));
+var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
+    Object.defineProperty(o, "default", { enumerable: true, value: v });
+}) : function(o, v) {
+    o["default"] = v;
+});
+var __importStar = (this && this.__importStar) || function (mod) {
+    if (mod && mod.__esModule) return mod;
+    var result = {};
+    if (mod != null) for (var k in mod) if (k !== "default" && Object.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
+    __setModuleDefault(result, mod);
+    return result;
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.canReceive = exports.canSend = exports.generateProbatorRtpParameters = exports.reduceCodecs = exports.getSendingRemoteRtpParameters = exports.getSendingRtpParameters = exports.getRecvRtpCapabilities = exports.getExtendedRtpCapabilities = exports.validateSctpStreamParameters = exports.validateSctpParameters = exports.validateNumSctpStreams = exports.validateSctpCapabilities = exports.validateRtcpParameters = exports.validateRtpEncodingParameters = exports.validateRtpHeaderExtensionParameters = exports.validateRtpCodecParameters = exports.validateRtpParameters = exports.validateRtpHeaderExtension = exports.validateRtcpFeedback = exports.validateRtpCodecCapability = exports.validateRtpCapabilities = void 0;
+const h264 = __importStar(require("h264-profile-level-id"));
+const utils = __importStar(require("./utils"));
+const RTP_PROBATOR_MID = 'probator';
+const RTP_PROBATOR_SSRC = 1234;
+const RTP_PROBATOR_CODEC_PAYLOAD_TYPE = 127;
+/**
+ * Validates RtpCapabilities. It may modify given data by adding missing
+ * fields with default values.
+ * It throws if invalid.
+ */
+function validateRtpCapabilities(caps) {
+    if (typeof caps !== 'object')
+        throw new TypeError('caps is not an object');
+    // codecs is optional. If unset, fill with an empty array.
+    if (caps.codecs && !Array.isArray(caps.codecs))
+        throw new TypeError('caps.codecs is not an array');
+    else if (!caps.codecs)
+        caps.codecs = [];
+    for (const codec of caps.codecs) {
+        validateRtpCodecCapability(codec);
+    }
+    // headerExtensions is optional. If unset, fill with an empty array.
+    if (caps.headerExtensions && !Array.isArray(caps.headerExtensions))
+        throw new TypeError('caps.headerExtensions is not an array');
+    else if (!caps.headerExtensions)
+        caps.headerExtensions = [];
+    for (const ext of caps.headerExtensions) {
+        validateRtpHeaderExtension(ext);
+    }
+}
+exports.validateRtpCapabilities = validateRtpCapabilities;
+/**
+ * Validates RtpCodecCapability. It may modify given data by adding missing
+ * fields with default values.
+ * It throws if invalid.
+ */
+function validateRtpCodecCapability(codec) {
+    const MimeTypeRegex = new RegExp('^(audio|video)/(.+)', 'i');
+    if (typeof codec !== 'object')
+        throw new TypeError('codec is not an object');
+    // mimeType is mandatory.
+    if (!codec.mimeType || typeof codec.mimeType !== 'string')
+        throw new TypeError('missing codec.mimeType');
+    const mimeTypeMatch = MimeTypeRegex.exec(codec.mimeType);
+    if (!mimeTypeMatch)
+        throw new TypeError('invalid codec.mimeType');
+    // Just override kind with media component of mimeType.
+    codec.kind = mimeTypeMatch[1].toLowerCase();
+    // preferredPayloadType is optional.
+    if (codec.preferredPayloadType && typeof codec.preferredPayloadType !== 'number')
+        throw new TypeError('invalid codec.preferredPayloadType');
+    // clockRate is mandatory.
+    if (typeof codec.clockRate !== 'number')
+        throw new TypeError('missing codec.clockRate');
+    // channels is optional. If unset, set it to 1 (just if audio).
+    if (codec.kind === 'audio') {
+        if (typeof codec.channels !== 'number')
+            codec.channels = 1;
+    }
+    else {
+        delete codec.channels;
+    }
+    // parameters is optional. If unset, set it to an empty object.
+    if (!codec.parameters || typeof codec.parameters !== 'object')
+        codec.parameters = {};
+    for (const key of Object.keys(codec.parameters)) {
+        let value = codec.parameters[key];
+        if (value === undefined) {
+            codec.parameters[key] = '';
+            value = '';
+        }
+        if (typeof value !== 'string' && typeof value !== 'number') {
+            throw new TypeError(`invalid codec parameter [key:${key}s, value:${value}]`);
+        }
+        // Specific parameters validation.
+        if (key === 'apt') {
+            if (typeof value !== 'number')
+                throw new TypeError('invalid codec apt parameter');
+        }
+    }
+    // rtcpFeedback is optional. If unset, set it to an empty array.
+    if (!codec.rtcpFeedback || !Array.isArray(codec.rtcpFeedback))
+        codec.rtcpFeedback = [];
+    for (const fb of codec.rtcpFeedback) {
+        validateRtcpFeedback(fb);
+    }
+}
+exports.validateRtpCodecCapability = validateRtpCodecCapability;
+/**
+ * Validates RtcpFeedback. It may modify given data by adding missing
+ * fields with default values.
+ * It throws if invalid.
+ */
+function validateRtcpFeedback(fb) {
+    if (typeof fb !== 'object')
+        throw new TypeError('fb is not an object');
+    // type is mandatory.
+    if (!fb.type || typeof fb.type !== 'string')
+        throw new TypeError('missing fb.type');
+    // parameter is optional. If unset set it to an empty string.
+    if (!fb.parameter || typeof fb.parameter !== 'string')
+        fb.parameter = '';
+}
+exports.validateRtcpFeedback = validateRtcpFeedback;
+/**
+ * Validates RtpHeaderExtension. It may modify given data by adding missing
+ * fields with default values.
+ * It throws if invalid.
+ */
+function validateRtpHeaderExtension(ext) {
+    if (typeof ext !== 'object')
+        throw new TypeError('ext is not an object');
+    // kind is mandatory.
+    if (ext.kind !== 'audio' && ext.kind !== 'video')
+        throw new TypeError('invalid ext.kind');
+    // uri is mandatory.
+    if (!ext.uri || typeof ext.uri !== 'string')
+        throw new TypeError('missing ext.uri');
+    // preferredId is mandatory.
+    if (typeof ext.preferredId !== 'number')
+        throw new TypeError('missing ext.preferredId');
+    // preferredEncrypt is optional. If unset set it to false.
+    if (ext.preferredEncrypt && typeof ext.preferredEncrypt !== 'boolean')
+        throw new TypeError('invalid ext.preferredEncrypt');
+    else if (!ext.preferredEncrypt)
+        ext.preferredEncrypt = false;
+    // direction is optional. If unset set it to sendrecv.
+    if (ext.direction && typeof ext.direction !== 'string')
+        throw new TypeError('invalid ext.direction');
+    else if (!ext.direction)
+        ext.direction = 'sendrecv';
+}
+exports.validateRtpHeaderExtension = validateRtpHeaderExtension;
+/**
+ * Validates RtpParameters. It may modify given data by adding missing
+ * fields with default values.
+ * It throws if invalid.
+ */
+function validateRtpParameters(params) {
+    if (typeof params !== 'object')
+        throw new TypeError('params is not an object');
+    // mid is optional.
+    if (params.mid && typeof params.mid !== 'string')
+        throw new TypeError('params.mid is not a string');
+    // codecs is mandatory.
+    if (!Array.isArray(params.codecs))
+        throw new TypeError('missing params.codecs');
+    for (const codec of params.codecs) {
+        validateRtpCodecParameters(codec);
+    }
+    // headerExtensions is optional. If unset, fill with an empty array.
+    if (params.headerExtensions && !Array.isArray(params.headerExtensions))
+        throw new TypeError('params.headerExtensions is not an array');
+    else if (!params.headerExtensions)
+        params.headerExtensions = [];
+    for (const ext of params.headerExtensions) {
+        validateRtpHeaderExtensionParameters(ext);
+    }
+    // encodings is optional. If unset, fill with an empty array.
+    if (params.encodings && !Array.isArray(params.encodings))
+        throw new TypeError('params.encodings is not an array');
+    else if (!params.encodings)
+        params.encodings = [];
+    for (const encoding of params.encodings) {
+        validateRtpEncodingParameters(encoding);
+    }
+    // rtcp is optional. If unset, fill with an empty object.
+    if (params.rtcp && typeof params.rtcp !== 'object')
+        throw new TypeError('params.rtcp is not an object');
+    else if (!params.rtcp)
+        params.rtcp = {};
+    validateRtcpParameters(params.rtcp);
+}
+exports.validateRtpParameters = validateRtpParameters;
+/**
+ * Validates RtpCodecParameters. It may modify given data by adding missing
+ * fields with default values.
+ * It throws if invalid.
+ */
+function validateRtpCodecParameters(codec) {
+    const MimeTypeRegex = new RegExp('^(audio|video)/(.+)', 'i');
+    if (typeof codec !== 'object')
+        throw new TypeError('codec is not an object');
+    // mimeType is mandatory.
+    if (!codec.mimeType || typeof codec.mimeType !== 'string')
+        throw new TypeError('missing codec.mimeType');
+    const mimeTypeMatch = MimeTypeRegex.exec(codec.mimeType);
+    if (!mimeTypeMatch)
+        throw new TypeError('invalid codec.mimeType');
+    // payloadType is mandatory.
+    if (typeof codec.payloadType !== 'number')
+        throw new TypeError('missing codec.payloadType');
+    // clockRate is mandatory.
+    if (typeof codec.clockRate !== 'number')
+        throw new TypeError('missing codec.clockRate');
+    const kind = mimeTypeMatch[1].toLowerCase();
+    // channels is optional. If unset, set it to 1 (just if audio).
+    if (kind === 'audio') {
+        if (typeof codec.channels !== 'number')
+            codec.channels = 1;
+    }
+    else {
+        delete codec.channels;
+    }
+    // parameters is optional. If unset, set it to an empty object.
+    if (!codec.parameters || typeof codec.parameters !== 'object')
+        codec.parameters = {};
+    for (const key of Object.keys(codec.parameters)) {
+        let value = codec.parameters[key];
+        if (value === undefined) {
+            codec.parameters[key] = '';
+            value = '';
+        }
+        if (typeof value !== 'string' && typeof value !== 'number') {
+            throw new TypeError(`invalid codec parameter [key:${key}s, value:${value}]`);
+        }
+        // Specific parameters validation.
+        if (key === 'apt') {
+            if (typeof value !== 'number')
+                throw new TypeError('invalid codec apt parameter');
+        }
+    }
+    // rtcpFeedback is optional. If unset, set it to an empty array.
+    if (!codec.rtcpFeedback || !Array.isArray(codec.rtcpFeedback))
+        codec.rtcpFeedback = [];
+    for (const fb of codec.rtcpFeedback) {
+        validateRtcpFeedback(fb);
+    }
+}
+exports.validateRtpCodecParameters = validateRtpCodecParameters;
+/**
+ * Validates RtpHeaderExtensionParameteters. It may modify given data by adding missing
+ * fields with default values.
+ * It throws if invalid.
+ */
+function validateRtpHeaderExtensionParameters(ext) {
+    if (typeof ext !== 'object')
+        throw new TypeError('ext is not an object');
+    // uri is mandatory.
+    if (!ext.uri || typeof ext.uri !== 'string')
+        throw new TypeError('missing ext.uri');
+    // id is mandatory.
+    if (typeof ext.id !== 'number')
+        throw new TypeError('missing ext.id');
+    // encrypt is optional. If unset set it to false.
+    if (ext.encrypt && typeof ext.encrypt !== 'boolean')
+        throw new TypeError('invalid ext.encrypt');
+    else if (!ext.encrypt)
+        ext.encrypt = false;
+    // parameters is optional. If unset, set it to an empty object.
+    if (!ext.parameters || typeof ext.parameters !== 'object')
+        ext.parameters = {};
+    for (const key of Object.keys(ext.parameters)) {
+        let value = ext.parameters[key];
+        if (value === undefined) {
+            ext.parameters[key] = '';
+            value = '';
+        }
+        if (typeof value !== 'string' && typeof value !== 'number')
+            throw new TypeError('invalid header extension parameter');
+    }
+}
+exports.validateRtpHeaderExtensionParameters = validateRtpHeaderExtensionParameters;
+/**
+ * Validates RtpEncodingParameters. It may modify given data by adding missing
+ * fields with default values.
+ * It throws if invalid.
+ */
+function validateRtpEncodingParameters(encoding) {
+    if (typeof encoding !== 'object')
+        throw new TypeError('encoding is not an object');
+    // ssrc is optional.
+    if (encoding.ssrc && typeof encoding.ssrc !== 'number')
+        throw new TypeError('invalid encoding.ssrc');
+    // rid is optional.
+    if (encoding.rid && typeof encoding.rid !== 'string')
+        throw new TypeError('invalid encoding.rid');
+    // rtx is optional.
+    if (encoding.rtx && typeof encoding.rtx !== 'object') {
+        throw new TypeError('invalid encoding.rtx');
+    }
+    else if (encoding.rtx) {
+        // RTX ssrc is mandatory if rtx is present.
+        if (typeof encoding.rtx.ssrc !== 'number')
+            throw new TypeError('missing encoding.rtx.ssrc');
+    }
+    // dtx is optional. If unset set it to false.
+    if (!encoding.dtx || typeof encoding.dtx !== 'boolean')
+        encoding.dtx = false;
+    // scalabilityMode is optional.
+    if (encoding.scalabilityMode && typeof encoding.scalabilityMode !== 'string')
+        throw new TypeError('invalid encoding.scalabilityMode');
+}
+exports.validateRtpEncodingParameters = validateRtpEncodingParameters;
+/**
+ * Validates RtcpParameters. It may modify given data by adding missing
+ * fields with default values.
+ * It throws if invalid.
+ */
+function validateRtcpParameters(rtcp) {
+    if (typeof rtcp !== 'object')
+        throw new TypeError('rtcp is not an object');
+    // cname is optional.
+    if (rtcp.cname && typeof rtcp.cname !== 'string')
+        throw new TypeError('invalid rtcp.cname');
+    // reducedSize is optional. If unset set it to true.
+    if (!rtcp.reducedSize || typeof rtcp.reducedSize !== 'boolean')
+        rtcp.reducedSize = true;
+}
+exports.validateRtcpParameters = validateRtcpParameters;
+/**
+ * Validates SctpCapabilities. It may modify given data by adding missing
+ * fields with default values.
+ * It throws if invalid.
+ */
+function validateSctpCapabilities(caps) {
+    if (typeof caps !== 'object')
+        throw new TypeError('caps is not an object');
+    // numStreams is mandatory.
+    if (!caps.numStreams || typeof caps.numStreams !== 'object')
+        throw new TypeError('missing caps.numStreams');
+    validateNumSctpStreams(caps.numStreams);
+}
+exports.validateSctpCapabilities = validateSctpCapabilities;
+/**
+ * Validates NumSctpStreams. It may modify given data by adding missing
+ * fields with default values.
+ * It throws if invalid.
+ */
+function validateNumSctpStreams(numStreams) {
+    if (typeof numStreams !== 'object')
+        throw new TypeError('numStreams is not an object');
+    // OS is mandatory.
+    if (typeof numStreams.OS !== 'number')
+        throw new TypeError('missing numStreams.OS');
+    // MIS is mandatory.
+    if (typeof numStreams.MIS !== 'number')
+        throw new TypeError('missing numStreams.MIS');
+}
+exports.validateNumSctpStreams = validateNumSctpStreams;
+/**
+ * Validates SctpParameters. It may modify given data by adding missing
+ * fields with default values.
+ * It throws if invalid.
+ */
+function validateSctpParameters(params) {
+    if (typeof params !== 'object')
+        throw new TypeError('params is not an object');
+    // port is mandatory.
+    if (typeof params.port !== 'number')
+        throw new TypeError('missing params.port');
+    // OS is mandatory.
+    if (typeof params.OS !== 'number')
+        throw new TypeError('missing params.OS');
+    // MIS is mandatory.
+    if (typeof params.MIS !== 'number')
+        throw new TypeError('missing params.MIS');
+    // maxMessageSize is mandatory.
+    if (typeof params.maxMessageSize !== 'number')
+        throw new TypeError('missing params.maxMessageSize');
+}
+exports.validateSctpParameters = validateSctpParameters;
+/**
+ * Validates SctpStreamParameters. It may modify given data by adding missing
+ * fields with default values.
+ * It throws if invalid.
+ */
+function validateSctpStreamParameters(params) {
+    if (typeof params !== 'object')
+        throw new TypeError('params is not an object');
+    // streamId is mandatory.
+    if (typeof params.streamId !== 'number')
+        throw new TypeError('missing params.streamId');
+    // ordered is optional.
+    let orderedGiven = false;
+    if (typeof params.ordered === 'boolean')
+        orderedGiven = true;
+    else
+        params.ordered = true;
+    // maxPacketLifeTime is optional.
+    if (params.maxPacketLifeTime && typeof params.maxPacketLifeTime !== 'number')
+        throw new TypeError('invalid params.maxPacketLifeTime');
+    // maxRetransmits is optional.
+    if (params.maxRetransmits && typeof params.maxRetransmits !== 'number')
+        throw new TypeError('invalid params.maxRetransmits');
+    if (params.maxPacketLifeTime && params.maxRetransmits)
+        throw new TypeError('cannot provide both maxPacketLifeTime and maxRetransmits');
+    if (orderedGiven &&
+        params.ordered &&
+        (params.maxPacketLifeTime || params.maxRetransmits)) {
+        throw new TypeError('cannot be ordered with maxPacketLifeTime or maxRetransmits');
+    }
+    else if (!orderedGiven && (params.maxPacketLifeTime || params.maxRetransmits)) {
+        params.ordered = false;
+    }
+    // label is optional.
+    if (params.label && typeof params.label !== 'string')
+        throw new TypeError('invalid params.label');
+    // protocol is optional.
+    if (params.protocol && typeof params.protocol !== 'string')
+        throw new TypeError('invalid params.protocol');
+}
+exports.validateSctpStreamParameters = validateSctpStreamParameters;
+/**
+ * Generate extended RTP capabilities for sending and receiving.
+ */
+function getExtendedRtpCapabilities(localCaps, remoteCaps) {
+    const extendedRtpCapabilities = {
+        codecs: [],
+        headerExtensions: []
+    };
+    // Match media codecs and keep the order preferred by remoteCaps.
+    for (const remoteCodec of remoteCaps.codecs || []) {
+        if (isRtxCodec(remoteCodec))
+            continue;
+        const matchingLocalCodec = (localCaps.codecs || [])
+            .find((localCodec) => (matchCodecs(localCodec, remoteCodec, { strict: true, modify: true })));
+        if (!matchingLocalCodec)
+            continue;
+        const extendedCodec = {
+            mimeType: matchingLocalCodec.mimeType,
+            kind: matchingLocalCodec.kind,
+            clockRate: matchingLocalCodec.clockRate,
+            channels: matchingLocalCodec.channels,
+            localPayloadType: matchingLocalCodec.preferredPayloadType,
+            localRtxPayloadType: undefined,
+            remotePayloadType: remoteCodec.preferredPayloadType,
+            remoteRtxPayloadType: undefined,
+            localParameters: matchingLocalCodec.parameters,
+            remoteParameters: remoteCodec.parameters,
+            rtcpFeedback: reduceRtcpFeedback(matchingLocalCodec, remoteCodec)
+        };
+        extendedRtpCapabilities.codecs.push(extendedCodec);
+    }
+    // Match RTX codecs.
+    for (const extendedCodec of extendedRtpCapabilities.codecs) {
+        const matchingLocalRtxCodec = localCaps.codecs
+            .find((localCodec) => (isRtxCodec(localCodec) &&
+            localCodec.parameters.apt === extendedCodec.localPayloadType));
+        const matchingRemoteRtxCodec = remoteCaps.codecs
+            .find((remoteCodec) => (isRtxCodec(remoteCodec) &&
+            remoteCodec.parameters.apt === extendedCodec.remotePayloadType));
+        if (matchingLocalRtxCodec && matchingRemoteRtxCodec) {
+            extendedCodec.localRtxPayloadType = matchingLocalRtxCodec.preferredPayloadType;
+            extendedCodec.remoteRtxPayloadType = matchingRemoteRtxCodec.preferredPayloadType;
+        }
+    }
+    // Match header extensions.
+    for (const remoteExt of remoteCaps.headerExtensions) {
+        const matchingLocalExt = localCaps.headerExtensions
+            .find((localExt) => (matchHeaderExtensions(localExt, remoteExt)));
+        if (!matchingLocalExt)
+            continue;
+        const extendedExt = {
+            kind: remoteExt.kind,
+            uri: remoteExt.uri,
+            sendId: matchingLocalExt.preferredId,
+            recvId: remoteExt.preferredId,
+            encrypt: matchingLocalExt.preferredEncrypt,
+            direction: 'sendrecv'
+        };
+        switch (remoteExt.direction) {
+            case 'sendrecv':
+                extendedExt.direction = 'sendrecv';
+                break;
+            case 'recvonly':
+                extendedExt.direction = 'sendonly';
+                break;
+            case 'sendonly':
+                extendedExt.direction = 'recvonly';
+                break;
+            case 'inactive':
+                extendedExt.direction = 'inactive';
+                break;
+        }
+        extendedRtpCapabilities.headerExtensions.push(extendedExt);
+    }
+    return extendedRtpCapabilities;
+}
+exports.getExtendedRtpCapabilities = getExtendedRtpCapabilities;
+/**
+ * Generate RTP capabilities for receiving media based on the given extended
+ * RTP capabilities.
+ */
+function getRecvRtpCapabilities(extendedRtpCapabilities) {
+    const rtpCapabilities = {
+        codecs: [],
+        headerExtensions: []
+    };
+    for (const extendedCodec of extendedRtpCapabilities.codecs) {
+        const codec = {
+            mimeType: extendedCodec.mimeType,
+            kind: extendedCodec.kind,
+            preferredPayloadType: extendedCodec.remotePayloadType,
+            clockRate: extendedCodec.clockRate,
+            channels: extendedCodec.channels,
+            parameters: extendedCodec.localParameters,
+            rtcpFeedback: extendedCodec.rtcpFeedback
+        };
+        rtpCapabilities.codecs.push(codec);
+        // Add RTX codec.
+        if (!extendedCodec.remoteRtxPayloadType)
+            continue;
+        const rtxCodec = {
+            mimeType: `${extendedCodec.kind}/rtx`,
+            kind: extendedCodec.kind,
+            preferredPayloadType: extendedCodec.remoteRtxPayloadType,
+            clockRate: extendedCodec.clockRate,
+            parameters: {
+                apt: extendedCodec.remotePayloadType
+            },
+            rtcpFeedback: []
+        };
+        rtpCapabilities.codecs.push(rtxCodec);
+        // TODO: In the future, we need to add FEC, CN, etc, codecs.
+    }
+    for (const extendedExtension of extendedRtpCapabilities.headerExtensions) {
+        // Ignore RTP extensions not valid for receiving.
+        if (extendedExtension.direction !== 'sendrecv' &&
+            extendedExtension.direction !== 'recvonly') {
+            continue;
+        }
+        const ext = {
+            kind: extendedExtension.kind,
+            uri: extendedExtension.uri,
+            preferredId: extendedExtension.recvId,
+            preferredEncrypt: extendedExtension.encrypt,
+            direction: extendedExtension.direction
+        };
+        rtpCapabilities.headerExtensions.push(ext);
+    }
+    return rtpCapabilities;
+}
+exports.getRecvRtpCapabilities = getRecvRtpCapabilities;
+/**
+ * Generate RTP parameters of the given kind for sending media.
+ * NOTE: mid, encodings and rtcp fields are left empty.
+ */
+function getSendingRtpParameters(kind, extendedRtpCapabilities) {
+    const rtpParameters = {
+        mid: undefined,
+        codecs: [],
+        headerExtensions: [],
+        encodings: [],
+        rtcp: {}
+    };
+    for (const extendedCodec of extendedRtpCapabilities.codecs) {
+        if (extendedCodec.kind !== kind)
+            continue;
+        const codec = {
+            mimeType: extendedCodec.mimeType,
+            payloadType: extendedCodec.localPayloadType,
+            clockRate: extendedCodec.clockRate,
+            channels: extendedCodec.channels,
+            parameters: extendedCodec.localParameters,
+            rtcpFeedback: extendedCodec.rtcpFeedback
+        };
+        rtpParameters.codecs.push(codec);
+        // Add RTX codec.
+        if (extendedCodec.localRtxPayloadType) {
+            const rtxCodec = {
+                mimeType: `${extendedCodec.kind}/rtx`,
+                payloadType: extendedCodec.localRtxPayloadType,
+                clockRate: extendedCodec.clockRate,
+                parameters: {
+                    apt: extendedCodec.localPayloadType
+                },
+                rtcpFeedback: []
+            };
+            rtpParameters.codecs.push(rtxCodec);
+        }
+    }
+    for (const extendedExtension of extendedRtpCapabilities.headerExtensions) {
+        // Ignore RTP extensions of a different kind and those not valid for sending.
+        if ((extendedExtension.kind && extendedExtension.kind !== kind) ||
+            (extendedExtension.direction !== 'sendrecv' &&
+                extendedExtension.direction !== 'sendonly')) {
+            continue;
+        }
+        const ext = {
+            uri: extendedExtension.uri,
+            id: extendedExtension.sendId,
+            encrypt: extendedExtension.encrypt,
+            parameters: {}
+        };
+        rtpParameters.headerExtensions.push(ext);
+    }
+    return rtpParameters;
+}
+exports.getSendingRtpParameters = getSendingRtpParameters;
+/**
+ * Generate RTP parameters of the given kind suitable for the remote SDP answer.
+ */
+function getSendingRemoteRtpParameters(kind, extendedRtpCapabilities) {
+    const rtpParameters = {
+        mid: undefined,
+        codecs: [],
+        headerExtensions: [],
+        encodings: [],
+        rtcp: {}
+    };
+    for (const extendedCodec of extendedRtpCapabilities.codecs) {
+        if (extendedCodec.kind !== kind)
+            continue;
+        const codec = {
+            mimeType: extendedCodec.mimeType,
+            payloadType: extendedCodec.localPayloadType,
+            clockRate: extendedCodec.clockRate,
+            channels: extendedCodec.channels,
+            parameters: extendedCodec.remoteParameters,
+            rtcpFeedback: extendedCodec.rtcpFeedback
+        };
+        rtpParameters.codecs.push(codec);
+        // Add RTX codec.
+        if (extendedCodec.localRtxPayloadType) {
+            const rtxCodec = {
+                mimeType: `${extendedCodec.kind}/rtx`,
+                payloadType: extendedCodec.localRtxPayloadType,
+                clockRate: extendedCodec.clockRate,
+                parameters: {
+                    apt: extendedCodec.localPayloadType
+                },
+                rtcpFeedback: []
+            };
+            rtpParameters.codecs.push(rtxCodec);
+        }
+    }
+    for (const extendedExtension of extendedRtpCapabilities.headerExtensions) {
+        // Ignore RTP extensions of a different kind and those not valid for sending.
+        if ((extendedExtension.kind && extendedExtension.kind !== kind) ||
+            (extendedExtension.direction !== 'sendrecv' &&
+                extendedExtension.direction !== 'sendonly')) {
+            continue;
+        }
+        const ext = {
+            uri: extendedExtension.uri,
+            id: extendedExtension.sendId,
+            encrypt: extendedExtension.encrypt,
+            parameters: {}
+        };
+        rtpParameters.headerExtensions.push(ext);
+    }
+    // Reduce codecs' RTCP feedback. Use Transport-CC if available, REMB otherwise.
+    if (rtpParameters.headerExtensions.some((ext) => (ext.uri === 'http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01'))) {
+        for (const codec of rtpParameters.codecs) {
+            codec.rtcpFeedback = (codec.rtcpFeedback || [])
+                .filter((fb) => fb.type !== 'goog-remb');
+        }
+    }
+    else if (rtpParameters.headerExtensions.some((ext) => (ext.uri === 'http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time'))) {
+        for (const codec of rtpParameters.codecs) {
+            codec.rtcpFeedback = (codec.rtcpFeedback || [])
+                .filter((fb) => fb.type !== 'transport-cc');
+        }
+    }
+    else {
+        for (const codec of rtpParameters.codecs) {
+            codec.rtcpFeedback = (codec.rtcpFeedback || [])
+                .filter((fb) => (fb.type !== 'transport-cc' &&
+                fb.type !== 'goog-remb'));
+        }
+    }
+    return rtpParameters;
+}
+exports.getSendingRemoteRtpParameters = getSendingRemoteRtpParameters;
+/**
+ * Reduce given codecs by returning an array of codecs "compatible" with the
+ * given capability codec. If no capability codec is given, take the first
+ * one(s).
+ *
+ * Given codecs must be generated by ortc.getSendingRtpParameters() or
+ * ortc.getSendingRemoteRtpParameters().
+ *
+ * The returned array of codecs also include a RTX codec if available.
+ */
+function reduceCodecs(codecs, capCodec) {
+    const filteredCodecs = [];
+    // If no capability codec is given, take the first one (and RTX).
+    if (!capCodec) {
+        filteredCodecs.push(codecs[0]);
+        if (isRtxCodec(codecs[1]))
+            filteredCodecs.push(codecs[1]);
+    }
+    // Otherwise look for a compatible set of codecs.
+    else {
+        for (let idx = 0; idx < codecs.length; ++idx) {
+            if (matchCodecs(codecs[idx], capCodec)) {
+                filteredCodecs.push(codecs[idx]);
+                if (isRtxCodec(codecs[idx + 1]))
+                    filteredCodecs.push(codecs[idx + 1]);
+                break;
+            }
+        }
+        if (filteredCodecs.length === 0)
+            throw new TypeError('no matching codec found');
+    }
+    return filteredCodecs;
+}
+exports.reduceCodecs = reduceCodecs;
+/**
+ * Create RTP parameters for a Consumer for the RTP probator.
+ */
+function generateProbatorRtpParameters(videoRtpParameters) {
+    // Clone given reference video RTP parameters.
+    videoRtpParameters = utils.clone(videoRtpParameters, {});
+    // This may throw.
+    validateRtpParameters(videoRtpParameters);
+    const rtpParameters = {
+        mid: RTP_PROBATOR_MID,
+        codecs: [],
+        headerExtensions: [],
+        encodings: [{ ssrc: RTP_PROBATOR_SSRC }],
+        rtcp: { cname: 'probator' }
+    };
+    rtpParameters.codecs.push(videoRtpParameters.codecs[0]);
+    rtpParameters.codecs[0].payloadType = RTP_PROBATOR_CODEC_PAYLOAD_TYPE;
+    rtpParameters.headerExtensions = videoRtpParameters.headerExtensions;
+    return rtpParameters;
+}
+exports.generateProbatorRtpParameters = generateProbatorRtpParameters;
+/**
+ * Whether media can be sent based on the given RTP capabilities.
+ */
+function canSend(kind, extendedRtpCapabilities) {
+    return extendedRtpCapabilities.codecs.
+        some((codec) => codec.kind === kind);
+}
+exports.canSend = canSend;
+/**
+ * Whether the given RTP parameters can be received with the given RTP
+ * capabilities.
+ */
+function canReceive(rtpParameters, extendedRtpCapabilities) {
+    // This may throw.
+    validateRtpParameters(rtpParameters);
+    if (rtpParameters.codecs.length === 0)
+        return false;
+    const firstMediaCodec = rtpParameters.codecs[0];
+    return extendedRtpCapabilities.codecs
+        .some((codec) => codec.remotePayloadType === firstMediaCodec.payloadType);
+}
+exports.canReceive = canReceive;
+function isRtxCodec(codec) {
+    if (!codec)
+        return false;
+    return /.+\/rtx$/i.test(codec.mimeType);
+}
+function matchCodecs(aCodec, bCodec, { strict = false, modify = false } = {}) {
+    const aMimeType = aCodec.mimeType.toLowerCase();
+    const bMimeType = bCodec.mimeType.toLowerCase();
+    if (aMimeType !== bMimeType)
+        return false;
+    if (aCodec.clockRate !== bCodec.clockRate)
+        return false;
+    if (aCodec.channels !== bCodec.channels)
+        return false;
+    // Per codec special checks.
+    switch (aMimeType) {
+        case 'video/h264':
+            {
+                const aPacketizationMode = aCodec.parameters['packetization-mode'] || 0;
+                const bPacketizationMode = bCodec.parameters['packetization-mode'] || 0;
+                if (aPacketizationMode !== bPacketizationMode)
+                    return false;
+                // If strict matching check profile-level-id.
+                if (strict) {
+                    if (!h264.isSameProfile(aCodec.parameters, bCodec.parameters))
                         return false;
+                    let selectedProfileLevelId;
+                    try {
+                        selectedProfileLevelId =
+                            h264.generateProfileLevelIdForAnswer(aCodec.parameters, bCodec.parameters);
                     }
-
-                    handler = events[type];
-
-                    if (!handler) return false;
-
-                    var isFn = typeof handler === 'function';
-                    len = arguments.length;
-                    switch (len) {
-                        // fast cases
-                        case 1:
-                            emitNone(handler, isFn, this);
-                            break;
-                        case 2:
-                            emitOne(handler, isFn, this, arguments[1]);
-                            break;
-                        case 3:
-                            emitTwo(handler, isFn, this, arguments[1], arguments[2]);
-                            break;
-                        case 4:
-                            emitThree(handler, isFn, this, arguments[1], arguments[2], arguments[3]);
-                            break;
-                        // slower
-                        default:
-                            args = new Array(len - 1);
-                            for (i = 1; i < len; i++) args[i - 1] = arguments[i];
-                            emitMany(handler, isFn, this, args);
-                    }
-
-                    return true;
-                };
-
-                function _addListener(target, type, listener, prepend) {
-                    var m;
-                    var events;
-                    var existing;
-
-                    if (typeof listener !== 'function') throw new TypeError('"listener" argument must be a function');
-
-                    events = target._events;
-                    if (!events) {
-                        events = target._events = objectCreate(null);
-                        target._eventsCount = 0;
-                    } else {
-                        // To avoid recursion in the case that type === "newListener"! Before
-                        // adding it to the listeners, first emit "newListener".
-                        if (events.newListener) {
-                            target.emit('newListener', type, listener.listener ? listener.listener : listener);
-
-                            // Re-assign `events` because a newListener handler could have caused the
-                            // this._events to be assigned to a new object
-                            events = target._events;
-                        }
-                        existing = events[type];
-                    }
-
-                    if (!existing) {
-                        // Optimize the case of one listener. Don't need the extra array object.
-                        existing = events[type] = listener;
-                        ++target._eventsCount;
-                    } else {
-                        if (typeof existing === 'function') {
-                            // Adding the second element, need to change to array.
-                            existing = events[type] = prepend ? [listener, existing] : [existing, listener];
-                        } else {
-                            // If we've already got an array, just append.
-                            if (prepend) {
-                                existing.unshift(listener);
-                            } else {
-                                existing.push(listener);
-                            }
-                        }
-
-                        // Check for listener leak
-                        if (!existing.warned) {
-                            m = $getMaxListeners(target);
-                            if (m && m > 0 && existing.length > m) {
-                                existing.warned = true;
-                                var w = new Error(
-                                    'Possible EventEmitter memory leak detected. ' +
-                                        existing.length +
-                                        ' "' +
-                                        String(type) +
-                                        '" listeners ' +
-                                        'added. Use emitter.setMaxListeners() to ' +
-                                        'increase limit.',
-                                );
-                                w.name = 'MaxListenersExceededWarning';
-                                w.emitter = target;
-                                w.type = type;
-                                w.count = existing.length;
-                                if (typeof console === 'object' && console.warn) {
-                                    console.warn('%s: %s', w.name, w.message);
-                                }
-                            }
-                        }
+                    catch (error) {
+                        return false;
                     }
-
-                    return target;
-                }
-
-                EventEmitter.prototype.addListener = function addListener(type, listener) {
-                    return _addListener(this, type, listener, false);
-                };
-
-                EventEmitter.prototype.on = EventEmitter.prototype.addListener;
-
-                EventEmitter.prototype.prependListener = function prependListener(type, listener) {
-                    return _addListener(this, type, listener, true);
-                };
-
-                function onceWrapper() {
-                    if (!this.fired) {
-                        this.target.removeListener(this.type, this.wrapFn);
-                        this.fired = true;
-                        switch (arguments.length) {
-                            case 0:
-                                return this.listener.call(this.target);
-                            case 1:
-                                return this.listener.call(this.target, arguments[0]);
-                            case 2:
-                                return this.listener.call(this.target, arguments[0], arguments[1]);
-                            case 3:
-                                return this.listener.call(this.target, arguments[0], arguments[1], arguments[2]);
-                            default:
-                                var args = new Array(arguments.length);
-                                for (var i = 0; i < args.length; ++i) args[i] = arguments[i];
-                                this.listener.apply(this.target, args);
+                    if (modify) {
+                        if (selectedProfileLevelId) {
+                            aCodec.parameters['profile-level-id'] = selectedProfileLevelId;
+                            bCodec.parameters['profile-level-id'] = selectedProfileLevelId;
+                        }
+                        else {
+                            delete aCodec.parameters['profile-level-id'];
+                            delete bCodec.parameters['profile-level-id'];
                         }
                     }
                 }
-
-                function _onceWrap(target, type, listener) {
-                    var state = { fired: false, wrapFn: undefined, target: target, type: type, listener: listener };
-                    var wrapped = bind.call(onceWrapper, state);
-                    wrapped.listener = listener;
-                    state.wrapFn = wrapped;
-                    return wrapped;
+                break;
+            }
+        case 'video/vp9':
+            {
+                // If strict matching check profile-id.
+                if (strict) {
+                    const aProfileId = aCodec.parameters['profile-id'] || 0;
+                    const bProfileId = bCodec.parameters['profile-id'] || 0;
+                    if (aProfileId !== bProfileId)
+                        return false;
                 }
+                break;
+            }
+    }
+    return true;
+}
+function matchHeaderExtensions(aExt, bExt) {
+    if (aExt.kind && bExt.kind && aExt.kind !== bExt.kind)
+        return false;
+    if (aExt.uri !== bExt.uri)
+        return false;
+    return true;
+}
+function reduceRtcpFeedback(codecA, codecB) {
+    const reducedRtcpFeedback = [];
+    for (const aFb of codecA.rtcpFeedback || []) {
+        const matchingBFb = (codecB.rtcpFeedback || [])
+            .find((bFb) => (bFb.type === aFb.type &&
+            (bFb.parameter === aFb.parameter || (!bFb.parameter && !aFb.parameter))));
+        if (matchingBFb)
+            reducedRtcpFeedback.push(matchingBFb);
+    }
+    return reducedRtcpFeedback;
+}
+
+},{"./utils":39,"h264-profile-level-id":4}],37:[function(require,module,exports){
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.parse = void 0;
+const ScalabilityModeRegex = new RegExp('^[LS]([1-9]\\d{0,1})T([1-9]\\d{0,1})');
+function parse(scalabilityMode) {
+    const match = ScalabilityModeRegex.exec(scalabilityMode || '');
+    if (match) {
+        return {
+            spatialLayers: Number(match[1]),
+            temporalLayers: Number(match[2])
+        };
+    }
+    else {
+        return {
+            spatialLayers: 1,
+            temporalLayers: 1
+        };
+    }
+}
+exports.parse = parse;
+
+},{}],38:[function(require,module,exports){
+"use strict";
+var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
+}) : (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    o[k2] = m[k];
+}));
+var __exportStar = (this && this.__exportStar) || function(m, exports) {
+    for (var p in m) if (p !== "default" && !exports.hasOwnProperty(p)) __createBinding(exports, m, p);
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+__exportStar(require("./Device"), exports);
+__exportStar(require("./Transport"), exports);
+__exportStar(require("./Producer"), exports);
+__exportStar(require("./Consumer"), exports);
+__exportStar(require("./DataProducer"), exports);
+__exportStar(require("./DataConsumer"), exports);
+__exportStar(require("./RtpParameters"), exports);
+__exportStar(require("./SctpParameters"), exports);
+__exportStar(require("./handlers/HandlerInterface"), exports);
+__exportStar(require("./errors"), exports);
+
+},{"./Consumer":8,"./DataConsumer":9,"./DataProducer":10,"./Device":11,"./Producer":14,"./RtpParameters":15,"./SctpParameters":16,"./Transport":17,"./errors":18,"./handlers/HandlerInterface":25}],39:[function(require,module,exports){
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.generateRandomNumber = exports.clone = void 0;
+/**
+ * Clones the given data.
+ */
+function clone(data, defaultValue) {
+    if (typeof data === 'undefined')
+        return defaultValue;
+    return JSON.parse(JSON.stringify(data));
+}
+exports.clone = clone;
+/**
+ * Generates a random positive integer.
+ */
+function generateRandomNumber() {
+    return Math.round(Math.random() * 10000000);
+}
+exports.generateRandomNumber = generateRandomNumber;
+
+},{}],40:[function(require,module,exports){
+arguments[4][5][0].apply(exports,arguments)
+},{"./common":41,"_process":48,"dup":5}],41:[function(require,module,exports){
+arguments[4][6][0].apply(exports,arguments)
+},{"dup":6,"ms":42}],42:[function(require,module,exports){
+arguments[4][7][0].apply(exports,arguments)
+},{"dup":7}],43:[function(require,module,exports){
+var grammar = module.exports = {
+  v: [{
+    name: 'version',
+    reg: /^(\d*)$/
+  }],
+  o: [{
+    // o=- 20518 0 IN IP4 203.0.113.1
+    // NB: sessionId will be a String in most cases because it is huge
+    name: 'origin',
+    reg: /^(\S*) (\d*) (\d*) (\S*) IP(\d) (\S*)/,
+    names: ['username', 'sessionId', 'sessionVersion', 'netType', 'ipVer', 'address'],
+    format: '%s %s %d %s IP%d %s'
+  }],
+  // default parsing of these only (though some of these feel outdated)
+  s: [{ name: 'name' }],
+  i: [{ name: 'description' }],
+  u: [{ name: 'uri' }],
+  e: [{ name: 'email' }],
+  p: [{ name: 'phone' }],
+  z: [{ name: 'timezones' }], // TODO: this one can actually be parsed properly...
+  r: [{ name: 'repeats' }],   // TODO: this one can also be parsed properly
+  // k: [{}], // outdated thing ignored
+  t: [{
+    // t=0 0
+    name: 'timing',
+    reg: /^(\d*) (\d*)/,
+    names: ['start', 'stop'],
+    format: '%d %d'
+  }],
+  c: [{
+    // c=IN IP4 10.47.197.26
+    name: 'connection',
+    reg: /^IN IP(\d) (\S*)/,
+    names: ['version', 'ip'],
+    format: 'IN IP%d %s'
+  }],
+  b: [{
+    // b=AS:4000
+    push: 'bandwidth',
+    reg: /^(TIAS|AS|CT|RR|RS):(\d*)/,
+    names: ['type', 'limit'],
+    format: '%s:%s'
+  }],
+  m: [{
+    // m=video 51744 RTP/AVP 126 97 98 34 31
+    // NB: special - pushes to session
+    // TODO: rtp/fmtp should be filtered by the payloads found here?
+    reg: /^(\w*) (\d*) ([\w/]*)(?: (.*))?/,
+    names: ['type', 'port', 'protocol', 'payloads'],
+    format: '%s %d %s %s'
+  }],
+  a: [
+    {
+      // a=rtpmap:110 opus/48000/2
+      push: 'rtp',
+      reg: /^rtpmap:(\d*) ([\w\-.]*)(?:\s*\/(\d*)(?:\s*\/(\S*))?)?/,
+      names: ['payload', 'codec', 'rate', 'encoding'],
+      format: function (o) {
+        return (o.encoding)
+          ? 'rtpmap:%d %s/%s/%s'
+          : o.rate
+            ? 'rtpmap:%d %s/%s'
+            : 'rtpmap:%d %s';
+      }
+    },
+    {
+      // a=fmtp:108 profile-level-id=24;object=23;bitrate=64000
+      // a=fmtp:111 minptime=10; useinbandfec=1
+      push: 'fmtp',
+      reg: /^fmtp:(\d*) ([\S| ]*)/,
+      names: ['payload', 'config'],
+      format: 'fmtp:%d %s'
+    },
+    {
+      // a=control:streamid=0
+      name: 'control',
+      reg: /^control:(.*)/,
+      format: 'control:%s'
+    },
+    {
+      // a=rtcp:65179 IN IP4 193.84.77.194
+      name: 'rtcp',
+      reg: /^rtcp:(\d*)(?: (\S*) IP(\d) (\S*))?/,
+      names: ['port', 'netType', 'ipVer', 'address'],
+      format: function (o) {
+        return (o.address != null)
+          ? 'rtcp:%d %s IP%d %s'
+          : 'rtcp:%d';
+      }
+    },
+    {
+      // a=rtcp-fb:98 trr-int 100
+      push: 'rtcpFbTrrInt',
+      reg: /^rtcp-fb:(\*|\d*) trr-int (\d*)/,
+      names: ['payload', 'value'],
+      format: 'rtcp-fb:%s trr-int %d'
+    },
+    {
+      // a=rtcp-fb:98 nack rpsi
+      push: 'rtcpFb',
+      reg: /^rtcp-fb:(\*|\d*) ([\w-_]*)(?: ([\w-_]*))?/,
+      names: ['payload', 'type', 'subtype'],
+      format: function (o) {
+        return (o.subtype != null)
+          ? 'rtcp-fb:%s %s %s'
+          : 'rtcp-fb:%s %s';
+      }
+    },
+    {
+      // a=extmap:2 urn:ietf:params:rtp-hdrext:toffset
+      // a=extmap:1/recvonly URI-gps-string
+      // a=extmap:3 urn:ietf:params:rtp-hdrext:encrypt urn:ietf:params:rtp-hdrext:smpte-tc 25@600/24
+      push: 'ext',
+      reg: /^extmap:(\d+)(?:\/(\w+))?(?: (urn:ietf:params:rtp-hdrext:encrypt))? (\S*)(?: (\S*))?/,
+      names: ['value', 'direction', 'encrypt-uri', 'uri', 'config'],
+      format: function (o) {
+        return (
+          'extmap:%d' +
+          (o.direction ? '/%s' : '%v') +
+          (o['encrypt-uri'] ? ' %s' : '%v') +
+          ' %s' +
+          (o.config ? ' %s' : '')
+        );
+      }
+    },
+    {
+      // a=extmap-allow-mixed
+      name: 'extmapAllowMixed',
+      reg: /^(extmap-allow-mixed)/
+    },
+    {
+      // a=crypto:1 AES_CM_128_HMAC_SHA1_80 inline:PS1uQCVeeCFCanVmcjkpPywjNWhcYD0mXXtxaVBR|2^20|1:32
+      push: 'crypto',
+      reg: /^crypto:(\d*) ([\w_]*) (\S*)(?: (\S*))?/,
+      names: ['id', 'suite', 'config', 'sessionConfig'],
+      format: function (o) {
+        return (o.sessionConfig != null)
+          ? 'crypto:%d %s %s %s'
+          : 'crypto:%d %s %s';
+      }
+    },
+    {
+      // a=setup:actpass
+      name: 'setup',
+      reg: /^setup:(\w*)/,
+      format: 'setup:%s'
+    },
+    {
+      // a=connection:new
+      name: 'connectionType',
+      reg: /^connection:(new|existing)/,
+      format: 'connection:%s'
+    },
+    {
+      // a=mid:1
+      name: 'mid',
+      reg: /^mid:([^\s]*)/,
+      format: 'mid:%s'
+    },
+    {
+      // a=msid:0c8b064d-d807-43b4-b434-f92a889d8587 98178685-d409-46e0-8e16-7ef0db0db64a
+      name: 'msid',
+      reg: /^msid:(.*)/,
+      format: 'msid:%s'
+    },
+    {
+      // a=ptime:20
+      name: 'ptime',
+      reg: /^ptime:(\d*(?:\.\d*)*)/,
+      format: 'ptime:%d'
+    },
+    {
+      // a=maxptime:60
+      name: 'maxptime',
+      reg: /^maxptime:(\d*(?:\.\d*)*)/,
+      format: 'maxptime:%d'
+    },
+    {
+      // a=sendrecv
+      name: 'direction',
+      reg: /^(sendrecv|recvonly|sendonly|inactive)/
+    },
+    {
+      // a=ice-lite
+      name: 'icelite',
+      reg: /^(ice-lite)/
+    },
+    {
+      // a=ice-ufrag:F7gI
+      name: 'iceUfrag',
+      reg: /^ice-ufrag:(\S*)/,
+      format: 'ice-ufrag:%s'
+    },
+    {
+      // a=ice-pwd:x9cml/YzichV2+XlhiMu8g
+      name: 'icePwd',
+      reg: /^ice-pwd:(\S*)/,
+      format: 'ice-pwd:%s'
+    },
+    {
+      // a=fingerprint:SHA-1 00:11:22:33:44:55:66:77:88:99:AA:BB:CC:DD:EE:FF:00:11:22:33
+      name: 'fingerprint',
+      reg: /^fingerprint:(\S*) (\S*)/,
+      names: ['type', 'hash'],
+      format: 'fingerprint:%s %s'
+    },
+    {
+      // a=candidate:0 1 UDP 2113667327 203.0.113.1 54400 typ host
+      // a=candidate:1162875081 1 udp 2113937151 192.168.34.75 60017 typ host generation 0 network-id 3 network-cost 10
+      // a=candidate:3289912957 2 udp 1845501695 193.84.77.194 60017 typ srflx raddr 192.168.34.75 rport 60017 generation 0 network-id 3 network-cost 10
+      // a=candidate:229815620 1 tcp 1518280447 192.168.150.19 60017 typ host tcptype active generation 0 network-id 3 network-cost 10
+      // a=candidate:3289912957 2 tcp 1845501695 193.84.77.194 60017 typ srflx raddr 192.168.34.75 rport 60017 tcptype passive generation 0 network-id 3 network-cost 10
+      push:'candidates',
+      reg: /^candidate:(\S*) (\d*) (\S*) (\d*) (\S*) (\d*) typ (\S*)(?: raddr (\S*) rport (\d*))?(?: tcptype (\S*))?(?: generation (\d*))?(?: network-id (\d*))?(?: network-cost (\d*))?/,
+      names: ['foundation', 'component', 'transport', 'priority', 'ip', 'port', 'type', 'raddr', 'rport', 'tcptype', 'generation', 'network-id', 'network-cost'],
+      format: function (o) {
+        var str = 'candidate:%s %d %s %d %s %d typ %s';
+
+        str += (o.raddr != null) ? ' raddr %s rport %d' : '%v%v';
+
+        // NB: candidate has three optional chunks, so %void middles one if it's missing
+        str += (o.tcptype != null) ? ' tcptype %s' : '%v';
+
+        if (o.generation != null) {
+          str += ' generation %d';
+        }
 
-                EventEmitter.prototype.once = function once(type, listener) {
-                    if (typeof listener !== 'function') throw new TypeError('"listener" argument must be a function');
-                    this.on(type, _onceWrap(this, type, listener));
-                    return this;
-                };
-
-                EventEmitter.prototype.prependOnceListener = function prependOnceListener(type, listener) {
-                    if (typeof listener !== 'function') throw new TypeError('"listener" argument must be a function');
-                    this.prependListener(type, _onceWrap(this, type, listener));
-                    return this;
-                };
-
-                // Emits a 'removeListener' event if and only if the listener was removed.
-                EventEmitter.prototype.removeListener = function removeListener(type, listener) {
-                    var list, events, position, i, originalListener;
-
-                    if (typeof listener !== 'function') throw new TypeError('"listener" argument must be a function');
-
-                    events = this._events;
-                    if (!events) return this;
-
-                    list = events[type];
-                    if (!list) return this;
-
-                    if (list === listener || list.listener === listener) {
-                        if (--this._eventsCount === 0) this._events = objectCreate(null);
-                        else {
-                            delete events[type];
-                            if (events.removeListener) this.emit('removeListener', type, list.listener || listener);
-                        }
-                    } else if (typeof list !== 'function') {
-                        position = -1;
-
-                        for (i = list.length - 1; i >= 0; i--) {
-                            if (list[i] === listener || list[i].listener === listener) {
-                                originalListener = list[i].listener;
-                                position = i;
-                                break;
-                            }
-                        }
-
-                        if (position < 0) return this;
-
-                        if (position === 0) list.shift();
-                        else spliceOne(list, position);
+        str += (o['network-id'] != null) ? ' network-id %d' : '%v';
+        str += (o['network-cost'] != null) ? ' network-cost %d' : '%v';
+        return str;
+      }
+    },
+    {
+      // a=end-of-candidates (keep after the candidates line for readability)
+      name: 'endOfCandidates',
+      reg: /^(end-of-candidates)/
+    },
+    {
+      // a=remote-candidates:1 203.0.113.1 54400 2 203.0.113.1 54401 ...
+      name: 'remoteCandidates',
+      reg: /^remote-candidates:(.*)/,
+      format: 'remote-candidates:%s'
+    },
+    {
+      // a=ice-options:google-ice
+      name: 'iceOptions',
+      reg: /^ice-options:(\S*)/,
+      format: 'ice-options:%s'
+    },
+    {
+      // a=ssrc:2566107569 cname:t9YU8M1UxTF8Y1A1
+      push: 'ssrcs',
+      reg: /^ssrc:(\d*) ([\w_-]*)(?::(.*))?/,
+      names: ['id', 'attribute', 'value'],
+      format: function (o) {
+        var str = 'ssrc:%d';
+        if (o.attribute != null) {
+          str += ' %s';
+          if (o.value != null) {
+            str += ':%s';
+          }
+        }
+        return str;
+      }
+    },
+    {
+      // a=ssrc-group:FEC 1 2
+      // a=ssrc-group:FEC-FR 3004364195 1080772241
+      push: 'ssrcGroups',
+      // token-char = %x21 / %x23-27 / %x2A-2B / %x2D-2E / %x30-39 / %x41-5A / %x5E-7E
+      reg: /^ssrc-group:([\x21\x23\x24\x25\x26\x27\x2A\x2B\x2D\x2E\w]*) (.*)/,
+      names: ['semantics', 'ssrcs'],
+      format: 'ssrc-group:%s %s'
+    },
+    {
+      // a=msid-semantic: WMS Jvlam5X3SX1OP6pn20zWogvaKJz5Hjf9OnlV
+      name: 'msidSemantic',
+      reg: /^msid-semantic:\s?(\w*) (\S*)/,
+      names: ['semantic', 'token'],
+      format: 'msid-semantic: %s %s' // space after ':' is not accidental
+    },
+    {
+      // a=group:BUNDLE audio video
+      push: 'groups',
+      reg: /^group:(\w*) (.*)/,
+      names: ['type', 'mids'],
+      format: 'group:%s %s'
+    },
+    {
+      // a=rtcp-mux
+      name: 'rtcpMux',
+      reg: /^(rtcp-mux)/
+    },
+    {
+      // a=rtcp-rsize
+      name: 'rtcpRsize',
+      reg: /^(rtcp-rsize)/
+    },
+    {
+      // a=sctpmap:5000 webrtc-datachannel 1024
+      name: 'sctpmap',
+      reg: /^sctpmap:([\w_/]*) (\S*)(?: (\S*))?/,
+      names: ['sctpmapNumber', 'app', 'maxMessageSize'],
+      format: function (o) {
+        return (o.maxMessageSize != null)
+          ? 'sctpmap:%s %s %s'
+          : 'sctpmap:%s %s';
+      }
+    },
+    {
+      // a=x-google-flag:conference
+      name: 'xGoogleFlag',
+      reg: /^x-google-flag:([^\s]*)/,
+      format: 'x-google-flag:%s'
+    },
+    {
+      // a=rid:1 send max-width=1280;max-height=720;max-fps=30;depend=0
+      push: 'rids',
+      reg: /^rid:([\d\w]+) (\w+)(?: ([\S| ]*))?/,
+      names: ['id', 'direction', 'params'],
+      format: function (o) {
+        return (o.params) ? 'rid:%s %s %s' : 'rid:%s %s';
+      }
+    },
+    {
+      // a=imageattr:97 send [x=800,y=640,sar=1.1,q=0.6] [x=480,y=320] recv [x=330,y=250]
+      // a=imageattr:* send [x=800,y=640] recv *
+      // a=imageattr:100 recv [x=320,y=240]
+      push: 'imageattrs',
+      reg: new RegExp(
+        // a=imageattr:97
+        '^imageattr:(\\d+|\\*)' +
+        // send [x=800,y=640,sar=1.1,q=0.6] [x=480,y=320]
+        '[\\s\\t]+(send|recv)[\\s\\t]+(\\*|\\[\\S+\\](?:[\\s\\t]+\\[\\S+\\])*)' +
+        // recv [x=330,y=250]
+        '(?:[\\s\\t]+(recv|send)[\\s\\t]+(\\*|\\[\\S+\\](?:[\\s\\t]+\\[\\S+\\])*))?'
+      ),
+      names: ['pt', 'dir1', 'attrs1', 'dir2', 'attrs2'],
+      format: function (o) {
+        return 'imageattr:%s %s %s' + (o.dir2 ? ' %s %s' : '');
+      }
+    },
+    {
+      // a=simulcast:send 1,2,3;~4,~5 recv 6;~7,~8
+      // a=simulcast:recv 1;4,5 send 6;7
+      name: 'simulcast',
+      reg: new RegExp(
+        // a=simulcast:
+        '^simulcast:' +
+        // send 1,2,3;~4,~5
+        '(send|recv) ([a-zA-Z0-9\\-_~;,]+)' +
+        // space + recv 6;~7,~8
+        '(?:\\s?(send|recv) ([a-zA-Z0-9\\-_~;,]+))?' +
+        // end
+        '$'
+      ),
+      names: ['dir1', 'list1', 'dir2', 'list2'],
+      format: function (o) {
+        return 'simulcast:%s %s' + (o.dir2 ? ' %s %s' : '');
+      }
+    },
+    {
+      // old simulcast draft 03 (implemented by Firefox)
+      //   https://tools.ietf.org/html/draft-ietf-mmusic-sdp-simulcast-03
+      // a=simulcast: recv pt=97;98 send pt=97
+      // a=simulcast: send rid=5;6;7 paused=6,7
+      name: 'simulcast_03',
+      reg: /^simulcast:[\s\t]+([\S+\s\t]+)$/,
+      names: ['value'],
+      format: 'simulcast: %s'
+    },
+    {
+      // a=framerate:25
+      // a=framerate:29.97
+      name: 'framerate',
+      reg: /^framerate:(\d+(?:$|\.\d+))/,
+      format: 'framerate:%s'
+    },
+    {
+      // RFC4570
+      // a=source-filter: incl IN IP4 239.5.2.31 10.1.15.5
+      name: 'sourceFilter',
+      reg: /^source-filter: *(excl|incl) (\S*) (IP4|IP6|\*) (\S*) (.*)/,
+      names: ['filterMode', 'netType', 'addressTypes', 'destAddress', 'srcList'],
+      format: 'source-filter: %s %s %s %s %s'
+    },
+    {
+      // a=bundle-only
+      name: 'bundleOnly',
+      reg: /^(bundle-only)/
+    },
+    {
+      // a=label:1
+      name: 'label',
+      reg: /^label:(.+)/,
+      format: 'label:%s'
+    },
+    {
+      // RFC version 26 for SCTP over DTLS
+      // https://tools.ietf.org/html/draft-ietf-mmusic-sctp-sdp-26#section-5
+      name: 'sctpPort',
+      reg: /^sctp-port:(\d+)$/,
+      format: 'sctp-port:%s'
+    },
+    {
+      // RFC version 26 for SCTP over DTLS
+      // https://tools.ietf.org/html/draft-ietf-mmusic-sctp-sdp-26#section-6
+      name: 'maxMessageSize',
+      reg: /^max-message-size:(\d+)$/,
+      format: 'max-message-size:%s'
+    },
+    {
+      // RFC7273
+      // a=ts-refclk:ptp=IEEE1588-2008:39-A7-94-FF-FE-07-CB-D0:37
+      push:'tsRefClocks',
+      reg: /^ts-refclk:([^\s=]*)(?:=(\S*))?/,
+      names: ['clksrc', 'clksrcExt'],
+      format: function (o) {
+        return 'ts-refclk:%s' + (o.clksrcExt != null ? '=%s' : '');
+      }
+    },
+    {
+      // RFC7273
+      // a=mediaclk:direct=963214424
+      name:'mediaClk',
+      reg: /^mediaclk:(?:id=(\S*))? *([^\s=]*)(?:=(\S*))?(?: *rate=(\d+)\/(\d+))?/,
+      names: ['id', 'mediaClockName', 'mediaClockValue', 'rateNumerator', 'rateDenominator'],
+      format: function (o) {
+        var str = 'mediaclk:';
+        str += (o.id != null ? 'id=%s %s' : '%v%s');
+        str += (o.mediaClockValue != null ? '=%s' : '');
+        str += (o.rateNumerator != null ? ' rate=%s' : '');
+        str += (o.rateDenominator != null ? '/%s' : '');
+        return str;
+      }
+    },
+    {
+      // a=keywds:keywords
+      name: 'keywords',
+      reg: /^keywds:(.+)$/,
+      format: 'keywds:%s'
+    },
+    {
+      // a=content:main
+      name: 'content',
+      reg: /^content:(.+)/,
+      format: 'content:%s'
+    },
+    // BFCP https://tools.ietf.org/html/rfc4583
+    {
+      // a=floorctrl:c-s
+      name: 'bfcpFloorCtrl',
+      reg: /^floorctrl:(c-only|s-only|c-s)/,
+      format: 'floorctrl:%s'
+    },
+    {
+      // a=confid:1
+      name: 'bfcpConfId',
+      reg: /^confid:(\d+)/,
+      format: 'confid:%s'
+    },
+    {
+      // a=userid:1
+      name: 'bfcpUserId',
+      reg: /^userid:(\d+)/,
+      format: 'userid:%s'
+    },
+    {
+      // a=floorid:1
+      name: 'bfcpFloorId',
+      reg: /^floorid:(.+) (?:m-stream|mstrm):(.+)/,
+      names: ['id', 'mStream'],
+      format: 'floorid:%s mstrm:%s'
+    },
+    {
+      // any a= that we don't understand is kept verbatim on media.invalid
+      push: 'invalid',
+      names: ['value']
+    }
+  ]
+};
+
+// set sensible defaults to avoid polluting the grammar with boring details
+Object.keys(grammar).forEach(function (key) {
+  var objs = grammar[key];
+  objs.forEach(function (obj) {
+    if (!obj.reg) {
+      obj.reg = /(.*)/;
+    }
+    if (!obj.format) {
+      obj.format = '%s';
+    }
+  });
+});
+
+},{}],44:[function(require,module,exports){
+var parser = require('./parser');
+var writer = require('./writer');
+
+exports.write = writer;
+exports.parse = parser.parse;
+exports.parseParams = parser.parseParams;
+exports.parseFmtpConfig = parser.parseFmtpConfig; // Alias of parseParams().
+exports.parsePayloads = parser.parsePayloads;
+exports.parseRemoteCandidates = parser.parseRemoteCandidates;
+exports.parseImageAttributes = parser.parseImageAttributes;
+exports.parseSimulcastStreamList = parser.parseSimulcastStreamList;
+
+},{"./parser":45,"./writer":46}],45:[function(require,module,exports){
+var toIntIfInt = function (v) {
+  return String(Number(v)) === v ? Number(v) : v;
+};
+
+var attachProperties = function (match, location, names, rawName) {
+  if (rawName && !names) {
+    location[rawName] = toIntIfInt(match[1]);
+  }
+  else {
+    for (var i = 0; i < names.length; i += 1) {
+      if (match[i+1] != null) {
+        location[names[i]] = toIntIfInt(match[i+1]);
+      }
+    }
+  }
+};
+
+var parseReg = function (obj, location, content) {
+  var needsBlank = obj.name && obj.names;
+  if (obj.push && !location[obj.push]) {
+    location[obj.push] = [];
+  }
+  else if (needsBlank && !location[obj.name]) {
+    location[obj.name] = {};
+  }
+  var keyLocation = obj.push ?
+    {} :  // blank object that will be pushed
+    needsBlank ? location[obj.name] : location; // otherwise, named location or root
+
+  attachProperties(content.match(obj.reg), keyLocation, obj.names, obj.name);
+
+  if (obj.push) {
+    location[obj.push].push(keyLocation);
+  }
+};
+
+var grammar = require('./grammar');
+var validLine = RegExp.prototype.test.bind(/^([a-z])=(.*)/);
+
+exports.parse = function (sdp) {
+  var session = {}
+    , media = []
+    , location = session; // points at where properties go under (one of the above)
+
+  // parse lines we understand
+  sdp.split(/(\r\n|\r|\n)/).filter(validLine).forEach(function (l) {
+    var type = l[0];
+    var content = l.slice(2);
+    if (type === 'm') {
+      media.push({rtp: [], fmtp: []});
+      location = media[media.length-1]; // point at latest media line
+    }
 
-                        if (list.length === 1) events[type] = list[0];
+    for (var j = 0; j < (grammar[type] || []).length; j += 1) {
+      var obj = grammar[type][j];
+      if (obj.reg.test(content)) {
+        return parseReg(obj, location, content);
+      }
+    }
+  });
+
+  session.media = media; // link it up
+  return session;
+};
+
+var paramReducer = function (acc, expr) {
+  var s = expr.split(/=(.+)/, 2);
+  if (s.length === 2) {
+    acc[s[0]] = toIntIfInt(s[1]);
+  } else if (s.length === 1 && expr.length > 1) {
+    acc[s[0]] = undefined;
+  }
+  return acc;
+};
+
+exports.parseParams = function (str) {
+  return str.split(/;\s?/).reduce(paramReducer, {});
+};
+
+// For backward compatibility - alias will be removed in 3.0.0
+exports.parseFmtpConfig = exports.parseParams;
+
+exports.parsePayloads = function (str) {
+  return str.toString().split(' ').map(Number);
+};
+
+exports.parseRemoteCandidates = function (str) {
+  var candidates = [];
+  var parts = str.split(' ').map(toIntIfInt);
+  for (var i = 0; i < parts.length; i += 3) {
+    candidates.push({
+      component: parts[i],
+      ip: parts[i + 1],
+      port: parts[i + 2]
+    });
+  }
+  return candidates;
+};
+
+exports.parseImageAttributes = function (str) {
+  return str.split(' ').map(function (item) {
+    return item.substring(1, item.length-1).split(',').reduce(paramReducer, {});
+  });
+};
+
+exports.parseSimulcastStreamList = function (str) {
+  return str.split(';').map(function (stream) {
+    return stream.split(',').map(function (format) {
+      var scid, paused = false;
+
+      if (format[0] !== '~') {
+        scid = toIntIfInt(format);
+      } else {
+        scid = toIntIfInt(format.substring(1, format.length));
+        paused = true;
+      }
+
+      return {
+        scid: scid,
+        paused: paused
+      };
+    });
+  });
+};
+
+},{"./grammar":43}],46:[function(require,module,exports){
+var grammar = require('./grammar');
+
+// customized util.format - discards excess arguments and can void middle ones
+var formatRegExp = /%[sdv%]/g;
+var format = function (formatStr) {
+  var i = 1;
+  var args = arguments;
+  var len = args.length;
+  return formatStr.replace(formatRegExp, function (x) {
+    if (i >= len) {
+      return x; // missing argument
+    }
+    var arg = args[i];
+    i += 1;
+    switch (x) {
+    case '%%':
+      return '%';
+    case '%s':
+      return String(arg);
+    case '%d':
+      return Number(arg);
+    case '%v':
+      return '';
+    }
+  });
+  // NB: we discard excess arguments - they are typically undefined from makeLine
+};
+
+var makeLine = function (type, obj, location) {
+  var str = obj.format instanceof Function ?
+    (obj.format(obj.push ? location : location[obj.name])) :
+    obj.format;
+
+  var args = [type + '=' + str];
+  if (obj.names) {
+    for (var i = 0; i < obj.names.length; i += 1) {
+      var n = obj.names[i];
+      if (obj.name) {
+        args.push(location[obj.name][n]);
+      }
+      else { // for mLine and push attributes
+        args.push(location[obj.names[i]]);
+      }
+    }
+  }
+  else {
+    args.push(location[obj.name]);
+  }
+  return format.apply(null, args);
+};
+
+// RFC specified order
+// TODO: extend this with all the rest
+var defaultOuterOrder = [
+  'v', 'o', 's', 'i',
+  'u', 'e', 'p', 'c',
+  'b', 't', 'r', 'z', 'a'
+];
+var defaultInnerOrder = ['i', 'c', 'b', 'a'];
+
+
+module.exports = function (session, opts) {
+  opts = opts || {};
+  // ensure certain properties exist
+  if (session.version == null) {
+    session.version = 0; // 'v=0' must be there (only defined version atm)
+  }
+  if (session.name == null) {
+    session.name = ' '; // 's= ' must be there if no meaningful name set
+  }
+  session.media.forEach(function (mLine) {
+    if (mLine.payloads == null) {
+      mLine.payloads = '';
+    }
+  });
+
+  var outerOrder = opts.outerOrder || defaultOuterOrder;
+  var innerOrder = opts.innerOrder || defaultInnerOrder;
+  var sdp = [];
+
+  // loop through outerOrder for matching properties on session
+  outerOrder.forEach(function (type) {
+    grammar[type].forEach(function (obj) {
+      if (obj.name in session && session[obj.name] != null) {
+        sdp.push(makeLine(type, obj, session));
+      }
+      else if (obj.push in session && session[obj.push] != null) {
+        session[obj.push].forEach(function (el) {
+          sdp.push(makeLine(type, obj, el));
+        });
+      }
+    });
+  });
+
+  // then for each media line, follow the innerOrder
+  session.media.forEach(function (mLine) {
+    sdp.push(makeLine('m', grammar.m[0], mLine));
+
+    innerOrder.forEach(function (type) {
+      grammar[type].forEach(function (obj) {
+        if (obj.name in mLine && mLine[obj.name] != null) {
+          sdp.push(makeLine(type, obj, mLine));
+        }
+        else if (obj.push in mLine && mLine[obj.push] != null) {
+          mLine[obj.push].forEach(function (el) {
+            sdp.push(makeLine(type, obj, el));
+          });
+        }
+      });
+    });
+  });
+
+  return sdp.join('\r\n') + '\r\n';
+};
+
+},{"./grammar":43}],47:[function(require,module,exports){
+// Copyright Joyent, Inc. and other Node contributors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to permit
+// persons to whom the Software is furnished to do so, subject to the
+// following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+// USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+'use strict';
+
+var R = typeof Reflect === 'object' ? Reflect : null
+var ReflectApply = R && typeof R.apply === 'function'
+  ? R.apply
+  : function ReflectApply(target, receiver, args) {
+    return Function.prototype.apply.call(target, receiver, args);
+  }
+
+var ReflectOwnKeys
+if (R && typeof R.ownKeys === 'function') {
+  ReflectOwnKeys = R.ownKeys
+} else if (Object.getOwnPropertySymbols) {
+  ReflectOwnKeys = function ReflectOwnKeys(target) {
+    return Object.getOwnPropertyNames(target)
+      .concat(Object.getOwnPropertySymbols(target));
+  };
+} else {
+  ReflectOwnKeys = function ReflectOwnKeys(target) {
+    return Object.getOwnPropertyNames(target);
+  };
+}
+
+function ProcessEmitWarning(warning) {
+  if (console && console.warn) console.warn(warning);
+}
+
+var NumberIsNaN = Number.isNaN || function NumberIsNaN(value) {
+  return value !== value;
+}
+
+function EventEmitter() {
+  EventEmitter.init.call(this);
+}
+module.exports = EventEmitter;
+module.exports.once = once;
+
+// Backwards-compat with node 0.10.x
+EventEmitter.EventEmitter = EventEmitter;
+
+EventEmitter.prototype._events = undefined;
+EventEmitter.prototype._eventsCount = 0;
+EventEmitter.prototype._maxListeners = undefined;
+
+// By default EventEmitters will print a warning if more than 10 listeners are
+// added to it. This is a useful default which helps finding memory leaks.
+var defaultMaxListeners = 10;
+
+function checkListener(listener) {
+  if (typeof listener !== 'function') {
+    throw new TypeError('The "listener" argument must be of type Function. Received type ' + typeof listener);
+  }
+}
+
+Object.defineProperty(EventEmitter, 'defaultMaxListeners', {
+  enumerable: true,
+  get: function() {
+    return defaultMaxListeners;
+  },
+  set: function(arg) {
+    if (typeof arg !== 'number' || arg < 0 || NumberIsNaN(arg)) {
+      throw new RangeError('The value of "defaultMaxListeners" is out of range. It must be a non-negative number. Received ' + arg + '.');
+    }
+    defaultMaxListeners = arg;
+  }
+});
+
+EventEmitter.init = function() {
+
+  if (this._events === undefined ||
+      this._events === Object.getPrototypeOf(this)._events) {
+    this._events = Object.create(null);
+    this._eventsCount = 0;
+  }
+
+  this._maxListeners = this._maxListeners || undefined;
+};
+
+// Obviously not all Emitters should be limited to 10. This function allows
+// that to be increased. Set to zero for unlimited.
+EventEmitter.prototype.setMaxListeners = function setMaxListeners(n) {
+  if (typeof n !== 'number' || n < 0 || NumberIsNaN(n)) {
+    throw new RangeError('The value of "n" is out of range. It must be a non-negative number. Received ' + n + '.');
+  }
+  this._maxListeners = n;
+  return this;
+};
+
+function _getMaxListeners(that) {
+  if (that._maxListeners === undefined)
+    return EventEmitter.defaultMaxListeners;
+  return that._maxListeners;
+}
+
+EventEmitter.prototype.getMaxListeners = function getMaxListeners() {
+  return _getMaxListeners(this);
+};
+
+EventEmitter.prototype.emit = function emit(type) {
+  var args = [];
+  for (var i = 1; i < arguments.length; i++) args.push(arguments[i]);
+  var doError = (type === 'error');
+
+  var events = this._events;
+  if (events !== undefined)
+    doError = (doError && events.error === undefined);
+  else if (!doError)
+    return false;
+
+  // If there is no 'error' event listener then throw.
+  if (doError) {
+    var er;
+    if (args.length > 0)
+      er = args[0];
+    if (er instanceof Error) {
+      // Note: The comments on the `throw` lines are intentional, they show
+      // up in Node's output if this results in an unhandled exception.
+      throw er; // Unhandled 'error' event
+    }
+    // At least give some kind of context to the user
+    var err = new Error('Unhandled error.' + (er ? ' (' + er.message + ')' : ''));
+    err.context = er;
+    throw err; // Unhandled 'error' event
+  }
+
+  var handler = events[type];
+
+  if (handler === undefined)
+    return false;
+
+  if (typeof handler === 'function') {
+    ReflectApply(handler, this, args);
+  } else {
+    var len = handler.length;
+    var listeners = arrayClone(handler, len);
+    for (var i = 0; i < len; ++i)
+      ReflectApply(listeners[i], this, args);
+  }
+
+  return true;
+};
+
+function _addListener(target, type, listener, prepend) {
+  var m;
+  var events;
+  var existing;
+
+  checkListener(listener);
+
+  events = target._events;
+  if (events === undefined) {
+    events = target._events = Object.create(null);
+    target._eventsCount = 0;
+  } else {
+    // To avoid recursion in the case that type === "newListener"! Before
+    // adding it to the listeners, first emit "newListener".
+    if (events.newListener !== undefined) {
+      target.emit('newListener', type,
+                  listener.listener ? listener.listener : listener);
+
+      // Re-assign `events` because a newListener handler could have caused the
+      // this._events to be assigned to a new object
+      events = target._events;
+    }
+    existing = events[type];
+  }
+
+  if (existing === undefined) {
+    // Optimize the case of one listener. Don't need the extra array object.
+    existing = events[type] = listener;
+    ++target._eventsCount;
+  } else {
+    if (typeof existing === 'function') {
+      // Adding the second element, need to change to array.
+      existing = events[type] =
+        prepend ? [listener, existing] : [existing, listener];
+      // If we've already got an array, just append.
+    } else if (prepend) {
+      existing.unshift(listener);
+    } else {
+      existing.push(listener);
+    }
 
-                        if (events.removeListener) this.emit('removeListener', type, originalListener || listener);
-                    }
+    // Check for listener leak
+    m = _getMaxListeners(target);
+    if (m > 0 && existing.length > m && !existing.warned) {
+      existing.warned = true;
+      // No error code for this since it is a Warning
+      // eslint-disable-next-line no-restricted-syntax
+      var w = new Error('Possible EventEmitter memory leak detected. ' +
+                          existing.length + ' ' + String(type) + ' listeners ' +
+                          'added. Use emitter.setMaxListeners() to ' +
+                          'increase limit');
+      w.name = 'MaxListenersExceededWarning';
+      w.emitter = target;
+      w.type = type;
+      w.count = existing.length;
+      ProcessEmitWarning(w);
+    }
+  }
+
+  return target;
+}
+
+EventEmitter.prototype.addListener = function addListener(type, listener) {
+  return _addListener(this, type, listener, false);
+};
+
+EventEmitter.prototype.on = EventEmitter.prototype.addListener;
+
+EventEmitter.prototype.prependListener =
+    function prependListener(type, listener) {
+      return _addListener(this, type, listener, true);
+    };
+
+function onceWrapper() {
+  if (!this.fired) {
+    this.target.removeListener(this.type, this.wrapFn);
+    this.fired = true;
+    if (arguments.length === 0)
+      return this.listener.call(this.target);
+    return this.listener.apply(this.target, arguments);
+  }
+}
+
+function _onceWrap(target, type, listener) {
+  var state = { fired: false, wrapFn: undefined, target: target, type: type, listener: listener };
+  var wrapped = onceWrapper.bind(state);
+  wrapped.listener = listener;
+  state.wrapFn = wrapped;
+  return wrapped;
+}
+
+EventEmitter.prototype.once = function once(type, listener) {
+  checkListener(listener);
+  this.on(type, _onceWrap(this, type, listener));
+  return this;
+};
+
+EventEmitter.prototype.prependOnceListener =
+    function prependOnceListener(type, listener) {
+      checkListener(listener);
+      this.prependListener(type, _onceWrap(this, type, listener));
+      return this;
+    };
+
+// Emits a 'removeListener' event if and only if the listener was removed.
+EventEmitter.prototype.removeListener =
+    function removeListener(type, listener) {
+      var list, events, position, i, originalListener;
+
+      checkListener(listener);
+
+      events = this._events;
+      if (events === undefined)
+        return this;
+
+      list = events[type];
+      if (list === undefined)
+        return this;
+
+      if (list === listener || list.listener === listener) {
+        if (--this._eventsCount === 0)
+          this._events = Object.create(null);
+        else {
+          delete events[type];
+          if (events.removeListener)
+            this.emit('removeListener', type, list.listener || listener);
+        }
+      } else if (typeof list !== 'function') {
+        position = -1;
+
+        for (i = list.length - 1; i >= 0; i--) {
+          if (list[i] === listener || list[i].listener === listener) {
+            originalListener = list[i].listener;
+            position = i;
+            break;
+          }
+        }
 
-                    return this;
-                };
+        if (position < 0)
+          return this;
 
-                EventEmitter.prototype.removeAllListeners = function removeAllListeners(type) {
-                    var listeners, events, i;
+        if (position === 0)
+          list.shift();
+        else {
+          spliceOne(list, position);
+        }
 
-                    events = this._events;
-                    if (!events) return this;
+        if (list.length === 1)
+          events[type] = list[0];
 
-                    // not listening for removeListener, no need to emit
-                    if (!events.removeListener) {
-                        if (arguments.length === 0) {
-                            this._events = objectCreate(null);
-                            this._eventsCount = 0;
-                        } else if (events[type]) {
-                            if (--this._eventsCount === 0) this._events = objectCreate(null);
-                            else delete events[type];
-                        }
-                        return this;
-                    }
+        if (events.removeListener !== undefined)
+          this.emit('removeListener', type, originalListener || listener);
+      }
 
-                    // emit removeListener for all listeners on all events
-                    if (arguments.length === 0) {
-                        var keys = objectKeys(events);
-                        var key;
-                        for (i = 0; i < keys.length; ++i) {
-                            key = keys[i];
-                            if (key === 'removeListener') continue;
-                            this.removeAllListeners(key);
-                        }
-                        this.removeAllListeners('removeListener');
-                        this._events = objectCreate(null);
-                        this._eventsCount = 0;
-                        return this;
-                    }
+      return this;
+    };
 
-                    listeners = events[type];
+EventEmitter.prototype.off = EventEmitter.prototype.removeListener;
 
-                    if (typeof listeners === 'function') {
-                        this.removeListener(type, listeners);
-                    } else if (listeners) {
-                        // LIFO order
-                        for (i = listeners.length - 1; i >= 0; i--) {
-                            this.removeListener(type, listeners[i]);
-                        }
-                    }
+EventEmitter.prototype.removeAllListeners =
+    function removeAllListeners(type) {
+      var listeners, events, i;
 
-                    return this;
-                };
+      events = this._events;
+      if (events === undefined)
+        return this;
 
-                function _listeners(target, type, unwrap) {
-                    var events = target._events;
+      // not listening for removeListener, no need to emit
+      if (events.removeListener === undefined) {
+        if (arguments.length === 0) {
+          this._events = Object.create(null);
+          this._eventsCount = 0;
+        } else if (events[type] !== undefined) {
+          if (--this._eventsCount === 0)
+            this._events = Object.create(null);
+          else
+            delete events[type];
+        }
+        return this;
+      }
+
+      // emit removeListener for all listeners on all events
+      if (arguments.length === 0) {
+        var keys = Object.keys(events);
+        var key;
+        for (i = 0; i < keys.length; ++i) {
+          key = keys[i];
+          if (key === 'removeListener') continue;
+          this.removeAllListeners(key);
+        }
+        this.removeAllListeners('removeListener');
+        this._events = Object.create(null);
+        this._eventsCount = 0;
+        return this;
+      }
+
+      listeners = events[type];
+
+      if (typeof listeners === 'function') {
+        this.removeListener(type, listeners);
+      } else if (listeners !== undefined) {
+        // LIFO order
+        for (i = listeners.length - 1; i >= 0; i--) {
+          this.removeListener(type, listeners[i]);
+        }
+      }
 
-                    if (!events) return [];
+      return this;
+    };
 
-                    var evlistener = events[type];
-                    if (!evlistener) return [];
+function _listeners(target, type, unwrap) {
+  var events = target._events;
 
-                    if (typeof evlistener === 'function')
-                        return unwrap ? [evlistener.listener || evlistener] : [evlistener];
+  if (events === undefined)
+    return [];
 
-                    return unwrap ? unwrapListeners(evlistener) : arrayClone(evlistener, evlistener.length);
-                }
+  var evlistener = events[type];
+  if (evlistener === undefined)
+    return [];
 
-                EventEmitter.prototype.listeners = function listeners(type) {
-                    return _listeners(this, type, true);
-                };
+  if (typeof evlistener === 'function')
+    return unwrap ? [evlistener.listener || evlistener] : [evlistener];
 
-                EventEmitter.prototype.rawListeners = function rawListeners(type) {
-                    return _listeners(this, type, false);
-                };
+  return unwrap ?
+    unwrapListeners(evlistener) : arrayClone(evlistener, evlistener.length);
+}
 
-                EventEmitter.listenerCount = function (emitter, type) {
-                    if (typeof emitter.listenerCount === 'function') {
-                        return emitter.listenerCount(type);
-                    } else {
-                        return listenerCount.call(emitter, type);
-                    }
-                };
+EventEmitter.prototype.listeners = function listeners(type) {
+  return _listeners(this, type, true);
+};
 
-                EventEmitter.prototype.listenerCount = listenerCount;
-                function listenerCount(type) {
-                    var events = this._events;
+EventEmitter.prototype.rawListeners = function rawListeners(type) {
+  return _listeners(this, type, false);
+};
 
-                    if (events) {
-                        var evlistener = events[type];
+EventEmitter.listenerCount = function(emitter, type) {
+  if (typeof emitter.listenerCount === 'function') {
+    return emitter.listenerCount(type);
+  } else {
+    return listenerCount.call(emitter, type);
+  }
+};
 
-                        if (typeof evlistener === 'function') {
-                            return 1;
-                        } else if (evlistener) {
-                            return evlistener.length;
-                        }
-                    }
+EventEmitter.prototype.listenerCount = listenerCount;
+function listenerCount(type) {
+  var events = this._events;
 
-                    return 0;
-                }
+  if (events !== undefined) {
+    var evlistener = events[type];
 
-                EventEmitter.prototype.eventNames = function eventNames() {
-                    return this._eventsCount > 0 ? Reflect.ownKeys(this._events) : [];
-                };
+    if (typeof evlistener === 'function') {
+      return 1;
+    } else if (evlistener !== undefined) {
+      return evlistener.length;
+    }
+  }
+
+  return 0;
+}
+
+EventEmitter.prototype.eventNames = function eventNames() {
+  return this._eventsCount > 0 ? ReflectOwnKeys(this._events) : [];
+};
+
+function arrayClone(arr, n) {
+  var copy = new Array(n);
+  for (var i = 0; i < n; ++i)
+    copy[i] = arr[i];
+  return copy;
+}
+
+function spliceOne(list, index) {
+  for (; index + 1 < list.length; index++)
+    list[index] = list[index + 1];
+  list.pop();
+}
+
+function unwrapListeners(arr) {
+  var ret = new Array(arr.length);
+  for (var i = 0; i < ret.length; ++i) {
+    ret[i] = arr[i].listener || arr[i];
+  }
+  return ret;
+}
+
+function once(emitter, name) {
+  return new Promise(function (resolve, reject) {
+    function errorListener(err) {
+      emitter.removeListener(name, resolver);
+      reject(err);
+    }
 
-                // About 1.5x faster than the two-arg version of Array#splice().
-                function spliceOne(list, index) {
-                    for (var i = index, k = i + 1, n = list.length; k < n; i += 1, k += 1) list[i] = list[k];
-                    list.pop();
-                }
+    function resolver() {
+      if (typeof emitter.removeListener === 'function') {
+        emitter.removeListener('error', errorListener);
+      }
+      resolve([].slice.call(arguments));
+    };
 
-                function arrayClone(arr, n) {
-                    var copy = new Array(n);
-                    for (var i = 0; i < n; ++i) copy[i] = arr[i];
-                    return copy;
-                }
+    eventTargetAgnosticAddListener(emitter, name, resolver, { once: true });
+    if (name !== 'error') {
+      addErrorHandlerIfEventEmitter(emitter, errorListener, { once: true });
+    }
+  });
+}
+
+function addErrorHandlerIfEventEmitter(emitter, handler, flags) {
+  if (typeof emitter.on === 'function') {
+    eventTargetAgnosticAddListener(emitter, 'error', handler, flags);
+  }
+}
+
+function eventTargetAgnosticAddListener(emitter, name, listener, flags) {
+  if (typeof emitter.on === 'function') {
+    if (flags.once) {
+      emitter.once(name, listener);
+    } else {
+      emitter.on(name, listener);
+    }
+  } else if (typeof emitter.addEventListener === 'function') {
+    // EventTarget does not have `error` event semantics like Node
+    // EventEmitters, we do not listen for `error` events here.
+    emitter.addEventListener(name, function wrapListener(arg) {
+      // IE does not have builtin `{ once: true }` support so we
+      // have to do it manually.
+      if (flags.once) {
+        emitter.removeEventListener(name, wrapListener);
+      }
+      listener(arg);
+    });
+  } else {
+    throw new TypeError('The "emitter" argument must be of type EventEmitter. Received type ' + typeof emitter);
+  }
+}
+
+},{}],48:[function(require,module,exports){
+// shim for using process in browser
+var process = module.exports = {};
+
+// cached from whatever global is present so that test runners that stub it
+// don't break things.  But we need to wrap it in a try catch in case it is
+// wrapped in strict mode code which doesn't define any globals.  It's inside a
+// function because try/catches deoptimize in certain engines.
+
+var cachedSetTimeout;
+var cachedClearTimeout;
+
+function defaultSetTimout() {
+    throw new Error('setTimeout has not been defined');
+}
+function defaultClearTimeout () {
+    throw new Error('clearTimeout has not been defined');
+}
+(function () {
+    try {
+        if (typeof setTimeout === 'function') {
+            cachedSetTimeout = setTimeout;
+        } else {
+            cachedSetTimeout = defaultSetTimout;
+        }
+    } catch (e) {
+        cachedSetTimeout = defaultSetTimout;
+    }
+    try {
+        if (typeof clearTimeout === 'function') {
+            cachedClearTimeout = clearTimeout;
+        } else {
+            cachedClearTimeout = defaultClearTimeout;
+        }
+    } catch (e) {
+        cachedClearTimeout = defaultClearTimeout;
+    }
+} ())
+function runTimeout(fun) {
+    if (cachedSetTimeout === setTimeout) {
+        //normal enviroments in sane situations
+        return setTimeout(fun, 0);
+    }
+    // if setTimeout wasn't available but was latter defined
+    if ((cachedSetTimeout === defaultSetTimout || !cachedSetTimeout) && setTimeout) {
+        cachedSetTimeout = setTimeout;
+        return setTimeout(fun, 0);
+    }
+    try {
+        // when when somebody has screwed with setTimeout but no I.E. maddness
+        return cachedSetTimeout(fun, 0);
+    } catch(e){
+        try {
+            // When we are in I.E. but the script has been evaled so I.E. doesn't trust the global object when called normally
+            return cachedSetTimeout.call(null, fun, 0);
+        } catch(e){
+            // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error
+            return cachedSetTimeout.call(this, fun, 0);
+        }
+    }
 
-                function unwrapListeners(arr) {
-                    var ret = new Array(arr.length);
-                    for (var i = 0; i < ret.length; ++i) {
-                        ret[i] = arr[i].listener || arr[i];
-                    }
-                    return ret;
-                }
 
-                function objectCreatePolyfill(proto) {
-                    var F = function () {};
-                    F.prototype = proto;
-                    return new F();
-                }
-                function objectKeysPolyfill(obj) {
-                    var keys = [];
-                    for (var k in obj)
-                        if (Object.prototype.hasOwnProperty.call(obj, k)) {
-                            keys.push(k);
-                        }
-                    return k;
-                }
-                function functionBindPolyfill(context) {
-                    var fn = this;
-                    return function () {
-                        return fn.apply(context, arguments);
-                    };
-                }
-            },
-            {},
-        ],
-        46: [
-            function (require, module, exports) {
-                // shim for using process in browser
-                var process = (module.exports = {});
-
-                // cached from whatever global is present so that test runners that stub it
-                // don't break things.  But we need to wrap it in a try catch in case it is
-                // wrapped in strict mode code which doesn't define any globals.  It's inside a
-                // function because try/catches deoptimize in certain engines.
-
-                var cachedSetTimeout;
-                var cachedClearTimeout;
-
-                function defaultSetTimout() {
-                    throw new Error('setTimeout has not been defined');
-                }
-                function defaultClearTimeout() {
-                    throw new Error('clearTimeout has not been defined');
-                }
-                (function () {
-                    try {
-                        if (typeof setTimeout === 'function') {
-                            cachedSetTimeout = setTimeout;
-                        } else {
-                            cachedSetTimeout = defaultSetTimout;
-                        }
-                    } catch (e) {
-                        cachedSetTimeout = defaultSetTimout;
-                    }
-                    try {
-                        if (typeof clearTimeout === 'function') {
-                            cachedClearTimeout = clearTimeout;
-                        } else {
-                            cachedClearTimeout = defaultClearTimeout;
-                        }
-                    } catch (e) {
-                        cachedClearTimeout = defaultClearTimeout;
-                    }
-                })();
-                function runTimeout(fun) {
-                    if (cachedSetTimeout === setTimeout) {
-                        //normal enviroments in sane situations
-                        return setTimeout(fun, 0);
-                    }
-                    // if setTimeout wasn't available but was latter defined
-                    if ((cachedSetTimeout === defaultSetTimout || !cachedSetTimeout) && setTimeout) {
-                        cachedSetTimeout = setTimeout;
-                        return setTimeout(fun, 0);
-                    }
-                    try {
-                        // when when somebody has screwed with setTimeout but no I.E. maddness
-                        return cachedSetTimeout(fun, 0);
-                    } catch (e) {
-                        try {
-                            // When we are in I.E. but the script has been evaled so I.E. doesn't trust the global object when called normally
-                            return cachedSetTimeout.call(null, fun, 0);
-                        } catch (e) {
-                            // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error
-                            return cachedSetTimeout.call(this, fun, 0);
-                        }
-                    }
-                }
-                function runClearTimeout(marker) {
-                    if (cachedClearTimeout === clearTimeout) {
-                        //normal enviroments in sane situations
-                        return clearTimeout(marker);
-                    }
-                    // if clearTimeout wasn't available but was latter defined
-                    if ((cachedClearTimeout === defaultClearTimeout || !cachedClearTimeout) && clearTimeout) {
-                        cachedClearTimeout = clearTimeout;
-                        return clearTimeout(marker);
-                    }
-                    try {
-                        // when when somebody has screwed with setTimeout but no I.E. maddness
-                        return cachedClearTimeout(marker);
-                    } catch (e) {
-                        try {
-                            // When we are in I.E. but the script has been evaled so I.E. doesn't  trust the global object when called normally
-                            return cachedClearTimeout.call(null, marker);
-                        } catch (e) {
-                            // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error.
-                            // Some versions of I.E. have different rules for clearTimeout vs setTimeout
-                            return cachedClearTimeout.call(this, marker);
-                        }
-                    }
-                }
-                var queue = [];
-                var draining = false;
-                var currentQueue;
-                var queueIndex = -1;
-
-                function cleanUpNextTick() {
-                    if (!draining || !currentQueue) {
-                        return;
-                    }
-                    draining = false;
-                    if (currentQueue.length) {
-                        queue = currentQueue.concat(queue);
-                    } else {
-                        queueIndex = -1;
-                    }
-                    if (queue.length) {
-                        drainQueue();
-                    }
-                }
+}
+function runClearTimeout(marker) {
+    if (cachedClearTimeout === clearTimeout) {
+        //normal enviroments in sane situations
+        return clearTimeout(marker);
+    }
+    // if clearTimeout wasn't available but was latter defined
+    if ((cachedClearTimeout === defaultClearTimeout || !cachedClearTimeout) && clearTimeout) {
+        cachedClearTimeout = clearTimeout;
+        return clearTimeout(marker);
+    }
+    try {
+        // when when somebody has screwed with setTimeout but no I.E. maddness
+        return cachedClearTimeout(marker);
+    } catch (e){
+        try {
+            // When we are in I.E. but the script has been evaled so I.E. doesn't  trust the global object when called normally
+            return cachedClearTimeout.call(null, marker);
+        } catch (e){
+            // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error.
+            // Some versions of I.E. have different rules for clearTimeout vs setTimeout
+            return cachedClearTimeout.call(this, marker);
+        }
+    }
 
-                function drainQueue() {
-                    if (draining) {
-                        return;
-                    }
-                    var timeout = runTimeout(cleanUpNextTick);
-                    draining = true;
-
-                    var len = queue.length;
-                    while (len) {
-                        currentQueue = queue;
-                        queue = [];
-                        while (++queueIndex < len) {
-                            if (currentQueue) {
-                                currentQueue[queueIndex].run();
-                            }
-                        }
-                        queueIndex = -1;
-                        len = queue.length;
-                    }
-                    currentQueue = null;
-                    draining = false;
-                    runClearTimeout(timeout);
-                }
 
-                process.nextTick = function (fun) {
-                    var args = new Array(arguments.length - 1);
-                    if (arguments.length > 1) {
-                        for (var i = 1; i < arguments.length; i++) {
-                            args[i - 1] = arguments[i];
-                        }
-                    }
-                    queue.push(new Item(fun, args));
-                    if (queue.length === 1 && !draining) {
-                        runTimeout(drainQueue);
-                    }
-                };
 
-                // v8 likes predictible objects
-                function Item(fun, array) {
-                    this.fun = fun;
-                    this.array = array;
-                }
-                Item.prototype.run = function () {
-                    this.fun.apply(null, this.array);
-                };
-                process.title = 'browser';
-                process.browser = true;
-                process.env = {};
-                process.argv = [];
-                process.version = ''; // empty string to avoid regexp issues
-                process.versions = {};
-
-                function noop() {}
-
-                process.on = noop;
-                process.addListener = noop;
-                process.once = noop;
-                process.off = noop;
-                process.removeListener = noop;
-                process.removeAllListeners = noop;
-                process.emit = noop;
-                process.prependListener = noop;
-                process.prependOnceListener = noop;
-
-                process.listeners = function (name) {
-                    return [];
-                };
+}
+var queue = [];
+var draining = false;
+var currentQueue;
+var queueIndex = -1;
 
-                process.binding = function (name) {
-                    throw new Error('process.binding is not supported');
-                };
+function cleanUpNextTick() {
+    if (!draining || !currentQueue) {
+        return;
+    }
+    draining = false;
+    if (currentQueue.length) {
+        queue = currentQueue.concat(queue);
+    } else {
+        queueIndex = -1;
+    }
+    if (queue.length) {
+        drainQueue();
+    }
+}
 
-                process.cwd = function () {
-                    return '/';
-                };
-                process.chdir = function (dir) {
-                    throw new Error('process.chdir is not supported');
-                };
-                process.umask = function () {
-                    return 0;
-                };
-            },
-            {},
-        ],
-    },
-    {},
-    [44],
-);
+function drainQueue() {
+    if (draining) {
+        return;
+    }
+    var timeout = runTimeout(cleanUpNextTick);
+    draining = true;
+
+    var len = queue.length;
+    while(len) {
+        currentQueue = queue;
+        queue = [];
+        while (++queueIndex < len) {
+            if (currentQueue) {
+                currentQueue[queueIndex].run();
+            }
+        }
+        queueIndex = -1;
+        len = queue.length;
+    }
+    currentQueue = null;
+    draining = false;
+    runClearTimeout(timeout);
+}
+
+process.nextTick = function (fun) {
+    var args = new Array(arguments.length - 1);
+    if (arguments.length > 1) {
+        for (var i = 1; i < arguments.length; i++) {
+            args[i - 1] = arguments[i];
+        }
+    }
+    queue.push(new Item(fun, args));
+    if (queue.length === 1 && !draining) {
+        runTimeout(drainQueue);
+    }
+};
+
+// v8 likes predictible objects
+function Item(fun, array) {
+    this.fun = fun;
+    this.array = array;
+}
+Item.prototype.run = function () {
+    this.fun.apply(null, this.array);
+};
+process.title = 'browser';
+process.browser = true;
+process.env = {};
+process.argv = [];
+process.version = ''; // empty string to avoid regexp issues
+process.versions = {};
+
+function noop() {}
+
+process.on = noop;
+process.addListener = noop;
+process.once = noop;
+process.off = noop;
+process.removeListener = noop;
+process.removeAllListeners = noop;
+process.emit = noop;
+process.prependListener = noop;
+process.prependOnceListener = noop;
+
+process.listeners = function (name) { return [] }
+
+process.binding = function (name) {
+    throw new Error('process.binding is not supported');
+};
+
+process.cwd = function () { return '/' };
+process.chdir = function (dir) {
+    throw new Error('process.chdir is not supported');
+};
+process.umask = function() { return 0; };
+
+},{}]},{},[1]);