-
Notifications
You must be signed in to change notification settings - Fork 336
/
audio_visualizer_single_page_version.html
300 lines (299 loc) · 15.4 KB
/
audio_visualizer_single_page_version.html
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
<!DOCTYPE html>
<html>
<head>
<meta name="description" content="HTML5 Audio Spectrum Visualizer">
<title>HTML5 Audio API showcase | Audio visualizer</title>
<style type="text/css">
html, body {
margin: 0;
font-family: arial, "Microsoft YaHei";
background-color: #272822;
color: #FEFEFE;
}
#fileWrapper{
transition:all 0.5s ease;
}
#fileWrapper:hover{
opacity: 1!important;
}
#visualizer_wrapper{
text-align: center;
}
footer{
position: fixed;
bottom: 2px;
color:#aaa;
}
</style>
</head>
<body>
<div id="wrapper">
<div id="fileWrapper" class="file_wrapper">
<div id="info">
HTML5 Audio API showcase | An Audio Viusalizer
</div>
<label for="uploadedFile">Drag&drop or select a file to play:</label>
<input type="file" id="uploadedFile"></input>
</div>
<div id="visualizer_wrapper">
<canvas id='canvas' width="800" height="350"></canvas>
</div>
</div>
<footer>
<small>Star me on <a href="https://github.com/Wayou/HTML5_Audio_Visualizer" target="_blank">GitHub</a></small>
</footer>
<script type="text/javascript">
/*
* An audio spectrum visualizer built with HTML5 Audio API
* Author:Wayou
* License: MIT
* Feb 15, 2014
*/
window.onload = function() {
new Visualizer().ini();
};
var Visualizer = function() {
this.file = null, //the current file
this.fileName = null, //the current file name
this.audioContext = null,
this.source = null, //the audio source
this.info = document.getElementById('info').innerHTML, //this used to upgrade the UI information
this.infoUpdateId = null, //to sotore the setTimeout ID and clear the interval
this.animationId = null,
this.status = 0, //flag for sound is playing 1 or stopped 0
this.forceStop = false,
this.allCapsReachBottom = false
};
Visualizer.prototype = {
ini: function() {
this._prepareAPI();
this._addEventListner();
},
_prepareAPI: function() {
//fix browser vender for AudioContext and requestAnimationFrame
window.AudioContext = window.AudioContext || window.webkitAudioContext || window.mozAudioContext || window.msAudioContext;
window.requestAnimationFrame = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.msRequestAnimationFrame;
window.cancelAnimationFrame = window.cancelAnimationFrame || window.webkitCancelAnimationFrame || window.mozCancelAnimationFrame || window.msCancelAnimationFrame;
try {
this.audioContext = new AudioContext();
} catch (e) {
this._updateInfo('!Your browser does not support AudioContext', false);
console.log(e);
}
},
_addEventListner: function() {
var that = this,
audioInput = document.getElementById('uploadedFile'),
dropContainer = document.getElementsByTagName("canvas")[0];
//listen the file upload
audioInput.onchange = function() {
if (that.audioContext===null) {return;};
//the if statement fixes the file selction cancle, because the onchange will trigger even the file selection been canceled
if (audioInput.files.length !== 0) {
//only process the first file
that.file = audioInput.files[0];
that.fileName = that.file.name;
if (that.status === 1) {
//the sound is still playing but we upload another file, so set the forceStop flag to true
that.forceStop = true;
};
document.getElementById('fileWrapper').style.opacity = 1;
that._updateInfo('Uploading', true);
//once the file is ready,start the visualizer
that._start();
};
};
//listen the drag & drop
dropContainer.addEventListener("dragenter", function() {
document.getElementById('fileWrapper').style.opacity = 1;
that._updateInfo('Drop it on the page', true);
}, false);
dropContainer.addEventListener("dragover", function(e) {
e.stopPropagation();
e.preventDefault();
//set the drop mode
e.dataTransfer.dropEffect = 'copy';
}, false);
dropContainer.addEventListener("dragleave", function() {
document.getElementById('fileWrapper').style.opacity = 0.2;
that._updateInfo(that.info, false);
}, false);
dropContainer.addEventListener("drop", function(e) {
e.stopPropagation();
e.preventDefault();
if (that.audioContext===null) {return;};
document.getElementById('fileWrapper').style.opacity = 1;
that._updateInfo('Uploading', true);
//get the dropped file
that.file = e.dataTransfer.files[0];
if (that.status === 1) {
document.getElementById('fileWrapper').style.opacity = 1;
that.forceStop = true;
};
that.fileName = that.file.name;
//once the file is ready,start the visualizer
that._start();
}, false);
},
_start: function() {
//read and decode the file into audio array buffer
var that = this,
file = this.file,
fr = new FileReader();
fr.onload = function(e) {
var fileResult = e.target.result;
var audioContext = that.audioContext;
if (audioContext === null) {
return;
};
that._updateInfo('Decoding the audio', true);
audioContext.decodeAudioData(fileResult, function(buffer) {
that._updateInfo('Decode succussfully,start the visualizer', true);
that._visualize(audioContext, buffer);
}, function(e) {
that._updateInfo('!Fail to decode the file', false);
console.log(e);
});
};
fr.onerror = function(e) {
that._updateInfo('!Fail to read the file', false);
console.log(e);
};
//assign the file to the reader
this._updateInfo('Starting read the file', true);
fr.readAsArrayBuffer(file);
},
_visualize: function(audioContext, buffer) {
var audioBufferSouceNode = audioContext.createBufferSource(),
analyser = audioContext.createAnalyser(),
that = this;
//connect the source to the analyser
audioBufferSouceNode.connect(analyser);
//connect the analyser to the destination(the speaker), or we won't hear the sound
analyser.connect(audioContext.destination);
//then assign the buffer to the buffer source node
audioBufferSouceNode.buffer = buffer;
//play the source
if (!audioBufferSouceNode.start) {
audioBufferSouceNode.start = audioBufferSouceNode.noteOn //in old browsers use noteOn method
audioBufferSouceNode.stop = audioBufferSouceNode.noteOff //in old browsers use noteOn method
};
//stop the previous sound if any
if (this.animationId !== null) {
cancelAnimationFrame(this.animationId);
}
if (this.source !== null) {
this.source.stop(0);
}
audioBufferSouceNode.start(0);
this.status = 1;
this.source = audioBufferSouceNode;
audioBufferSouceNode.onended = function() {
that._audioEnd(that);
};
this._updateInfo('Playing ' + this.fileName, false);
this.info = 'Playing ' + this.fileName;
document.getElementById('fileWrapper').style.opacity = 0.2;
this._drawSpectrum(analyser);
},
_drawSpectrum: function(analyser) {
var that = this,
canvas = document.getElementById('canvas'),
cwidth = canvas.width,
cheight = canvas.height - 2,
meterWidth = 10, //width of the meters in the spectrum
gap = 2, //gap between meters
capHeight = 2,
capStyle = '#fff',
meterNum = 800 / (10 + 2), //count of the meters
capYPositionArray = []; ////store the vertical position of hte caps for the preivous frame
ctx = canvas.getContext('2d'),
gradient = ctx.createLinearGradient(0, 0, 0, 300);
gradient.addColorStop(1, '#0f0');
gradient.addColorStop(0.5, '#ff0');
gradient.addColorStop(0, '#f00');
var drawMeter = function() {
var array = new Uint8Array(analyser.frequencyBinCount);
analyser.getByteFrequencyData(array);
if (that.status === 0) {
//fix when some sounds end the value still not back to zero
for (var i = array.length - 1; i >= 0; i--) {
array[i] = 0;
};
allCapsReachBottom = true;
for (var i = capYPositionArray.length - 1; i >= 0; i--) {
allCapsReachBottom = allCapsReachBottom && (capYPositionArray[i] === 0);
};
if (allCapsReachBottom) {
cancelAnimationFrame(that.animationId); //since the sound is top and animation finished, stop the requestAnimation to prevent potential memory leak,THIS IS VERY IMPORTANT!
return;
};
};
var step = Math.round(array.length / meterNum); //sample limited data from the total array
ctx.clearRect(0, 0, cwidth, cheight);
for (var i = 0; i < meterNum; i++) {
var value = array[i * step];
if (capYPositionArray.length < Math.round(meterNum)) {
capYPositionArray.push(value);
};
ctx.fillStyle = capStyle;
//draw the cap, with transition effect
if (value < capYPositionArray[i]) {
ctx.fillRect(i * 12, cheight - (--capYPositionArray[i]), meterWidth, capHeight);
} else {
ctx.fillRect(i * 12, cheight - value, meterWidth, capHeight);
capYPositionArray[i] = value;
};
ctx.fillStyle = gradient; //set the filllStyle to gradient for a better look
ctx.fillRect(i * 12 /*meterWidth+gap*/ , cheight - value + capHeight, meterWidth, cheight); //the meter
}
that.animationId = requestAnimationFrame(drawMeter);
}
this.animationId = requestAnimationFrame(drawMeter);
},
_audioEnd: function(instance) {
if (this.forceStop) {
this.forceStop = false;
this.status = 1;
return;
};
this.status = 0;
var text = 'HTML5 Audio API showcase | An Audio Viusalizer';
document.getElementById('fileWrapper').style.opacity = 1;
document.getElementById('info').innerHTML = text;
instance.info = text;
document.getElementById('uploadedFile').value = '';
},
_updateInfo: function(text, processing) {
var infoBar = document.getElementById('info'),
dots = '...',
i = 0,
that = this;
infoBar.innerHTML = text + dots.substring(0, i++);
if (this.infoUpdateId !== null) {
clearTimeout(this.infoUpdateId);
};
if (processing) {
//animate dots at the end of the info text
var animateDot = function() {
if (i > 3) {
i = 0
};
infoBar.innerHTML = text + dots.substring(0, i++);
that.infoUpdateId = setTimeout(animateDot, 250);
}
this.infoUpdateId = setTimeout(animateDot, 250);
};
}
}
</script>
<script>
(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
})(window,document,'script','//www.google-analytics.com/analytics.js','ga');
ga('create', 'UA-46794744-3', 'duapp.com');
ga('send', 'pageview');
</script>
</body>
</html>