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hlsMuxer.go
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/
hlsMuxer.go
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package main
import (
"context"
"math"
"sort"
"strconv"
"sync"
"time"
"github.com/deepch/vdk/av"
)
//MuxerHLS struct
type MuxerHLS struct {
mutex sync.RWMutex
UUID string //Current UUID
MSN int //Current MSN
FPS int //Current FPS
MediaSequence int //Current MediaSequence
CurrentFragmentID int //Current fragment id
CacheM3U8 string //Current index cache
CurrentSegment *Segment //Current segment link
Segments map[int]*Segment //Current segments group
FragmentCtx context.Context //chan 1-N
FragmentCancel context.CancelFunc //chan 1-N
}
//NewHLSMuxer Segments
func NewHLSMuxer(uuid string) *MuxerHLS {
ctx, cancel := context.WithCancel(context.Background())
return &MuxerHLS{
UUID: uuid,
MSN: -1,
Segments: make(map[int]*Segment),
FragmentCtx: ctx,
FragmentCancel: cancel,
}
}
//SetFPS func
func (element *MuxerHLS) SetFPS(fps int) {
element.FPS = fps
}
//WritePacket func
func (element *MuxerHLS) WritePacket(packet *av.Packet) {
element.mutex.Lock()
defer element.mutex.Unlock()
//TODO delete packet.IsKeyFrame if need no EXT-X-INDEPENDENT-SEGMENTS
if packet.IsKeyFrame && (element.CurrentSegment == nil || element.CurrentSegment.GetDuration().Seconds() >= 4) {
if element.CurrentSegment != nil {
element.CurrentSegment.Close()
if len(element.Segments) > 6 {
delete(element.Segments, element.MSN-6)
element.MediaSequence++
}
}
element.CurrentSegment = element.NewSegment()
element.CurrentSegment.SetFPS(element.FPS)
}
element.CurrentSegment.WritePacket(packet)
CurrentFragmentID := element.CurrentSegment.GetFragmentID()
if CurrentFragmentID != element.CurrentFragmentID {
element.UpdateIndexM3u8()
}
element.CurrentFragmentID = CurrentFragmentID
}
//UpdateIndexM3u8 func
func (element *MuxerHLS) UpdateIndexM3u8() {
var header string
var body string
var partTarget time.Duration
var segmentTarget time.Duration
segmentTarget = time.Second * 2
for _, segmentKey := range element.SortSegments(element.Segments) {
for _, fragmentKey := range element.SortFragment(element.Segments[segmentKey].Fragment) {
if element.Segments[segmentKey].Fragment[fragmentKey].Finish {
var independent string
if element.Segments[segmentKey].Fragment[fragmentKey].Independent {
independent = ",INDEPENDENT=YES"
}
body += "#EXT-X-PART:DURATION=" + strconv.FormatFloat(element.Segments[segmentKey].Fragment[fragmentKey].GetDuration().Seconds(), 'f', 5, 64) + "" + independent + ",URI=\"fragment/" + strconv.Itoa(segmentKey) + "/" + strconv.Itoa(fragmentKey) + "/0qrm9ru6." + strconv.Itoa(fragmentKey) + ".m4s\"\n"
partTarget = element.Segments[segmentKey].Fragment[fragmentKey].Duration
} else {
body += "#EXT-X-PRELOAD-HINT:TYPE=PART,URI=\"fragment/" + strconv.Itoa(segmentKey) + "/" + strconv.Itoa(fragmentKey) + "/0qrm9ru6." + strconv.Itoa(fragmentKey) + ".m4s\"\n"
}
}
if element.Segments[segmentKey].Finish {
segmentTarget = element.Segments[segmentKey].Duration
body += "#EXT-X-PROGRAM-DATE-TIME:" + element.Segments[segmentKey].Time.Format("2006-01-02T15:04:05.000000Z") + "\n#EXTINF:" + strconv.FormatFloat(element.Segments[segmentKey].Duration.Seconds(), 'f', 5, 64) + ",\n"
body += "segment/" + strconv.Itoa(segmentKey) + "/" + element.UUID + "." + strconv.Itoa(segmentKey) + ".m4s\n"
}
}
header += "#EXTM3U\n"
header += "#EXT-X-TARGETDURATION:" + strconv.Itoa(int(math.Round(segmentTarget.Seconds()))) + "\n"
header += "#EXT-X-VERSION:7\n"
header += "#EXT-X-INDEPENDENT-SEGMENTS\n"
header += "#EXT-X-SERVER-CONTROL:CAN-BLOCK-RELOAD=YES,PART-HOLD-BACK=" + strconv.FormatFloat(partTarget.Seconds()*4, 'f', 5, 64) + ",HOLD-BACK=" + strconv.FormatFloat(segmentTarget.Seconds()*4, 'f', 5, 64) + "\n"
header += "#EXT-X-MAP:URI=\"init.mp4\"\n"
header += "#EXT-X-PART-INF:PART-TARGET=" + strconv.FormatFloat(partTarget.Seconds(), 'f', 5, 64) + "\n"
header += "#EXT-X-MEDIA-SEQUENCE:" + strconv.Itoa(element.MediaSequence) + "\n"
header += body
element.CacheM3U8 = header
element.PlaylistUpdate()
}
//PlaylistUpdate func
func (element *MuxerHLS) PlaylistUpdate() {
element.FragmentCancel()
element.FragmentCtx, element.FragmentCancel = context.WithCancel(context.Background())
}
//GetSegment func
func (element *MuxerHLS) GetSegment(segment int) ([]*av.Packet, error) {
element.mutex.Lock()
defer element.mutex.Unlock()
if segmentTmp, ok := element.Segments[segment]; ok && len(segmentTmp.Fragment) > 0 {
var res []*av.Packet
for _, v := range element.SortFragment(segmentTmp.Fragment) {
res = append(res, segmentTmp.Fragment[v].Packets...)
}
return res, nil
}
return nil, ErrorStreamNotFound
}
//GetFragment func
func (element *MuxerHLS) GetFragment(segment int, fragment int) ([]*av.Packet, error) {
element.mutex.Lock()
if segmentTmp, segmentTmpOK := element.Segments[segment]; segmentTmpOK {
if fragmentTmp, fragmentTmpOK := segmentTmp.Fragment[fragment]; fragmentTmpOK {
if fragmentTmp.Finish {
element.mutex.Unlock()
return fragmentTmp.Packets, nil
} else {
element.mutex.Unlock()
pck, err := element.WaitFragment(time.Second*1, segment, fragment)
if err != nil {
return nil, err
}
return pck, err
}
}
}
element.mutex.Unlock()
return nil, ErrorStreamNotFound
}
//GetIndexM3u8 func
func (element *MuxerHLS) GetIndexM3u8(needMSN int, needPart int) (string, error) {
element.mutex.Lock()
if len(element.CacheM3U8) != 0 && ((needMSN == -1 || needPart == -1) || (needMSN-element.MSN > 1) || (needMSN == element.MSN && needPart < element.CurrentFragmentID)) {
element.mutex.Unlock()
return element.CacheM3U8, nil
} else {
element.mutex.Unlock()
index, err := element.WaitIndex(time.Second*3, needMSN, needPart)
if err != nil {
return "", err
}
return index, err
}
}
//WaitFragment func
func (element *MuxerHLS) WaitFragment(timeOut time.Duration, segment, fragment int) ([]*av.Packet, error) {
select {
case <-time.After(timeOut):
return nil, ErrorStreamNotFound
case <-element.FragmentCtx.Done():
element.mutex.Lock()
defer element.mutex.Unlock()
if segmentTmp, segmentTmpOK := element.Segments[segment]; segmentTmpOK {
if fragmentTmp, fragmentTmpOK := segmentTmp.Fragment[fragment]; fragmentTmpOK {
if fragmentTmp.Finish {
return fragmentTmp.Packets, nil
}
}
}
return nil, ErrorStreamNotFound
}
}
//WaitIndex func
func (element *MuxerHLS) WaitIndex(timeOut time.Duration, segment, fragment int) (string, error) {
for {
select {
case <-time.After(timeOut):
return "", ErrorStreamNotFound
case <-element.FragmentCtx.Done():
element.mutex.Lock()
if element.MSN < segment || (element.MSN == segment && element.CurrentFragmentID < fragment) {
log.Println("wait req", element.MSN, element.CurrentFragmentID, segment, fragment)
element.mutex.Unlock()
continue
}
element.mutex.Unlock()
return element.CacheM3U8, nil
}
}
}
//SortFragment func
func (element *MuxerHLS) SortFragment(val map[int]*Fragment) []int {
keys := make([]int, len(val))
i := 0
for k := range val {
keys[i] = k
i++
}
sort.Ints(keys)
return keys
}
//SortSegments fuc
func (element *MuxerHLS) SortSegments(val map[int]*Segment) []int {
keys := make([]int, len(val))
i := 0
for k := range val {
keys[i] = k
i++
}
sort.Ints(keys)
return keys
}
func (element *MuxerHLS) Close() {
}