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adapter.go
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adapter.go
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package webrtc
import (
"bytes"
"encoding/base64"
"errors"
"time"
"github.com/pion/webrtc/v3"
"github.com/deepch/vdk/av"
"github.com/deepch/vdk/codec/h264parser"
"github.com/pion/webrtc/v3/pkg/media"
)
var (
ErrorNotFound = errors.New("stream not found")
ErrorCodecNotSupported = errors.New("codec not supported")
ErrorClientOffline = errors.New("client offline")
Label = "track_"
)
type Muxer struct {
streams map[int8]*Stream
status webrtc.ICEConnectionState
stop bool
pc *webrtc.PeerConnection
pt *time.Timer
ps chan bool
}
type Stream struct {
codec av.CodecData
ts time.Duration
track *webrtc.TrackLocalStaticSample
}
func NewMuxer() *Muxer {
tmp := Muxer{ps: make(chan bool, 100), pt: time.NewTimer(time.Second * 20), streams: make(map[int8]*Stream)}
go tmp.WaitCloser()
return &tmp
}
func (element *Muxer) WriteHeader(streams []av.CodecData, sdp64 string) (string, error) {
if len(streams) == 0 {
return "", ErrorNotFound
}
sdpB, err := base64.StdEncoding.DecodeString(sdp64)
if err != nil {
return "", err
}
offer := webrtc.SessionDescription{
Type: webrtc.SDPTypeOffer,
SDP: string(sdpB),
}
peerConnection, err := webrtc.NewPeerConnection(webrtc.Configuration{})
if err != nil {
return "", err
}
for i, i2 := range streams {
var track *webrtc.TrackLocalStaticSample
if i2.Type().IsVideo() {
if i2.Type() != av.H264 {
return "", errors.New("Video Not h264 codec not supported")
}
track, err = webrtc.NewTrackLocalStaticSample(webrtc.RTPCodecCapability{
MimeType: "video/h264",
}, "pion-rtsp-video", "pion-rtsp-video")
if err != nil {
return "", err
}
if _, err = peerConnection.AddTrack(track); err != nil {
return "", err
}
} else if i2.Type().IsAudio() {
AudioCodecString := "audio/PCMU"
switch i2.Type() {
case av.PCM_ALAW:
AudioCodecString = "audio/PCMA"
case av.PCM_MULAW:
AudioCodecString = "audio/PCMU"
default:
return "", errors.New("No Audio Codec Supported")
continue
}
//log.Fatalln(i2.Type())
track, err = webrtc.NewTrackLocalStaticSample(webrtc.RTPCodecCapability{
MimeType: AudioCodecString,
}, "pion-rtsp-audio", "pion-rtsp-audio")
if err != nil {
return "", err
}
if _, err = peerConnection.AddTrack(track); err != nil {
return "", err
}
}
element.streams[int8(i)] = &Stream{track: track, codec: i2}
}
peerConnection.OnICEConnectionStateChange(func(connectionState webrtc.ICEConnectionState) {
element.status = connectionState
if connectionState == webrtc.ICEConnectionStateDisconnected {
element.ps <- true
}
})
peerConnection.OnDataChannel(func(d *webrtc.DataChannel) {
d.OnMessage(func(msg webrtc.DataChannelMessage) {
element.pt.Reset(5 * time.Second)
})
})
if err = peerConnection.SetRemoteDescription(offer); err != nil {
return "", err
}
gatherCompletePromise := webrtc.GatheringCompletePromise(peerConnection)
answer, err := peerConnection.CreateAnswer(nil)
if err != nil {
return "", err
}
if err = peerConnection.SetLocalDescription(answer); err != nil {
return "", err
}
element.pc = peerConnection
waitT := time.NewTimer(time.Second * 20)
select {
case <-waitT.C:
return "", errors.New("gatherCompletePromise wait")
case <-gatherCompletePromise:
}
resp := peerConnection.LocalDescription()
return base64.StdEncoding.EncodeToString([]byte(resp.SDP)), nil
}
func (element *Muxer) WritePacket(pkt av.Packet) (err error) {
if element.stop {
return ErrorClientOffline
}
if element.status != webrtc.ICEConnectionStateConnected {
return nil
}
if tmp, ok := element.streams[pkt.Idx]; ok {
if tmp.ts == 0 {
tmp.ts = pkt.Time
}
switch tmp.codec.Type() {
case av.H264:
codec := tmp.codec.(h264parser.CodecData)
if pkt.IsKeyFrame {
pkt.Data = append([]byte{0, 0, 0, 1}, bytes.Join([][]byte{codec.SPS(), codec.PPS(), pkt.Data[4:]}, []byte{0, 0, 0, 1})...)
} else {
pkt.Data = pkt.Data[4:]
}
//log.Println("video", pkt.Time-tmp.ts)
case av.PCM_MULAW:
//log.Println("audio", pkt.Time-tmp.ts)
case av.PCM_ALAW:
//log.Println("audio", pkt.Time-tmp.ts)
default:
return ErrorCodecNotSupported
}
//log.Println(tmp.codec.Type(), pkt.Time-tmp.ts)
err := tmp.track.WriteSample(media.Sample{Data: pkt.Data, Duration: pkt.Time - tmp.ts})
element.streams[pkt.Idx].ts = pkt.Time
return err
}
return ErrorNotFound
}
func (element *Muxer) WaitCloser() {
select {
case <-element.ps:
element.stop = true
element.Close()
case <-element.pt.C:
element.stop = true
element.Close()
}
}
func (element *Muxer) Close() error {
if element.pc != nil {
err := element.pc.Close()
if err != nil {
return err
}
}
return nil
}