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track.go
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track.go
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package webrtc
import (
"github.com/pion/rtp"
"github.com/pion/webrtc/v3"
)
type Track struct {
kind string
id string
streamID string
sequence uint16
ssrc uint32
writer webrtc.TrackLocalWriter
}
func NewTrack(kind string) *Track {
return &Track{
kind: kind,
id: "go2rtc-" + kind,
streamID: "go2rtc",
}
}
func (t *Track) Bind(context webrtc.TrackLocalContext) (webrtc.RTPCodecParameters, error) {
t.ssrc = uint32(context.SSRC())
t.writer = context.WriteStream()
for _, parameters := range context.CodecParameters() {
// return first parameters
return parameters, nil
}
return webrtc.RTPCodecParameters{}, nil
}
func (t *Track) Unbind(context webrtc.TrackLocalContext) error {
t.writer = nil
return nil
}
func (t *Track) ID() string {
return t.id
}
func (t *Track) RID() string {
return "" // don't know what it is
}
func (t *Track) StreamID() string {
return t.streamID
}
func (t *Track) Kind() webrtc.RTPCodecType {
return webrtc.NewRTPCodecType(t.kind)
}
func (t *Track) WriteRTP(payloadType uint8, packet *rtp.Packet) error {
// in case when we start WriteRTP before Track.Bind
if t.writer == nil {
return nil
}
// important to have internal counter if input packets from different sources
t.sequence++
header := packet.Header
header.SSRC = t.ssrc
header.PayloadType = payloadType
header.SequenceNumber = t.sequence
_, err := t.writer.WriteRTP(&header, packet.Payload)
return err
}