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server.go
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server.go
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package webrtc
import (
"github.com/AlexxIT/go2rtc/pkg/core"
"github.com/pion/sdp/v3"
"github.com/pion/webrtc/v3"
)
func (c *Conn) SetOffer(offer string) (err error) {
c.offer = offer
sd := &sdp.SessionDescription{}
if err = sd.Unmarshal([]byte(offer)); err != nil {
return
}
// create transceivers with opposite direction
for _, md := range sd.MediaDescriptions {
var mid string
var tr *webrtc.RTPTransceiver
for _, attr := range md.Attributes {
switch attr.Key {
case core.DirectionSendRecv:
tr, _ = c.pc.AddTransceiverFromTrack(NewTrack(md.MediaName.Media))
case core.DirectionSendonly:
tr, _ = c.pc.AddTransceiverFromKind(
webrtc.NewRTPCodecType(md.MediaName.Media),
webrtc.RTPTransceiverInit{Direction: webrtc.RTPTransceiverDirectionRecvonly},
)
case core.DirectionRecvonly:
tr, _ = c.pc.AddTransceiverFromTrack(
NewTrack(md.MediaName.Media),
webrtc.RTPTransceiverInit{Direction: webrtc.RTPTransceiverDirectionSendonly},
)
case "mid":
mid = attr.Value
}
}
if mid != "" && tr != nil {
_ = tr.SetMid(mid)
}
}
c.medias = UnmarshalMedias(sd.MediaDescriptions)
return
}
func (c *Conn) GetAnswer() (answer string, err error) {
// we need to process remote offer after we create transeivers
desc := webrtc.SessionDescription{Type: webrtc.SDPTypeOffer, SDP: c.offer}
if err = c.pc.SetRemoteDescription(desc); err != nil {
return "", err
}
// disable transceivers if we don't have track, make direction=inactive
transeivers:
for _, tr := range c.pc.GetTransceivers() {
for _, sender := range c.senders {
if sender.Media.ID == tr.Mid() {
continue transeivers
}
}
switch tr.Direction() {
case webrtc.RTPTransceiverDirectionSendrecv:
_ = tr.Sender().Stop()
case webrtc.RTPTransceiverDirectionSendonly:
_ = tr.Stop()
}
}
if desc, err = c.pc.CreateAnswer(nil); err != nil {
return
}
if err = c.pc.SetLocalDescription(desc); err != nil {
return
}
return c.pc.LocalDescription().SDP, nil
}
func (c *Conn) GetCompleteAnswer() (answer string, err error) {
if _, err = c.GetAnswer(); err != nil {
return
}
<-webrtc.GatheringCompletePromise(c.pc)
return c.pc.LocalDescription().SDP, nil
}