Fix support sendrecv media for WebRTC passive consumer

pkg/webrtc/consumer.go

@@ -19,11 +19,11 @@ func (c *Conn) AddTrack(media *streamer.Media, track *streamer.Track) *streamer.
 		switch track.Direction {
 		case streamer.DirectionSendonly:
 			// send our track to WebRTC consumer
-			return c.addConsumerSendTrack(track)
+			return c.addConsumerSendTrack(media, track)
 
 		case streamer.DirectionRecvonly:
 			// receive track from WebRTC consumer (microphone, backchannel, two way audio)
-			return c.addConsumerRecvTrack(track)
+			return c.addConsumerRecvTrack(media, track)
 		}
 
 	case streamer.ModePassiveProducer:
@@ -42,7 +42,7 @@ func (c *Conn) AddTrack(media *streamer.Media, track *streamer.Track) *streamer.
 	panic("not implemented")
 }
 
-func (c *Conn) addConsumerSendTrack(track *streamer.Track) *streamer.Track {
+func (c *Conn) addConsumerSendTrack(media *streamer.Media, track *streamer.Track) *streamer.Track {
 	codec := track.Codec
 
 	// webrtc.codecParametersFuzzySearch
@@ -73,6 +73,10 @@ func (c *Conn) addConsumerSendTrack(track *streamer.Track) *streamer.Track {
 		return nil
 	}
 
+	if err = tr.SetMid(media.MID); err != nil {
+		return nil
+	}
+
 	codecs := []webrtc.RTPCodecParameters{{RTPCodecCapability: caps}}
 	if err = tr.SetCodecPreferences(codecs); err != nil {
 		return nil
@@ -110,7 +114,7 @@ func (c *Conn) addConsumerSendTrack(track *streamer.Track) *streamer.Track {
 	return track
 }
 
-func (c *Conn) addConsumerRecvTrack(track *streamer.Track) *streamer.Track {
+func (c *Conn) addConsumerRecvTrack(media *streamer.Media, track *streamer.Track) *streamer.Track {
 	caps := webrtc.RTPCodecCapability{
 		MimeType:  MimeType(track.Codec),
 		ClockRate: track.Codec.ClockRate,
@@ -123,6 +127,10 @@ func (c *Conn) addConsumerRecvTrack(track *streamer.Track) *streamer.Track {
 		return nil
 	}
 
+	if err = tr.SetMid(media.MID); err != nil {
+		return nil
+	}
+
 	codecs := []webrtc.RTPCodecParameters{
 		{RTPCodecCapability: caps, PayloadType: webrtc.PayloadType(track.Codec.PayloadType)},
 	}

pkg/webrtc/server.go

@@ -33,7 +33,8 @@ func (c *Conn) SetOffer(offer string) (err error) {
 }
 
 func (c *Conn) GetAnswer() (answer string, err error) {
-	if c.Mode == streamer.ModePassiveProducer {
+	switch c.Mode {
+	case streamer.ModePassiveProducer:
 		// init all Sender(s) for passive producer or they will be nil
 		// sender for passive producer is backchannel
 		sd := &sdp.SessionDescription{}
@@ -59,6 +60,22 @@ func (c *Conn) GetAnswer() (answer string, err error) {
 				}
 			}
 		}
+
+	case streamer.ModePassiveConsumer:
+		// fix sendrecv transeivers - set for sendonly codecs from recvonly
+		for _, tr1 := range c.pc.GetTransceivers() {
+			for _, tr2 := range c.pc.GetTransceivers() {
+				if tr1 == tr2 {
+					continue
+				}
+				if tr1.Mid() == tr2.Mid() && tr2.Direction() == webrtc.RTPTransceiverDirectionRecvonly {
+					codecs := tr2.Receiver().GetParameters().Codecs
+					if err = tr1.SetCodecPreferences(codecs); err != nil {
+						return "", err
+					}
+				}
+			}
+		}
 	}
 
 	// we need to process remote offer after we create transeivers