fixes

pkg/rtc/participant.go

@@ -1327,7 +1327,6 @@ func (p *ParticipantImpl) AddTrack(req *livekit.AddTrackRequest) {
 
 	p.sendTrackPublished(req.Cid, ti)
 
-	// SINGLE-PEER-CONNECTION-TODO: is this needed?
 	p.handlePendingRemoteTracks()
 }
 

pkg/rtc/transport.go

@@ -1009,12 +1009,22 @@ func (t *PCTransport) RemoveTrack(sender *webrtc.RTPSender) error {
 	return t.pc.RemoveTrack(sender)
 }
 
-func (t *PCTransport) CurrentLocalDescription() *webrtc.SessionDescription {
-	return t.pc.CurrentLocalDescription()
+func (t *PCTransport) CurrentLocalDescription() webrtc.SessionDescription {
+	cld := t.pc.CurrentLocalDescription()
+	if cld == nil {
+		return webrtc.SessionDescription{}
+	}
+
+	return *cld
 }
 
-func (t *PCTransport) CurrentRemoteDescription() *webrtc.SessionDescription {
-	return t.pc.CurrentRemoteDescription()
+func (t *PCTransport) CurrentRemoteDescription() webrtc.SessionDescription {
+	crd := t.pc.CurrentRemoteDescription()
+	if crd == nil {
+		return webrtc.SessionDescription{}
+	}
+
+	return *crd
 }
 
 func (t *PCTransport) GetMid(rtpReceiver *webrtc.RTPReceiver) string {

pkg/rtc/transportmanager.go

@@ -411,27 +411,25 @@ func (t *TransportManager) createDataChannelsForSubscriber(pendingDataChannels [
 
 func (t *TransportManager) GetUnmatchMediaForOffer(parsedOffer *sdp.SessionDescription, mediaType string) (unmatched []*sdp.MediaDescription, err error) {
 	var lastMatchedMid string
-	var lastAnswer *webrtc.SessionDescription
+	var lastAnswer webrtc.SessionDescription
 	if t.params.SinglePeerConnection {
 		lastAnswer = t.subscriber.CurrentLocalDescription()
 	} else {
 		lastAnswer = t.publisher.CurrentLocalDescription()
 	}
-	if lastAnswer != nil {
-		t.params.Logger.Infow("RAJA lastAnswer", "lastAnswer", lastAnswer) // REMOVE
-		parsedAnswer, err1 := lastAnswer.Unmarshal()
-		if err1 != nil {
-			// should not happen
-			t.params.Logger.Errorw("failed to parse last answer", err1)
-			return unmatched, err1
-		}
 
-		for i := len(parsedAnswer.MediaDescriptions) - 1; i >= 0; i-- {
-			media := parsedAnswer.MediaDescriptions[i]
-			if media.MediaName.Media == mediaType {
-				lastMatchedMid, _ = media.Attribute(sdp.AttrKeyMID)
-				break
-			}
+	parsedAnswer, err1 := lastAnswer.Unmarshal()
+	if err1 != nil {
+		// should not happen
+		t.params.Logger.Errorw("failed to parse last answer", err1)
+		return unmatched, err1
+	}
+
+	for i := len(parsedAnswer.MediaDescriptions) - 1; i >= 0; i-- {
+		media := parsedAnswer.MediaDescriptions[i]
+		if media.MediaName.Media == mediaType {
+			lastMatchedMid, _ = media.Attribute(sdp.AttrKeyMID)
+			break
 		}
 	}
 
@@ -449,7 +447,7 @@ func (t *TransportManager) GetUnmatchMediaForOffer(parsedOffer *sdp.SessionDescr
 	return
 }
 
-func (t *TransportManager) LastPublisherOffer() *webrtc.SessionDescription {
+func (t *TransportManager) LastPublisherOffer() webrtc.SessionDescription {
 	/* RAJA-REMOVE
 	if sd := t.lastPublisherOffer.Load(); sd != nil {
 		return sd.(webrtc.SessionDescription)