webrtc: fix bad quality when converting Opus from WebRTC to LL-HLS (#2499) (#2740)

internal/protocols/mpegts/to_stream.go

@@ -113,7 +113,7 @@ func ToStream(r *mpegts.Reader, stream **stream.Stream) ([]*description.Media, e
 				Type: description.MediaTypeAudio,
 				Formats: []format.Format{&format.Opus{
 					PayloadTyp: 96,
-					IsStereo:   (codec.ChannelCount == 2),
+					IsStereo:   (codec.ChannelCount >= 2),
 				}},
 			}
 

internal/protocols/webrtc/incoming_track.go

@@ -72,6 +72,7 @@ func newIncomingTrack(
 	case strings.ToLower(webrtc.MimeTypeOpus):
 		t.format = &format.Opus{
 			PayloadTyp: uint8(track.PayloadType()),
+			IsStereo:   strings.Contains(track.Codec().SDPFmtpLine, "stereo=1"),
 		}
 
 	case strings.ToLower(webrtc.MimeTypeG722):

internal/staticsources/hls/source.go

@@ -174,7 +174,7 @@ func (s *Source) Run(params defs.StaticSourceRunParams) error {
 						Type: description.MediaTypeAudio,
 						Formats: []format.Format{&format.Opus{
 							PayloadTyp: 96,
-							IsStereo:   (tcodec.ChannelCount == 2),
+							IsStereo:   (tcodec.ChannelCount >= 2),
 						}},
 					}