Add support OPUS, MP3, PCMU, PCMA for MP4

pkg/mp4/consumer.go

@@ -50,7 +50,6 @@ func (c *Consumer) GetMedias() []*streamer.Media {
 			Direction: streamer.DirectionRecvonly,
 			Codecs: []*streamer.Codec{
 				{Name: streamer.CodecAAC},
-				{Name: streamer.CodecOpus},
 			},
 		},
 	}
@@ -143,7 +142,7 @@ func (c *Consumer) AddTrack(media *streamer.Media, track *streamer.Track) *strea
 
 		return track.Bind(push)
 
-	case streamer.CodecOpus:
+	case streamer.CodecOpus, streamer.CodecMP3, streamer.CodecPCMU, streamer.CodecPCMA:
 		push := func(packet *rtp.Packet) error {
 			if c.wait != waitNone {
 				return nil

pkg/mp4/muxer.go

@@ -108,7 +108,7 @@ func (m *Muxer) GetInit(codecs []*streamer.Codec) ([]byte, error) {
 				uint32(i+1), codec.Name, codec.ClockRate, codec.Channels, b,
 			)
 
-		case streamer.CodecOpus:
+		case streamer.CodecOpus, streamer.CodecMP3, streamer.CodecPCMU, streamer.CodecPCMA:
 			mv.WriteAudioTrack(
 				uint32(i+1), codec.Name, codec.ClockRate, codec.Channels, nil,
 			)