Add support S16LE (PCM-LE) for RTSP server

pkg/core/media.go

@@ -124,9 +124,13 @@ func MarshalSDP(name string, medias []*Media) ([]byte, error) {
 
 		codec := media.Codecs[0]
 
-		name := codec.Name
-		if name == CodecELD {
+		switch codec.Name {
+		case CodecELD:
 			name = CodecAAC
+		case CodecPCML:
+			name = CodecPCM // beacuse we using pcm.LittleToBig for RTSP server
+		default:
+			name = codec.Name
 		}
 
 		md := &sdp.MediaDescription{

pkg/rtsp/consumer.go

@@ -162,6 +162,8 @@ func (c *Conn) packetWriter(codec *core.Codec, channel, payloadType uint8) core.
 		case core.CodecJPEG:
 			handlerFunc = mjpeg.RTPPay(handlerFunc)
 		}
+	} else if codec.Name == core.CodecPCML {
+		handlerFunc = pcm.LittleToBig(handlerFunc)
 	} else if c.PacketSize != 0 {
 		switch codec.Name {
 		case core.CodecH264: