fix: use engine's aac format

publisher.go

@@ -67,15 +67,21 @@ func (p *RTSPPublisher) SetTracks() error {
 			case *format.MPEG4Audio:
 				at := p.AudioTrack
 				if at == nil {
-					at := p.CreateAudioTrack(codec.CodecID_AAC, byte(f.PayloadType()), uint32(f.Config.SampleRate)).(*AAC)
-					at.IndexDeltaLength = f.IndexDeltaLength
-					at.IndexLength = f.IndexLength
-					at.SizeLength = f.SizeLength
-					if f.Config.Type == mpeg4audio.ObjectTypeAACLC {
+					conf := f.Config
+					if f.LATM && f.StreamMuxConfig != nil && len(f.StreamMuxConfig.Programs) > 0 && len(f.StreamMuxConfig.Programs[0].Layers) > 0 {
+						conf = f.StreamMuxConfig.Programs[0].Layers[0].AudioSpecificConfig
+					}
+					at := p.CreateAudioTrack(codec.CodecID_AAC, byte(f.PayloadType()), uint32(conf.SampleRate)).(*AAC)
+					at.AACFormat = f
+					at.AACDecoder.LATM = f.LATM
+					at.AACDecoder.IndexDeltaLength = f.IndexDeltaLength
+					at.AACDecoder.IndexLength = f.IndexLength
+					at.AACDecoder.SizeLength = f.SizeLength
+					if conf.Type == mpeg4audio.ObjectTypeAACLC {
 						at.Mode = 1
 					}
-					at.Channels = uint8(f.Config.ChannelCount)
-					asc, _ := f.Config.Marshal()
+					at.Channels = uint8(conf.ChannelCount)
+					asc, _ := conf.Marshal()
 					// 复用AVCC写入逻辑，解析出AAC的配置信息
 					at.WriteSequenceHead(append([]byte{0xAF, 0x00}, asc...))
 				}

subscriber.go

@@ -69,19 +69,23 @@ func (s *RTSPSubscriber) OnEvent(event any) {
 		}
 		switch v.CodecID {
 		case codec.CodecID_AAC:
-			s.audioTrack = &description.Media{
-				Type: description.MediaTypeAudio,
-				Formats: []format.Format{&format.MPEG4Audio{
+			f := v.AACFormat
+			if f == nil {
+				f = &format.MPEG4Audio{
 					PayloadTyp: v.PayloadType,
 					Config: &mpeg4audio.Config{
 						Type:         mpeg4audio.ObjectTypeAACLC,
 						SampleRate:   int(v.SampleRate),
 						ChannelCount: int(v.Channels),
 					},
-					SizeLength:       v.SizeLength,
-					IndexLength:      v.IndexLength,
-					IndexDeltaLength: v.IndexDeltaLength,
-				}},
+					SizeLength:       v.AACDecoder.SizeLength,
+					IndexLength:      v.AACDecoder.IndexLength,
+					IndexDeltaLength: v.AACDecoder.IndexDeltaLength,
+				}
+			}
+			s.audioTrack = &description.Media{
+				Type:    description.MediaTypeAudio,
+				Formats: []format.Format{f},
 			}
 		case codec.CodecID_PCMA:
 			s.audioTrack = &description.Media{