add avc format doc. decode the flv codec info

@@ -151,6 +151,7 @@ int SrsClient::do_cycle()
 	// find a source to publish.
 	SrsSource* source = SrsSource::find(req->get_stream_url());
 	srs_assert(source != NULL);
+	SrsHLS* hls = source->get_hls();
 	
 	bool enabled_cache = true;
 	conf = config->get_gop_cache(req->vhost);
@@ -181,6 +182,7 @@ int SrsClient::do_cycle()
 			}
 			srs_info("start to publish stream %s success", req->stream.c_str());
 			ret = publish(source, true);
+			hls->on_unpublish();
 			source->on_unpublish();
 			return ret;
 		}
@@ -193,6 +195,7 @@ int SrsClient::do_cycle()
 			}
 			srs_info("flash start to publish stream %s success", req->stream.c_str());
 			ret = publish(source, false);
+			hls->on_unpublish();
 			source->on_unpublish();
 			return ret;
 		}
@@ -330,8 +333,15 @@ int SrsClient::publish(SrsSource* source, bool is_fmle)
 	srs_verbose("check publish_refer success.");
 	
 	SrsPithyPrint pithy_print(SRS_STAGE_PUBLISH_USER);
-	
 	SrsHLS* hls = source->get_hls();
+	
+	// notify the hls to prepare when publish start.
+	if ((ret = hls->on_publish()) != ERROR_SUCCESS) {
+		srs_error("hls on_publish failed. ret=%d", ret);
+		return ret;
+	}
+	srs_verbose("hls on_publish success.");
+	
 	while (true) {
 		// switch to other st-threads.
 		st_usleep(0);
@@ -366,14 +376,26 @@ int SrsClient::process_publish_message(SrsSource* source, SrsHLS* hls, SrsCommon
 	int ret = ERROR_SUCCESS;
 	
 	// process audio packet
-	if (msg->header.is_audio() && ((ret = source->on_audio(msg)) != ERROR_SUCCESS)) {
-		srs_error("process audio message failed. ret=%d", ret);
-		return ret;
+	if (msg->header.is_audio()) {
+		if ((ret = hls->on_audio(msg)) != ERROR_SUCCESS) {
+			srs_error("hls process audio message failed. ret=%d", ret);
+			return ret;
+		}
+		if ((ret = source->on_audio(msg)) != ERROR_SUCCESS) {
+			srs_error("source process audio message failed. ret=%d", ret);
+			return ret;
+		}
 	}
 	// process video packet
-	if (msg->header.is_video() && ((ret = source->on_video(msg)) != ERROR_SUCCESS)) {
-		srs_error("process video message failed. ret=%d", ret);
-		return ret;
+	if (msg->header.is_video()) {
+		if ((ret = hls->on_video(msg)) != ERROR_SUCCESS) {
+			srs_error("hls process video message failed. ret=%d", ret);
+			return ret;
+		}
+		if ((ret = source->on_video(msg)) != ERROR_SUCCESS) {
+			srs_error("source process video message failed. ret=%d", ret);
+			return ret;
+		}
 	}
 	
 	// process onMetaData
@@ -386,8 +408,12 @@ int SrsClient::process_publish_message(SrsSource* source, SrsHLS* hls, SrsCommon
 		SrsPacket* pkt = msg->get_packet();
 		if (dynamic_cast<SrsOnMetaDataPacket*>(pkt)) {
 			SrsOnMetaDataPacket* metadata = dynamic_cast<SrsOnMetaDataPacket*>(pkt);
+			if ((ret = hls->on_meta_data(metadata)) != ERROR_SUCCESS) {
+				srs_error("hls process onMetaData message failed. ret=%d", ret);
+				return ret;
+			}
 			if ((ret = source->on_meta_data(msg, metadata)) != ERROR_SUCCESS) {
-				srs_error("process onMetaData message failed. ret=%d", ret);
+				srs_error("source process onMetaData message failed. ret=%d", ret);
 				return ret;
 			}
 			srs_trace("process onMetaData message success.");

@@ -23,32 +23,84 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 #include <srs_core_codec.hpp>
 
+#include <srs_core_error.hpp>
+#include <srs_core_stream.hpp>
+
 SrsCodec::SrsCodec()
 {
+	width 					= 0;
+	height 					= 0;
+	duration 				= 0;
+	frame_rate 				= 0;
+	video_data_rate 		= 0;
+	video_codec_id 			= 0;
+	audio_data_rate 		= 0;
+	audio_codec_id 			= 0;
+	aac_sample_rate	 		= 0;
+	sample_rate		 		= 0;
+	sample_size		 		= 0;
+	audio_channels	 		= 0;
+	profile 				= 0;
+	level 					= 0;
+	avc_extra_size 			= 0;
+	avc_extra_data 			= NULL;
+	aac_extra_size 			= 0;
+	aac_extra_data 			= NULL;
+
+	stream = new SrsStream();
 }
 
 SrsCodec::~SrsCodec()
 {
+	srs_freepa(avc_extra_data);
+	srs_freepa(aac_extra_data);
+
+	srs_freep(stream);
 }
 
-bool SrsCodec::video_is_keyframe(int8_t* data, int size)
+int SrsCodec::parse_av_codec(bool is_video, int8_t* data, int size)
 {
-	// E.4.3.1 VIDEODATA
-	// Frame Type UB [4]
-	// Type of video frame. The following values are defined:
-	// 	1 = key frame (for AVC, a seekable frame)
-	// 	2 = inter frame (for AVC, a non-seekable frame)
-	// 	3 = disposable inter frame (H.263 only)
-	// 	4 = generated key frame (reserved for server use only)
-	// 	5 = video info/command frame
-	//
-	// AVCPacketType IF CodecID == 7 UI8
-	// The following values are defined:
-	// 	0 = AVC sequence header
-	// 	1 = AVC NALU
-	// 	2 = AVC end of sequence (lower level NALU sequence ender is
-	// 		not required or supported)
+	int ret = ERROR_SUCCESS;
+	
+	if (!data || size <= 0) {
+		return ret;
+	}
+	
+	if ((ret = stream->initialize((char*)data, size)) != ERROR_SUCCESS) {
+		return ret;
+	}
+	
+	if (is_video) {
+		if (!stream->require(1)) {
+			return ret;
+		}
+		
+		int8_t frame_type = stream->read_1bytes();
+		int8_t codec_id = frame_type & 0x0f;
+		frame_type = (frame_type >> 4) & 0x0f;
+		
+		video_codec_id = codec_id;
+		if (codec_id != SrsCodecVideoAVC) {
+			return ret;
+		}
+		
+		if (!stream->require(4)) {
+			return ret;
+		}
+		int8_t avc_packet_type = stream->read_1bytes();
+		int32_t composition_time = stream->read_3bytes();
+		
+		// 5.2.4.1.1 Syntax
+		if (avc_packet_type == SrsCodecVideoAVCTypeSequenceHeader) {
+		}
+	} else {
+	}
 	
+	return ret;
+}
+
+bool SrsCodec::video_is_keyframe(int8_t* data, int size)
+{
 	// 2bytes required.
 	if (size < 1) {
 		return false;
@@ -57,27 +109,11 @@ bool SrsCodec::video_is_keyframe(int8_t* data, int size)
 	char frame_type = *(char*)data;
 	frame_type = (frame_type >> 4) & 0x0F;
 	
-	return frame_type == 1;
+	return frame_type == SrsCodecVideoAVCFrameKeyFrame;
 }
 
 bool SrsCodec::video_is_sequence_header(int8_t* data, int size)
 {
-	// E.4.3.1 VIDEODATA
-	// Frame Type UB [4]
-	// Type of video frame. The following values are defined:
-	// 	1 = key frame (for AVC, a seekable frame)
-	// 	2 = inter frame (for AVC, a non-seekable frame)
-	// 	3 = disposable inter frame (H.263 only)
-	// 	4 = generated key frame (reserved for server use only)
-	// 	5 = video info/command frame
-	//
-	// AVCPacketType IF CodecID == 7 UI8
-	// The following values are defined:
-	// 	0 = AVC sequence header
-	// 	1 = AVC NALU
-	// 	2 = AVC end of sequence (lower level NALU sequence ender is
-	// 		not required or supported)
-	
 	// sequence header only for h264
 	if (!video_is_h264(data, size)) {
 		return false;
@@ -93,16 +129,12 @@ bool SrsCodec::video_is_sequence_header(int8_t* data, int size)
 
 	char avc_packet_type = *(char*)(data + 1);
 	
-	return frame_type == 1 && avc_packet_type == 0;
+	return frame_type == SrsCodecVideoAVCFrameKeyFrame 
+		&& avc_packet_type == SrsCodecVideoAVCTypeSequenceHeader;
 }
 
 bool SrsCodec::audio_is_sequence_header(int8_t* data, int size)
 {
-	// AACPacketType IF SoundFormat == 10 UI8
-	// The following values are defined:
-	// 	0 = AAC sequence header
-	// 	1 = AAC raw
-	
 	// sequence header only for aac
 	if (!audio_is_aac(data, size)) {
 		return false;
@@ -115,21 +147,11 @@ bool SrsCodec::audio_is_sequence_header(int8_t* data, int size)
 	
 	char aac_packet_type = *(char*)(data + 1);
 	
-	return aac_packet_type == 0;
+	return aac_packet_type == SrsCodecAudioTypeSequenceHeader;
 }
 
 bool SrsCodec::video_is_h264(int8_t* data, int size)
 {
-	// E.4.3.1 VIDEODATA
-	// CodecID UB [4]
-	// Codec Identifier. The following values are defined:
-	// 	2 = Sorenson H.263
-	// 	3 = Screen video
-	// 	4 = On2 VP6
-	// 	5 = On2 VP6 with alpha channel
-	// 	6 = Screen video version 2
-	// 	7 = AVC
-	
 	// 1bytes required.
 	if (size < 1) {
 		return false;
@@ -138,31 +160,11 @@ bool SrsCodec::video_is_h264(int8_t* data, int size)
 	char codec_id = *(char*)data;
 	codec_id = codec_id & 0x0F;
 	
-	return codec_id == 7;
+	return codec_id == SrsCodecVideoAVC;
 }
 
 bool SrsCodec::audio_is_aac(int8_t* data, int size)
 {
-	// SoundFormat UB [4] 
-	// Format of SoundData. The following values are defined:
-	// 	0 = Linear PCM, platform endian
-	// 	1 = ADPCM
-	// 	2 = MP3
-	// 	3 = Linear PCM, little endian
-	// 	4 = Nellymoser 16 kHz mono
-	// 	5 = Nellymoser 8 kHz mono
-	// 	6 = Nellymoser
-	// 	7 = G.711 A-law logarithmic PCM
-	// 	8 = G.711 mu-law logarithmic PCM
-	// 	9 = reserved
-	// 	10 = AAC
-	// 	11 = Speex
-	// 	14 = MP3 8 kHz
-	// 	15 = Device-specific sound
-	// Formats 7, 8, 14, and 15 are reserved.
-	// AAC is supported in Flash Player 9,0,115,0 and higher.
-	// Speex is supported in Flash Player 10 and higher.
-	
 	// 1bytes required.
 	if (size < 1) {
 		return false;
@@ -171,5 +173,5 @@ bool SrsCodec::audio_is_aac(int8_t* data, int size)
 	char sound_format = *(char*)data;
 	sound_format = (sound_format >> 4) & 0x0F;
 	
-	return sound_format == 10;
+	return sound_format == SrsCodecAudioAAC;
 }

@@ -30,36 +30,170 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 #include <srs_core.hpp>
 
+class SrsStream;
+
+// E.4.3.1 VIDEODATA
+// CodecID UB [4]
+// Codec Identifier. The following values are defined:
+// 	2 = Sorenson H.263
+// 	3 = Screen video
+// 	4 = On2 VP6
+// 	5 = On2 VP6 with alpha channel
+// 	6 = Screen video version 2
+// 	7 = AVC
+enum SrsCodecVideo
+{
+	SrsCodecVideoSorensonH263 			= 2,
+	SrsCodecVideoScreenVideo 			= 3,
+	SrsCodecVideoOn2VP6 				= 4,
+	SrsCodecVideoOn2VP6WithAlphaChannel = 5,
+	SrsCodecVideoScreenVideoVersion2 	= 6,
+	SrsCodecVideoAVC 					= 7,
+};
+
+// E.4.3.1 VIDEODATA
+// Frame Type UB [4]
+// Type of video frame. The following values are defined:
+// 	1 = key frame (for AVC, a seekable frame)
+// 	2 = inter frame (for AVC, a non-seekable frame)
+// 	3 = disposable inter frame (H.263 only)
+// 	4 = generated key frame (reserved for server use only)
+// 	5 = video info/command frame
+enum SrsCodecVideoAVCFrame
+{
+	SrsCodecVideoAVCFrameKeyFrame 					= 1,
+	SrsCodecVideoAVCFrameInterFrame 				= 2,
+	SrsCodecVideoAVCFrameDisposableInterFrame 		= 3,
+	SrsCodecVideoAVCFrameGeneratedKeyFrame			= 4,
+	SrsCodecVideoAVCFrameVideoInfoFrame				= 5,
+};
+
+// AVCPacketType IF CodecID == 7 UI8
+// The following values are defined:
+// 	0 = AVC sequence header
+// 	1 = AVC NALU
+// 	2 = AVC end of sequence (lower level NALU sequence ender is
+// 		not required or supported)
+enum SrsCodecVideoAVCType
+{
+	SrsCodecVideoAVCTypeSequenceHeader 				= 0,
+	SrsCodecVideoAVCTypeNALU 						= 1,
+	SrsCodecVideoAVCTypeSequenceHeaderEOF 			= 2,
+};
+
+// SoundFormat UB [4] 
+// Format of SoundData. The following values are defined:
+// 	0 = Linear PCM, platform endian
+// 	1 = ADPCM
+// 	2 = MP3
+// 	3 = Linear PCM, little endian
+// 	4 = Nellymoser 16 kHz mono
+// 	5 = Nellymoser 8 kHz mono
+// 	6 = Nellymoser
+// 	7 = G.711 A-law logarithmic PCM
+// 	8 = G.711 mu-law logarithmic PCM
+// 	9 = reserved
+// 	10 = AAC
+// 	11 = Speex
+// 	14 = MP3 8 kHz
+// 	15 = Device-specific sound
+// Formats 7, 8, 14, and 15 are reserved.
+// AAC is supported in Flash Player 9,0,115,0 and higher.
+// Speex is supported in Flash Player 10 and higher.
+enum SrsCodecAudio
+{
+	SrsCodecAudioLinearPCMPlatformEndian 			= 0,
+	SrsCodecAudioADPCM 								= 1,
+	SrsCodecAudioMP3 								= 2,
+	SrsCodecAudioLinearPCMLittleEndian 				= 3,
+	SrsCodecAudioNellymoser16kHzMono 				= 4,
+	SrsCodecAudioNellymoser8kHzMono 				= 5,
+	SrsCodecAudioNellymoser 						= 6,
+	SrsCodecAudioReservedG711AlawLogarithmicPCM		= 7,
+	SrsCodecAudioReservedG711MuLawLogarithmicPCM	= 8,
+	SrsCodecAudioReserved 							= 9,
+	SrsCodecAudioAAC 								= 10,
+	SrsCodecAudioSpeex 								= 11,
+	SrsCodecAudioReservedMP3_8kHz 					= 14,
+	SrsCodecAudioReservedDeviceSpecificSound 		= 15,
+};
+
+// AACPacketType IF SoundFormat == 10 UI8
+// The following values are defined:
+// 	0 = AAC sequence header
+// 	1 = AAC raw
+enum SrsCodecAudioType
+{
+	SrsCodecAudioTypeSequenceHeader 				= 0,
+	SrsCodecAudioTypeRawData 						= 1,
+};
+
 /**
 * Annex E. The FLV File Format
 */
 class SrsCodec
 {
+private:
+	SrsStream* stream;
+public:
+	/**
+	* video specified
+	*/
+	int			width;
+	int			height;
+	int			duration;
+	int			frame_rate;
+	// @see: SrsCodecVideo
+	int			video_codec_id;
+	int			video_data_rate; // in bps
+	u_int8_t	profile; // profile_idc, page 45.
+	u_int8_t	level; // level_idc, page 45.
+	/**
+	* audio specified
+	*/
+	int			audio_codec_id;
+	int			audio_data_rate; // in bps
+	int			aac_sample_rate;
+	int			sample_rate; /* 5512, 11025, 22050, 44100 */
+	int			sample_size; /* 1=8bit, 2=16bit */
+	int			audio_channels; /* 1, 2 */
+	// the avc extra data, the AVC sequence header,
+	// without the flv codec header
+	int 		avc_extra_size;
+	char*		avc_extra_data;
+	// the aac extra data, the AAC sequence header,
+	// without the flv codec header
+	int 		aac_extra_size;
+	char*		aac_extra_data;
 public:
 	SrsCodec();
 	virtual ~SrsCodec();
+// the following function used for hls to build the codec info.
+public:
+	virtual int parse_av_codec(bool is_video, int8_t* data, int size);
+// the following function used to finger out the flv/rtmp packet detail.
 public:
 	/**
 	* only check the frame_type, not check the codec type.
 	*/
-	virtual bool video_is_keyframe(int8_t* data, int size);
+	static bool video_is_keyframe(int8_t* data, int size);
 	/**
 	* check codec h264, keyframe, sequence header
 	*/
-	virtual bool video_is_sequence_header(int8_t* data, int size);
+	static bool video_is_sequence_header(int8_t* data, int size);
 	/**
 	* check codec aac, sequence header
 	*/
-	virtual bool audio_is_sequence_header(int8_t* data, int size);
+	static bool audio_is_sequence_header(int8_t* data, int size);
 	/**
 	* check codec h264.
 	*/
-	virtual bool video_is_h264(int8_t* data, int size);
+	static bool video_is_h264(int8_t* data, int size);
 private:
 	/**
 	* check codec aac.
 	*/
-	virtual bool audio_is_aac(int8_t* data, int size);
+	static bool audio_is_aac(int8_t* data, int size);
 };
 
 #endif
\ No newline at end of file

@@ -23,11 +23,117 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 #include <srs_core_hls.hpp>
 
+#include <srs_core_error.hpp>
+#include <srs_core_codec.hpp>
+#include <srs_core_amf0.hpp>
+#include <srs_core_protocol.hpp>
+
 SrsHLS::SrsHLS()
 {
+	codec = new SrsCodec();
 }
 
 SrsHLS::~SrsHLS()
 {
+	srs_freep(codec);
+}
+
+int SrsHLS::on_publish()
+{
+	int ret = ERROR_SUCCESS;
+	return ret;
+}
+
+void SrsHLS::on_unpublish()
+{
+}
+
+int SrsHLS::on_meta_data(SrsOnMetaDataPacket* metadata)
+{
+	int ret = ERROR_SUCCESS;
+
+	if (!metadata || !metadata->metadata) {
+		return ret;
+	}
+	
+	SrsAmf0Object* obj = metadata->metadata;
+	if (obj->size() <= 0) {
+		return ret;
+	}
+	
+	//	finger out the codec info from metadata if possible.
+	SrsAmf0Any* prop = NULL;
+
+	if ((prop = obj->get_property("duration")) != NULL && prop->is_number()) {
+		codec->duration = (int)srs_amf0_convert<SrsAmf0Number>(prop)->value;
+	}
+	if ((prop = obj->get_property("width")) != NULL && prop->is_number()) {
+		codec->width = (int)srs_amf0_convert<SrsAmf0Number>(prop)->value;
+	}
+	if ((prop = obj->get_property("height")) != NULL && prop->is_number()) {
+		codec->height = (int)srs_amf0_convert<SrsAmf0Number>(prop)->value;
+	}
+	if ((prop = obj->get_property("framerate")) != NULL && prop->is_number()) {
+		codec->frame_rate = (int)srs_amf0_convert<SrsAmf0Number>(prop)->value;
+	}
+	if ((prop = obj->get_property("videocodecid")) != NULL && prop->is_number()) {
+		codec->video_codec_id = (int)srs_amf0_convert<SrsAmf0Number>(prop)->value;
+	}
+	if ((prop = obj->get_property("videodatarate")) != NULL && prop->is_number()) {
+		codec->video_data_rate = (int)(1000 * srs_amf0_convert<SrsAmf0Number>(prop)->value);
+	}
+	
+	if ((prop = obj->get_property("audiocodecid")) != NULL && prop->is_number()) {
+		codec->audio_codec_id = (int)srs_amf0_convert<SrsAmf0Number>(prop)->value;
+	}
+	if ((prop = obj->get_property("audiodatarate")) != NULL && prop->is_number()) {
+		codec->audio_data_rate = (int)(1000 * srs_amf0_convert<SrsAmf0Number>(prop)->value);
+	}
+	if ((prop = obj->get_property("audiosamplerate")) != NULL && prop->is_number()) {
+		codec->sample_rate = (int)srs_amf0_convert<SrsAmf0Number>(prop)->value;
+	}
+	if ((prop = obj->get_property("audiosamplesize")) != NULL && prop->is_number()) {
+		codec->sample_size = (int)srs_amf0_convert<SrsAmf0Number>(prop)->value;
+		if (codec->sample_size == 16) {
+			codec->sample_size = 2;
+		} else {
+			codec->sample_size = 1;
+		}
+	}
+	if ((prop = obj->get_property("stereo")) != NULL && prop->is_number()) {
+		if (srs_amf0_convert<SrsAmf0Boolean>(prop)->value) {
+			codec->audio_channels = 2;
+		} else {
+			codec->audio_channels = 1;
+		}
+	}
+	
+	return ret;
+}
+
+int SrsHLS::on_audio(SrsCommonMessage* audio)
+{
+	int ret = ERROR_SUCCESS;
+	
+	if ((ret = codec->parse_av_codec(false, audio->payload, audio->size)) != ERROR_SUCCESS) {
+		return ret;
+	}
+	
+	return ret;
+}
+
+int SrsHLS::on_video(SrsCommonMessage* video)
+{
+	int ret = ERROR_SUCCESS;
+	
+	if ((ret = codec->parse_av_codec(true, video->payload, video->size)) != ERROR_SUCCESS) {
+		return ret;
+	}
+	
+	if (codec->video_codec_id != SrsCodecVideoAVC) {
+		return ret;
+	}
+	
+	return ret;
 }
 

@@ -29,11 +29,23 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
 #include <srs_core.hpp>
 
+class SrsOnMetaDataPacket;
+class SrsCommonMessage;
+class SrsCodec;
+
 class SrsHLS
 {
+private:
+	SrsCodec* codec;
 public:
 	SrsHLS();
 	virtual ~SrsHLS();
+public:
+	virtual int on_publish();
+	virtual void on_unpublish();
+	virtual int on_meta_data(SrsOnMetaDataPacket* metadata);
+	virtual int on_audio(SrsCommonMessage* audio);
+	virtual int on_video(SrsCommonMessage* video);
 };
 
 #endif
\ No newline at end of file

@@ -53,13 +53,11 @@ SrsConsumer::SrsConsumer(SrsSource* _source)
 	source = _source;
 	last_pkt_correct_time = last_pkt_time = 0;
 	paused = false;
-	codec = new SrsCodec();
 }
 
 SrsConsumer::~SrsConsumer()
 {
-	clear();	
-	srs_freep(codec);
+	clear();
 	
 	source->on_consumer_destroy(this);
 }
@@ -141,7 +139,7 @@ void SrsConsumer::shrink()
 		SrsSharedPtrMessage* msg = *it;
 		if (msg->header.is_video()) {
 			has_video = true;
-			if (codec->video_is_keyframe(msg->payload, msg->size)) {
+			if (SrsCodec::video_is_keyframe(msg->payload, msg->size)) {
 				iframe = it;
 				frame_to_remove = i + 1;
 			}
@@ -240,7 +238,6 @@ void SrsConsumer::clear()
 SrsSource::SrsSource(std::string _stream_url)
 {
 	stream_url = _stream_url;
-	codec = new SrsCodec();
 	hls = new SrsHLS();
 	
 	cache_metadata = cache_sh_video = cache_sh_audio = NULL;
@@ -266,7 +263,6 @@ SrsSource::~SrsSource()
 	srs_freep(cache_sh_video);
 	srs_freep(cache_sh_audio);
 	
-	srs_freep(codec);
 	srs_freep(hls);
 }
 
@@ -364,7 +360,7 @@ int SrsSource::on_audio(SrsCommonMessage* audio)
 	srs_info("dispatch audio success.");
 
 	// cache the sequence header if h264
-	if (codec->audio_is_sequence_header(msg->payload, msg->size)) {
+	if (SrsCodec::audio_is_sequence_header(msg->payload, msg->size)) {
 		srs_freep(cache_sh_audio);
 		cache_sh_audio = msg->copy();
 		srs_trace("update audio sequence header success. size=%d", msg->header.payload_length);
@@ -409,7 +405,7 @@ int SrsSource::on_video(SrsCommonMessage* video)
 	srs_info("dispatch video success.");
 
 	// cache the sequence header if h264
-	if (codec->video_is_sequence_header(msg->payload, msg->size)) {
+	if (SrsCodec::video_is_sequence_header(msg->payload, msg->size)) {
 		srs_freep(cache_sh_video);
 		cache_sh_video = msg->copy();
 		srs_trace("update video sequence header success. size=%d", msg->header.payload_length);
@@ -521,7 +517,7 @@ int SrsSource::cache_last_gop(SrsSharedPtrMessage* msg)
 	}
 	
 	// clear gop cache when got key frame
-	if (msg->header.is_video() && codec->video_is_keyframe(msg->payload, msg->size)) {
+	if (msg->header.is_video() && SrsCodec::video_is_keyframe(msg->payload, msg->size)) {
 		srs_info("clear gop cache when got keyframe. vcount=%d, count=%d",
 			cached_video_count, (int)gop_cache.size());
 			

@@ -34,7 +34,6 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include <vector>
 #include <string>
 
-class SrsCodec;
 class SrsSource;
 class SrsCommonMessage;
 class SrsOnMetaDataPacket;
@@ -52,7 +51,6 @@ private:
 	SrsSource* source;
 	std::vector<SrsSharedPtrMessage*> msgs;
 	bool paused;
-	SrsCodec* codec;
 public:
 	SrsConsumer(SrsSource* _source);
 	virtual ~SrsConsumer();
@@ -108,7 +106,6 @@ public:
 	static SrsSource* find(std::string stream_url);
 private:
 	SrsHLS* hls;
-	SrsCodec* codec;
 	std::string stream_url;
 	std::vector<SrsConsumer*> consumers;
 // gop cache for client fast startup.

@@ -106,6 +106,19 @@ int16_t SrsStream::read_2bytes()
 	return value;
 }
 
+int32_t SrsStream::read_3bytes()
+{
+	srs_assert(require(3));
+	
+	int32_t value = 0x00;
+	pp = (char*)&value;
+	pp[2] = *p++;
+	pp[1] = *p++;
+	pp[0] = *p++;
+	
+	return value;
+}
+
 int32_t SrsStream::read_4bytes()
 {
 	srs_assert(require(4));

@@ -84,6 +84,10 @@ public:
 	*/
 	virtual int16_t read_2bytes();
 	/**
+	* get 3bytes int from stream.
+	*/
+	virtual int32_t read_3bytes();
+	/**
 	* get 4bytes int from stream.
 	*/
 	virtual int32_t read_4bytes();