diff --git a/flv/http_flv.go b/flv/http_flv.go
index 7a1977f..66accfc 100644
--- a/flv/http_flv.go
+++ b/flv/http_flv.go
@@ -33,6 +33,7 @@ func (t *TransStream) Input(packet utils.AVPacket) ([][]byte, int64, bool, error
 	var videoKey bool
 	var dts int64
 	var pts int64
+	var keyBuffer bool
 
 	dts = packet.ConvertDts(1000)
 	pts = packet.ConvertPts(1000)
@@ -48,8 +49,9 @@ func (t *TransStream) Input(packet utils.AVPacket) ([][]byte, int64, bool, error
 
 	// 关键帧都放在切片头部，所以遇到关键帧创建新切片, 发送当前切片剩余流
 	if videoKey && !t.MWBuffer.IsNewSegment() {
-		segment := t.forceFlushSegment()
+		segment, key := t.forceFlushSegment()
 		t.AppendOutStreamBuffer(segment)
+		keyBuffer = key
 	}
 
 	var n int
@@ -73,12 +75,13 @@ func (t *TransStream) Input(packet utils.AVPacket) ([][]byte, int64, bool, error
 	copy(bytes[n:], data)
 
 	// 合并写满再发
-	if segment := t.MWBuffer.PeekCompletedSegment(); len(segment) > 0 {
+	if segment, key := t.MWBuffer.PeekCompletedSegment(); len(segment) > 0 {
 		// 已经分配末尾换行符内存
+		keyBuffer = key
 		t.AppendOutStreamBuffer(t.FormatSegment(segment))
 	}
 
-	return t.OutBuffer[:t.OutBufferSize], 0, true, nil
+	return t.OutBuffer[:t.OutBufferSize], 0, keyBuffer, nil
 }
 
 func (t *TransStream) AddTrack(track *stream.Track) error {
@@ -91,8 +94,8 @@ func (t *TransStream) AddTrack(track *stream.Track) error {
 	} else if utils.AVMediaTypeVideo == track.Stream.Type() {
 		t.muxer.AddVideoTrack(track.Stream.CodecId())
 
-		t.muxer.AddProperty("width", track.Stream.CodecParameters().Width())
-		t.muxer.AddProperty("height", track.Stream.CodecParameters().Height())
+		t.muxer.MetaData().AddNumberProperty("width", float64(track.Stream.CodecParameters().Width()))
+		t.muxer.MetaData().AddNumberProperty("height", float64(track.Stream.CodecParameters().Height()))
 	}
 	return nil
 }
@@ -157,7 +160,7 @@ func (t *TransStream) Close() ([][]byte, int64, error) {
 
 	// 发送剩余的流
 	if !t.MWBuffer.IsNewSegment() {
-		if segment := t.forceFlushSegment(); len(segment) > 0 {
+		if segment, _ := t.forceFlushSegment(); len(segment) > 0 {
 			t.AppendOutStreamBuffer(segment)
 		}
 	}
@@ -166,16 +169,16 @@ func (t *TransStream) Close() ([][]byte, int64, error) {
 }
 
 // 保存为完整的http-flv切片
-func (t *TransStream) forceFlushSegment() []byte {
+func (t *TransStream) forceFlushSegment() ([]byte, bool) {
 	// 预览末尾换行符
 	t.MWBuffer.Reserve(2)
-	segment := t.MWBuffer.FlushSegment()
-	return t.FormatSegment(segment)
+	segment, key := t.MWBuffer.FlushSegment()
+	return t.FormatSegment(segment), key
 }
 
 // GetHttpFLVBlock 跳过头部的无效数据，返回http-flv块
 func (t *TransStream) GetHttpFLVBlock(data []byte) []byte {
-	return data[t.computeSkipCount(data):]
+	return data[t.computeSkipBytesSize(data):]
 }
 
 // FormatSegment 为切片添加包长和换行符
@@ -184,7 +187,7 @@ func (t *TransStream) FormatSegment(segment []byte) []byte {
 	return t.GetHttpFLVBlock(segment)
 }
 
-func (t *TransStream) computeSkipCount(data []byte) int {
+func (t *TransStream) computeSkipBytesSize(data []byte) int {
 	return int(6 + binary.BigEndian.Uint16(data[4:]))
 }
 
@@ -220,7 +223,7 @@ func (t *TransStream) writeSeparator(dst []byte) {
 
 func NewHttpTransStream() stream.TransStream {
 	return &TransStream{
-		muxer:      libflv.NewMuxer(),
+		muxer:      libflv.NewMuxer(nil),
 		header:     make([]byte, 1024),
 		headerSize: HttpFlvBlockHeaderSize,
 	}
diff --git a/rtc/rtc_sink.go b/rtc/rtc_sink.go
index 744b7e8..ff4678a 100644
--- a/rtc/rtc_sink.go
+++ b/rtc/rtc_sink.go
@@ -30,7 +30,7 @@ func (s *Sink) StartStreaming(transStream stream.TransStream) error {
 
 	// 创建PeerConnection
 	var remoteTrack *webrtc.TrackLocalStaticSample
-	s.tracks = make([]*webrtc.TrackLocalStaticSample, transStream.TrackCount())
+	s.tracks = make([]*webrtc.TrackLocalStaticSample, transStream.TrackSize())
 
 	connection, err := webrtcApi.NewPeerConnection(webrtc.Configuration{})
 	connection.OnICECandidate(func(candidate *webrtc.ICECandidate) {
diff --git a/rtmp/rtmp_stream.go b/rtmp/rtmp_stream.go
index 54ea052..5a76da5 100644
--- a/rtmp/rtmp_stream.go
+++ b/rtmp/rtmp_stream.go
@@ -34,6 +34,7 @@ func (t *transStream) Input(packet utils.AVPacket) ([][]byte, int64, bool, error
 	var chunkPayloadOffset int
 	var dts int64
 	var pts int64
+	var keyBuffer bool
 
 	dts = packet.ConvertDts(1000)
 	pts = packet.ConvertPts(1000)
@@ -55,15 +56,15 @@ func (t *transStream) Input(packet utils.AVPacket) ([][]byte, int64, bool, error
 
 	// 遇到视频关键帧, 发送剩余的流, 创建新切片
 	if videoKey {
-		if segment := t.MWBuffer.FlushSegment(); len(segment) > 0 {
+		if segment, key := t.MWBuffer.FlushSegment(); len(segment) > 0 {
+			keyBuffer = key
 			t.AppendOutStreamBuffer(segment)
 		}
 	}
 
-	// 分配内存
-	// 固定type0
+	// type为0的header大小
 	chunkHeaderSize := 12
-	// type3chunk数量
+	// type为3的chunk数量
 	numChunks := (payloadSize - 1) / t.chunkSize
 	rtmpMsgSize := chunkHeaderSize + payloadSize + numChunks
 	// 如果时间戳超过3字节, 每个chunk都需要多4字节的扩展时间戳
@@ -71,29 +72,32 @@ func (t *transStream) Input(packet utils.AVPacket) ([][]byte, int64, bool, error
 		rtmpMsgSize += (1 + numChunks) * 4
 	}
 
+	// 分配指定大小的内存
 	allocate := t.MWBuffer.Allocate(rtmpMsgSize, dts, videoKey)
 
-	// 写chunk header
+	// 写第一个type为0的chunk header
 	chunk.Length = payloadSize
 	chunk.Timestamp = uint32(dts)
 	n := chunk.MarshalHeader(allocate)
 
-	// 写flv
+	// 封装成flv
 	if videoPkt {
 		n += t.muxer.WriteVideoData(allocate[n:], uint32(ct), packet.KeyFrame(), false)
 	} else {
 		n += t.muxer.WriteAudioData(allocate[n:], false)
 	}
 
+	// 将flv data写入chunk body
 	n += chunk.WriteBody(allocate[n:], data, t.chunkSize, chunkPayloadOffset)
 	utils.Assert(len(allocate) == n)
 
 	// 合并写满了再发
-	if segment := t.MWBuffer.PeekCompletedSegment(); len(segment) > 0 {
+	if segment, key := t.MWBuffer.PeekCompletedSegment(); len(segment) > 0 {
+		keyBuffer = key
 		t.AppendOutStreamBuffer(segment)
 	}
 
-	return t.OutBuffer[:t.OutBufferSize], 0, true, nil
+	return t.OutBuffer[:t.OutBufferSize], 0, keyBuffer, nil
 }
 
 func (t *transStream) ReadExtraData(_ int64) ([][]byte, int64, error) {
diff --git a/rtsp/rtsp_sink.go b/rtsp/rtsp_sink.go
index d7abf0d..1638fb8 100644
--- a/rtsp/rtsp_sink.go
+++ b/rtsp/rtsp_sink.go
@@ -26,12 +26,12 @@ type Sink struct {
 }
 
 func (s *Sink) StartStreaming(transStream stream.TransStream) error {
-	utils.Assert(transStream.TrackCount() > 0)
+	utils.Assert(transStream.TrackSize() > 0)
 	if s.senders != nil {
 		return nil
 	}
 
-	s.senders = make([]*librtp.RtpSender, transStream.TrackCount())
+	s.senders = make([]*librtp.RtpSender, transStream.TrackSize())
 	// sdp回调给sink, sink应答给describe请求
 	if s.cb != nil {
 		s.cb(transStream.(*TransStream).sdp)
diff --git a/stream/mw_buffer.go b/stream/mw_buffer.go
index cf18a93..90e9fc7 100644
--- a/stream/mw_buffer.go
+++ b/stream/mw_buffer.go
@@ -11,21 +11,22 @@ import (
 type MergeWritingBuffer interface {
 	Allocate(size int, ts int64, videoKey bool) []byte
 
-	// PeekCompletedSegment 返回当前完整切片, 如果不满, 返回nil.
-	PeekCompletedSegment() []byte
+	// PeekCompletedSegment 返回当前完整切片, 以及是否是关键帧切片, 未满返回nil.
+	PeekCompletedSegment() ([]byte, bool)
 
-	// FlushSegment 保存当前切片, 创建新的切片
-	FlushSegment() []byte
+	// FlushSegment 生成并返回当前切片, 以及是否是关键帧切片.
+	FlushSegment() ([]byte, bool)
 
+	// IsFull 当前切片已满
 	IsFull(ts int64) bool
 
-	// IsNewSegment 新切片, 还未写数据
+	// IsNewSegment 当前切片是否还未写数据
 	IsNewSegment() bool
 
 	// Reserve 从当前切片中预留指定长度数据
-	Reserve(number int)
+	Reserve(length int)
 
-	// ReadSegmentsFromKeyFrameIndex 从最近的关键帧读取切片
+	// ReadSegmentsFromKeyFrameIndex 返回最近的关键帧切片
 	ReadSegmentsFromKeyFrameIndex(cb func([]byte))
 
 	Capacity() int
@@ -36,6 +37,7 @@ type mwBlock struct {
 	keyVideo  bool
 	buffer    collections.MemoryPool
 	completed bool
+	Time      int64
 }
 
 type mergeWritingBuffer struct {
@@ -45,7 +47,7 @@ type mergeWritingBuffer struct {
 	startTS  int64 // 当前切片的开始时间
 	duration int   // 当前切片时长
 
-	lastKeyFrameIndex int  // 最新关键帧所在切片的索引
+	lastKeyFrameIndex int  // 最近的关键帧所在切片的索引
 	keyFrameCount     int  // 关键帧计数
 	existVideo        bool // 是否存在视频
 
@@ -55,9 +57,9 @@ type mergeWritingBuffer struct {
 
 func (m *mergeWritingBuffer) createMWBlock(videoKey bool) mwBlock {
 	if videoKey {
-		return mwBlock{true, videoKey, collections.NewDirectMemoryPool(m.keyFrameBufferMaxLength), false}
+		return mwBlock{true, videoKey, collections.NewDirectMemoryPool(m.keyFrameBufferMaxLength), false, 0}
 	} else {
-		return mwBlock{true, false, collections.NewDirectMemoryPool(m.nonKeyFrameBufferMaxLength), false}
+		return mwBlock{true, false, collections.NewDirectMemoryPool(m.nonKeyFrameBufferMaxLength), false, 0}
 	}
 }
 
@@ -77,17 +79,18 @@ func (m *mergeWritingBuffer) Allocate(size int, ts int64, videoKey bool) []byte
 
 	utils.Assert(ts != -1)
 
-	//新的切片
+	// 新的切片
 	if m.startTS == -1 {
 		m.startTS = ts
 
 		if m.mwBlocks[m.index].buffer == nil {
-			//创建内存块
+			// 创建内存块
 			m.mwBlocks[m.index] = m.createMWBlock(videoKey)
 		} else {
-			//循环使用
+			// 循环使用
 			m.mwBlocks[m.index].buffer.Clear()
 
+			// 关键帧被覆盖, 减少计数
 			if m.mwBlocks[m.index].keyVideo {
 				m.keyFrameCount--
 			}
@@ -96,14 +99,15 @@ func (m *mergeWritingBuffer) Allocate(size int, ts int64, videoKey bool) []byte
 		m.mwBlocks[m.index].free = false
 		m.mwBlocks[m.index].completed = false
 		m.mwBlocks[m.index].keyVideo = videoKey
+		m.mwBlocks[m.index].Time = ts
 	}
 
 	if videoKey {
-		//请务必确保关键帧帧从新的切片开始
-		//外部遇到关键帧请先调用FlushSegment
+		// 请务必确保关键帧帧从新的切片开始
+		// 外部遇到关键帧请先调用FlushSegment
 		utils.Assert(m.mwBlocks[m.index].buffer.IsEmpty())
-		m.lastKeyFrameIndex = m.index
-		m.keyFrameCount++
+		//m.lastKeyFrameIndex = m.index
+		//m.keyFrameCount++
 	}
 
 	if ts < m.startTS {
@@ -114,49 +118,61 @@ func (m *mergeWritingBuffer) Allocate(size int, ts int64, videoKey bool) []byte
 	return m.mwBlocks[m.index].buffer.Allocate(size)
 }
 
-func (m *mergeWritingBuffer) FlushSegment() []byte {
+func (m *mergeWritingBuffer) FlushSegment() ([]byte, bool) {
 	if !AppConfig.GOPCache || !m.existVideo {
-		return nil
+		return nil, false
 	} else if m.mwBlocks[m.index].buffer == nil || m.mwBlocks[m.index].free {
-		return nil
+		return nil, false
 	}
 
 	data, _ := m.mwBlocks[m.index].buffer.Data()
 	if len(data) == 0 {
-		return nil
+		return nil, false
 	}
 
-	//更新缓冲长度
+	key := m.mwBlocks[m.index].keyVideo
+	if key {
+		m.lastKeyFrameIndex = m.index
+		m.keyFrameCount++
+	}
+
+	// 计算最大切片数据长度，后续创建新切片按照最大长度分配内存空间
 	if m.lastKeyFrameIndex == m.index && m.keyFrameBufferMaxLength < len(data) {
 		m.keyFrameBufferMaxLength = len(data) * 3 / 2
 	} else if m.lastKeyFrameIndex != m.index && m.nonKeyFrameBufferMaxLength < len(data) {
 		m.nonKeyFrameBufferMaxLength = len(data) * 3 / 2
 	}
 
+	// 设置当前切片的完整性
+	m.mwBlocks[m.index].completed = true
+
+	// 分配下一个切片
 	capacity := cap(m.mwBlocks)
 	if m.index+1 == capacity && m.keyFrameCount == 1 {
 		m.grow()
+		capacity = cap(m.mwBlocks)
 	}
 
+	// 计算下一个切片索引
 	m.index = (m.index + 1) % capacity
-	m.mwBlocks[m.index].completed = true
 
+	// 清空下一个切片的标记
 	m.startTS = -1
 	m.duration = 0
 	m.mwBlocks[m.index].free = true
 	m.mwBlocks[m.index].completed = false
-	return data
+	return data, key
 }
 
-func (m *mergeWritingBuffer) PeekCompletedSegment() []byte {
+func (m *mergeWritingBuffer) PeekCompletedSegment() ([]byte, bool) {
 	if !AppConfig.GOPCache || !m.existVideo {
 		data, _ := m.mwBlocks[0].buffer.Data()
 		m.mwBlocks[0].buffer.Clear()
-		return data
+		return data, false
 	}
 
 	if m.duration < AppConfig.MergeWriteLatency {
-		return nil
+		return nil, false
 	}
 
 	return m.FlushSegment()
@@ -174,10 +190,10 @@ func (m *mergeWritingBuffer) IsNewSegment() bool {
 	return m.mwBlocks[m.index].buffer == nil || m.mwBlocks[m.index].free
 }
 
-func (m *mergeWritingBuffer) Reserve(number int) {
+func (m *mergeWritingBuffer) Reserve(length int) {
 	utils.Assert(m.mwBlocks[m.index].buffer != nil)
 
-	_ = m.mwBlocks[m.index].buffer.Allocate(number)
+	_ = m.mwBlocks[m.index].buffer.Allocate(length)
 }
 
 func (m *mergeWritingBuffer) ReadSegmentsFromKeyFrameIndex(cb func([]byte)) {
@@ -185,18 +201,25 @@ func (m *mergeWritingBuffer) ReadSegmentsFromKeyFrameIndex(cb func([]byte)) {
 		return
 	}
 
-	for i := m.lastKeyFrameIndex; i < cap(m.mwBlocks); i++ {
-		if m.mwBlocks[i].buffer == nil || !m.mwBlocks[i].completed {
-			continue
-		}
+	ranges := [2][2]int{{-1, -1}, {-1, -1}}
+	if m.lastKeyFrameIndex <= m.index {
+		ranges[0][0] = m.lastKeyFrameIndex
+		ranges[0][1] = m.index + 1
+	} else {
+		// 回环, 先遍历后面和前面的数据
+		ranges[0][0] = m.lastKeyFrameIndex
+		ranges[0][1] = cap(m.mwBlocks)
 
-		data, _ := m.mwBlocks[i].buffer.Data()
-		cb(data)
+		ranges[1][0] = 0
+		ranges[1][1] = m.index + 1
 	}
 
-	//回调循环使用的头部数据
-	if m.index < m.lastKeyFrameIndex {
-		for i := 0; i < m.index; i++ {
+	for _, index := range ranges {
+		for i := index[0]; i > -1 && i < index[1]; i++ {
+			if m.mwBlocks[i].buffer == nil || !m.mwBlocks[i].completed {
+				break
+			}
+
 			data, _ := m.mwBlocks[i].buffer.Data()
 			cb(data)
 		}
@@ -217,7 +240,7 @@ func NewMergeWritingBuffer(existVideo bool) MergeWritingBuffer {
 	}
 
 	if !existVideo || !AppConfig.GOPCache {
-		blocks[0] = mwBlock{true, false, collections.NewDirectMemoryPool(1024 * 100), false}
+		blocks[0] = mwBlock{true, false, collections.NewDirectMemoryPool(1024 * 100), false, 0}
 	}
 
 	return &mergeWritingBuffer{
diff --git a/stream/source.go b/stream/source.go
index 4081f28..4f834ee 100644
--- a/stream/source.go
+++ b/stream/source.go
@@ -300,7 +300,9 @@ func IsSupportMux(protocol TransStreamProtocol, audioCodecId, videoCodecId utils
 func (s *PublishSource) CreateTransStream(id TransStreamID, protocol TransStreamProtocol, tracks []*Track) (TransStream, error) {
 	log.Sugar.Infof("创建%s-stream source: %s", protocol.String(), s.ID)
 
-	transStream, err := CreateTransStream(s, protocol, tracks)
+	source := SourceManager.Find(s.ID)
+	utils.Assert(source != nil)
+	transStream, err := CreateTransStream(source, protocol, tracks)
 	if err != nil {
 		log.Sugar.Errorf("创建传输流失败 err: %s source: %s", err.Error(), s.ID)
 		return nil, err
@@ -313,7 +315,7 @@ func (s *PublishSource) CreateTransStream(id TransStreamID, protocol TransStream
 	}
 
 	transStream.SetID(id)
-	transStream.SetTransStreamProtocol(protocol)
+	transStream.SetProtocol(protocol)
 
 	// 创建输出流对应的拉流队列
 	s.TransStreamSinks[id] = make(map[SinkID]Sink, 128)
@@ -461,6 +463,15 @@ func (s *PublishSource) doAddSink(sink Sink) bool {
 		return true
 	}
 
+	// 累加拉流计数
+	if s.recordSink != sink {
+		s.sinkCount++
+		log.Sugar.Infof("sink count: %d source: %s", s.sinkCount, s.ID)
+	}
+
+	s.sinks[sink.GetID()] = sink
+	s.TransStreamSinks[transStreamId][sink.GetID()] = sink
+
 	// TCP拉流开启异步发包, 一旦出现网络不好的链路, 其余正常链路不受影响.
 	conn, ok := sink.GetConn().(*transport.Conn)
 	if ok && sink.IsTCPStreaming() && transStream.OutStreamBufferCapacity() > 2 {
@@ -478,15 +489,6 @@ func (s *PublishSource) doAddSink(sink Sink) bool {
 		s.write(sink, 0, data, timestamp)
 	}
 
-	// 累加拉流计数
-	if s.recordSink != sink {
-		s.sinkCount++
-		log.Sugar.Infof("sink count: %d source: %s", s.sinkCount, s.ID)
-	}
-
-	s.sinks[sink.GetID()] = sink
-	s.TransStreamSinks[transStreamId][sink.GetID()] = sink
-
 	// 新建传输流，发送已经缓存的音视频帧
 	if !exist && AppConfig.GOPCache && s.existVideo {
 		s.DispatchGOPBuffer(transStream)
diff --git a/stream/trans_stream.go b/stream/trans_stream.go
index b982279..c3e9e33 100644
--- a/stream/trans_stream.go
+++ b/stream/trans_stream.go
@@ -10,37 +10,42 @@ type TransStream interface {
 
 	SetID(id TransStreamID)
 
+	// Input 封装传输流, 返回合并写块、时间戳、合并写块是否包含视频关键帧
 	Input(packet utils.AVPacket) ([][]byte, int64, bool, error)
 
 	AddTrack(track *Track) error
 
-	TrackCount() int
+	TrackSize() int
 
 	GetTracks() []*Track
 
+	// WriteHeader track添加完毕, 通过调用此函数告知
 	WriteHeader() error
 
 	// GetProtocol 返回输出流协议
 	GetProtocol() TransStreamProtocol
 
-	// ReadExtraData 获取封装后的编码器扩展数据
+	SetProtocol(protocol TransStreamProtocol)
+
+	// ReadExtraData 读取传输流的编码器扩展数据
 	ReadExtraData(timestamp int64) ([][]byte, int64, error)
 
-	// ReadKeyFrameBuffer 读取已经缓存的包含关键视频帧的输出流
+	// ReadKeyFrameBuffer 读取最近的包含视频关键帧的合并写队列
 	ReadKeyFrameBuffer() ([][]byte, int64, error)
 
+	// Close 关闭传输流, 返回还未flush的合并写块
 	Close() ([][]byte, int64, error)
 
+	// ClearOutStreamBuffer 清空传输流的合并写块队列
 	ClearOutStreamBuffer()
 
+	// AppendOutStreamBuffer 添加合并写块到队列
 	AppendOutStreamBuffer(buffer []byte)
 
-	// OutStreamBufferCapacity 返回输出流缓冲区的容量大小, 输出流缓冲区同时作为向sink推流的发送缓冲区, 容量大小决定向sink异步推流的队列大小;
+	// OutStreamBufferCapacity 返回合并写块队列容量大小, 作为sink异步推流的队列大小;
 	OutStreamBufferCapacity() int
 
 	IsExistVideo() bool
-
-	SetTransStreamProtocol(protocol TransStreamProtocol)
 }
 
 type BaseTransStream struct {
@@ -50,8 +55,8 @@ type BaseTransStream struct {
 	ExistVideo bool
 	Protocol   TransStreamProtocol
 
-	OutBuffer     [][]byte // 输出流的返回队列
-	OutBufferSize int
+	OutBuffer     [][]byte // 传输流的合并写块队列
+	OutBufferSize int      // 传输流返合并写块队列大小
 }
 
 func (t *BaseTransStream) GetID() TransStreamID {
@@ -82,6 +87,10 @@ func (t *BaseTransStream) GetProtocol() TransStreamProtocol {
 	return t.Protocol
 }
 
+func (t *BaseTransStream) SetProtocol(protocol TransStreamProtocol) {
+	t.Protocol = protocol
+}
+
 func (t *BaseTransStream) ClearOutStreamBuffer() {
 	t.OutBufferSize = 0
 }
@@ -106,7 +115,7 @@ func (t *BaseTransStream) OutStreamBufferCapacity() int {
 	return 0
 }
 
-func (t *BaseTransStream) TrackCount() int {
+func (t *BaseTransStream) TrackSize() int {
 	return len(t.Tracks)
 }
 
@@ -126,10 +135,6 @@ func (t *BaseTransStream) ReadKeyFrameBuffer() ([][]byte, int64, error) {
 	return nil, 0, nil
 }
 
-func (t *BaseTransStream) SetTransStreamProtocol(protocol TransStreamProtocol) {
-	t.Protocol = protocol
-}
-
 type TCPTransStream struct {
 	BaseTransStream