重构合并写实现, TCP流使用异步发送

2025-09-27 03:26:01 +08:00 · 2024-07-10 20:17:37 +08:00
parent e27f12f5a4
commit 99658f417a
14 changed files with 309 additions and 174 deletions
--- a/api.go
+++ b/api.go
@@ -75,7 +75,7 @@ func startApiServer(addr string) {
 	//TCP主动,设置连接地址
 	apiServer.router.HandleFunc("/api/v1/gb28181/source/connect", apiServer.connectGBSource)
 	apiServer.router.HandleFunc("/api/v1/gb28181/source/close", apiServer.closeGBSource)
-	apiServer.router.HandleFunc("/api/v1/gb28181/gc/force", func(writer http.ResponseWriter, request *http.Request) {
+	apiServer.router.HandleFunc("/api/v1/gc/force", func(writer http.ResponseWriter, request *http.Request) {
 		runtime.GC()
 		writer.WriteHeader(http.StatusOK)
 	})
--- a/config.json
+++ b/config.json
@@ -2,6 +2,7 @@
  "gop_cache": true,
  "gop_buffer_size": 8192000,
  "probe_timeout": 2000,
+  "write_timeout": 5000,
  "mw_latency": 350,
  "listen_ip" : "0.0.0.0",
  "public_ip": "192.168.2.148",
@@ -55,14 +56,14 @@
  "hook": {
    "enable": true,
    "timeout": 10,
-    "on_publish": "http://localhost:8081/api/v1/on_publish",
-    "on_publish_done": "http://localhost:8081/api/v1/on_publish_done",
-    "on_play" : "http://localhost:8081/api/v1/on_play",
-    "on_play_done" : "http://localhost:8081/api/on_play_done",
+    "on_publish": "http://localhost:9000/api/v1/hook/on_publish",
+    "on_publish_done": "http://localhost:9000/api/v1/hook/on_publish_done",
+    "on_play" : "http://localhost:9000/api/v1/hook/on_play",
+    "on_play_done" : "http://localhost:9000/api/on_play_done",

-    "on_record": "http://localhost:8081/api/v1/on_reocrd",
-    "on_idle_timeout": "http://localhost:8081/api/v1/on_idle_timeout",
-    "on_receive_timeout": "http://localhost:8081/api/v1/on_recv_timeout"
+    "on_record": "http://localhost:9000/api/v1/hook/on_reocrd",
+    "on_idle_timeout": "http://localhost:9000/api/v1/hook/on_idle_timeout",
+    "on_receive_timeout": "http://localhost:9000/api/v1/hook/on_recv_timeout"
  },

  "log": {
--- a/flv/http_flv.go
+++ b/flv/http_flv.go
@@ -14,21 +14,8 @@ const (
 	HttpFlvBlockLengthSize = 20
 )

-type HttpFlvBlock struct {
-	pktSize   uint32
-	skipCount uint16
-}
-
-var separator []byte
-
-func init() {
-	separator = make([]byte, 2)
-	separator[0] = 0x0D
-	separator[1] = 0x0A
-}
-
 type httpTransStream struct {
-	stream.BaseTransStream
+	stream.TCPTransStream

 	muxer         libflv.Muxer
 	mwBuffer      stream.MergeWritingBuffer
@@ -57,9 +44,9 @@ func (t *httpTransStream) Input(packet utils.AVPacket) error {
 	}

 	//发送剩余数据
-	if videoKey && !t.mwBuffer.IsEmpty() {
+	if videoKey && !t.mwBuffer.IsNewSegment() {
 		t.mwBuffer.Reserve(2)
-		segment := t.mwBuffer.PopSegment()
+		segment := t.mwBuffer.FlushSegment()
 		t.sendUnpackedSegment(segment)
 	}

@@ -67,7 +54,7 @@ func (t *httpTransStream) Input(packet utils.AVPacket) error {
 	var separatorSize int

 	//新的合并写切片, 预留包长字节
-	if t.mwBuffer.IsCompleted() {
+	if t.mwBuffer.IsNewSegment() {
 		separatorSize = HttpFlvBlockLengthSize
 		//10字节描述flv包长, 前2个字节描述无效字节长度
 		n = HttpFlvBlockLengthSize
@@ -79,7 +66,7 @@ func (t *httpTransStream) Input(packet utils.AVPacket) error {
 	}

 	//分配flv block
-	bytes := t.mwBuffer.Allocate(separatorSize + flvSize)
+	bytes := t.mwBuffer.Allocate(separatorSize+flvSize, dts, videoKey)
 	n += t.muxer.Input(bytes[n:], packet.MediaType(), len(data), dts, pts, packet.KeyFrame(), false)
 	copy(bytes[n:], data)

@@ -87,8 +74,7 @@ func (t *httpTransStream) Input(packet utils.AVPacket) error {
 	//每一个合并写切片开始和预留长度所需的字节数
 	//合并写切片末尾加上换行符
 	//长度是16进制字符串
-	segment := t.mwBuffer.PeekCompletedSegment(dts)
-	if len(segment) > 0 {
+	if segment := t.mwBuffer.PeekCompletedSegment(); len(segment) > 0 {
 		t.sendUnpackedSegment(segment)
 	}
 	return nil
@@ -129,24 +115,27 @@ func (t *httpTransStream) computeSkipCount(data []byte) int {
 func (t *httpTransStream) AddSink(sink stream.Sink) error {
 	utils.Assert(t.headerSize > 0)

-	t.BaseTransStream.AddSink(sink)
+	t.TCPTransStream.AddSink(sink)
 	//发送sequence header
 	t.sendSegment(sink, t.header[:t.headerSize])

 	//发送当前内存池已有的合并写切片
-	segmentList := t.mwBuffer.SegmentList()
-	if len(segmentList) > 0 {
+	first := true
+	t.mwBuffer.ReadSegmentsFromKeyFrameIndex(func(bytes []byte) {
+		if first {
 			//修改第一个flv tag的pre tag size
-		binary.BigEndian.PutUint32(segmentList[20:], uint32(t.headerTagSize))
+			binary.BigEndian.PutUint32(bytes[20:], uint32(t.headerTagSize))
+			first = false
+		}

 		//遍历发送合并写切片
 		var index int
-		for ; index < len(segmentList); index += 4 {
-			size := binary.BigEndian.Uint32(segmentList[index:])
-			t.sendSegment(sink, segmentList[index:index+4+int(size)])
+		for ; index < len(bytes); index += 4 {
+			size := binary.BigEndian.Uint32(bytes[index:])
+			t.sendSegment(sink, bytes[index:index+4+int(size)])
 			index += int(size)
 		}
-	}
+	})

 	return nil
 }
@@ -208,8 +197,7 @@ func (t *httpTransStream) WriteHeader() error {

 func (t *httpTransStream) Close() error {
 	//发送剩余的流
-	segment := t.mwBuffer.PopSegment()
-	if len(segment) > 0 {
+	if segment := t.mwBuffer.FlushSegment(); len(segment) > 0 {
 		t.sendUnpackedSegment(segment)
 	}
 	return nil
--- a/flv/ws_conn.go
+++ b/flv/ws_conn.go
@@ -2,6 +2,7 @@ package flv

 import (
 	"github.com/gorilla/websocket"
+	"github.com/yangjiechina/avformat/transport"
 	"net"
 	"time"
 )
@@ -15,6 +16,8 @@ func (w WSConn) Read(b []byte) (n int, err error) {
 }

 func (w WSConn) Write(b []byte) (n int, err error) {
+	//输入http-flv数据
+	//去掉不需要的换行符
 	var offset int
 	for i := 2; i < len(b); i++ {
 		if b[i-2] == 0x0D && b[i-1] == 0x0A {
@@ -31,5 +34,5 @@ func (w WSConn) SetDeadline(t time.Time) error {
 }

 func NewWSConn(conn *websocket.Conn) net.Conn {
-	return &WSConn{conn}
+	return transport.NewConn(&WSConn{conn})
 }
--- a/hls/m3u8.go
+++ b/hls/m3u8.go
@@ -2,7 +2,7 @@ package hls

 import (
 	"bytes"
-	"github.com/yangjiechina/lkm/stream"
+	"github.com/yangjiechina/lkm/collections"
 	"math"
 	"strconv"
 )
@@ -59,7 +59,7 @@ type M3U8Writer interface {
 func NewM3U8Writer(len int) M3U8Writer {
 	return &m3u8Writer{
 		stringBuffer: bytes.NewBuffer(make([]byte, 0, 1024*10)),
-		playlist:     stream.NewQueue(len),
+		playlist:     collections.NewQueue(len),
 	}
 }

@@ -72,7 +72,7 @@ type Segment struct {

 type m3u8Writer struct {
 	stringBuffer *bytes.Buffer
-	playlist     *stream.Queue
+	playlist     *collections.Queue
 }

 func (m *m3u8Writer) AddSegment(duration float32 /*title string,*/, url string, sequence int, path string) {
--- a/jt1078/jt_session.go
+++ b/jt1078/jt_session.go
@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"github.com/yangjiechina/avformat/transport"
 	"github.com/yangjiechina/avformat/utils"
+	"github.com/yangjiechina/lkm/collections"
 	"github.com/yangjiechina/lkm/log"
 	"github.com/yangjiechina/lkm/stream"
 	"net"
@@ -41,8 +42,8 @@ type Session struct {
 	videoIndex    int
 	audioStream   utils.AVStream
 	videoStream   utils.AVStream
-	audioBuffer   stream.MemoryPool
-	videoBuffer   stream.MemoryPool
+	audioBuffer   collections.MemoryPool
+	videoBuffer   collections.MemoryPool
 	rtpPacket     *RtpPacket
 	receiveBuffer *stream.ReceiveBuffer
 }
--- a/main.go
+++ b/main.go
@@ -44,7 +44,7 @@ func init() {
 	}

 	if stream.AppConfig.Rtsp.IsMultiPort() {
-		rtsp.TransportManger = transport.NewTransportManager(uint16(stream.AppConfig.Rtsp.Port[0]), uint16(stream.AppConfig.Rtsp.Port[1]))
+		rtsp.TransportManger = transport.NewTransportManager(uint16(stream.AppConfig.Rtsp.Port[1]), uint16(stream.AppConfig.Rtsp.Port[2]))
 	}

 	indent, _ := json.MarshalIndent(stream.AppConfig, "", "\t")
@@ -59,8 +59,8 @@ func main() {
 			panic(err)
 		}

-		impl := rtmp.NewServer()
-		err = impl.Start(rtmpAddr)
+		server := rtmp.NewServer()
+		err = server.Start(rtmpAddr)
 		if err != nil {
 			panic(err)
 		}
@@ -74,8 +74,8 @@ func main() {
 			panic(rtspAddr)
 		}

-		rtspServer := rtsp.NewServer(stream.AppConfig.Rtsp.Password)
-		err = rtspServer.Start(rtspAddr)
+		server := rtsp.NewServer(stream.AppConfig.Rtsp.Password)
+		err = server.Start(rtspAddr)
 		if err != nil {
 			panic(err)
 		}
@@ -125,10 +125,8 @@ func main() {
 		log.Sugar.Info("启动jt1078服务成功 addr:", jtAddr.String())
 	}

-	loadConfigError := http.ListenAndServe(":19999", nil)
-	if loadConfigError != nil {
-		panic(loadConfigError)
+	err := http.ListenAndServe(":19999", nil)
+	if err != nil {
+		panic(err)
 	}
-
-	select {}
 }
--- a/rtmp/rtmp_stream.go
+++ b/rtmp/rtmp_stream.go
@@ -8,7 +8,7 @@ import (
 )

 type transStream struct {
-	stream.BaseTransStream
+	stream.TCPTransStream

 	chunkSize int

@@ -22,7 +22,7 @@ type transStream struct {
 	//合并写内存泄露问题: 推流结束后, mwBuffer的data一直释放不掉, 只有拉流全部断开之后, 才会释放该内存.
 	//起初怀疑是代码层哪儿有问题, 但是测试发现如果将合并写切片再拷贝一次发送 给sink, 推流结束后，mwBuffer的data内存块释放没问题, 只有拷贝的内存块未释放. 所以排除了代码层造成内存泄露的可能性.
 	//看来是conn在write后还会持有data. 查阅代码发现, 的确如此. 向fd发送数据前buffer会引用data, 但是后续没有赋值为nil, 取消引用. https://github.com/golang/go/blob/d38f1d13fa413436d38d86fe86d6a146be44bb84/src/internal/poll/fd_windows.go#L694
-	mwBuffer stream.MergeWritingBuffer
+	mwBuffer stream.MergeWritingBuffer //合并写同时作为, 用户态的发送缓冲区
 }

 func (t *transStream) Input(packet utils.AVPacket) error {
@@ -62,16 +62,15 @@ func (t *transStream) Input(packet utils.AVPacket) error {
 		payloadSize += chunkPayloadOffset + len(data)
 	}

-	//遇到视频关键帧, 发送剩余的流
+	//遇到视频关键帧, 发送剩余的流, 创建新切片
 	if videoKey {
-		segment := t.mwBuffer.PopSegment()
-		if len(segment) > 0 {
+		if segment := t.mwBuffer.FlushSegment(); len(segment) > 0 {
 			t.SendPacket(segment)
 		}
 	}

 	//分配内存
-	allocate := t.mwBuffer.Allocate(chunkHeaderSize + payloadSize + ((payloadSize - 1) / t.chunkSize))
+	allocate := t.mwBuffer.Allocate(chunkHeaderSize+payloadSize+((payloadSize-1)/t.chunkSize), dts, videoKey)

 	//写rtmp chunk header
 	chunk.Length = payloadSize
@@ -84,11 +83,10 @@ func (t *transStream) Input(packet utils.AVPacket) error {
 	} else {
 		n += t.muxer.WriteAudioData(allocate[chunkHeaderSize:], false)
 	}
-
 	n += chunk.WriteData(allocate[n:], data, t.chunkSize, chunkPayloadOffset)

-	segment := t.mwBuffer.PeekCompletedSegment(dts)
-	if len(segment) > 0 {
+	//合并写满了再发
+	if segment := t.mwBuffer.PeekCompletedSegment(); len(segment) > 0 {
 		t.SendPacket(segment)
 	}
 	return nil
@@ -97,17 +95,14 @@ func (t *transStream) Input(packet utils.AVPacket) error {
 func (t *transStream) AddSink(sink stream.Sink) error {
 	utils.Assert(t.headerSize > 0)

-	t.BaseTransStream.AddSink(sink)
+	t.TCPTransStream.AddSink(sink)
 	//发送sequence header
 	sink.Input(t.header[:t.headerSize])

 	//发送当前内存池已有的合并写切片
-	segmentList := t.mwBuffer.SegmentList()
-	if len(segmentList) > 0 {
-		sink.Input(segmentList)
-		return nil
-	}
-
+	t.mwBuffer.ReadSegmentsFromKeyFrameIndex(func(bytes []byte) {
+		sink.Input(bytes)
+	})
 	return nil
 }

@@ -179,8 +174,7 @@ func (t *transStream) WriteHeader() error {

 func (t *transStream) Close() error {
 	//发送剩余的流
-	segment := t.mwBuffer.PopSegment()
-	if len(segment) > 0 {
+	if segment := t.mwBuffer.FlushSegment(); len(segment) > 0 {
 		t.SendPacket(segment)
 	}
 	return nil
--- a/stream/config.go
+++ b/stream/config.go
@@ -10,6 +10,7 @@ import (
 	"os"
 	"strconv"
 	"strings"
+	"time"
 )

 const (
@@ -221,7 +222,9 @@ func init() {
 type AppConfig_ struct {
 	GOPCache          bool   `json:"gop_cache"`       //是否开启GOP缓存，只缓存一组音视频
 	GOPBufferSize     int    `json:"gop_buffer_size"` //预估GOPBuffer大小, AVPacket缓存池和合并写缓存池都会参考此大小
-	ProbeTimeout   int    `json:"probe_timeout"`
+	ProbeTimeout      int    `json:"probe_timeout"`   //收流解析AVStream的超时时间
+	WriteTimeout      int    `json:"write_timeout"`   //Server向TCP拉流Conn发包的超时时间, 超过该时间, 直接主动断开Conn. 客户端重新拉流的成本小于服务器缓存成本.
+	WriteBufferNumber int    `json:"-"`
 	PublicIP          string `json:"public_ip"`
 	ListenIP          string `json:"listen_ip"`
 	IdleTimeout       int64  `json:"idle_timeout"`    //多长时间没有拉流, 单位秒. 如果开启hook通知, 根据hook响应, 决定是否关闭Source(200-不关闭/非200关闭). 否则会直接关闭Source.
@@ -268,11 +271,17 @@ func SetDefaultConfig(config_ *AppConfig_) {
 	config_.GOPBufferSize = limitInt(4096*1024/8, 2048*1024*10, config_.GOPBufferSize) //最低4M码率 最高160M码率
 	config_.MergeWriteLatency = limitInt(350, 2000, config_.MergeWriteLatency)         //最低缓存350毫秒数据才发送 最高缓存2秒数据才发送
 	config_.ProbeTimeout = limitInt(2000, 5000, config_.MergeWriteLatency)             //2-5秒内必须解析完AVStream
+	config_.WriteTimeout = limitInt(2000, 10000, config_.WriteTimeout)
+	config_.WriteBufferNumber = config_.WriteTimeout/config_.MergeWriteLatency + 1

 	config_.Log.Level = limitInt(int(zapcore.DebugLevel), int(zapcore.FatalLevel), config_.Log.Level)
 	config_.Log.MaxSize = limitMin(1, config_.Log.MaxSize)
 	config_.Log.MaxBackup = limitMin(1, config_.Log.MaxBackup)
 	config_.Log.MaxAge = limitMin(1, config_.Log.MaxAge)
+
+	config_.IdleTimeout *= int64(time.Second)
+	config_.ReceiveTimeout *= int64(time.Second)
+	config_.Hook.Timeout *= int64(time.Second)
 }

 func limitMin(min, value int) int {
--- a/stream/gop_buffer.go
+++ b/stream/gop_buffer.go
@@ -1,6 +1,9 @@
 package stream

-import "github.com/yangjiechina/avformat/utils"
+import (
+	"github.com/yangjiechina/avformat/utils"
+	"github.com/yangjiechina/lkm/collections"
+)

 // GOPBuffer GOP缓存
 type GOPBuffer interface {
@@ -23,13 +26,13 @@ type GOPBuffer interface {
 }

 type streamBuffer struct {
-	buffer             RingBuffer
+	buffer             collections.RingBuffer
 	existVideoKeyFrame bool
 	discardHandler     func(packet utils.AVPacket)
 }

 func NewStreamBuffer() GOPBuffer {
-	return &streamBuffer{buffer: NewRingBuffer(1000), existVideoKeyFrame: false}
+	return &streamBuffer{buffer: collections.NewRingBuffer(1000), existVideoKeyFrame: false}
 }

 func (s *streamBuffer) AddPacket(packet utils.AVPacket) bool {
--- a/stream/mw_buffer.go
+++ b/stream/mw_buffer.go
@@ -1,125 +1,225 @@
 package stream

+import (
+	"github.com/yangjiechina/avformat/utils"
+	"github.com/yangjiechina/lkm/collections"
+)
+
 // MergeWritingBuffer 实现针对RTMP/FLV/HLS等基于TCP传输流的合并写缓存
-// 和GOP缓存一样, 也以视频关键帧为界. 遇到视频关键帧, 发送剩余输出流, 清空buffer
-
+// 包含多个合并写块, 循环使用, 至少需要等到第二个I帧才开始循环. webrtcI帧间隔可能会高达几十秒,
+// 容量根据write_timeout发送超时和合并写时间来计算, write_timeout/mw_latency.如果I帧间隔大于发送超时时间, 则需要创建新的块.
 type MergeWritingBuffer interface {
-	Allocate(size int) []byte
+	Allocate(size int, ts int64, videoKey bool) []byte

-	// PeekCompletedSegment 返回当前完整合并写切片
-	PeekCompletedSegment(ts int64) []byte
+	// PeekCompletedSegment 返回当前完整切片, 如果不满, 返回nil.
+	PeekCompletedSegment() []byte

-	// PopSegment 返回当前合并写切片, 并清空内存池
-	PopSegment() []byte
-
-	// SegmentList 返回所有完整切片
-	SegmentList() []byte
+	// FlushSegment 保存当前切片, 创建新的切片
+	FlushSegment() []byte

 	IsFull(ts int64) bool

-	IsCompleted() bool
+	// IsNewSegment 新切片, 还未写数据
+	IsNewSegment() bool

-	IsEmpty() bool
+	// Reserve 从当前切片中预留指定长度数据
+	Reserve(number int)

-	Reserve(count int)
+	// ReadSegmentsFromKeyFrameIndex 从最近的关键帧读取切片
+	ReadSegmentsFromKeyFrameIndex(cb func([]byte))
 }

 type mergeWritingBuffer struct {
-	transStreamBuffer MemoryPool
+	mwBlocks []collections.MemoryPool

-	segmentOffset int //当前合并写包位于memoryPool的开始偏移量
+	//空闲合并写块
+	freeKeyFrameMWBlocks     collections.LinkedList[collections.MemoryPool]
+	freeNoneKeyFrameMWBlocks collections.LinkedList[collections.MemoryPool]

-	prePacketTS int64 //前一个包的时间戳
+	index    int   //当前切片位于mwBlocks的索引
+	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
+	existVideo        bool //是否存在视频
+
+	keyFrameBufferMaxLength    int
+	nonKeyFrameBufferMaxLength int
+	keyFrameMap                map[int]int
 }

-func (m *mergeWritingBuffer) Allocate(size int) []byte {
-	return m.transStreamBuffer.Allocate(size)
+func (m *mergeWritingBuffer) createMWBlock(videoKey bool) collections.MemoryPool {
+	if videoKey {
+		return collections.NewDirectMemoryPool(m.keyFrameBufferMaxLength)
+	} else {
+		return collections.NewDirectMemoryPool(m.nonKeyFrameBufferMaxLength)
+	}
 }

-func (m *mergeWritingBuffer) PeekCompletedSegment(ts int64) []byte {
-	if !AppConfig.GOPCache {
-		data, _ := m.transStreamBuffer.Data()
-		m.transStreamBuffer.Clear()
-		return data
+func (m *mergeWritingBuffer) grow() {
+	pools := make([]collections.MemoryPool, cap(m.mwBlocks)*3/2)
+	for i := 0; i < cap(m.mwBlocks); i++ {
+		pools[i] = m.mwBlocks[i]
 	}

-	if m.prePacketTS == -1 {
-		m.prePacketTS = ts
+	m.mwBlocks = pools
+}
+
+func (m *mergeWritingBuffer) Allocate(size int, ts int64, videoKey bool) []byte {
+	if !AppConfig.GOPCache || !m.existVideo {
+		return m.mwBlocks[0].Allocate(size)
 	}

-	if ts < m.prePacketTS {
-		m.prePacketTS = ts
+	utils.Assert(ts != -1)
+
+	//新的切片
+	if m.startTS == -1 {
+		if _, ok := m.keyFrameMap[m.index]; ok {
+			delete(m.keyFrameMap, m.index)
 		}

-	if int(ts-m.prePacketTS) < AppConfig.MergeWriteLatency {
+		if m.mwBlocks[m.index] == nil {
+			//创建内存块
+			m.mwBlocks[m.index] = m.createMWBlock(videoKey)
+		} else {
+			//循环使用
+			if !videoKey {
+
+				//I帧间隔长, 不够写一组GOP, 扩容!
+				if len(m.keyFrameMap) < 1 {
+					capacity := len(m.mwBlocks)
+					m.grow()
+					m.index = capacity
+
+					m.mwBlocks[m.index] = m.createMWBlock(videoKey)
+				}
+			}
+
+			m.mwBlocks[m.index].Clear()
+		}
+
+		m.startTS = 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
+		utils.Assert(m.mwBlocks[m.index].IsEmpty())
+		m.lastKeyFrameIndex = m.index
+		m.keyFrameMap[m.index] = m.index
+	}
+
+	if ts < m.startTS {
+		m.startTS = ts
+	}
+
+	m.duration = int(ts - m.startTS)
+	return m.mwBlocks[m.index].Allocate(size)
+}
+
+func (m *mergeWritingBuffer) FlushSegment() []byte {
+	if m.mwBlocks[m.index] == nil {
 		return nil
 	}

-	head, _ := m.transStreamBuffer.Data()
-	data := head[m.segmentOffset:]
+	data, _ := m.mwBlocks[m.index].Data()
+	if len(data) == 0 {
+		return nil
+	}

-	m.segmentOffset = len(head)
-	m.prePacketTS = -1
+	//更新缓冲长度
+	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
+	}

+	m.index = (m.index + 1) % cap(m.mwBlocks)
+	m.startTS = -1
+	m.duration = 0
 	return data
 }

+func (m *mergeWritingBuffer) PeekCompletedSegment() []byte {
+	if !AppConfig.GOPCache || !m.existVideo {
+		data, _ := m.mwBlocks[0].Data()
+		m.mwBlocks[0].Clear()
+		return data
+	}
+
+	if m.duration < AppConfig.MergeWriteLatency {
+		return nil
+	}
+
+	return m.FlushSegment()
+}
+
 func (m *mergeWritingBuffer) IsFull(ts int64) bool {
-	if m.prePacketTS == -1 {
+	if m.startTS == -1 {
 		return false
 	}

-	return int(ts-m.prePacketTS) >= AppConfig.MergeWriteLatency
+	return int(ts-m.startTS) >= AppConfig.MergeWriteLatency
 }

-func (m *mergeWritingBuffer) IsCompleted() bool {
-	data, _ := m.transStreamBuffer.Data()
-	return m.segmentOffset == len(data)
-}
-
-func (m *mergeWritingBuffer) IsEmpty() bool {
-	data, _ := m.transStreamBuffer.Data()
-	return len(data) <= m.segmentOffset
-}
-
-func (m *mergeWritingBuffer) Reserve(count int) {
-	_ = m.transStreamBuffer.Allocate(count)
-}
-
-func (m *mergeWritingBuffer) PopSegment() []byte {
-	if !AppConfig.GOPCache {
-		return nil
+func (m *mergeWritingBuffer) IsNewSegment() bool {
+	if m.mwBlocks[m.index] == nil {
+		return true
 	}

-	head, _ := m.transStreamBuffer.Data()
-	data := head[m.segmentOffset:]
-	m.transStreamBuffer.Clear()
-	m.segmentOffset = 0
-	m.prePacketTS = -1
-	return data
+	data, _ := m.mwBlocks[m.index].Data()
+	return len(data) == 0
 }

-func (m *mergeWritingBuffer) SegmentList() []byte {
-	if !AppConfig.GOPCache {
-		return nil
+func (m *mergeWritingBuffer) Reserve(number int) {
+	utils.Assert(m.mwBlocks[m.index] != nil)
+
+	m.mwBlocks[m.index].Reserve(number)
+}
+
+func (m *mergeWritingBuffer) ReadSegmentsFromKeyFrameIndex(cb func([]byte)) {
+	if m.lastKeyFrameIndex < 0 || m.index == m.lastKeyFrameIndex {
+		return
 	}

-	head, _ := m.transStreamBuffer.Data()
-	return head[:m.segmentOffset]
+	for i := m.lastKeyFrameIndex; i < cap(m.mwBlocks); i++ {
+		if m.mwBlocks[i] == nil {
+			continue
+		}
+
+		data, _ := m.mwBlocks[i].Data()
+		cb(data)
+	}
+
+	//回调循环使用的头部数据
+	if m.index < m.lastKeyFrameIndex {
+		for i := 0; i < m.index; i++ {
+			data, _ := m.mwBlocks[i].Data()
+			cb(data)
+		}
+	}
 }

 func NewMergeWritingBuffer(existVideo bool) MergeWritingBuffer {
 	//开启GOP缓存, 输出流也缓存整个GOP
-	bufferSize := AppConfig.GOPBufferSize
-	if existVideo && !AppConfig.GOPCache {
-		bufferSize = 1024 * 1000
-	} else if !existVideo {
-		bufferSize = 48000 * 10
+	var blocks []collections.MemoryPool
+	if existVideo {
+		blocks = make([]collections.MemoryPool, AppConfig.WriteBufferNumber)
+	} else {
+		blocks = make([]collections.MemoryPool, 1)
+	}
+
+	if !existVideo || !AppConfig.GOPCache {
+		blocks[0] = collections.NewDirectMemoryPool(1024 * 100)
 	}

 	return &mergeWritingBuffer{
-		transStreamBuffer: NewDirectMemoryPool(bufferSize),
-		segmentOffset:     0,
-		prePacketTS:       -1,
+		keyFrameBufferMaxLength:    AppConfig.MergeWriteLatency * 1024 * 2,
+		nonKeyFrameBufferMaxLength: AppConfig.MergeWriteLatency * 1024 / 2,
+		mwBlocks:                   blocks,
+		startTS:                    -1,
+		lastKeyFrameIndex:          -1,
+		existVideo:                 existVideo,
+		keyFrameMap:                make(map[int]int, 5),
 	}
 }
--- a/stream/sink.go
+++ b/stream/sink.go
@@ -64,6 +64,8 @@ type Sink interface {
 	Start()

 	Flush()
+
+	GetConn() net.Conn
 }

 // GenerateSinkId 根据网络地址生成SinkId IPV4使用一个uint64, IPV6使用String
@@ -244,3 +246,7 @@ func (s *BaseSink) Start() {

 func (s *BaseSink) Flush() {
 }
+
+func (s *BaseSink) GetConn() net.Conn {
+	return s.Conn
+}
--- a/stream/source.go
+++ b/stream/source.go
@@ -3,6 +3,7 @@ package stream
 import (
 	"encoding/json"
 	"fmt"
+	"github.com/yangjiechina/lkm/collections"
 	"github.com/yangjiechina/lkm/log"
 	"net"
 	"net/url"
@@ -91,7 +92,7 @@ type Source interface {
 	Close()

 	// FindOrCreatePacketBuffer 查找或者创建AVPacket的内存池
-	FindOrCreatePacketBuffer(index int, mediaType utils.AVMediaType) MemoryPool
+	FindOrCreatePacketBuffer(index int, mediaType utils.AVMediaType) collections.MemoryPool

 	// OnDiscardPacket GOP缓存溢出回调, 释放AVPacket
 	OnDiscardPacket(pkt utils.AVPacket)
@@ -147,7 +148,7 @@ type PublishSource struct {
 	videoTranscoders []transcode.Transcoder    //视频解码器
 	originStreams    StreamManager             //推流的音视频Streams
 	allStreams       StreamManager             //推流Streams+转码器获得的Stream
-	pktBuffers       [8]MemoryPool          //推流每路的AVPacket缓存, AVPacket的data从该内存池中分配. 在GOP缓存溢出时,释放池中内存.
+	pktBuffers       [8]collections.MemoryPool //推流每路的AVPacket缓存, AVPacket的data从该内存池中分配. 在GOP缓存溢出时,释放池中内存.
 	gopBuffer        GOPBuffer                 //GOP缓存, 音频和视频混合使用, 以视频关键帧为界, 缓存第二个视频关键帧时, 释放前一组gop. 如果不存在视频流, 不缓存音频

 	existVideo bool //是否存在视频
@@ -228,21 +229,21 @@ func (s *PublishSource) CreateDefaultOutStreams() {
 }

 // FindOrCreatePacketBuffer 查找或者创建AVPacket的内存池
-func (s *PublishSource) FindOrCreatePacketBuffer(index int, mediaType utils.AVMediaType) MemoryPool {
+func (s *PublishSource) FindOrCreatePacketBuffer(index int, mediaType utils.AVMediaType) collections.MemoryPool {
 	if index >= cap(s.pktBuffers) {
 		panic("流路数过多...")
 	}

 	if s.pktBuffers[index] == nil {
 		if utils.AVMediaTypeAudio == mediaType {
-			s.pktBuffers[index] = NewRbMemoryPool(48000 * 64)
+			s.pktBuffers[index] = collections.NewRbMemoryPool(48000 * 64)
 		} else if AppConfig.GOPCache {
 			//开启GOP缓存
-			s.pktBuffers[index] = NewRbMemoryPool(AppConfig.GOPBufferSize)
+			s.pktBuffers[index] = collections.NewRbMemoryPool(AppConfig.GOPBufferSize)
 		} else {
 			//未开启GOP缓存
 			//1M缓存大小, 单帧绰绰有余
-			s.pktBuffers[index] = NewRbMemoryPool(1024 * 1000)
+			s.pktBuffers[index] = collections.NewRbMemoryPool(1024 * 1000)
 		}
 	}

--- a/stream/trans_stream.go
+++ b/stream/trans_stream.go
@@ -1,7 +1,9 @@
 package stream

 import (
+	"github.com/yangjiechina/avformat/transport"
 	"github.com/yangjiechina/avformat/utils"
+	"github.com/yangjiechina/lkm/log"
 )

 // TransStream 将AVPacket封装成传输流，转发给各个Sink
@@ -97,3 +99,32 @@ func (t *BaseTransStream) SendPacket(data []byte) error {

 	return nil
 }
+
+type TCPTransStream struct {
+	BaseTransStream
+}
+
+func (t *TCPTransStream) AddSink(sink Sink) error {
+	if err := t.BaseTransStream.AddSink(sink); err != nil {
+		return err
+	}
+
+	sink.GetConn().(*transport.Conn).EnableAsyncWriteMode(AppConfig.WriteBufferNumber - 1)
+	return nil
+}
+
+func (t *TCPTransStream) SendPacket(data []byte) error {
+	for _, sink := range t.Sinks {
+		err := sink.Input(data)
+		if err == nil {
+			continue
+		}
+
+		if _, ok := err.(*transport.ZeroWindowSizeError); ok {
+			log.Sugar.Errorf("发送超时, 强制删除 sink:%s", sink.PrintInfo())
+			go sink.Close()
+		}
+	}
+
+	return nil
+}