737 lines
18 KiB
Go
737 lines
18 KiB
Go
/**
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* package mediaserver
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*
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* WebSocket to RTMP 代理服务
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* 接收 Web端 通过 WebSocket 发送的 WebM 数据，转换为 FLV 并推送到 RTMP
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*
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* 技术栈：
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* - WebSocket: gorilla/websocket
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* - WebM 解析: github.com/at-wat/ebml-go
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* - FLV 封装: github.com/yutopp/go-flv
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* - RTMP 推送: 通过内部流管道
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*/
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package mediaserver
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import (
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"bytes"
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"encoding/binary"
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"fmt"
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"io"
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"log"
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"net/http"
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"sync"
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"time"
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"github.com/at-wat/ebml-go"
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"github.com/gorilla/websocket"
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)
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// WebMToRTMPProxy WebSocket to RTMP 代理
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type WebMToRTMPProxy struct {
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rtmpServer *RTMPServer
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upgrader websocket.Upgrader
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sessions map[string]*ProxySession
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sessionsMu sync.RWMutex
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}
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// ProxySession 代理会话
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type ProxySession struct {
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ID string
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StreamID string
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UserID string
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RoomID string
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Conn *websocket.Conn
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Stream *RTMPStream
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StopChan chan struct{}
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StartTime time.Time
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// WebM 解析状态
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webmBuffer *bytes.Buffer
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headerParsed bool
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videoTrackNum uint64
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audioTrackNum uint64
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// 时间戳
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baseTimestamp uint32
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lastTimestamp uint32
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}
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// WebMHeader WebM 文件头信息
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type WebMHeader struct {
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EBMLVersion uint64 `ebml:"EBMLVersion"`
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EBMLReadVersion uint64 `ebml:"EBMLReadVersion"`
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EBMLMaxIDLength uint64 `ebml:"EBMLMaxIDLength"`
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EBMLMaxSizeLength uint64 `ebml:"EBMLMaxSizeLength"`
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DocType string `ebml:"DocType"`
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DocTypeVersion uint64 `ebml:"DocTypeVersion"`
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DocTypeReadVersion uint64 `ebml:"DocTypeReadVersion"`
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}
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// WebMSegment WebM Segment
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type WebMSegment struct {
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Info WebMSegmentInfo `ebml:"Info"`
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Tracks WebMTracks `ebml:"Tracks"`
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Cluster []WebMCluster `ebml:"Cluster"`
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}
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// WebMSegmentInfo Segment 信息
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type WebMSegmentInfo struct {
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TimecodeScale uint64 `ebml:"TimecodeScale"`
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Duration float64 `ebml:"Duration,omitempty"`
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MuxingApp string `ebml:"MuxingApp,omitempty"`
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WritingApp string `ebml:"WritingApp,omitempty"`
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}
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// WebMTracks 轨道信息
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type WebMTracks struct {
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TrackEntry []WebMTrackEntry `ebml:"TrackEntry"`
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}
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// WebMTrackEntry 轨道条目
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type WebMTrackEntry struct {
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TrackNumber uint64 `ebml:"TrackNumber"`
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TrackType uint64 `ebml:"TrackType"` // 1=video, 2=audio
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CodecID string `ebml:"CodecID"`
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Video *WebMVideoTrack `ebml:"Video,omitempty"`
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Audio *WebMAudioTrack `ebml:"Audio,omitempty"`
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}
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// WebMVideoTrack 视频轨道
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type WebMVideoTrack struct {
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PixelWidth uint64 `ebml:"PixelWidth"`
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PixelHeight uint64 `ebml:"PixelHeight"`
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}
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// WebMAudioTrack 音频轨道
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type WebMAudioTrack struct {
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SamplingFrequency float64 `ebml:"SamplingFrequency"`
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Channels uint64 `ebml:"Channels"`
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BitDepth uint64 `ebml:"BitDepth,omitempty"`
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}
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// WebMCluster WebM Cluster
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type WebMCluster struct {
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Timecode uint64 `ebml:"Timecode"`
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SimpleBlock []ebml.Block `ebml:"SimpleBlock,omitempty"`
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}
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// NewWebMToRTMPProxy 创建代理服务
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func NewWebMToRTMPProxy(rtmpServer *RTMPServer) *WebMToRTMPProxy {
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return &WebMToRTMPProxy{
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rtmpServer: rtmpServer,
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upgrader: websocket.Upgrader{
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CheckOrigin: func(r *http.Request) bool {
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return true // 允许跨域
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},
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ReadBufferSize: 1024 * 1024,
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WriteBufferSize: 1024 * 1024,
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},
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sessions: make(map[string]*ProxySession),
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}
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}
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// HandleWebSocket 处理 WebSocket 连接
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func (p *WebMToRTMPProxy) HandleWebSocket(w http.ResponseWriter, r *http.Request) {
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log.Printf("🔌 [WSProxy] 收到 WebSocket 连接请求: %s from %s", r.URL.String(), r.RemoteAddr)
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// 检查 WebSocket 升级头
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if r.Header.Get("Upgrade") != "websocket" {
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log.Printf("❌ [WSProxy] 不是 WebSocket 请求: Upgrade=%s", r.Header.Get("Upgrade"))
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http.Error(w, "Not a WebSocket request", http.StatusBadRequest)
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return
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}
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// 获取参数
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streamID := r.URL.Query().Get("stream_id")
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userID := r.URL.Query().Get("user_id")
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roomID := r.URL.Query().Get("room_id")
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token := r.URL.Query().Get("token")
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log.Printf("📋 [WSProxy] 参数: stream_id=%s user_id=%s room_id=%s token=%v",
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streamID, userID, roomID, token != "")
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if streamID == "" || userID == "" {
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log.Printf("❌ [WSProxy] 缺少必要参数")
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http.Error(w, "Missing stream_id or user_id", http.StatusBadRequest)
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return
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}
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// 验证 token（简化版，生产环境需要更严格的验证）
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if token == "" {
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log.Printf("⚠️ [WSProxy] 缺少 token: stream=%s", streamID)
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}
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// 升级到 WebSocket
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log.Printf("🔄 [WSProxy] 尝试 WebSocket 升级...")
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conn, err := p.upgrader.Upgrade(w, r, nil)
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if err != nil {
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log.Printf("❌ [WSProxy] WebSocket 升级失败: %v (可能原因: 中间件干扰、响应已写入)", err)
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return
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}
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log.Printf("✅ [WSProxy] WebSocket 升级成功 | Stream:%s User:%s Room:%s", streamID, userID, roomID)
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// 获取或创建 RTMP 流
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stream := p.rtmpServer.GetStream(streamID)
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if stream == nil {
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// 自动创建流
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var err error
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stream, err = p.rtmpServer.GenerateStreamURLs(roomID, userID)
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if err != nil {
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log.Printf("❌ [WSProxy] 创建流失败: %v", err)
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conn.Close()
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return
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}
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// 更新 streamID 为实际生成的
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streamID = stream.ID
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}
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// 创建会话
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session := &ProxySession{
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ID: fmt.Sprintf("%s_%d", userID, time.Now().UnixNano()),
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StreamID: streamID,
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UserID: userID,
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RoomID: roomID,
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Conn: conn,
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Stream: stream,
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StopChan: make(chan struct{}),
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StartTime: time.Now(),
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webmBuffer: bytes.NewBuffer(nil),
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headerParsed: false,
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}
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// 注册会话
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p.sessionsMu.Lock()
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p.sessions[session.ID] = session
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p.sessionsMu.Unlock()
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// 激活流
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stream.mu.Lock()
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stream.IsActive = true
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stream.mu.Unlock()
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// 处理连接
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go p.handleSession(session)
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}
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// handleSession 处理会话
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func (p *WebMToRTMPProxy) handleSession(session *ProxySession) {
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log.Printf("▶️ [WSProxy] 开始处理会话 | Stream:%s User:%s", session.StreamID, session.UserID)
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messageCount := 0
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totalBytes := int64(0)
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defer func() {
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// 清理
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p.sessionsMu.Lock()
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delete(p.sessions, session.ID)
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p.sessionsMu.Unlock()
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session.Conn.Close()
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close(session.StopChan)
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// 标记流为非活动
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if session.Stream != nil {
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session.Stream.mu.Lock()
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session.Stream.IsActive = false
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session.Stream.mu.Unlock()
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}
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log.Printf("🔌 [WSProxy] 连接关闭 | Stream:%s User:%s | 收到消息:%d 总字节:%d",
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session.StreamID, session.UserID, messageCount, totalBytes)
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}()
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for {
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select {
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case <-session.StopChan:
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log.Printf("⏹️ [WSProxy] 收到停止信号 | Stream:%s", session.StreamID)
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return
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default:
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}
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// 读取 WebSocket 消息
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messageType, data, err := session.Conn.ReadMessage()
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if err != nil {
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if websocket.IsUnexpectedCloseError(err, websocket.CloseGoingAway, websocket.CloseAbnormalClosure) {
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log.Printf("⚠️ [WSProxy] 读取错误: %v | Stream:%s", err, session.StreamID)
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} else {
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log.Printf("ℹ️ [WSProxy] 连接关闭: %v | Stream:%s", err, session.StreamID)
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}
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return
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}
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messageCount++
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totalBytes += int64(len(data))
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// 记录首次收到消息
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if messageCount == 1 {
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log.Printf("📥 [WSProxy] 首次收到消息 | Stream:%s Type:%d Size:%d", session.StreamID, messageType, len(data))
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}
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// 每 100 条消息记录一次统计
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if messageCount%100 == 0 {
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log.Printf("📊 [WSProxy] 消息统计 | Stream:%s Count:%d TotalBytes:%d", session.StreamID, messageCount, totalBytes)
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}
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if messageType != websocket.BinaryMessage {
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log.Printf("⚠️ [WSProxy] 忽略非二进制消息 | Type:%d", messageType)
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continue
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}
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// 处理 WebM 数据
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if err := p.processWebMData(session, data); err != nil {
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log.Printf("⚠️ [WSProxy] 处理 WebM 数据失败: %v", err)
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}
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}
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}
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// processWebMData 处理 WebM 数据
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func (p *WebMToRTMPProxy) processWebMData(session *ProxySession, data []byte) error {
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// 将数据追加到缓冲区
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session.webmBuffer.Write(data)
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// 尝试解析 WebM 数据
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return p.parseAndConvert(session)
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}
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// parseAndConvert 解析 WebM 并转换为 FLV
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func (p *WebMToRTMPProxy) parseAndConvert(session *ProxySession) error {
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bufData := session.webmBuffer.Bytes()
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if len(bufData) < 4 {
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return nil // 数据不足
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}
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// 检查 EBML 头部
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if !session.headerParsed {
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// 尝试解析头部
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if err := p.parseWebMHeader(session, bufData); err != nil {
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// 头部不完整，等待更多数据
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return nil
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}
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session.headerParsed = true
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log.Printf("📦 [WSProxy] WebM 头部解析完成 | Stream:%s", session.StreamID)
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}
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// 解析 Cluster 并转换
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return p.parseWebMClusters(session)
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}
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// parseWebMHeader 解析 WebM 头部
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func (p *WebMToRTMPProxy) parseWebMHeader(session *ProxySession, data []byte) error {
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reader := bytes.NewReader(data)
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// 解析 EBML 头
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var header struct {
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EBML struct {
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EBMLVersion uint64 `ebml:"EBMLVersion"`
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DocType string `ebml:"DocType"`
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} `ebml:"EBML"`
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}
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if err := ebml.Unmarshal(reader, &header); err != nil {
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return err
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}
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log.Printf("📦 [WSProxy] WebM DocType: %s", header.EBML.DocType)
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return nil
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}
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// parseWebMClusters 解析 WebM Clusters
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func (p *WebMToRTMPProxy) parseWebMClusters(session *ProxySession) error {
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// 简化处理：直接将 WebM 数据转换为 FLV
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// 实际实现需要完整解析 WebM 的 Cluster/SimpleBlock
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bufData := session.webmBuffer.Bytes()
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if len(bufData) < 100 {
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return nil
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}
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// 寻找 Cluster 标记 (0x1F43B675)
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clusterMarker := []byte{0x1F, 0x43, 0xB6, 0x75}
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for {
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idx := bytes.Index(bufData, clusterMarker)
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if idx == -1 || idx+12 > len(bufData) {
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break
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}
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// 解析 Cluster 大小
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sizeStart := idx + 4
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clusterSize, bytesRead := readVarInt(bufData[sizeStart:])
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if bytesRead == 0 {
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break
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}
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totalSize := idx + 4 + bytesRead + int(clusterSize)
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if totalSize > len(bufData) {
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// Cluster 不完整
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break
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}
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// 提取 Cluster 数据
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clusterData := bufData[idx:totalSize]
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// 转换为 FLV 并广播
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if err := p.convertClusterToFLV(session, clusterData); err != nil {
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log.Printf("⚠️ [WSProxy] 转换 Cluster 失败: %v", err)
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}
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// 从缓冲区移除已处理的数据
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bufData = bufData[totalSize:]
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}
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// 更新缓冲区
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session.webmBuffer.Reset()
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session.webmBuffer.Write(bufData)
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return nil
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}
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// readVarInt 读取 EBML 变长整数
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func readVarInt(data []byte) (uint64, int) {
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if len(data) == 0 {
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return 0, 0
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}
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first := data[0]
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var length int
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var mask byte
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switch {
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case first&0x80 != 0:
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length = 1
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mask = 0x7F
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case first&0x40 != 0:
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length = 2
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mask = 0x3F
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case first&0x20 != 0:
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length = 3
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mask = 0x1F
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case first&0x10 != 0:
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length = 4
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mask = 0x0F
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case first&0x08 != 0:
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length = 5
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mask = 0x07
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case first&0x04 != 0:
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length = 6
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mask = 0x03
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case first&0x02 != 0:
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length = 7
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mask = 0x01
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case first&0x01 != 0:
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length = 8
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mask = 0x00
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default:
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return 0, 0
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}
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if len(data) < length {
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return 0, 0
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}
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value := uint64(data[0] & mask)
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for i := 1; i < length; i++ {
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value = (value << 8) | uint64(data[i])
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}
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return value, length
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}
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// convertClusterToFLV 将 WebM Cluster 转换为 FLV 并广播
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func (p *WebMToRTMPProxy) convertClusterToFLV(session *ProxySession, clusterData []byte) error {
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// 解析 Cluster 时间戳
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timecodeMarker := []byte{0xE7} // Timecode element ID
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timecodeIdx := bytes.Index(clusterData, timecodeMarker)
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var timestamp uint32 = session.lastTimestamp
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if timecodeIdx != -1 && timecodeIdx+1 < len(clusterData) {
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tcSize, bytesRead := readVarInt(clusterData[timecodeIdx+1:])
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if bytesRead > 0 && timecodeIdx+1+bytesRead+int(tcSize) <= len(clusterData) {
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tcData := clusterData[timecodeIdx+1+bytesRead : timecodeIdx+1+bytesRead+int(tcSize)]
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for _, b := range tcData {
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timestamp = (timestamp << 8) | uint32(b)
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}
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}
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}
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// 解析 SimpleBlock
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simpleBlockMarker := []byte{0xA3} // SimpleBlock element ID
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blockData := clusterData
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for {
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blockIdx := bytes.Index(blockData, simpleBlockMarker)
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if blockIdx == -1 || blockIdx+1 >= len(blockData) {
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break
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}
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// 解析 block 大小
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sizeStart := blockIdx + 1
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blockSize, bytesRead := readVarInt(blockData[sizeStart:])
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if bytesRead == 0 {
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break
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}
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dataStart := sizeStart + bytesRead
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dataEnd := dataStart + int(blockSize)
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if dataEnd > len(blockData) {
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break
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}
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// 提取 block 内容
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block := blockData[dataStart:dataEnd]
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if len(block) < 4 {
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blockData = blockData[dataEnd:]
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continue
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}
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// 解析 track number（变长）
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trackNum, trackBytes := readVarInt(block)
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if trackBytes == 0 {
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blockData = blockData[dataEnd:]
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continue
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}
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// 解析相对时间戳（2 bytes, big-endian）
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if trackBytes+2 > len(block) {
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blockData = blockData[dataEnd:]
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continue
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}
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relativeTimestamp := binary.BigEndian.Uint16(block[trackBytes : trackBytes+2])
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// 解析 flags (1 byte)
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flagsIdx := trackBytes + 2
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if flagsIdx >= len(block) {
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blockData = blockData[dataEnd:]
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continue
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}
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flags := block[flagsIdx]
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// 帧数据
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frameData := block[flagsIdx+1:]
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if len(frameData) == 0 {
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||
blockData = blockData[dataEnd:]
|
||
continue
|
||
}
|
||
|
||
// 计算绝对时间戳
|
||
absoluteTimestamp := timestamp + uint32(relativeTimestamp)
|
||
session.lastTimestamp = absoluteTimestamp
|
||
|
||
// 判断是视频还是音频（简化：假设 track 1 是视频，track 2 是音频）
|
||
isVideo := trackNum == 1
|
||
isKeyframe := (flags & 0x80) != 0
|
||
|
||
// 创建 FLV tag 并广播
|
||
var flvTag []byte
|
||
if isVideo {
|
||
flvTag = p.createFLVVideoTag(absoluteTimestamp, frameData, isKeyframe)
|
||
} else {
|
||
flvTag = p.createFLVAudioTag(absoluteTimestamp, frameData)
|
||
}
|
||
|
||
if flvTag != nil {
|
||
p.broadcastFLVTag(session, flvTag)
|
||
}
|
||
|
||
blockData = blockData[dataEnd:]
|
||
}
|
||
|
||
return nil
|
||
}
|
||
|
||
// createFLVVideoTag 创建 FLV 视频 tag
|
||
// VP8 -> FLV (需要转换为 H.264，这里简化处理)
|
||
func (p *WebMToRTMPProxy) createFLVVideoTag(timestamp uint32, data []byte, isKeyframe bool) []byte {
|
||
// 注意：VP8 不能直接封装到 FLV，需要转码为 H.264
|
||
// 这里使用一个简化的方案：将 VP8 数据作为自定义格式封装
|
||
// 实际生产环境需要使用 FFmpeg 或硬件编码器进行转码
|
||
|
||
// FLV Video Tag Header:
|
||
// FrameType (4 bits): 1=keyframe, 2=inter frame
|
||
// CodecID (4 bits): 7=AVC (H.264)
|
||
|
||
// 由于 VP8 无法直接放入 FLV，这里使用一个变通方案
|
||
// 将 VP8 数据标记为私有编码格式
|
||
|
||
frameType := byte(2) // inter frame
|
||
if isKeyframe {
|
||
frameType = 1 // keyframe
|
||
}
|
||
|
||
// 使用 CodecID=12 (VP8 - 非标准，仅用于内部传输)
|
||
// 或者可以考虑在服务端进行实时转码
|
||
codecID := byte(12) // 自定义：VP8
|
||
|
||
header := (frameType << 4) | codecID
|
||
|
||
// 构建完整数据
|
||
videoData := make([]byte, 1+len(data))
|
||
videoData[0] = header
|
||
copy(videoData[1:], data)
|
||
|
||
return p.createFLVTag(9, timestamp, videoData) // 9 = video
|
||
}
|
||
|
||
// createFLVAudioTag 创建 FLV 音频 tag
|
||
// Opus -> FLV (需要转换为 AAC，这里简化处理)
|
||
func (p *WebMToRTMPProxy) createFLVAudioTag(timestamp uint32, data []byte) []byte {
|
||
// 注意：Opus 不能直接封装到 FLV，需要转码为 AAC
|
||
// 这里使用简化方案
|
||
|
||
// FLV Audio Tag Header:
|
||
// SoundFormat (4 bits): 10=AAC, 13=Opus (非标准)
|
||
// SoundRate (2 bits): 3=44kHz
|
||
// SoundSize (1 bit): 1=16-bit
|
||
// SoundType (1 bit): 1=stereo
|
||
|
||
// 使用自定义格式标记 Opus
|
||
soundFormat := byte(13) // 自定义：Opus
|
||
soundRate := byte(3) // 44kHz
|
||
soundSize := byte(1) // 16-bit
|
||
soundType := byte(1) // stereo
|
||
|
||
header := (soundFormat << 4) | (soundRate << 2) | (soundSize << 1) | soundType
|
||
|
||
// 构建完整数据
|
||
audioData := make([]byte, 1+len(data))
|
||
audioData[0] = header
|
||
copy(audioData[1:], data)
|
||
|
||
return p.createFLVTag(8, timestamp, audioData) // 8 = audio
|
||
}
|
||
|
||
// createFLVTag 创建 FLV tag
|
||
func (p *WebMToRTMPProxy) createFLVTag(tagType byte, timestamp uint32, data []byte) []byte {
|
||
dataSize := len(data)
|
||
tagSize := 11 + dataSize + 4
|
||
|
||
tag := make([]byte, tagSize)
|
||
|
||
// Tag type
|
||
tag[0] = tagType
|
||
|
||
// Data size (24-bit big-endian)
|
||
tag[1] = byte((dataSize >> 16) & 0xff)
|
||
tag[2] = byte((dataSize >> 8) & 0xff)
|
||
tag[3] = byte(dataSize & 0xff)
|
||
|
||
// Timestamp (24-bit big-endian)
|
||
tag[4] = byte((timestamp >> 16) & 0xff)
|
||
tag[5] = byte((timestamp >> 8) & 0xff)
|
||
tag[6] = byte(timestamp & 0xff)
|
||
|
||
// Timestamp extended
|
||
tag[7] = byte((timestamp >> 24) & 0xff)
|
||
|
||
// Stream ID (always 0)
|
||
tag[8] = 0
|
||
tag[9] = 0
|
||
tag[10] = 0
|
||
|
||
// Data
|
||
copy(tag[11:], data)
|
||
|
||
// Previous tag size
|
||
prevTagSize := 11 + dataSize
|
||
tag[11+dataSize] = byte((prevTagSize >> 24) & 0xff)
|
||
tag[11+dataSize+1] = byte((prevTagSize >> 16) & 0xff)
|
||
tag[11+dataSize+2] = byte((prevTagSize >> 8) & 0xff)
|
||
tag[11+dataSize+3] = byte(prevTagSize & 0xff)
|
||
|
||
return tag
|
||
}
|
||
|
||
// broadcastFLVTag 广播 FLV tag 到订阅者
|
||
func (p *WebMToRTMPProxy) broadcastFLVTag(session *ProxySession, tag []byte) {
|
||
if session.Stream == nil {
|
||
return
|
||
}
|
||
|
||
// 缓存到 GOP
|
||
session.Stream.mu.Lock()
|
||
session.Stream.gopCache = append(session.Stream.gopCache, tag)
|
||
if len(session.Stream.gopCache) > 300 {
|
||
session.Stream.gopCache = session.Stream.gopCache[len(session.Stream.gopCache)-300:]
|
||
}
|
||
session.Stream.mu.Unlock()
|
||
|
||
// 广播到 HTTP-FLV 订阅者
|
||
p.rtmpServer.subMu.RLock()
|
||
subs, exists := p.rtmpServer.subscribers[session.StreamID]
|
||
if exists {
|
||
for _, sub := range subs {
|
||
select {
|
||
case sub.DataChan <- tag:
|
||
default:
|
||
// 缓冲区满，跳过
|
||
}
|
||
}
|
||
}
|
||
p.rtmpServer.subMu.RUnlock()
|
||
}
|
||
|
||
// GetSession 获取会话
|
||
func (p *WebMToRTMPProxy) GetSession(sessionID string) *ProxySession {
|
||
p.sessionsMu.RLock()
|
||
defer p.sessionsMu.RUnlock()
|
||
return p.sessions[sessionID]
|
||
}
|
||
|
||
// GetSessionsByStream 获取流的所有会话
|
||
func (p *WebMToRTMPProxy) GetSessionsByStream(streamID string) []*ProxySession {
|
||
p.sessionsMu.RLock()
|
||
defer p.sessionsMu.RUnlock()
|
||
|
||
sessions := make([]*ProxySession, 0)
|
||
for _, s := range p.sessions {
|
||
if s.StreamID == streamID {
|
||
sessions = append(sessions, s)
|
||
}
|
||
}
|
||
return sessions
|
||
}
|
||
|
||
// CloseSession 关闭会话
|
||
func (p *WebMToRTMPProxy) CloseSession(sessionID string) {
|
||
p.sessionsMu.Lock()
|
||
session, exists := p.sessions[sessionID]
|
||
if exists {
|
||
delete(p.sessions, sessionID)
|
||
}
|
||
p.sessionsMu.Unlock()
|
||
|
||
if session != nil {
|
||
select {
|
||
case <-session.StopChan:
|
||
default:
|
||
close(session.StopChan)
|
||
}
|
||
session.Conn.Close()
|
||
}
|
||
}
|
||
|
||
// CloseAllSessions 关闭所有会话
|
||
func (p *WebMToRTMPProxy) CloseAllSessions() {
|
||
p.sessionsMu.Lock()
|
||
sessions := make([]*ProxySession, 0, len(p.sessions))
|
||
for _, s := range p.sessions {
|
||
sessions = append(sessions, s)
|
||
}
|
||
p.sessions = make(map[string]*ProxySession)
|
||
p.sessionsMu.Unlock()
|
||
|
||
for _, s := range sessions {
|
||
select {
|
||
case <-s.StopChan:
|
||
default:
|
||
close(s.StopChan)
|
||
}
|
||
s.Conn.Close()
|
||
}
|
||
}
|
||
|
||
// 确保导入被使用
|
||
var _ io.Reader = (*bytes.Reader)(nil)
|
||
|