mirror of
https://github.com/cnotch/ipchub.git
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125 lines
2.7 KiB
Go
125 lines
2.7 KiB
Go
// Copyright (c) 2019,CAOHONGJU All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package mpegts
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import (
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"fmt"
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"runtime/debug"
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"github.com/cnotch/ipchub/av/codec"
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"github.com/cnotch/queue"
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"github.com/cnotch/xlog"
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)
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// Packetizer 封包器
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type Packetizer interface {
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Packetize(basePts int64, frame *codec.Frame) error
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}
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type emptyPacketizer struct{}
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func (emptyPacketizer) Packetize(basePts int64, frame *codec.Frame) error { return nil }
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// 网络播放时 PTS（Presentation Time Stamp）的延时
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// 影响视频 Tag 的 CTS 和音频的 DTS（Decoding Time Stamp）
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const (
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ptsDelay = 1000
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)
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// Muxer mpegts muxer from av.Frame(H264[+AAC])
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type Muxer struct {
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recvQueue *queue.SyncQueue
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closed bool
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logger *xlog.Logger // 日志对象
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}
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// NewMuxer .
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func NewMuxer(videoMeta *codec.VideoMeta, audioMeta *codec.AudioMeta, tsframeWriter FrameWriter, logger *xlog.Logger) (*Muxer, error) {
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muxer := &Muxer{
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recvQueue: queue.NewSyncQueue(),
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closed: false,
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logger: logger,
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}
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var vp Packetizer = emptyPacketizer{}
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var ap Packetizer = emptyPacketizer{}
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switch videoMeta.Codec {
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case "H264":
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vp = NewH264Packetizer(videoMeta, tsframeWriter)
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default:
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return nil, fmt.Errorf("ts muxer unsupport video codec type:%s", videoMeta.Codec)
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}
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switch audioMeta.Codec {
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case "AAC":
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ap = NewAacPacketizer(audioMeta, tsframeWriter)
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default:
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return nil, fmt.Errorf("ts muxer unsupport audio codec type:%s", videoMeta.Codec)
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}
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go muxer.process(vp, ap)
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return muxer, nil
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}
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// WriteFrame .
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func (muxer *Muxer) WriteFrame(frame *codec.Frame) error {
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muxer.recvQueue.Push(frame)
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return nil
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}
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// Close .
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func (muxer *Muxer) Close() error {
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if muxer.closed {
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return nil
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}
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muxer.closed = true
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muxer.recvQueue.Signal()
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return nil
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}
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func (muxer *Muxer) process(vp, ap Packetizer) {
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defer func() {
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defer func() { // 避免 handler 再 panic
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recover()
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}()
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if r := recover(); r != nil {
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muxer.logger.Errorf("ts muxer routine panic；r = %v \n %s", r, debug.Stack())
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}
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// 尽早通知GC，回收内存
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muxer.recvQueue.Reset()
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}()
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var basePts int64
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for !muxer.closed {
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f := muxer.recvQueue.Pop()
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if f == nil {
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if !muxer.closed {
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muxer.logger.Warn("tsmuxer: receive nil frame")
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}
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continue
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}
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frame := f.(*codec.Frame)
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if basePts == 0 {
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basePts = frame.AbsTimestamp
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}
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switch frame.MediaType {
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case codec.MediaTypeVideo:
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if err := vp.Packetize(basePts, frame); err != nil {
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muxer.logger.Errorf("tsmuxer: muxVideoTag error - %s", err.Error())
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}
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case codec.MediaTypeAudio:
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if err := ap.Packetize(basePts, frame); err != nil {
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muxer.logger.Errorf("tsmuxer: muxAudioTag error - %s", err.Error())
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}
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default:
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}
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}
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}
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