mirror of
https://github.com/ZLMediaKit/ZLMediaKit.git
synced 2024-12-02 16:23:02 +08:00
294 lines
11 KiB
C++
294 lines
11 KiB
C++
/*
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* Copyright (c) 2016 The ZLMediaKit project authors. All Rights Reserved.
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*
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* This file is part of ZLMediaKit(https://github.com/xiongziliang/ZLMediaKit).
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*
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* Use of this source code is governed by MIT license that can be found in the
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* LICENSE file in the root of the source tree. All contributing project authors
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* may be found in the AUTHORS file in the root of the source tree.
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*/
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#ifdef ENABLE_MP4
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#include "MP4Muxer.h"
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#include "Util/File.h"
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#include "Extension/H264.h"
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namespace mediakit{
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MP4Muxer::MP4Muxer(const char *file) {
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_file_name = file;
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openMP4();
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}
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MP4Muxer::~MP4Muxer() {
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closeMP4();
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}
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void MP4Muxer::openMP4(){
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closeMP4();
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openFile(_file_name.data(), "wb+");
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_mov_writter = createWriter();
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}
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void MP4Muxer::closeMP4(){
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_mov_writter = nullptr;
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closeFile();
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}
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void MP4Muxer::resetTracks() {
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_codec_to_trackid.clear();
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_started = false;
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_have_video = false;
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openMP4();
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}
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void MP4Muxer::inputFrame(const Frame::Ptr &frame) {
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auto it = _codec_to_trackid.find(frame->getCodecId());
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if(it == _codec_to_trackid.end()){
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//该Track不存在或初始化失败
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return;
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}
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if (!_started) {
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//该逻辑确保含有视频时，第一帧为关键帧
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if (_have_video && !frame->keyFrame()) {
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//含有视频，但是不是关键帧，那么前面的帧丢弃
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return;
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}
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//开始写文件
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_started = true;
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}
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//mp4文件时间戳需要从0开始
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auto &track_info = it->second;
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int64_t dts_out, pts_out;
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switch (frame->getCodecId()) {
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case CodecH264: {
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int type = H264_TYPE(*((uint8_t *)frame->data() + frame->prefixSize()));
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if(type == H264Frame::NAL_SEI){
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break;
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}
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}
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case CodecH265: {
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//这里的代码逻辑是让SPS、PPS、IDR这些时间戳相同的帧打包到一起当做一个帧处理，
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if (!_frameCached.empty() && _frameCached.back()->dts() != frame->dts()) {
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Frame::Ptr back = _frameCached.back();
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//求相对时间戳
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track_info.stamp.revise(back->dts(), back->pts(), dts_out, pts_out);
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if (_frameCached.size() != 1) {
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//缓存中有多帧，需要按照mp4格式合并一起
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string merged;
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_frameCached.for_each([&](const Frame::Ptr &frame) {
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uint32_t nalu_size = frame->size() - frame->prefixSize();
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nalu_size = htonl(nalu_size);
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merged.append((char *) &nalu_size, 4);
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merged.append(frame->data() + frame->prefixSize(), frame->size() - frame->prefixSize());
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});
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mov_writer_write_l(_mov_writter.get(),
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track_info.track_id,
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merged.data(),
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merged.size(),
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pts_out,
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dts_out,
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back->keyFrame() ? MOV_AV_FLAG_KEYFREAME : 0,
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1/*我们合并时已经生成了4个字节的MP4格式start code*/);
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} else {
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//缓存中只有一帧视频
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mov_writer_write_l(_mov_writter.get(),
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track_info.track_id,
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back->data() + back->prefixSize(),
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back->size() - back->prefixSize(),
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pts_out,
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dts_out,
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back->keyFrame() ? MOV_AV_FLAG_KEYFREAME : 0,
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0/*需要生成头4个字节的MP4格式start code*/);
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}
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_frameCached.clear();
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}
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//缓存帧，时间戳相同的帧合并一起写入mp4
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_frameCached.emplace_back(Frame::getCacheAbleFrame(frame));
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}
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break;
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default: {
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track_info.stamp.revise(frame->dts(), frame->pts(), dts_out, pts_out);
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mov_writer_write_l(_mov_writter.get(),
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track_info.track_id,
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frame->data() + frame->prefixSize(),
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frame->size() - frame->prefixSize(),
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pts_out,
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dts_out,
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frame->keyFrame() ? MOV_AV_FLAG_KEYFREAME : 0,
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1/*aac或其他类型frame不用添加4个nalu_size的字节*/);
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}
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break;
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}
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}
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static uint8_t getObject(CodecId codecId){
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switch (codecId){
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case CodecG711A : return MOV_OBJECT_G711a;
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case CodecG711U : return MOV_OBJECT_G711u;
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case CodecOpus : return MOV_OBJECT_OPUS;
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case CodecAAC : return MOV_OBJECT_AAC;
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case CodecH264 : return MOV_OBJECT_H264;
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case CodecH265 : return MOV_OBJECT_HEVC;
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default : return 0;
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}
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}
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void MP4Muxer::stampSync(){
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if(_codec_to_trackid.size() < 2){
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return;
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}
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Stamp *audio = nullptr, *video = nullptr;
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for(auto &pr : _codec_to_trackid){
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switch (getTrackType((CodecId) pr.first)){
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case TrackAudio : audio = &pr.second.stamp; break;
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case TrackVideo : video = &pr.second.stamp; break;
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default : break;
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}
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}
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if(audio && video){
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//音频时间戳同步于视频，因为音频时间戳被修改后不影响播放
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audio->syncTo(*video);
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}
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}
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void MP4Muxer::addTrack(const Track::Ptr &track) {
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auto mp4_object = getObject(track->getCodecId());
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if (!mp4_object) {
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WarnL << "MP4录制不支持该编码格式:" << track->getCodecName();
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return;
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}
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if (!track->ready()) {
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WarnL << "Track[" << track->getCodecName() << "]未就绪";
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return;
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}
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switch (track->getCodecId()) {
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case CodecG711A:
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case CodecG711U:
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case CodecOpus: {
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auto audio_track = dynamic_pointer_cast<AudioTrack>(track);
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if (!audio_track) {
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WarnL << "不是音频Track:" << track->getCodecName();
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return;
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}
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auto track_id = mov_writer_add_audio(_mov_writter.get(),
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mp4_object,
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audio_track->getAudioChannel(),
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audio_track->getAudioSampleBit() * audio_track->getAudioChannel(),
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audio_track->getAudioSampleRate(),
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nullptr, 0);
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if (track_id < 0) {
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WarnL << "添加Track[" << track->getCodecName() << "]失败:" << track_id;
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return;
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}
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_codec_to_trackid[track->getCodecId()].track_id = track_id;
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}
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break;
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case CodecAAC: {
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auto audio_track = dynamic_pointer_cast<AACTrack>(track);
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if (!audio_track) {
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WarnL << "不是AAC Track";
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return;
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}
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auto track_id = mov_writer_add_audio(_mov_writter.get(),
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mp4_object,
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audio_track->getAudioChannel(),
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audio_track->getAudioSampleBit() * audio_track->getAudioChannel(),
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audio_track->getAudioSampleRate(),
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audio_track->getAacCfg().data(),
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audio_track->getAacCfg().size());
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if(track_id < 0){
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WarnL << "添加AAC Track失败:" << track_id;
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return;
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}
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_codec_to_trackid[track->getCodecId()].track_id = track_id;
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}
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break;
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case CodecH264: {
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auto h264_track = dynamic_pointer_cast<H264Track>(track);
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if (!h264_track) {
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WarnL << "不是H264 Track";
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return;
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}
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struct mpeg4_avc_t avc = {0};
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string sps_pps = string("\x00\x00\x00\x01", 4) + h264_track->getSps() +
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string("\x00\x00\x00\x01", 4) + h264_track->getPps();
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h264_annexbtomp4(&avc, sps_pps.data(), sps_pps.size(), NULL, 0, NULL, NULL);
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uint8_t extra_data[1024];
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int extra_data_size = mpeg4_avc_decoder_configuration_record_save(&avc, extra_data, sizeof(extra_data));
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if (extra_data_size == -1) {
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WarnL << "生成H264 extra_data 失败";
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return;
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}
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auto track_id = mov_writer_add_video(_mov_writter.get(),
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mp4_object,
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h264_track->getVideoWidth(),
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h264_track->getVideoHeight(),
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extra_data,
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extra_data_size);
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if(track_id < 0){
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WarnL << "添加H264 Track失败:" << track_id;
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return;
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}
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_codec_to_trackid[track->getCodecId()].track_id = track_id;
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_have_video = true;
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}
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break;
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case CodecH265: {
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auto h265_track = dynamic_pointer_cast<H265Track>(track);
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if (!h265_track) {
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WarnL << "不是H265 Track";
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return;
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}
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struct mpeg4_hevc_t hevc = {0};
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string vps_sps_pps = string("\x00\x00\x00\x01", 4) + h265_track->getVps() +
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string("\x00\x00\x00\x01", 4) + h265_track->getSps() +
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string("\x00\x00\x00\x01", 4) + h265_track->getPps();
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h265_annexbtomp4(&hevc, vps_sps_pps.data(), vps_sps_pps.size(), NULL, 0, NULL, NULL);
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uint8_t extra_data[1024];
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int extra_data_size = mpeg4_hevc_decoder_configuration_record_save(&hevc, extra_data, sizeof(extra_data));
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if (extra_data_size == -1) {
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WarnL << "生成H265 extra_data 失败";
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return;
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}
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auto track_id = mov_writer_add_video(_mov_writter.get(),
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mp4_object,
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h265_track->getVideoWidth(),
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h265_track->getVideoHeight(),
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extra_data,
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extra_data_size);
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if(track_id < 0){
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WarnL << "添加H265 Track失败:" << track_id;
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return;
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}
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_codec_to_trackid[track->getCodecId()].track_id = track_id;
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_have_video = true;
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}
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break;
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default: WarnL << "MP4录制不支持该编码格式:" << track->getCodecName(); break;
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}
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//尝试音视频同步
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stampSync();
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}
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}//namespace mediakit
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#endif//#ifdef ENABLE_MP4
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