mirror of
https://github.com/ZLMediaKit/ZLMediaKit.git
synced 2024-11-30 07:26:53 +08:00
345 lines
12 KiB
C++
345 lines
12 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/xia-chu/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() {}
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MP4Muxer::~MP4Muxer() {
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closeMP4();
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}
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void MP4Muxer::openMP4(const string &file){
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closeMP4();
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_file_name = file;
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_mp4_file = std::make_shared<MP4FileDisk>();
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_mp4_file->openFile(_file_name.data(), "wb+");
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}
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MP4FileIO::Writer MP4Muxer::createWriter(){
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GET_CONFIG(bool, mp4FastStart, Record::kFastStart);
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return _mp4_file->createWriter(mp4FastStart ? MOV_FLAG_FASTSTART : 0, false);
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}
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void MP4Muxer::closeMP4(){
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MP4MuxerInterface::resetTracks();
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_mp4_file = nullptr;
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}
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void MP4Muxer::resetTracks() {
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MP4MuxerInterface::resetTracks();
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openMP4(_file_name);
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}
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/////////////////////////////////////////// MP4MuxerInterface /////////////////////////////////////////////
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void MP4MuxerInterface::saveSegment(){
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mp4_writer_save_segment(_mov_writter.get());
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}
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void MP4MuxerInterface::initSegment(){
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mp4_writer_init_segment(_mov_writter.get());
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}
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bool MP4MuxerInterface::haveVideo() const{
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return _have_video;
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}
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void MP4MuxerInterface::resetTracks() {
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_started = false;
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_have_video = false;
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_mov_writter = nullptr;
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_frame_merger.clear();
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_codec_to_trackid.clear();
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}
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void MP4MuxerInterface::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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_frame_merger.inputFrame(frame, [&](uint32_t dts, uint32_t pts, const Buffer::Ptr &buffer, bool have_idr) {
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track_info.stamp.revise(dts, pts, dts_out, pts_out);
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mp4_writer_write(_mov_writter.get(),
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track_info.track_id,
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buffer->data(),
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buffer->size(),
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pts_out,
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dts_out,
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have_idr ? MOV_AV_FLAG_KEYFREAME : 0);
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});
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break;
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}
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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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mp4_writer_write(_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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break;
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}
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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 MP4MuxerInterface::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 MP4MuxerInterface::addTrack(const Track::Ptr &track) {
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if (!_mov_writter) {
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_mov_writter = createWriter();
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}
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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 = mp4_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 = mp4_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(), (int)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 = mp4_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(), (int)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 = mp4_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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/////////////////////////////////////////// MP4MuxerMemory /////////////////////////////////////////////
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MP4MuxerMemory::MP4MuxerMemory() {
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_memory_file = std::make_shared<MP4FileMemory>();
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}
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MP4FileIO::Writer MP4MuxerMemory::createWriter() {
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return _memory_file->createWriter(MOV_FLAG_SEGMENT, true);
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}
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const string &MP4MuxerMemory::getInitSegment(){
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if (_init_segment.empty()) {
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initSegment();
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saveSegment();
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_init_segment = _memory_file->getAndClearMemory();
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}
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return _init_segment;
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}
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void MP4MuxerMemory::resetTracks(){
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MP4MuxerInterface::resetTracks();
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_memory_file = std::make_shared<MP4FileMemory>();
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_init_segment.clear();
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}
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void MP4MuxerMemory::inputFrame(const Frame::Ptr &frame){
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if (_init_segment.empty()) {
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//尚未生成init segment
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return;
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}
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bool key_frame = frame->keyFrame();
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if (_ticker.elapsedTime() > 50 || key_frame) {
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//遇到关键帧或者超过50ms则切片
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_ticker.resetTime();
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//flush切片
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saveSegment();
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//输出切片数据
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onSegmentData(_memory_file->getAndClearMemory(), frame->dts(), _key_frame);
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_key_frame = false;
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}
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if (key_frame) {
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_key_frame = true;
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}
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MP4MuxerInterface::inputFrame(frame);
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}
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}//namespace mediakit
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#endif//#ifdef ENABLE_MP4
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