mirror of
https://github.com/ZLMediaKit/ZLMediaKit.git
synced 2024-11-30 07:26:53 +08:00
264 lines
7.9 KiB
C++
264 lines
7.9 KiB
C++
/*
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* Copyright (c) 2016-present The ZLMediaKit project authors. All Rights Reserved.
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*
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* This file is part of ZLMediaKit(https://github.com/ZLMediaKit/ZLMediaKit).
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*
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* Use of this source code is governed by MIT-like 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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#if defined(ENABLE_MP4)
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#include "MP4Muxer.h"
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#include "Common/config.h"
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using namespace std;
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using namespace toolkit;
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namespace mediakit {
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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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uint64_t MP4MuxerInterface::getDuration() const {
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uint64_t ret = 0;
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for (auto &pr : _codec_to_trackid) {
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if (pr.second.stamp.getRelativeStamp() > (int64_t)ret) {
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ret = pr.second.stamp.getRelativeStamp();
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}
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}
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return ret;
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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::flush() {
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_frame_merger.flush();
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}
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bool 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 false;
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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 false;
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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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switch (frame->getCodecId()) {
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case CodecH264:
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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, [this, &track_info](uint64_t dts, uint64_t pts, const Buffer::Ptr &buffer, bool have_idr) {
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int64_t dts_out, pts_out;
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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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int64_t dts_out, pts_out;
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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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return true;
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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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bool 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 = getMovIdByCodec(track->getCodecId());
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if (mp4_object == MOV_OBJECT_NONE) {
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WarnL << "Unsupported codec: " << track->getCodecName();
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return false;
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}
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if (!track->ready()) {
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WarnL << "Track[" << track->getCodecName() << "] unready";
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return false;
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}
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track->update();
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auto extra = track->getExtraData();
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auto extra_data = extra ? extra->data() : nullptr;
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auto extra_size = extra ? extra->size() : 0;
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if (track->getTrackType() == TrackVideo) {
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auto video_track = dynamic_pointer_cast<VideoTrack>(track);
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if (!video_track) {
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WarnL << "不是VideoTrack";
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return false;
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}
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auto track_id = mp4_writer_add_video(_mov_writter.get(), mp4_object, video_track->getVideoWidth(), video_track->getVideoHeight(), extra_data, extra_size);
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if (track_id < 0) {
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WarnL << "添加Video Track失败:" << video_track->getCodecName();
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return false;
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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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} else if (track->getTrackType() == TrackAudio) {
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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 false;
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}
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auto track_id = mp4_writer_add_audio(_mov_writter.get(), mp4_object, audio_track->getAudioChannel(),
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audio_track->getAudioSampleBit() * audio_track->getAudioChannel(),
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audio_track->getAudioSampleRate(), extra_data, extra_size);
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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 false;
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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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//尝试音视频同步
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stampSync();
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return true;
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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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bool 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 false;
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}
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// flush切片
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saveSegment();
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auto data = _memory_file->getAndClearMemory();
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if (!data.empty()) {
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// 输出切片数据
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onSegmentData(std::move(data), _last_dst, _key_frame);
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_key_frame = false;
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}
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if (frame->keyFrame()) {
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_key_frame = true;
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}
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if (frame->getTrackType() == TrackVideo || !haveVideo()) {
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_last_dst = frame->dts();
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}
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return MP4MuxerInterface::inputFrame(frame);
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}
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}//namespace mediakit
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#endif //defined(ENABLE_MP4)
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