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ZLMediaKit
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MP4录制支持多track

This commit is contained in:
xia-chu 2023-12-09 17:13:04 +08:00
parent db86e4a76c
commit 5b95cd1f5a
2 changed files with 46 additions and 70 deletions
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104
src/Record/MP4Muxer.cpp
View File

@ -60,7 +60,7 @@ bool MP4MuxerInterface::haveVideo() const {
uint64_t MP4MuxerInterface::getDuration() const {
uint64_t ret = 0;
for (auto &pr : _codec_to_trackid) {
for (auto &pr : _tracks) {
if (pr.second.stamp.getRelativeStamp() > (int64_t)ret) {
ret = pr.second.stamp.getRelativeStamp();
}
@ -72,61 +72,50 @@ void MP4MuxerInterface::resetTracks() {
_started = false;
_have_video = false;
_mov_writter = nullptr;
_frame_merger.clear();
_codec_to_trackid.clear();
_tracks.clear();
}
void MP4MuxerInterface::flush() {
_frame_merger.flush();
for (auto &pr : _tracks) {
pr.second.merger.flush();
}
}
bool MP4MuxerInterface::inputFrame(const Frame::Ptr &frame) {
auto it = _codec_to_trackid.find(frame->getCodecId());
if (it == _codec_to_trackid.end()) {
//该Track不存在或初始化失败
auto it = _tracks.find(frame->getIndex());
if (it == _tracks.end()) {
// 该Track不存在或初始化失败
return false;
}
if (!_started) {
//该逻辑确保含有视频时，第一帧为关键帧
// 该逻辑确保含有视频时，第一帧为关键帧
if (_have_video && !frame->keyFrame()) {
//含有视频，但是不是关键帧，那么前面的帧丢弃
// 含有视频，但是不是关键帧，那么前面的帧丢弃
return false;
}
//开始写文件
// 开始写文件
_started = true;
}
//mp4文件时间戳需要从0开始
auto &track_info = it->second;
// mp4文件时间戳需要从0开始
auto &track = it->second;
switch (frame->getCodecId()) {
case CodecH264:
case CodecH265: {
//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，
_frame_merger.inputFrame(frame, [this, &track_info](uint64_t dts, uint64_t pts, const Buffer::Ptr &buffer, bool have_idr) {
// 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，
track.merger.inputFrame(frame, [&](uint64_t dts, uint64_t pts, const Buffer::Ptr &buffer, bool have_idr) {
int64_t dts_out, pts_out;
track_info.stamp.revise(dts, pts, dts_out, pts_out);
mp4_writer_write(_mov_writter.get(),
track_info.track_id,
buffer->data(),
buffer->size(),
pts_out,
dts_out,
have_idr ? MOV_AV_FLAG_KEYFREAME : 0);
track.stamp.revise(dts, pts, dts_out, pts_out);
mp4_writer_write(_mov_writter.get(), track.track_id, buffer->data(), buffer->size(), pts_out, dts_out, have_idr ? MOV_AV_FLAG_KEYFREAME : 0);
});
break;
}
default: {
int64_t dts_out, pts_out;
track_info.stamp.revise(frame->dts(), frame->pts(), dts_out, pts_out);
mp4_writer_write(_mov_writter.get(),
track_info.track_id,
frame->data() + frame->prefixSize(),
frame->size() - frame->prefixSize(),
pts_out,
dts_out,
frame->keyFrame() ? MOV_AV_FLAG_KEYFREAME : 0);
track.stamp.revise(frame->dts(), frame->pts(), dts_out, pts_out);
mp4_writer_write(_mov_writter.get(), track.track_id, frame->data() + frame->prefixSize(), frame->size() - frame->prefixSize(), pts_out, dts_out, frame->keyFrame() ? MOV_AV_FLAG_KEYFREAME : 0);
break;
}
}
@ -134,22 +123,13 @@ bool MP4MuxerInterface::inputFrame(const Frame::Ptr &frame) {
}
void MP4MuxerInterface::stampSync() {
if (_codec_to_trackid.size() < 2) {
return;
Stamp *first = nullptr;
for (auto &pr : _tracks) {
if (!first) {
first = &pr.second.stamp;
} else {
pr.second.stamp.syncTo(*first);
}
Stamp *audio = nullptr, *video = nullptr;
for(auto &pr : _codec_to_trackid){
switch (getTrackType((CodecId) pr.first)){
case TrackAudio : audio = &pr.second.stamp; break;
case TrackVideo : video = &pr.second.stamp; break;
default : break;
}
}
if (audio && video) {
//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
audio->syncTo(*video);
}
}
@ -164,7 +144,7 @@ bool MP4MuxerInterface::addTrack(const Track::Ptr &track) {
}
if (!track->ready()) {
WarnL << "Track[" << track->getCodecName() << "] unready";
WarnL << "Track " << track->getCodecName() << " unready";
return false;
}
@ -175,36 +155,26 @@ bool MP4MuxerInterface::addTrack(const Track::Ptr &track) {
auto extra_size = extra ? extra->size() : 0;
if (track->getTrackType() == TrackVideo) {
auto video_track = dynamic_pointer_cast<VideoTrack>(track);
if (!video_track) {
WarnL << "不是VideoTrack";
return false;
}
CHECK(video_track);
auto track_id = mp4_writer_add_video(_mov_writter.get(), mp4_object, video_track->getVideoWidth(), video_track->getVideoHeight(), extra_data, extra_size);
if (track_id < 0) {
WarnL << "添加Video Track失败:" << video_track->getCodecName();
WarnL << "mp4_writer_add_video failed: " << video_track->getCodecName();
return false;
}
_codec_to_trackid[track->getCodecId()].track_id = track_id;
_tracks[track->getIndex()].track_id = track_id;
_have_video = true;
} else if (track->getTrackType() == TrackAudio) {
auto audio_track = dynamic_pointer_cast<AudioTrack>(track);
if (!audio_track) {
WarnL << "不是音频Track:" << track->getCodecName();
return false;
}
auto track_id = mp4_writer_add_audio(_mov_writter.get(), mp4_object, audio_track->getAudioChannel(),
audio_track->getAudioSampleBit() * audio_track->getAudioChannel(),
audio_track->getAudioSampleRate(), extra_data, extra_size);
CHECK(audio_track);
auto track_id = mp4_writer_add_audio(_mov_writter.get(), mp4_object, audio_track->getAudioChannel(), audio_track->getAudioSampleBit() * audio_track->getAudioChannel(), audio_track->getAudioSampleRate(), extra_data, extra_size);
if (track_id < 0) {
WarnL << "添加Track[" << track->getCodecName() << "]失败:" << track_id;
WarnL << "mp4_writer_add_audio failed: " << audio_track->getCodecName();
return false;
}
_codec_to_trackid[track->getCodecId()].track_id = track_id;
_tracks[track->getIndex()].track_id = track_id;
}
//尝试音视频同步
// 尝试音视频同步
stampSync();
return true;
}
@ -236,7 +206,7 @@ void MP4MuxerMemory::resetTracks() {
bool MP4MuxerMemory::inputFrame(const Frame::Ptr &frame) {
if (_init_segment.empty()) {
//尚未生成init segment
// 尚未生成init segment
return false;
}
@ -259,5 +229,5 @@ bool MP4MuxerMemory::inputFrame(const Frame::Ptr &frame) {
return MP4MuxerInterface::inputFrame(frame);
}
}//namespace mediakit
#endif //defined(ENABLE_MP4)
} // namespace mediakit
#endif // defined(ENABLE_MP4)

12
src/Record/MP4Muxer.h
View File

@ -72,12 +72,18 @@ private:
bool _started = false;
bool _have_video = false;
MP4FileIO::Writer _mov_writter;
struct track_info {
class FrameMergerImp : public FrameMerger {
public:
FrameMergerImp() : FrameMerger(FrameMerger::mp4_nal_size) {}
};
struct MP4Track {
int track_id = -1;
Stamp stamp;
FrameMergerImp merger;
};
std::unordered_map<int, track_info> _codec_to_trackid;
FrameMerger _frame_merger { FrameMerger::mp4_nal_size };
std::unordered_map<int, MP4Track> _tracks;
};
class MP4Muxer : public MP4MuxerInterface{