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Copy pathMP4Reader.cpp
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255 lines (225 loc) · 7.37 KB
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/*
* Copyright (c) 2016 The ZLMediaKit project authors. All Rights Reserved.
*
* This file is part of ZLMediaKit(https://github.com/xia-chu/ZLMediaKit).
*
* Use of this source code is governed by MIT license that can be found in the
* LICENSE file in the root of the source tree. All contributing project authors
* may be found in the AUTHORS file in the root of the source tree.
*/
#ifdef ENABLE_MP4
#include "MP4Reader.h"
#include "Common/config.h"
#include "Thread/WorkThreadPool.h"
using namespace std;
using namespace toolkit;
namespace mediakit {
MP4Reader::MP4Reader(const string &vhost, const string &app, const string &stream_id, const string &file_path) {
_file_path = file_path;
if (_file_path.empty()) {
GET_CONFIG(string, recordPath, Record::kFilePath);
GET_CONFIG(bool, enableVhost, General::kEnableVhost);
if (enableVhost) {
_file_path = vhost + "/" + app + "/" + stream_id;
} else {
_file_path = app + "/" + stream_id;
}
_file_path = File::absolutePath(_file_path, recordPath);
}
_demuxer = std::make_shared<MP4Demuxer>();
_demuxer->openMP4(_file_path);
if (stream_id.empty()) {
return;
}
ProtocolOption option;
//读取mp4文件并流化时，不重复生成mp4/hls文件
option.enable_mp4 = false;
option.enable_hls = false;
_muxer = std::make_shared<MultiMediaSourceMuxer>(vhost, app, stream_id, _demuxer->getDurationMS() / 1000.0f, option);
auto tracks = _demuxer->getTracks(false);
if (tracks.empty()) {
throw std::runtime_error(StrPrinter << "该mp4文件没有有效的track:" << _file_path);
}
for (auto &track : tracks) {
_muxer->addTrack(track);
if (track->getTrackType() == TrackVideo) {
_have_video = true;
}
}
//添加完毕所有track，防止单track情况下最大等待3秒
_muxer->addTrackCompleted();
}
bool MP4Reader::readSample() {
if (_paused) {
//确保暂停时，时间轴不走动
_seek_ticker.resetTime();
return true;
}
bool keyFrame = false;
bool eof = false;
while (!eof && _last_dts < getCurrentStamp()) {
auto frame = _demuxer->readFrame(keyFrame, eof);
if (!frame) {
continue;
}
_last_dts = frame->dts();
if (_muxer) {
_muxer->inputFrame(frame);
}
}
GET_CONFIG(bool, file_repeat, Record::kFileRepeat);
if (eof && (file_repeat || _file_repeat)) {
//需要从头开始看
seekTo(0);
return true;
}
return !eof;
}
bool MP4Reader::readNextSample() {
bool keyFrame = false;
bool eof = false;
auto frame = _demuxer->readFrame(keyFrame, eof);
if (!frame) {
return false;
}
if (_muxer) {
_muxer->inputFrame(frame);
}
setCurrentStamp(frame->dts());
return true;
}
void MP4Reader::stopReadMP4() {
_timer = nullptr;
}
void MP4Reader::startReadMP4(const EventPoller::Ptr &poller_in, uint64_t sample_ms, bool ref_self, bool file_repeat) {
GET_CONFIG(uint32_t, sampleMS, Record::kSampleMS);
auto strong_self = shared_from_this();
if (_muxer) {
_muxer->setMediaListener(strong_self);
//一直读到所有track就绪为止
while (!_muxer->isAllTrackReady() && readNextSample()) {}
}
//未指定线程，那么使用后台线程(读写文件采用后台线程)
auto poller = poller_in ? poller_in : WorkThreadPool::Instance().getPoller();
auto timer_sec = (sample_ms ? sample_ms : sampleMS) / 1000.0f;
//启动定时器
if (ref_self) {
_timer = std::make_shared<Timer>(timer_sec, [strong_self]() {
lock_guard<recursive_mutex> lck(strong_self->_mtx);
return strong_self->readSample();
}, poller);
} else {
weak_ptr<MP4Reader> weak_self = strong_self;
_timer = std::make_shared<Timer>(timer_sec, [weak_self]() {
auto strong_self = weak_self.lock();
if (!strong_self) {
return false;
}
lock_guard<recursive_mutex> lck(strong_self->_mtx);
return strong_self->readSample();
}, poller);
}
_file_repeat = file_repeat;
}
const MP4Demuxer::Ptr &MP4Reader::getDemuxer() const {
return _demuxer;
}
uint32_t MP4Reader::getCurrentStamp() {
return (uint32_t) (_seek_to + !_paused * _speed * _seek_ticker.elapsedTime());
}
void MP4Reader::setCurrentStamp(uint32_t new_stamp) {
auto old_stamp = getCurrentStamp();
_seek_to = new_stamp;
_last_dts = new_stamp;
_seek_ticker.resetTime();
if (old_stamp != new_stamp && _muxer) {
//时间轴未拖动时不操作
_muxer->setTimeStamp(new_stamp);
}
}
bool MP4Reader::seekTo(MediaSource &sender, uint32_t stamp) {
//拖动进度条后应该恢复播放
pause(sender, false);
TraceL << getOriginUrl(sender) << ",stamp:" << stamp;
return seekTo(stamp);
}
bool MP4Reader::pause(MediaSource &sender, bool pause) {
if (_paused == pause) {
return true;
}
//_seek_ticker重新计时，不管是暂停还是seek都不影响总的播放进度
setCurrentStamp(getCurrentStamp());
_paused = pause;
TraceL << getOriginUrl(sender) << ",pause:" << pause;
return true;
}
bool MP4Reader::speed(MediaSource &sender, float speed) {
if (speed < 0.1 && speed > 20) {
WarnL << "播放速度取值范围非法:" << speed;
return false;
}
//设置播放速度后应该恢复播放
pause(sender, false);
if (_speed == speed) {
return true;
}
_speed = speed;
TraceL << getOriginUrl(sender) << ",speed:" << speed;
return true;
}
bool MP4Reader::seekTo(uint32_t stamp_seek) {
lock_guard<recursive_mutex> lck(_mtx);
if (stamp_seek > _demuxer->getDurationMS()) {
//超过文件长度
return false;
}
auto stamp = _demuxer->seekTo(stamp_seek);
if (stamp == -1) {
//seek失败
return false;
}
if (!_have_video) {
//没有视频，不需要搜索关键帧；设置当前时间戳
setCurrentStamp((uint32_t) stamp);
return true;
}
//搜索到下一帧关键帧
bool keyFrame = false;
bool eof = false;
while (!eof) {
auto frame = _demuxer->readFrame(keyFrame, eof);
if (!frame) {
//文件读完了都未找到下一帧关键帧
continue;
}
if (keyFrame || frame->keyFrame() || frame->configFrame()) {
//定位到key帧
if (_muxer) {
_muxer->inputFrame(frame);
}
//设置当前时间戳
setCurrentStamp(frame->dts());
return true;
}
}
return false;
}
bool MP4Reader::close(MediaSource &sender, bool force) {
if (!_muxer || (!force && _muxer->totalReaderCount())) {
return false;
}
_timer.reset();
WarnL << sender.getSchema() << "/" << sender.getVhost() << "/" << sender.getApp() << "/" << sender.getId() << " " << force;
return true;
}
int MP4Reader::totalReaderCount(MediaSource &sender) {
return _muxer ? _muxer->totalReaderCount() : sender.readerCount();
}
MediaOriginType MP4Reader::getOriginType(MediaSource &sender) const {
return MediaOriginType::mp4_vod;
}
string MP4Reader::getOriginUrl(MediaSource &sender) const {
return _file_path;
}
} /* namespace mediakit */
#endif //ENABLE_MP4