/* * 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. */ #include "MediaSink.h" #include "Extension/AAC.h" //最多等待未初始化的Track 10秒，超时之后会忽略未初始化的Track static size_t constexpr kMaxWaitReadyMS= 10000; //如果直播流只有单Track，最多等待3秒，超时后未收到其他Track的数据，则认为是单Track static size_t constexpr kMaxAddTrackMS = 3000; //如果track未就绪，我们先缓存帧数据，但是有最大个数限制(100帧时大约4秒)，防止内存溢出 static size_t constexpr kMaxUnreadyFrame = 100; namespace mediakit{ bool MediaSink::addTrack(const Track::Ptr &track_in) { GET_CONFIG(bool, enabel_audio, General::kEnableAudio); if (!enabel_audio) { //关闭音频时，加快单视频流注册速度 _max_track_size = 1; if (track_in->getTrackType() == TrackAudio) { //音频被全局忽略 return false; } } else { //是否添加静音音频 GET_CONFIG(bool, addMuteAudio, General::kAddMuteAudio); if (addMuteAudio && track_in->getTrackType() == TrackVideo) { addMuteAudioTrack(); } } lock_guard lck(_mtx); if (_all_track_ready) { WarnL << "all track is ready, add this track too late!"; return false; } //克隆Track，只拷贝其数据，不拷贝其数据转发关系 auto track = track_in->clone(); auto track_type = track->getTrackType(); //确保添加非静音音频track时，取消之前的静音音频track _mute_audio_maker = nullptr; _track_map[track_type] = track; _track_ready_callback[track_type] = [this, track]() { onTrackReady(track); }; _ticker.resetTime(); track->addDelegate(std::make_shared([this](const Frame::Ptr &frame) { if (_all_track_ready) { return onTrackFrame(frame); } auto &frame_unread = _frame_unread[frame->getTrackType()]; if (frame_unread.size() > kMaxUnreadyFrame) { //未就绪的的track，不能缓存太多的帧，否则可能内存溢出 frame_unread.clear(); WarnL << "cached frame of unready track(" << frame->getCodecName() << ") is too much, now cleared"; } //还有Track未就绪，先缓存之 frame_unread.emplace_back(Frame::getCacheAbleFrame(frame)); return true; })); return true; } void MediaSink::resetTracks() { lock_guard lck(_mtx); _all_track_ready = false; _track_map.clear(); _track_ready_callback.clear(); _ticker.resetTime(); _max_track_size = 2; _frame_unread.clear(); } bool MediaSink::inputFrame(const Frame::Ptr &frame) { lock_guard lck(_mtx); auto it = _track_map.find(frame->getTrackType()); if (it == _track_map.end()) { return false; } auto ret = it->second->inputFrame(frame); if (_mute_audio_maker && frame->getTrackType() == TrackVideo) { //视频驱动产生静音音频 _mute_audio_maker->inputFrame(frame); } checkTrackIfReady(nullptr); return ret; } void MediaSink::checkTrackIfReady_l(const Track::Ptr &track){ //Track由未就绪状态转换成就绪状态，我们就触发onTrackReady回调 auto it_callback = _track_ready_callback.find(track->getTrackType()); if (it_callback != _track_ready_callback.end() && track->ready()) { it_callback->second(); _track_ready_callback.erase(it_callback); } } void MediaSink::checkTrackIfReady(const Track::Ptr &track){ if (!_all_track_ready && !_track_ready_callback.empty()) { if (track) { checkTrackIfReady_l(track); } else { for (auto &pr : _track_map) { checkTrackIfReady_l(pr.second); } } } if(!_all_track_ready){ if(_ticker.elapsedTime() > kMaxWaitReadyMS){ //如果超过规定时间，那么不再等待并忽略未准备好的Track emitAllTrackReady(); return; } if(!_track_ready_callback.empty()){ //在超时时间内，如果存在未准备好的Track，那么继续等待 return; } if(_track_map.size() == _max_track_size){ //如果已经添加了音视频Track，并且不存在未准备好的Track，那么说明所有Track都准备好了 emitAllTrackReady(); return; } if(_track_map.size() == 1 && _ticker.elapsedTime() > kMaxAddTrackMS){ //如果只有一个Track，那么在该Track添加后，我们最多还等待若干时间(可能后面还会添加Track) emitAllTrackReady(); return; } } } void MediaSink::addTrackCompleted(){ lock_guard lck(_mtx); _max_track_size = _track_map.size(); checkTrackIfReady(nullptr); } void MediaSink::emitAllTrackReady() { if (_all_track_ready) { return; } DebugL << "all track ready use " << _ticker.elapsedTime() << "ms"; if (!_track_ready_callback.empty()) { //这是超时强制忽略未准备好的Track _track_ready_callback.clear(); //移除未准备好的Track for (auto it = _track_map.begin(); it != _track_map.end();) { if (!it->second->ready()) { WarnL << "track not ready for a long time, ignored: " << it->second->getCodecName(); it = _track_map.erase(it); continue; } ++it; } } if (!_track_map.empty()) { //最少有一个有效的Track _all_track_ready = true; onAllTrackReady(); //全部Track就绪，我们一次性把之前的帧输出 for(auto &pr : _frame_unread){ if (_track_map.find(pr.first) == _track_map.end()) { //该Track已经被移除 continue; } pr.second.for_each([&](const Frame::Ptr &frame) { onTrackFrame(frame); }); } _frame_unread.clear(); } } vector MediaSink::getTracks(bool trackReady) const{ vector ret; lock_guard lck(_mtx); for (auto &pr : _track_map){ if(trackReady && !pr.second->ready()){ continue; } ret.emplace_back(pr.second); } return ret; } class FrameFromStaticPtr : public FrameFromPtr { public: template FrameFromStaticPtr(ARGS &&...args) : FrameFromPtr(std::forward(args)...) {}; ~FrameFromStaticPtr() override = default; bool cacheAble() const override { return true; } }; static uint8_t s_mute_adts[] = {0xff, 0xf1, 0x6c, 0x40, 0x2d, 0x3f, 0xfc, 0x00, 0xe0, 0x34, 0x20, 0xad, 0xf2, 0x3f, 0xb5, 0xdd, 0x73, 0xac, 0xbd, 0xca, 0xd7, 0x7d, 0x4a, 0x13, 0x2d, 0x2e, 0xa2, 0x62, 0x02, 0x70, 0x3c, 0x1c, 0xc5, 0x63, 0x55, 0x69, 0x94, 0xb5, 0x8d, 0x70, 0xd7, 0x24, 0x6a, 0x9e, 0x2e, 0x86, 0x24, 0xea, 0x4f, 0xd4, 0xf8, 0x10, 0x53, 0xa5, 0x4a, 0xb2, 0x9a, 0xf0, 0xa1, 0x4f, 0x2f, 0x66, 0xf9, 0xd3, 0x8c, 0xa6, 0x97, 0xd5, 0x84, 0xac, 0x09, 0x25, 0x98, 0x0b, 0x1d, 0x77, 0x04, 0xb8, 0x55, 0x49, 0x85, 0x27, 0x06, 0x23, 0x58, 0xcb, 0x22, 0xc3, 0x20, 0x3a, 0x12, 0x09, 0x48, 0x24, 0x86, 0x76, 0x95, 0xe3, 0x45, 0x61, 0x43, 0x06, 0x6b, 0x4a, 0x61, 0x14, 0x24, 0xa9, 0x16, 0xe0, 0x97, 0x34, 0xb6, 0x58, 0xa4, 0x38, 0x34, 0x90, 0x19, 0x5d, 0x00, 0x19, 0x4a, 0xc2, 0x80, 0x4b, 0xdc, 0xb7, 0x00, 0x18, 0x12, 0x3d, 0xd9, 0x93, 0xee, 0x74, 0x13, 0x95, 0xad, 0x0b, 0x59, 0x51, 0x0e, 0x99, 0xdf, 0x49, 0x98, 0xde, 0xa9, 0x48, 0x4b, 0xa5, 0xfb, 0xe8, 0x79, 0xc9, 0xe2, 0xd9, 0x60, 0xa5, 0xbe, 0x74, 0xa6, 0x6b, 0x72, 0x0e, 0xe3, 0x7b, 0x28, 0xb3, 0x0e, 0x52, 0xcc, 0xf6, 0x3d, 0x39, 0xb7, 0x7e, 0xbb, 0xf0, 0xc8, 0xce, 0x5c, 0x72, 0xb2, 0x89, 0x60, 0x33, 0x7b, 0xc5, 0xda, 0x49, 0x1a, 0xda, 0x33, 0xba, 0x97, 0x9e, 0xa8, 0x1b, 0x6d, 0x5a, 0x77, 0xb6, 0xf1, 0x69, 0x5a, 0xd1, 0xbd, 0x84, 0xd5, 0x4e, 0x58, 0xa8, 0x5e, 0x8a, 0xa0, 0xc2, 0xc9, 0x22, 0xd9, 0xa5, 0x53, 0x11, 0x18, 0xc8, 0x3a, 0x39, 0xcf, 0x3f, 0x57, 0xb6, 0x45, 0x19, 0x1e, 0x8a, 0x71, 0xa4, 0x46, 0x27, 0x9e, 0xe9, 0xa4, 0x86, 0xdd, 0x14, 0xd9, 0x4d, 0xe3, 0x71, 0xe3, 0x26, 0xda, 0xaa, 0x17, 0xb4, 0xac, 0xe1, 0x09, 0xc1, 0x0d, 0x75, 0xba, 0x53, 0x0a, 0x37, 0x8b, 0xac, 0x37, 0x39, 0x41, 0x27, 0x6a, 0xf0, 0xe9, 0xb4, 0xc2, 0xac, 0xb0, 0x39, 0x73, 0x17, 0x64, 0x95, 0xf4, 0xdc, 0x33, 0xbb, 0x84, 0x94, 0x3e, 0xf8, 0x65, 0x71, 0x60, 0x7b, 0xd4, 0x5f, 0x27, 0x79, 0x95, 0x6a, 0xba, 0x76, 0xa6, 0xa5, 0x9a, 0xec, 0xae, 0x55, 0x3a, 0x27, 0x48, 0x23, 0xcf, 0x5c, 0x4d, 0xbc, 0x0b, 0x35, 0x5c, 0xa7, 0x17, 0xcf, 0x34, 0x57, 0xc9, 0x58, 0xc5, 0x20, 0x09, 0xee, 0xa5, 0xf2, 0x9c, 0x6c, 0x39, 0x1a, 0x77, 0x92, 0x9b, 0xff, 0xc6, 0xae, 0xf8, 0x36, 0xba, 0xa8, 0xaa, 0x6b, 0x1e, 0x8c, 0xc5, 0x97, 0x39, 0x6a, 0xb8, 0xa2, 0x55, 0xa8, 0xf8}; #define MUTE_ADTS_DATA s_mute_adts #define MUTE_ADTS_DATA_LEN sizeof(s_mute_adts) #define MUTE_ADTS_DATA_MS 130 bool MuteAudioMaker::inputFrame(const Frame::Ptr &frame) { if (frame->getTrackType() == TrackVideo) { auto audio_idx = frame->dts() / MUTE_ADTS_DATA_MS; if (_audio_idx != audio_idx) { _audio_idx = audio_idx; auto aacFrame = std::make_shared(CodecAAC, (char *) MUTE_ADTS_DATA, MUTE_ADTS_DATA_LEN, _audio_idx * MUTE_ADTS_DATA_MS, 0, ADTS_HEADER_LEN); return FrameDispatcher::inputFrame(aacFrame); } } return false; } bool MediaSink::addMuteAudioTrack() { if (getTrack(TrackAudio, false)) { WarnL << "audio track already existed"; return false; } if (addTrack(std::make_shared())) { _mute_audio_maker = std::make_shared(); _mute_audio_maker->addDelegate(std::make_shared([this](const Frame::Ptr &frame) { return inputFrame(frame); })); return true; } return false; } }//namespace mediakit