Buffer audio when waiting data in streaming.

20 files changed, 188 insertions, 49 deletions

diff --git a/Telegram/SourceFiles/config.h b/Telegram/SourceFiles/config.h
index 498040e025..4ec78f7e86 100644
--- a/Telegram/SourceFiles/config.h
+++ b/Telegram/SourceFiles/config.h
@@ -48,7 +48,6 @@ enum {
 	AudioVoiceMsgMaxLength = 100 * 60, // 100 minutes
 	AudioVoiceMsgUpdateView = 100, // 100ms
 	AudioVoiceMsgChannels = 2, // stereo
-	AudioVoiceMsgBufferSize = 256 * 1024, // 256 Kb buffers (1.3 - 3.0 secs)
 
 	StickerMaxSize = 2048, // 2048x2048 is a max image size for sticker
 
diff --git a/Telegram/SourceFiles/data/data_document.cpp b/Telegram/SourceFiles/data/data_document.cpp
index ed44df027c..941ee4ce69 100644
--- a/Telegram/SourceFiles/data/data_document.cpp
+++ b/Telegram/SourceFiles/data/data_document.cpp
@@ -326,7 +326,8 @@ void StartStreaming(
 
 		auto options = Media::Streaming::PlaybackOptions();
 		options.speed = 1.;
-		options.position = (document->duration() / 2) * crl::time(1000);
+		//options.syncVideoByAudio = false;
+		//options.position = (document->duration() / 2) * crl::time(1000);
 		player->init(options);
 		player->updates(
 		) | rpl::start_with_next_error_done([=](Update &&update) {
diff --git a/Telegram/SourceFiles/media/audio/media_audio.cpp b/Telegram/SourceFiles/media/audio/media_audio.cpp
index e232ee34a7..bee9fef7f8 100644
--- a/Telegram/SourceFiles/media/audio/media_audio.cpp
+++ b/Telegram/SourceFiles/media/audio/media_audio.cpp
@@ -28,13 +28,14 @@ Q_DECLARE_METATYPE(VoiceWaveform);
 
 namespace {
 
-QMutex AudioMutex;
-ALCdevice *AudioDevice = nullptr;
-ALCcontext *AudioContext = nullptr;
-
 constexpr auto kSuppressRatioAll = 0.2;
 constexpr auto kSuppressRatioSong = 0.05;
 constexpr auto kPlaybackSpeedMultiplier = 1.7;
+constexpr auto kWaveformCounterBufferSize = 256 * 1024;
+
+QMutex AudioMutex;
+ALCdevice *AudioDevice = nullptr;
+ALCcontext *AudioContext = nullptr;
 
 auto VolumeMultiplierAll = 1.;
 auto VolumeMultiplierSong = 1.;
@@ -823,6 +824,10 @@ void Mixer::feedFromVideo(const VideoSoundPart &part) {
 	_loader->feedFromVideo(part);
 }
 
+void Mixer::forceToBufferVideo(const AudioMsgId &audioId) {
+	_loader->forceToBufferVideo(audioId);
+}
+
 Mixer::TimeCorrection Mixer::getVideoTimeCorrection(
 		const AudioMsgId &audio) const {
 	Expects(audio.type() == AudioMsgId::Type::Video);
@@ -1683,7 +1688,7 @@ public:
 		}
 
 		QByteArray buffer;
-		buffer.reserve(AudioVoiceMsgBufferSize);
+		buffer.reserve(kWaveformCounterBufferSize);
 		int64 countbytes = sampleSize() * samplesCount();
 		int64 processed = 0;
 		int64 sumbytes = 0;
diff --git a/Telegram/SourceFiles/media/audio/media_audio.h b/Telegram/SourceFiles/media/audio/media_audio.h
index 8c64090a27..c3602a16ec 100644
--- a/Telegram/SourceFiles/media/audio/media_audio.h
+++ b/Telegram/SourceFiles/media/audio/media_audio.h
@@ -122,6 +122,7 @@ public:
 
 	// Video player audio stream interface.
 	void feedFromVideo(const VideoSoundPart &part);
+	void forceToBufferVideo(const AudioMsgId &audioId);
 	struct TimeCorrection {
 		crl::time audioPositionValue = kTimeUnknown;
 		crl::time audioPositionTime = kTimeUnknown;
diff --git a/Telegram/SourceFiles/media/audio/media_audio_capture.cpp b/Telegram/SourceFiles/media/audio/media_audio_capture.cpp
index 016da578d3..844f589a82 100644
--- a/Telegram/SourceFiles/media/audio/media_audio_capture.cpp
+++ b/Telegram/SourceFiles/media/audio/media_audio_capture.cpp
@@ -22,6 +22,7 @@ namespace {
 constexpr auto kCaptureFrequency = Player::kDefaultFrequency;
 constexpr auto kCaptureSkipDuration = crl::time(400);
 constexpr auto kCaptureFadeInDuration = crl::time(300);
+constexpr auto kCaptureBufferSlice = 256 * 1024;
 
 Instance *CaptureInstance = nullptr;
 
@@ -323,7 +324,7 @@ void Instance::Inner::onStart() {
 
 	_timer.start(50);
 	_captured.clear();
-	_captured.reserve(AudioVoiceMsgBufferSize);
+	_captured.reserve(kCaptureBufferSlice);
 	DEBUG_LOG(("Audio Capture: started!"));
 }
 
@@ -489,8 +490,8 @@ void Instance::Inner::onTimeout() {
 		// Get samples from OpenAL
 		auto s = _captured.size();
 		auto news = s + static_cast<int>(samples * sizeof(short));
-		if (news / AudioVoiceMsgBufferSize > s / AudioVoiceMsgBufferSize) {
-			_captured.reserve(((news / AudioVoiceMsgBufferSize) + 1) * AudioVoiceMsgBufferSize);
+		if (news / kCaptureBufferSlice > s / kCaptureBufferSlice) {
+			_captured.reserve(((news / kCaptureBufferSlice) + 1) * kCaptureBufferSlice);
 		}
 		_captured.resize(news);
 		alcCaptureSamples(d->device, (ALCvoid *)(_captured.data() + s), samples);
diff --git a/Telegram/SourceFiles/media/audio/media_audio_loader.h b/Telegram/SourceFiles/media/audio/media_audio_loader.h
index 46f05b5d41..075382ccb3 100644
--- a/Telegram/SourceFiles/media/audio/media_audio_loader.h
+++ b/Telegram/SourceFiles/media/audio/media_audio_loader.h
@@ -36,9 +36,16 @@ public:
 		EndOfFile,
 	};
 	virtual ReadResult readMore(QByteArray &samples, int64 &samplesCount) = 0;
-	virtual void enqueuePackets(QQueue<FFMpeg::AVPacketDataWrap> &packets) {
+	virtual void enqueuePackets(
+			QQueue<FFMpeg::AVPacketDataWrap> &&packets) {
 		Unexpected("enqueuePackets() call on not ChildFFMpegLoader.");
 	}
+	virtual void setForceToBuffer(bool force) {
+		Unexpected("setForceToBuffer() call on not ChildFFMpegLoader.");
+	}
+	virtual bool forceToBuffer() const {
+		return false;
+	}
 
 	void saveDecodedSamples(QByteArray *samples, int64 *samplesCount);
 	void takeSavedDecodedSamples(QByteArray *samples, int64 *samplesCount);
diff --git a/Telegram/SourceFiles/media/audio/media_audio_loaders.cpp b/Telegram/SourceFiles/media/audio/media_audio_loaders.cpp
index 922da09d54..15964a2fc3 100644
--- a/Telegram/SourceFiles/media/audio/media_audio_loaders.cpp
+++ b/Telegram/SourceFiles/media/audio/media_audio_loaders.cpp
@@ -13,8 +13,14 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 
 namespace Media {
 namespace Player {
+namespace {
 
-Loaders::Loaders(QThread *thread) : _fromVideoNotify([this] { videoSoundAdded(); }) {
+constexpr auto kPlaybackBufferSize = 256 * 1024;
+
+} // namespace
+
+Loaders::Loaders(QThread *thread)
+: _fromVideoNotify([=] { videoSoundAdded(); }) {
 	moveToThread(thread);
 	_fromVideoNotify.moveToThread(thread);
 	connect(thread, SIGNAL(started()), this, SLOT(onInit()));
@@ -25,8 +31,22 @@ void Loaders::feedFromVideo(const VideoSoundPart &part) {
 	auto invoke = false;
 	{
 		QMutexLocker lock(&_fromVideoMutex);
+		invoke = _fromVideoQueues.empty()
+			&& _fromVideoForceToBuffer.empty();
 		_fromVideoQueues[part.audio].enqueue(FFMpeg::dataWrapFromPacket(*part.packet));
-		invoke = true;
+	}
+	if (invoke) {
+		_fromVideoNotify.call();
+	}
+}
+
+void Loaders::forceToBufferVideo(const AudioMsgId &audioId) {
+	auto invoke = false;
+	{
+		QMutexLocker lock(&_fromVideoMutex);
+		invoke = _fromVideoQueues.empty()
+			&& _fromVideoForceToBuffer.empty();
+		_fromVideoForceToBuffer.emplace(audioId);
 	}
 	if (invoke) {
 		_fromVideoNotify.call();
@@ -34,36 +54,53 @@ void Loaders::feedFromVideo(const VideoSoundPart &part) {
 }
 
 void Loaders::videoSoundAdded() {
-	auto waitingAndAdded = false;
 	auto queues = decltype(_fromVideoQueues)();
+	auto forces = decltype(_fromVideoForceToBuffer)();
 	{
 		QMutexLocker lock(&_fromVideoMutex);
 		queues = base::take(_fromVideoQueues);
+		forces = base::take(_fromVideoForceToBuffer);
 	}
-	auto tryLoader = [this](auto &audio, auto &loader, auto &it) {
-		if (audio == it.key() && loader) {
-			loader->enqueuePackets(it.value());
-			if (loader->holdsSavedDecodedSamples()) {
-				onLoad(audio);
+	for (const auto &audioId : forces) {
+		const auto tryLoader = [&](const auto &id, auto &loader) {
+			if (audioId == id && loader) {
+				loader->setForceToBuffer(true);
+				if (loader->holdsSavedDecodedSamples()
+					&& !queues.contains(audioId)) {
+					loadData(audioId);
+				}
+				return true;
 			}
-			return true;
-		}
-		return false;
-	};
-	for (auto i = queues.begin(), e = queues.end(); i != e; ++i) {
-		if (!tryLoader(_audio, _audioLoader, i)
-			&& !tryLoader(_song, _songLoader, i)
-			&& !tryLoader(_video, _videoLoader, i)) {
-			for (auto &packetData : i.value()) {
+			return false;
+		};
+		tryLoader(_audio, _audioLoader)
+			|| tryLoader(_song, _songLoader)
+			|| tryLoader(_video, _videoLoader);
+	}
+	for (auto &pair : queues) {
+		const auto audioId = pair.first;
+		auto &packets = pair.second;
+		const auto tryLoader = [&](const auto &id, auto &loader) {
+			if (id == audioId && loader) {
+				loader->enqueuePackets(std::move(packets));
+				if (loader->holdsSavedDecodedSamples()) {
+					loadData(audioId);
+				}
+				return true;
+			}
+			return false;
+		};
+		const auto used = tryLoader(_audio, _audioLoader)
+			|| tryLoader(_song, _songLoader)
+			|| tryLoader(_video, _videoLoader);
+		if (!used) {
+			for (auto &packetData : packets) {
 				AVPacket packet;
 				FFMpeg::packetFromDataWrap(packet, packetData);
 				FFMpeg::freePacket(&packet);
 			}
 		}
 	}
-	if (waitingAndAdded) {
-		onLoad(_video);
-	}
 }
 
 Loaders::~Loaders() {
@@ -73,8 +110,10 @@ Loaders::~Loaders() {
 
 void Loaders::clearFromVideoQueue() {
 	auto queues = base::take(_fromVideoQueues);
-	for (auto &queue : queues) {
-		for (auto &packetData : queue) {
+	for (auto &pair : queues) {
+		const auto audioId = pair.first;
+		auto &packets = pair.second;
+		for (auto &packetData : packets) {
 			AVPacket packet;
 			FFMpeg::packetFromDataWrap(packet, packetData);
 			FFMpeg::freePacket(&packet);
@@ -120,7 +159,7 @@ void Loaders::emitError(AudioMsgId::Type type) {
 }
 
 void Loaders::onLoad(const AudioMsgId &audio) {
-	loadData(audio, crl::time(0));
+	loadData(audio);
 }
 
 void Loaders::loadData(AudioMsgId audio, crl::time positionMs) {
@@ -144,7 +183,7 @@ void Loaders::loadData(AudioMsgId audio, crl::time positionMs) {
 	if (l->holdsSavedDecodedSamples()) {
 		l->takeSavedDecodedSamples(&samples, &samplesCount);
 	}
-	while (samples.size() < AudioVoiceMsgBufferSize) {
+	while (samples.size() < kPlaybackBufferSize) {
 		auto res = l->readMore(samples, samplesCount);
 		using Result = AudioPlayerLoader::ReadResult;
 		if (res == Result::Error) {
@@ -166,7 +205,8 @@ void Loaders::loadData(AudioMsgId audio, crl::time positionMs) {
 		} else if (res == Result::Ok) {
 			errAtStart = false;
 		} else if (res == Result::Wait) {
-			waiting = (samples.size() < AudioVoiceMsgBufferSize);
+			waiting = (samples.size() < kPlaybackBufferSize)
+				&& !l->forceToBuffer();
 			if (waiting) {
 				l->saveDecodedSamples(&samples, &samplesCount);
 			}
@@ -219,8 +259,16 @@ void Loaders::loadData(AudioMsgId audio, crl::time positionMs) {
 		if (bufferIndex < 0) { // No free buffers, wait.
 			l->saveDecodedSamples(&samples, &samplesCount);
 			return;
+		} else if (l->forceToBuffer()) {
+			l->setForceToBuffer(false);
 		}
 
+		//LOG(("[%4] PUSHING %1 SAMPLES (%2 BYTES) %3ms"
+		//	).arg(samplesCount
+		//	).arg(samples.size()
+		//	).arg((samplesCount * 1000LL) / track->frequency
+		//	).arg(crl::now() % 10000, 4, 10, QChar('0')));
+
 		track->bufferSamples[bufferIndex] = samples;
 		track->samplesCount[bufferIndex] = samplesCount;
 		track->bufferedLength += samplesCount;
diff --git a/Telegram/SourceFiles/media/audio/media_audio_loaders.h b/Telegram/SourceFiles/media/audio/media_audio_loaders.h
index e4aeff7f72..0fe96429e2 100644
--- a/Telegram/SourceFiles/media/audio/media_audio_loaders.h
+++ b/Telegram/SourceFiles/media/audio/media_audio_loaders.h
@@ -22,6 +22,7 @@ class Loaders : public QObject {
 public:
 	Loaders(QThread *thread);
 	void feedFromVideo(const VideoSoundPart &part);
+	void forceToBufferVideo(const AudioMsgId &audioId);
 	~Loaders();
 
 signals:
@@ -45,7 +46,8 @@ private:
 	std::unique_ptr<AudioPlayerLoader> _videoLoader;
 
 	QMutex _fromVideoMutex;
-	QMap<AudioMsgId, QQueue<FFMpeg::AVPacketDataWrap>> _fromVideoQueues;
+	base::flat_map<AudioMsgId, QQueue<FFMpeg::AVPacketDataWrap>> _fromVideoQueues;
+	base::flat_set<AudioMsgId> _fromVideoForceToBuffer;
 	SingleQueuedInvokation _fromVideoNotify;
 
 	void emitError(AudioMsgId::Type type);
@@ -58,7 +60,7 @@ private:
 		SetupErrorLoadedFull = 2,
 		SetupNoErrorStarted = 3,
 	};
-	void loadData(AudioMsgId audio, crl::time positionMs);
+	void loadData(AudioMsgId audio, crl::time positionMs = 0);
 	AudioPlayerLoader *setupLoader(
 		const AudioMsgId &audio,
 		SetupError &err,
diff --git a/Telegram/SourceFiles/media/audio/media_child_ffmpeg_loader.cpp b/Telegram/SourceFiles/media/audio/media_child_ffmpeg_loader.cpp
index 0284fd7118..282085e642 100644
--- a/Telegram/SourceFiles/media/audio/media_child_ffmpeg_loader.cpp
+++ b/Telegram/SourceFiles/media/audio/media_child_ffmpeg_loader.cpp
@@ -111,11 +111,24 @@ AudioPlayerLoader::ReadResult ChildFFMpegLoader::readMore(
 	return ReadResult::Ok;
 }
 
-void ChildFFMpegLoader::enqueuePackets(QQueue<FFMpeg::AVPacketDataWrap> &packets) {
-	_queue += std::move(packets);
+void ChildFFMpegLoader::enqueuePackets(
+		QQueue<FFMpeg::AVPacketDataWrap> &&packets) {
+	if (_queue.empty()) {
+		_queue = std::move(packets);
+	} else {
+		_queue += std::move(packets);
+	}
 	packets.clear();
 }
 
+void ChildFFMpegLoader::setForceToBuffer(bool force) {
+	_forceToBuffer = force;
+}
+
+bool ChildFFMpegLoader::forceToBuffer() const {
+	return _forceToBuffer;
+}
+
 ChildFFMpegLoader::~ChildFFMpegLoader() {
 	for (auto &packetData : base::take(_queue)) {
 		AVPacket packet;
diff --git a/Telegram/SourceFiles/media/audio/media_child_ffmpeg_loader.h b/Telegram/SourceFiles/media/audio/media_child_ffmpeg_loader.h
index c3003ca7d0..16a9965dd0 100644
--- a/Telegram/SourceFiles/media/audio/media_child_ffmpeg_loader.h
+++ b/Telegram/SourceFiles/media/audio/media_child_ffmpeg_loader.h
@@ -70,7 +70,10 @@ public:
 	}
 
 	ReadResult readMore(QByteArray &result, int64 &samplesAdded) override;
-	void enqueuePackets(QQueue<FFMpeg::AVPacketDataWrap> &packets) override;
+	void enqueuePackets(
+		QQueue<FFMpeg::AVPacketDataWrap> &&packets) override;
+	void setForceToBuffer(bool force) override;
+	bool forceToBuffer() const override;
 
 	bool eofReached() const {
 		return _eofReached;
@@ -88,6 +91,7 @@ private:
 
 	std::unique_ptr<VideoSoundData> _parentData;
 	QQueue<FFMpeg::AVPacketDataWrap> _queue;
+	bool _forceToBuffer = false;
 	bool _eofReached = false;
 
 };
diff --git a/Telegram/SourceFiles/media/streaming/media_streaming_audio_track.cpp b/Telegram/SourceFiles/media/streaming/media_streaming_audio_track.cpp
index 6d2d9cc129..95981ba88f 100644
--- a/Telegram/SourceFiles/media/streaming/media_streaming_audio_track.cpp
+++ b/Telegram/SourceFiles/media/streaming/media_streaming_audio_track.cpp
@@ -50,6 +50,12 @@ void AudioTrack::process(Packet &&packet) {
 	}
 }
 
+void AudioTrack::waitForData() {
+	if (initialized()) {
+		mixerForceToBuffer();
+	}
+}
+
 bool AudioTrack::initialized() const {
 	return !_ready;
 }
@@ -115,6 +121,10 @@ void AudioTrack::mixerEnqueue(Packet &&packet) {
 	packet.release();
 }
 
+void AudioTrack::mixerForceToBuffer() {
+	Media::Player::mixer()->forceToBufferVideo(_audioId);
+}
+
 void AudioTrack::start(crl::time startTime) {
 	Expects(initialized());
 
diff --git a/Telegram/SourceFiles/media/streaming/media_streaming_audio_track.h b/Telegram/SourceFiles/media/streaming/media_streaming_audio_track.h
index 8bcbb0eee4..784a2f8a58 100644
--- a/Telegram/SourceFiles/media/streaming/media_streaming_audio_track.h
+++ b/Telegram/SourceFiles/media/streaming/media_streaming_audio_track.h
@@ -39,6 +39,7 @@ public:
 
 	// Called from the same unspecified thread.
 	void process(Packet &&packet);
+	void waitForData();
 
 	// Called from the main thread.
 	~AudioTrack();
@@ -50,6 +51,7 @@ private:
 	[[nodiscard]] bool fillStateFromFrame();
 	void mixerInit();
 	void mixerEnqueue(Packet &&packet);
+	void mixerForceToBuffer();
 	void callReady();
 
 	const PlaybackOptions _options;
diff --git a/Telegram/SourceFiles/media/streaming/media_streaming_common.h b/Telegram/SourceFiles/media/streaming/media_streaming_common.h
index e04ff61d5a..7890805692 100644
--- a/Telegram/SourceFiles/media/streaming/media_streaming_common.h
+++ b/Telegram/SourceFiles/media/streaming/media_streaming_common.h
@@ -27,6 +27,7 @@ struct PlaybackOptions {
 	Mode mode = Mode::Both;
 	crl::time position = 0;
 	float64 speed = 1.; // Valid values between 0.5 and 2.
+	bool syncVideoByAudio = true;
 };
 
 struct TrackState {
diff --git a/Telegram/SourceFiles/media/streaming/media_streaming_file.cpp b/Telegram/SourceFiles/media/streaming/media_streaming_file.cpp
index 94ddcfd94e..bc71b873a9 100644
--- a/Telegram/SourceFiles/media/streaming/media_streaming_file.cpp
+++ b/Telegram/SourceFiles/media/streaming/media_streaming_file.cpp
@@ -41,6 +41,7 @@ int File::Context::read(bytes::span buffer) {
 	}
 	buffer = buffer.subspan(0, amount);
 	while (!_reader->fill(buffer, _offset, &_semaphore)) {
+		_delegate->fileWaitingForData();
 		_semaphore.acquire();
 		if (_interrupted) {
 			return -1;
diff --git a/Telegram/SourceFiles/media/streaming/media_streaming_file_delegate.h b/Telegram/SourceFiles/media/streaming/media_streaming_file_delegate.h
index a3072a5762..8cab745682 100644
--- a/Telegram/SourceFiles/media/streaming/media_streaming_file_delegate.h
+++ b/Telegram/SourceFiles/media/streaming/media_streaming_file_delegate.h
@@ -17,6 +17,7 @@ class FileDelegate {
 public:
 	virtual void fileReady(Stream &&video, Stream &&audio) = 0;
 	virtual void fileError() = 0;
+	virtual void fileWaitingForData() = 0;
 
 	// Return true if reading and processing more packets is desired.
 	// Return false if sleeping until 'wake()' is called is desired.
diff --git a/Telegram/SourceFiles/media/streaming/media_streaming_loader_mtproto.cpp b/Telegram/SourceFiles/media/streaming/media_streaming_loader_mtproto.cpp
index cb941510a0..8e3445b064 100644
--- a/Telegram/SourceFiles/media/streaming/media_streaming_loader_mtproto.cpp
+++ b/Telegram/SourceFiles/media/streaming/media_streaming_loader_mtproto.cpp
@@ -13,7 +13,7 @@ namespace Media {
 namespace Streaming {
 namespace {
 
-constexpr auto kMaxConcurrentRequests = 1; // #TODO streaming
+constexpr auto kMaxConcurrentRequests = 2; // #TODO streaming
 
 } // namespace
 
diff --git a/Telegram/SourceFiles/media/streaming/media_streaming_player.cpp b/Telegram/SourceFiles/media/streaming/media_streaming_player.cpp
index d8607e88d1..6365f3b961 100644
--- a/Telegram/SourceFiles/media/streaming/media_streaming_player.cpp
+++ b/Telegram/SourceFiles/media/streaming/media_streaming_player.cpp
@@ -158,7 +158,6 @@ void Player::trackPlayedTill(
 void Player::audioReceivedTill(crl::time position) {
 	Expects(_audio != nullptr);
 
-	//LOG(("AUDIO TILL: %1").arg(position));
 	trackReceivedTill(*_audio, _information.audio.state, position);
 }
 
@@ -171,7 +170,6 @@ void Player::audioPlayedTill(crl::time position) {
 void Player::videoReceivedTill(crl::time position) {
 	Expects(_video != nullptr);
 
-	//LOG(("VIDEO TILL: %1").arg(position));
 	trackReceivedTill(*_video, _information.video.state, position);
 }
 
@@ -182,6 +180,8 @@ void Player::videoPlayedTill(crl::time position) {
 }
 
 void Player::fileReady(Stream &&video, Stream &&audio) {
+	_waitingForData = false;
+
 	const auto weak = base::make_weak(&_sessionGuard);
 	const auto ready = [=](const Information & data) {
 		crl::on_main(weak, [=, data = data]() mutable {
@@ -226,12 +226,32 @@ void Player::fileReady(Stream &&video, Stream &&audio) {
 }
 
 void Player::fileError() {
+	_waitingForData = false;
+
 	crl::on_main(&_sessionGuard, [=] {
 		fail();
 	});
 }
 
+void Player::fileWaitingForData() {
+	if (_waitingForData) {
+		return;
+	}
+	_waitingForData = true;
+	crl::on_main(&_sessionGuard, [=] {
+		_updates.fire({ WaitingForData() });
+	});
+	if (_audio) {
+		_audio->waitForData();
+	}
+	if (_video) {
+		_video->waitForData();
+	}
+}
+
 bool Player::fileProcessPacket(Packet &&packet) {
+	_waitingForData = false;
+
 	const auto &native = packet.fields();
 	const auto index = native.stream_index;
 	if (packet.empty()) {
@@ -250,12 +270,20 @@ bool Player::fileProcessPacket(Packet &&packet) {
 		}
 	} else if (_audio && _audio->streamIndex() == native.stream_index) {
 		const auto time = PacketPosition(packet, _audio->streamTimeBase());
+		//LOG(("[%2] AUDIO PACKET FOR %1ms"
+		//	).arg(time
+		//	).arg(crl::now() % 10000, 4, 10, QChar('0')));
+
 		crl::on_main(&_sessionGuard, [=] {
 			audioReceivedTill(time);
 		});
 		_audio->process(std::move(packet));
 	} else if (_video && _video->streamIndex() == native.stream_index) {
 		const auto time = PacketPosition(packet, _video->streamTimeBase());
+		//LOG(("[%2] VIDEO PACKET FOR %1ms"
+		//	).arg(time
+		//	).arg(crl::now() % 10000, 4, 10, QChar('0')));
+
 		crl::on_main(&_sessionGuard, [=] {
 			videoReceivedTill(time);
 		});
@@ -368,7 +396,16 @@ rpl::lifetime &Player::lifetime() {
 	return _lifetime;
 }
 
-Player::~Player() = default;
+Player::~Player() {
+	// The order of field destruction is important.
+	//
+	// We are forced to maintain the correct order in the stop() method,
+	// because it can be called even before the player destruction.
+	//
+	// So instead of maintaining it in the class definition as well we
+	// simply call stop() here, after that the destruction is trivial.
+	stop();
+}
 
 } // namespace Streaming
 } // namespace Media
diff --git a/Telegram/SourceFiles/media/streaming/media_streaming_player.h b/Telegram/SourceFiles/media/streaming/media_streaming_player.h
index a3ab28b722..e9b7489391 100644
--- a/Telegram/SourceFiles/media/streaming/media_streaming_player.h
+++ b/Telegram/SourceFiles/media/streaming/media_streaming_player.h
@@ -52,6 +52,9 @@ public:
 	~Player();
 
 private:
+	static constexpr auto kReceivedTillEnd
+		= std::numeric_limits<crl::time>::max();
+
 	enum class Stage {
 		Uninitialized,
 		Initializing,
@@ -66,6 +69,7 @@ private:
 	// FileDelegate methods are called only from the File thread.
 	void fileReady(Stream &&video, Stream &&audio) override;
 	void fileError() override;
+	void fileWaitingForData() override;
 	bool fileProcessPacket(Packet &&packet) override;
 	bool fileReadMore() override;
 
@@ -95,9 +99,6 @@ private:
 
 	const std::unique_ptr<File> _file;
 
-	static constexpr auto kReceivedTillEnd
-		= std::numeric_limits<crl::time>::max();
-
 	// Immutable while File is active after it is ready.
 	AudioMsgId _audioId;
 	std::unique_ptr<AudioTrack> _audio;
@@ -109,6 +110,7 @@ private:
 
 	// Belongs to the File thread while File is active.
 	bool _readTillEnd = false;
+	bool _waitingForData = false;
 
 	// Belongs to the main thread.
 	Information _information;
diff --git a/Telegram/SourceFiles/media/streaming/media_streaming_video_track.cpp b/Telegram/SourceFiles/media/streaming/media_streaming_video_track.cpp
index 7736edd5a6..85baf550bb 100644
--- a/Telegram/SourceFiles/media/streaming/media_streaming_video_track.cpp
+++ b/Telegram/SourceFiles/media/streaming/media_streaming_video_track.cpp
@@ -277,7 +277,7 @@ VideoTrackObject::TrackTime VideoTrackObject::trackTime() const {
 		return result;
 	}
 
-	const auto correction = _audioId.playId()
+	const auto correction = (_options.syncVideoByAudio && _audioId.playId())
 		? Media::Player::mixer()->getVideoTimeCorrection(_audioId)
 		: Media::Player::Mixer::TimeCorrection();
 	const auto knownValue = correction
@@ -478,6 +478,9 @@ void VideoTrack::process(Packet &&packet) {
 	});
 }
 
+void VideoTrack::waitForData() {
+}
+
 void VideoTrack::start(crl::time startTime) {
 	_wrapped.with([=](Implementation &unwrapped) {
 		unwrapped.start(startTime);
diff --git a/Telegram/SourceFiles/media/streaming/media_streaming_video_track.h b/Telegram/SourceFiles/media/streaming/media_streaming_video_track.h
index 01555de73b..1beba8b18c 100644
--- a/Telegram/SourceFiles/media/streaming/media_streaming_video_track.h
+++ b/Telegram/SourceFiles/media/streaming/media_streaming_video_track.h
@@ -33,6 +33,7 @@ public:
 
 	// Called from the same unspecified thread.
 	void process(Packet &&packet);
+	void waitForData();
 
 	// Called from the main thread.
 	void start(crl::time startTime);