Support streaming speed changing.

Telegram/SourceFiles/data/data_document.cpp

@@ -295,6 +295,12 @@ void StartStreaming(
 	using namespace Media::Streaming;
 	if (auto loader = document->createStreamingLoader(origin)) {
 		static auto player = std::unique_ptr<Player>();
+		static auto pauseOnSeek = false;
+		static auto duration = crl::time(0);
+		static auto options = Media::Streaming::PlaybackOptions();
+		static auto subscribe = Fn<void()>();
+		static auto speed = 1.;
+		static auto step = pow(2., 1. / 12);
 
 		class Panel
 #if defined Q_OS_MAC && !defined OS_MAC_OLD
@@ -319,68 +325,97 @@ void StartStreaming(
 					} else {
 						player->pause();
 					}
+				} else if (e->key() == Qt::Key_Plus) {
+					speed = std::min(speed * step, 2.);
+					player->setSpeed(speed);
+				} else if (e->key() == Qt::Key_Minus) {
+					speed = std::max(speed / step, 0.5);
+					player->setSpeed(speed);
 				}
 			}
+			void mousePressEvent(QMouseEvent *e) override {
+				pauseOnSeek = player->paused();
+				player->pause();
+			}
+			void mouseReleaseEvent(QMouseEvent *e) override {
+				options.position = std::clamp(
+					(duration * e->pos().x()) / width(),
+					crl::time(0),
+					crl::time(duration));
+				player->play(options);
+				subscribe();
+			}
 
 		};
 
 		static auto video = base::unique_qptr<Panel>();
+		subscribe = [] {
+			player->updates(
+			) | rpl::start_with_next_error_done([=](Update &&update) {
+				update.data.match([&](Information &update) {
+					duration = update.video.state.duration;
+					if (!video && !update.video.cover.isNull()) {
+						video = base::make_unique_q<Panel>();
+						video->setAttribute(Qt::WA_OpaquePaintEvent);
+						video->paintRequest(
+						) | rpl::start_with_next([=](QRect rect) {
+							if (player->ready()) {
+								Painter(video.get()).drawImage(
+									video->rect(),
+									player->frame(FrameRequest()));
+							} else {
+								Painter(video.get()).fillRect(
+									rect,
+									Qt::black);
+							}
+						}, video->lifetime());
+						const auto size = QSize(
+							ConvertScale(update.video.size.width()),
+							ConvertScale(update.video.size.height()));
+						const auto center = App::wnd()->geometry().center();
+						video->setGeometry(QRect(
+							center - QPoint(size.width(), size.height()) / 2,
+							size));
+						video->show();
+						video->shownValue(
+						) | rpl::start_with_next([=](bool shown) {
+							if (!shown) {
+								base::take(player) = nullptr;
+							}
+						}, video->lifetime());
+					}
+				}, [&](PreloadedVideo &update) {
+				}, [&](UpdateVideo &update) {
+					Expects(video != nullptr);
+
+					video->update();
+				}, [&](PreloadedAudio &update) {
+				}, [&](UpdateAudio &update) {
+				}, [&](WaitingForData &update) {
+				}, [&](MutedByOther &update) {
+				});
+			}, [=](const Error &error) {
+				base::take(video) = nullptr;
+			}, [=] {
+			}, player->lifetime());
+		};
+
 		player = std::make_unique<Player>(
 			&document->owner(),
 			std::move(loader));
-		video = nullptr;
-		document->session().lifetime().add([] {
-			base::take(player) = nullptr;
+		base::take(video) = nullptr;
+		player->lifetime().add([] {
 			base::take(video) = nullptr;
 		});
+		document->session().lifetime().add([] {
+			base::take(player) = nullptr;
+		});
 
-		auto options = Media::Streaming::PlaybackOptions();
-		options.speed = 1.7;
+		options.speed = speed;
 		//options.syncVideoByAudio = false;
-		options.position = (document->duration() / 2) * crl::time(1000);
+		options.position = 0;
 		player->play(options);
-		player->updates(
-		) | rpl::start_with_next_error_done([=](Update &&update) {
-			update.data.match([&](Information &update) {
-				if (!update.video.cover.isNull()) {
-					video = base::make_unique_q<Panel>();
-					video->setAttribute(Qt::WA_OpaquePaintEvent);
-					video->paintRequest(
-					) | rpl::start_with_next([=](QRect rect) {
-						Painter(video.get()).drawImage(
-							video->rect(),
-							player->frame(FrameRequest()));
-					}, video->lifetime());
-					const auto size = QSize(
-						ConvertScale(update.video.size.width()),
-						ConvertScale(update.video.size.height()));
-					const auto center = App::wnd()->geometry().center();
-					video->setGeometry(QRect(
-						center - QPoint(size.width(), size.height()) / 2,
-						size));
-					video->show();
-					video->shownValue(
-					) | rpl::start_with_next([=](bool shown) {
-						if (!shown) {
-							base::take(player) = nullptr;
-						}
-					}, video->lifetime());
-				}
-			}, [&](PreloadedVideo &update) {
-			}, [&](UpdateVideo &update) {
-				Expects(video != nullptr);
-
-				video->update();
-			}, [&](PreloadedAudio &update) {
-			}, [&](UpdateAudio &update) {
-			}, [&](WaitingForData &update) {
-			}, [&](MutedByOther &update) {
-			});
-		}, [=](const Error &error) {
-			base::take(video) = nullptr;
-		}, [=] {
-			base::take(video) = nullptr;
-		}, player->lifetime());
+		subscribe();
 	}
 }
 

Telegram/SourceFiles/media/audio/media_audio.cpp

@@ -303,6 +303,14 @@ void StopDetachIfNotUsedSafe() {
 	});
 }
 
+bool SupportsSpeedControl() {
+#ifndef TDESKTOP_DISABLE_OPENAL_EFFECTS
+	return true;
+#else // TDESKTOP_DISABLE_OPENAL_EFFECTS
+	return false;
+#endif // TDESKTOP_DISABLE_OPENAL_EFFECTS
+}
+
 } // namespace Audio
 
 namespace Player {
@@ -347,24 +355,39 @@ void Mixer::Track::createStream(AudioMsgId::Type type) {
 	alGenBuffers(3, stream.buffers);
 	if (type == AudioMsgId::Type::Voice) {
 		mixer()->updatePlaybackSpeed(this);
+#ifndef TDESKTOP_DISABLE_OPENAL_EFFECTS
 	} else if (speedEffect) {
+		applySourceSpeedEffect();
+	} else {
+		removeSourceSpeedEffect();
+#endif // TDESKTOP_DISABLE_OPENAL_EFFECTS
+	}
+}
+
+#ifndef TDESKTOP_DISABLE_OPENAL_EFFECTS
+void Mixer::Track::removeSourceSpeedEffect() {
+	alSource3i(stream.source, AL_AUXILIARY_SEND_FILTER, AL_EFFECTSLOT_NULL, 0, 0);
+	alSourcei(stream.source, AL_DIRECT_FILTER, AL_FILTER_NULL);
+}
+
+void Mixer::Track::applySourceSpeedEffect() {
+	Expects(speedEffect != nullptr);
+
+	if (!speedEffect->effect || !alIsEffect(speedEffect->effect)) {
 		alGenAuxiliaryEffectSlots(1, &speedEffect->effectSlot);
 		alGenEffects(1, &speedEffect->effect);
 		alGenFilters(1, &speedEffect->filter);
 		alEffecti(speedEffect->effect, AL_EFFECT_TYPE, AL_EFFECT_PITCH_SHIFTER);
-		alEffecti(speedEffect->effect, AL_PITCH_SHIFTER_COARSE_TUNE, speedEffect->coarseTune);
-		alAuxiliaryEffectSloti(speedEffect->effectSlot, AL_EFFECTSLOT_EFFECT, speedEffect->effect);
 		alFilteri(speedEffect->filter, AL_FILTER_TYPE, AL_FILTER_LOWPASS);
 		alFilterf(speedEffect->filter, AL_LOWPASS_GAIN, 0.f);
-
-		alSourcef(stream.source, AL_PITCH, speedEffect->speed);
-		alSource3i(stream.source, AL_AUXILIARY_SEND_FILTER, speedEffect->effectSlot, 0, 0);
-		alSourcei(stream.source, AL_DIRECT_FILTER, speedEffect->filter);
-	} else {
-		alSource3i(stream.source, AL_AUXILIARY_SEND_FILTER, AL_EFFECTSLOT_NULL, 0, 0);
-		alSourcei(stream.source, AL_DIRECT_FILTER, AL_FILTER_NULL);
 	}
+	alEffecti(speedEffect->effect, AL_PITCH_SHIFTER_COARSE_TUNE, speedEffect->coarseTune);
+	alAuxiliaryEffectSloti(speedEffect->effectSlot, AL_EFFECTSLOT_EFFECT, speedEffect->effect);
+	alSourcef(stream.source, AL_PITCH, speedEffect->speed);
+	alSource3i(stream.source, AL_AUXILIARY_SEND_FILTER, speedEffect->effectSlot, 0, 0);
+	alSourcei(stream.source, AL_DIRECT_FILTER, speedEffect->filter);
 }
+#endif // TDESKTOP_DISABLE_OPENAL_EFFECTS
 
 void Mixer::Track::destroyStream() {
 	if (isStreamCreated()) {
@@ -375,19 +398,28 @@ void Mixer::Track::destroyStream() {
 	for (auto i = 0; i != 3; ++i) {
 		stream.buffers[i] = 0;
 	}
+#ifndef TDESKTOP_DISABLE_OPENAL_EFFECTS
 	resetSpeedEffect();
+#endif // TDESKTOP_DISABLE_OPENAL_EFFECTS
 }
 
+#ifndef TDESKTOP_DISABLE_OPENAL_EFFECTS
 void Mixer::Track::resetSpeedEffect() {
 	if (!speedEffect) {
 		return;
-	} else if (alIsEffect(speedEffect->effect)) {
+	} else if (speedEffect->effect && alIsEffect(speedEffect->effect)) {
+		if (isStreamCreated()) {
+			removeSourceSpeedEffect();
+		}
+#ifndef TDESKTOP_DISABLE_OPENAL_EFFECTS
 		alDeleteEffects(1, &speedEffect->effect);
 		alDeleteAuxiliaryEffectSlots(1, &speedEffect->effectSlot);
 		alDeleteFilters(1, &speedEffect->filter);
+#endif // TDESKTOP_DISABLE_OPENAL_EFFECTS
 	}
 	speedEffect->effect = speedEffect->effectSlot = speedEffect->filter = 0;
 }
+#endif // TDESKTOP_DISABLE_OPENAL_EFFECTS
 
 void Mixer::Track::reattach(AudioMsgId::Type type) {
 	if (isStreamCreated() || !samplesCount[0]) {
@@ -519,17 +551,30 @@ int Mixer::Track::getNotQueuedBufferIndex() {
 }
 
 void Mixer::Track::setVideoData(std::unique_ptr<VideoSoundData> data) {
-	resetSpeedEffect();
-	if (data && data->speed != 1.) {
-		speedEffect = std::make_unique<SpeedEffect>();
-		speedEffect->speed = data->speed;
-		speedEffect->coarseTune = CoarseTuneForSpeed(data->speed);
-	} else {
-		speedEffect = nullptr;
-	}
+#ifndef TDESKTOP_DISABLE_OPENAL_EFFECTS
+	changeSpeedEffect(data ? data->speed : 1.);
+#endif // TDESKTOP_DISABLE_OPENAL_EFFECTS
 	videoData = std::move(data);
 }
 
+#ifndef TDESKTOP_DISABLE_OPENAL_EFFECTS
+void Mixer::Track::changeSpeedEffect(float64 speed) {
+	if (speed != 1.) {
+		if (!speedEffect) {
+			speedEffect = std::make_unique<SpeedEffect>();
+		}
+		speedEffect->speed = speed;
+		speedEffect->coarseTune = CoarseTuneForSpeed(speed);
+		if (isStreamCreated()) {
+			applySourceSpeedEffect();
+		}
+	} else if (speedEffect) {
+		resetSpeedEffect();
+		speedEffect = nullptr;
+	}
+}
+#endif // TDESKTOP_DISABLE_OPENAL_EFFECTS
+
 void Mixer::Track::resetStream() {
 	if (isStreamCreated()) {
 		alSourceStop(stream.source);
@@ -831,12 +876,22 @@ void Mixer::forceToBufferVideo(const AudioMsgId &audioId) {
 	_loader->forceToBufferVideo(audioId);
 }
 
-Streaming::TimeCorrection Mixer::getVideoTimeCorrection(
+void Mixer::setSpeedFromVideo(const AudioMsgId &audioId, float64 speed) {
+#ifndef TDESKTOP_DISABLE_OPENAL_EFFECTS
+	QMutexLocker lock(&AudioMutex);
+	const auto track = trackForType(AudioMsgId::Type::Video);
+	if (track->state.id == audioId) {
+		track->changeSpeedEffect(speed);
+	}
+#endif // TDESKTOP_DISABLE_OPENAL_EFFECTS
+}
+
+Streaming::TimePoint Mixer::getVideoSyncTimePoint(
 		const AudioMsgId &audio) const {
 	Expects(audio.type() == AudioMsgId::Type::Video);
 	Expects(audio.playId() != 0);
 
-	auto result = Streaming::TimeCorrection();
+	auto result = Streaming::TimePoint();
 	const auto playId = audio.playId();
 
 	QMutexLocker lock(&AudioMutex);

Telegram/SourceFiles/media/audio/media_audio.h

@@ -15,7 +15,7 @@ struct VideoSoundPart;
 
 namespace Media {
 namespace Streaming {
-struct TimeCorrection;
+struct TimePoint;
 } // namespace Streaming
 
 namespace Audio {
@@ -36,6 +36,7 @@ bool AttachToDevice();
 void ScheduleDetachFromDeviceSafe();
 void ScheduleDetachIfNotUsedSafe();
 void StopDetachIfNotUsedSafe();
+bool SupportsSpeedControl();
 
 } // namespace Audio
 
@@ -126,7 +127,8 @@ public:
 	// Video player audio stream interface.
 	void feedFromVideo(const VideoSoundPart &part);
 	void forceToBufferVideo(const AudioMsgId &audioId);
-	Streaming::TimeCorrection getVideoTimeCorrection(
+	void setSpeedFromVideo(const AudioMsgId &audioId, float64 speed);
+	Streaming::TimePoint getVideoSyncTimePoint(
 		const AudioMsgId &audio) const;
 	crl::time getVideoCorrectedTime(
 		const AudioMsgId &id,
@@ -201,6 +203,9 @@ private:
 		int getNotQueuedBufferIndex();
 
 		void setVideoData(std::unique_ptr<VideoSoundData> data);
+#ifndef TDESKTOP_DISABLE_OPENAL_EFFECTS
+		void changeSpeedEffect(float64 speed);
+#endif // TDESKTOP_DISABLE_OPENAL_EFFECTS
 
 		~Track();
 
@@ -226,6 +231,7 @@ private:
 		Stream stream;
 		std::unique_ptr<VideoSoundData> videoData;
 
+#ifndef TDESKTOP_DISABLE_OPENAL_EFFECTS
 		struct SpeedEffect {
 			uint32 effect = 0;
 			uint32 effectSlot = 0;
@@ -234,14 +240,19 @@ private:
 			float64 speed = 1.;
 		};
 		std::unique_ptr<SpeedEffect> speedEffect;
+#endif // TDESKTOP_DISABLE_OPENAL_EFFECTS
 		crl::time lastUpdateWhen = 0;
 		crl::time lastUpdatePosition = 0;
 
 	private:
 		void createStream(AudioMsgId::Type type);
 		void destroyStream();
-		void resetSpeedEffect();
 		void resetStream();
+#ifndef TDESKTOP_DISABLE_OPENAL_EFFECTS
+		void resetSpeedEffect();
+		void applySourceSpeedEffect();
+		void removeSourceSpeedEffect();
+#endif // TDESKTOP_DISABLE_OPENAL_EFFECTS
 
 	};
 

Telegram/SourceFiles/media/player/media_player_widget.cpp

@@ -395,11 +395,8 @@ void Widget::checkForTypeChange() {
 }
 
 bool Widget::hasPlaybackSpeedControl() const {
-#ifndef TDESKTOP_DISABLE_OPENAL_EFFECTS
-	return (_type == AudioMsgId::Type::Voice);
-#else // TDESKTOP_DISABLE_OPENAL_EFFECTS
-	return false;
-#endif // TDESKTOP_DISABLE_OPENAL_EFFECTS
+	return (_type == AudioMsgId::Type::Voice)
+		&& Media::Audio::SupportsSpeedControl();
 }
 
 void Widget::setType(AudioMsgId::Type type) {

Telegram/SourceFiles/media/streaming/media_streaming_audio_track.cpp

@@ -137,6 +137,11 @@ void AudioTrack::resume(crl::time time) {
 	Media::Player::mixer()->resume(_audioId, true);
 }
 
+void AudioTrack::setSpeed(float64 speed) {
+	_options.speed = speed;
+	Media::Player::mixer()->setSpeedFromVideo(_audioId, speed);
+}
+
 rpl::producer<crl::time> AudioTrack::playPosition() {
 	Expects(_ready == nullptr);
 

Telegram/SourceFiles/media/streaming/media_streaming_audio_track.h

@@ -10,7 +10,6 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "media/streaming/media_streaming_utility.h"
 
 namespace Media {
-
 namespace Streaming {
 
 class AudioTrack final {
@@ -29,6 +28,9 @@ public:
 	void pause(crl::time time);
 	void resume(crl::time time);
 
+	// Called from the main thread.
+	void setSpeed(float64 speed);
+
 	// Called from the main thread.
 	// Non-const, because we subscribe to changes on the first call.
 	// Must be called after 'ready' was invoked.
@@ -55,7 +57,7 @@ private:
 	void mixerForceToBuffer();
 	void callReady();
 
-	const PlaybackOptions _options;
+	PlaybackOptions _options;
 
 	// Accessed from the same unspecified thread.
 	Stream _stream;

Telegram/SourceFiles/media/streaming/media_streaming_common.h

@@ -11,8 +11,16 @@ namespace Media {
 
 constexpr auto kTimeUnknown = std::numeric_limits<crl::time>::min();
 
+namespace Audio {
+bool SupportsSpeedControl();
+} // namespace Audio
+
 namespace Streaming {
 
+inline bool SupportsSpeedControl() {
+	return Media::Audio::SupportsSpeedControl();
+}
+
 class VideoTrack;
 class AudioTrack;
 

Telegram/SourceFiles/media/streaming/media_streaming_player.cpp

@@ -11,6 +11,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "media/streaming/media_streaming_loader.h"
 #include "media/streaming/media_streaming_audio_track.h"
 #include "media/streaming/media_streaming_video_track.h"
+#include "media/audio/media_audio.h" // for SupportsSpeedControl()
 
 namespace Media {
 namespace Streaming {
@@ -315,12 +316,15 @@ void Player::play(const PlaybackOptions &options) {
 	stop();
 
 	_options = options;
+	if (!Media::Audio::SupportsSpeedControl()) {
+		_options.speed = 1.;
+	}
 	_stage = Stage::Initializing;
 	_file->start(delegate(), _options.position);
 }
 
 void Player::pause() {
-	Expects(_stage != Stage::Uninitialized && _stage != Stage::Failed);
+	Expects(valid());
 
 	if (_paused) {
 		return;
@@ -338,7 +342,7 @@ void Player::pause() {
 }
 
 void Player::resume() {
-	Expects(_stage != Stage::Uninitialized && _stage != Stage::Failed);
+	Expects(valid());
 
 	if (!_paused) {
 		return;
@@ -386,6 +390,7 @@ void Player::stop() {
 	_audio = nullptr;
 	_video = nullptr;
 	_paused = false;
+	_information = Information();
 	invalidate_weak_ptrs(&_sessionGuard);
 	if (_stage != Stage::Failed) {
 		_stage = Stage::Uninitialized;
@@ -405,6 +410,32 @@ bool Player::paused() const {
 	return _paused;
 }
 
+void Player::setSpeed(float64 speed) {
+	Expects(valid());
+	Expects(speed >= 0.5 && speed <= 2.);
+
+	if (!Media::Audio::SupportsSpeedControl()) {
+		speed = 1.;
+	}
+	if (_options.speed != speed) {
+		_options.speed = speed;
+		if (_audio) {
+			_audio->setSpeed(speed);
+		}
+		if (_video) {
+			_video->setSpeed(speed);
+		}
+	}
+}
+
+bool Player::valid() const {
+	return (_stage != Stage::Uninitialized) && (_stage != Stage::Failed);
+}
+
+bool Player::ready() const {
+	return valid() && (_stage != Stage::Initializing);
+}
+
 rpl::producer<Update, Error> Player::updates() const {
 	return _updates.events();
 }

Telegram/SourceFiles/media/streaming/media_streaming_player.h

@@ -38,6 +38,12 @@ public:
 	void resume();
 	void stop();
 
+	bool valid() const;
+	bool ready() const;
+
+	float64 speed() const;
+	void setSpeed(float64 speed); // 0.5 <= speed <= 2.
+
 	[[nodiscard]] bool failed() const;
 	[[nodiscard]] bool playing() const;
 	[[nodiscard]] bool paused() const;

Telegram/SourceFiles/media/streaming/media_streaming_utility.h

@@ -20,7 +20,7 @@ namespace Streaming {
 
 constexpr auto kUniversalTimeBase = AVRational{ 1, AV_TIME_BASE };
 
-struct TimeCorrection {
+struct TimePoint {
 	crl::time trackTime = kTimeUnknown;
 	crl::time worldTime = kTimeUnknown;
 

Telegram/SourceFiles/media/streaming/media_streaming_video_track.cpp

@@ -39,6 +39,7 @@ public:
 
 	void pause(crl::time time);
 	void resume(crl::time time);
+	void setSpeed(float64 speed);
 	void interrupt();
 	void frameDisplayed();
 
@@ -55,14 +56,10 @@ private:
 	// Force frame position to be clamped to [0, duration] and monotonic.
 	[[nodiscard]] crl::time currentFramePosition() const;
 
-	struct TrackTime {
-		crl::time worldNow = kTimeUnknown;
-		crl::time trackNow = kTimeUnknown;
-	};
-	[[nodiscard]] TrackTime trackTime() const;
+	[[nodiscard]] TimePoint trackTime() const;
 
 	const crl::weak_on_queue<VideoTrackObject> _weak;
-	const PlaybackOptions _options;
+	PlaybackOptions _options;
 
 	// Main thread wrapper destructor will set _shared back to nullptr.
 	// All queued method calls after that should be discarded.
@@ -75,7 +72,7 @@ private:
 	Fn<void()> _error;
 	crl::time _pausedTime = kTimeUnknown;
 	crl::time _resumedTime = kTimeUnknown;
-	mutable TimeCorrection _timeCorrection;
+	mutable TimePoint _syncTimePoint;
 	mutable crl::time _previousFramePosition = kTimeUnknown;
 	rpl::variable<crl::time> _nextFrameDisplayTime = kTimeUnknown;
 
@@ -109,10 +106,11 @@ rpl::producer<crl::time> VideoTrackObject::displayFrameAt() const {
 }
 
 void VideoTrackObject::process(Packet &&packet) {
-	_noMoreData = packet.empty();
 	if (interrupted()) {
 		return;
-	} else if (_shared->initialized()) {
+	}
+	_noMoreData = packet.empty();
+	if (_shared->initialized()) {
 		_stream.queue.push_back(std::move(packet));
 		queueReadFrames();
 	} else if (!tryReadFirstFrame(std::move(packet))) {
@@ -136,7 +134,7 @@ void VideoTrackObject::readFrames() {
 	if (interrupted()) {
 		return;
 	}
-	const auto state = _shared->prepareState(trackTime().trackNow);
+	const auto state = _shared->prepareState(trackTime().trackTime);
 	state.match([&](Shared::PrepareFrame frame) {
 		if (readFrame(frame)) {
 			presentFrameIfNeeded();
@@ -185,38 +183,55 @@ void VideoTrackObject::presentFrameIfNeeded() {
 		return;
 	}
 	const auto time = trackTime();
-	const auto presented = _shared->presentFrame(time.trackNow);
+	const auto presented = _shared->presentFrame(time.trackTime);
 	if (presented.displayPosition != kTimeUnknown) {
-		const auto trackLeft = presented.displayPosition - time.trackNow;
-		_nextFrameDisplayTime = time.worldNow
+		const auto trackLeft = presented.displayPosition - time.trackTime;
+		_nextFrameDisplayTime = time.worldTime
 			+ crl::time(std::round(trackLeft / _options.speed));
 	}
 	queueReadFrames(presented.nextCheckDelay);
 }
 
 void VideoTrackObject::pause(crl::time time) {
-	Expects(_timeCorrection.valid());
+	Expects(_syncTimePoint.valid());
 
-	if (_pausedTime == kTimeUnknown) {
+	if (interrupted()) {
+		return;
+	} else if (_pausedTime == kTimeUnknown) {
 		_pausedTime = time;
 	}
 }
 
 void VideoTrackObject::resume(crl::time time) {
-	Expects(_timeCorrection.trackTime != kTimeUnknown);
+	Expects(_syncTimePoint.trackTime != kTimeUnknown);
+
+	if (interrupted()) {
+		return;
+	}
 
 	// Resumed time used to validate sync to audio.
 	_resumedTime = time;
 	if (_pausedTime != kTimeUnknown) {
 		Assert(_pausedTime <= time);
-		_timeCorrection.worldTime += (time - _pausedTime);
+		_syncTimePoint.worldTime += (time - _pausedTime);
 		_pausedTime = kTimeUnknown;
 	} else {
-		_timeCorrection.worldTime = time;
+		_syncTimePoint.worldTime = time;
 	}
 	queueReadFrames();
 
-	Ensures(_timeCorrection.valid());
+	Ensures(_syncTimePoint.valid());
+	Ensures(_pausedTime == kTimeUnknown);
+}
+
+void VideoTrackObject::setSpeed(float64 speed) {
+	if (interrupted()) {
+		return;
+	}
+	if (_syncTimePoint.valid()) {
+		_syncTimePoint = trackTime();
+	}
+	_options.speed = speed;
 }
 
 bool VideoTrackObject::interrupted() const {
@@ -224,6 +239,9 @@ bool VideoTrackObject::interrupted() const {
 }
 
 void VideoTrackObject::frameDisplayed() {
+	if (interrupted()) {
+		return;
+	}
 	queueReadFrames();
 }
 
@@ -246,7 +264,7 @@ bool VideoTrackObject::tryReadFirstFrame(Packet &&packet) {
 	if (frame.isNull()) {
 		return false;
 	}
-	_shared->init(std::move(frame), _timeCorrection.trackTime);
+	_shared->init(std::move(frame), _syncTimePoint.trackTime);
 	callReady();
 	if (!_stream.queue.empty()) {
 		queueReadFrames();
@@ -267,13 +285,13 @@ crl::time VideoTrackObject::currentFramePosition() const {
 }
 
 bool VideoTrackObject::fillStateFromFrame() {
-	Expects(_timeCorrection.trackTime == kTimeUnknown);
+	Expects(_syncTimePoint.trackTime == kTimeUnknown);
 
 	const auto position = currentFramePosition();
 	if (position == kTimeUnknown) {
 		return false;
 	}
-	_nextFrameDisplayTime = _timeCorrection.trackTime = position;
+	_nextFrameDisplayTime = _syncTimePoint.trackTime = position;
 	return true;
 }
 
@@ -291,31 +309,34 @@ void VideoTrackObject::callReady() {
 	data.cover = frame->original;
 	data.rotation = _stream.rotation;
 	data.state.duration = _stream.duration;
-	data.state.position = _timeCorrection.trackTime;
+	data.state.position = _syncTimePoint.trackTime;
 	data.state.receivedTill = _noMoreData
 		? _stream.duration
-		: _timeCorrection.trackTime;
+		: _syncTimePoint.trackTime;
 	base::take(_ready)({ data });
 }
 
-VideoTrackObject::TrackTime VideoTrackObject::trackTime() const {
-	auto result = TrackTime();
-	result.worldNow = crl::now();
-	if (!_timeCorrection) {
-		result.trackNow = _timeCorrection.trackTime;
+TimePoint VideoTrackObject::trackTime() const {
+	auto result = TimePoint();
+	result.worldTime = (_pausedTime != kTimeUnknown)
+		? _pausedTime
+		: crl::now();
+	if (!_syncTimePoint) {
+		result.trackTime = _syncTimePoint.trackTime;
 		return result;
 	}
 
+	Assert(_resumedTime != kTimeUnknown);
 	if (_options.syncVideoByAudio && _audioId.playId()) {
 		const auto mixer = Media::Player::mixer();
-		const auto correction = mixer->getVideoTimeCorrection(_audioId);
-		if (correction && correction.worldTime > _resumedTime) {
-			_timeCorrection = correction;
+		const auto point = mixer->getVideoSyncTimePoint(_audioId);
+		if (point && point.worldTime > _resumedTime) {
+			_syncTimePoint = point;
 		}
 	}
-	const auto sinceKnown = (result.worldNow - _timeCorrection.worldTime);
-	result.trackNow = _timeCorrection.trackTime
-		+ crl::time(std::round(sinceKnown * _options.speed));
+	const auto adjust = (result.worldTime - _syncTimePoint.worldTime);
+	result.trackTime = _syncTimePoint.trackTime
+		+ crl::time(std::round(adjust * _options.speed));
 	return result;
 }
 
@@ -517,6 +538,12 @@ void VideoTrack::resume(crl::time time) {
 	});
 }
 
+void VideoTrack::setSpeed(float64 speed) {
+	_wrapped.with([=](Implementation &unwrapped) {
+		unwrapped.setSpeed(speed);
+	});
+}
+
 crl::time VideoTrack::markFrameDisplayed(crl::time now) {
 	const auto position = _shared->markFrameDisplayed(now);
 	if (position != kTimeUnknown) {

Telegram/SourceFiles/media/streaming/media_streaming_video_track.h

@@ -40,6 +40,9 @@ public:
 	void pause(crl::time time);
 	void resume(crl::time time);
 
+	// Called from the main thread.
+	void setSpeed(float64 speed);
+
 	// Called from the main thread.
 	// Returns the position of the displayed frame.
 	[[nodiscard]] crl::time markFrameDisplayed(crl::time now);