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Telegram/SourceFiles/media/streaming/media_streaming_audio_track.h

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+/*
+This file is part of Telegram Desktop,
+the official desktop application for the Telegram messaging service.
+
+For license and copyright information please follow this link:
+https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
+*/
+#pragma once
+
+#include "media/streaming/media_streaming_utility.h"
+
+namespace Media {
+namespace Streaming {
+
+class AudioTrack final {
+public:
+	// Called from some unspecified thread.
+	// Callbacks are assumed to be thread-safe.
+	AudioTrack(
+		const PlaybackOptions &options,
+		Stream &&stream,
+		AudioMsgId audioId,
+		FnMut<void(const Information &)> ready,
+		Fn<void(Error)> error);
+
+	// Called from the main thread.
+	// Must be called after 'ready' was invoked.
+	void pause(crl::time time);
+	void resume(crl::time time);
+
+	// Allow to irreversibly stop only audio track.
+	void stop();
+
+	// Called from the main thread.
+	void setSpeed(float64 speed);
+	[[nodiscard]] rpl::producer<> waitingForData() const;
+
+	// Called from the main thread.
+	// Non-const, because we subscribe to changes on the first call.
+	// Must be called after 'ready' was invoked.
+	[[nodiscard]] rpl::producer<crl::time> playPosition();
+
+	// Thread-safe.
+	[[nodiscard]] int streamIndex() const;
+	[[nodiscard]] AVRational streamTimeBase() const;
+	[[nodiscard]] crl::time streamDuration() const;
+
+	// Called from the same unspecified thread.
+	void process(std::vector<FFmpeg::Packet> &&packets);
+	void waitForData();
+
+	// Called from the main thread.
+	~AudioTrack();
+
+private:
+	// Called from the same unspecified thread.
+	[[nodiscard]] bool initialized() const;
+	[[nodiscard]] bool tryReadFirstFrame(FFmpeg::Packet &&packet);
+	[[nodiscard]] bool fillStateFromFrame();
+	[[nodiscard]] bool processFirstFrame();
+	void mixerInit();
+	void mixerEnqueue(gsl::span<FFmpeg::Packet> packets);
+	void mixerForceToBuffer();
+	void callReady();
+
+	PlaybackOptions _options;
+
+	// Accessed from the same unspecified thread.
+	Stream _stream;
+	const AudioMsgId _audioId;
+	bool _readTillEnd = false;
+
+	// Assumed to be thread-safe.
+	FnMut<void(const Information &)> _ready;
+	const Fn<void(Error)> _error;
+
+	// First set from the same unspecified thread before _ready is called.
+	// After that is immutable.
+	crl::time _startedPosition = kTimeUnknown;
+
+	// Accessed from the main thread.
+	rpl::lifetime _subscription;
+	rpl::event_stream<> _waitingForData;
+	// First set from the same unspecified thread before _ready is called.
+	// After that accessed from the main thread.
+	rpl::variable<crl::time> _playPosition;
+
+	// For initial frame skipping for an exact seek.
+	FFmpeg::FramePointer _initialSkippingFrame;
+
+};
+
+} // namespace Streaming
+} // namespace Media