135 lines
3.5 KiB
C++
135 lines
3.5 KiB
C++
/*
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This file is part of Telegram Desktop,
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the official desktop application for the Telegram messaging service.
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For license and copyright information please follow this link:
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https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
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*/
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#pragma once
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#include "media/streaming/media_streaming_utility.h"
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#include <crl/crl_object_on_queue.h>
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namespace Media {
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namespace Streaming {
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class VideoTrackObject;
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class VideoTrack final {
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public:
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// Called from some unspecified thread.
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// Callbacks are assumed to be thread-safe.
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VideoTrack(
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const PlaybackOptions &options,
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Stream &&stream,
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const AudioMsgId &audioId,
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FnMut<void(const Information &)> ready,
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Fn<void()> error);
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// Thread-safe.
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[[nodiscard]] int streamIndex() const;
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[[nodiscard]] AVRational streamTimeBase() const;
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[[nodiscard]] crl::time streamDuration() const;
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// Called from the same unspecified thread.
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void process(Packet &&packet);
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void waitForData();
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// Called from the main thread.
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// Must be called after 'ready' was invoked.
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void pause(crl::time time);
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void resume(crl::time time);
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// Called from the main thread.
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void setSpeed(float64 speed);
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// Called from the main thread.
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// Returns the position of the displayed frame.
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[[nodiscard]] crl::time markFrameDisplayed(crl::time now);
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[[nodiscard]] QImage frame(const FrameRequest &request);
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[[nodiscard]] rpl::producer<crl::time> renderNextFrame() const;
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[[nodiscard]] rpl::producer<> waitingForData() const;
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// Called from the main thread.
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~VideoTrack();
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private:
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friend class VideoTrackObject;
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struct Frame {
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FramePointer decoded = MakeFramePointer();
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QImage original;
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crl::time position = kTimeUnknown;
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crl::time displayed = kTimeUnknown;
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FrameRequest request;
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QImage prepared;
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};
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class Shared {
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public:
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using PrepareFrame = not_null<Frame*>;
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using PrepareNextCheck = crl::time;
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using PrepareState = base::optional_variant<
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PrepareFrame,
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PrepareNextCheck>;
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struct PresentFrame {
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crl::time displayPosition = kTimeUnknown;
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crl::time nextCheckDelay = 0;
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};
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// Called from the wrapped object queue.
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void init(QImage &&cover, crl::time position);
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[[nodiscard]] bool initialized() const;
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[[nodiscard]] PrepareState prepareState(
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crl::time trackTime,
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bool dropStaleFrames);
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// PrepareCallback(not_null<Frame*>).
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template <typename PrepareCallback>
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[[nodiscard]] PresentFrame presentFrame(
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crl::time trackTime,
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PrepareCallback &&prepare);
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// Called from the main thread.
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// Returns the position of the displayed frame.
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[[nodiscard]] crl::time markFrameDisplayed(crl::time now);
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[[nodiscard]] not_null<Frame*> frameForPaint();
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private:
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[[nodiscard]] not_null<Frame*> getFrame(int index);
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[[nodiscard]] int counter() const;
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static constexpr auto kCounterUninitialized = -1;
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std::atomic<int> _counter = kCounterUninitialized;
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static constexpr auto kFramesCount = 4;
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std::array<Frame, kFramesCount> _frames;
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};
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static QImage PrepareFrameByRequest(
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not_null<Frame*> frame,
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bool useExistingPrepared = false);
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[[nodiscard]] static bool IsDecoded(not_null<Frame*> frame);
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[[nodiscard]] static bool IsPrepared(not_null<Frame*> frame);
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[[nodiscard]] static bool IsStale(
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not_null<Frame*> frame,
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crl::time trackTime);
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const int _streamIndex = 0;
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const AVRational _streamTimeBase;
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const crl::time _streamDuration = 0;
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//const int _streamRotation = 0;
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std::unique_ptr<Shared> _shared;
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using Implementation = VideoTrackObject;
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crl::object_on_queue<Implementation> _wrapped;
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};
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} // namespace Streaming
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} // namespace Media
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