qffmpegvideoencoder_p.h

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// Copyright (C) 2024 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QFFMPEGVIDEOENCODER_P_H
#define QFFMPEGVIDEOENCODER_P_H
 
//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
 
#include <QtFFmpegMediaPluginImpl/private/qffmpegencoderthread_p.h>
#include <QtFFmpegMediaPluginImpl/private/qffmpeg_p.h>
#include <QtFFmpegMediaPluginImpl/private/qffmpegvideoframeencoder_p.h>
#include <QtFFmpegMediaPluginImpl/private/qffmpegframerateadapter_p.h>
#include <qvideoframe.h>
#include <queue>
 
QT_BEGIN_NAMESPACE
 
class QVideoFrameFormat;
class QMediaEncoderSettings;
 
namespace QFFmpeg {
class VideoFrameEncoder;
 
class VideoEncoder : public EncoderThread
{
public:
    VideoEncoder(RecordingEngine &recordingEngine, const QMediaEncoderSettings &settings,
                 const QVideoFrameFormat &format, std::optional<AVPixelFormat> hwFormat);
    ~VideoEncoder() override;
 
    void addFrame(const QVideoFrame &frame);
 
protected:
    bool checkIfCanPushFrame() const override;
 
private:
    FrameInfo takeFrame();
    void retrievePackets();
 
    bool init() override;
    void cleanup() override;
    bool hasData() const override;
    void processOne() override;
 
    std::pair<qint64, qint64> frameTimeStamps(const QVideoFrame &frame) const;
 
    QMediaEncoderSettings m_settings;
    VideoFrameEncoder::SourceParams m_sourceParams;
    std::queue<FrameInfo> m_videoFrameQueue;
    const size_t m_maxQueueSize = 10; // Arbitrarily chosen to limit memory usage (332 MB @ 4K)
 
    VideoFrameEncoderUPtr m_frameEncoder;
    qint64 m_baseTime = 0;
    bool m_shouldAdjustTimeBaseForNextFrame = true;
    qint64 m_lastFrameTime = 0;
 
    std::optional<qreal> m_fixedSourceFrameRate; // nullopt = variable-rate source
    FrameRateAdapter m_frameRateAdapter;
 
    // Frames that arrive via addFrame() before init() has configured m_frameRateAdapter
    // with the negotiated codec frame rate. Adapted once init() runs.
    std::queue<QVideoFrame> m_framesBeforeInit;
    const size_t m_maxFramesBeforeInit = 10; // Arbitrarily chosen, same rationale as m_maxQueueSize
};
 
} // namespace QFFmpeg
 
QT_END_NAMESPACE
 
#endif