qffmpeghwaccel_p.h

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// Copyright (C) 2021 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 QFFMPEGHWACCEL_P_H

#define QFFMPEGHWACCEL_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/qffmpeg_p.h>

#include <QtFFmpegMediaPluginImpl/private/qffmpegtextureconverter_p.h>

#include <QtMultimedia/qvideoframeformat.h>

#include <QtMultimedia/private/qhwvideobuffer_p.h>

#include <QtMultimedia/private/qrhivaluemapper_p.h>

#include <QtCore/qspan.h>

#include <memory>

#include <mutex>

QT_BEGIN_NAMESPACE

class QRhi;

class QRhiTexture;

class QFFmpegVideoBuffer;

namespace QFFmpeg {

// used for the get_format callback for the decoder

AVPixelFormat getFormat(AVCodecContext *s, const AVPixelFormat *fmt);

class HWAccel;

class HWAccel;

using HWAccelUPtr = std::unique_ptr<HWAccel>;

/**

 * @brief The HwFrameContextData class contains custom belongings

 *        of hw frames context.

*/

struct HwFrameContextData

    using AVHWFramesContextDeleter = void (*)(struct AVHWFramesContext *ctx);

    AVHWFramesContextDeleter avDeleter = nullptr;

    void *avUserOpaque = nullptr;

    QRhiValueMapper<TextureConverter> textureConverterMapper = {};

/**

     * @brief gets or creates an instance of the class, associated with

     *        the frames context of the specified frame. Note, AVFrame

     *        holds shared ownership of the frames context, so consider this

     *        when designing HwFrameContextData's lifetime.

*/

    static HwFrameContextData &ensure(AVFrame &hwFrame);

};

class HWAccel

    const AVBufferUPtr m_hwDeviceContext;

    AVBufferUPtr m_hwFramesContext;

    mutable std::once_flag m_constraintsOnceFlag;

    mutable AVHWFramesConstraintsUPtr m_constraints;

public:

    ~HWAccel();

    static HWAccelUPtr create(AVHWDeviceType deviceType);

    static std::pair<std::optional<Codec>, HWAccelUPtr> findDecoderWithHwAccel(AVCodecID id);

    AVHWDeviceType deviceType() const;

    AVBufferRef *hwDeviceContextAsBuffer() const { return m_hwDeviceContext.get(); }

    AVHWDeviceContext *hwDeviceContext() const;

    AVPixelFormat hwFormat() const;

    const AVHWFramesConstraints *constraints() const;

    bool matchesSizeContraints(QSize size) const;

    void createFramesContext(AVPixelFormat swFormat, const QSize &size);

    void destroyFramesContext();

    void updateFramesContext(AVPixelFormat swFormat, const QSize &size);

    AVBufferRef *hwFramesContextAsBuffer() const { return m_hwFramesContext.get(); }

    AVHWFramesContext *hwFramesContext() const;

    static AVPixelFormat format(AVFrame *frame);

    static QSpan<const AVHWDeviceType> encodingDeviceTypes();

    static QSpan<const AVHWDeviceType> decodingDeviceTypes();

private:

    HWAccel(AVBufferUPtr hwDeviceContext) : m_hwDeviceContext(std::move(hwDeviceContext)) { }

};

AVFrameUPtr copyFromHwPool(AVFrameUPtr frame);

} // namespace QFFmpeg

QT_END_NAMESPACE

#endif