qffmpegstreamdecoder_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 QFFMPEGSTREAMDECODER_P_H

#define QFFMPEGSTREAMDECODER_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/qffmpegplaybackengineobject_p.h>

#include <QtFFmpegMediaPluginImpl/private/qffmpegframe_p.h>

#include <QtFFmpegMediaPluginImpl/private/qffmpegpacket_p.h>

#include <QtFFmpegMediaPluginImpl/private/qffmpegplaybackutils_p.h>

#include <QtMultimedia/private/qplatformmediaplayer_p.h>

#include <QtCore/qqueue.h>

QT_BEGIN_NAMESPACE

namespace QFFmpeg {

class StreamDecoder : public PlaybackEngineObject

    Q_OBJECT

public:

    using TrackType = QPlatformMediaPlayer::TrackType;

    StreamDecoder(const PlaybackEngineObjectID &id, const CodecContext &codecContext,

                  TrackPosition absSeekPos);

    ~StreamDecoder() override;

    void seek(quint64 sessionID, TrackPosition pos, const LoopOffset &offset);

    TrackType trackType() const;

    // Maximum number of frames that we are allowed to keep in render queue

    static qint32 maxQueueSize(TrackType type);

public Q_SLOTS:

    void decode(Packet);

    void onFinalPacketReceived(PlaybackEngineObjectID sourceID);

    void onFrameProcessed(const Frame &frame);

Q_SIGNALS:

    void requestHandleFrame(Frame frame);

    void packetProcessed(Packet);

protected:

    bool canDoNextStep() const override;

    void doNextStep() override;

private:

    void decodeMedia(const Packet &packet);

    void decodeSubtitle(const Packet &packet);

    void onFrameFound(const Frame &frame);

    int sendAVPacket(const Packet &packet);

    void receiveAVFrames(bool flushPacket = false);

private:

    CodecContext m_codecContext;

    const TrackType m_trackType;

    struct SessionContext

        TrackPosition absSeekPos = TrackPosition(0);

        qint32 pendingFramesCount = 0;

        LoopOffset offset = {};

        QQueue<Packet> packets = {};

};

    SessionContext m_sessionCtx;

};

QString subtitleTextFromAVSubtitle(const AVSubtitle &subtitle);

} // namespace QFFmpeg

QT_END_NAMESPACE

#endif // QFFMPEGSTREAMDECODER_P_H