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 "playbackengine/qffmpegplaybackengineobject_p.h"
#include "playbackengine/qffmpegframe_p.h"
#include "playbackengine/qffmpegpacket_p.h"
#include "playbackengine/qffmpegpositionwithoffset_p.h"
#include "private/qplatformmediaplayer_p.h"
 
#include <optional>
 
QT_BEGIN_NAMESPACE
 
namespace QFFmpeg {
 
class StreamDecoder : public PlaybackEngineObject
{
    Q_OBJECT
public:
    StreamDecoder(const Codec &codec, qint64 absSeekPos);
 
    ~StreamDecoder();
 
    QPlatformMediaPlayer::TrackType trackType() const;
 
    // Maximum number of frames that we are allowed to keep in render queue
    static qint32 maxQueueSize(QPlatformMediaPlayer::TrackType type);
 
public slots:
    void setInitialPosition(TimePoint tp, qint64 trackPos);
 
    void decode(Packet);
 
    void onFinalPacketReceived();
 
    void onFrameProcessed(Frame frame);
 
signals:
    void requestHandleFrame(Frame frame);
 
    void packetProcessed(Packet);
 
protected:
    bool canDoNextStep() const override;
 
    void doNextStep() override;
 
private:
    void decodeMedia(Packet);
 
    void decodeSubtitle(Packet);
 
    void onFrameFound(Frame frame);
 
    int sendAVPacket(Packet);
 
    void receiveAVFrames();
 
private:
    Codec m_codec;
    qint64 m_absSeekPos = 0;
    const QPlatformMediaPlayer::TrackType m_trackType;
 
    qint32 m_pendingFramesCount = 0;
 
    LoopOffset m_offset;
 
    QQueue<Packet> m_packets;
};
 
} // namespace QFFmpeg
 
QT_END_NAMESPACE
 
#endif // QFFMPEGSTREAMDECODER_P_H