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