qffmpegdemuxer_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 QFFMPEGDEMUXER_P_H

#define QFFMPEGDEMUXER_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/qffmpegplaybackengineobject_p.h>

#include <QtFFmpegMediaPluginImpl/private/qffmpegpacket_p.h>

#include <QtFFmpegMediaPluginImpl/private/qffmpegplaybackutils_p.h>

#include <QtFFmpegMediaPluginImpl/private/qffmpegtime_p.h>

#include <QtMultimedia/private/qplatformmediaplayer_p.h>

#include <unordered_map>

QT_BEGIN_NAMESPACE

namespace QFFmpeg {

class Demuxer : public PlaybackEngineObject

    Q_OBJECT

public:

    using TrackType = QPlatformMediaPlayer::TrackType;

    Demuxer(const PlaybackEngineObjectID &id, AVFormatContext *context, TrackPosition initialPosUs,

            bool seekPending, const LoopOffset &loopOffset, const StreamIndexes &streamIndexes,

            int loops);

    void seek(quint64 sessionId, TrackPosition initialPosUs, const LoopOffset &loopOffset);

    using RequestingSignal = void (Demuxer::*)(Packet);

    static RequestingSignal signalByTrackType(TrackType trackType);

    void setLoops(int loopsCount);

public Q_SLOTS:

    void onPacketProcessed(const Packet &);

Q_SIGNALS:

    void requestProcessAudioPacket(Packet);

    void requestProcessVideoPacket(Packet);

    void requestProcessSubtitlePacket(Packet);

    void firstPacketFound(PlaybackEngineObjectID id, TrackPosition absSeekPos);

    void packetsBuffered();

protected:

    TimePoint nextTimePoint() const override;

private:

    bool canDoNextStep() const override;

    void doNextStep() override;

    void ensureSeeked();

private:

    struct StreamData

        TrackType trackType;

        TrackDuration bufferedDuration = TrackDuration(0);

        qint64 bufferedSize = 0;

        TrackPosition maxSentPacketsPos = TrackPosition(0);

        TrackPosition maxProcessedPacketPos = TrackPosition(0);

        bool isDataLimitReached = false;

};

    void updateStreamDataLimitFlag(StreamData &streamData);

private:

    AVFormatContext *m_context = nullptr;

    struct SessionContext

        TrackPosition posInLoopUs = TrackPosition(0); // Position in current loop in [0, duration()]

        LoopOffset loopOffset = {};

        bool seeked = false;

        bool firstPacketFound = false;

        bool buffered = false;

        TrackPosition maxPacketsEndPos = TrackPosition(0);

        qsizetype demuxerRetryCount = 0;

        std::optional<TimePoint> failTimePoint = {};

};

    SessionContext m_sessionCtx;

    std::unordered_map<int, StreamData> m_streams;

    QAtomicInt m_loops = QMediaPlayer::Once;

    static constexpr qsizetype s_maxDemuxerRetries = 10; // Arbitrarily chosen

    static constexpr std::chrono::milliseconds s_demuxerRetryInterval = std::chrono::milliseconds(10);

};

} // namespace QFFmpeg

QT_END_NAMESPACE // QFFMPEGDEMUXER_P_H

#endif