qplatformmediaplayer_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
 
//
//  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.
//
 
#ifndef QMEDIAPLAYERCONTROL_H
#define QMEDIAPLAYERCONTROL_H
 
#include <QtMultimedia/qmediaplayer.h>
#include <QtMultimedia/qmediatimerange.h>
#include <QtMultimedia/qaudiodevice.h>
#include <QtMultimedia/qmediametadata.h>
 
#include <QtCore/qpair.h>
#include <QtCore/private/qglobal_p.h>
 
QT_BEGIN_NAMESPACE
 
class QMediaStreamsControl;
class QPlatformAudioOutput;
 
class Q_MULTIMEDIA_EXPORT QPlatformMediaPlayer
{
public:
    virtual ~QPlatformMediaPlayer();
    virtual QMediaPlayer::PlaybackState state() const { return m_state; }
    virtual QMediaPlayer::MediaStatus mediaStatus() const { return m_status; };
 
    virtual qint64 duration() const = 0;
 
    virtual qint64 position() const { return m_position; }
    virtual void setPosition(qint64 position) = 0;
 
    virtual float bufferProgress() const = 0;
 
    virtual bool isAudioAvailable() const { return m_audioAvailable; }
    virtual bool isVideoAvailable() const { return m_videoAvailable; }
 
    virtual bool isSeekable() const { return m_seekable; }
 
    virtual QMediaTimeRange availablePlaybackRanges() const = 0;
 
    virtual qreal playbackRate() const = 0;
    virtual void setPlaybackRate(qreal rate) = 0;
 
    virtual QUrl media() const = 0;
    virtual const QIODevice *mediaStream() const = 0;
    virtual void setMedia(const QUrl &media, QIODevice *stream) = 0;
 
    virtual void play() = 0;
    virtual void pause() = 0;
    virtual void stop() = 0;
 
    virtual bool streamPlaybackSupported() const { return false; }
 
    virtual void setAudioOutput(QPlatformAudioOutput *) {}
 
    virtual QMediaMetaData metaData() const { return {}; }
 
    virtual void setVideoSink(QVideoSink * /*sink*/) = 0;
 
    // media streams
    enum TrackType { VideoStream, AudioStream, SubtitleStream, NTrackTypes };
 
    virtual int trackCount(TrackType) { return 0; };
    virtual QMediaMetaData trackMetaData(TrackType /*type*/, int /*streamNumber*/) { return QMediaMetaData(); }
    virtual int activeTrack(TrackType) { return -1; }
    virtual void setActiveTrack(TrackType, int /*streamNumber*/) {}
 
    void durationChanged(qint64 duration) { emit player->durationChanged(duration); }
    void positionChanged(qint64 position) {
        if (m_position == position)
            return;
        m_position = position;
        emit player->positionChanged(position);
    }
    void audioAvailableChanged(bool audioAvailable) {
        if (m_audioAvailable == audioAvailable)
            return;
        m_audioAvailable = audioAvailable;
        emit player->hasAudioChanged(audioAvailable);
    }
    void videoAvailableChanged(bool videoAvailable) {
        if (m_videoAvailable == videoAvailable)
            return;
        m_videoAvailable = videoAvailable;
        emit player->hasVideoChanged(videoAvailable);
    }
    void seekableChanged(bool seekable) {
        if (m_seekable == seekable)
            return;
        m_seekable = seekable;
        emit player->seekableChanged(seekable);
    }
    void playbackRateChanged(qreal rate) { emit player->playbackRateChanged(rate); }
    void bufferProgressChanged(float progress) { emit player->bufferProgressChanged(progress); }
    void metaDataChanged() { emit player->metaDataChanged(); }
    void tracksChanged() { emit player->tracksChanged(); }
    void activeTracksChanged() { emit player->activeTracksChanged(); }
 
    void stateChanged(QMediaPlayer::PlaybackState newState);
    void mediaStatusChanged(QMediaPlayer::MediaStatus status);
    void error(int error, const QString &errorString);
 
    void resetCurrentLoop() { m_currentLoop = 0; }
    bool doLoop() {
        return isSeekable() && (m_loops < 0 || ++m_currentLoop < m_loops);
    }
    int loops() { return m_loops; }
    virtual void setLoops(int loops)
    {
        if (m_loops == loops)
            return;
        m_loops = loops;
        Q_EMIT player->loopsChanged();
    }
 
protected:
    explicit QPlatformMediaPlayer(QMediaPlayer *parent = nullptr);
 
private:
    QMediaPlayer *player = nullptr;
    QMediaPlayer::MediaStatus m_status = QMediaPlayer::NoMedia;
    QMediaPlayer::PlaybackState m_state = QMediaPlayer::StoppedState;
    bool m_seekable = false;
    bool m_videoAvailable = false;
    bool m_audioAvailable = false;
    int m_loops = 1;
    int m_currentLoop = 0;
    qint64 m_position = 0;
};
 
QT_END_NAMESPACE
 
 
#endif  // QMEDIAPLAYERCONTROL_H