qgstreamermediaplayer_p.h

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// Copyright (C) 2016 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 QGSTREAMERMEDIAPLAYER_P_H
#define QGSTREAMERMEDIAPLAYER_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 <QtCore/qstack.h>
#include <private/qplatformmediaplayer_p.h>
#include <private/qtmultimediaglobal_p.h>
#include <private/qmultimediautils_p.h>
#include <qurl.h>
#include <qgst_p.h>
#include <qgstpipeline_p.h>
 
#include <QtCore/qtimer.h>
 
#include <array>
 
QT_BEGIN_NAMESPACE
 
class QNetworkAccessManager;
class QGstreamerMessage;
class QGstAppSrc;
class QGstreamerAudioOutput;
class QGstreamerVideoOutput;
 
class Q_MULTIMEDIA_EXPORT QGstreamerMediaPlayer
    : public QObject,
      public QPlatformMediaPlayer,
      public QGstreamerBusMessageFilter,
      public QGstreamerSyncMessageFilter
{
    Q_OBJECT
 
public:
    static QMaybe<QPlatformMediaPlayer *> create(QMediaPlayer *parent = nullptr);
    ~QGstreamerMediaPlayer();
 
    qint64 position() const override;
    qint64 duration() const override;
 
    float bufferProgress() const override;
 
    QMediaTimeRange availablePlaybackRanges() const override;
 
    qreal playbackRate() const override;
    void setPlaybackRate(qreal rate) override;
 
    QUrl media() const override;
    const QIODevice *mediaStream() const override;
    void setMedia(const QUrl&, QIODevice *) override;
 
    bool streamPlaybackSupported() const override { return true; }
 
    void setAudioOutput(QPlatformAudioOutput *output) override;
 
    QMediaMetaData metaData() const override;
 
    void setVideoSink(QVideoSink *sink) override;
 
    int trackCount(TrackType) override;
    QMediaMetaData trackMetaData(TrackType /*type*/, int /*streamNumber*/) override;
    int activeTrack(TrackType) override;
    void setActiveTrack(TrackType, int /*streamNumber*/) override;
 
    void setPosition(qint64 pos) override;
 
    void play() override;
    void pause() override;
    void stop() override;
 
    bool processBusMessage(const QGstreamerMessage& message) override;
    bool processSyncMessage(const QGstreamerMessage& message) override;
 
public Q_SLOTS:
    void updatePosition() { positionChanged(position()); }
 
private:
    QGstreamerMediaPlayer(QGstreamerVideoOutput *videoOutput, QGstElement decodebin,
                          QGstElement videoInputSelector, QGstElement audioInputSelector,
                          QGstElement subTitleInputSelector, QMediaPlayer *parent);
 
    struct TrackSelector {
        TrackSelector(TrackType, QGstElement selector);
        QGstPad createInputPad();
        void removeInputPad(QGstPad pad);
        void removeAllInputPads();
        QGstPad inputPad(int index);
        int activeInputIndex() const { return isConnected ? tracks.indexOf(activeInputPad()) : -1; }
        QGstPad activeInputPad() const { return isConnected ? selector.getObject("active-pad") : QGstPad{}; }
        void setActiveInputPad(QGstPad input) { selector.set("active-pad", input); }
        int trackCount() const { return tracks.count(); }
 
        QGstElement selector;
        TrackType type;
        QList<QGstPad> tracks;
        bool isConnected = false;
    };
 
    friend class QGstreamerStreamsControl;
    void decoderPadAdded(const QGstElement &src, const QGstPad &pad);
    void decoderPadRemoved(const QGstElement &src, const QGstPad &pad);
    static void uridecodebinElementAddedCallback(GstElement *uridecodebin, GstElement *child, QGstreamerMediaPlayer *that);
    static void sourceSetupCallback(GstElement *uridecodebin, GstElement *source, QGstreamerMediaPlayer *that);
    void parseStreamsAndMetadata();
    void connectOutput(TrackSelector &ts);
    void removeOutput(TrackSelector &ts);
    void removeAllOutputs();
    void stopOrEOS(bool eos);
 
    std::array<TrackSelector, NTrackTypes> trackSelectors;
    TrackSelector &trackSelector(TrackType type);
 
    QMediaMetaData m_metaData;
 
    int m_bufferProgress = -1;
    QUrl m_url;
    QIODevice *m_stream = nullptr;
 
    bool prerolling = false;
    bool m_requiresSeekOnPlay = false;
    qint64 m_duration = 0;
    QTimer positionUpdateTimer;
 
    QGstAppSrc *m_appSrc = nullptr;
 
    GType decodebinType;
    QGstStructure topology;
 
    // Gst elements
    QGstPipeline playerPipeline;
    QGstElement src;
    QGstElement decoder;
 
    QGstreamerAudioOutput *gstAudioOutput = nullptr;
    QGstreamerVideoOutput *gstVideoOutput = nullptr;
 
    //    QGstElement streamSynchronizer;
 
    QHash<QByteArray, QGstPad> decoderOutputMap;
};
 
QT_END_NAMESPACE
 
#endif