qt-everywhere-src-5.14.1/qtmultimedia/src/gsttools/qgstreamervideooverlay_p.h

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#ifndef QGSTREAMERVIDEOOVERLAY_P_H
#define QGSTREAMERVIDEOOVERLAY_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 <private/qgstreamerbushelper_p.h>
#include <private/qgstreamerbufferprobe_p.h>
#include <QtGui/qwindowdefs.h>
#include <QtCore/qsize.h>

QT_BEGIN_NAMESPACE

class QGstreamerSinkProperties;
class QGstreamerVideoOverlay
        : public QObject
        , public QGstreamerSyncMessageFilter
        , public QGstreamerBusMessageFilter
        , private QGstreamerBufferProbe
{
    Q_OBJECT
    Q_INTERFACES(QGstreamerSyncMessageFilter QGstreamerBusMessageFilter)
public:
    explicit QGstreamerVideoOverlay(QObject *parent = 0, const QByteArray &elementName = QByteArray());
    virtual ~QGstreamerVideoOverlay();

    GstElement *videoSink() const;
    void setVideoSink(GstElement *);
    QSize nativeVideoSize() const;

    void setWindowHandle(WId id);
    void expose();
    void setRenderRectangle(const QRect &rect);

    bool isActive() const;

    Qt::AspectRatioMode aspectRatioMode() const;
    void setAspectRatioMode(Qt::AspectRatioMode mode);

    int brightness() const;
    void setBrightness(int brightness);

    int contrast() const;
    void setContrast(int contrast);

    int hue() const;
    void setHue(int hue);

    int saturation() const;
    void setSaturation(int saturation);

    bool processSyncMessage(const QGstreamerMessage &message) override;
    bool processBusMessage(const QGstreamerMessage &message) override;

Q_SIGNALS:
    void nativeVideoSizeChanged();
    void activeChanged();
    void brightnessChanged(int brightness);
    void contrastChanged(int contrast);
    void hueChanged(int hue);
    void saturationChanged(int saturation);

private:
    void setWindowHandle_helper(WId id);
    void updateIsActive();
    void probeCaps(GstCaps *caps) override;
    static void showPrerollFrameChanged(GObject *, GParamSpec *, QGstreamerVideoOverlay *);

    GstElement *m_videoSink = nullptr;
    QSize m_nativeVideoSize;
    bool m_isActive = false;

    QGstreamerSinkProperties *m_sinkProperties = nullptr;
    WId m_windowId = 0;
};

QT_END_NAMESPACE

#endif // QGSTREAMERVIDEOOVERLAY_P_H