Question

我正在使用qt示例中的媒体播放器示例，我正在尝试创建自定义视频表面。我希望能够实时操纵帧对它们进行一些操作（例如高斯滤波器）。我的视频表面代码如下所示：

QList<QVideoFrame::PixelFormat> VideoSurface::supportedPixelFormats(
        QAbstractVideoBuffer::HandleType handleType) const
{

Q_UNUSED(handleType);

       // Return the formats you will support
       return QList<QVideoFrame::PixelFormat>() << QVideoFrame::Format_RGB565;
}

bool VideoSurface::present(const QVideoFrame &frame)
    {
        Q_UNUSED(frame);
        // Handle the frame and do your processing
    return true;
}

我是否需要实现启动功能才能使其工作？我的播放器代码如下所示：

    player = new QMediaPlayer(this);
    // owned by PlaylistModel
    playlist = new QMediaPlaylist();
    player->setPlaylist(playlist);

    /*
    QVideoRendererControl* rendererControl = player->service()->requestControl<QVideoRendererControl*>();

    if (rendererControl)
            rendererControl->setSurface(videoSurf);
    else
            qDebug() << "QtVideoSource: Unable to get QVideoRenderControl for video integration. No video will be emitted from this video source.";
    */

//! [create-objs]

    connect(player, SIGNAL(durationChanged(qint64)), SLOT(durationChanged(qint64)));
    connect(player, SIGNAL(positionChanged(qint64)), SLOT(positionChanged(qint64)));
    connect(player, SIGNAL(metaDataChanged()), SLOT(metaDataChanged()));
    connect(playlist, SIGNAL(currentIndexChanged(int)), SLOT(playlistPositionChanged(int)));
    connect(player, SIGNAL(mediaStatusChanged(QMediaPlayer::MediaStatus)),
            this, SLOT(statusChanged(QMediaPlayer::MediaStatus)));
    connect(player, SIGNAL(bufferStatusChanged(int)), this, SLOT(bufferingProgress(int)));
    connect(player, SIGNAL(videoAvailableChanged(bool)), this, SLOT(videoAvailableChanged(bool)));
    connect(player, SIGNAL(error(QMediaPlayer::Error)), this, SLOT(displayErrorMessage()));


    VideoSurface* videoSurf = new VideoSurface();

    //Don't use video Widget, but the custom video surface
    videoWidget = new VideoWidget(this);

    player->setVideoOutput(videoSurf);

播放器启动，音频像往常一样工作，时间计数器像往常一样，但显示器是黑色的，没有视频。我该怎么做才能看到这些画面？另外，我很想知道QVideoRendererControl的注释部分。我从一些网站得到它并想知道，它是一种替代方法来操纵框架而不是现在的功能或它有什么用？提前谢谢

Answer 1

您不想使用QAbstractVideoSurface代替QAbstractVideoBuffer吗？在这种情况下，您还需要实现isFormatSupported和supportedPixelFormats函数。当然要开始吧。

如何在qtcreator中实现Qabstractvideosurface并监控每帧的视频？

1 个答案: