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我正在使用qt示例中的媒体播放器示例,并试图创建自定义视频表面。我希望能够实时操纵这些帧来对它们进行一些操作(例如高斯滤波器)。 我的视频面的代码如下所示:如何在qtcreator中实现Qabstractvideosurface并监视每帧视频?
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;
}
我需要实现启动功能,得到它的工作? 我对球员的代码如下所示:
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);
播放器开始和音频就像往常一样,时间计数器去像往常一样,但显示为黑色,没有视频。我应该怎么做才能看到框架?此外,我会很想知道有关QVideoRendererControl的评论部分。我从一些网站得到它,并想知道,它是一种替代方法来操作框架而不是现在的功能,或者它有什么好处? 预先感谢您
你的意思是写'supportedPixelFormats(QAbstractVideoSurface handleType)const'吗?如果我这样做,我得到一个无法声明参数'handleType'为抽象类型'QAbstractVideoSurface' QAbstractVideoSurface handleType)const; 错误。你的意思是开始实施启动功能吗?我使用了[link](http://code.google.com/p/dviz/source/browse/trunk/src/glvidtex/QtVideoSource.cpp)的片段,但是我的视频采用了yuv420p格式,我无法转换它为qimage。我真的需要isFormatSupported吗?目前的功能被重复调用,我测试了一个打印命令。 – Rareform