QVideoProbe 类

QVideoProbe 类允许监视视频帧播放或录制。更多...

头：	#include <QVideoProbe>
qmake:	QT += multimedia
继承：	QObject

所有成员列表，包括继承成员

公共函数

	QVideoProbe (QObject * parent = nullptr)
virtual	~QVideoProbe ()
bool	isActive () const
bool	setSource (QMediaObject * source )
bool	setSource (QMediaRecorder * mediaRecorder )

信号

void	flush ()
void	videoFrameProbed (const QVideoFrame & frame )

详细描述

QMediaPlayer *player = new QMediaPlayer();
QVideoProbe *probe = new QVideoProbe;
connect(probe, SIGNAL(videoFrameProbed(QVideoFrame)), this, SLOT(processFrame(QVideoFrame)));
probe->setSource(player); // Returns true, hopefully.
player->setVideoOutput(myVideoSurface);
player->setMedia(QUrl::fromLocalFile("observation.mp4"));
player->play(); // Start receiving frames as they get presented to myVideoSurface

This same approach works with the QCamera object as well, to receive viewfinder or video frames as they are captured.

另请参阅 QAudioProbe , QMediaPlayer ，和 QCamera .

成员函数文档编制

QVideoProbe:: QVideoProbe ( QObject * parent = nullptr)

创建新 QVideoProbe 类采用 parent . After setting the source to monitor with setSource ()， videoFrameProbed () signal will be emitted when video frames are flowing in the source media object.

`[signal]` void QVideoProbe:: flush ()

This signal should be emitted when it is required to release all frames. Application must release all outstanding references to video frames.

`[signal]` void QVideoProbe:: videoFrameProbed (const QVideoFrame & frame )

This signal should be emitted when a video frame is processed in the media service.

`[虚拟]` QVideoProbe:: ~QVideoProbe ()

销毁此探针并断开来自任何媒体对象的连接。

bool QVideoProbe:: isActive () const

Returns true if this probe is monitoring something, or false otherwise.

The source being monitored does not need to be active.

bool QVideoProbe:: setSource ( QMediaObject * source )

Sets the media object to monitor to source .

若 source is zero, this probe will be deactivated and this function wil return true.

If the media object does not support monitoring video, this function will return false.

Any previously monitored objects will no longer be monitored. Passing in the same object will be ignored, but monitoring will continue.

bool QVideoProbe:: setSource ( QMediaRecorder * mediaRecorder )

Starts monitoring the given mediaRecorder .

If there is no mediaObject associated with mediaRecorder , or if it is zero, this probe will be deactivated and this function wil return true.

If the media recorder instance does not support monitoring video, this function will return false.