内容

公共函数
信号
静态公共成员
详细描述

QVideoProbe 类

The QVideoProbe class allows you to monitor video frames being played or recorded. 更多...

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

公共函数

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

31 公共函数继承自 QObject

信号

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

2 信号继承自 QObject

静态公共成员

const QMetaObject

staticMetaObject

9 静态公共成员继承自 QObject

额外继承成员

1 特性继承自 QObject
1 公共槽继承自 QObject
9 保护函数继承自 QObject

详细描述

The QVideoProbe class allows you to monitor video frames being played or recorded.

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)

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

`[虚拟]` QVideoProbe:: ~QVideoProbe ()

销毁此探针并断开来自任何媒体对象的连接。

`[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.

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.