QMediaStreamsControl Class

The QMediaStreamsControl class provides a media stream selection control. 更多...

头：	#include <QMediaStreamsControl>
qmake:	QT += multimedia
继承：	QMediaControl

该类已过时。 提供它是为使旧源代码能继续工作。强烈建议不要在新代码中使用它。

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公共类型

enum	StreamType { AudioStream, VideoStream, SubPictureStream, UnknownStream, DataStream }

公共函数

virtual	~QMediaStreamsControl ()
virtual bool	isActive (int streamNumber ) = 0
virtual QVariant	metaData (int streamNumber , const QString & key ) = 0
virtual void	setActive (int streamNumber , bool state ) = 0
virtual int	streamCount () = 0
virtual QMediaStreamsControl::StreamType	streamType (int streamNumber ) = 0

信号

void	activeStreamsChanged ()
void	streamsChanged ()

保护函数

QMediaStreamsControl (QObject * parent = nullptr)

宏

QMediaStreamsControl_iid

详细描述

The QMediaStreamsControl class provides descriptions of the available media streams and allows individual streams to be activated and deactivated.

The interface name of QMediaStreamsControl is org.qt-project.qt.mediastreamscontrol/5.0 作为定义在 QMediaStreamsControl_iid .

另请参阅 QMediaService::requestControl ().

成员类型文档编制

enum QMediaStreamsControl:: StreamType

Media stream type.

常量	值	描述
QMediaStreamsControl::AudioStream	2	Audio stream.
QMediaStreamsControl::VideoStream	1	Video stream.
QMediaStreamsControl::SubPictureStream	3	Subpicture or teletext stream.
QMediaStreamsControl::UnknownStream	0	The stream type is unknown.
QMediaStreamsControl::DataStream	4

成员函数文档编制

[protected] QMediaStreamsControl:: QMediaStreamsControl ( QObject * parent = nullptr)

Constructs a new media streams control with the given parent .

[signal] void QMediaStreamsControl:: activeStreamsChanged ()

The signal is emitted when the active streams list is changed.

[signal] void QMediaStreamsControl:: streamsChanged ()

The signal is emitted when the available streams list is changed.

[虚拟] QMediaStreamsControl:: ~QMediaStreamsControl ()

Destroys a media streams control.

[pure virtual] bool QMediaStreamsControl:: isActive ( int streamNumber )

Returns true if the media stream streamNumber is active.

[pure virtual] QVariant QMediaStreamsControl:: metaData ( int streamNumber , const QString & key )

Returns the meta-data value of key 为给定 streamNumber .

Useful metadata keys are QMediaMetaData::Title, QMediaMetaData::Description and QMediaMetaData::Language.

[pure virtual] void QMediaStreamsControl:: setActive ( int streamNumber , bool state )

Sets the active state of media stream streamNumber .

Setting the active state of a media stream to true will activate it. If any other stream of the same type was previously active it will be deactivated. Setting the active state fo a media stream to false will deactivate it.

另请参阅 isActive ().

[pure virtual] int QMediaStreamsControl:: streamCount ()

Returns the number of media streams.

[pure virtual] QMediaStreamsControl::StreamType QMediaStreamsControl:: streamType ( int streamNumber )

Return the type of media stream streamNumber .

宏文档编制

QMediaStreamsControl_iid

org.qt-project.qt.mediastreamscontrol/5.0

定义接口名为 QMediaStreamsControl 类。

内容

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