内容

• 公共函数
• 公共槽
• 信号
• 保护函数
• 宏
• 详细描述

QMediaRecorderControl Class

The QMediaRecorderControl class provides access to the recording functionality of a QMediaService . 更多...

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

• 所有成员列表，包括继承成员

公共函数

virtual	~QMediaRecorderControl ()
virtual void	applySettings () = 0
virtual qint64	duration () const = 0
virtual bool	isMuted () const = 0
virtual QUrl	outputLocation () const = 0
virtual bool	setOutputLocation (const QUrl & location ) = 0
virtual QMediaRecorder::State	state () const = 0
virtual QMediaRecorder::Status	status () const = 0
virtual qreal	volume () const = 0

• 32 公共函数继承自 QObject

公共槽

virtual void	setMuted (bool muted ) = 0
virtual void	setState (QMediaRecorder::State state ) = 0
virtual void	setVolume (qreal volume ) = 0

• 1 公共槽继承自 QObject

信号

void	actualLocationChanged (const QUrl & location )
void	durationChanged (qint64 duration )
void	error (int error , const QString & errorString )
void	mutedChanged (bool muted )
void	stateChanged (QMediaRecorder::State state )
void	statusChanged (QMediaRecorder::Status status )
void	volumeChanged (qreal gain )

• 2 信号继承自 QObject

保护函数

QMediaRecorderControl (QObject * parent = Q_NULLPTR)

• 9 保护函数继承自 QObject

宏

QMediaRecorderControl_iid

额外继承成员

• 1 特性继承自 QObject
• 11 静态公共成员继承自 QObject

详细描述

The QMediaRecorderControl class provides access to the recording functionality of a QMediaService .

Generally you will use the QMediaRecorder class in application code - this class is mostly used when implementing a new QMediaService or if there is access to specific low level functionality not otherwise present in QMediaRecorder .

若 QMediaService can record media it will implement QMediaRecorderControl . This control provides a means to set the output location , and record, pause and stop recording via the setState () method. It also provides feedback on the duration of the recording.

接口名称对于 QMediaRecorderControl is org.qt-project.qt.mediarecordercontrol/5.0 作为定义在 QMediaRecorderControl_iid .

另请参阅 QMediaService::requestControl () 和 QMediaRecorder .

成员函数文档编制

[protected] QMediaRecorderControl:: QMediaRecorderControl ( QObject * parent = Q_NULLPTR)

Constructs a media recorder control with the given parent .

[虚拟] QMediaRecorderControl:: ~QMediaRecorderControl ()

Destroys a media recorder control.

[signal] void QMediaRecorderControl:: actualLocationChanged (const QUrl & location )

Signals that the actual media location has changed. This signal should be emitted at start of recording.

[pure virtual] void QMediaRecorderControl:: applySettings ()

Commits the encoder settings and performs pre-initialization to reduce delays when recording is started.

[pure virtual] qint64 QMediaRecorderControl:: duration () const

Return the current duration in milliseconds.

[signal] void QMediaRecorderControl:: durationChanged ( qint64 duration )

信号 duration of the recorded media has changed.

This only emitted when there is a discontinuous change in the duration such as being reset to 0.

[signal] void QMediaRecorderControl:: error ( int error , const QString & errorString )

Signals that an error has occurred. The errorString describes the error.

[pure virtual] bool QMediaRecorderControl:: isMuted () const

Returns true if the recorder is muted, and false if it is not.

[signal] void QMediaRecorderControl:: mutedChanged ( bool muted )

信号 muted state of a media recorder has changed.

[pure virtual] QUrl QMediaRecorderControl:: outputLocation () const

Returns the current output location being used.

另请参阅 setOutputLocation ().

[pure virtual slot] void QMediaRecorderControl:: setMuted ( bool muted )

设置 muted state of a media recorder.

另请参阅 isMuted ().

[pure virtual] bool QMediaRecorderControl:: setOutputLocation (const QUrl & location )

Sets the output location and returns if this operation is successful. If file at the output location already exists, it should be overwritten.

The location can be relative or empty; in this case the service should use the system specific place and file naming scheme.

After recording has started, the backend should report the actual file location with actualLocationChanged () 信号。

另请参阅 outputLocation ().

[pure virtual slot] void QMediaRecorderControl:: setState ( QMediaRecorder::State state )

Set the media recorder state .

另请参阅 state ().

[pure virtual slot] void QMediaRecorderControl:: setVolume ( qreal volume )

设置音频 volume of a media recorder control.

The volume is scaled linearly, ranging from 0 (无声) 到 100 (full volume).

另请参阅 volume ().

[pure virtual] QMediaRecorder::State QMediaRecorderControl:: state () const

Return the current recording state.

另请参阅 setState ().

[signal] void QMediaRecorderControl:: stateChanged ( QMediaRecorder::State state )

信号 state of a media recorder has changed.

[pure virtual] QMediaRecorder::Status QMediaRecorderControl:: status () const

Return the current recording status.

[signal] void QMediaRecorderControl:: statusChanged ( QMediaRecorder::Status status )

信号 status of a media recorder has changed.

[pure virtual] qreal QMediaRecorderControl:: volume () const

Returns the audio volume of a media recorder control.

另请参阅 setVolume ().

[signal] void QMediaRecorderControl:: volumeChanged ( qreal gain )

信号音频 gain value has changed.

宏文档编制

QMediaRecorderControl_iid

org.qt-project.qt.mediarecordercontrol/5.0

定义接口名为 QMediaRecorderControl 类。