内容

• 公共函数
• 信号
• 详细描述

QAbstractAudioOutput Class

QAbstractAudioOutput class is a base class for audio backends. 更多...

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

• 所有成员列表，包括继承成员

公共函数

virtual int	bufferSize () const = 0
virtual int	bytesFree () const = 0
virtual QString	category () const
virtual qint64	elapsedUSecs () const = 0
virtual QAudio::Error	error () const = 0
virtual QAudioFormat	format () const = 0
virtual int	notifyInterval () const = 0
virtual int	periodSize () const = 0
virtual qint64	processedUSecs () const = 0
virtual void	reset () = 0
virtual void	resume () = 0
virtual void	setBufferSize (int value ) = 0
virtual void	setCategory ( const QString & )
virtual void	setFormat (const QAudioFormat & fmt ) = 0
virtual void	setNotifyInterval (int ms ) = 0
virtual void	setVolume (qreal volume )
virtual void	start (QIODevice * device ) = 0
virtual QIODevice *	start () = 0
virtual QAudio::State	state () const = 0
virtual void	stop () = 0
virtual void	suspend () = 0
virtual qreal	volume () const

• 32 公共函数继承自 QObject

信号

void	errorChanged (QAudio::Error error )
void	notify ()
void	stateChanged (QAudio::State state )

• 2 信号继承自 QObject

额外继承成员

• 1 特性继承自 QObject
• 1 公共槽继承自 QObject
• 11 静态公共成员继承自 QObject
• 9 保护函数继承自 QObject

详细描述

QAbstractAudioOutput class is a base class for audio backends.

QAbstractAudioOutput implements audio functionality for QAudioOutput ，即： QAudioOutput routes function calls to QAbstractAudioOutput . For a description of the functionality that is implemented, see the QAudioOutput class and function descriptions.

另请参阅 QAudioOutput .

成员函数文档编制

[pure virtual] int QAbstractAudioOutput:: bufferSize () const

Returns the audio buffer size in bytes.

另请参阅 setBufferSize ().

[pure virtual] int QAbstractAudioOutput:: bytesFree () const

Returns the free space available in bytes in the audio buffer.

[virtual] QString QAbstractAudioOutput:: category () const

另请参阅 setCategory ().

[pure virtual] qint64 QAbstractAudioOutput:: elapsedUSecs () const

Returns the milliseconds since start () was called, including time in Idle and suspend states.

[pure virtual] QAudio::Error QAbstractAudioOutput:: error () const

返回错误状态。

[signal] void QAbstractAudioOutput:: errorChanged ( QAudio::Error error )

此信号被发射当 error state has changed.

[pure virtual] QAudioFormat QAbstractAudioOutput:: format () const

返回 QAudioFormat 被使用。

另请参阅 setFormat ().

[signal] void QAbstractAudioOutput:: notify ()

This signal is emitted when x ms of audio data has been processed the interval set by setNotifyInterval (x).

[pure virtual] int QAbstractAudioOutput:: notifyInterval () const

Returns the notify interval in milliseconds.

另请参阅 setNotifyInterval ().

[pure virtual] int QAbstractAudioOutput:: periodSize () const

Returns the period size in bytes.

[pure virtual] qint64 QAbstractAudioOutput:: processedUSecs () const

Returns the amount of audio data processed since start () was called in milliseconds.

[pure virtual] void QAbstractAudioOutput:: reset ()

Drops all audio data in the buffers, resets buffers to zero.

[pure virtual] void QAbstractAudioOutput:: resume ()

Resumes processing audio data after a suspend ()

[pure virtual] void QAbstractAudioOutput:: setBufferSize ( int value )

Sets the audio buffer size to value in bytes.

另请参阅 bufferSize ().

[virtual] void QAbstractAudioOutput:: setCategory ( const QString & )

另请参阅 category ().

[pure virtual] void QAbstractAudioOutput:: setFormat (const QAudioFormat & fmt )

设置 QAudioFormat to use to fmt . Setting the format is only allowable while in QAudio::StoppedState .

另请参阅 format ().

[pure virtual] void QAbstractAudioOutput:: setNotifyInterval ( int ms )

Sets the interval for notify () signal to be emitted. This is based on the ms of audio data processed not on actual real-time. The resolution of the timer is platform specific.

另请参阅 notifyInterval ().

[virtual] void QAbstractAudioOutput:: setVolume ( qreal volume )

Sets the volume. Where volume is between 0.0 and 1.0.

另请参阅 volume ().

[pure virtual] void QAbstractAudioOutput:: start ( QIODevice * device )

使用 device 作为 QIODevice to transfer data.

[pure virtual] QIODevice *QAbstractAudioOutput:: start ()

返回指针指向 QIODevice being used to handle the data transfer. This QIODevice can be used to write() audio data directly.

[pure virtual] QAudio::State QAbstractAudioOutput:: state () const

返回音频处理的状态。

[signal] void QAbstractAudioOutput:: stateChanged ( QAudio::State state )

此信号被发射当设备 state 已改变。

[pure virtual] void QAbstractAudioOutput:: stop ()

Stops the audio output.

[pure virtual] void QAbstractAudioOutput:: suspend ()

Stops processing audio data, preserving buffered audio data.

[virtual] qreal QAbstractAudioOutput:: volume () const

Returns the volume in the range 0.0 and 1.0.

另请参阅 setVolume ().