QAudioEncoderSettings Class

The QAudioEncoderSettings class provides a set of audio encoder settings. 更多...

头：	#include <QAudioEncoderSettings>
qmake:	QT += multimedia

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公共函数

	QAudioEncoderSettings (const QAudioEncoderSettings & other )
	QAudioEncoderSettings ()
QAudioEncoderSettings &	operator= (const QAudioEncoderSettings & other )
	~QAudioEncoderSettings ()
int	bitRate () const
int	channelCount () const
QString	codec () const
QMultimedia::EncodingMode	encodingMode () const
QVariant	encodingOption (const QString & option ) const
QVariantMap	encodingOptions () const
bool	isNull () const
QMultimedia::EncodingQuality	quality () const
int	sampleRate () const
void	setBitRate (int rate )
void	setChannelCount (int channels )
void	setCodec (const QString & codec )
void	setEncodingMode (QMultimedia::EncodingMode mode )
void	setEncodingOption (const QString & option , const QVariant & value )
void	setEncodingOptions (const QVariantMap & options )
void	setQuality (QMultimedia::EncodingQuality quality )
void	setSampleRate (int rate )
bool	operator!= (const QAudioEncoderSettings & other ) const
bool	operator== (const QAudioEncoderSettings & other ) const

详细描述

A audio encoder settings object is used to specify the audio encoder settings used by QMediaRecorder . Audio encoder settings are selected by constructing a QAudioEncoderSettings object, setting the desired properties and then passing it to a QMediaRecorder instance using the QMediaRecorder::setEncodingSettings () 函数。

QAudioEncoderSettings audioSettings;
audioSettings.setCodec("audio/mpeg");
audioSettings.setChannelCount(2);
recorder->setAudioSettings(audioSettings);

另请参阅 QMediaRecorder and QAudioEncoderSettingsControl .

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QAudioEncoderSettings:: QAudioEncoderSettings (const QAudioEncoderSettings & other )

Constructs a copy of the audio encoder settings object other .

QAudioEncoderSettings:: QAudioEncoderSettings ()

Construct a null audio encoder settings object.

QAudioEncoderSettings &QAudioEncoderSettings:: operator= (const QAudioEncoderSettings & other )

Assigns the value of other to an audio encoder settings object.

QAudioEncoderSettings:: ~QAudioEncoderSettings ()

Destroys an audio encoder settings object.

int QAudioEncoderSettings:: bitRate () const

Returns the bit rate of the compressed audio stream in bits per second.

另请参阅 setBitRate ().

int QAudioEncoderSettings:: channelCount () const

Returns the number of audio channels.

另请参阅 setChannelCount ().

QString QAudioEncoderSettings:: codec () const

Returns the audio codec.

另请参阅 setCodec ().

QMultimedia::EncodingMode QAudioEncoderSettings:: encodingMode () const

Returns the audio encoding mode.

另请参阅 setEncodingMode () 和 QMultimedia::EncodingMode .

QVariant QAudioEncoderSettings:: encodingOption (const QString & option ) const

返回值为编码 option .

另请参阅 setEncodingOption () 和 encodingOptions ().

QVariantMap QAudioEncoderSettings:: encodingOptions () const

返回所有编码选项按 QVariantMap .

另请参阅 encodingOption () 和 setEncodingOptions ().

bool QAudioEncoderSettings:: isNull () const

Identifies if an audio settings object is initialized.

Returns true if the settings object is null, and false if it is not.

QMultimedia::EncodingQuality QAudioEncoderSettings:: quality () const

Returns the audio encoding quality.

另请参阅 setQuality ().

int QAudioEncoderSettings:: sampleRate () const

Returns the audio sample rate in Hz.

另请参阅 setSampleRate ().

void QAudioEncoderSettings:: setBitRate ( int rate )

Sets the audio bit rate 以位每秒为单位。

另请参阅 bitRate ().

void QAudioEncoderSettings:: setChannelCount ( int channels )

Sets the number of audio channels .

A value of -1 indicates the encoder should make an optimal choice based on what is available from the audio source and the limitations of the codec.

另请参阅 channelCount ().

void QAudioEncoderSettings:: setCodec (const QString & codec )

设置音频 codec .

另请参阅 codec ().

void QAudioEncoderSettings:: setEncodingMode ( QMultimedia::EncodingMode mode )

Sets the audio encoding mode 设置。

若 QMultimedia::ConstantQualityEncoding is set, the quality encoding parameter is used and bit rate is ignored, otherwise the bitrate is used.

The audio codec, channels count and sample rate settings are used in all the encoding modes.

另请参阅 encodingMode () 和 QMultimedia::EncodingMode .

void QAudioEncoderSettings:: setEncodingOption (const QString & option , const QVariant & value )

设置编码 option to value .

The supported set and meaning of encoding options are system and selected codec specific.

另请参阅 encodingOption () 和 setEncodingOptions ().

void QAudioEncoderSettings:: setEncodingOptions (const QVariantMap & options )

Replace all the encoding options with options .

The supported set and meaning of encoding options are system and selected codec specific.

另请参阅 encodingOptions (), encodingOption ()，和 setEncodingOption ().

void QAudioEncoderSettings:: setQuality ( QMultimedia::EncodingQuality quality )

Set the audio encoding quality .

Setting the audio quality parameter allows backend to choose the balanced set of encoding parameters to achieve the desired quality level.

The quality settings parameter is only used in the constant quality encoding mode .

另请参阅 quality ().

void QAudioEncoderSettings:: setSampleRate ( int rate )

Sets the audio sample rate (以 Hz 为单位)。

A value of -1 indicates the encoder should make an optimal choice based on what is avaialbe from the audio source and the limitations of the codec.

另请参阅 sampleRate ().

bool QAudioEncoderSettings:: operator!= (const QAudioEncoderSettings & other ) const

Determines if other is of equal value to an audio encoder settings object.

Returns true if the settings objects are not of equal value, and true if they are of equal value.

bool QAudioEncoderSettings:: operator== (const QAudioEncoderSettings & other ) const

Determines if other is of equal value to an audio encoder settings object.

Returns true if the settings objects are of equal value, and false if they are not of equal value.