QAudioFormat

The QAudioFormat class stores audio stream parameter information. More…

Synopsis

Functions

• def __eq__ (b)

• def __ne__ (b)

• def bytesForDuration (microseconds)

• def bytesForFrames (frameCount)

• def bytesPerFrame ()

• def bytesPerSample ()

• def channelConfig ()

• def channelCount ()

• def channelOffset (channel)

• def durationForBytes (byteCount)

• def durationForFrames (frameCount)

• def framesForBytes (byteCount)

• def framesForDuration (microseconds)

• def isValid ()

• def normalizedSampleValue (sample)

• def sampleFormat ()

• def sampleRate ()

• def setChannelConfig (config)

• def setChannelCount (channelCount)

• def setSampleFormat (f)

• def setSampleRate (sampleRate)

Detailed Description

An audio format specifies how data in a raw audio stream is arranged. For example, how the stream is to be interpreted.

QAudioFormat contains parameters that specify how the audio sample data is arranged. These are the frequency, the number of channels, and the sample format. The following table describes these in more detail.

Parameter	Description
Sample Rate	Samples per second of audio data in Hertz.
Number of channels	The number of audio channels (typically one for mono or two for stereo). These are the amount of consecutive samples that together form one frame in the stream
Sample format	The format of the audio samples in the stream

This class is used in conjunction with QAudioSource or QAudioSink to allow you to specify the parameters of the audio stream being read or written, or with QAudioBuffer when dealing with samples in memory.

You can obtain audio formats compatible with the audio device used through functions in QAudioDevice . This class also lets you query available parameter values for a device, so that you can set the parameters yourself. See the QAudioDevice class description for details. You need to know the format of the audio streams you wish to play or record.

Samples for all channels will be interleaved. One sample for each channel for the same instant in time is referred to as a frame in Qt Multimedia (and other places).

class PySide6.QtMultimedia.QAudioFormat

PySide6.QtMultimedia.QAudioFormat(QAudioFormat)

Parameters

QAudioFormat – PySide6.QtMultimedia.QAudioFormat

PySide6.QtMultimedia.QAudioFormat.SampleFormat

Qt will always expect and use samples in the endianness of the host platform. When processing audio data from external sources yourself, ensure you convert them to the correct endianness before writing them to a QAudioSink or QAudioBuffer .

Constant	Description
QAudioFormat.Unknown	Not Set
QAudioFormat.UInt8	Samples are unsigned 8 bit signed integers
QAudioFormat.Int16	Samples are 16 bit signed integers
QAudioFormat.Int32	Samples are 32 bit signed integers
QAudioFormat.Float	Samples are floats

New in version 6.1.

PySide6.QtMultimedia.QAudioFormat.AudioChannelPosition

Describes the possible audio channel positions. These follow the standard definition used in the 22.2 surround sound configuration.

Constant	Description
QAudioFormat.UnknownPosition	Unknown position
QAudioFormat.FrontLeft
QAudioFormat.FrontRight
QAudioFormat.FrontCenter
QAudioFormat.LFE	Low Frequency Effect channel (Subwoofer)
QAudioFormat.BackLeft
QAudioFormat.BackRight
QAudioFormat.FrontLeftOfCenter
QAudioFormat.FrontRightOfCenter
QAudioFormat.BackCenter
QAudioFormat.LFE2
QAudioFormat.SideLeft
QAudioFormat.SideRight
QAudioFormat.TopFrontLeft
QAudioFormat.TopFrontRight
QAudioFormat.TopFrontCenter
QAudioFormat.TopCenter
QAudioFormat.TopBackLeft
QAudioFormat.TopBackRight
QAudioFormat.TopSideLeft
QAudioFormat.TopSideRight
QAudioFormat.TopBackCenter
QAudioFormat.BottomFrontCenter
QAudioFormat.BottomFrontLeft
QAudioFormat.BottomFrontRight

New in version 6.2.

PySide6.QtMultimedia.QAudioFormat.ChannelConfig

This enum describes a standardized audio channel layout. The most common configurations are Mono, Stereo, 2.1 (stereo plus low frequency), 5.1 surround, and 7.1 surround configurations.

Constant	Description
QAudioFormat.ChannelConfigUnknown	The channel configuration is not known.
QAudioFormat.ChannelConfigMono	The audio has one Center channel
QAudioFormat.ChannelConfigStereo	The audio has two channels, Left and Right
QAudioFormat.ChannelConfig2Dot1	The audio has three channels, Left, Right and LFE (low frequency effect)
QAudioFormat.ChannelConfigSurround5Dot0	The audio has five channels, Left, Right, Center, BackLeft , BackRight
QAudioFormat.ChannelConfigSurround5Dot1	The audio has 6 channels, Left, Right, Center, LFE, BackLeft and BackRight
QAudioFormat.ChannelConfigSurround7Dot0	The audio has 7 channels, Left, Right, Center, BackLeft , BackRight , SideLeft and SideRight
QAudioFormat.ChannelConfigSurround7Dot1	The audio has 8 channels, Left, Right, Center, LFE, BackLeft , BackRight , SideLeft and SideRight

PySide6.QtMultimedia.QAudioFormat.bytesForDuration(microseconds)

Parameters

microseconds – int

Return type

qint32

Returns the number of bytes required for this audio format for microseconds.

Returns 0 if this format is not valid.

Note that some rounding may occur if microseconds is not an exact fraction of the sampleRate() .

See also

durationForBytes()

PySide6.QtMultimedia.QAudioFormat.bytesForFrames(frameCount)

Parameters

frameCount – qint32

Return type

qint32

Returns the number of bytes required for frameCount frames of this format.

Returns 0 if this format is not valid.

See also

bytesForDuration()

PySide6.QtMultimedia.QAudioFormat.bytesPerFrame()

Return type

int

Returns the number of bytes required to represent one frame (a sample in each channel) in this format.

Returns 0 if this format is invalid.

PySide6.QtMultimedia.QAudioFormat.bytesPerSample()

Return type

int

Returns the number of bytes required to represent one sample in this format.

Returns 0 if this format is invalid.

PySide6.QtMultimedia.QAudioFormat.channelConfig()

Return type

ChannelConfig

Returns the current channel configuration.

PySide6.QtMultimedia.QAudioFormat.channelCount()

Return type

int

Returns the current channel count value.

See also

setChannelCount()

PySide6.QtMultimedia.QAudioFormat.channelOffset(channel)

Parameters

channel – AudioChannelPosition

Return type

int

Returns the position of a certain audio channel inside an audio frame for the given format. Returns -1 if the channel does not exist for this format or the channel configuration is unknown.

PySide6.QtMultimedia.QAudioFormat.durationForBytes(byteCount)

Parameters

byteCount – qint32

Return type

int

Returns the number of microseconds represented by bytes in this format.

Returns 0 if this format is not valid.

Note that some rounding may occur if bytes is not an exact multiple of the number of bytes per frame.

See also

bytesForDuration()

PySide6.QtMultimedia.QAudioFormat.durationForFrames(frameCount)

Parameters

frameCount – qint32

Return type

int

Return the number of microseconds represented by frameCount frames in this format.

PySide6.QtMultimedia.QAudioFormat.framesForBytes(byteCount)

Parameters

byteCount – qint32

Return type

qint32

Returns the number of frames represented by byteCount in this format.

Note that some rounding may occur if byteCount is not an exact multiple of the number of bytes per frame.

Each frame has one sample per channel.

See also

framesForDuration()

PySide6.QtMultimedia.QAudioFormat.framesForDuration(microseconds)

Parameters

microseconds – int

Return type

qint32

Returns the number of frames required to represent microseconds in this format.

Note that some rounding may occur if microseconds is not an exact fraction of the sampleRate() .

PySide6.QtMultimedia.QAudioFormat.isValid()

Return type

bool

Returns true if all of the parameters are valid.

PySide6.QtMultimedia.QAudioFormat.normalizedSampleValue(sample)

Parameters

sample – void

Return type

float

Normalizes the sample value to a number between -1 and 1. The method depends on the QaudioFormat.

PySide6.QtMultimedia.QAudioFormat.__ne__(b)

Parameters

b – PySide6.QtMultimedia.QAudioFormat

Return type

bool

PySide6.QtMultimedia.QAudioFormat.__eq__(b)

Parameters

b – PySide6.QtMultimedia.QAudioFormat

Return type

bool

PySide6.QtMultimedia.QAudioFormat.sampleFormat()

Return type

SampleFormat

Returns the current sample format.

See also

setSampleFormat()

PySide6.QtMultimedia.QAudioFormat.sampleRate()

Return type

int

Returns the current sample rate in Hertz.

See also

setSampleRate()

PySide6.QtMultimedia.QAudioFormat.setChannelConfig(config)

Parameters

config – ChannelConfig

Sets the channel configuration to config.

Sets the channel configuration of the audio format to one of the standard audio channel configurations.

Note

that this will also modify the channel count.

See also

channelConfig()

PySide6.QtMultimedia.QAudioFormat.setChannelCount(channelCount)

Parameters

channelCount – int

Sets the channel count to channels. Setting this also sets the channel config to ChannelConfigUnknown .

See also

channelCount()

PySide6.QtMultimedia.QAudioFormat.setSampleFormat(f)

Parameters

f – SampleFormat

Sets the sample format to format.

See also

sampleFormat() SampleFormat

PySide6.QtMultimedia.QAudioFormat.setSampleRate(sampleRate)

Parameters

sampleRate – int

Sets the sample rate to samplerate in Hertz.

See also

sampleRate()