AudioSource Class Reference

opposite of audiosink. More...

#include <audiosource.h>

Inheritance diagram for AudioSource:

Collaboration diagram for AudioSource:

Public Slots
void	processCapturedAudio ()
void	inputStatusChanged (QAudio::State aState)

Signals
void	frameCaptured (const QByteArray &aFrame, quint32 aSeqNo, float aVolumeLevel)
void	audioMaxLevel (float aMaxVolume)

Public Member Functions
	AudioSource (Model &aModel)
	~AudioSource ()
quint32	getCurrentSeqNo () const
void	stopCapturing ()

Protected Member Functions
virtual qint64	writeData (const char *data, qint64 maxSize)
virtual qint64	readData (char *data, qint64 maxSize)
virtual bool	open (OpenMode mode)
virtual bool	isSequential () const
void	timerEvent (QTimerEvent *event)

Private Attributes
QAudioFormat	iFormat
QAudioInput *	iAudioInput
QByteArray	iAudioBuffer
quint32	iSeqNo
bool	iNeedsToRun
Model &	iModel
int	iTimerId

Detailed Description

opposite of audiosink.

Class for capturing audio. This class provides 16-bit PCM digital audio in 8kHz sample rate in pieces of 480 samples, each exactly 60ms long. Output format is in floating point numbers in range [0,1].

Constructor & Destructor Documentation

AudioSource()

AudioSource::AudioSource

(

Model &

aModel

)

Constructor.

~AudioSource()

AudioSource::~AudioSource

(

)

Member Function Documentation

audioMaxLevel

void AudioSource::audioMaxLevel ( float  aMaxVolume )

signal

This is actually average audio volume, in range [0,1]

frameCaptured

void AudioSource::frameCaptured ( const QByteArray &  aFrame, quint32  aSeqNo, float  aVolumeLevel  )

signal

Emitted when complete audio frame is ready to be processed

Parameters

aFrame	is the audio data. Content of the byte array is floats in range [-1,1]
aSeqNo	sequence number of the captured frame, it will sequentially increase as time passes
aVolumeLevel	calculated average volume level of frame ; will be used by audio mixer

getCurrentSeqNo()

quint32 AudioSource::getCurrentSeqNo ( ) const

inline

getter-method for next sequence number

inputStatusChanged

void AudioSource::inputStatusChanged ( QAudio::State  aState )

slot

Input status changed

isSequential()

virtual bool AudioSource::isSequential ( ) const

inlineprotectedvirtual

open()

virtual bool AudioSource::open ( OpenMode  mode )

protectedvirtual

method for opening QIODevice: sets the open mode that's about it.

processCapturedAudio

void AudioSource::processCapturedAudio ( )

slot

Method called by timer every now and then that does processing of captured data

readData()

virtual qint64 AudioSource::readData ( char *  data, qint64  maxSize  )

protectedvirtual

From QIODevice: in current implementation this method does nothing, audio is processed internally and this QIODevice implementation does not allow reading.

Returns

0 always

stopCapturing()

void AudioSource::stopCapturing

(

)

method for stopping capture

timerEvent()

void AudioSource::timerEvent ( QTimerEvent *  event )

protected

From QObject. Used for forwarding audio from buffer.

writeData()

virtual qint64 AudioSource::writeData ( const char *  data, qint64  maxSize  )

protectedvirtual

From QIODevice: method where audio data will be written from actual audio source: this class AudioSource inherits QIODevice and will offer itself as data sink of iAudioInput

Parameters

data	audio data
maxSize	max data size to be written

Returns

number of bytes actually written

Member Data Documentation

iAudioBuffer

QByteArray AudioSource::iAudioBuffer

private

iAudioInput

QAudioInput* AudioSource::iAudioInput

private

iFormat

QAudioFormat AudioSource::iFormat

private

iModel

Model& AudioSource::iModel

private

iNeedsToRun

bool AudioSource::iNeedsToRun

private

iSeqNo

quint32 AudioSource::iSeqNo

private

iTimerId

int AudioSource::iTimerId

private

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The documentation for this class was generated from the following file:

• audiosource.h