Problem in playing the audio back from Microphone to Speaker

M_31

Hi All,
I have used this example code to record my voice from Microphone .."audioInput example ":http://doc.qt.nokia.com/latest/multimedia-audioinput.html and added few more codes to play back the recorded voice from the buffer (QByteArray ) thru speaker.

my codes are ..

@

void InputTest::createAudioOutput()
{
QAudioDeviceInfo deviceInfo;
foreach( deviceInfo, QAudioDeviceInfo::availableDevices(QAudio::AudioOutput))
{
if( deviceInfo.deviceName().contains( "Realtek HD Audio output", Qt::CaseInsensitive ))
{
break;
}
}
qDebug() << "Current Devices"<<deviceInfo.deviceName();
if (!deviceInfo.isFormatSupported(m_format))
{
qWarning()<<"default format not supported try to use nearest";
m_format = deviceInfo.nearestFormat(m_format);
}

qDebug()<<"Start of createaudioOutput";

m_audioOutput = new QAudioOutput(deviceInfo, m_format, this);
connect(m_audioOutput, SIGNAL(notify()), SLOT(outputNotified()));
connect(m_audioOutput, SIGNAL(stateChanged(QAudio::State)), SLOT(stateChanged(QAudio::State)));

qDebug()<<"End  of createaudioOutput";

}

// in Constrcutor

tempBuff = new QBuffer( this );
tempBuff->open( QIODevice::ReadWrite );

// and i have overridded the existing readMore function

void InputTest::readMore()
{
if(!m_audioInput)
return;

qint64 len = m_audioInput->bytesReady();

if(len > 4096)
{
    m_buffer.resize( len );
    len = 4096;
}

qint64 l = m_input->read(m_buffer.data(), len);

tempBuff->setData( m_buffer );
tempBuff->close();
QIODevice *io =  m_audioOutput->start();
io->write( tempBuff->buffer() );

if(l > 0)
{
    qint64 nSize =  m_audioInfo->write(m_buffer.constData(), l);

    const char * data = m_buffer.constData();

    QByteArray tempByteArr =  m_buffer.toHex();
    textEdit->setText( QVariant( tempByteArr ).toString() );


}

}

@

But ..i am not getting any response in my speaker..
and i am always getting the State as 3 : "QAudio::UnderrunError 3 Audio data is not being fed to the audio device at a fast enough rate"

Please let me know whether i am doing anything wrong on this.