Sound Recorder in Qt

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C++

multimedia

QT

I want to build an application with an audio recorder function using Qt Mobility. In this application I have the following code in RecordSound.cpp file:

RecordSound::RecordSound(QWidget *parent)
{
...
        
     connect(ui.buttonStartRecording, SIGNAL(clicked()), this, SLOT(startRecording()));
...
}
void RecordSound::startRecording()
{
    ui.lineEdit->setEnabled(false);
    timer->start(1000);
    time->setHMS(0,0,0);
    QString text = time->toString("hh:mm:ss");
    ui.lcdNumber->display(text);
    connect(this->timer, SIGNAL(timeout()), this, SLOT(runTime()));
    if(fileName.length()!=0)
	fileName.append(".wav");
    else fileName="unknown.wav";
    file   = new QFile(fileName);
    file->open(QIODevice::WriteOnly | QIODevice::Truncate );
    capture = new QMediaRecorder(audiosource);
    QStringList devices=listDevice();
    audiosource->setAudioInput(devices[0]);
	QAudioEncoderSettings audioSettings;
    audioSettings.setCodec("audio/raw");
    audioSettings.setSampleRate(96000);
    audioSettings.setQuality(QtMultimediaKit::HighQuality);
    capture->setEncodingSettings(audioSettings);
    capture->setOutputLocation(fileName);
    audiosource->setNotifyInterval(1000);
}
...
void RecordSound::recordSound()
{
    capture->record();
}
...

What should I add or change in this file to record sounds from your sound card?