Audio Recording from microphone to wav file in Qt

sergex

Hello, I am trying to do an application with the purpose of being able to record phrases and have them automatically saved in a chosen directory as wav files. For this I am trying to use the QAudioRecorder class. When I hit the record button I speak something into the microphone and .wav file gets saved into the directory that I chose with the name that I want but when I playback the file it is just noise. I don't think I am using the recording class properly.

What I have so far is :

@
void RecordingWidget::startRecording()
{
if(audioRecorder->state() == QMediaRecorder::StoppedState)
{

    //Set Audio Input
    audioRecorder->setAudioInput(audioRecorder->defaultAudioInput());

    // Sets Output location where to store the file
    if(!m_outputLocationSet)
        setOutputLocation();

    // Set recording Settings
    QAudioEncoderSettings settings;
    settings.setCodec("audio/amr");     // Not sure what to put here
    settings.setSampleRate(16000);
    settings.setBitRate(32);
    settings.setQuality(QMultimedia::HighQuality);
    settings.setEncodingMode(QMultimedia::ConstantQualityEncoding);

    audioRecorder->setEncodingSettings(settings); 
    audioRecorder->record();
}

else {
    stopRecording();
}

}

@

Any guidance greatly appreciated! Thanks.

messi

Hi sergex.

Use "QAudioEncoderControl::supportedAudioCodecs":http://doc.qt.digia.com/qtmobility-1.2/qaudioencodercontrol.html first to find out which codec your system support.

One of this codec is responsible for wav.
Take this string an add with setCodec()

Also check QAudioEncoderControl::supportedEncodingOptions for this codec to be sure the everything is set correctly.