How to select the parameter of the setCodec() function for audio recording in Qt

Question

I'm using QAudioRecorder in Qt to record a voice, here is the sample code.

audioRecorder = new QAudioRecorder;

QAudioEncoderSettings audioSettings;
audioSettings.setCodec("audio/amr"); //here's my question
audioSettings.setQuality(QMultimedia::HighQuality);

audioRecorder->setEncodingSettings(audioSettings);

audioRecorder->setOutputLocation(QUrl::fromLocalFile("test.amr"));
audioRecorder->record();

But I have no idea how to use the setCodec() function

void QAudioEncoderSettings::setCodec(const QString & codec)

How can find out which parameter (such as "audio/amr" or "audio/x-wav") I can use and their exact meanings? Thanks!

Answer 1

You could see the codec candidate in the source code for the different plugins.

• GStreamer
  • audio/mpeg
  • audio/vorbis
  • audio/speex
  • audio/GSM
  • audio/PCM
  • audio/AMR
  • audio/AMR-WB
  • audio/FLAC
    
    
• AudioCapture
  • audio/pcm
    
    
• QNX
  • aac
  • raw

Answer 2

You can call supportedAudioCodecs in the QMediaRecorder class to get list of supported codecs.

MWE:

    QAudioRecorder *recorder = new QAudioRecorder(this);
    QStringList codecs_list = recorder->supportedAudioCodecs();

    for( int i=0 ; i<codecs_list.count() ; i++ )
    {
        qDebug() << codecs_list[i];
    }