Hi, I was planning to write a small VOIP program using QUdpSockets, but this always ended in buffer underrun problems. I looked with Wireshark whether the receiving end was getting packets and it was.
To better understand the problem, I made the following ridiculous code that gets data from the QAudioInput component via the QIODevice "device" and gives this device to QAudioOutput that I expected to play the audio from the microphone. But it doesn't, the QAudioOutput still gives "buffer underrun" messages.

Anyone has an idea what i'm doing wrong?

Qt Code: 
  1. AudioController::AudioController()
  2. {
  3.     // Set up the format, eg.
  4.     format.setFrequency(10100);
  5.     format.setChannels(1);
  6.     format.setSampleSize(8);
  7.     format.setCodec("audio/pcm");
  8.     format.setByteOrder(QAudioFormat::LittleEndian);
  9.     format.setSampleType(QAudioFormat::UnSignedInt);
  10.  
  11.     QAudioDeviceInfo info(QAudioDeviceInfo::defaultOutputDevice());
  12.     if (!info.isFormatSupported(format)) {
  13.         qDebug("raw audio format not supported by backend, cannot play audio.");
  14.         return;
  15.     }
  16.  
  17.     input = new QAudioInput(format, this);
  18.     output = new QAudioOutput(format, this);
  19.  
  20.     connect(input,SIGNAL(stateChanged(QAudio::State)),SLOT(inputPlaying(QAudio::State)));
  21.     device = input->start();
  22.  
  23.     connect(output,SIGNAL(stateChanged(QAudio::State)),SLOT(outputPlaying(QAudio::State)));
  24.     output->start(device);
  25.  
  26. }
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