Using Qt 5.5.1 on a Windows 7 desktop and a laptop.

I have tried the following program with mp3, wav, flac files. I can only hear the buzzing sound, nothing else. Please guide.

The reproducable example:

Qt Code: 
  1. #include <QCoreApplication>
  2. #include <QAudioOutput>
  3. #include <QFile>
  4. #include <QDebug>
  5.  
  6. int main(int argc, char *argv[])
  7. {
  8.     QCoreApplication a(argc, argv);
  9.  
  10.     QAudioOutput* audioOutpu;
  11.  
  12.     QFile sourceFile;
  13.     sourceFile.setFileName("c.wav");
  14.     bool p = sourceFile.open(QIODevice::ReadOnly);
  15.     if (p == false)
  16.         qDebug() << "no file";
  17.     else
  18.         qDebug() << "yes file";
  19.  
  20.  
  21.     QAudioDeviceInfo d1;
  22.     QList<QAudioDeviceInfo> l1 = d1.availableDevices(QAudio::AudioOutput);
  23.  
  24.     qDebug() << "======================================================";
  25.     qDebug() << l1.first().supportedCodecs();
  26.     qDebug() << l1.first().supportedChannelCounts();
  27.     qDebug() << l1.first().supportedSampleTypes();
  28.     qDebug() << l1.first().supportedSampleRates();
  29.     qDebug() << l1.first().supportedSampleSizes();
  30.  
  31.     QAudioFormat desiredFormat1;
  32.     desiredFormat1.setChannelCount(2);
  33.     desiredFormat1.setByteOrder(QAudioFormat::LittleEndian);
  34.     desiredFormat1.setCodec("audio/pcm");
  35.     desiredFormat1.setSampleType(QAudioFormat::SignedInt);
  36.     desiredFormat1.setSampleRate(44100);
  37.     desiredFormat1.setSampleSize(16);
  38.  
  39.     QAudioDeviceInfo info1(QAudioDeviceInfo::defaultOutputDevice());
  40.     if (!info1.isFormatSupported(desiredFormat1))
  41.     {
  42.            qWarning() << "Default format not supported, trying to use the nearest.";
  43.            desiredFormat1 = info1.preferredFormat();
  44.     }
  45.  
  46.     audioOutpu = new QAudioOutput(desiredFormat1);
  47.     audioOutpu->setVolume(1.0);
  48.  
  49.     audioOutpu->start(&sourceFile);
  50.     qDebug() << "bbbbbbbbbb";
  51.     QEventLoop loop;
  52.     QObject::connect(audioOutpu, SIGNAL(stateChanged(QAudio::State)), &loop, SLOT(quit()));
  53.     do {
  54.         loop.exec();
  55.     } while(audioOutpu->state() == QAudio::ActiveState);
  56.  
  57.     return a.exec();
  58. }
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Output:
Screenshot from 2016-08-16 13:10:31.png