Playing sound with Qt and Phonon

In games generally we need to play small sound clips. For Qt program in such case I prefer to use Phonon module.

Following is simple sample code that plays sound clips on button click event.

In constructor I am creating media object and audio output. MediaObject class provides playback interface, AudioOutput send audio data to output device and by createPath method call we are creating connection of media object to audio output.

Then in playSound method I am setting sound file which needs to be played by calling setCurrentSource api and providing path of sound file. Finally by calling play API on media object i am playing sound file.

SoundWidget::SoundWidget(QWidget *parent) :
    QWidget(parent) 
{
    QVBoxLayout* main = new QVBoxLayout(this);
    QPushButton* btn = new QPushButton("Play Sound");
    connect(btn,SIGNAL(clicked()),this,SLOT(playSound()));
    main->addWidget(btn);

    mMediaObject = new Phonon::MediaObject(this);
    mAudioOutput = new Phonon::AudioOutput(Phonon::MusicCategory, this);
    mAudioOutput->setVolume(0.5);

    Phonon::createPath(mMediaObject, mAudioOutput);
}

void SoundWidget::playSound() 
{
    mMediaObject->setCurrentSource(QString("./Sound5.wav") );
    mMediaObject->play();
}

Following is header file for above code. You also need to add phonon module in Qt project file by putting "QT += phonon" in pro file.

#ifndef SOUNDWIDGET_H
#define SOUNDWIDGET_H

#include <QWidget>
#include <phonon/mediaobject.h>
#include <phonon/audiooutput.h>

class SoundWidget : public QWidget
{
    Q_OBJECT
public:
    explicit SoundWidget(QWidget *parent = 0);   

public slots:
    void playSound();

private:
    Phonon::MediaObject* mMediaObject;
    Phonon::AudioOutput* mAudioOutput;
};

#endif // SOUNDWIDGET_H