Proper way playing oga files as sound effects

[VahagnI]

I am developing a GUI application under Ubuntu Linux with Qt5.
I want to use sounds from "/usr/share/sounds/freedesktop/" as sound effects, which contains .oga files. However, the QSoundEffect class seems to understand only .wav files. qDebug() << QSoundEffect::supportedMimeTypes(); outputs

("audio/x-wav", "audio/vnd.wave")

and the application prints QSoundEffect(pulseaudio): Error decoding source at initialization.
Is there a way to play these files?

I use the QSoundEffect as in the code snippet below. Is this the proper way to use the class?
Is using QMediaPlayer instead of QSoundEffect an overkill?

class MyClass: public QDialog {
public:
    MyClass(QObject * parent = nullptr): QDialog(parent) {

    QSoundEffect * ok = new QSoundEffect(this);
    ok->setSource("/path/to/file.oga");
    sound_effects_["ok"] = ok;
   /*Initialize other effects*/

    connect(this, &MyClass::PlaySound, this, &MyClass::Play);
}

void AFunctionFromADiffernetThread(){
     // Do other things
    if(success)
        emit PlaySound("ok");
}

signals:
    void PlaySound(const QString & name);

private slots:
  void Play(const QString & name){
    sound_effects_[name]->play();
 }
private:
    QMap<QString, QSoundEffect *> sound_effects_;
}

[SGaist]

Hi and welcome to devnet,

The details of QSoundEffect explain that only uncompressed formats are supported, typically wav files.