connect(this->audio_player,
        SIGNAL(positionChanged(qint64)),
        this,
        SLOT(audio_position_changed(qint64)));

typedef PosInAudio qint64;

connect(this->audio_player,
        SIGNAL(positionChanged(PosInAudio)),
        this,
        SLOT(audio_position_changed(PosInAudio)));

#define PosInAudio qint64

connect(this->audio_player,
        SIGNAL(positionChanged(PosInAudio)),
        this,
        SLOT(audio_position_changed(PosInAudio)));