openpilot is an open source driver assistance system. openpilot performs the functions of Automated Lane Centering and Adaptive Cruise Control for over 200 supported car makes and models.

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#include <QApplication>
#include <QSoundEffect>
#include <QTimer>
#include <QDebug>
int main(int argc, char **argv) {
QApplication a(argc, argv);
QTimer::singleShot(0, [=]{
QSoundEffect s;
const char *vol = getenv("VOLUME");
s.setVolume(vol ? atof(vol) : 1.0);
for (int i = 1; i < argc; i++) {
QString fn = argv[i];
qDebug() << "playing" << fn;
QEventLoop loop;
s.setSource(QUrl::fromLocalFile(fn));
QEventLoop::connect(&s, &QSoundEffect::loadedChanged, &loop, &QEventLoop::quit);
loop.exec();
s.play();
QEventLoop::connect(&s, &QSoundEffect::playingChanged, &loop, &QEventLoop::quit);
loop.exec();
}
QCoreApplication::exit();
});
return a.exec();
}