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 "selfdrive/ui/soundd/sound.h"
#include <cmath>
#include <QAudio>
#include <QAudioDeviceInfo>
#include <QDebug>
#include "cereal/messaging/messaging.h"
#include "common/util.h"
// TODO: detect when we can't play sounds
// TODO: detect when we can't display the UI
Sound::Sound(QObject *parent) : sm({"controlsState", "microphone"}) {
qInfo() << "default audio device: " << QAudioDeviceInfo::defaultOutputDevice().deviceName();
for (auto &[alert, fn, loops] : sound_list) {
QSoundEffect *s = new QSoundEffect(this);
QObject::connect(s, &QSoundEffect::statusChanged, [=]() {
assert(s->status() != QSoundEffect::Error);
});
s->setSource(QUrl::fromLocalFile("../../assets/sounds/" + fn));
sounds[alert] = {s, loops};
}
QTimer *timer = new QTimer(this);
QObject::connect(timer, &QTimer::timeout, this, &Sound::update);
timer->start(1000 / UI_FREQ);
}
void Sound::update() {
sm.update(0);
// scale volume using ambient noise level
if (sm.updated("microphone")) {
float volume = util::map_val(sm["microphone"].getMicrophone().getFilteredSoundPressureWeightedDb(), 30.f, 60.f, 0.f, 1.f);
volume = QAudio::convertVolume(volume, QAudio::LogarithmicVolumeScale, QAudio::LinearVolumeScale);
// set volume on changes
if (std::exchange(current_volume, std::nearbyint(volume * 10)) != current_volume) {
Hardware::set_volume(volume);
}
}
setAlert(Alert::get(sm, 0));
}
void Sound::setAlert(const Alert &alert) {
if (!current_alert.equal(alert)) {
current_alert = alert;
// stop sounds
for (auto &[s, loops] : sounds) {
// Only stop repeating sounds
if (s->loopsRemaining() > 1 || s->loopsRemaining() == QSoundEffect::Infinite) {
s->stop();
}
}
// play sound
if (alert.sound != AudibleAlert::NONE) {
auto &[s, loops] = sounds[alert.sound];
s->setLoopCount(loops);
s->play();
}
}
}