void StopNoteEvent::performEvent(MidiOutputDevice &device) const
{
#if defined(LOG_MIDI_EVENTS)
qDebug() << "Stop Note: " << mySystem << ", " << myPosition << " at " <<
myStartTime;
#endif
device.stopNote(myChannel, myPitch);
}
void MidiPlayer::performCountIn(MidiOutputDevice &device,
const SystemLocation &location,
int beat_duration)
{
// Load preferences.
uint8_t velocity;
uint8_t preset;
{
auto settings = mySettingsManager.getReadHandle();
if (!settings->get(Settings::CountInEnabled))
return;
velocity = settings->get(Settings::CountInVolume);
preset = settings->get(Settings::CountInPreset) +
Midi::MIDI_PERCUSSION_PRESET_OFFSET;
}
// Figure out the time signature where playback is starting.
const System &system = myScore.getSystems()[location.getSystem()];
const Barline *barline = system.getPreviousBarline(location.getPosition());
if (!barline)
barline = &system.getBarlines().front();
const TimeSignature &time_sig = barline->getTimeSignature();
const int tick_duration = boost::rational_cast<int>(
boost::rational<int>(4, time_sig.getBeatValue()) *
boost::rational<int>(time_sig.getBeatsPerMeasure(),
time_sig.getNumPulses()) * beat_duration);
// Play the count-in.
device.setChannelMaxVolume(METRONOME_CHANNEL,
Midi::MAX_MIDI_CHANNEL_VOLUME);
for (int i = 0; i < time_sig.getNumPulses(); ++i)
{
if (!isPlaying())
break;
device.playNote(METRONOME_CHANNEL, preset, velocity);
usleep(tick_duration * (100.0 / myPlaybackSpeed));
device.stopNote(METRONOME_CHANNEL, preset);
}
}