requestNew method

Voice? requestNew(InstrumentRegion region, int channel)

Implementation

Voice? requestNew(InstrumentRegion region, int channel) {
  // If the voice is an exclusive class, reuse the existing one so that only one note
  // will be played at a time.
  int exclusiveClass = region.exclusiveClass();

  if (exclusiveClass != 0) {
    for (var i = 0; i < _activeVoiceCount; i++) {
      var voice = voices[i];

      if (voice.exclusiveClass() == exclusiveClass && voice.channel() == channel) {
        return voice;
      }
    }
  }

  if (_activeVoiceCount < voices.length) {
    var free = voices[_activeVoiceCount];
    _activeVoiceCount++;
    return free;
  }

  // Too many active voices...
  // Find one which has the lowest priority.
  Voice? low = null;
  var lowestPriority = double.maxFinite;
  for (int i = 0; i < _activeVoiceCount; i++) {
    var voice = voices[i];
    var priority = voice.priority();
    if (priority < lowestPriority) {
      lowestPriority = priority;
      low = voice;
    } else if (priority == lowestPriority) {
      // Same priority...
      // The older one should be more suitable for reuse.
      if (low == null || voice.voiceLength() > low.voiceLength()) {
        low = voice;
      }
    }
  }
  return low;
}