Method playback

source/game/StarSongbook.cpp:110–153

}

void Songbook::playback() {
  if (!active() || (m_track.empty() && m_heldNotes.empty())) {
    stop();
    return;
  }
  m_timeSourceInstance->keepalive = Time::millisecondsSinceEpoch();
  auto now = (Time::millisecondsSinceEpoch() - m_timeSourceInstance->epoch) / 1000.0;
  if (!m_heldNotes.empty()) {
    for (auto& note : m_heldNotes)
      note.audio->setPosition(m_position);
    eraseWhere(m_heldNotes, [&](HeldNote const& note) -> bool {
        return note.audio->finished();
      });
  }

  while (!m_track.empty() && (m_track.first().timecode <= (now + 0.5))) {
    auto note = m_track.takeFirst();
    auto delta = now - note.timecode;
    if (delta > 1)
      continue; // skip notes that are more than a second behind
    if (!m_uncompressedSamples.contains(note.file)) {
      auto sample = Root::singleton().assets()->audio(note.file);
      if (sample->compressed()) {
        auto copy = make_shared<Audio>(*sample);
        copy->uncompress();
        m_uncompressedSamples[note.file] = copy;
      } else
        m_uncompressedSamples[note.file] = sample;
    }

    AudioInstancePtr audioInstance = make_shared<AudioInstance>(*m_uncompressedSamples[note.file]);
    audioInstance->setMixerGroup(MixerGroup::Instruments);
    audioInstance->setPitchMultiplier(note.velocity);

    auto start = m_timeSourceInstance->epoch + (int64_t)(note.timecode * 1000.0);
    audioInstance->setClockStart(start);
    audioInstance->setClockStop(start + (int64_t)(note.duration * 1000.0), (int64_t)(note.fadeout * 1000.0));

    audioInstance->setPosition(m_position);

    m_pendingAudio.append(audioInstance);
    m_heldNotes.append(HeldNote{audioInstance, note.timecode, note.duration + note.timecode});
  }
}

void Songbook::render(RenderCallback* renderCallback) {
  for (auto& a : m_pendingAudio)