MidiEventPlayer.java

package org.herac.tuxguitar.player.impl.sequencer;

import java.util.ArrayList;
import java.util.List;

import org.herac.tuxguitar.player.base.MidiPlayerException;

public class MidiEventPlayer {
  private List<MidiEvent> events;
  private long lastTick;

  private boolean reset;
  private MidiSequencerImpl sequencer;
  private long tick;

  public MidiEventPlayer(MidiSequencerImpl sequencer) {
    this.sequencer = sequencer;
    this.events = new ArrayList<MidiEvent>();
    this.reset();
  }

  public void addEvent(MidiEvent event) {
    this.events.add(event);
  }

  public void clearEvents() {
    this.events.clear();
  }

  public void process() throws MidiPlayerException {
    this.lastTick = this.tick;
    this.tick = this.sequencer.getTickPosition();
    for (int i = 0; i < this.events.size(); i++) {
      MidiEvent event = (MidiEvent) this.events.get(i);
      if (shouldSend(event, this.tick, this.lastTick)) {
        this.sequencer.sendEvent(event);
      }
    }
    this.reset = false;
  }

  public void reset() {
    this.tick = (this.sequencer.getTickPosition() - 1);
    this.reset = true;
  }

  private boolean shouldSend(MidiEvent event, long tick, long lastTick) {
    if (event.getTick() > tick) {
      return false;
    }
    if (event.getTrack() != MidiEvent.ALL_TRACKS) {
      if (this.sequencer.getMidiTrackController().isMute(event.getTrack())) {
        return false;
      }
      if (this.sequencer.getMidiTrackController().isAnySolo()
          && !this.sequencer.getMidiTrackController().isSolo(event.getTrack())) {
        return false;
      }
    }
    if (this.reset) {
      if (event.getType() == MidiEvent.MIDI_SYSTEM_EVENT) {
        return true;
      }
      if (event.getType() == MidiEvent.MIDI_EVENT_CONTROL_CHANGE) {
        return true;
      }
      if (event.getType() == MidiEvent.MIDI_EVENT_PROGRAM_CHANGE) {
        return true;
      }
    }
    return (event.getTick() > lastTick);
  }

}