JackEventController.java

package org.herac.tuxguitar.jack.sequencer;

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

import org.herac.tuxguitar.player.base.MidiPlayerException;
import org.herac.tuxguitar.song.models.TGDuration;

public class JackEventController {
  private List<JackEvent> events;
  private double lastTick;

  private boolean reset;
  private JackSequencer sequencer;
  private double tick;

  public JackEventController(JackSequencer sequencer) {
    this.sequencer = sequencer;
    this.events = new ArrayList<JackEvent>();
    this.reset();
  }

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

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

  public List<JackEvent> getEvents() {
    return this.events;
  }

  public List<long[]> getTempoChanges() {
    List<long[]> tempoChanges = new ArrayList<long[]>();
    for (int i = 0; i < this.events.size(); i++) {
      JackEvent event = (JackEvent) this.events.get(i);
      if (event.getType() == JackEvent.MIDI_SYSTEM_EVENT) {
        if (event.getData()[0] == 0x51) {
          int usq = ((event.getData()[1] & 0xff)
              | ((event.getData()[2] & 0xff) << 8) | ((event.getData()[3] & 0xff) << 16));
          long[] tempoChange = new long[2];
          tempoChange[0] = event.getTick();
          tempoChange[1] = ((long) ((60.00 * 1000.00) / (usq / 1000.00)));
          tempoChanges.add(tempoChange);
        }
      }
    }
    return tempoChanges;
  }

  public void process() throws MidiPlayerException {
    this.lastTick = this.tick;
    this.tick = this.sequencer.getJackTickController().getTick();
    for (int i = 0; i < this.events.size(); i++) {
      JackEvent event = (JackEvent) 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() - (TGDuration.QUARTER_TIME / 8));
    this.reset = true;
  }

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