MidiMessageUtils.java

package org.herac.tuxguitar.io.midi;

import org.herac.tuxguitar.io.midi.base.MidiMessage;
import org.herac.tuxguitar.song.models.TGTimeSignature;

public class MidiMessageUtils {

  public static final byte TICK_MOVE = 0x01;

  public static MidiMessage controlChange(int channel, int controller, int value) {
    return MidiMessage.shortMessage(MidiMessage.CONTROL_CHANGE,
        fixChannel(channel), fixValue(controller), fixValue(value));
  }

  public static MidiMessage endOfTrack() {
    return MidiMessage.metaMessage(47, new byte[] {});
  }

  private static int fixChannel(int channel) {
    int fixedChannel = channel;
    fixedChannel = Math.min(fixedChannel, 15);
    fixedChannel = Math.max(fixedChannel, 0);
    return fixedChannel;
  }

  private static int fixValue(int value) {
    int fixedValue = value;
    fixedValue = Math.min(fixedValue, 127);
    fixedValue = Math.max(fixedValue, 0);
    return fixedValue;
  }

  public static MidiMessage noteOff(int channel, int note, int velocity) {
    return MidiMessage.shortMessage(MidiMessage.NOTE_OFF, fixChannel(channel),
        fixValue(note), fixValue(velocity));
  }

  public static MidiMessage noteOn(int channel, int note, int velocity) {
    return MidiMessage.shortMessage(MidiMessage.NOTE_ON, fixChannel(channel),
        fixValue(note), fixValue(velocity));
  }

  public static MidiMessage pitchBend(int channel, int value) {
    return MidiMessage.shortMessage(MidiMessage.PITCH_BEND,
        fixChannel(channel), 0, fixValue(value));
  }

  public static MidiMessage programChange(int channel, int instrument) {
    return MidiMessage.shortMessage(MidiMessage.PROGRAM_CHANGE,
        fixChannel(channel), fixValue(instrument));
  }

  public static MidiMessage systemReset() {
    return MidiMessage.shortMessage(MidiMessage.SYSTEM_RESET);
  }

  public static MidiMessage tempoInUSQ(int usq) {
    MidiMessage message = new MidiMessage(MidiMessage.TYPE_META,
        MidiMessage.TEMPO_CHANGE);
    message.setData(new byte[] { (byte) ((usq >> 16) & 0xff),
        (byte) ((usq >> 8) & 0xff), (byte) ((usq) & 0xff) });
    // message.setData(new byte[]{(byte)((usq >> 16) & 0x00FF),(byte)((usq >> 8)
    // & 0x00FF),(byte)((usq) & 0x00FF) });
    return message;
  }

  public static MidiMessage timeSignature(TGTimeSignature ts) {
    MidiMessage message = new MidiMessage(MidiMessage.TYPE_META,
        MidiMessage.TIME_SIGNATURE_CHANGE);
    message.setData(new byte[] { (byte) ts.getNumerator(),
        (byte) ts.getDenominator().getIndex(),
        (byte) (96 / ts.getDenominator().getValue()), 8 });
    return message;
  }
}