MidiMessageUtils.java

package org.herac.tuxguitar.player.impl.jsa.utils;

import javax.sound.midi.InvalidMidiDataException;
import javax.sound.midi.MetaMessage;
import javax.sound.midi.MidiMessage;
import javax.sound.midi.ShortMessage;

import org.apache.log4j.Logger;
import org.herac.tuxguitar.song.models.TGTimeSignature;

public class MidiMessageUtils {
  /** The Logger for this class. */
  public static final transient Logger LOG = Logger
      .getLogger(MidiMessageUtils.class);
  
  public static final byte TICK_MOVE = 0x01;

  public static MidiMessage controlChange(int channel, int controller, int value) {
    try {
      ShortMessage message = new ShortMessage();
      message.setMessage(ShortMessage.CONTROL_CHANGE, fixChannel(channel),
          fixValue(controller), fixValue(value));
      return message;
    } catch (InvalidMidiDataException e) {
      LOG.error(e);
    }
    return null;
  }

  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) {
    try {
      ShortMessage message = new ShortMessage();
      message.setMessage(ShortMessage.NOTE_OFF, fixChannel(channel),
          fixValue(note), fixValue(velocity));
      return message;
    } catch (InvalidMidiDataException e) {
      LOG.error(e);
    }
    return null;
  }

  public static MidiMessage noteOn(int channel, int note, int velocity) {
    try {
      ShortMessage message = new ShortMessage();
      message.setMessage(ShortMessage.NOTE_ON, fixChannel(channel),
          fixValue(note), fixValue(velocity));
      return message;
    } catch (InvalidMidiDataException e) {
      LOG.error(e);
    }
    return null;
  }

  public static MidiMessage pitchBend(int channel, int value) {
    try {
      ShortMessage message = new ShortMessage();
      message.setMessage(ShortMessage.PITCH_BEND, fixChannel(channel), 0,
          fixValue(value));
      return message;
    } catch (InvalidMidiDataException e) {
      LOG.error(e);
    }
    return null;
  }

  public static MidiMessage programChange(int channel, int instrument) {
    try {
      ShortMessage message = new ShortMessage();
      message.setMessage(ShortMessage.PROGRAM_CHANGE, fixChannel(channel),
          fixValue(instrument), 0);
      return message;
    } catch (InvalidMidiDataException e) {
      LOG.error(e);
    }
    return null;
  }

  public static MidiMessage systemReset() {
    try {
      ShortMessage message = new ShortMessage();
      message.setMessage(ShortMessage.SYSTEM_RESET);
      return message;
    } catch (InvalidMidiDataException e) {
      LOG.error(e);
    }
    return null;
  }

  public static MidiMessage tempoInUSQ(int usq) {
    try {
      MetaMessage message = new MetaMessage();
      message.setMessage(0x51, new byte[] { (byte) ((usq >> 16) & 0x00FF),
          (byte) ((usq >> 8) & 0x00FF), (byte) ((usq) & 0x00FF) }, 3);
      return message;
    } catch (InvalidMidiDataException e) {
      LOG.error(e);
    }
    return null;
  }

  public static MidiMessage timeSignature(TGTimeSignature ts) {
    try {
      MetaMessage message = new MetaMessage();
      message.setMessage(0x58, new byte[] { (byte) ts.getNumerator(),
          (byte) ts.getDenominator().getIndex(),
          (byte) (96 / ts.getDenominator().getValue()), 8 }, 4);
      return message;
    } catch (InvalidMidiDataException e) {
      LOG.error(e);
    }
    return null;
  }
}