Take the NOTE_ON event note On (which is event i in track), and find the matching NOTE_OFF event for MIDI. - Java javax.sound.midi

Java examples for javax.sound.midi:MidiEvent

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Description

Take the NOTE_ON event note On (which is event i in track), and find the matching NOTE_OFF event for MIDI.

Demo Code


import javax.sound.midi.ShortMessage;
import javax.sound.midi.MidiMessage;
import javax.sound.midi.MidiEvent;
import javax.sound.midi.Sequencer;
import javax.sound.midi.Track;
import javax.sound.midi.Sequence;
import javax.sound.midi.MidiSystem;
import javax.sound.midi.MetaMessage;
import java.util.Vector;

public class Main{
    /**/*from w  w  w . j  av a2  s .  c  o  m*/
     * Take the NOTE_ON event noteOn (which is event i in track), and 
     * find the matching NOTE_OFF event.
     */
    public static MidiEvent findMatchingNoteOff(Track track,
            int noteOnIndex, MidiEvent noteOn) {
        assert isNoteOnEvent(noteOn);

        for (int i = noteOnIndex; i < track.size(); i++) {
            MidiEvent event = track.get(i);
            if (isNoteOffEvent(event)
                    && (getNoteValue(noteOn) == getNoteValue(event))) {
                return event;
            }
        }

        System.out.println("Could not find note off event for: "
                + DebugMidi.midiEventToString(noteOn));
        System.exit(1);
        return null;

    }
    /** 
     * Return true if event is a Note On event.
     */
    public static boolean isNoteOnEvent(MidiEvent event) {
        return isNoteOnMessage(event.getMessage());
    }
    /** 
     * Return true if event is a Note Off event.
     */
    public static boolean isNoteOffEvent(MidiEvent event) {
        return isNoteOffMessage(event.getMessage());
    }
    /**
     * Return the note value for a note on or note off event.
     */
    public static int getNoteValue(MidiEvent noteOnOff) {
        assert isNoteOnEvent(noteOnOff) || isNoteOffEvent(noteOnOff);

        return getNoteValue(noteOnOff.getMessage());
    }
    /**
     * Return the note value for a note on or off message.
     */
    public static int getNoteValue(MidiMessage noteOnOff) {
        assert isNoteOnMessage(noteOnOff) || isNoteOffMessage(noteOnOff);

        return noteOnOff.getMessage()[1];
    }
    /** 
     * Return true if message is a Note On message.
     */
    public static boolean isNoteOnMessage(MidiMessage message) {
        // The status can be a range of values, depending on what channel it is on.
        // Also, the velocity cannot be zero, otherwise it is a note off message.
        return message.getStatus() >= 144 && message.getStatus() < 160
                && getVelocity(message) > 0;
    }
    /** 
     * Return true if message is a Note Off message.
     */
    public static boolean isNoteOffMessage(MidiMessage message) {
        // It is a note off event if the status indicates it is a 
        // note off message.  Or, if it is a note on message and
        // the velocity is zero.
        return (message.getStatus() >= 128 && message.getStatus() < 144)
                || (message.getStatus() >= 144 && message.getStatus() < 160 && getVelocity(message) == 0);
    }
    /**
     * Return the velocity for a note on or note off event.
     */
    public static int getVelocity(MidiEvent noteOnOff) {
        // I can't check for this because isNoteOnMessage calls getVelocity
        //assert isNoteOnEvent(noteOnOff) || isNoteOffEvent(noteOnOff);

        return getVelocity(noteOnOff.getMessage());
    }
    /**
     * Return the velocity for a note on or off message.
     */
    public static int getVelocity(MidiMessage noteOnOff) {
        // I can't check for this because isNoteOnMessage calls getVelocity
        //assert isNoteOnMessage(noteOnOff) || isNoteOffMessage(noteOnOff);

        return noteOnOff.getMessage()[2];
    }
}

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