Return the number of note on and note off events in track for MIDI. - Java javax.sound.midi

Java examples for javax.sound.midi:MidiEvent

  1. HOME
  2. Java
  3. javax.sound.midi
  4. MidiEvent

Description

Return the number of note on and note off events in track for MIDI.

Demo Code


//package com.java2s;

import javax.sound.midi.MidiMessage;
import javax.sound.midi.MidiEvent;

import javax.sound.midi.Track;

public class Main {
    /**//from   w  w  w .  ja  v a  2s  .  c  o m
     * Return the number of note on and note off events in track.
     */
    public static int noteOnOffsInTrack(Track track) {
        int count = 0;

        for (int i = 0; i < track.size(); i++) {
            MidiEvent event = track.get(i);
            if (isNoteOnEvent(event) || isNoteOffEvent(event)) {
                count++;
            }
        }

        return count;
    }

    /** 
     * 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 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];
    }
}

Related Tutorials