Return the note value for a note on or note off event for MIDI. - Java javax.sound.midi

Java examples for javax.sound.midi:MidiEvent

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Description

Return the note value for a note on or note off event for MIDI.

Demo Code


//package com.java2s;

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

public class Main {
    /**/*ww w  . j a  v  a2s . c o m*/
     * 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 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];
    }
}

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