Given a musical pitch (C4, C#-1, D9...), give back the midi value. - Java javax.sound.midi

Java examples for javax.sound.midi:MidiSystem

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Description

Given a musical pitch (C4, C#-1, D9...), give back the midi value.

Demo Code


//package com.java2s;

public class Main {
    /**/*  w w w  .  j  ava  2s  . co  m*/
     * Given a musical pitch (C4, C#-1, D9...), give back the midi value.
     */
    public static int getValueFromNote(String noteAndOctave) {
        // I got this from here:
        // http://www.harmony-central.com/MIDI/Doc/table2.html
        if (!noteAndOctave
                .matches("^(C|C#|D|D#|E|F|F#|G|G#|A|A#|B)(-1|[0-9])$")) {
            System.out.println("note " + noteAndOctave
                    + " is not a muscial note.");
            System.exit(1);
        }

        char note = noteAndOctave.charAt(0);

        int noteValue = -100;

        switch (note) {
        case 'C':
            noteValue = 0;
            break;
        case 'D':
            noteValue = 2;
            break;
        case 'E':
            noteValue = 4;
            break;
        case 'F':
            noteValue = 5;
            break;
        case 'G':
            noteValue = 7;
            break;
        case 'A':
            noteValue = 9;
            break;
        case 'B':
            noteValue = 11;
            break;
        default:
            System.out.println("This should never be reached.");
            System.exit(1);
            break;
        }

        boolean sharp = noteAndOctave.contains("#");

        // if it's sharp, the note value goes up by one
        if (sharp) {
            //System.out.println("There is a sharp");
            noteValue += 1;
        }

        //System.out.println("notevalue: " + noteValue);

        int octaveIndex = -100;

        // set the starting index for the octave
        if (sharp)
            octaveIndex = 2;
        else
            octaveIndex = 1;

        //System.out.println("octaveIndex is " + octaveIndex);

        int octave = -100;

        try {
            // figure out the octave
            octave = Integer.parseInt(noteAndOctave.substring(octaveIndex));
        } catch (Exception e) {
            e.printStackTrace();
            System.exit(1);
        }

        //System.out.println("octave is " + octave);

        return (octave + 1) * 12 + noteValue;
    }
}

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