Chimes.java

import java.util.*;     // required for date / time function
import javax.sound.midi.*;  // required to play musical notes

public class Chimes {

    /**
    *   Program:    Chimes.java
    *   Purpose:    Play musical chimes every quarter hour
    *   Creator:    Chris Clarke
    *   Created:    28.06.2009
    */

    public static void playSequence(String s) {
        int duration;
        for (int i=0; i<4; i++) {
            if (i==3)
                duration = 12;
            else
                duration = 6;
            if (s.charAt(i)=='G')
                // parameters are voice (0-15),pitch,duration,volume
                np.playNote(VOICE,G,duration,VOLUME);
            if (s.charAt(i)=='C')
                np.playNote(VOICE,C,duration,VOLUME);
            if (s.charAt(i)=='D')
                np.playNote(VOICE,D,duration,VOLUME);
            if (s.charAt(i)=='E')
                np.playNote(VOICE,E,duration,VOLUME);
        }
    } // end playSequence

    public static void playAChime(int hour, int min) {
        if (min==15&&!played) {
            playSequence(SEQUENCE0);
            played = true;
        } else if (min==30&&!played) {
            playSequence(SEQUENCE1);
            playSequence(SEQUENCE2);
            played = true;
        } else if (min==45&&!played) {
            playSequence(SEQUENCE3);
            playSequence(SEQUENCE4);
            playSequence(SEQUENCE0);
            played = true;
        } else if (min==0&&!played) {
            playSequence(SEQUENCE1);
            playSequence(SEQUENCE2);
            playSequence(SEQUENCE3);
            playSequence(SEQUENCE4);
            for (int i=0; i<hour; i++)
                np.playNote(VOICE, G1, 12, VOLUME); // play hour
            played = true;
        }
        if (min==17 || min==32 || min==47 || min==2)
            played=false;
    } // end playAChime

    public static void main(String[] args) {
        np.loadInstr(); // load instruments
        GregorianCalendar now;
        do {
            now = new GregorianCalendar();
            playAChime(now.get(Calendar.HOUR), now.get(Calendar.MINUTE));
        } while (true);
    } // end main

    public static NotePlayer np = new NotePlayer();
    public static final int VOICE = 5;
    public static final int VOLUME = 500;

    public static final int C = 72;
    public static final int G = C-5;
    public static final int D = C+2;
    public static final int E = C+4;
    public static final int G1 = G-12;

    public static boolean played = false;

    public static final String SEQUENCE0 = "EDCG";
    public static final String SEQUENCE1 = "CEDG";
    public static final String SEQUENCE2 = "CDEC";
    public static final String SEQUENCE3 = "ECDG";
    public static final String SEQUENCE4 = "GDEC";
}

class NotePlayer {

    /**
    *   Program: NotePlayer.java
    *   Purpose: Simple musical note player, plays a single note.
    *   Creator: Chris Clarke
    *   Created: July 2007
    */

    MidiChannel[]   mc;
    Synthesizer     synth;
    Instrument[]    instr;
    int     tmpo = 500; // fixed tempo of 120 bpm

    public void loadInstr() {
        // only necessary to run this method once
        for (int voice=0; voice<16; voice++) {
            try {
                synth = MidiSystem.getSynthesizer();
                synth.open();

                mc = new MidiChannel[16];
                mc = synth.getChannels();
                instr = synth.getDefaultSoundbank().getInstruments();
                synth.loadInstrument(instr[voice]); // 0-15
            }
            catch (Exception e) {System.out.println("Caught exception");}
        }
    } // end loadInstr()

    public void playNote(int voice, int pitch, int duration, int vol) {
        // play note
        mc[voice].noteOn(pitch, vol);
        for (int i=0; i<duration; i++) {
            try {
                    Thread.sleep(tmpo/4); // pause for one semiquaver
            } catch (InterruptedException e) {}
        }
        // stop playing it
        mc[voice].noteOff(pitch, vol);
    } // end playNote(int, int, int, int)

    public void playNote(int voice, int pitch, int vol) {
        // play note for natural duration of note or sound
        mc[voice].noteOn( pitch, vol);
    } // end playNote(int, int, int)
} // end class