package jmsltutorial;

import java.awt.*;
import java.net.MalformedURLException;
import java.net.URL;

import com.softsynth.jmsl.*;
import com.softsynth.jmsl.midi.MidiIO_JavaSound;
import com.softsynth.jmsl.midi.MidiInstrument;

/**
 * Set JMSL midi output to Java Sound MIDI device. For this to work in an
 * applet, Java Sound midi needs a soundbank Ine of two way to acheive this: 1)
 * the path to the soundbank should be on the local machine in
 * (jre/)lib/audio/soundbank.gm. You may have to make the "audio" directory
 * manually and install the soundbank manually. 2) Provide MidiIO_JavaSound with
 * a URL to a soundbank on the same server as the applet (see the call to
 * setSoundbankURL() in start() )
 * 
 * <pre>
 * 
 *  
 *   
 *    
 *     
 *      NOTE TO WINDOWS USERS!
 *      JavaSound Midi applet notes, Windows XP
 *     
 *      Applets using JavaSound MIDI ( javax.sound.midi ) will not work using the standard Sun Java plugin distribution.
 *      You must manually install a soundbank for the Java plugin to use. (or provide MidiIO_JavaSound with a URL to a soundbank)
 *     
 *      To install a soundbank locally, find out where your Java plugin is installed:
 *      Control Panel -&gt; Java Plug-in -&gt; Advanced tab (read location under Java Runtime Environment listing)
 *      My Java plugin is in C:\Program Files\Java\j2re1.4.1_07
 *     
 *      In Windows Explorer, I browsed to C:\Program Files\Java\j2re1.4.1_07 and opened the &quot;lib&quot; folder
 *      In &quot;lib&quot; I made New Folder named &quot;audio&quot;
 *     
 *      From various jsdk installations, I found and copied soundbank.gm into the new audio folder [ C:\Program Files\Java\j2re1.4.1_07\lib\audio ]
 *     
 *      
 *     
 *    
 *   
 *  
 * </pre>
 * 
 * @author Nick Didkovsky, email: didkovn@mail.rockefeller.edu, (c) 2003 Nick
 *         Didkovsky, all rights reserved.
 *  
 */

public class JavaSoundMidiApplet extends java.applet.Applet {

    MusicShape m;

    //    Frame mixerFrame;

    public void init() {
        JMSL.setIsApplet(true);
        setLayout(new BorderLayout());
        add(BorderLayout.NORTH, new Label("JMSL JavaSound MIDI test"));
        TextArea textArea = new TextArea(10, 80);
        add(BorderLayout.SOUTH, textArea);
        String msg = "JMSL is playing a MIDI melody with JavaSound MIDI right now\n";
        msg += " If you hear nothing, you probably need to install a soundbank.\n";
        msg += "The path of a soundbank should be (jre/)lib/audio/soundbank.gm\n";
        msg += "You may have to install the soundbank manually. You can download a soundbank of your choice\n";
        msg += "at http://java.sun.com/products/java-media/sound/soundbanks.html\n";
        msg += "More instructions are there.\n\n";
        msg += " Or call ((MidiIO_JavaSound) JMSL.midi).setSoundbankURL(new URL(\"URLtoMyOnlineSoundBank.gm\"))\n";

        textArea.append(msg);
    }

    public void start() {
        synchronized (JMSL.class) {
            JMSL.clock = new DefaultMusicClock();
            JMSL.scheduler = new EventScheduler();
            JMSL.scheduler.start();
            JMSL.midi = MidiIO_JavaSound.instance(); // Use Sun's MIDI Library
            try {
                ((MidiIO_JavaSound) JMSL.midi).setSoundbankURL(new URL(getCodeBase(), "javasound/soundbank.gm"));
            } catch (MalformedURLException e) {
                e.printStackTrace();
            }
            JMSL.midi.open();
            MidiInstrument ins = new MidiInstrument();
            buildMixer(ins); 
            // optional, but nice - give user pan/amp control panel
            buildMusicShape(ins);
            m.launch(JMSL.now());
        }
    }

    private void buildMusicShape(MidiInstrument ins) {
        m = new MusicShape(4);
        m.setInstrument(ins);
        m.setRepeats(100000);
        m.add(1.0, 65, JMSLRandom.choose(80, 127), 2.5);
        m.add(0.5, 66, JMSLRandom.choose(80, 127), 1.5);
        m.add(0.75, 58, JMSLRandom.choose(80, 127), 1.5);
        m.add(0.75, 60, JMSLRandom.choose(80, 127), 1.5);
        m.add(0.5, 69, JMSLRandom.choose(80, 127), 1.0);
        m.addRepeatPlayable(new Playable() {

            private int fromIndex;
            private int toIndex;

            public double play(double time, Composable parent) throws InterruptedException {
                MusicShape s = (MusicShape) parent;
                chooseRange(s);
                s.scramble(fromIndex, toIndex, 0);
                chooseRange(s);
                s.scramble(fromIndex, toIndex, 1);
                return time;
            }

            private void chooseRange(MusicShape s) {
                fromIndex = JMSLRandom.choose(s.size());
                toIndex = JMSLRandom.choose(s.size());
                if (fromIndex > toIndex) {
                    int temp = fromIndex;
                    fromIndex = toIndex;
                    toIndex = temp;
                }
            }
        });
    }

    private void buildMixer(MidiInstrument ins) {
        JMSLMixerContainer mixer = new JMSLMixerContainer();
        mixer.addInstrument(ins, 0.5, 1.0); // ins, pan (0..1), amp (0..1)
        mixer.start();
        add(mixer.getPanAmpControlPanel());
    }

    public void stop() {
        synchronized (JMSL.class) {
            m.finishAll();
            try {
                m.waitForDone();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            JMSL.scheduler.stop();
            JMSL.closeMusicDevices();
        }
    }
}