Name: rlT66838			Date: 06/21/2000


java version "1.3.0"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.0-C)
Java HotSpot(TM) Client VM (build 1.3.0-C, mixed mode)


1) I fill a sequence with 100 MetaMessage events, handling meta messages by
printing a line of text to the screen.

2) The code below should print the line "got Meta #0" 100 times, once every
other beat at 100 BPM.  The behavior is nondeterministic: sometimes I get one
callback, maybe 10 seconds from runtime, and other times no callback at all.

(Apologies for weird cruft, as I have torn this snippet out of a larger code
base.  All I am trying to get here are my callbacks.)

3) n/a

4) n/a

5) SoundBlaster Live, not sure who's synth as I am just requesting the
MidiSystem.getSequencer().


************code:

import javax.sound.midi.*;
import java.lang.*;
import java.util.*;
import java.io.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

class Demo2 {


    static ShortMessage MidiMsg3(int a, int b, int c) {
	try {
	    ShortMessage msg = new ShortMessage();
	    msg.setMessage((byte)a,(byte)b,(byte)c);
	    return msg;
	} catch(InvalidMidiDataException ex) {
	    throw new RuntimeException();
	}
    }

    class SequenceImprovisor implements MetaEventListener {
	//Synthesizer synth;
	Instrument[] instruments;
	Sequencer sequencer;
	Sequence sequence;
	Track track;

	SequenceImprovisor() {
	    try {

	    sequencer=MidiSystem.getSequencer();
	    sequence=new Sequence(Sequence.PPQ,10);
	    track=sequence.createTrack();
	    sequencer.addMetaEventListener(this);

	    ShortMessage smsg;
	    
	    smsg = MidiMsg3(ShortMessage.NOTE_OFF+0,44,64);
	    track.add(new MidiEvent(smsg,10000));
	    smsg = MidiMsg3(ShortMessage.NOTE_ON+0,45,64);
	    track.add(new MidiEvent(smsg,10));
	    smsg = MidiMsg3(ShortMessage.NOTE_OFF+0,45,64);
	    track.add(new MidiEvent(smsg,20));

	    byte[] data = new byte[1];

	    for(int c=0; c<100; c++) {
		MetaMessage meta;
		data[0]=(byte)c;
		meta = new MetaMessage();
		//meta.setMessage(0,data,1); // type, data, length
		track.add(new MidiEvent(meta,c*20));
	    }
	    sequencer.setSlaveSyncMode(Sequencer.SyncMode.INTERNAL_CLOCK);
	    sequencer.setMasterSyncMode(Sequencer.SyncMode.INTERNAL_CLOCK);
	    sequencer.open();
	    sequencer.setSequence(sequence);
	    sequencer.setTempoInBPM(100);
	    this.start();
	    }
	    catch(InvalidMidiDataException ex) {}
	    catch(MidiUnavailableException ex) {}
	}
	void start() {sequencer.start();}
	void stop() {sequencer.stop();}

	int noteNum=0;
	void addNote(int pitch) {
	    ShortMessage msg;
	    byte[] data;

	    msg = MidiMsg3(ShortMessage.NOTE_ON+0,pitch,64);
	    track.add(new MidiEvent(msg,noteNum*10));

	    msg = MidiMsg3(ShortMessage.NOTE_OFF+0,pitch,64);
	    track.add(new MidiEvent(msg,noteNum*10+5));

	    noteNum++;
	}
	public void meta(MetaMessage msg) {
	    byte num=0;  //msg.getData()[0];
	    System.out.println("got Meta #"+num);
	}
    }


    SequenceImprovisor sequenceImprovisor;

    Demo2() {
	sequenceImprovisor = new SequenceImprovisor();
    }

    public static void main(String[] argv) {
	Demo2 demo2=new Demo2();
    }
}
(Review ID: 106361) 
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