samer@0: /*
samer@0:  *	Copyright (c) 2000, Samer Abdallah, King's College London.
samer@0:  *	All rights reserved.
samer@0:  *
samer@0:  *	This software is provided AS iS and WITHOUT ANY WARRANTY;
samer@0:  *	without even the implied warranty of MERCHANTABILITY or
samer@0:  *	FITNESS FOR A PARTICULAR PURPOSE.
samer@0:  */
samer@0: 
samer@0: package samer.midi;
samer@0: import samer.core.*;
samer@0: import samer.core.types.*;
samer@0: import samer.core.util.*;
samer@0: import samer.tools.*;
samer@0: import samer.maths.*;
samer@0: import java.util.*;
samer@0: import java.io.*;
samer@0: import javax.sound.midi.*;
samer@0: 
samer@0: 
samer@0: /**
samer@0: 	A class which generates midi events from the
samer@0: 	values of an input vector. Each element of the vector
samer@0: 	corresponds to a certain midi note number. The loudness
samer@0: 	of a note depends on the value of the corresponding
samer@0: 	vector element.
samer@0: 
samer@0: 	Parameters:
samer@0: 		trigger note on events.
samer@0: 
samer@0: 		offset is added to the vector element number to get a
samer@0: 		midi note number.
samer@0: 
samer@0: 		pedal control whether or not note off events are generated
samer@0:   */
samer@0: 
samer@0: public class MidiSynth extends Viewable implements Agent, Task, Saveable
samer@0: {
samer@2: 	VVector			in;
samer@2: 	Synthesizer		synthesizer=null;
samer@2: 
samer@0: 	protected int			n;
samer@0: 	protected double		[] x;
samer@0: 	protected int			[] nnums;
samer@0: 	protected int			[] chans;
samer@0: 	protected MidiChannel	[] cc;
samer@0: 
samer@0: 	protected VDouble		factor;
samer@0: 	protected VInteger	offset;
samer@0: 	protected VBoolean	pedal;
samer@0: 
samer@2: 	public MidiSynth(VVector input)
samer@0: 	{
samer@0: 		super("midisynth");
samer@0: 
samer@0: 		Shell.push(node);
samer@0: 		factor = new VDouble("factor",128,0);
samer@0: 		offset = new VInteger("offset",0,0);
samer@0: 		pedal  = new VBoolean("pedal",false,0);
samer@0: 		setAgent(this);
samer@0: 		addAgent(new Saver(this));
samer@0: 		Shell.pop();
samer@0: 
samer@2: 		in = input;
samer@2: 		n = in.size();
samer@2: 		x = in.array();
samer@0: 
samer@0: 		nnums = new int[n];
samer@0: 		chans = new int[n];
samer@0: 		for (int i=0; i<n; i++) { nnums[i]=i; chans[i]=0; }
samer@0: 
samer@0: 		try { getAgent().execute("load", Shell.env()); open(); }
samer@0: 		catch (Exception ex) { ex.printStackTrace(); }
samer@0: 	}
samer@0: 
samer@0: 	public Viewer getViewer() {
samer@0: 		return new BaseViewer(this) {
samer@0: 			{
samer@0: 				panel().setLayout( new StackLayout(3));
samer@0: 				add(factor);
samer@0: 				add(offset);
samer@0: 				add(pedal);
samer@0: 				add(Shell.createButtonsFor(MidiSynth.this));
samer@0: 			}
samer@0: 		};
samer@0: 	}
samer@0: 
samer@2: 	public void open() throws Exception {
samer@2: 		if (synthesizer!=null) { Shell.print("already open"); return; }
samer@2: 		if ((synthesizer = MidiSystem.getSynthesizer()) == null) {
samer@2: 			throw new Exception("getSynthesizer() failed");
samer@2: 		}
samer@2: 		Shell.print("opening synthesizer");
samer@2: 		synthesizer.open();
samer@2: 
samer@2: 		cc = synthesizer.getChannels();
samer@2: 		Shell.print("got synth and channel:"+synthesizer+cc);
samer@2: 	}
samer@2: 
samer@2: 	public void close() {
samer@2: 		if (synthesizer != null) {
samer@2: 			Shell.print("closing synthesiser");
samer@2: 			synthesizer.close();
samer@2: 			synthesizer = null;
samer@2: 		}
samer@2: 	}
samer@2: 
samer@0: 	public void dispose() {
samer@0: 		close();
samer@0: 		factor.dispose();
samer@0: 		offset.dispose();
samer@0: 		pedal.dispose();
samer@0: 		super.dispose();
samer@0: 	}
samer@0: 
samer@0: 	public void silence() {
samer@0: 		for (int i=0; i<n; i++) {
samer@0: 			cc[chans[i]].noteOff(nnums[i]+offset.value, 0);
samer@0: 		}
samer@0: 	}
samer@0: 
samer@0: 	public void starting() {}
samer@0: 	public void stopping() {}
samer@0: 	public void run()
samer@0: 	{
samer@2: 		if (synthesizer==null) return;
samer@2: 
samer@0: 		for (int i=0; i<n; i++) {
samer@0: 			if (x[i]>0) {
samer@0: 				cc[chans[i]].noteOn(nnums[i]+offset.value,mapVelocity(x[i]));
samer@0: 			} else if (x[i]<0 && !pedal.value) {
samer@0: 				cc[chans[i]].noteOff(nnums[i]+offset.value, 0);
samer@0: 			}
samer@0: 		}
samer@0: 	}
samer@0: 
samer@0: 	public void getCommands(Agent.Registry r) {
samer@0: 		r.add("open").add("close").add("silence").add("edit");
samer@0: 	}
samer@0: 
samer@0: 	public void execute(String cmd, Environment env) throws Exception
samer@0: 	{
samer@0: 		if (cmd.equals("open")) open();
samer@0: 		else if (cmd.equals("close"))	close();
samer@0: 		else if (cmd.equals("silence"))	silence();
samer@0: 		else if (cmd.equals("edit"))
samer@0: 			Shell.expose( new Editor(),"MidiSynthEditor");
samer@0: 	}
samer@0: 
samer@0: 	public void save(OutputStream s) throws Exception 	{
samer@0: 		ObjectOutputStream	o=new ObjectOutputStream(s);
samer@0: 		o.writeObject(nnums);
samer@0: 		o.writeObject(chans);
samer@0: 		o.flush();
samer@0: 	}
samer@0: 
samer@0: 	public void load(InputStream s)  throws Exception {
samer@0: 		ObjectInputStream	o=new ObjectInputStream(s);
samer@0: 		int [] newnotes = (int [])o.readObject();
samer@0: 		int [] newchans = (int [])o.readObject();
samer@0: 		safecopy( newnotes, nnums);
samer@0: 		safecopy( newchans,chans);
samer@0: 	}
samer@0: 
samer@0: 	public void read(Reader r) throws Exception { throw new Exception("unsupported"); }
samer@0: 	public void write(Writer w) throws Exception { throw new Exception("unsupported"); }
samer@0: 
samer@0: 	private static void safecopy( int [] src, int [] dest) 	{
samer@0: 		int n=src.length; if (dest.length<n) n=dest.length;
samer@0: 		System.arraycopy( src, 0, dest, 0, n);
samer@0: 	}
samer@0: 
samer@0: 	public int mapVelocity(double x) {
samer@0: 		int vel=(int)(factor.value*x);
samer@0: 		if (vel>127) vel=127;
samer@0: 		return vel;
samer@0: 	}
samer@0: 
samer@0: 	class Editor extends BaseViewer
samer@0: 	{
samer@0: 		VInteger	i=new VInteger("input number",0,Variable.NOINIT);
samer@0: 		VInteger	n=new VInteger("note number",nnums[0],Variable.NOINIT);
samer@0: 		VInteger	c=new VInteger("channel number",chans[0],Variable.NOINIT);
samer@0: 		VInteger    p=new VInteger("program",0,0);
samer@0: 		VBoolean	l1=new VBoolean("lock note",false,Variable.NOINIT);
samer@0: 		VBoolean	l2=new VBoolean("lock channel",false,Variable.NOINIT);
samer@0: 
samer@0: 		public Editor() {
samer@0: 			super(MidiSynth.this);
samer@0: 
samer@0: 			i.setRange(0,nnums.length-1);
samer@0: 			n.setRange(0,127);
samer@0: 			c.setRange(0,15);
samer@0: 			n.setRange(0,127);
samer@0: 			p.setRange(0,127);
samer@0: 			setLayout( new StackLayout());
samer@0: 			add(i);	add(n); 	add(c);
samer@0: 			add(p);	add(l1); 	add(l2);
samer@0: 			i.addObserver(this);
samer@0: 			n.addObserver(this);
samer@0: 			c.addObserver(this);
samer@0: 			p.addObserver(this);
samer@0: 		}
samer@0: 
samer@0: 		public void update(Observable o, Object arg)
samer@0: 		{
samer@0: 			disposeFilter(o,arg);
samer@0: 			if (arg==this) return; // &&&
samer@0: 			if (o==i) {
samer@0: 				if (l1.value) { nnums[i.value]=n.value; }
samer@0: 				else { n.value = nnums[i.value]; n.changed(this); }
samer@0: 
samer@0: 				if (l2.value) { chans[i.value]=c.value; }
samer@0: 				else { c.value = chans[i.value]; c.changed(this); }
samer@0: 
samer@0: 				p.value = cc[c.value].getProgram();
samer@0: 				p.changed(this);
samer@0: 			} else if (o==n) {
samer@0: 				nnums[i.value]=n.value;
samer@0: 			} else if (o==c) {
samer@0: 				chans[i.value]=c.value;
samer@0: 			} else if (o==p) {
samer@0: 				cc[c.value].programChange(p.value);
samer@0: 			}
samer@0: 		}
samer@0: 	}
samer@0: }