samer@0: /*
samer@0:  *	LineSource.java
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.audio;
samer@0: import  samer.core.*;
samer@0: import  samer.tools.*;
samer@0: import  java.io.*;
samer@0: import  javax.sound.sampled.*;
samer@0: 
samer@0: /**
samer@0: 	An AudioSource that reads from the sound card in real time.
samer@0: 	Uses a standard JavaSound TargetDataLine to get data.
samer@0: 	However, an alternative DataLine can be supplied instead.
samer@0: 	Audio format is determined by current environment--see
samer@0: 	VLine.
samer@0: 	<p> Object is a Viewable, and is called "linein". Node is
samer@0: 	created in current context, ie with a parent determined by
samer@0: 	current Environment.
samer@0: 	@see samer.core.AudioSource
samer@0: */
samer@0: 
samer@0: public class LineSource extends VLine implements AudioSource
samer@0: {
samer@0: 	private TargetDataLine	line;
samer@0: 	private AudioFormat	fmt;
samer@0: 	private int          bufsize=0;
samer@0: 
samer@0: 	/** Create LineSource reading from given TargetDataLine */
samer@0: 	public LineSource(TargetDataLine l,AudioFormat f) throws Exception {
samer@0: 		super("linein"); line=l; fmt=f;
samer@0: 	}
samer@0: 
samer@1: 	public int getChannels() { return fmt.getChannels(); }
samer@1: 	public float getRate() { return fmt.getFrameRate(); }
samer@1: 	public AudioFormat getFormat() { return fmt; }
samer@0: 	public void setBufferSize(int b) { bufsize=b; }
samer@0: 
samer@0: 	public DataLine getLine() { return line; }
samer@0: 	public boolean  isOpen() { return line.isOpen(); }
samer@0: 
samer@0: 	/** Open using default format */
samer@0: 	public void openImpl() throws Exception {
samer@0: 		if (bufsize==0) line.open(fmt); else line.open(fmt,bufsize);
samer@0: 	}
samer@0: 
samer@0: 	public void closeImpl() throws Exception { line.close(); }
samer@0: 
samer@0: 	public Task reader(final double dbuf[], final int off, final int len) {
samer@0: 		return new Reader(2*len) {
samer@0: 			public void run() throws Exception {
samer@0: 				super.run();	Util.shortToDouble(buf,dbuf,off,len);
samer@0: 			}
samer@0: 		};
samer@0: 	}
samer@0: 
samer@0: 	public Task reader(final float dbuf[], final int off, final int len) {
samer@0: 		return new Reader(2*len) {
samer@0: 			public void run() throws Exception {
samer@0: 				super.run();	Util.shortToFloat(buf,dbuf,off,len);
samer@0: 			}
samer@0: 		};
samer@0: 	}
samer@0: 
samer@0: 
samer@0: 	protected class Reader implements Task {
samer@0: 		byte buf[];
samer@0: 		int		size;
samer@0: 
samer@0: 		public Reader(int bufsize) { size=bufsize; buf=new byte[size]; }
samer@0: 
samer@0: 		public void starting() { start(); }
samer@0: 		public void stopping() { stop(); }
samer@0: 		public void dispose() {}
samer@0: 		public void run() throws Exception {
samer@0: 			if (line.read(buf,0,size)<=0) throw new EOFException();
samer@0: 			changed();
samer@0: 		}
samer@0: 	}
samer@0: 
samer@0: 	public static DataLine.Info lineInfo(AudioFormat fmt) {
samer@0: 		return new DataLine.Info( TargetDataLine.class, fmt); 
samer@0: 	}
samer@0: 
samer@0: 	public static DataLine.Info lineInfo(AudioFormat fmt, int bufsize) {
samer@0: 		return new DataLine.Info( TargetDataLine.class, fmt, bufsize); 
samer@0: 	}
samer@0: }
samer@0: