samer@0: /*
samer@0:  *	LineSource.java
samer@0:  *
samer@0:  *	Copyright (c) 2012, 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@46: package ishara.audio;
samer@0: import javax.sound.sampled.*;
samer@0: import java.io.*;
samer@0: 
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: */
samer@0: 
samer@0: public class LineSource extends AudioSource
samer@0: {
samer@0: 	private TargetDataLine	line;
samer@0: 	private int bufsize;
samer@0: 
samer@0: 	/** Create LineSource reading from given TargetDataLine */
samer@0: 	public LineSource(AudioFormat f, int bufsize) throws Exception {
samer@0: 		this((TargetDataLine)AudioSystem.getLine(lineInfo(f,bufsize)),f,bufsize);
samer@0: 	}
samer@0: 
samer@0: 	public LineSource(TargetDataLine l,AudioFormat f,int bs) throws Exception {
samer@0: 		super(f); line=l; 
samer@0: 		print("Opening audio data line: "+f);
samer@0: 		if (bs==0) line.open(f); else line.open(f,bs);
samer@0: 		bufsize=line.getBufferSize();
samer@0: 	}
samer@0: 
samer@0: 	public void dispose() {
samer@0: 		print("Closing audio data line");
samer@0: 		try { line.close(); }
samer@0: 		catch (Exception ex) {
samer@0: 			print("line failed to close: "+ex);
samer@0: 		}
samer@0: 	}
samer@0: 
samer@0: 	public void start() { line.flush(); line.start(); }
samer@0: 	public void stop() { line.stop(); }
samer@0: 	public int  read(byte [] buf, int offs, int len) throws Exception {
samer@0: 		return line.read(buf,offs,len);
samer@0: 	}
samer@0: 
samer@0: 	public DataLine getLine() { return line; }
samer@0: 	public void check() { print("LineSource buffer room available: "+(bufsize-line.available())); }
samer@0: 	public String toString() { return "LineSource("+line.getFormat()+")"; }
samer@0: 
samer@0: 	public static DataLine.Info lineInfo(AudioFormat fmt) { return lineInfo(fmt,0); }
samer@0: 	public static DataLine.Info lineInfo(AudioFormat fmt, int bufsize) {
samer@0: 		if (bufsize==0)
samer@0: 			return new DataLine.Info( TargetDataLine.class, fmt); 
samer@0: 		else
samer@0: 			return new DataLine.Info( TargetDataLine.class, fmt, bufsize); 
samer@0: 	}
samer@0: }
samer@0: