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.units;
samer@0: import samer.maths.*;
samer@0: import samer.core.*;
samer@0: import samer.audio.*;
samer@0: import samer.tools.*;
samer@0: 
samer@0: /**
samer@0: 	Manages sliding window audio input.
samer@0: 	Acts as a sort of envelope class for audio input, containing the source,
samer@0: 	the destination vector, and the associated reader task.
samer@0: */
samer@0: 
samer@0: public class LineIn implements Task
samer@0: {
samer@0: 	private	AudioSource		source;
samer@0: 	private	Task						reader=new NullTask();
samer@0: 	private	VVector				B;
samer@0: 	private	int							N, m;
samer@0: 	private	double[]				buf;
samer@0: 
samer@0: 	public LineIn(AudioSource src, int N, int m) throws Exception {
samer@0: 		Shell.print("LineIn: size="+N+", step="+m);
samer@0: 
samer@0: 		this.N=N; this.m=m; source=src;
samer@0: 		B = new VVector(new Node("waveform"),N);
samer@0: 		buf=B.array(); setStep(m);
samer@0: 	}
samer@0: 
samer@0: 	public Vec output() { return B; }
samer@0: 	public int getStep() { return m; }
samer@0: 	public void setStep(int m) {
samer@0: 		reader.dispose(); this.m=m;
samer@0: 		reader=source.reader(buf,N-m,m);
samer@0:   	}
samer@0: 
samer@0: 	public AudioSource getSource() { return source; }
samer@0: 	public AudioSource setSource(AudioSource s) {
samer@0: 		AudioSource old=source; source=s; setStep(m);
samer@0: 		return old;
samer@0: 	}
samer@0: 
samer@0: 	public void dispose() { reader.dispose(); source.dispose(); B.dispose(); }
samer@0: 	public void starting() { reader.starting(); }
samer@0: 	public void stopping() { reader.stopping(); }
samer@0: 	public void run() throws Exception {
samer@0: 		if (N>m) System.arraycopy(buf,m,buf,0,N-m);
samer@0: 		reader.run(); B.changed();
samer@0: 	}
samer@0: 
samer@0: 	public String toString() { return "LineIn("+N+","+m+")->"+B; }
samer@0: }
samer@0: