annotate src/samer/units/LineIn.java @ 8:5e3cbbf173aa tip

Reorganise some more

/*
 *	Copyright (c) 2000, Samer Abdallah, King's College London.
 *	All rights reserved.
 *
 *	This software is provided AS iS and WITHOUT ANY WARRANTY;
 *	without even the implied warranty of MERCHANTABILITY or
 *	FITNESS FOR A PARTICULAR PURPOSE.
 */

package samer.units;
import samer.maths.*;
import samer.core.*;
import samer.audio.*;
import samer.tools.*;

/**
	Manages sliding window audio input.
	Acts as a sort of envelope class for audio input, containing the source,
	the destination vector, and the associated reader task.
*/

public class LineIn implements Task
{
	private	AudioSource		source;
	private	Task						reader=new NullTask();
	private	VVector				B;
	private	int							N, m;
	private	double[]				buf;

	public LineIn(AudioSource src, int N, int m) throws Exception {
		Shell.print("LineIn: size="+N+", step="+m);

		this.N=N; this.m=m; source=src;
		B = new VVector(new Node("waveform"),N);
		buf=B.array(); setStep(m);
	}

	public Vec output() { return B; }
	public int getStep() { return m; }
	public void setStep(int m) {
		reader.dispose(); this.m=m;
		reader=source.reader(buf,N-m,m);
  	}

	public AudioSource getSource() { return source; }
	public AudioSource setSource(AudioSource s) {
		AudioSource old=source; source=s; setStep(m);
		return old;
	}

	public void dispose() { reader.dispose(); source.dispose(); B.dispose(); }
	public void starting() { reader.starting(); }
	public void stopping() { reader.stopping(); }
	public void run() throws Exception {
		if (N>m) System.arraycopy(buf,m,buf,0,N-m);
		reader.run(); B.changed();
	}

	public String toString() { return "LineIn("+N+","+m+")->"+B; }
}