comparison src/samer/units/Wavetable.java @ 0:bf79fb79ee13

Initial Mercurial check in.

+/*
+ *	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.core.*;
+import  samer.maths.*;
+import  samer.maths.random.*;
+
+/**
+	Periodic generator: generates periodic signal from
+	a wave table
+ */
+
+public class Wavetable implements Generator
+{
+	int		start, end, j;
+	Vec		vec;
+	double [] pp;
+
+	public Wavetable(Vec vec) {
+		this(vec,0,vec.size());
+	}
+
+	public Wavetable(Vec vec, int start, int end) 
+	{ 
+		this.vec   = vec;
+		this.start = start;
+		this.end   = end;
+		pp = vec.array();
+		j = start;
+	}
+
+	public int  period() { return end-start; }
+	public void dispose() {}
+	public double next() 
+	{ 
+		double r=pp[j++]; 
+		if (j>=end) j=start; 
+		return r; 
+	}
+
+	public void next(double [] x) 
+	{ 
+		int	remaining=x.length;
+		int	iput=0;
+
+		while (remaining>0) {
+			int avail = end-j;
+			int block = remaining > avail ? avail : remaining;
+
+			System.arraycopy( pp, j, x,iput, block);
+			j+=block; iput+=block; remaining-=block;
+			if (j>=end) j=start;
+		}
+	}
+
+	public String toString() { return "wavetable"; }
+} 
+		
+