/*
 * Copyright (c) 2003-2004, jMonkeyEngine - Mojo Monkey Coding
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of the Mojo Monkey Coding, jME, jMonkey Engine, nor the
 * names of its contributors may be used to endorse or promote products derived
 * from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 */
/**
 * Created on Apr 28, 2005
 */
package com.jme.sound.openAL.objects.util.dsp;

import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.DoubleBuffer;
import java.nio.ShortBuffer;
import java.nio.channels.GatheringByteChannel;



public class BandpassFilter extends Filter {

    private float qParam = 1.4f;

    private double alpha[];
    private double beta[];
    private double gamma[];   

    
    
    public BandpassFilter(int[] frequencies){
       super(frequencies);        
    }
    
    
    public void init(int rate){
        super.initalize(rate);
        alpha=new double[frequencies.length];
        beta=new double[frequencies.length];
        gamma=new double[frequencies.length];
        resetABC(qParam);
    }

    public void resetABC(double q) {
        for(int a=0; a<theta.length; a++){
            double tan = Math.tan(theta[a] / (2.0 * q));
            beta[a] = 0.5 * ((1.0 - tan) / (1.0 + tan));
            alpha[a] = (0.5 - beta[a]) / 2.0;
            gamma[a] = (0.5 + beta[a]) * Math.cos(theta[a]);
        }
    }

    public byte[] filter(byte[] input) {        
        ByteOrder order=ByteOrder.nativeOrder();
        ShortBuffer sbuf=ByteBuffer.wrap(input).order(order).asShortBuffer();
        short[] sinput=new short[input.length/2];
        for (int i=0; i < sinput.length; i++) {
            sinput[i] = (sbuf.get(i));
        }
        if(output==null){
            output=new double[sinput.length];
        }  
        for(int a=0; a<output.length; a++){
            output[a]=(double)sinput[a] * gainFactor;
        }
        
        for(int a=0; a<frequencies.length; a++){
            passBand(a, sinput);
        }
        for (int a = 0; a < output.length; a++) {
            sinput[a] =(short) Math.min(Short.MAX_VALUE, Math.max(output[a], Short.MIN_VALUE));
        }     
        return toByte(sinput, true);
    }
    
    
    /**
     * @param a
     * @param buffer
     */
    private void passBand(int passNumber, short[] sinput) {
        double[] inputArray = new double[3];
        double[] outputArray = new double[3];
        int i = 0, j = 0, k = 0;
        for (int a = 0; a < sinput.length; a++) {
            inputArray[i] = (double) sinput[a];
            j = i - 2;
            if (j < 0)
                j += 3;
            k = i - 1;
            if (k < 0)
                k += 3;
            outputArray[i] = 2 *(alpha[passNumber] * (inputArray[i] - inputArray[j]) 
                                            + gamma[passNumber] * outputArray[k] 
                                            - beta[passNumber] * outputArray[j]);
            
            output[a] += adjust[passNumber] * outputArray[i];
            i = (i + 1) % 3;
        }
        
        
     }

    public byte[] toByte(short[] array, boolean flag){
        byte[] outBuf=new byte[array.length*2];
        for(int a=0, b=0; a<array.length; a++, b+=2){
            byte[] ret=toByte(array[a], flag);
            outBuf[b]=ret[0];
            outBuf[b+1]=ret[1];
        }
        return outBuf;
    }
    

    public static final byte[] toByte(short value, boolean flag) {
        byte temp[] = new byte[2];
        for (byte b = 0; b <= 1; b++)
            temp[b] = (byte) (value >>> (1 - b) * 8);

        if (flag)
            temp = reverse_order(temp, 2);
        
        return temp;
        
    }

    public static final byte[] toByte(short s) {
        return toByte(s, false);
    }

    private static final byte[] reverse_order(byte array[], int i) {
        byte temp[] = new byte[i];
        for (byte b = 0; b <= i - 1; b++)
            temp[b] = array[i - 1 - b];

        return temp;
    }
    
    

    
   
    
 
}
@@ -1928,17 +1928,17 @@
 ram = 1.
-4
+0
 f;%0A%0A    

save work