org.jaudiolibs.audioops.impl.GainOp Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of audioops-impl Show documentation
Various AudioOps implementations, some ported from OpenJDK / Gervill and RasmusDSP
The newest version!
/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2010 Neil C Smith.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details.
 *
 * You should have received a copy of the GNU General Public License version 2
 * along with this work; if not, see http://www.gnu.org/licenses/
 * 
 *
 * Linking this work statically or dynamically with other modules is making a
 * combined work based on this work. Thus, the terms and conditions of the GNU
 * General Public License cover the whole combination.
 *
 * As a special exception, the copyright holders of this work give you permission
 * to link this work with independent modules to produce an executable,
 * regardless of the license terms of these independent modules, and to copy and
 * distribute the resulting executable under terms of your choice, provided that
 * you also meet, for each linked independent module, the terms and conditions of
 * the license of that module. An independent module is a module which is not
 * derived from or based on this work. If you modify this work, you may extend
 * this exception to your version of the work, but you are not obligated to do so.
 * If you do not wish to do so, delete this exception statement from your version.
 *
 * Please visit http://neilcsmith.net if you need additional information or
 * have any questions.
 */
package org.jaudiolibs.audioops.impl;

import org.jaudiolibs.audioops.AudioOp;


/**
 * Basic gain op with smooth interpolation.
 *
 * Interpolation of gain happens over full length of buffer.
 *
 * @author Neil C Smith
 */
public class GainOp implements AudioOp {

    private float gain = 1;
    private float oldGain = 0;
    

    public void setGain(float gain) {
        if (gain < 0) {
            throw new IllegalArgumentException();
        }
        this.gain = gain;
    }

    public float getGain() {
        return gain;
    }

    public void reset(int samples) {
        oldGain = 0;
    }

    public void processReplace(int buffersize, float[][] outputs, float[][] inputs) {
        if (gain != 0 || oldGain != 0) {
            float[] in = inputs[0];
            float[] out = outputs[0];
            float g = oldGain;
            float delta = (gain - g) / buffersize;
            for (int i=0; i < buffersize; i++) {
                out[i] = g * in[i];
                g += delta;
            }
            oldGain = gain;
        } else {
            float[] out = outputs[0];
            for (int i=0; i