140 lines
4.6 KiB
Java
140 lines
4.6 KiB
Java
/*
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* Copyright (c) 2007, 2013, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package com.sun.media.sound;
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/**
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* A standard transformer used in connection blocks.
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* It expects input values to be between 0 and 1.
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*
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* The result of the transform is
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* between 0 and 1 if polarity = unipolar and
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* between -1 and 1 if polarity = bipolar.
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*
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* These constraints only applies to Concave, Convex and Switch transforms.
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*
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* @author Karl Helgason
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*/
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public final class ModelStandardTransform implements ModelTransform {
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public static final boolean DIRECTION_MIN2MAX = false;
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public static final boolean DIRECTION_MAX2MIN = true;
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public static final boolean POLARITY_UNIPOLAR = false;
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public static final boolean POLARITY_BIPOLAR = true;
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public static final int TRANSFORM_LINEAR = 0;
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// concave: output = (20*log10(127^2/value^2)) / 96
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public static final int TRANSFORM_CONCAVE = 1;
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// convex: same as concave except that start and end point are reversed.
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public static final int TRANSFORM_CONVEX = 2;
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// switch: if value > avg(max,min) then max else min
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public static final int TRANSFORM_SWITCH = 3;
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public static final int TRANSFORM_ABSOLUTE = 4;
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private boolean direction = DIRECTION_MIN2MAX;
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private boolean polarity = POLARITY_UNIPOLAR;
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private int transform = TRANSFORM_LINEAR;
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public ModelStandardTransform() {
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}
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public ModelStandardTransform(boolean direction) {
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this.direction = direction;
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}
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public ModelStandardTransform(boolean direction, boolean polarity) {
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this.direction = direction;
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this.polarity = polarity;
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}
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public ModelStandardTransform(boolean direction, boolean polarity,
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int transform) {
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this.direction = direction;
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this.polarity = polarity;
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this.transform = transform;
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}
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public double transform(double value) {
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double s;
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double a;
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if (direction == DIRECTION_MAX2MIN)
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value = 1.0 - value;
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if (polarity == POLARITY_BIPOLAR)
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value = value * 2.0 - 1.0;
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switch (transform) {
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case TRANSFORM_CONCAVE:
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s = Math.signum(value);
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a = Math.abs(value);
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a = -((5.0 / 12.0) / Math.log(10)) * Math.log(1.0 - a);
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if (a < 0)
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a = 0;
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else if (a > 1)
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a = 1;
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return s * a;
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case TRANSFORM_CONVEX:
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s = Math.signum(value);
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a = Math.abs(value);
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a = 1.0 + ((5.0 / 12.0) / Math.log(10)) * Math.log(a);
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if (a < 0)
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a = 0;
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else if (a > 1)
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a = 1;
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return s * a;
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case TRANSFORM_SWITCH:
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if (polarity == POLARITY_BIPOLAR)
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return (value > 0) ? 1 : -1;
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else
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return (value > 0.5) ? 1 : 0;
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case TRANSFORM_ABSOLUTE:
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return Math.abs(value);
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default:
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break;
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}
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return value;
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}
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public boolean getDirection() {
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return direction;
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}
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public void setDirection(boolean direction) {
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this.direction = direction;
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}
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public boolean getPolarity() {
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return polarity;
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}
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public void setPolarity(boolean polarity) {
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this.polarity = polarity;
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}
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public int getTransform() {
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return transform;
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}
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public void setTransform(int transform) {
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this.transform = transform;
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}
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}
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