| /* |
| * Copyright (c) 2007, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * 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. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * 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 (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package com.sun.media.sound; |
| |
| /** |
| * A standard transformer used in connection blocks. |
| * It expects input values to be between 0 and 1. |
| * |
| * The result of the transform is |
| * between 0 and 1 if polarity = unipolar and |
| * between -1 and 1 if polarity = bipolar. |
| * |
| * These constraints only applies to Concave, Convex and Switch transforms. |
| * |
| * @author Karl Helgason |
| */ |
| public final class ModelStandardTransform implements ModelTransform { |
| |
| public static final boolean DIRECTION_MIN2MAX = false; |
| public static final boolean DIRECTION_MAX2MIN = true; |
| public static final boolean POLARITY_UNIPOLAR = false; |
| public static final boolean POLARITY_BIPOLAR = true; |
| public static final int TRANSFORM_LINEAR = 0; |
| // concave: output = (20*log10(127^2/value^2)) / 96 |
| public static final int TRANSFORM_CONCAVE = 1; |
| // convex: same as concave except that start and end point are reversed. |
| public static final int TRANSFORM_CONVEX = 2; |
| // switch: if value > avg(max,min) then max else min |
| public static final int TRANSFORM_SWITCH = 3; |
| public static final int TRANSFORM_ABSOLUTE = 4; |
| private boolean direction = DIRECTION_MIN2MAX; |
| private boolean polarity = POLARITY_UNIPOLAR; |
| private int transform = TRANSFORM_LINEAR; |
| |
| public ModelStandardTransform() { |
| } |
| |
| public ModelStandardTransform(boolean direction) { |
| this.direction = direction; |
| } |
| |
| public ModelStandardTransform(boolean direction, boolean polarity) { |
| this.direction = direction; |
| this.polarity = polarity; |
| } |
| |
| public ModelStandardTransform(boolean direction, boolean polarity, |
| int transform) { |
| this.direction = direction; |
| this.polarity = polarity; |
| this.transform = transform; |
| } |
| |
| public double transform(double value) { |
| double s; |
| double a; |
| if (direction == DIRECTION_MAX2MIN) |
| value = 1.0 - value; |
| if (polarity == POLARITY_BIPOLAR) |
| value = value * 2.0 - 1.0; |
| switch (transform) { |
| case TRANSFORM_CONCAVE: |
| s = Math.signum(value); |
| a = Math.abs(value); |
| a = -((5.0 / 12.0) / Math.log(10)) * Math.log(1.0 - a); |
| if (a < 0) |
| a = 0; |
| else if (a > 1) |
| a = 1; |
| return s * a; |
| case TRANSFORM_CONVEX: |
| s = Math.signum(value); |
| a = Math.abs(value); |
| a = 1.0 + ((5.0 / 12.0) / Math.log(10)) * Math.log(a); |
| if (a < 0) |
| a = 0; |
| else if (a > 1) |
| a = 1; |
| return s * a; |
| case TRANSFORM_SWITCH: |
| if (polarity == POLARITY_BIPOLAR) |
| return (value > 0) ? 1 : -1; |
| else |
| return (value > 0.5) ? 1 : 0; |
| case TRANSFORM_ABSOLUTE: |
| return Math.abs(value); |
| default: |
| break; |
| } |
| |
| return value; |
| } |
| |
| public boolean getDirection() { |
| return direction; |
| } |
| |
| public void setDirection(boolean direction) { |
| this.direction = direction; |
| } |
| |
| public boolean getPolarity() { |
| return polarity; |
| } |
| |
| public void setPolarity(boolean polarity) { |
| this.polarity = polarity; |
| } |
| |
| public int getTransform() { |
| return transform; |
| } |
| |
| public void setTransform(int transform) { |
| this.transform = transform; |
| } |
| } |