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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
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* 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.
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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 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;
}
}