Java example source code file (SoftEnvelopeGenerator.java)
The SoftEnvelopeGenerator.java Java example source code
/*
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* 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.
*
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package com.sun.media.sound;
/**
* AHDSR control signal envelope generator.
*
* @author Karl Helgason
*/
public final class SoftEnvelopeGenerator implements SoftProcess {
public final static int EG_OFF = 0;
public final static int EG_DELAY = 1;
public final static int EG_ATTACK = 2;
public final static int EG_HOLD = 3;
public final static int EG_DECAY = 4;
public final static int EG_SUSTAIN = 5;
public final static int EG_RELEASE = 6;
public final static int EG_SHUTDOWN = 7;
public final static int EG_END = 8;
int max_count = 10;
int used_count = 0;
private final int[] stage = new int[max_count];
private final int[] stage_ix = new int[max_count];
private final double[] stage_v = new double[max_count];
private final int[] stage_count = new int[max_count];
private final double[][] on = new double[max_count][1];
private final double[][] active = new double[max_count][1];
private final double[][] out = new double[max_count][1];
private final double[][] delay = new double[max_count][1];
private final double[][] attack = new double[max_count][1];
private final double[][] hold = new double[max_count][1];
private final double[][] decay = new double[max_count][1];
private final double[][] sustain = new double[max_count][1];
private final double[][] release = new double[max_count][1];
private final double[][] shutdown = new double[max_count][1];
private final double[][] release2 = new double[max_count][1];
private final double[][] attack2 = new double[max_count][1];
private final double[][] decay2 = new double[max_count][1];
private double control_time = 0;
public void reset() {
for (int i = 0; i < used_count; i++) {
stage[i] = 0;
on[i][0] = 0;
out[i][0] = 0;
delay[i][0] = 0;
attack[i][0] = 0;
hold[i][0] = 0;
decay[i][0] = 0;
sustain[i][0] = 0;
release[i][0] = 0;
shutdown[i][0] = 0;
attack2[i][0] = 0;
decay2[i][0] = 0;
release2[i][0] = 0;
}
used_count = 0;
}
public void init(SoftSynthesizer synth) {
control_time = 1.0 / synth.getControlRate();
processControlLogic();
}
public double[] get(int instance, String name) {
if (instance >= used_count)
used_count = instance + 1;
if (name == null)
return out[instance];
if (name.equals("on"))
return on[instance];
if (name.equals("active"))
return active[instance];
if (name.equals("delay"))
return delay[instance];
if (name.equals("attack"))
return attack[instance];
if (name.equals("hold"))
return hold[instance];
if (name.equals("decay"))
return decay[instance];
if (name.equals("sustain"))
return sustain[instance];
if (name.equals("release"))
return release[instance];
if (name.equals("shutdown"))
return shutdown[instance];
if (name.equals("attack2"))
return attack2[instance];
if (name.equals("decay2"))
return decay2[instance];
if (name.equals("release2"))
return release2[instance];
return null;
}
public void processControlLogic() {
for (int i = 0; i < used_count; i++) {
if (stage[i] == EG_END)
continue;
if ((stage[i] > EG_OFF) && (stage[i] < EG_RELEASE)) {
if (on[i][0] < 0.5) {
if (on[i][0] < -0.5) {
stage_count[i] = (int)(Math.pow(2,
this.shutdown[i][0] / 1200.0) / control_time);
if (stage_count[i] < 0)
stage_count[i] = 0;
stage_v[i] = out[i][0];
stage_ix[i] = 0;
stage[i] = EG_SHUTDOWN;
} else {
if ((release2[i][0] < 0.000001) && release[i][0] < 0
&& Double.isInfinite(release[i][0])) {
out[i][0] = 0;
active[i][0] = 0;
stage[i] = EG_END;
continue;
}
stage_count[i] = (int)(Math.pow(2,
this.release[i][0] / 1200.0) / control_time);
stage_count[i]
+= (int)(this.release2[i][0]/(control_time * 1000));
if (stage_count[i] < 0)
stage_count[i] = 0;
// stage_v[i] = out[i][0];
stage_ix[i] = 0;
double m = 1 - out[i][0];
stage_ix[i] = (int)(stage_count[i] * m);
stage[i] = EG_RELEASE;
}
}
}
switch (stage[i]) {
case EG_OFF:
active[i][0] = 1;
if (on[i][0] < 0.5)
break;
stage[i] = EG_DELAY;
stage_ix[i] = (int)(Math.pow(2,
this.delay[i][0] / 1200.0) / control_time);
if (stage_ix[i] < 0)
stage_ix[i] = 0;
case EG_DELAY:
if (stage_ix[i] == 0) {
double attack = this.attack[i][0];
double attack2 = this.attack2[i][0];
if (attack2 < 0.000001
&& (attack < 0 && Double.isInfinite(attack))) {
out[i][0] = 1;
stage[i] = EG_HOLD;
stage_count[i] = (int)(Math.pow(2,
this.hold[i][0] / 1200.0) / control_time);
stage_ix[i] = 0;
} else {
stage[i] = EG_ATTACK;
stage_count[i] = (int)(Math.pow(2,
attack / 1200.0) / control_time);
stage_count[i] += (int)(attack2 / (control_time * 1000));
if (stage_count[i] < 0)
stage_count[i] = 0;
stage_ix[i] = 0;
}
} else
stage_ix[i]--;
break;
case EG_ATTACK:
stage_ix[i]++;
if (stage_ix[i] >= stage_count[i]) {
out[i][0] = 1;
stage[i] = EG_HOLD;
} else {
// CONVEX attack
double a = ((double)stage_ix[i]) / ((double)stage_count[i]);
a = 1 + ((40.0 / 96.0) / Math.log(10)) * Math.log(a);
if (a < 0)
a = 0;
else if (a > 1)
a = 1;
out[i][0] = a;
}
break;
case EG_HOLD:
stage_ix[i]++;
if (stage_ix[i] >= stage_count[i]) {
stage[i] = EG_DECAY;
stage_count[i] = (int)(Math.pow(2,
this.decay[i][0] / 1200.0) / control_time);
stage_count[i] += (int)(this.decay2[i][0]/(control_time*1000));
if (stage_count[i] < 0)
stage_count[i] = 0;
stage_ix[i] = 0;
}
break;
case EG_DECAY:
stage_ix[i]++;
double sustain = this.sustain[i][0] * (1.0 / 1000.0);
if (stage_ix[i] >= stage_count[i]) {
out[i][0] = sustain;
stage[i] = EG_SUSTAIN;
if (sustain < 0.001) {
out[i][0] = 0;
active[i][0] = 0;
stage[i] = EG_END;
}
} else {
double m = ((double)stage_ix[i]) / ((double)stage_count[i]);
out[i][0] = (1 - m) + sustain * m;
}
break;
case EG_SUSTAIN:
break;
case EG_RELEASE:
stage_ix[i]++;
if (stage_ix[i] >= stage_count[i]) {
out[i][0] = 0;
active[i][0] = 0;
stage[i] = EG_END;
} else {
double m = ((double)stage_ix[i]) / ((double)stage_count[i]);
out[i][0] = (1 - m); // *stage_v[i];
if (on[i][0] < -0.5) {
stage_count[i] = (int)(Math.pow(2,
this.shutdown[i][0] / 1200.0) / control_time);
if (stage_count[i] < 0)
stage_count[i] = 0;
stage_v[i] = out[i][0];
stage_ix[i] = 0;
stage[i] = EG_SHUTDOWN;
}
// re-damping
if (on[i][0] > 0.5) {
sustain = this.sustain[i][0] * (1.0 / 1000.0);
if (out[i][0] > sustain) {
stage[i] = EG_DECAY;
stage_count[i] = (int)(Math.pow(2,
this.decay[i][0] / 1200.0) / control_time);
stage_count[i] +=
(int)(this.decay2[i][0]/(control_time*1000));
if (stage_count[i] < 0)
stage_count[i] = 0;
m = (out[i][0] - 1) / (sustain - 1);
stage_ix[i] = (int) (stage_count[i] * m);
}
}
}
break;
case EG_SHUTDOWN:
stage_ix[i]++;
if (stage_ix[i] >= stage_count[i]) {
out[i][0] = 0;
active[i][0] = 0;
stage[i] = EG_END;
} else {
double m = ((double)stage_ix[i]) / ((double)stage_count[i]);
out[i][0] = (1 - m) * stage_v[i];
}
break;
default:
break;
}
}
}
}
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