1 /*
2 * Copyright (c) 2007, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package com.sun.media.sound;
27
28 /**
29 * AHDSR control signal envelope generator.
30 *
31 * @author Karl Helgason
32 */
33 public final class SoftEnvelopeGenerator implements SoftProcess {
34
35 public static final int EG_OFF = 0;
36 public static final int EG_DELAY = 1;
37 public static final int EG_ATTACK = 2;
38 public static final int EG_HOLD = 3;
39 public static final int EG_DECAY = 4;
40 public static final int EG_SUSTAIN = 5;
41 public static final int EG_RELEASE = 6;
42 public static final int EG_SHUTDOWN = 7;
43 public static final int EG_END = 8;
44 int max_count = 10;
45 int used_count = 0;
46 private final int[] stage = new int[max_count];
47 private final int[] stage_ix = new int[max_count];
48 private final double[] stage_v = new double[max_count];
49 private final int[] stage_count = new int[max_count];
50 private final double[][] on = new double[max_count][1];
51 private final double[][] active = new double[max_count][1];
52 private final double[][] out = new double[max_count][1];
53 private final double[][] delay = new double[max_count][1];
54 private final double[][] attack = new double[max_count][1];
55 private final double[][] hold = new double[max_count][1];
56 private final double[][] decay = new double[max_count][1];
57 private final double[][] sustain = new double[max_count][1];
58 private final double[][] release = new double[max_count][1];
59 private final double[][] shutdown = new double[max_count][1];
60 private final double[][] release2 = new double[max_count][1];
61 private final double[][] attack2 = new double[max_count][1];
62 private final double[][] decay2 = new double[max_count][1];
63 private double control_time = 0;
64
65 @Override
66 public void reset() {
67 for (int i = 0; i < used_count; i++) {
68 stage[i] = 0;
69 on[i][0] = 0;
70 out[i][0] = 0;
71 delay[i][0] = 0;
72 attack[i][0] = 0;
73 hold[i][0] = 0;
74 decay[i][0] = 0;
75 sustain[i][0] = 0;
76 release[i][0] = 0;
77 shutdown[i][0] = 0;
78 attack2[i][0] = 0;
79 decay2[i][0] = 0;
80 release2[i][0] = 0;
81 }
82 used_count = 0;
83 }
84
85 @Override
86 public void init(SoftSynthesizer synth) {
87 control_time = 1.0 / synth.getControlRate();
88 processControlLogic();
89 }
90
91 @Override
92 public double[] get(int instance, String name) {
93 if (instance >= used_count)
94 used_count = instance + 1;
95 if (name == null)
96 return out[instance];
97 if (name.equals("on"))
98 return on[instance];
99 if (name.equals("active"))
100 return active[instance];
101 if (name.equals("delay"))
102 return delay[instance];
103 if (name.equals("attack"))
104 return attack[instance];
105 if (name.equals("hold"))
106 return hold[instance];
107 if (name.equals("decay"))
108 return decay[instance];
109 if (name.equals("sustain"))
110 return sustain[instance];
111 if (name.equals("release"))
112 return release[instance];
113 if (name.equals("shutdown"))
114 return shutdown[instance];
115 if (name.equals("attack2"))
116 return attack2[instance];
117 if (name.equals("decay2"))
118 return decay2[instance];
119 if (name.equals("release2"))
120 return release2[instance];
121
122 return null;
123 }
124
125 @Override
126 @SuppressWarnings("fallthrough")
127 public void processControlLogic() {
128 for (int i = 0; i < used_count; i++) {
129
130 if (stage[i] == EG_END)
131 continue;
132
133 if ((stage[i] > EG_OFF) && (stage[i] < EG_RELEASE)) {
134 if (on[i][0] < 0.5) {
135 if (on[i][0] < -0.5) {
136 stage_count[i] = (int)(Math.pow(2,
137 this.shutdown[i][0] / 1200.0) / control_time);
138 if (stage_count[i] < 0)
139 stage_count[i] = 0;
140 stage_v[i] = out[i][0];
141 stage_ix[i] = 0;
142 stage[i] = EG_SHUTDOWN;
143 } else {
144 if ((release2[i][0] < 0.000001) && release[i][0] < 0
145 && Double.isInfinite(release[i][0])) {
146 out[i][0] = 0;
147 active[i][0] = 0;
148 stage[i] = EG_END;
149 continue;
150 }
151
152 stage_count[i] = (int)(Math.pow(2,
153 this.release[i][0] / 1200.0) / control_time);
154 stage_count[i]
155 += (int)(this.release2[i][0]/(control_time * 1000));
156 if (stage_count[i] < 0)
157 stage_count[i] = 0;
158 // stage_v[i] = out[i][0];
159 stage_ix[i] = 0;
160
161 double m = 1 - out[i][0];
162 stage_ix[i] = (int)(stage_count[i] * m);
163
164 stage[i] = EG_RELEASE;
165 }
166 }
167 }
168
169 switch (stage[i]) {
170 case EG_OFF:
171 active[i][0] = 1;
172 if (on[i][0] < 0.5)
173 break;
174 stage[i] = EG_DELAY;
175 stage_ix[i] = (int)(Math.pow(2,
176 this.delay[i][0] / 1200.0) / control_time);
177 if (stage_ix[i] < 0)
178 stage_ix[i] = 0;
179 // Fallthrough
180 case EG_DELAY:
181 if (stage_ix[i] == 0) {
182 double attack = this.attack[i][0];
183 double attack2 = this.attack2[i][0];
184
185 if (attack2 < 0.000001
186 && (attack < 0 && Double.isInfinite(attack))) {
187 out[i][0] = 1;
188 stage[i] = EG_HOLD;
189 stage_count[i] = (int)(Math.pow(2,
190 this.hold[i][0] / 1200.0) / control_time);
191 stage_ix[i] = 0;
192 } else {
193 stage[i] = EG_ATTACK;
194 stage_count[i] = (int)(Math.pow(2,
195 attack / 1200.0) / control_time);
196 stage_count[i] += (int)(attack2 / (control_time * 1000));
197 if (stage_count[i] < 0)
198 stage_count[i] = 0;
199 stage_ix[i] = 0;
200 }
201 } else
202 stage_ix[i]--;
203 break;
204 case EG_ATTACK:
205 stage_ix[i]++;
206 if (stage_ix[i] >= stage_count[i]) {
207 out[i][0] = 1;
208 stage[i] = EG_HOLD;
209 } else {
210 // CONVEX attack
211 double a = ((double)stage_ix[i]) / ((double)stage_count[i]);
212 a = 1 + ((40.0 / 96.0) / Math.log(10)) * Math.log(a);
213 if (a < 0)
214 a = 0;
215 else if (a > 1)
216 a = 1;
217 out[i][0] = a;
218 }
219 break;
220 case EG_HOLD:
221 stage_ix[i]++;
222 if (stage_ix[i] >= stage_count[i]) {
223 stage[i] = EG_DECAY;
224 stage_count[i] = (int)(Math.pow(2,
225 this.decay[i][0] / 1200.0) / control_time);
226 stage_count[i] += (int)(this.decay2[i][0]/(control_time*1000));
227 if (stage_count[i] < 0)
228 stage_count[i] = 0;
229 stage_ix[i] = 0;
230 }
231 break;
232 case EG_DECAY:
233 stage_ix[i]++;
234 double sustain = this.sustain[i][0] * (1.0 / 1000.0);
235 if (stage_ix[i] >= stage_count[i]) {
236 out[i][0] = sustain;
237 stage[i] = EG_SUSTAIN;
238 if (sustain < 0.001) {
239 out[i][0] = 0;
240 active[i][0] = 0;
241 stage[i] = EG_END;
242 }
243 } else {
244 double m = ((double)stage_ix[i]) / ((double)stage_count[i]);
245 out[i][0] = (1 - m) + sustain * m;
246 }
247 break;
248 case EG_SUSTAIN:
249 break;
250 case EG_RELEASE:
251 stage_ix[i]++;
252 if (stage_ix[i] >= stage_count[i]) {
253 out[i][0] = 0;
254 active[i][0] = 0;
255 stage[i] = EG_END;
256 } else {
257 double m = ((double)stage_ix[i]) / ((double)stage_count[i]);
258 out[i][0] = (1 - m); // *stage_v[i];
259
260 if (on[i][0] < -0.5) {
261 stage_count[i] = (int)(Math.pow(2,
262 this.shutdown[i][0] / 1200.0) / control_time);
263 if (stage_count[i] < 0)
264 stage_count[i] = 0;
265 stage_v[i] = out[i][0];
266 stage_ix[i] = 0;
267 stage[i] = EG_SHUTDOWN;
268 }
269
270 // re-damping
271 if (on[i][0] > 0.5) {
272 sustain = this.sustain[i][0] * (1.0 / 1000.0);
273 if (out[i][0] > sustain) {
274 stage[i] = EG_DECAY;
275 stage_count[i] = (int)(Math.pow(2,
276 this.decay[i][0] / 1200.0) / control_time);
277 stage_count[i] +=
278 (int)(this.decay2[i][0]/(control_time*1000));
279 if (stage_count[i] < 0)
280 stage_count[i] = 0;
281 m = (out[i][0] - 1) / (sustain - 1);
282 stage_ix[i] = (int) (stage_count[i] * m);
283 }
284 }
285
286 }
287 break;
288 case EG_SHUTDOWN:
289 stage_ix[i]++;
290 if (stage_ix[i] >= stage_count[i]) {
291 out[i][0] = 0;
292 active[i][0] = 0;
293 stage[i] = EG_END;
294 } else {
295 double m = ((double)stage_ix[i]) / ((double)stage_count[i]);
296 out[i][0] = (1 - m) * stage_v[i];
297 }
298 break;
299 default:
300 break;
301 }
302 }
303 }
304 }