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 package com.sun.media.sound;
26
27 /**
28 * AHDSR control signal envelope generator.
29 *
30 * @author Karl Helgason
31 */
32 public final class SoftEnvelopeGenerator implements SoftProcess {
33
34 public static final int EG_OFF = 0;
35 public static final int EG_DELAY = 1;
36 public static final int EG_ATTACK = 2;
37 public static final int EG_HOLD = 3;
38 public static final int EG_DECAY = 4;
39 public static final int EG_SUSTAIN = 5;
40 public static final int EG_RELEASE = 6;
41 public static final int EG_SHUTDOWN = 7;
42 public static final int EG_END = 8;
43 int max_count = 10;
44 int used_count = 0;
45 private final int[] stage = new int[max_count];
46 private final int[] stage_ix = new int[max_count];
47 private final double[] stage_v = new double[max_count];
48 private final int[] stage_count = new int[max_count];
49 private final double[][] on = new double[max_count][1];
50 private final double[][] active = new double[max_count][1];
51 private final double[][] out = new double[max_count][1];
52 private final double[][] delay = new double[max_count][1];
53 private final double[][] attack = new double[max_count][1];
54 private final double[][] hold = new double[max_count][1];
55 private final double[][] decay = new double[max_count][1];
56 private final double[][] sustain = new double[max_count][1];
57 private final double[][] release = new double[max_count][1];
58 private final double[][] shutdown = new double[max_count][1];
59 private final double[][] release2 = new double[max_count][1];
60 private final double[][] attack2 = new double[max_count][1];
61 private final double[][] decay2 = new double[max_count][1];
62 private double control_time = 0;
63
64 public void reset() {
65 for (int i = 0; i < used_count; i++) {
66 stage[i] = 0;
67 on[i][0] = 0;
68 out[i][0] = 0;
69 delay[i][0] = 0;
70 attack[i][0] = 0;
71 hold[i][0] = 0;
72 decay[i][0] = 0;
73 sustain[i][0] = 0;
74 release[i][0] = 0;
75 shutdown[i][0] = 0;
76 attack2[i][0] = 0;
77 decay2[i][0] = 0;
78 release2[i][0] = 0;
79 }
80 used_count = 0;
81 }
82
83 public void init(SoftSynthesizer synth) {
84 control_time = 1.0 / synth.getControlRate();
85 processControlLogic();
86 }
87
88 public double[] get(int instance, String name) {
89 if (instance >= used_count)
90 used_count = instance + 1;
91 if (name == null)
92 return out[instance];
93 if (name.equals("on"))
94 return on[instance];
95 if (name.equals("active"))
96 return active[instance];
97 if (name.equals("delay"))
98 return delay[instance];
99 if (name.equals("attack"))
100 return attack[instance];
101 if (name.equals("hold"))
102 return hold[instance];
103 if (name.equals("decay"))
104 return decay[instance];
105 if (name.equals("sustain"))
106 return sustain[instance];
107 if (name.equals("release"))
108 return release[instance];
109 if (name.equals("shutdown"))
110 return shutdown[instance];
111 if (name.equals("attack2"))
112 return attack2[instance];
113 if (name.equals("decay2"))
114 return decay2[instance];
115 if (name.equals("release2"))
116 return release2[instance];
117
118 return null;
119 }
120
121 @SuppressWarnings("fallthrough")
122 public void processControlLogic() {
123 for (int i = 0; i < used_count; i++) {
124
125 if (stage[i] == EG_END)
126 continue;
127
128 if ((stage[i] > EG_OFF) && (stage[i] < EG_RELEASE)) {
129 if (on[i][0] < 0.5) {
130 if (on[i][0] < -0.5) {
131 stage_count[i] = (int)(Math.pow(2,
132 this.shutdown[i][0] / 1200.0) / control_time);
133 if (stage_count[i] < 0)
134 stage_count[i] = 0;
135 stage_v[i] = out[i][0];
136 stage_ix[i] = 0;
137 stage[i] = EG_SHUTDOWN;
138 } else {
139 if ((release2[i][0] < 0.000001) && release[i][0] < 0
140 && Double.isInfinite(release[i][0])) {
141 out[i][0] = 0;
142 active[i][0] = 0;
143 stage[i] = EG_END;
144 continue;
145 }
146
147 stage_count[i] = (int)(Math.pow(2,
148 this.release[i][0] / 1200.0) / control_time);
149 stage_count[i]
150 += (int)(this.release2[i][0]/(control_time * 1000));
151 if (stage_count[i] < 0)
152 stage_count[i] = 0;
153 // stage_v[i] = out[i][0];
154 stage_ix[i] = 0;
155
156 double m = 1 - out[i][0];
157 stage_ix[i] = (int)(stage_count[i] * m);
158
159 stage[i] = EG_RELEASE;
160 }
161 }
162 }
163
164 switch (stage[i]) {
165 case EG_OFF:
166 active[i][0] = 1;
167 if (on[i][0] < 0.5)
168 break;
169 stage[i] = EG_DELAY;
170 stage_ix[i] = (int)(Math.pow(2,
171 this.delay[i][0] / 1200.0) / control_time);
172 if (stage_ix[i] < 0)
173 stage_ix[i] = 0;
174 // Fallthrough
175 case EG_DELAY:
176 if (stage_ix[i] == 0) {
177 double attack = this.attack[i][0];
178 double attack2 = this.attack2[i][0];
179
180 if (attack2 < 0.000001
181 && (attack < 0 && Double.isInfinite(attack))) {
182 out[i][0] = 1;
183 stage[i] = EG_HOLD;
184 stage_count[i] = (int)(Math.pow(2,
185 this.hold[i][0] / 1200.0) / control_time);
186 stage_ix[i] = 0;
187 } else {
188 stage[i] = EG_ATTACK;
189 stage_count[i] = (int)(Math.pow(2,
190 attack / 1200.0) / control_time);
191 stage_count[i] += (int)(attack2 / (control_time * 1000));
192 if (stage_count[i] < 0)
193 stage_count[i] = 0;
194 stage_ix[i] = 0;
195 }
196 } else
197 stage_ix[i]--;
198 break;
199 case EG_ATTACK:
200 stage_ix[i]++;
201 if (stage_ix[i] >= stage_count[i]) {
202 out[i][0] = 1;
203 stage[i] = EG_HOLD;
204 } else {
205 // CONVEX attack
206 double a = ((double)stage_ix[i]) / ((double)stage_count[i]);
207 a = 1 + ((40.0 / 96.0) / Math.log(10)) * Math.log(a);
208 if (a < 0)
209 a = 0;
210 else if (a > 1)
211 a = 1;
212 out[i][0] = a;
213 }
214 break;
215 case EG_HOLD:
216 stage_ix[i]++;
217 if (stage_ix[i] >= stage_count[i]) {
218 stage[i] = EG_DECAY;
219 stage_count[i] = (int)(Math.pow(2,
220 this.decay[i][0] / 1200.0) / control_time);
221 stage_count[i] += (int)(this.decay2[i][0]/(control_time*1000));
222 if (stage_count[i] < 0)
223 stage_count[i] = 0;
224 stage_ix[i] = 0;
225 }
226 break;
227 case EG_DECAY:
228 stage_ix[i]++;
229 double sustain = this.sustain[i][0] * (1.0 / 1000.0);
230 if (stage_ix[i] >= stage_count[i]) {
231 out[i][0] = sustain;
232 stage[i] = EG_SUSTAIN;
233 if (sustain < 0.001) {
234 out[i][0] = 0;
235 active[i][0] = 0;
236 stage[i] = EG_END;
237 }
238 } else {
239 double m = ((double)stage_ix[i]) / ((double)stage_count[i]);
240 out[i][0] = (1 - m) + sustain * m;
241 }
242 break;
243 case EG_SUSTAIN:
244 break;
245 case EG_RELEASE:
246 stage_ix[i]++;
247 if (stage_ix[i] >= stage_count[i]) {
248 out[i][0] = 0;
249 active[i][0] = 0;
250 stage[i] = EG_END;
251 } else {
252 double m = ((double)stage_ix[i]) / ((double)stage_count[i]);
253 out[i][0] = (1 - m); // *stage_v[i];
254
255 if (on[i][0] < -0.5) {
256 stage_count[i] = (int)(Math.pow(2,
257 this.shutdown[i][0] / 1200.0) / control_time);
258 if (stage_count[i] < 0)
259 stage_count[i] = 0;
260 stage_v[i] = out[i][0];
261 stage_ix[i] = 0;
262 stage[i] = EG_SHUTDOWN;
263 }
264
265 // re-damping
266 if (on[i][0] > 0.5) {
267 sustain = this.sustain[i][0] * (1.0 / 1000.0);
268 if (out[i][0] > sustain) {
269 stage[i] = EG_DECAY;
270 stage_count[i] = (int)(Math.pow(2,
271 this.decay[i][0] / 1200.0) / control_time);
272 stage_count[i] +=
273 (int)(this.decay2[i][0]/(control_time*1000));
274 if (stage_count[i] < 0)
275 stage_count[i] = 0;
276 m = (out[i][0] - 1) / (sustain - 1);
277 stage_ix[i] = (int) (stage_count[i] * m);
278 }
279 }
280
281 }
282 break;
283 case EG_SHUTDOWN:
284 stage_ix[i]++;
285 if (stage_ix[i] >= stage_count[i]) {
286 out[i][0] = 0;
287 active[i][0] = 0;
288 stage[i] = EG_END;
289 } else {
290 double m = ((double)stage_ix[i]) / ((double)stage_count[i]);
291 out[i][0] = (1 - m) * stage_v[i];
292 }
293 break;
294 default:
295 break;
296 }
297 }
298
299 }
300 }