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 reset()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 init(SoftSynthesizer synth)86 public void init(SoftSynthesizer synth) { 87 control_time = 1.0 / synth.getControlRate(); 88 processControlLogic(); 89 } 90 91 @Override get(int instance, String name)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") processControlLogic()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 } 305