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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 | /* * Copyright (c) Eicon Networks, 2002. * This source file is supplied for the use with Eicon Networks range of DIVA Server Adapters. * Eicon File Revision : 2.1 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY OF ANY KIND WHATSOEVER INCLUDING ANY implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. * You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * */ #include "platform.h" #include "capidtmf.h" /* #define TRACE_ */ #define FILE_ "CAPIDTMF.C" /*---------------------------------------------------------------------------*/ #define trace(a) /*---------------------------------------------------------------------------*/ static short capidtmf_expand_table_alaw[0x0100] = { -5504, 5504, -344, 344, -22016, 22016, -1376, 1376, -2752, 2752, -88, 88, -11008, 11008, -688, 688, -7552, 7552, -472, 472, -30208, 30208, -1888, 1888, -3776, 3776, -216, 216, -15104, 15104, -944, 944, -4480, 4480, -280, 280, -17920, 17920, -1120, 1120, -2240, 2240, -24, 24, -8960, 8960, -560, 560, -6528, 6528, -408, 408, -26112, 26112, -1632, 1632, -3264, 3264, -152, 152, -13056, 13056, -816, 816, -6016, 6016, -376, 376, -24064, 24064, -1504, 1504, -3008, 3008, -120, 120, -12032, 12032, -752, 752, -8064, 8064, -504, 504, -32256, 32256, -2016, 2016, -4032, 4032, -248, 248, -16128, 16128, -1008, 1008, -4992, 4992, -312, 312, -19968, 19968, -1248, 1248, -2496, 2496, -56, 56, -9984, 9984, -624, 624, -7040, 7040, -440, 440, -28160, 28160, -1760, 1760, -3520, 3520, -184, 184, -14080, 14080, -880, 880, -5248, 5248, -328, 328, -20992, 20992, -1312, 1312, -2624, 2624, -72, 72, -10496, 10496, -656, 656, -7296, 7296, -456, 456, -29184, 29184, -1824, 1824, -3648, 3648, -200, 200, -14592, 14592, -912, 912, -4224, 4224, -264, 264, -16896, 16896, -1056, 1056, -2112, 2112, -8, 8, -8448, 8448, -528, 528, -6272, 6272, -392, 392, -25088, 25088, -1568, 1568, -3136, 3136, -136, 136, -12544, 12544, -784, 784, -5760, 5760, -360, 360, -23040, 23040, -1440, 1440, -2880, 2880, -104, 104, -11520, 11520, -720, 720, -7808, 7808, -488, 488, -31232, 31232, -1952, 1952, -3904, 3904, -232, 232, -15616, 15616, -976, 976, -4736, 4736, -296, 296, -18944, 18944, -1184, 1184, -2368, 2368, -40, 40, -9472, 9472, -592, 592, -6784, 6784, -424, 424, -27136, 27136, -1696, 1696, -3392, 3392, -168, 168, -13568, 13568, -848, 848 }; static short capidtmf_expand_table_ulaw[0x0100] = { -32124, 32124, -1884, 1884, -7932, 7932, -372, 372, -15996, 15996, -876, 876, -3900, 3900, -120, 120, -23932, 23932, -1372, 1372, -5884, 5884, -244, 244, -11900, 11900, -620, 620, -2876, 2876, -56, 56, -28028, 28028, -1628, 1628, -6908, 6908, -308, 308, -13948, 13948, -748, 748, -3388, 3388, -88, 88, -19836, 19836, -1116, 1116, -4860, 4860, -180, 180, -9852, 9852, -492, 492, -2364, 2364, -24, 24, -30076, 30076, -1756, 1756, -7420, 7420, -340, 340, -14972, 14972, -812, 812, -3644, 3644, -104, 104, -21884, 21884, -1244, 1244, -5372, 5372, -212, 212, -10876, 10876, -556, 556, -2620, 2620, -40, 40, -25980, 25980, -1500, 1500, -6396, 6396, -276, 276, -12924, 12924, -684, 684, -3132, 3132, -72, 72, -17788, 17788, -988, 988, -4348, 4348, -148, 148, -8828, 8828, -428, 428, -2108, 2108, -8, 8, -31100, 31100, -1820, 1820, -7676, 7676, -356, 356, -15484, 15484, -844, 844, -3772, 3772, -112, 112, -22908, 22908, -1308, 1308, -5628, 5628, -228, 228, -11388, 11388, -588, 588, -2748, 2748, -48, 48, -27004, 27004, -1564, 1564, -6652, 6652, -292, 292, -13436, 13436, -716, 716, -3260, 3260, -80, 80, -18812, 18812, -1052, 1052, -4604, 4604, -164, 164, -9340, 9340, -460, 460, -2236, 2236, -16, 16, -29052, 29052, -1692, 1692, -7164, 7164, -324, 324, -14460, 14460, -780, 780, -3516, 3516, -96, 96, -20860, 20860, -1180, 1180, -5116, 5116, -196, 196, -10364, 10364, -524, 524, -2492, 2492, -32, 32, -24956, 24956, -1436, 1436, -6140, 6140, -260, 260, -12412, 12412, -652, 652, -3004, 3004, -64, 64, -16764, 16764, -924, 924, -4092, 4092, -132, 132, -8316, 8316, -396, 396, -1980, 1980, 0, 0 }; /*---------------------------------------------------------------------------*/ static short capidtmf_recv_window_function[CAPIDTMF_RECV_ACCUMULATE_CYCLES] = { -500L, -999L, -1499L, -1998L, -2496L, -2994L, -3491L, -3988L, -4483L, -4978L, -5471L, -5963L, -6454L, -6943L, -7431L, -7917L, -8401L, -8883L, -9363L, -9840L, -10316L, -10789L, -11259L, -11727L, -12193L, -12655L, -13115L, -13571L, -14024L, -14474L, -14921L, -15364L, -15804L, -16240L, -16672L, -17100L, -17524L, -17944L, -18360L, -18772L, -19180L, -19583L, -19981L, -20375L, -20764L, -21148L, -21527L, -21901L, -22270L, -22634L, -22993L, -23346L, -23694L, -24037L, -24374L, -24705L, -25030L, -25350L, -25664L, -25971L, -26273L, -26568L, -26858L, -27141L, -27418L, -27688L, -27952L, -28210L, -28461L, -28705L, -28943L, -29174L, -29398L, -29615L, -29826L, -30029L, -30226L, -30415L, -30598L, -30773L, -30941L, -31102L, -31256L, -31402L, -31541L, -31673L, -31797L, -31914L, -32024L, -32126L, -32221L, -32308L, -32388L, -32460L, -32524L, -32581L, -32631L, -32673L, -32707L, -32734L, -32753L, -32764L, -32768L, -32764L, -32753L, -32734L, -32707L, -32673L, -32631L, -32581L, -32524L, -32460L, -32388L, -32308L, -32221L, -32126L, -32024L, -31914L, -31797L, -31673L, -31541L, -31402L, -31256L, -31102L, -30941L, -30773L, -30598L, -30415L, -30226L, -30029L, -29826L, -29615L, -29398L, -29174L, -28943L, -28705L, -28461L, -28210L, -27952L, -27688L, -27418L, -27141L, -26858L, -26568L, -26273L, -25971L, -25664L, -25350L, -25030L, -24705L, -24374L, -24037L, -23694L, -23346L, -22993L, -22634L, -22270L, -21901L, -21527L, -21148L, -20764L, -20375L, -19981L, -19583L, -19180L, -18772L, -18360L, -17944L, -17524L, -17100L, -16672L, -16240L, -15804L, -15364L, -14921L, -14474L, -14024L, -13571L, -13115L, -12655L, -12193L, -11727L, -11259L, -10789L, -10316L, -9840L, -9363L, -8883L, -8401L, -7917L, -7431L, -6943L, -6454L, -5963L, -5471L, -4978L, -4483L, -3988L, -3491L, -2994L, -2496L, -1998L, -1499L, -999L, -500L, }; static byte capidtmf_leading_zeroes_table[0x100] = { 8, 7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; #define capidtmf_byte_leading_zeroes(b) (capidtmf_leading_zeroes_table[(BYTE)(b)]) #define capidtmf_word_leading_zeroes(w) (((w) & 0xff00) ? capidtmf_leading_zeroes_table[(w) >> 8] : 8 + capidtmf_leading_zeroes_table[(w)]) #define capidtmf_dword_leading_zeroes(d) (((d) & 0xffff0000L) ? (((d) & 0xff000000L) ? capidtmf_leading_zeroes_table[(d) >> 24] : 8 + capidtmf_leading_zeroes_table[(d) >> 16]) : (((d) & 0xff00) ? 16 + capidtmf_leading_zeroes_table[(d) >> 8] : 24 + capidtmf_leading_zeroes_table[(d)])) /*---------------------------------------------------------------------------*/ static void capidtmf_goertzel_loop (long *buffer, long *coeffs, short *sample, long count) { int i, j; long c, d, q0, q1, q2; for (i = 0; i < CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT - 1; i++) { q1 = buffer[i]; q2 = buffer[i + CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT]; d = coeffs[i] >> 1; c = d << 1; if (c >= 0) { for (j = 0; j < count; j++) { q0 = sample[j] - q2 + (c * (q1 >> 16)) + (((dword)(((dword) d) * ((dword)(q1 & 0xffff)))) >> 15); q2 = q1; q1 = q0; } } else { c = -c; d = -d; for (j = 0; j < count; j++) { q0 = sample[j] - q2 - ((c * (q1 >> 16)) + (((dword)(((dword) d) * ((dword)(q1 & 0xffff)))) >> 15)); q2 = q1; q1 = q0; } } buffer[i] = q1; buffer[i + CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT] = q2; } q1 = buffer[i]; q2 = buffer[i + CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT]; c = (coeffs[i] >> 1) << 1; if (c >= 0) { for (j = 0; j < count; j++) { q0 = sample[j] - q2 + (c * (q1 >> 16)) + (((dword)(((dword)(c >> 1)) * ((dword)(q1 & 0xffff)))) >> 15); q2 = q1; q1 = q0; c -= CAPIDTMF_RECV_FUNDAMENTAL_DECREMENT; } } else { c = -c; for (j = 0; j < count; j++) { q0 = sample[j] - q2 - ((c * (q1 >> 16)) + (((dword)(((dword)(c >> 1)) * ((dword)(q1 & 0xffff)))) >> 15)); q2 = q1; q1 = q0; c += CAPIDTMF_RECV_FUNDAMENTAL_DECREMENT; } } coeffs[i] = c; buffer[i] = q1; buffer[i + CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT] = q2; } static void capidtmf_goertzel_result (long *buffer, long *coeffs) { int i; long d, e, q1, q2, lo, mid, hi; dword k; for (i = 0; i < CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT; i++) { q1 = buffer[i]; q2 = buffer[i + CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT]; d = coeffs[i] >> 1; if (d >= 0) d = ((d << 1) * (-q1 >> 16)) + (((dword)(((dword) d) * ((dword)(-q1 & 0xffff)))) >> 15); else d = ((-d << 1) * (-q1 >> 16)) + (((dword)(((dword) -d) * ((dword)(-q1 & 0xffff)))) >> 15); e = (q2 >= 0) ? q2 : -q2; if (d >= 0) { k = ((dword)(d & 0xffff)) * ((dword)(e & 0xffff)); lo = k & 0xffff; mid = k >> 16; k = ((dword)(d >> 16)) * ((dword)(e & 0xffff)); mid += k & 0xffff; hi = k >> 16; k = ((dword)(d & 0xffff)) * ((dword)(e >> 16)); mid += k & 0xffff; hi += k >> 16; hi += ((dword)(d >> 16)) * ((dword)(e >> 16)); } else { d = -d; k = ((dword)(d & 0xffff)) * ((dword)(e & 0xffff)); lo = -((long)(k & 0xffff)); mid = -((long)(k >> 16)); k = ((dword)(d >> 16)) * ((dword)(e & 0xffff)); mid -= k & 0xffff; hi = -((long)(k >> 16)); k = ((dword)(d & 0xffff)) * ((dword)(e >> 16)); mid -= k & 0xffff; hi -= k >> 16; hi -= ((dword)(d >> 16)) * ((dword)(e >> 16)); } if (q2 < 0) { lo = -lo; mid = -mid; hi = -hi; } d = (q1 >= 0) ? q1 : -q1; k = ((dword)(d & 0xffff)) * ((dword)(d & 0xffff)); lo += k & 0xffff; mid += k >> 16; k = ((dword)(d >> 16)) * ((dword)(d & 0xffff)); mid += (k & 0xffff) << 1; hi += (k >> 16) << 1; hi += ((dword)(d >> 16)) * ((dword)(d >> 16)); d = (q2 >= 0) ? q2 : -q2; k = ((dword)(d & 0xffff)) * ((dword)(d & 0xffff)); lo += k & 0xffff; mid += k >> 16; k = ((dword)(d >> 16)) * ((dword)(d & 0xffff)); mid += (k & 0xffff) << 1; hi += (k >> 16) << 1; hi += ((dword)(d >> 16)) * ((dword)(d >> 16)); mid += lo >> 16; hi += mid >> 16; buffer[i] = (lo & 0xffff) | (mid << 16); buffer[i + CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT] = hi; } } /*---------------------------------------------------------------------------*/ #define CAPIDTMF_RECV_GUARD_SNR_INDEX_697 0 #define CAPIDTMF_RECV_GUARD_SNR_INDEX_770 1 #define CAPIDTMF_RECV_GUARD_SNR_INDEX_852 2 #define CAPIDTMF_RECV_GUARD_SNR_INDEX_941 3 #define CAPIDTMF_RECV_GUARD_SNR_INDEX_1209 4 #define CAPIDTMF_RECV_GUARD_SNR_INDEX_1336 5 #define CAPIDTMF_RECV_GUARD_SNR_INDEX_1477 6 #define CAPIDTMF_RECV_GUARD_SNR_INDEX_1633 7 #define CAPIDTMF_RECV_GUARD_SNR_INDEX_635 8 #define CAPIDTMF_RECV_GUARD_SNR_INDEX_1010 9 #define CAPIDTMF_RECV_GUARD_SNR_INDEX_1140 10 #define CAPIDTMF_RECV_GUARD_SNR_INDEX_1272 11 #define CAPIDTMF_RECV_GUARD_SNR_INDEX_1405 12 #define CAPIDTMF_RECV_GUARD_SNR_INDEX_1555 13 #define CAPIDTMF_RECV_GUARD_SNR_INDEX_1715 14 #define CAPIDTMF_RECV_GUARD_SNR_INDEX_1875 15 #define CAPIDTMF_RECV_GUARD_SNR_DONTCARE 0xc000 #define CAPIDTMF_RECV_NO_DIGIT 0xff #define CAPIDTMF_RECV_TIME_GRANULARITY (CAPIDTMF_RECV_ACCUMULATE_CYCLES + 1) #define CAPIDTMF_RECV_INDICATION_DIGIT 0x0001 static long capidtmf_recv_goertzel_coef_table[CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT] = { 0xda97L * 2, /* 697 Hz (Low group 697 Hz) */ 0xd299L * 2, /* 770 Hz (Low group 770 Hz) */ 0xc8cbL * 2, /* 852 Hz (Low group 852 Hz) */ 0xbd36L * 2, /* 941 Hz (Low group 941 Hz) */ 0x9501L * 2, /* 1209 Hz (High group 1209 Hz) */ 0x7f89L * 2, /* 1336 Hz (High group 1336 Hz) */ 0x6639L * 2, /* 1477 Hz (High group 1477 Hz) */ 0x48c6L * 2, /* 1633 Hz (High group 1633 Hz) */ 0xe14cL * 2, /* 630 Hz (Lower guard of low group 631 Hz) */ 0xb2e0L * 2, /* 1015 Hz (Upper guard of low group 1039 Hz) */ 0xa1a0L * 2, /* 1130 Hz (Lower guard of high group 1140 Hz) */ 0x8a87L * 2, /* 1272 Hz (Guard between 1209 Hz and 1336 Hz: 1271 Hz) */ 0x7353L * 2, /* 1405 Hz (2nd harmonics of 697 Hz and guard between 1336 Hz and 1477 Hz: 1405 Hz) */ 0x583bL * 2, /* 1552 Hz (2nd harmonics of 770 Hz and guard between 1477 Hz and 1633 Hz: 1553 Hz) */ 0x37d8L * 2, /* 1720 Hz (2nd harmonics of 852 Hz and upper guard of high group: 1715 Hz) */ 0x0000L * 2 /* 100-630 Hz (fundamentals) */ }; static word capidtmf_recv_guard_snr_low_table[CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT] = { 14, /* Low group peak versus 697 Hz */ 14, /* Low group peak versus 770 Hz */ 16, /* Low group peak versus 852 Hz */ 16, /* Low group peak versus 941 Hz */ CAPIDTMF_RECV_GUARD_SNR_DONTCARE, /* Low group peak versus 1209 Hz */ CAPIDTMF_RECV_GUARD_SNR_DONTCARE, /* Low group peak versus 1336 Hz */ CAPIDTMF_RECV_GUARD_SNR_DONTCARE, /* Low group peak versus 1477 Hz */ CAPIDTMF_RECV_GUARD_SNR_DONTCARE, /* Low group peak versus 1633 Hz */ 14, /* Low group peak versus 635 Hz */ 16, /* Low group peak versus 1010 Hz */ CAPIDTMF_RECV_GUARD_SNR_DONTCARE, /* Low group peak versus 1140 Hz */ CAPIDTMF_RECV_GUARD_SNR_DONTCARE, /* Low group peak versus 1272 Hz */ DSPDTMF_RX_HARMONICS_SEL_DEFAULT - 8, /* Low group peak versus 1405 Hz */ DSPDTMF_RX_HARMONICS_SEL_DEFAULT - 4, /* Low group peak versus 1555 Hz */ DSPDTMF_RX_HARMONICS_SEL_DEFAULT - 4, /* Low group peak versus 1715 Hz */ 12 /* Low group peak versus 100-630 Hz */ }; static word capidtmf_recv_guard_snr_high_table[CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT] = { CAPIDTMF_RECV_GUARD_SNR_DONTCARE, /* High group peak versus 697 Hz */ CAPIDTMF_RECV_GUARD_SNR_DONTCARE, /* High group peak versus 770 Hz */ CAPIDTMF_RECV_GUARD_SNR_DONTCARE, /* High group peak versus 852 Hz */ CAPIDTMF_RECV_GUARD_SNR_DONTCARE, /* High group peak versus 941 Hz */ 20, /* High group peak versus 1209 Hz */ 20, /* High group peak versus 1336 Hz */ 20, /* High group peak versus 1477 Hz */ 20, /* High group peak versus 1633 Hz */ CAPIDTMF_RECV_GUARD_SNR_DONTCARE, /* High group peak versus 635 Hz */ CAPIDTMF_RECV_GUARD_SNR_DONTCARE, /* High group peak versus 1010 Hz */ 16, /* High group peak versus 1140 Hz */ 4, /* High group peak versus 1272 Hz */ 6, /* High group peak versus 1405 Hz */ 8, /* High group peak versus 1555 Hz */ 16, /* High group peak versus 1715 Hz */ 12 /* High group peak versus 100-630 Hz */ }; /*---------------------------------------------------------------------------*/ static void capidtmf_recv_init (t_capidtmf_state *p_state) { p_state->recv.min_gap_duration = 1; p_state->recv.min_digit_duration = 1; p_state->recv.cycle_counter = 0; p_state->recv.current_digit_on_time = 0; p_state->recv.current_digit_off_time = 0; p_state->recv.current_digit_value = CAPIDTMF_RECV_NO_DIGIT; p_state->recv.digit_write_pos = 0; p_state->recv.digit_read_pos = 0; p_state->recv.indication_state = 0; p_state->recv.indication_state_ack = 0; p_state->recv.state = CAPIDTMF_RECV_STATE_IDLE; } void capidtmf_recv_enable (t_capidtmf_state *p_state, word min_digit_duration, word min_gap_duration) { p_state->recv.indication_state_ack &= CAPIDTMF_RECV_INDICATION_DIGIT; p_state->recv.min_digit_duration = (word)(((((dword) min_digit_duration) * 8) + ((dword)(CAPIDTMF_RECV_TIME_GRANULARITY / 2))) / ((dword) CAPIDTMF_RECV_TIME_GRANULARITY)); if (p_state->recv.min_digit_duration <= 1) p_state->recv.min_digit_duration = 1; else (p_state->recv.min_digit_duration)--; p_state->recv.min_gap_duration = (word)((((dword) min_gap_duration) * 8) / ((dword) CAPIDTMF_RECV_TIME_GRANULARITY)); if (p_state->recv.min_gap_duration <= 1) p_state->recv.min_gap_duration = 1; else (p_state->recv.min_gap_duration)--; p_state->recv.state |= CAPIDTMF_RECV_STATE_DTMF_ACTIVE; } void capidtmf_recv_disable (t_capidtmf_state *p_state) { p_state->recv.state &= ~CAPIDTMF_RECV_STATE_DTMF_ACTIVE; if (p_state->recv.state == CAPIDTMF_RECV_STATE_IDLE) capidtmf_recv_init (p_state); else { p_state->recv.cycle_counter = 0; p_state->recv.current_digit_on_time = 0; p_state->recv.current_digit_off_time = 0; p_state->recv.current_digit_value = CAPIDTMF_RECV_NO_DIGIT; } } word capidtmf_recv_indication (t_capidtmf_state *p_state, byte *buffer) { word i, j, k, flags; flags = p_state->recv.indication_state ^ p_state->recv.indication_state_ack; p_state->recv.indication_state_ack ^= flags & CAPIDTMF_RECV_INDICATION_DIGIT; if (p_state->recv.digit_write_pos != p_state->recv.digit_read_pos) { i = 0; k = p_state->recv.digit_write_pos; j = p_state->recv.digit_read_pos; do { buffer[i++] = p_state->recv.digit_buffer[j]; j = (j == CAPIDTMF_RECV_DIGIT_BUFFER_SIZE - 1) ? 0 : j + 1; } while (j != k); p_state->recv.digit_read_pos = k; return (i); } p_state->recv.indication_state_ack ^= flags; return (0); } #define CAPIDTMF_RECV_WINDOWED_SAMPLES 32 void capidtmf_recv_block (t_capidtmf_state *p_state, byte *buffer, word length) { byte result_digit; word sample_number, cycle_counter, n, i; word low_peak, high_peak; dword lo, hi; byte *p; short *q; byte goertzel_result_buffer[CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT]; short windowed_sample_buffer[CAPIDTMF_RECV_WINDOWED_SAMPLES]; if (p_state->recv.state & CAPIDTMF_RECV_STATE_DTMF_ACTIVE) { cycle_counter = p_state->recv.cycle_counter; sample_number = 0; while (sample_number < length) { if (cycle_counter < CAPIDTMF_RECV_ACCUMULATE_CYCLES) { if (cycle_counter == 0) { for (i = 0; i < CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT; i++) { p_state->recv.goertzel_buffer[0][i] = 0; p_state->recv.goertzel_buffer[1][i] = 0; } } n = CAPIDTMF_RECV_ACCUMULATE_CYCLES - cycle_counter; if (n > length - sample_number) n = length - sample_number; if (n > CAPIDTMF_RECV_WINDOWED_SAMPLES) n = CAPIDTMF_RECV_WINDOWED_SAMPLES; p = buffer + sample_number; q = capidtmf_recv_window_function + cycle_counter; if (p_state->ulaw) { for (i = 0; i < n; i++) { windowed_sample_buffer[i] = (short)((capidtmf_expand_table_ulaw[p[i]] * ((long)(q[i]))) >> 15); } } else { for (i = 0; i < n; i++) { windowed_sample_buffer[i] = (short)((capidtmf_expand_table_alaw[p[i]] * ((long)(q[i]))) >> 15); } } capidtmf_recv_goertzel_coef_table[CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT - 1] = CAPIDTMF_RECV_FUNDAMENTAL_OFFSET; capidtmf_goertzel_loop (p_state->recv.goertzel_buffer[0], capidtmf_recv_goertzel_coef_table, windowed_sample_buffer, n); cycle_counter += n; sample_number += n; } else { capidtmf_goertzel_result (p_state->recv.goertzel_buffer[0], capidtmf_recv_goertzel_coef_table); for (i = 0; i < CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT; i++) { lo = (dword)(p_state->recv.goertzel_buffer[0][i]); hi = (dword)(p_state->recv.goertzel_buffer[1][i]); if (hi != 0) { n = capidtmf_dword_leading_zeroes (hi); hi = (hi << n) | (lo >> (32 - n)); } else { n = capidtmf_dword_leading_zeroes (lo); hi = lo << n; n += 32; } n = 195 - 3 * n; if (hi >= 0xcb300000L) n += 2; else if (hi >= 0xa1450000L) n++; goertzel_result_buffer[i] = (byte) n; } low_peak = DSPDTMF_RX_SENSITIVITY_LOW_DEFAULT; result_digit = CAPIDTMF_RECV_NO_DIGIT; for (i = 0; i < CAPIDTMF_LOW_GROUP_FREQUENCIES; i++) { if (goertzel_result_buffer[i] > low_peak) { low_peak = goertzel_result_buffer[i]; result_digit = (byte) i; } } high_peak = DSPDTMF_RX_SENSITIVITY_HIGH_DEFAULT; n = CAPIDTMF_RECV_NO_DIGIT; for (i = CAPIDTMF_LOW_GROUP_FREQUENCIES; i < CAPIDTMF_RECV_BASE_FREQUENCY_COUNT; i++) { if (goertzel_result_buffer[i] > high_peak) { high_peak = goertzel_result_buffer[i]; n = (i - CAPIDTMF_LOW_GROUP_FREQUENCIES) << 2; } } result_digit |= (byte) n; if (low_peak + DSPDTMF_RX_HIGH_EXCEEDING_LOW_DEFAULT < high_peak) result_digit = CAPIDTMF_RECV_NO_DIGIT; if (high_peak + DSPDTMF_RX_LOW_EXCEEDING_HIGH_DEFAULT < low_peak) result_digit = CAPIDTMF_RECV_NO_DIGIT; n = 0; for (i = 0; i < CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT; i++) { if ((((short)(low_peak - goertzel_result_buffer[i] - capidtmf_recv_guard_snr_low_table[i])) < 0) || (((short)(high_peak - goertzel_result_buffer[i] - capidtmf_recv_guard_snr_high_table[i])) < 0)) { n++; } } if (n != 2) result_digit = CAPIDTMF_RECV_NO_DIGIT; if (result_digit == CAPIDTMF_RECV_NO_DIGIT) { if (p_state->recv.current_digit_on_time != 0) { if (++(p_state->recv.current_digit_off_time) >= p_state->recv.min_gap_duration) { p_state->recv.current_digit_on_time = 0; p_state->recv.current_digit_off_time = 0; } } else { if (p_state->recv.current_digit_off_time != 0) (p_state->recv.current_digit_off_time)--; } } else { if ((p_state->recv.current_digit_on_time == 0) && (p_state->recv.current_digit_off_time != 0)) { (p_state->recv.current_digit_off_time)--; } else { n = p_state->recv.current_digit_off_time; if ((p_state->recv.current_digit_on_time != 0) && (result_digit != p_state->recv.current_digit_value)) { p_state->recv.current_digit_on_time = 0; n = 0; } p_state->recv.current_digit_value = result_digit; p_state->recv.current_digit_off_time = 0; if (p_state->recv.current_digit_on_time != 0xffff) { p_state->recv.current_digit_on_time += n + 1; if (p_state->recv.current_digit_on_time >= p_state->recv.min_digit_duration) { p_state->recv.current_digit_on_time = 0xffff; i = (p_state->recv.digit_write_pos == CAPIDTMF_RECV_DIGIT_BUFFER_SIZE - 1) ? 0 : p_state->recv.digit_write_pos + 1; if (i == p_state->recv.digit_read_pos) { trace (dprintf ("%s,%d: Receive digit overrun", (char *)(FILE_), __LINE__)); } else { p_state->recv.digit_buffer[p_state->recv.digit_write_pos] = result_digit; p_state->recv.digit_write_pos = i; p_state->recv.indication_state = (p_state->recv.indication_state & ~CAPIDTMF_RECV_INDICATION_DIGIT) | (~p_state->recv.indication_state_ack & CAPIDTMF_RECV_INDICATION_DIGIT); } } } } } cycle_counter = 0; sample_number++; } } p_state->recv.cycle_counter = cycle_counter; } } void capidtmf_init (t_capidtmf_state *p_state, byte ulaw) { p_state->ulaw = ulaw; capidtmf_recv_init (p_state); } /*---------------------------------------------------------------------------*/ |