428 lines
17 KiB
C++
428 lines
17 KiB
C++
#ifndef INCLUDED_IMBE_FRAME_H
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#define INCLUDED_IMBE_FRAME_H
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#include <cstddef>
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#include <stdint.h>
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#include <vector>
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#include <op25_yank.h>
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#include <op25_golay.h>
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#include <op25_hamming.h>
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typedef std::vector<bool> voice_codeword;
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typedef const std::vector<bool> const_bit_vector;
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typedef std::vector<bool> bit_vector;
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static const size_t nof_voice_codewords = 9, voice_codeword_sz = 144;
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static const uint16_t imbe_ldu_NID_bits[] = {
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48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59,
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60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 72, 73,
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74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85,
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86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97,
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98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109,
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110, 111, 112, 113 };
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static const uint16_t imbe_ldu_status_bits[] = {
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70, 71, 142, 143, 214, 215, 286, 287, 358, 359, 430, 431,
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502, 503, 574, 575, 646, 647, 718, 719, 790, 791, 862, 863,
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934, 935, 1006, 1007, 1078, 1079, 1150, 1151, 1222, 1223, 1294, 1295,
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1366, 1367, 1438, 1439, 1510, 1511, 1582, 1583, 1654, 1655, 1726, 1727 };
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static const uint16_t imbe_ldu_lcf_bits[] = {
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410, 411, 412, 413, 414, 415, 420, 421,
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422, 423, 424, 425, 432, 433, 434, 435,
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436, 437, 442, 443, 444, 445, 446, 447,
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600, 601, 602, 603, 604, 605, 610, 611,
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612, 613, 614, 615, 620, 621, 622, 623,
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624, 625, 630, 631, 632, 633, 634, 635,
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788, 789, 792, 793, 794, 795, 800, 801,
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802, 803, 804, 805, 810, 811, 812, 813,
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814, 815, 820, 821, 822, 823, 824, 825 };
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// FIXME: separate these into their respective fields
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static const uint16_t imbe_ldu_ls_data_bits[] = {
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410, 411, 412, 413, 414, 415, 416, 417, 418, 419, 420, 421,
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422, 423, 424, 425, 426, 427, 428, 429, 432, 433, 434, 435,
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436, 437, 438, 439, 440, 441, 442, 443, 444, 445, 446, 447,
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448, 449, 450, 451, 600, 601, 602, 603, 604, 605, 606, 607,
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608, 609, 610, 611, 612, 613, 614, 615, 616, 617, 618, 619,
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620, 621, 622, 623, 624, 625, 626, 627, 628, 629, 630, 631,
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632, 633, 634, 635, 636, 637, 638, 639, 788, 789, 792, 793,
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794, 795, 796, 797, 798, 799, 800, 801, 802, 803, 804, 805,
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806, 807, 808, 809, 810, 811, 812, 813, 814, 815, 816, 817,
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818, 819, 820, 821, 822, 823, 824, 825, 826, 827, 828, 829,
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978, 979, 980, 981, 982, 983, 984, 985, 986, 987, 988, 989,
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990, 991, 992, 993, 994, 995, 996, 997, 998, 999, 1000, 1001,
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1002, 1003, 1004, 1005, 1008, 1009, 1010, 1011, 1012, 1013, 1014, 1015,
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1016, 1017, 1018, 1019, 1168, 1169, 1170, 1171, 1172, 1173, 1174, 1175,
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1176, 1177, 1178, 1179, 1180, 1181, 1182, 1183, 1184, 1185, 1186, 1187,
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1188, 1189, 1190, 1191, 1192, 1193, 1194, 1195, 1196, 1197, 1198, 1199,
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1200, 1201, 1202, 1203, 1204, 1205, 1206, 1207, 1356, 1357, 1358, 1359,
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1360, 1361, 1362, 1363, 1364, 1365, 1368, 1369, 1370, 1371, 1372, 1373,
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1374, 1375, 1376, 1377, 1378, 1379, 1380, 1381, 1382, 1383, 1384, 1385,
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1386, 1387, 1388, 1389, 1390, 1391, 1392, 1393, 1394, 1395, 1396, 1397,
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1546, 1547, 1548, 1549, 1550, 1551, 1552, 1553, 1554, 1555, 1556, 1557,
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1558, 1559, 1560, 1561, 1562, 1563, 1564, 1565, 1566, 1567, 1568, 1569,
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1570, 1571, 1572, 1573, 1574, 1575, 1576, 1577 };
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static const uint16_t voice_codeword_bits[nof_voice_codewords][voice_codeword_sz] = {
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{ 114, 121, 126, 133, 138, 147, 152, 159, 164, 171, 176, 183,
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188, 195, 200, 207, 212, 221, 226, 233, 238, 245, 250, 257,
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115, 120, 127, 132, 139, 146, 153, 158, 165, 170, 177, 182,
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189, 194, 201, 206, 213, 220, 227, 232, 239, 244, 251, 256,
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116, 123, 128, 135, 140, 149, 154, 161, 166, 173, 178, 185,
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190, 197, 202, 209, 216, 223, 228, 235, 240, 247, 252, 259,
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117, 122, 129, 134, 141, 148, 155, 160, 167, 172, 179, 184,
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191, 196, 203, 208, 217, 222, 229, 234, 241, 246, 253, 258,
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118, 125, 130, 137, 144, 151, 156, 163, 168, 175, 180, 187,
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192, 199, 204, 211, 218, 225, 230, 237, 242, 249, 254, 261,
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119, 124, 131, 136, 145, 150, 157, 162, 169, 174, 181, 186,
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193, 198, 205, 210, 219, 224, 231, 236, 243, 248, 255, 260 },
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{ 262, 269, 274, 281, 288, 295, 300, 307, 312, 319, 324, 331,
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336, 343, 348, 355, 362, 369, 374, 381, 386, 393, 398, 405,
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263, 268, 275, 280, 289, 294, 301, 306, 313, 318, 325, 330,
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337, 342, 349, 354, 363, 368, 375, 380, 387, 392, 399, 404,
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264, 271, 276, 283, 290, 297, 302, 309, 314, 321, 326, 333,
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338, 345, 350, 357, 364, 371, 376, 383, 388, 395, 400, 407,
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265, 270, 277, 282, 291, 296, 303, 308, 315, 320, 327, 332,
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339, 344, 351, 356, 365, 370, 377, 382, 389, 394, 401, 406,
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266, 273, 278, 285, 292, 299, 304, 311, 316, 323, 328, 335,
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340, 347, 352, 361, 366, 373, 378, 385, 390, 397, 402, 409,
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267, 272, 279, 284, 293, 298, 305, 310, 317, 322, 329, 334,
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341, 346, 353, 360, 367, 372, 379, 384, 391, 396, 403, 408 },
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{ 452, 459, 464, 471, 476, 483, 488, 495, 500, 509, 514, 521,
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526, 533, 538, 545, 550, 557, 562, 569, 576, 583, 588, 595,
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453, 458, 465, 470, 477, 482, 489, 494, 501, 508, 515, 520,
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527, 532, 539, 544, 551, 556, 563, 568, 577, 582, 589, 594,
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454, 461, 466, 473, 478, 485, 490, 497, 504, 511, 516, 523,
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528, 535, 540, 547, 552, 559, 564, 571, 578, 585, 590, 597,
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455, 460, 467, 472, 479, 484, 491, 496, 505, 510, 517, 522,
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529, 534, 541, 546, 553, 558, 565, 570, 579, 584, 591, 596,
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456, 463, 468, 475, 480, 487, 492, 499, 506, 513, 518, 525,
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530, 537, 542, 549, 554, 561, 566, 573, 580, 587, 592, 599,
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457, 462, 469, 474, 481, 486, 493, 498, 507, 512, 519, 524,
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531, 536, 543, 548, 555, 560, 567, 572, 581, 586, 593, 598 },
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{ 640, 649, 654, 661, 666, 673, 678, 685, 690, 697, 702, 709,
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714, 723, 728, 735, 740, 747, 752, 759, 764, 771, 776, 783,
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641, 648, 655, 660, 667, 672, 679, 684, 691, 696, 703, 708,
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715, 722, 729, 734, 741, 746, 753, 758, 765, 770, 777, 782,
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642, 651, 656, 663, 668, 675, 680, 687, 692, 699, 704, 711,
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716, 725, 730, 737, 742, 749, 754, 761, 766, 773, 778, 785,
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643, 650, 657, 662, 669, 674, 681, 686, 693, 698, 705, 710,
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717, 724, 731, 736, 743, 748, 755, 760, 767, 772, 779, 784,
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644, 653, 658, 665, 670, 677, 682, 689, 694, 701, 706, 713,
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720, 727, 732, 739, 744, 751, 756, 763, 768, 775, 780, 787,
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645, 652, 659, 664, 671, 676, 683, 688, 695, 700, 707, 712,
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721, 726, 733, 738, 745, 750, 757, 762, 769, 774, 781, 786 },
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{ 830, 837, 842, 849, 854, 861, 868, 875, 880, 887, 892, 899,
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904, 911, 916, 923, 928, 937, 942, 949, 954, 961, 966, 973,
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831, 836, 843, 848, 855, 860, 869, 874, 881, 886, 893, 898,
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905, 910, 917, 922, 929, 936, 943, 948, 955, 960, 967, 972,
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832, 839, 844, 851, 856, 865, 870, 877, 882, 889, 894, 901,
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906, 913, 918, 925, 930, 939, 944, 951, 956, 963, 968, 975,
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833, 838, 845, 850, 857, 864, 871, 876, 883, 888, 895, 900,
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907, 912, 919, 924, 931, 938, 945, 950, 957, 962, 969, 974,
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834, 841, 846, 853, 858, 867, 872, 879, 884, 891, 896, 903,
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908, 915, 920, 927, 932, 941, 946, 953, 958, 965, 970, 977,
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835, 840, 847, 852, 859, 866, 873, 878, 885, 890, 897, 902,
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909, 914, 921, 926, 933, 940, 947, 952, 959, 964, 971, 976 },
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{ 1020, 1027, 1032, 1039, 1044, 1051, 1056, 1063, 1068, 1075, 1082, 1089,
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1094, 1101, 1106, 1113, 1118, 1125, 1130, 1137, 1142, 1149, 1156, 1163,
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1021, 1026, 1033, 1038, 1045, 1050, 1057, 1062, 1069, 1074, 1083, 1088,
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1095, 1100, 1107, 1112, 1119, 1124, 1131, 1136, 1143, 1148, 1157, 1162,
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1022, 1029, 1034, 1041, 1046, 1053, 1058, 1065, 1070, 1077, 1084, 1091,
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1096, 1103, 1108, 1115, 1120, 1127, 1132, 1139, 1144, 1153, 1158, 1165,
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1023, 1028, 1035, 1040, 1047, 1052, 1059, 1064, 1071, 1076, 1085, 1090,
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1097, 1102, 1109, 1114, 1121, 1126, 1133, 1138, 1145, 1152, 1159, 1164,
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1024, 1031, 1036, 1043, 1048, 1055, 1060, 1067, 1072, 1081, 1086, 1093,
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1098, 1105, 1110, 1117, 1122, 1129, 1134, 1141, 1146, 1155, 1160, 1167,
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1025, 1030, 1037, 1042, 1049, 1054, 1061, 1066, 1073, 1080, 1087, 1092,
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1099, 1104, 1111, 1116, 1123, 1128, 1135, 1140, 1147, 1154, 1161, 1166 },
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{ 1208, 1215, 1220, 1229, 1234, 1241, 1246, 1253, 1258, 1265, 1270, 1277,
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1282, 1289, 1296, 1303, 1308, 1315, 1320, 1327, 1332, 1339, 1344, 1351,
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1209, 1214, 1221, 1228, 1235, 1240, 1247, 1252, 1259, 1264, 1271, 1276,
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1283, 1288, 1297, 1302, 1309, 1314, 1321, 1326, 1333, 1338, 1345, 1350,
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1210, 1217, 1224, 1231, 1236, 1243, 1248, 1255, 1260, 1267, 1272, 1279,
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1284, 1291, 1298, 1305, 1310, 1317, 1322, 1329, 1334, 1341, 1346, 1353,
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1211, 1216, 1225, 1230, 1237, 1242, 1249, 1254, 1261, 1266, 1273, 1278,
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1285, 1290, 1299, 1304, 1311, 1316, 1323, 1328, 1335, 1340, 1347, 1352,
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1212, 1219, 1226, 1233, 1238, 1245, 1250, 1257, 1262, 1269, 1274, 1281,
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1286, 1293, 1300, 1307, 1312, 1319, 1324, 1331, 1336, 1343, 1348, 1355,
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1213, 1218, 1227, 1232, 1239, 1244, 1251, 1256, 1263, 1268, 1275, 1280,
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1287, 1292, 1301, 1306, 1313, 1318, 1325, 1330, 1337, 1342, 1349, 1354 },
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{ 1398, 1405, 1410, 1417, 1422, 1429, 1434, 1443, 1448, 1455, 1460, 1467,
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1472, 1479, 1484, 1491, 1496, 1503, 1508, 1517, 1522, 1529, 1534, 1541,
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1399, 1404, 1411, 1416, 1423, 1428, 1435, 1442, 1449, 1454, 1461, 1466,
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1473, 1478, 1485, 1490, 1497, 1502, 1509, 1516, 1523, 1528, 1535, 1540,
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1400, 1407, 1412, 1419, 1424, 1431, 1436, 1445, 1450, 1457, 1462, 1469,
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1474, 1481, 1486, 1493, 1498, 1505, 1512, 1519, 1524, 1531, 1536, 1543,
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1401, 1406, 1413, 1418, 1425, 1430, 1437, 1444, 1451, 1456, 1463, 1468,
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1475, 1480, 1487, 1492, 1499, 1504, 1513, 1518, 1525, 1530, 1537, 1542,
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1402, 1409, 1414, 1421, 1426, 1433, 1440, 1447, 1452, 1459, 1464, 1471,
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1476, 1483, 1488, 1495, 1500, 1507, 1514, 1521, 1526, 1533, 1538, 1545,
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1403, 1408, 1415, 1420, 1427, 1432, 1441, 1446, 1453, 1458, 1465, 1470,
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1477, 1482, 1489, 1494, 1501, 1506, 1515, 1520, 1527, 1532, 1539, 1544 },
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{ 1578, 1587, 1592, 1599, 1604, 1611, 1616, 1623, 1628, 1635, 1640, 1647,
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1652, 1661, 1666, 1673, 1678, 1685, 1690, 1697, 1702, 1709, 1714, 1721,
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1579, 1586, 1593, 1598, 1605, 1610, 1617, 1622, 1629, 1634, 1641, 1646,
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1653, 1660, 1667, 1672, 1679, 1684, 1691, 1696, 1703, 1708, 1715, 1720,
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1580, 1589, 1594, 1601, 1606, 1613, 1618, 1625, 1630, 1637, 1642, 1649,
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1656, 1663, 1668, 1675, 1680, 1687, 1692, 1699, 1704, 1711, 1716, 1723,
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1581, 1588, 1595, 1600, 1607, 1612, 1619, 1624, 1631, 1636, 1643, 1648,
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1657, 1662, 1669, 1674, 1681, 1686, 1693, 1698, 1705, 1710, 1717, 1722,
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1584, 1591, 1596, 1603, 1608, 1615, 1620, 1627, 1632, 1639, 1644, 1651,
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1658, 1665, 1670, 1677, 1682, 1689, 1694, 1701, 1706, 1713, 1718, 1725,
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1585, 1590, 1597, 1602, 1609, 1614, 1621, 1626, 1633, 1638, 1645, 1650,
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1659, 1664, 1671, 1676, 1683, 1688, 1695, 1700, 1707, 1712, 1719, 1724 },
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};
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#if DEBUG
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/*
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* Convert bit vector to hex dump format and print
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*/
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static inline void
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dump_cw(const voice_codeword& cw, int len, FILE* fp) // len in bytes
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{
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int i, j;
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for (i = 0; i < len; i++){
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int p = 0;
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for (j = 0; j < 8; j++){
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p = (p << 1) + cw[ i*8 + j ];
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}
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fprintf(fp, "%02x ", p);
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if (!((i+1) % 16))
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fprintf(fp, "\n");
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}
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fprintf(fp, "\n");
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}
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#endif
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static inline void
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imbe_store_bits(voice_codeword& cw, int s, int l, uint32_t v)
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{
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for (int i = l-1; i >= s; i--) {
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cw[i] = v & 1;
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v >>= 1;
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}
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}
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static inline uint32_t
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pngen15(uint32_t& Pr)
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{
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int n = 0;
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for(int i = 14; i >= 0; --i) {
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Pr = (173 * Pr + 13849) & 0xffffu;
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if(Pr & 32768) {
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n += (1 << i);
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}
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}
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return n;
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}
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static inline uint32_t
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pngen23(uint32_t& Pr)
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{
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int n = 0;
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for(int i = 22; i >= 0; --i) {
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Pr = (173 * Pr + 13849) & 0xffffu;
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if(Pr & 32768) {
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n += (1 << i);
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}
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}
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return n;
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}
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/* APCO IMBE header decoder.
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*
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* extracts 88 bits of IMBE parameters given an input 144-bit frame
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*
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* \param cw Codeword containing bits to be decoded
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* \param u0-u7 Result output vectors
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*/
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static inline void
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imbe_header_decode(const voice_codeword& cw, uint32_t& u0, uint32_t& u1, uint32_t& u2, uint32_t& u3, uint32_t& u4, uint32_t& u5, uint32_t& u6, uint32_t& u7, uint32_t& E0, uint32_t& ET)
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{
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ET = 0;
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size_t errs = 0;
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uint32_t v0 = extract(cw, 0, 23);
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errs = golay_23_decode(v0);
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u0 = v0;
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E0 = ET;
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uint32_t pn = u0 << 4;
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uint32_t m1 = pngen23(pn);
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uint32_t v1 = extract(cw, 23, 46) ^ m1;
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errs += golay_23_decode(v1);
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u1 = v1;
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uint32_t m2 = pngen23(pn);
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uint32_t v2 = extract(cw, 46, 69) ^ m2;
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errs += golay_23_decode(v2);
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u2 = v2;
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uint32_t m3 = pngen23(pn);
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uint32_t v3 = extract(cw, 69, 92) ^ m3;
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errs += golay_23_decode(v3);
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u3 = v3;
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uint32_t m4 = pngen15(pn);
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uint16_t v4 = extract(cw, 92, 107) ^ m4;
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errs += hamming_15_decode(v4);
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u4 = v4;
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uint32_t m5 = pngen15(pn);
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uint16_t v5 = extract(cw, 107, 122) ^ m5;
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errs += hamming_15_decode(v5);
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u5 = v5;
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uint32_t m6 = pngen15(pn);
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uint16_t v6 = extract(cw, 122, 137) ^ m6;
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errs += hamming_15_decode(v6);
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u6 = v6;
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u7 = extract(cw, 137, 144);
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u7 <<= 1; /* so that bit0 is free (see note about BOT bit */
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}
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/* APCO IMBE header encoder.
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*
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* given 88 bits of IMBE parameters, construct output 144-bit IMBE codeword
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*
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* \param cw Codeword into which 144 bits of results are placed
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* \param u0-u7 input parameters
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*/
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static inline void
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imbe_header_encode(voice_codeword& cw, uint32_t u0, uint32_t u1, uint32_t u2, uint32_t u3, uint32_t u4, uint32_t u5, uint32_t u6, uint32_t u7)
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{
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// given input 88-bit IMBE frame (in u0-u7),
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// add golay / hamming bits to produce a 144-bit frame.
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uint32_t c0, c1, c2, c3, c4, c5, c6, c7;
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uint32_t pn = u0 << 4;
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c0 = golay_23_encode(u0);
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imbe_store_bits(cw, 0, 23, c0);
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uint32_t m1 = pngen23(pn);
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c1 = golay_23_encode(u1) ^ m1;
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imbe_store_bits(cw, 23, 46, c1);
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uint32_t m2 = pngen23(pn);
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c2 = golay_23_encode(u2) ^ m2;
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imbe_store_bits(cw, 46, 69, c2);
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uint32_t m3 = pngen23(pn);
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c3 = golay_23_encode(u3) ^ m3;
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imbe_store_bits(cw, 69, 92, c3);
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uint32_t m4 = pngen15(pn);
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c4 = hamming_15_encode(u4) ^ m4;
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imbe_store_bits(cw, 92, 107, c4);
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uint32_t m5 = pngen15(pn);
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c5 = hamming_15_encode(u5) ^ m5;
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imbe_store_bits(cw, 107, 122, c5);
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uint32_t m6 = pngen15(pn);
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c6 = hamming_15_encode(u6) ^ m6;
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imbe_store_bits(cw, 122, 137, c6);
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c7 = u7;
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imbe_store_bits(cw, 137, 144, c7 >> 1);
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}
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static inline void
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imbe_deinterleave (const_bit_vector& frame_body, voice_codeword& cw, uint32_t frame_nr)
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{
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for(size_t j = 0; j < voice_codeword_sz; ++j) {
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cw[j] = frame_body[voice_codeword_bits[frame_nr][j]];
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}
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}
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static inline void
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imbe_interleave(bit_vector& frame_body, const voice_codeword& cw, uint32_t frame_nr)
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{
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for(size_t j = 0; j < voice_codeword_sz; ++j) {
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frame_body[voice_codeword_bits[frame_nr][j]] = cw[j];
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}
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}
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static inline void
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imbe_frame_unpack(uint8_t *A, uint32_t& u0, uint32_t& u1, uint32_t& u2, uint32_t& u3, uint32_t& u4, uint32_t& u5, uint32_t& u6, uint32_t& u7, uint32_t& E0, uint32_t& ET)
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{
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E0 = A[0];
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ET = A[1];
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u0 = A[4] + (E0 & 240) * 16;
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u1 = A[5] + (E0 & 15) * 256;
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u2 = A[6] + (ET & 240) * 16;
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u3 = A[7] + (ET & 15) * 256;
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E0 = A[2];
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ET = A[3];
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u4 = A[8] + (E0 & 224) * 8;
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u5 = A[9] + (E0 & 28) * 64;
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u6 = A[10] + (ET & 128) * 2 + (E0 & 3) * 512;
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u7 = ET & 127;
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E0 = A[11];
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if(E0 & 192) exit(4);
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ET = E0 & 3;
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E0 = (E0 & 84) / 4;
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}
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/*
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* Given a 144-bit IMBE frame(cw),
|
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* 1. Decode frame to error-corrected 88-bit format
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* 2. Re-encode frame into 144-bit format with refreshed Hamming/Golay encoding
|
|
* 3. FIXME: track decoding error rates and stats
|
|
*/
|
|
static inline void
|
|
imbe_regenerate_frame(bit_vector& cw) {
|
|
unsigned int u0 = 0;
|
|
unsigned int u1,u2,u3,u4,u5,u6,u7;
|
|
unsigned int E0 = 0;
|
|
unsigned int ET = 0;
|
|
|
|
// PN/Hamming/Golay - etc.
|
|
imbe_header_decode(cw, u0, u1, u2, u3, u4, u5, u6, u7, E0, ET) ;
|
|
#if DEBUG
|
|
printf("u_0: %x\r\nu_1: %x\r\nu_2: %x\r\nu_3: %x\r\nu_4: %x\r\nu_5: %x\r\nu_6: %x\r\nu_7: %x\r\n\r\n", u0, u1, u2, u3, u4, u5, u6, u7>>1);
|
|
#endif
|
|
imbe_header_encode(cw, u0, u1, u2, u3, u4, u5, u6, u7);
|
|
}
|
|
|
|
/*
|
|
* process voice units (ldu1 or ldu2)
|
|
* perform error correction for each of the nine embedded 144-bit frames
|
|
* by regenerating the error-correction coding bits
|
|
*/
|
|
static inline void
|
|
imbe_regenerate_voice_unit(bit_vector& frame_body) {
|
|
voice_codeword cw(voice_codeword_sz);
|
|
#if DEBUG
|
|
dump_cw(frame_body, 216, stderr);
|
|
#endif
|
|
for(size_t i = 0; i < nof_voice_codewords; ++i) {
|
|
imbe_deinterleave(frame_body, cw, i);
|
|
imbe_regenerate_frame(cw);
|
|
imbe_interleave(frame_body, cw, i);
|
|
}
|
|
#if DEBUG
|
|
dump_cw(frame_body, 216, stderr);
|
|
#endif
|
|
}
|
|
|
|
#endif /* INCLUDED_IMBE_FRAME_H */
|