| /* |
| * Block Gilbert-Moore decoder |
| * Copyright (c) 2010 Thilo Borgmann <thilo.borgmann _at_ mail.de> |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /** |
| * @file |
| * Block Gilbert-Moore decoder as used by MPEG-4 ALS |
| * @author Thilo Borgmann <thilo.borgmann _at_ mail.de> |
| */ |
| |
| #include "libavutil/attributes.h" |
| #include "bgmc.h" |
| |
| #define FREQ_BITS 14 // bits used by frequency counters |
| #define VALUE_BITS 18 // bits used to represent the values |
| #define TOP_VALUE ((1 << VALUE_BITS) - 1) // maximum value |
| #define FIRST_QTR (TOP_VALUE / 4 + 1) // first quarter of values maximum value |
| #define HALF (2 * FIRST_QTR) // first half of values maximum value |
| #define THIRD_QTR (3 * FIRST_QTR) // third quarter of values maximum value |
| |
| #define LUT_BITS (FREQ_BITS - 8) // number of bits used to index lookup tables |
| #define LUT_SIZE (1 << LUT_BITS) // size of the lookup tables |
| #define LUT_BUFF 4 // number of buffered lookup tables |
| |
| |
| /** Cumulative frequency tables for block Gilbert-Moore coding. */ |
| static const uint16_t cf_tables_1[3][129] = { |
| { |
| 16384, 16066, 15748, 15431, 15114, 14799, 14485, 14173, 13861, 13552, |
| 13243, 12939, 12635, 12336, 12038, 11745, 11452, 11161, 10870, 10586, |
| 10303, 10027, 9751, 9483, 9215, 8953, 8692, 8440, 8189, 7946, |
| 7704, 7472, 7240, 7008, 6776, 6554, 6333, 6122, 5912, 5711, |
| 5512, 5320, 5128, 4947, 4766, 4595, 4425, 4264, 4104, 3946, |
| 3788, 3640, 3493, 3355, 3218, 3090, 2963, 2842, 2721, 2609, |
| 2498, 2395, 2292, 2196, 2100, 2004, 1908, 1820, 1732, 1651, |
| 1570, 1497, 1424, 1355, 1287, 1223, 1161, 1100, 1044, 988, |
| 938, 888, 839, 790, 746, 702, 662, 623, 588, 553, |
| 520, 488, 459, 431, 405, 380, 357, 334, 311, 288, |
| 268, 248, 230, 213, 197, 182, 168, 154, 142, 130, |
| 119, 108, 99, 90, 81, 72, 64, 56, 49, 42, |
| 36, 30, 25, 20, 15, 11, 7, 3, 0 |
| }, |
| { |
| 16384, 16080, 15776, 15473, 15170, 14868, 14567, 14268, 13970, 13674, |
| 13378, 13086, 12794, 12505, 12218, 11936, 11654, 11373, 11092, 10818, |
| 10544, 10276, 10008, 9749, 9490, 9236, 8982, 8737, 8492, 8256, |
| 8020, 7792, 7564, 7336, 7108, 6888, 6669, 6459, 6249, 6050, |
| 5852, 5660, 5468, 5286, 5104, 4931, 4760, 4598, 4436, 4275, |
| 4115, 3965, 3816, 3674, 3534, 3403, 3272, 3147, 3023, 2907, |
| 2792, 2684, 2577, 2476, 2375, 2274, 2173, 2079, 1986, 1897, |
| 1810, 1724, 1645, 1567, 1493, 1419, 1351, 1284, 1222, 1161, |
| 1105, 1050, 995, 941, 891, 842, 797, 753, 713, 673, |
| 636, 599, 566, 533, 503, 473, 446, 419, 392, 365, |
| 340, 316, 294, 272, 253, 234, 216, 199, 184, 169, |
| 155, 142, 130, 118, 106, 95, 85, 75, 66, 57, |
| 49, 41, 34, 27, 21, 15, 10, 5, 0 |
| }, |
| { |
| 16384, 16092, 15801, 15510, 15219, 14930, 14641, 14355, 14069, 13785, |
| 13501, 13219, 12938, 12661, 12384, 12112, 11841, 11571, 11301, 11037, |
| 10773, 10514, 10256, 10005, 9754, 9508, 9263, 9025, 8787, 8557, |
| 8327, 8103, 7879, 7655, 7431, 7215, 7000, 6792, 6585, 6387, |
| 6190, 5998, 5807, 5625, 5445, 5272, 5100, 4937, 4774, 4613, |
| 4452, 4301, 4150, 4007, 3865, 3731, 3597, 3469, 3341, 3218, |
| 3099, 2981, 2869, 2758, 2652, 2546, 2440, 2334, 2234, 2134, |
| 2041, 1949, 1864, 1779, 1699, 1620, 1547, 1474, 1407, 1340, |
| 1278, 1217, 1157, 1097, 1043, 989, 940, 891, 846, 801, |
| 759, 718, 680, 643, 609, 575, 543, 511, 479, 447, |
| 418, 389, 363, 337, 314, 291, 270, 249, 230, 212, |
| 195, 179, 164, 149, 135, 121, 108, 96, 85, 74, |
| 64, 54, 45, 36, 28, 20, 13, 6, 0 |
| } |
| }; |
| |
| |
| static const uint16_t cf_tables_2[8][193] = { |
| { |
| 16384, 16104, 15825, 15546, 15268, 14991, 14714, 14439, 14164, 13891, |
| 13620, 13350, 13081, 12815, 12549, 12287, 12025, 11765, 11505, 11250, |
| 10996, 10746, 10497, 10254, 10011, 9772, 9534, 9303, 9072, 8848, |
| 8624, 8406, 8188, 7970, 7752, 7539, 7327, 7123, 6919, 6724, |
| 6529, 6339, 6150, 5970, 5790, 5618, 5446, 5282, 5119, 4957, |
| 4795, 4642, 4490, 4345, 4201, 4065, 3929, 3798, 3669, 3547, |
| 3425, 3310, 3196, 3086, 2976, 2866, 2756, 2650, 2545, 2447, |
| 2350, 2260, 2170, 2085, 2000, 1921, 1843, 1770, 1698, 1632, |
| 1566, 1501, 1436, 1376, 1316, 1261, 1207, 1157, 1108, 1061, |
| 1015, 973, 931, 893, 855, 819, 783, 747, 711, 677, |
| 644, 614, 584, 557, 530, 505, 480, 458, 436, 416, |
| 396, 378, 360, 343, 326, 310, 295, 281, 267, 255, |
| 243, 232, 221, 211, 201, 192, 183, 174, 166, 158, |
| 150, 142, 134, 126, 119, 112, 106, 100, 95, 90, |
| 85, 80, 76, 72, 69, 66, 63, 60, 57, 54, |
| 51, 48, 46, 44, 42, 40, 38, 36, 34, 33, |
| 32, 31, 30, 29, 28, 27, 26, 25, 24, 23, |
| 22, 21, 20, 19, 18, 17, 16, 15, 14, 13, |
| 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, |
| 2, 1, 0 |
| }, |
| { |
| 16384, 16116, 15849, 15582, 15316, 15050, 14785, 14521, 14257, 13995, |
| 13734, 13476, 13218, 12963, 12708, 12457, 12206, 11956, 11706, 11460, |
| 11215, 10975, 10735, 10500, 10265, 10034, 9803, 9579, 9355, 9136, |
| 8917, 8703, 8489, 8275, 8061, 7853, 7645, 7444, 7244, 7051, |
| 6858, 6671, 6484, 6305, 6127, 5956, 5785, 5622, 5459, 5298, |
| 5137, 4983, 4830, 4684, 4539, 4401, 4263, 4131, 3999, 3874, |
| 3750, 3632, 3515, 3401, 3287, 3173, 3059, 2949, 2840, 2737, |
| 2635, 2539, 2444, 2354, 2264, 2181, 2098, 2020, 1943, 1872, |
| 1801, 1731, 1661, 1596, 1532, 1472, 1412, 1357, 1303, 1251, |
| 1200, 1153, 1106, 1063, 1020, 979, 938, 897, 856, 818, |
| 780, 746, 712, 681, 650, 621, 592, 566, 540, 517, |
| 494, 473, 452, 431, 410, 391, 373, 356, 340, 325, |
| 310, 296, 282, 270, 258, 247, 236, 225, 214, 203, |
| 192, 182, 172, 162, 153, 144, 136, 128, 121, 114, |
| 108, 102, 97, 92, 87, 82, 77, 73, 69, 65, |
| 62, 59, 56, 53, 50, 47, 45, 43, 41, 39, |
| 37, 35, 33, 31, 29, 27, 26, 25, 24, 23, |
| 22, 21, 20, 19, 18, 17, 16, 15, 14, 13, |
| 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, |
| 2, 1, 0 |
| }, |
| { |
| 16384, 16128, 15872, 15617, 15362, 15107, 14853, 14600, 14347, 14096, |
| 13846, 13597, 13350, 13105, 12860, 12618, 12376, 12135, 11894, 11657, |
| 11421, 11189, 10957, 10730, 10503, 10279, 10056, 9838, 9620, 9407, |
| 9195, 8987, 8779, 8571, 8363, 8159, 7955, 7758, 7561, 7371, |
| 7182, 6997, 6812, 6635, 6459, 6289, 6120, 5957, 5795, 5634, |
| 5473, 5319, 5165, 5018, 4871, 4732, 4593, 4458, 4324, 4197, |
| 4071, 3951, 3831, 3714, 3597, 3480, 3363, 3250, 3138, 3032, |
| 2927, 2828, 2729, 2635, 2541, 2453, 2366, 2284, 2202, 2126, |
| 2050, 1975, 1900, 1830, 1761, 1697, 1633, 1574, 1515, 1459, |
| 1403, 1351, 1300, 1252, 1205, 1160, 1115, 1070, 1025, 982, |
| 939, 899, 860, 824, 789, 756, 723, 693, 663, 636, |
| 609, 584, 559, 535, 511, 489, 467, 447, 427, 409, |
| 391, 374, 358, 343, 328, 313, 300, 287, 274, 261, |
| 248, 235, 223, 211, 200, 189, 179, 169, 160, 151, |
| 143, 135, 128, 121, 115, 109, 103, 97, 92, 87, |
| 82, 77, 73, 69, 65, 61, 58, 55, 52, 49, |
| 46, 43, 40, 37, 35, 33, 31, 29, 27, 25, |
| 23, 21, 20, 19, 18, 17, 16, 15, 14, 13, |
| 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, |
| 2, 1, 0 |
| }, |
| { |
| 16384, 16139, 15894, 15649, 15405, 15162, 14919, 14677, 14435, 14195, |
| 13955, 13717, 13479, 13243, 13008, 12775, 12542, 12310, 12079, 11851, |
| 11623, 11399, 11176, 10956, 10737, 10521, 10305, 10094, 9883, 9677, |
| 9471, 9268, 9065, 8862, 8659, 8459, 8260, 8067, 7874, 7688, |
| 7502, 7321, 7140, 6965, 6790, 6621, 6452, 6290, 6128, 5968, |
| 5808, 5655, 5503, 5356, 5209, 5069, 4929, 4794, 4660, 4532, |
| 4404, 4282, 4160, 4041, 3922, 3803, 3684, 3568, 3452, 3343, |
| 3234, 3131, 3029, 2931, 2833, 2741, 2649, 2563, 2477, 2396, |
| 2316, 2236, 2157, 2083, 2009, 1940, 1871, 1807, 1743, 1683, |
| 1623, 1567, 1511, 1459, 1407, 1357, 1307, 1257, 1207, 1159, |
| 1111, 1067, 1023, 983, 943, 905, 868, 834, 800, 769, |
| 738, 709, 681, 653, 625, 600, 575, 552, 529, 508, |
| 487, 466, 447, 428, 410, 392, 376, 360, 344, 328, |
| 313, 298, 283, 268, 255, 242, 230, 218, 207, 196, |
| 186, 176, 167, 158, 150, 142, 135, 128, 121, 114, |
| 108, 102, 97, 92, 87, 82, 78, 74, 70, 66, |
| 62, 58, 54, 50, 47, 44, 41, 38, 35, 32, |
| 30, 28, 26, 24, 22, 20, 18, 16, 14, 13, |
| 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, |
| 2, 1, 0 |
| }, |
| { |
| 16384, 16149, 15915, 15681, 15447, 15214, 14981, 14749, 14517, 14286, |
| 14055, 13827, 13599, 13373, 13147, 12923, 12699, 12476, 12253, 12034, |
| 11815, 11599, 11383, 11171, 10959, 10750, 10541, 10337, 10133, 9933, |
| 9733, 9536, 9339, 9142, 8945, 8751, 8557, 8369, 8181, 7998, |
| 7816, 7638, 7460, 7288, 7116, 6950, 6785, 6625, 6465, 6306, |
| 6147, 5995, 5843, 5697, 5551, 5411, 5271, 5135, 5000, 4871, |
| 4742, 4618, 4495, 4374, 4253, 4132, 4011, 3893, 3775, 3663, |
| 3552, 3446, 3340, 3239, 3138, 3043, 2948, 2858, 2768, 2684, |
| 2600, 2516, 2433, 2355, 2278, 2205, 2133, 2065, 1997, 1932, |
| 1867, 1807, 1747, 1690, 1634, 1580, 1526, 1472, 1418, 1366, |
| 1314, 1266, 1218, 1174, 1130, 1088, 1047, 1009, 971, 936, |
| 901, 868, 836, 804, 772, 743, 714, 685, 658, 631, |
| 606, 582, 559, 536, 515, 494, 475, 456, 437, 418, |
| 399, 380, 362, 344, 328, 312, 297, 283, 270, 257, |
| 245, 233, 222, 211, 201, 191, 181, 172, 163, 155, |
| 147, 139, 132, 125, 119, 113, 107, 101, 96, 91, |
| 86, 81, 76, 71, 66, 62, 58, 54, 50, 46, |
| 43, 40, 37, 34, 31, 28, 26, 24, 22, 20, |
| 18, 16, 14, 12, 10, 8, 6, 5, 4, 3, |
| 2, 1, 0 |
| }, |
| { |
| 16384, 16159, 15934, 15709, 15485, 15261, 15038, 14816, 14594, 14373, |
| 14152, 13933, 13714, 13497, 13280, 13065, 12850, 12636, 12422, 12211, |
| 12000, 11791, 11583, 11378, 11173, 10971, 10769, 10571, 10373, 10179, |
| 9985, 9793, 9601, 9409, 9217, 9029, 8842, 8658, 8475, 8297, |
| 8120, 7946, 7773, 7604, 7435, 7271, 7108, 6950, 6792, 6634, |
| 6477, 6326, 6175, 6029, 5883, 5742, 5602, 5466, 5330, 5199, |
| 5068, 4943, 4818, 4696, 4574, 4452, 4330, 4211, 4093, 3979, |
| 3866, 3759, 3652, 3549, 3446, 3348, 3250, 3157, 3065, 2977, |
| 2889, 2802, 2716, 2634, 2553, 2476, 2399, 2326, 2254, 2185, |
| 2117, 2052, 1987, 1926, 1866, 1808, 1750, 1692, 1634, 1578, |
| 1522, 1470, 1418, 1369, 1321, 1275, 1229, 1187, 1145, 1105, |
| 1066, 1027, 991, 955, 919, 883, 850, 817, 786, 756, |
| 728, 700, 674, 648, 624, 600, 578, 556, 534, 512, |
| 490, 468, 447, 426, 407, 388, 371, 354, 338, 322, |
| 307, 293, 280, 267, 255, 243, 231, 219, 209, 199, |
| 189, 179, 170, 161, 153, 145, 138, 131, 124, 117, |
| 111, 105, 99, 93, 87, 81, 76, 71, 66, 61, |
| 57, 53, 49, 45, 42, 39, 36, 33, 30, 27, |
| 24, 21, 19, 17, 15, 13, 11, 9, 7, 5, |
| 3, 1, 0 |
| }, |
| { |
| 16384, 16169, 15954, 15739, 15524, 15310, 15096, 14883, 14670, 14458, |
| 14246, 14035, 13824, 13614, 13405, 13198, 12991, 12785, 12579, 12376, |
| 12173, 11972, 11772, 11574, 11377, 11182, 10987, 10795, 10603, 10414, |
| 10226, 10040, 9854, 9668, 9482, 9299, 9116, 8937, 8759, 8585, |
| 8411, 8241, 8071, 7906, 7741, 7580, 7419, 7263, 7107, 6952, |
| 6797, 6647, 6497, 6353, 6209, 6070, 5931, 5796, 5661, 5531, |
| 5401, 5275, 5150, 5027, 4904, 4781, 4658, 4538, 4419, 4304, |
| 4190, 4081, 3972, 3867, 3762, 3662, 3562, 3467, 3372, 3281, |
| 3191, 3101, 3012, 2928, 2844, 2764, 2684, 2608, 2533, 2460, |
| 2387, 2318, 2250, 2185, 2121, 2059, 1997, 1935, 1873, 1813, |
| 1754, 1698, 1642, 1588, 1535, 1483, 1433, 1384, 1338, 1292, |
| 1249, 1206, 1165, 1125, 1085, 1045, 1008, 971, 937, 903, |
| 871, 840, 810, 780, 752, 724, 698, 672, 647, 622, |
| 597, 572, 548, 524, 502, 480, 460, 440, 421, 403, |
| 386, 369, 353, 337, 323, 309, 295, 281, 268, 255, |
| 243, 231, 220, 209, 199, 189, 180, 171, 163, 155, |
| 147, 139, 131, 123, 116, 109, 102, 95, 89, 83, |
| 77, 72, 67, 62, 57, 52, 48, 44, 40, 36, |
| 32, 28, 25, 22, 19, 16, 13, 10, 8, 6, |
| 4, 2, 0 |
| }, |
| { |
| 16384, 16177, 15970, 15764, 15558, 15353, 15148, 14944, 14740, 14537, |
| 14334, 14132, 13930, 13729, 13529, 13330, 13131, 12933, 12735, 12539, |
| 12343, 12150, 11957, 11766, 11576, 11388, 11200, 11015, 10830, 10647, |
| 10465, 10285, 10105, 9925, 9745, 9568, 9391, 9218, 9045, 8876, |
| 8707, 8541, 8375, 8213, 8051, 7894, 7737, 7583, 7429, 7277, |
| 7125, 6977, 6830, 6687, 6544, 6406, 6268, 6133, 5998, 5868, |
| 5738, 5612, 5487, 5364, 5241, 5118, 4995, 4875, 4755, 4640, |
| 4525, 4414, 4304, 4198, 4092, 3990, 3888, 3790, 3693, 3600, |
| 3507, 3415, 3323, 3235, 3147, 3064, 2981, 2902, 2823, 2746, |
| 2670, 2594, 2522, 2450, 2382, 2314, 2248, 2182, 2116, 2050, |
| 1987, 1924, 1864, 1804, 1748, 1692, 1638, 1585, 1534, 1484, |
| 1437, 1390, 1346, 1302, 1258, 1215, 1174, 1133, 1095, 1057, |
| 1021, 986, 952, 918, 887, 856, 827, 798, 770, 742, |
| 714, 686, 659, 632, 607, 582, 559, 536, 514, 492, |
| 472, 452, 433, 415, 398, 381, 364, 348, 333, 318, |
| 304, 290, 277, 264, 252, 240, 229, 218, 208, 198, |
| 188, 178, 168, 158, 149, 140, 132, 124, 116, 108, |
| 101, 94, 87, 81, 75, 69, 64, 59, 54, 49, |
| 44, 39, 35, 31, 27, 23, 19, 15, 12, 9, |
| 6, 3, 0 |
| } |
| }; |
| |
| |
| static const uint16_t cf_tables_3[5][257] = { |
| { |
| 16384, 16187, 15990, 15793, 15597, 15401, 15205, 15009, 14813, 14618, |
| 14423, 14230, 14037, 13845, 13653, 13463, 13273, 13083, 12894, 12706, |
| 12518, 12332, 12146, 11962, 11778, 11597, 11416, 11237, 11059, 10882, |
| 10706, 10532, 10358, 10184, 10010, 9838, 9666, 9497, 9328, 9163, |
| 8999, 8837, 8675, 8517, 8359, 8205, 8051, 7901, 7751, 7602, |
| 7453, 7308, 7163, 7022, 6882, 6745, 6609, 6476, 6343, 6214, |
| 6085, 5960, 5835, 5712, 5589, 5466, 5343, 5223, 5103, 4987, |
| 4872, 4761, 4650, 4542, 4435, 4332, 4229, 4130, 4031, 3936, |
| 3841, 3747, 3653, 3563, 3473, 3387, 3302, 3220, 3138, 3059, |
| 2980, 2905, 2830, 2759, 2688, 2619, 2550, 2481, 2412, 2345, |
| 2278, 2215, 2152, 2092, 2032, 1974, 1917, 1863, 1809, 1758, |
| 1707, 1659, 1611, 1564, 1517, 1473, 1429, 1387, 1346, 1307, |
| 1268, 1230, 1193, 1158, 1123, 1090, 1058, 1026, 994, 962, |
| 930, 899, 869, 841, 813, 786, 760, 735, 710, 687, |
| 664, 643, 622, 602, 582, 562, 543, 525, 507, 490, |
| 473, 457, 442, 427, 412, 398, 385, 373, 361, 349, |
| 337, 325, 313, 301, 290, 279, 269, 259, 249, 240, |
| 231, 222, 214, 206, 199, 192, 185, 178, 171, 165, |
| 159, 153, 148, 143, 138, 133, 128, 123, 119, 115, |
| 111, 107, 103, 99, 95, 91, 87, 83, 80, 77, |
| 74, 71, 68, 65, 63, 61, 59, 57, 55, 53, |
| 51, 49, 47, 45, 43, 41, 40, 39, 38, 37, |
| 36, 35, 34, 33, 32, 31, 30, 29, 28, 27, |
| 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, |
| 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, |
| 6, 5, 4, 3, 2, 1, 0 |
| }, |
| { |
| 16384, 16195, 16006, 15817, 15629, 15441, 15253, 15065, 14878, 14692, |
| 14506, 14321, 14136, 13952, 13768, 13585, 13402, 13219, 13037, 12857, |
| 12677, 12499, 12321, 12144, 11967, 11792, 11617, 11444, 11271, 11100, |
| 10930, 10762, 10594, 10426, 10258, 10091, 9925, 9761, 9598, 9438, |
| 9278, 9120, 8963, 8809, 8655, 8504, 8354, 8207, 8060, 7914, |
| 7769, 7627, 7485, 7347, 7209, 7074, 6939, 6807, 6676, 6548, |
| 6420, 6296, 6172, 6050, 5928, 5806, 5684, 5564, 5444, 5328, |
| 5212, 5100, 4988, 4879, 4771, 4667, 4563, 4462, 4362, 4265, |
| 4169, 4073, 3978, 3886, 3795, 3707, 3619, 3535, 3451, 3369, |
| 3288, 3210, 3133, 3059, 2985, 2913, 2841, 2769, 2697, 2627, |
| 2557, 2490, 2424, 2360, 2297, 2237, 2177, 2119, 2062, 2007, |
| 1953, 1901, 1849, 1798, 1748, 1700, 1652, 1607, 1562, 1519, |
| 1476, 1435, 1394, 1355, 1317, 1281, 1245, 1210, 1175, 1140, |
| 1105, 1071, 1037, 1005, 973, 943, 913, 885, 857, 830, |
| 804, 779, 754, 731, 708, 685, 663, 642, 621, 601, |
| 581, 563, 545, 528, 511, 495, 479, 463, 448, 433, |
| 419, 405, 391, 377, 364, 351, 338, 326, 314, 302, |
| 291, 280, 270, 260, 251, 242, 234, 226, 218, 210, |
| 202, 195, 188, 181, 174, 168, 162, 156, 150, 144, |
| 139, 134, 129, 124, 119, 114, 109, 104, 100, 96, |
| 92, 88, 84, 80, 77, 74, 71, 68, 65, 62, |
| 59, 56, 54, 52, 50, 48, 46, 44, 42, 40, |
| 38, 36, 34, 33, 32, 31, 30, 29, 28, 27, |
| 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, |
| 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, |
| 6, 5, 4, 3, 2, 1, 0 |
| }, |
| { |
| 16384, 16203, 16022, 15842, 15662, 15482, 15302, 15122, 14942, 14763, |
| 14584, 14406, 14228, 14051, 13874, 13698, 13522, 13347, 13172, 12998, |
| 12824, 12652, 12480, 12310, 12140, 11971, 11803, 11637, 11471, 11307, |
| 11143, 10980, 10817, 10654, 10491, 10330, 10169, 10011, 9853, 9697, |
| 9542, 9389, 9236, 9086, 8936, 8789, 8642, 8498, 8355, 8212, |
| 8070, 7931, 7792, 7656, 7520, 7388, 7256, 7126, 6996, 6870, |
| 6744, 6621, 6498, 6377, 6256, 6135, 6014, 5895, 5776, 5660, |
| 5545, 5433, 5321, 5212, 5104, 4999, 4895, 4793, 4692, 4594, |
| 4496, 4400, 4304, 4211, 4118, 4028, 3939, 3853, 3767, 3684, |
| 3601, 3521, 3441, 3364, 3287, 3212, 3137, 3062, 2987, 2915, |
| 2843, 2773, 2704, 2638, 2572, 2508, 2445, 2384, 2324, 2266, |
| 2208, 2153, 2098, 2044, 1990, 1939, 1888, 1839, 1791, 1745, |
| 1699, 1655, 1611, 1569, 1527, 1487, 1448, 1409, 1370, 1331, |
| 1292, 1255, 1218, 1183, 1148, 1115, 1082, 1051, 1020, 990, |
| 960, 932, 904, 878, 852, 826, 801, 777, 753, 731, |
| 709, 687, 666, 645, 625, 605, 586, 567, 550, 533, |
| 516, 499, 482, 465, 449, 433, 418, 403, 389, 375, |
| 362, 349, 337, 325, 314, 303, 293, 283, 273, 263, |
| 254, 245, 236, 227, 219, 211, 204, 197, 190, 183, |
| 177, 171, 165, 159, 153, 147, 141, 135, 130, 125, |
| 120, 115, 110, 105, 101, 97, 93, 89, 85, 81, |
| 77, 74, 71, 68, 65, 62, 59, 56, 53, 51, |
| 49, 47, 45, 43, 41, 39, 37, 35, 33, 31, |
| 29, 27, 25, 23, 22, 21, 20, 19, 18, 17, |
| 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, |
| 6, 5, 4, 3, 2, 1, 0 |
| }, |
| { |
| 16384, 16210, 16036, 15863, 15690, 15517, 15344, 15172, 15000, 14828, |
| 14656, 14485, 14314, 14145, 13976, 13808, 13640, 13472, 13304, 13137, |
| 12970, 12804, 12639, 12475, 12312, 12149, 11987, 11827, 11667, 11508, |
| 11349, 11192, 11035, 10878, 10721, 10565, 10410, 10257, 10104, 9953, |
| 9802, 9654, 9506, 9359, 9213, 9070, 8927, 8787, 8647, 8508, |
| 8369, 8233, 8097, 7964, 7831, 7700, 7570, 7442, 7315, 7190, |
| 7065, 6943, 6821, 6701, 6581, 6461, 6341, 6223, 6105, 5990, |
| 5876, 5764, 5653, 5545, 5437, 5331, 5226, 5124, 5022, 4924, |
| 4826, 4729, 4632, 4538, 4444, 4353, 4262, 4174, 4087, 4002, |
| 3917, 3835, 3753, 3674, 3595, 3518, 3441, 3364, 3287, 3212, |
| 3138, 3066, 2995, 2926, 2858, 2792, 2726, 2662, 2599, 2538, |
| 2478, 2420, 2362, 2305, 2249, 2195, 2141, 2089, 2037, 1988, |
| 1939, 1891, 1844, 1799, 1754, 1711, 1668, 1626, 1584, 1542, |
| 1500, 1459, 1418, 1380, 1342, 1305, 1269, 1234, 1199, 1166, |
| 1133, 1102, 1071, 1041, 1012, 983, 954, 926, 899, 872, |
| 847, 822, 798, 774, 751, 728, 707, 686, 666, 646, |
| 627, 608, 589, 570, 552, 534, 517, 500, 484, 468, |
| 453, 438, 424, 410, 397, 384, 372, 360, 348, 336, |
| 325, 314, 303, 293, 283, 273, 264, 255, 246, 237, |
| 229, 221, 213, 205, 197, 189, 181, 174, 167, 160, |
| 154, 148, 142, 136, 131, 126, 121, 116, 111, 106, |
| 101, 97, 93, 89, 85, 81, 77, 73, 70, 67, |
| 64, 61, 58, 55, 52, 49, 46, 43, 40, 37, |
| 35, 33, 31, 29, 27, 25, 23, 21, 19, 17, |
| 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, |
| 6, 5, 4, 3, 2, 1, 0 |
| }, |
| { |
| 16384, 16218, 16052, 15886, 15720, 15554, 15389, 15224, 15059, 14895, |
| 14731, 14567, 14403, 14240, 14077, 13915, 13753, 13591, 13429, 13269, |
| 13109, 12950, 12791, 12633, 12476, 12320, 12164, 12009, 11854, 11701, |
| 11548, 11396, 11244, 11092, 10940, 10790, 10640, 10492, 10344, 10198, |
| 10052, 9908, 9764, 9622, 9481, 9342, 9203, 9066, 8929, 8793, |
| 8657, 8524, 8391, 8261, 8131, 8003, 7875, 7749, 7624, 7502, |
| 7380, 7260, 7140, 7022, 6904, 6786, 6668, 6551, 6435, 6322, |
| 6209, 6099, 5989, 5881, 5773, 5668, 5563, 5461, 5359, 5260, |
| 5161, 5063, 4965, 4871, 4777, 4686, 4595, 4506, 4417, 4331, |
| 4245, 4162, 4079, 3999, 3919, 3841, 3763, 3685, 3607, 3530, |
| 3454, 3380, 3307, 3236, 3166, 3097, 3029, 2963, 2897, 2834, |
| 2771, 2710, 2650, 2591, 2532, 2475, 2418, 2363, 2309, 2257, |
| 2205, 2155, 2105, 2057, 2009, 1963, 1918, 1873, 1828, 1783, |
| 1738, 1694, 1650, 1607, 1565, 1524, 1484, 1445, 1407, 1369, |
| 1333, 1297, 1263, 1229, 1197, 1165, 1134, 1103, 1073, 1043, |
| 1015, 987, 960, 933, 907, 882, 858, 834, 811, 788, |
| 766, 744, 722, 700, 679, 658, 638, 618, 599, 581, |
| 563, 545, 528, 511, 495, 480, 465, 451, 437, 423, |
| 410, 397, 384, 372, 360, 348, 337, 326, 315, 305, |
| 295, 285, 275, 265, 255, 245, 236, 227, 219, 211, |
| 203, 195, 188, 181, 174, 167, 161, 155, 149, 143, |
| 137, 131, 126, 121, 116, 111, 106, 101, 97, 93, |
| 89, 85, 81, 77, 73, 69, 65, 61, 58, 55, |
| 52, 49, 46, 43, 40, 37, 34, 32, 30, 28, |
| 26, 24, 22, 20, 18, 16, 14, 12, 10, 8, |
| 6, 5, 4, 3, 2, 1, 0 |
| } |
| }; |
| |
| |
| static const uint16_t *const cf_table[16] = { |
| cf_tables_1[0], cf_tables_1[1], cf_tables_1[2], cf_tables_2[0], |
| cf_tables_2[1], cf_tables_2[2], cf_tables_2[3], cf_tables_2[4], |
| cf_tables_2[5], cf_tables_2[6], cf_tables_2[7], cf_tables_3[0], |
| cf_tables_3[1], cf_tables_3[2], cf_tables_3[3], cf_tables_3[4] |
| }; |
| |
| |
| /** Initialize a given lookup table using a given delta */ |
| static void bgmc_lut_fillp(uint8_t *lut, int *lut_status, int delta) |
| { |
| unsigned int sx, i; |
| |
| for (sx = 0; sx < 16; sx++) |
| for (i = 0; i < LUT_SIZE; i++) { |
| unsigned int target = (i + 1) << (FREQ_BITS - LUT_BITS); |
| unsigned int symbol = 1 << delta; |
| |
| while (cf_table[sx][symbol] > target) |
| symbol += 1 << delta; |
| |
| *lut++ = symbol >> delta; |
| } |
| |
| *lut_status = delta; |
| } |
| |
| |
| /** Retune the index of a suitable lookup table for a given delta */ |
| static uint8_t *bgmc_lut_getp(uint8_t *lut, int *lut_status, int delta) |
| { |
| unsigned int i = av_clip(delta, 0, LUT_BUFF - 1); |
| |
| lut += (i * LUT_SIZE) << 4; |
| |
| if (lut_status[i] != delta) |
| bgmc_lut_fillp(lut, &lut_status[i], delta); |
| |
| return lut; |
| } |
| |
| |
| /** Initialize the lookup table arrays */ |
| av_cold int ff_bgmc_init(AVCodecContext *avctx, |
| uint8_t **cf_lut, int **cf_lut_status) |
| { |
| *cf_lut = av_malloc(sizeof(**cf_lut) * LUT_BUFF * 16 * LUT_SIZE); |
| *cf_lut_status = av_malloc(sizeof(**cf_lut_status) * LUT_BUFF); |
| |
| if (!*cf_lut || !*cf_lut_status) { |
| ff_bgmc_end(cf_lut, cf_lut_status); |
| av_log(avctx, AV_LOG_ERROR, "Allocating buffer memory failed.\n"); |
| return AVERROR(ENOMEM); |
| } else { |
| // initialize lut_status buffer to a value never used to compare against |
| memset(*cf_lut_status, -1, sizeof(**cf_lut_status) * LUT_BUFF); |
| } |
| |
| return 0; |
| } |
| |
| |
| /** Release the lookup table arrays */ |
| av_cold void ff_bgmc_end(uint8_t **cf_lut, int **cf_lut_status) |
| { |
| av_freep(cf_lut); |
| av_freep(cf_lut_status); |
| } |
| |
| |
| /** Initialize decoding and reads the first value */ |
| void ff_bgmc_decode_init(GetBitContext *gb, unsigned int *h, |
| unsigned int *l, unsigned int *v) |
| { |
| *h = TOP_VALUE; |
| *l = 0; |
| *v = get_bits_long(gb, VALUE_BITS); |
| } |
| |
| |
| /** Finish decoding */ |
| void ff_bgmc_decode_end(GetBitContext *gb) |
| { |
| skip_bits_long(gb, -(VALUE_BITS - 2)); |
| } |
| |
| |
| /** Read and decode a block Gilbert-Moore coded symbol */ |
| void ff_bgmc_decode(GetBitContext *gb, unsigned int num, int32_t *dst, |
| int delta, unsigned int sx, |
| unsigned int *h, unsigned int *l, unsigned int *v, |
| uint8_t *cf_lut, int *cf_lut_status) |
| { |
| unsigned int i; |
| uint8_t *lut = bgmc_lut_getp(cf_lut, cf_lut_status, delta); |
| |
| // read current state |
| unsigned int high = *h; |
| unsigned int low = *l; |
| unsigned int value = *v; |
| |
| lut += sx * LUT_SIZE; |
| |
| // decode num samples |
| for (i = 0; i < num; i++) { |
| unsigned int range = high - low + 1; |
| unsigned int target = (((value - low + 1) << FREQ_BITS) - 1) / range; |
| unsigned int symbol = lut[target >> (FREQ_BITS - LUT_BITS)] << delta; |
| |
| while (cf_table[sx][symbol] > target) |
| symbol += 1 << delta; |
| |
| symbol = (symbol >> delta) - 1; |
| |
| high = low + ((range * cf_table[sx][(symbol) << delta] - (1 << FREQ_BITS)) >> FREQ_BITS); |
| low = low + ((range * cf_table[sx][(symbol + 1) << delta]) >> FREQ_BITS); |
| |
| while (1) { |
| if (high >= HALF) { |
| if (low >= HALF) { |
| value -= HALF; |
| low -= HALF; |
| high -= HALF; |
| } else if (low >= FIRST_QTR && high < THIRD_QTR) { |
| value -= FIRST_QTR; |
| low -= FIRST_QTR; |
| high -= FIRST_QTR; |
| } else |
| break; |
| } |
| |
| low *= 2; |
| high = 2 * high + 1; |
| value = 2 * value + get_bits1(gb); |
| } |
| |
| *dst++ = symbol; |
| } |
| |
| // save current state |
| *h = high; |
| *l = low; |
| *v = value; |
| } |
