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  1. /*
  2.  * Copyright (c) 2001-2003 The ffmpeg Project
  3.  *
  4.  * This file is part of FFmpeg.
  5.  *
  6.  * FFmpeg is free software; you can redistribute it and/or
  7.  * modify it under the terms of the GNU Lesser General Public
  8.  * License as published by the Free Software Foundation; either
  9.  * version 2.1 of the License, or (at your option) any later version.
  10.  *
  11.  * FFmpeg is distributed in the hope that it will be useful,
  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14.  * Lesser General Public License for more details.
  15.  *
  16.  * You should have received a copy of the GNU Lesser General Public
  17.  * License along with FFmpeg; if not, write to the Free Software
  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19.  */
  20.  
  21. /**
  22.  * @file
  23.  * ADPCM tables
  24.  */
  25.  
  26. #include <stdint.h>
  27.  
  28. /* ff_adpcm_step_table[] and ff_adpcm_index_table[] are from the ADPCM
  29.    reference source */
  30. static const int8_t adpcm_index_table2[4] = {
  31.     -1,  2,
  32.     -1,  2,
  33. };
  34.  
  35. static const int8_t adpcm_index_table3[8] = {
  36.     -1, -1,  1,  2,
  37.     -1, -1,  1,  2,
  38. };
  39.  
  40. const int8_t ff_adpcm_index_table[16] = {
  41.     -1, -1, -1, -1, 2, 4, 6, 8,
  42.     -1, -1, -1, -1, 2, 4, 6, 8,
  43. };
  44.  
  45. static const int8_t adpcm_index_table5[32] = {
  46.     -1, -1, -1, -1, -1, -1, -1, -1, 1, 2, 4, 6, 8, 10, 13, 16,
  47.     -1, -1, -1, -1, -1, -1, -1, -1, 1, 2, 4, 6, 8, 10, 13, 16,
  48. };
  49.  
  50. const int8_t const *ff_adpcm_index_tables[4] = {
  51.     &adpcm_index_table2[0],
  52.     &adpcm_index_table3[0],
  53.     &ff_adpcm_index_table[0],
  54.     &adpcm_index_table5[0],
  55. };
  56.  
  57. /**
  58.  * This is the step table. Note that many programs use slight deviations from
  59.  * this table, but such deviations are negligible:
  60.  */
  61. const int16_t ff_adpcm_step_table[89] = {
  62.         7,     8,     9,    10,    11,    12,    13,    14,    16,    17,
  63.        19,    21,    23,    25,    28,    31,    34,    37,    41,    45,
  64.        50,    55,    60,    66,    73,    80,    88,    97,   107,   118,
  65.       130,   143,   157,   173,   190,   209,   230,   253,   279,   307,
  66.       337,   371,   408,   449,   494,   544,   598,   658,   724,   796,
  67.       876,   963,  1060,  1166,  1282,  1411,  1552,  1707,  1878,  2066,
  68.      2272,  2499,  2749,  3024,  3327,  3660,  4026,  4428,  4871,  5358,
  69.      5894,  6484,  7132,  7845,  8630,  9493, 10442, 11487, 12635, 13899,
  70.     15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794, 32767
  71. };
  72.  
  73. const int16_t ff_adpcm_oki_step_table[49] = {
  74.      16,  17,  19,  21,   23,   25,   28,   31,   34,  37,
  75.      41,  45,  50,  55,   60,   66,   73,   80,   88,  97,
  76.     107, 118, 130, 143,  157,  173,  190,  209,  230, 253,
  77.     279, 307, 337, 371,  408,  449,  494,  544,  598, 658,
  78.     724, 796, 876, 963, 1060, 1166, 1282, 1411, 1552
  79. };
  80.  
  81. /* These are for MS-ADPCM */
  82. /* ff_adpcm_AdaptationTable[], ff_adpcm_AdaptCoeff1[], and
  83.    ff_adpcm_AdaptCoeff2[] are from libsndfile */
  84. const int16_t ff_adpcm_AdaptationTable[] = {
  85.     230, 230, 230, 230, 307, 409, 512, 614,
  86.     768, 614, 512, 409, 307, 230, 230, 230
  87. };
  88.  
  89. /** Divided by 4 to fit in 8-bit integers */
  90. const uint8_t ff_adpcm_AdaptCoeff1[] = {
  91.     64, 128, 0, 48, 60, 115, 98
  92. };
  93.  
  94. /** Divided by 4 to fit in 8-bit integers */
  95. const int8_t ff_adpcm_AdaptCoeff2[] = {
  96.     0, -64, 0, 16, 0, -52, -58
  97. };
  98.  
  99. const int16_t ff_adpcm_yamaha_indexscale[] = {
  100.     230, 230, 230, 230, 307, 409, 512, 614,
  101.     230, 230, 230, 230, 307, 409, 512, 614
  102. };
  103.  
  104. const int8_t ff_adpcm_yamaha_difflookup[] = {
  105.      1,  3,  5,  7,  9,  11,  13,  15,
  106.     -1, -3, -5, -7, -9, -11, -13, -15
  107. };
  108.  
  109. const int16_t ff_adpcm_afc_coeffs[2][16] = {
  110.     { 0, 2048, 0, 1024, 4096, 3584, 3072, 4608, 4200, 4800, 5120, 2048, 1024, 64512, 64512, 63488 },
  111.     { 0, 0, 2048, 1024, 63488, 64000, 64512, 62976, 63288, 63236, 62464, 63488, 64512, 1024, 0, 0 }
  112. };
  113.