FFmpeg/libavcodec/adpcm_data.c

/*
 * Copyright (c) 2001-2003 The FFmpeg project
 *
 * 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
 * ADPCM tables
 */

#include <stdint.h>

/* ff_adpcm_step_table[] and ff_adpcm_index_table[] are from the ADPCM
   reference source */
static const int8_t adpcm_index_table2[4] = {
    -1,  2,
    -1,  2,
};

static const int8_t adpcm_index_table3[8] = {
    -1, -1,  1,  2,
    -1, -1,  1,  2,
};

const int8_t ff_adpcm_index_table[16] = {
    -1, -1, -1, -1, 2, 4, 6, 8,
    -1, -1, -1, -1, 2, 4, 6, 8,
};

static const int8_t adpcm_index_table5[32] = {
    -1, -1, -1, -1, -1, -1, -1, -1, 1, 2, 4, 6, 8, 10, 13, 16,
    -1, -1, -1, -1, -1, -1, -1, -1, 1, 2, 4, 6, 8, 10, 13, 16,
};

const int8_t * const ff_adpcm_index_tables[4] = {
    &adpcm_index_table2[0],
    &adpcm_index_table3[0],
    &ff_adpcm_index_table[0],
    &adpcm_index_table5[0],
};

/**
 * This is the step table. Note that many programs use slight deviations from
 * this table, but such deviations are negligible:
 */
const int16_t ff_adpcm_step_table[89] = {
        7,     8,     9,    10,    11,    12,    13,    14,    16,    17,
       19,    21,    23,    25,    28,    31,    34,    37,    41,    45,
       50,    55,    60,    66,    73,    80,    88,    97,   107,   118,
      130,   143,   157,   173,   190,   209,   230,   253,   279,   307,
      337,   371,   408,   449,   494,   544,   598,   658,   724,   796,
      876,   963,  1060,  1166,  1282,  1411,  1552,  1707,  1878,  2066,
     2272,  2499,  2749,  3024,  3327,  3660,  4026,  4428,  4871,  5358,
     5894,  6484,  7132,  7845,  8630,  9493, 10442, 11487, 12635, 13899,
    15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794, 32767
};

const int16_t ff_adpcm_oki_step_table[49] = {
     16,  17,  19,  21,   23,   25,   28,   31,   34,  37,
     41,  45,  50,  55,   60,   66,   73,   80,   88,  97,
    107, 118, 130, 143,  157,  173,  190,  209,  230, 253,
    279, 307, 337, 371,  408,  449,  494,  544,  598, 658,
    724, 796, 876, 963, 1060, 1166, 1282, 1411, 1552
};

/* These are for MS-ADPCM */
/* ff_adpcm_AdaptationTable[], ff_adpcm_AdaptCoeff1[], and
   ff_adpcm_AdaptCoeff2[] are from libsndfile */
const int16_t ff_adpcm_AdaptationTable[] = {
    230, 230, 230, 230, 307, 409, 512, 614,
    768, 614, 512, 409, 307, 230, 230, 230
};

/** Divided by 4 to fit in 8-bit integers */
const uint8_t ff_adpcm_AdaptCoeff1[] = {
    64, 128, 0, 48, 60, 115, 98
};

/** Divided by 4 to fit in 8-bit integers */
const int8_t ff_adpcm_AdaptCoeff2[] = {
    0, -64, 0, 16, 0, -52, -58
};

const int16_t ff_adpcm_yamaha_indexscale[] = {
    230, 230, 230, 230, 307, 409, 512, 614,
    230, 230, 230, 230, 307, 409, 512, 614
};

const int8_t ff_adpcm_yamaha_difflookup[] = {
     1,  3,  5,  7,  9,  11,  13,  15,
    -1, -3, -5, -7, -9, -11, -13, -15
};

const uint16_t ff_adpcm_afc_coeffs[2][16] = {
    { 0, 2048, 0, 1024, 4096, 3584, 3072, 4608, 4200, 4800, 5120, 2048, 1024, 64512, 64512, 63488 },
    { 0, 0, 2048, 1024, 63488, 64000, 64512, 62976, 63288, 63236, 62464, 63488, 64512, 1024, 0, 0 }
};

const int16_t ff_adpcm_mtaf_stepsize[32][16] = {
    {     1,     5,     9,    13,    16,    20,    24,    28,
         -1,    -5,    -9,   -13,   -16,   -20,   -24,   -28, },
    {     2,     6,    11,    15,    20,    24,    29,    33,
         -2,    -6,   -11,   -15,   -20,   -24,   -29,   -33, },
    {     2,     7,    13,    18,    23,    28,    34,    39,
         -2,    -7,   -13,   -18,   -23,   -28,   -34,   -39, },
    {     3,     9,    15,    21,    28,    34,    40,    46,
         -3,    -9,   -15,   -21,   -28,   -34,   -40,   -46, },
    {     3,    11,    18,    26,    33,    41,    48,    56,
         -3,   -11,   -18,   -26,   -33,   -41,   -48,   -56, },
    {     4,    13,    22,    31,    40,    49,    58,    67,
         -4,   -13,   -22,   -31,   -40,   -49,   -58,   -67, },
    {     5,    16,    26,    37,    48,    59,    69,    80,
         -5,   -16,   -26,   -37,   -48,   -59,   -69,   -80, },
    {     6,    19,    31,    44,    57,    70,    82,    95,
         -6,   -19,   -31,   -44,   -57,   -70,   -82,   -95, },
    {     7,    22,    38,    53,    68,    83,    99,   114,
         -7,   -22,   -38,   -53,   -68,   -83,   -99,  -114, },
    {     9,    27,    45,    63,    81,    99,   117,   135,
         -9,   -27,   -45,   -63,   -81,   -99,  -117,  -135, },
    {    10,    32,    53,    75,    96,   118,   139,   161,
        -10,   -32,   -53,   -75,   -96,  -118,  -139,  -161, },
    {    12,    38,    64,    90,   115,   141,   167,   193,
        -12,   -38,   -64,   -90,  -115,  -141,  -167,  -193, },
    {    15,    45,    76,   106,   137,   167,   198,   228,
        -15,   -45,   -76,  -106,  -137,  -167,  -198,  -228, },
    {    18,    54,    91,   127,   164,   200,   237,   273,
        -18,   -54,   -91,  -127,  -164,  -200,  -237,  -273, },
    {    21,    65,   108,   152,   195,   239,   282,   326,
        -21,   -65,  -108,  -152,  -195,  -239,  -282,  -326, },
    {    25,    77,   129,   181,   232,   284,   336,   388,
        -25,   -77,  -129,  -181,  -232,  -284,  -336,  -388, },
    {    30,    92,   153,   215,   276,   338,   399,   461,
        -30,   -92,  -153,  -215,  -276,  -338,  -399,  -461, },
    {    36,   109,   183,   256,   329,   402,   476,   549,
        -36,  -109,  -183,  -256,  -329,  -402,  -476,  -549, },
    {    43,   130,   218,   305,   392,   479,   567,   654,
        -43,  -130,  -218,  -305,  -392,  -479,  -567,  -654, },
    {    52,   156,   260,   364,   468,   572,   676,   780,
        -52,  -156,  -260,  -364,  -468,  -572,  -676,  -780, },
    {    62,   186,   310,   434,   558,   682,   806,   930,
        -62,  -186,  -310,  -434,  -558,  -682,  -806,  -930, },
    {    73,   221,   368,   516,   663,   811,   958,  1106,
        -73,  -221,  -368,  -516,  -663,  -811,  -958, -1106, },
    {    87,   263,   439,   615,   790,   966,  1142,  1318,
        -87,  -263,  -439,  -615,  -790,  -966, -1142, -1318, },
    {   104,   314,   523,   733,   942,  1152,  1361,  1571,
       -104,  -314,  -523,  -733,  -942, -1152, -1361, -1571, },
    {   124,   374,   623,   873,  1122,  1372,  1621,  1871,
       -124,  -374,  -623,  -873, -1122, -1372, -1621, -1871, },
    {   148,   445,   743,  1040,  1337,  1634,  1932,  2229,
       -148,  -445,  -743, -1040, -1337, -1634, -1932, -2229, },
    {   177,   531,   885,  1239,  1593,  1947,  2301,  2655,
       -177,  -531,  -885, -1239, -1593, -1947, -2301, -2655, },
    {   210,   632,  1053,  1475,  1896,  2318,  2739,  3161,
       -210,  -632, -1053, -1475, -1896, -2318, -2739, -3161, },
    {   251,   753,  1255,  1757,  2260,  2762,  3264,  3766,
       -251,  -753, -1255, -1757, -2260, -2762, -3264, -3766, },
    {   299,   897,  1495,  2093,  2692,  3290,  3888,  4486,
       -299,  -897, -1495, -2093, -2692, -3290, -3888, -4486, },
    {   356,  1068,  1781,  2493,  3206,  3918,  4631,  5343,
       -356, -1068, -1781, -2493, -3206, -3918, -4631, -5343, },
    {   424,  1273,  2121,  2970,  3819,  4668,  5516,  6365,
       -424, -1273, -2121, -2970, -3819, -4668, -5516, -6365, },
};