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