/* * 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 */ /* This is the index table: */ 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 }; 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 int16_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 } };