| /* | |
| * 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 | |
| */ | |
| /* 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 | |
| }; | |