mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-26 19:01:44 +02:00
79 lines
2.7 KiB
C
79 lines
2.7 KiB
C
/*
|
|
* Copyright (c) 2001-2003 The FFmpeg project
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav 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.
|
|
*
|
|
* Libav 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 Libav; 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
|
|
};
|
|
|
|
/* 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
|
|
};
|