1/*
2 * Copyright (c) 2001-2003 The FFmpeg project
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21/**
22 * @file
23 * ADPCM tables
24 */
25
26#include <stdint.h>
27
28/* ff_adpcm_step_table[] and ff_adpcm_index_table[] are from the ADPCM
29   reference source */
30const int8_t ff_adpcm_index_table[16] = {
31    -1, -1, -1, -1, 2, 4, 6, 8,
32    -1, -1, -1, -1, 2, 4, 6, 8,
33};
34
35/**
36 * This is the step table. Note that many programs use slight deviations from
37 * this table, but such deviations are negligible:
38 */
39const int16_t ff_adpcm_step_table[89] = {
40        7,     8,     9,    10,    11,    12,    13,    14,    16,    17,
41       19,    21,    23,    25,    28,    31,    34,    37,    41,    45,
42       50,    55,    60,    66,    73,    80,    88,    97,   107,   118,
43      130,   143,   157,   173,   190,   209,   230,   253,   279,   307,
44      337,   371,   408,   449,   494,   544,   598,   658,   724,   796,
45      876,   963,  1060,  1166,  1282,  1411,  1552,  1707,  1878,  2066,
46     2272,  2499,  2749,  3024,  3327,  3660,  4026,  4428,  4871,  5358,
47     5894,  6484,  7132,  7845,  8630,  9493, 10442, 11487, 12635, 13899,
48    15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794, 32767
49};
50
51/* These are for MS-ADPCM */
52/* ff_adpcm_AdaptationTable[], ff_adpcm_AdaptCoeff1[], and
53   ff_adpcm_AdaptCoeff2[] are from libsndfile */
54const int16_t ff_adpcm_AdaptationTable[] = {
55    230, 230, 230, 230, 307, 409, 512, 614,
56    768, 614, 512, 409, 307, 230, 230, 230
57};
58
59/** Divided by 4 to fit in 8-bit integers */
60const uint8_t ff_adpcm_AdaptCoeff1[] = {
61    64, 128, 0, 48, 60, 115, 98
62};
63
64/** Divided by 4 to fit in 8-bit integers */
65const int8_t ff_adpcm_AdaptCoeff2[] = {
66    0, -64, 0, 16, 0, -52, -58
67};
68
69const int16_t ff_adpcm_yamaha_indexscale[] = {
70    230, 230, 230, 230, 307, 409, 512, 614,
71    230, 230, 230, 230, 307, 409, 512, 614
72};
73
74const int8_t ff_adpcm_yamaha_difflookup[] = {
75     1,  3,  5,  7,  9,  11,  13,  15,
76    -1, -3, -5, -7, -9, -11, -13, -15
77};
78