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 */
30static const int8_t adpcm_index_table2[4] = {
31    -1,  2,
32    -1,  2,
33};
34
35static const int8_t adpcm_index_table3[8] = {
36    -1, -1,  1,  2,
37    -1, -1,  1,  2,
38};
39
40const int8_t ff_adpcm_index_table[16] = {
41    -1, -1, -1, -1, 2, 4, 6, 8,
42    -1, -1, -1, -1, 2, 4, 6, 8,
43};
44
45static const int8_t adpcm_index_table5[32] = {
46    -1, -1, -1, -1, -1, -1, -1, -1, 1, 2, 4, 6, 8, 10, 13, 16,
47    -1, -1, -1, -1, -1, -1, -1, -1, 1, 2, 4, 6, 8, 10, 13, 16,
48};
49
50const int8_t * const ff_adpcm_index_tables[4] = {
51    &adpcm_index_table2[0],
52    &adpcm_index_table3[0],
53    &ff_adpcm_index_table[0],
54    &adpcm_index_table5[0],
55};
56
57/**
58 * This is the step table. Note that many programs use slight deviations from
59 * this table, but such deviations are negligible:
60 */
61const int16_t ff_adpcm_step_table[89] = {
62        7,     8,     9,    10,    11,    12,    13,    14,    16,    17,
63       19,    21,    23,    25,    28,    31,    34,    37,    41,    45,
64       50,    55,    60,    66,    73,    80,    88,    97,   107,   118,
65      130,   143,   157,   173,   190,   209,   230,   253,   279,   307,
66      337,   371,   408,   449,   494,   544,   598,   658,   724,   796,
67      876,   963,  1060,  1166,  1282,  1411,  1552,  1707,  1878,  2066,
68     2272,  2499,  2749,  3024,  3327,  3660,  4026,  4428,  4871,  5358,
69     5894,  6484,  7132,  7845,  8630,  9493, 10442, 11487, 12635, 13899,
70    15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794, 32767
71};
72
73const int16_t ff_adpcm_oki_step_table[49] = {
74     16,  17,  19,  21,   23,   25,   28,   31,   34,  37,
75     41,  45,  50,  55,   60,   66,   73,   80,   88,  97,
76    107, 118, 130, 143,  157,  173,  190,  209,  230, 253,
77    279, 307, 337, 371,  408,  449,  494,  544,  598, 658,
78    724, 796, 876, 963, 1060, 1166, 1282, 1411, 1552
79};
80
81/* These are for MS-ADPCM */
82/* ff_adpcm_AdaptationTable[], ff_adpcm_AdaptCoeff1[], and
83   ff_adpcm_AdaptCoeff2[] are from libsndfile */
84const int16_t ff_adpcm_AdaptationTable[] = {
85    230, 230, 230, 230, 307, 409, 512, 614,
86    768, 614, 512, 409, 307, 230, 230, 230
87};
88
89/** Divided by 4 to fit in 8-bit integers */
90const uint8_t ff_adpcm_AdaptCoeff1[] = {
91    64, 128, 0, 48, 60, 115, 98
92};
93
94/** Divided by 4 to fit in 8-bit integers */
95const int8_t ff_adpcm_AdaptCoeff2[] = {
96    0, -64, 0, 16, 0, -52, -58
97};
98
99const int16_t ff_adpcm_yamaha_indexscale[] = {
100    230, 230, 230, 230, 307, 409, 512, 614,
101    230, 230, 230, 230, 307, 409, 512, 614
102};
103
104const int8_t ff_adpcm_yamaha_difflookup[] = {
105     1,  3,  5,  7,  9,  11,  13,  15,
106    -1, -3, -5, -7, -9, -11, -13, -15
107};
108
109const int16_t ff_adpcm_afc_coeffs[2][16] = {
110    { 0, 2048, 0, 1024, 4096, 3584, 3072, 4608, 4200, 4800, 5120, 2048, 1024, 64512, 64512, 63488 },
111    { 0, 0, 2048, 1024, 63488, 64000, 64512, 62976, 63288, 63236, 62464, 63488, 64512, 1024, 0, 0 }
112};
113