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