adpcm_data.c
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1 /*
2  * Copyright (c) 2001-2003 The ffmpeg Project
3  *
4  * This file is part of Libav.
5  *
6  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
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 
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 /* These are for MS-ADPCM */
53 /* ff_adpcm_AdaptationTable[], ff_adpcm_AdaptCoeff1[], and
54  ff_adpcm_AdaptCoeff2[] are from libsndfile */
55 const int16_t ff_adpcm_AdaptationTable[] = {
56  230, 230, 230, 230, 307, 409, 512, 614,
57  768, 614, 512, 409, 307, 230, 230, 230
58 };
59 
61 const uint8_t ff_adpcm_AdaptCoeff1[] = {
62  64, 128, 0, 48, 60, 115, 98
63 };
64 
66 const int8_t ff_adpcm_AdaptCoeff2[] = {
67  0, -64, 0, 16, 0, -52, -58
68 };
69 
70 const int16_t ff_adpcm_yamaha_indexscale[] = {
71  230, 230, 230, 230, 307, 409, 512, 614,
72  230, 230, 230, 230, 307, 409, 512, 614
73 };
74 
75 const int8_t ff_adpcm_yamaha_difflookup[] = {
76  1, 3, 5, 7, 9, 11, 13, 15,
77  -1, -3, -5, -7, -9, -11, -13, -15
78 };