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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 | static const int8_t adpcm_index_table2[4] = { | |
31 | -1, 2, | |
32 | -1, 2, | |
33 | }; | |
34 | ||
35 | static const int8_t adpcm_index_table3[8] = { | |
36 | -1, -1, 1, 2, | |
37 | -1, -1, 1, 2, | |
38 | }; | |
39 | ||
40 | const 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 | ||
45 | static 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 | ||
50 | const 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 | */ | |
61 | const 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 | ||
73 | const 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 */ | |
84 | const 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 */ | |
90 | const 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 */ | |
95 | const int8_t ff_adpcm_AdaptCoeff2[] = { | |
96 | 0, -64, 0, 16, 0, -52, -58 | |
97 | }; | |
98 | ||
99 | const 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 | ||
104 | const 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 | ||
109 | const 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 | }; |