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1 | /* |
2 | * AC-3 and E-AC-3 decoder tables | |
3 | * Copyright (c) 2007 Bartlomiej Wolowiec <bartek.wolowiec@gmail.com> | |
4 | * | |
5 | * This file is part of FFmpeg. | |
6 | * | |
7 | * FFmpeg is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU Lesser General Public | |
9 | * License as published by the Free Software Foundation; either | |
10 | * version 2.1 of the License, or (at your option) any later version. | |
11 | * | |
12 | * FFmpeg is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * Lesser General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU Lesser General Public | |
18 | * License along with FFmpeg; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
20 | */ | |
21 | ||
22 | /** | |
23 | * @file | |
24 | * Tables taken directly from the AC-3 spec. | |
25 | */ | |
26 | ||
27 | #include "ac3dec_data.h" | |
28 | #include "ac3.h" | |
29 | ||
30 | /** | |
31 | * Table used to ungroup 3 values stored in 5 bits. | |
32 | * Used by bap=1 mantissas and GAQ. | |
33 | * ff_ac3_ungroup_3_in_5_bits_tab[i] = { i/9, (i%9)/3, (i%9)%3 } | |
34 | */ | |
35 | const uint8_t ff_ac3_ungroup_3_in_5_bits_tab[32][3] = { | |
36 | { 0, 0, 0 }, { 0, 0, 1 }, { 0, 0, 2 }, { 0, 1, 0 }, | |
37 | { 0, 1, 1 }, { 0, 1, 2 }, { 0, 2, 0 }, { 0, 2, 1 }, | |
38 | { 0, 2, 2 }, { 1, 0, 0 }, { 1, 0, 1 }, { 1, 0, 2 }, | |
39 | { 1, 1, 0 }, { 1, 1, 1 }, { 1, 1, 2 }, { 1, 2, 0 }, | |
40 | { 1, 2, 1 }, { 1, 2, 2 }, { 2, 0, 0 }, { 2, 0, 1 }, | |
41 | { 2, 0, 2 }, { 2, 1, 0 }, { 2, 1, 1 }, { 2, 1, 2 }, | |
42 | { 2, 2, 0 }, { 2, 2, 1 }, { 2, 2, 2 }, { 3, 0, 0 }, | |
43 | { 3, 0, 1 }, { 3, 0, 2 }, { 3, 1, 0 }, { 3, 1, 1 } | |
44 | }; | |
45 | ||
46 | const uint8_t ff_eac3_hebap_tab[64] = { | |
47 | 0, 1, 2, 3, 4, 5, 6, 7, 8, 8, | |
48 | 8, 8, 9, 9, 9, 10, 10, 10, 10, 11, | |
49 | 11, 11, 11, 12, 12, 12, 12, 13, 13, 13, | |
50 | 13, 14, 14, 14, 14, 15, 15, 15, 15, 16, | |
51 | 16, 16, 16, 17, 17, 17, 17, 18, 18, 18, | |
52 | 18, 18, 18, 18, 18, 19, 19, 19, 19, 19, | |
53 | 19, 19, 19, 19, | |
54 | }; | |
55 | ||
56 | /** | |
57 | * Table E2.15 Default Spectral Extension Banding Structure | |
58 | */ | |
59 | const uint8_t ff_eac3_default_spx_band_struct[17] = | |
60 | { 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1 }; |