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1 | /* |
2 | * mpeg audio layer 2 tables. Most of them come from the mpeg audio | |
3 | * specification. | |
4 | * | |
5 | * Copyright (c) 2000, 2001 Fabrice Bellard | |
6 | * | |
7 | * This file is part of FFmpeg. | |
8 | * | |
9 | * FFmpeg is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU Lesser General Public | |
11 | * License as published by the Free Software Foundation; either | |
12 | * version 2.1 of the License, or (at your option) any later version. | |
13 | * | |
14 | * FFmpeg is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * Lesser General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU Lesser General Public | |
20 | * License along with FFmpeg; if not, write to the Free Software | |
21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
22 | */ | |
23 | ||
24 | /** | |
25 | * @file | |
26 | * mpeg audio layer 2 tables. | |
27 | * Most of them come from the mpeg audio specification. | |
28 | */ | |
29 | ||
30 | #ifndef AVCODEC_MPEGAUDIOTAB_H | |
31 | #define AVCODEC_MPEGAUDIOTAB_H | |
32 | ||
33 | #include <stdint.h> | |
34 | #include "mpegaudio.h" | |
35 | ||
36 | #define SQRT2 1.41421356237309514547 | |
37 | ||
38 | static const int costab32[30] = { | |
39 | FIX(0.54119610014619701222), | |
40 | FIX(1.3065629648763763537), | |
41 | ||
42 | FIX(0.50979557910415917998), | |
43 | FIX(2.5629154477415054814), | |
44 | FIX(0.89997622313641556513), | |
45 | FIX(0.60134488693504528634), | |
46 | ||
47 | FIX(0.5024192861881556782), | |
48 | FIX(5.1011486186891552563), | |
49 | FIX(0.78815462345125020249), | |
50 | FIX(0.64682178335999007679), | |
51 | FIX(0.56694403481635768927), | |
52 | FIX(1.0606776859903470633), | |
53 | FIX(1.7224470982383341955), | |
54 | FIX(0.52249861493968885462), | |
55 | ||
56 | FIX(10.19000812354803287), | |
57 | FIX(0.674808341455005678), | |
58 | FIX(1.1694399334328846596), | |
59 | FIX(0.53104259108978413284), | |
60 | FIX(2.0577810099534108446), | |
61 | FIX(0.58293496820613388554), | |
62 | FIX(0.83934964541552681272), | |
63 | FIX(0.50547095989754364798), | |
64 | FIX(3.4076084184687189804), | |
65 | FIX(0.62250412303566482475), | |
66 | FIX(0.97256823786196078263), | |
67 | FIX(0.51544730992262455249), | |
68 | FIX(1.4841646163141661852), | |
69 | FIX(0.5531038960344445421), | |
70 | FIX(0.74453627100229857749), | |
71 | FIX(0.5006029982351962726), | |
72 | }; | |
73 | ||
74 | static const int bitinv32[32] = { | |
75 | 0, 16, 8, 24, 4, 20, 12, 28, | |
76 | 2, 18, 10, 26, 6, 22, 14, 30, | |
77 | 1, 17, 9, 25, 5, 21, 13, 29, | |
78 | 3, 19, 11, 27, 7, 23, 15, 31 | |
79 | }; | |
80 | ||
81 | ||
82 | /* signal to noise ratio of each quantification step (could be | |
83 | computed from quant_steps[]). The values are dB multiplied by 10 | |
84 | */ | |
85 | static const unsigned short quant_snr[17] = { | |
86 | 70, 110, 160, 208, | |
87 | 253, 316, 378, 439, | |
88 | 499, 559, 620, 680, | |
89 | 740, 800, 861, 920, | |
90 | 980 | |
91 | }; | |
92 | ||
93 | /* fixed psycho acoustic model. Values of SNR taken from the 'toolame' | |
94 | project */ | |
95 | static const float fixed_smr[SBLIMIT] = { | |
96 | 30, 17, 16, 10, 3, 12, 8, 2.5, | |
97 | 5, 5, 6, 6, 5, 6, 10, 6, | |
98 | -4, -10, -21, -30, -42, -55, -68, -75, | |
99 | -75, -75, -75, -75, -91, -107, -110, -108 | |
100 | }; | |
101 | ||
102 | static const unsigned char nb_scale_factors[4] = { 3, 2, 1, 2 }; | |
103 | ||
104 | #endif /* AVCODEC_MPEGAUDIOTAB_H */ |