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
38static 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
74static 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
82static int16_t filter_bank[512];
83
84static int scale_factor_table[64];
85#ifdef USE_FLOATS
86static float scale_factor_inv_table[64];
87#else
88static int8_t scale_factor_shift[64];
89static unsigned short scale_factor_mult[64];
90#endif
91static unsigned char scale_diff_table[128];
92
93/* total number of bits per allocation group */
94static unsigned short total_quant_bits[17];
95
96/* signal to noise ratio of each quantification step (could be
97   computed from quant_steps[]). The values are dB multiplied by 10
98*/
99static const unsigned short quant_snr[17] = {
100     70, 110, 160, 208,
101    253, 316, 378, 439,
102    499, 559, 620, 680,
103    740, 800, 861, 920,
104    980
105};
106
107/* fixed psycho acoustic model. Values of SNR taken from the 'toolame'
108   project */
109static const float fixed_smr[SBLIMIT] =  {
110    30, 17, 16, 10, 3, 12, 8, 2.5,
111    5, 5, 6, 6, 5, 6, 10, 6,
112    -4, -10, -21, -30, -42, -55, -68, -75,
113    -75, -75, -75, -75, -91, -107, -110, -108
114};
115
116static const unsigned char nb_scale_factors[4] = { 3, 2, 1, 2 };
117
118#endif /* AVCODEC_MPEGAUDIOTAB_H */
119