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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. static int16_t filter_bank[512];
  83.  
  84. static int scale_factor_table[64];
  85. #ifdef USE_FLOATS
  86. static float scale_factor_inv_table[64];
  87. #else
  88. static int8_t scale_factor_shift[64];
  89. static unsigned short scale_factor_mult[64];
  90. #endif
  91. static unsigned char scale_diff_table[128];
  92.  
  93. /* total number of bits per allocation group */
  94. static 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. */
  99. static 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 */
  109. static 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.  
  116. static const unsigned char nb_scale_factors[4] = { 3, 2, 1, 2 };
  117.  
  118. #endif /* AVCODEC_MPEGAUDIOTAB_H */
  119.