/* * mpeg audio layer 2 tables. Most of them come from the mpeg audio * specification. *  * Copyright (c) 2000, 2001 Fabrice Bellard. * * The licence of this code is contained in file LICENCE found in the * same archive  *//** * @file mpegaudiotab.h * mpeg audio layer 2 tables.  * Most of them come from the mpeg audio specification. */ #define SQRT2 1.41421356237309514547static const int costab32[30] = {    FIX(0.54119610014619701222),    FIX(1.3065629648763763537),        FIX(0.50979557910415917998),    FIX(2.5629154477415054814),    FIX(0.89997622313641556513),    FIX(0.60134488693504528634),        FIX(0.5024192861881556782),    FIX(5.1011486186891552563),    FIX(0.78815462345125020249),    FIX(0.64682178335999007679),    FIX(0.56694403481635768927),    FIX(1.0606776859903470633),    FIX(1.7224470982383341955),    FIX(0.52249861493968885462),        FIX(10.19000812354803287),    FIX(0.674808341455005678),    FIX(1.1694399334328846596),    FIX(0.53104259108978413284),    FIX(2.0577810099534108446),    FIX(0.58293496820613388554),    FIX(0.83934964541552681272),    FIX(0.50547095989754364798),    FIX(3.4076084184687189804),    FIX(0.62250412303566482475),    FIX(0.97256823786196078263),    FIX(0.51544730992262455249),    FIX(1.4841646163141661852),    FIX(0.5531038960344445421),    FIX(0.74453627100229857749),    FIX(0.5006029982351962726),};static const int bitinv32[32] = {    0,  16,  8, 24,  4,  20,  12,  28,    2,  18, 10, 26,  6,  22,  14,  30,    1,  17,  9, 25,  5,  21,  13,  29,    3,  19, 11, 27,  7,  23,  15,  31};static int16_t filter_bank[512];static int scale_factor_table[64];#ifdef USE_FLOATSstatic float scale_factor_inv_table[64];#elsestatic int8_t scale_factor_shift[64];static unsigned short scale_factor_mult[64];#endifstatic unsigned char scale_diff_table[128];/* total number of bits per allocation group */static unsigned short total_quant_bits[17];/* signal to noise ratio of each quantification step (could be   computed from quant_steps[]). The values are dB multiplied by 10 */static const unsigned short quant_snr[17] = {      70, 110, 160, 208,    253, 316, 378, 439,    499, 559, 620, 680,     740, 800, 861, 920,     980};/* fixed psycho acoustic model. Values of SNR taken from the 'toolame'   project */static const float fixed_smr[SBLIMIT] =  {    30, 17, 16, 10, 3, 12, 8, 2.5,    5, 5, 6, 6, 5, 6, 10, 6,    -4, -10, -21, -30, -42, -55, -68, -75,    -75, -75, -75, -75, -91, -107, -110, -108};static const unsigned char nb_scale_factors[4] = { 3, 2, 1, 2 };