yading@10: /*
yading@10:  * mpeg audio layer 2 tables. Most of them come from the mpeg audio
yading@10:  * specification.
yading@10:  *
yading@10:  * Copyright (c) 2000, 2001 Fabrice Bellard
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * mpeg audio layer 2 tables.
yading@10:  * Most of them come from the mpeg audio specification.
yading@10:  */
yading@10: 
yading@10: #ifndef AVCODEC_MPEGAUDIOTAB_H
yading@10: #define AVCODEC_MPEGAUDIOTAB_H
yading@10: 
yading@10: #include <stdint.h>
yading@10: #include "mpegaudio.h"
yading@10: 
yading@10: #define SQRT2 1.41421356237309514547
yading@10: 
yading@10: static const int costab32[30] = {
yading@10:     FIX(0.54119610014619701222),
yading@10:     FIX(1.3065629648763763537),
yading@10: 
yading@10:     FIX(0.50979557910415917998),
yading@10:     FIX(2.5629154477415054814),
yading@10:     FIX(0.89997622313641556513),
yading@10:     FIX(0.60134488693504528634),
yading@10: 
yading@10:     FIX(0.5024192861881556782),
yading@10:     FIX(5.1011486186891552563),
yading@10:     FIX(0.78815462345125020249),
yading@10:     FIX(0.64682178335999007679),
yading@10:     FIX(0.56694403481635768927),
yading@10:     FIX(1.0606776859903470633),
yading@10:     FIX(1.7224470982383341955),
yading@10:     FIX(0.52249861493968885462),
yading@10: 
yading@10:     FIX(10.19000812354803287),
yading@10:     FIX(0.674808341455005678),
yading@10:     FIX(1.1694399334328846596),
yading@10:     FIX(0.53104259108978413284),
yading@10:     FIX(2.0577810099534108446),
yading@10:     FIX(0.58293496820613388554),
yading@10:     FIX(0.83934964541552681272),
yading@10:     FIX(0.50547095989754364798),
yading@10:     FIX(3.4076084184687189804),
yading@10:     FIX(0.62250412303566482475),
yading@10:     FIX(0.97256823786196078263),
yading@10:     FIX(0.51544730992262455249),
yading@10:     FIX(1.4841646163141661852),
yading@10:     FIX(0.5531038960344445421),
yading@10:     FIX(0.74453627100229857749),
yading@10:     FIX(0.5006029982351962726),
yading@10: };
yading@10: 
yading@10: static const int bitinv32[32] = {
yading@10:     0,  16,  8, 24,  4,  20,  12,  28,
yading@10:     2,  18, 10, 26,  6,  22,  14,  30,
yading@10:     1,  17,  9, 25,  5,  21,  13,  29,
yading@10:     3,  19, 11, 27,  7,  23,  15,  31
yading@10: };
yading@10: 
yading@10: 
yading@10: static int16_t filter_bank[512];
yading@10: 
yading@10: static int scale_factor_table[64];
yading@10: #ifdef USE_FLOATS
yading@10: static float scale_factor_inv_table[64];
yading@10: #else
yading@10: static int8_t scale_factor_shift[64];
yading@10: static unsigned short scale_factor_mult[64];
yading@10: #endif
yading@10: static unsigned char scale_diff_table[128];
yading@10: 
yading@10: /* total number of bits per allocation group */
yading@10: static unsigned short total_quant_bits[17];
yading@10: 
yading@10: /* signal to noise ratio of each quantification step (could be
yading@10:    computed from quant_steps[]). The values are dB multiplied by 10
yading@10: */
yading@10: static const unsigned short quant_snr[17] = {
yading@10:      70, 110, 160, 208,
yading@10:     253, 316, 378, 439,
yading@10:     499, 559, 620, 680,
yading@10:     740, 800, 861, 920,
yading@10:     980
yading@10: };
yading@10: 
yading@10: /* fixed psycho acoustic model. Values of SNR taken from the 'toolame'
yading@10:    project */
yading@10: static const float fixed_smr[SBLIMIT] =  {
yading@10:     30, 17, 16, 10, 3, 12, 8, 2.5,
yading@10:     5, 5, 6, 6, 5, 6, 10, 6,
yading@10:     -4, -10, -21, -30, -42, -55, -68, -75,
yading@10:     -75, -75, -75, -75, -91, -107, -110, -108
yading@10: };
yading@10: 
yading@10: static const unsigned char nb_scale_factors[4] = { 3, 2, 1, 2 };
yading@10: 
yading@10: #endif /* AVCODEC_MPEGAUDIOTAB_H */