mirror of
https://gitee.com/openharmony/third_party_ffmpeg
synced 2024-11-24 03:39:45 +00:00
93 lines
2.4 KiB
C
93 lines
2.4 KiB
C
/*
|
|
* mpeg audio layer 2 tables. Most of them come from the mpeg audio
|
|
* specification.
|
|
*
|
|
* Copyright (c) 2000, 2001 Gerard Lantau.
|
|
*
|
|
* The licence of this code is contained in file LICENCE found in the
|
|
* same archive
|
|
*/
|
|
|
|
#define SQRT2 1.41421356237309514547
|
|
|
|
static 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 filter_bank[512];
|
|
|
|
static int scale_factor_table[64];
|
|
#ifdef USE_FLOATS
|
|
static float scale_factor_inv_table[64];
|
|
#else
|
|
static INT8 scale_factor_shift[64];
|
|
static unsigned short scale_factor_mult[64];
|
|
#endif
|
|
static 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 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 };
|
|
|