/*=============================================================*/
void
L3table_init ( int sr_index_arg, int h_id_arg, int band_limit_arg )
{
int i;
ARRAY8 *csa;
/* save for band table generator */
sr_index = sr_index_arg;
h_id = h_id_arg;
band_limit = band_limit_arg;
/*================ antialias ===============================*/
csa = xingenc_alias_init_addr ( );
for ( i = 0; i < 8; i++ )
{
csa[0][i] = ( float ) ( 1.0 / sqrt ( 1.0 + Ci[i] * Ci[i] ) );
csa[1][i] = ( float ) ( Ci[i] / sqrt ( 1.0 + Ci[i] * Ci[i] ) );
}
/*================ mdct ===============================*/
mdct_init ( );
/*--- hybrid windows ------------*/
hwin_init ( );
}
/*=============================================================*/
int L3table_init(MPEG *m)
{
int i;
float *x;
LS *ls;
int scalefact_scale, preemp, scalefac;
double tmp;
PAIR *csa;
/*================ quant ===============================*/
/* 8 bit plus 2 lookup x = pow(2.0, 0.25*(global_gain-210)) */
/* extra 2 for ms scaling by 1/sqrt(2) */
/* extra 4 for cvt to mono scaling by 1/2 */
x = quant_init_global_addr(m);
for (i = 0; i < 256 + 2 + 4; i++)
x[i] = (float) pow(2.0, 0.25 * ((i - (2 + 4)) - 210 + GLOBAL_GAIN_SCALE));
/* x = pow(2.0, -0.5*(1+scalefact_scale)*scalefac + preemp) */
ls = quant_init_scale_addr(m);
for (scalefact_scale = 0; scalefact_scale < 2; scalefact_scale++)
{
for (preemp = 0; preemp < 4; preemp++)
{
for (scalefac = 0; scalefac < 32; scalefac++)
{
ls[scalefact_scale][preemp][scalefac] =
(float) pow(2.0, -0.5 * (1 + scalefact_scale) * (scalefac + preemp));
}
}
}
/*--- iSample**(4/3) lookup, -32<=i<=31 ---*/
x = quant_init_pow_addr(m);
for (i = 0; i < 64; i++)
{
tmp = i - 32;
x[i] = (float) (tmp * pow(fabs(tmp), (1.0 / 3.0)));
}
/*-- pow(2.0, -0.25*8.0*subblock_gain) 3 bits --*/
x = quant_init_subblock_addr(m);
for (i = 0; i < 8; i++)
{
x[i] = (float) pow(2.0, 0.25 * -8.0 * i);
}
/*-------------------------*/
// quant_init_sf_band(sr_index); replaced by code in sup.c
/*================ antialias ===============================*/
csa = alias_init_addr(m);
for (i = 0; i < 8; i++)
{
csa[i][0] = (float) (1.0 / sqrt(1.0 + Ci[i] * Ci[i]));
csa[i][1] = (float) (Ci[i] / sqrt(1.0 + Ci[i] * Ci[i]));
}
/*================ msis ===============================*/
msis_init(m);
msis_init_MPEG2(m);
/*================ imdct ===============================*/
imdct_init(m);
/*--- hybrid windows ------------*/
hwin_init(m);
return 0;
}
