mirror of
https://github.com/DrBeef/JKXR.git
synced 2024-11-29 23:42:38 +00:00
4597b03873
Opens in Android Studio but haven't even tried to build it yet (it won't.. I know that much!)
416 lines
10 KiB
C
416 lines
10 KiB
C
/*____________________________________________________________________________
|
|
|
|
FreeAmp - The Free MP3 Player
|
|
|
|
MP3 Decoder originally Copyright (C) 1995-1997 Xing Technology
|
|
Corp. http://www.xingtech.com
|
|
|
|
Portions Copyright (C) 1998 EMusic.com
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
|
|
$Id: l3init.c,v 1.2 1999/10/19 07:13:09 elrod Exp $
|
|
____________________________________________________________________________*/
|
|
|
|
/**** tinit.c ***************************************************
|
|
Layer III init tables
|
|
|
|
|
|
******************************************************************/
|
|
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <float.h>
|
|
#include <math.h>
|
|
#include "l3.h"
|
|
|
|
/*---------- quant ---------------------------------*/
|
|
/* 8 bit lookup x = pow(2.0, 0.25*(global_gain-210)) */
|
|
float *quant_init_global_addr();
|
|
|
|
|
|
/* x = pow(2.0, -0.5*(1+scalefact_scale)*scalefac + preemp) */
|
|
typedef float LS[4][32];
|
|
LS *quant_init_scale_addr();
|
|
|
|
|
|
float *quant_init_pow_addr();
|
|
float *quant_init_subblock_addr();
|
|
|
|
typedef int iARRAY22[22];
|
|
iARRAY22 *quant_init_band_addr();
|
|
|
|
/*---------- antialias ---------------------------------*/
|
|
typedef float PAIR[2];
|
|
PAIR *alias_init_addr();
|
|
|
|
static const float Ci[8] =
|
|
{
|
|
-0.6f, -0.535f, -0.33f, -0.185f, -0.095f, -0.041f, -0.0142f, -0.0037f};
|
|
|
|
|
|
void hwin_init(); /* hybrid windows -- */
|
|
void imdct_init();
|
|
typedef struct
|
|
{
|
|
float *w;
|
|
float *w2;
|
|
void *coef;
|
|
}
|
|
IMDCT_INIT_BLOCK;
|
|
|
|
void msis_init();
|
|
void msis_init_MPEG2();
|
|
|
|
/*=============================================================*/
|
|
int L3table_init()
|
|
{
|
|
int i;
|
|
float *x;
|
|
LS *ls;
|
|
int scalefact_scale, preemp, scalefac;
|
|
double tmp;
|
|
PAIR *csa;
|
|
|
|
static int iOnceOnly = 0;
|
|
|
|
if (!iOnceOnly++)
|
|
{
|
|
/*================ 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();
|
|
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();
|
|
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();
|
|
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();
|
|
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 ===============================*/
|
|
// onceonly!!!!!!!!!!!!!!!!!!!!!
|
|
csa = alias_init_addr();
|
|
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]));
|
|
}
|
|
}
|
|
|
|
// these 4 are iOnceOnly-protected inside...
|
|
|
|
/*================ msis ===============================*/
|
|
msis_init();
|
|
msis_init_MPEG2();
|
|
|
|
/*================ imdct ===============================*/
|
|
imdct_init();
|
|
|
|
/*--- hybrid windows ------------*/
|
|
hwin_init();
|
|
|
|
return 0;
|
|
}
|
|
/*====================================================================*/
|
|
typedef float ARRAY36[36];
|
|
ARRAY36 *hwin_init_addr();
|
|
|
|
/*--------------------------------------------------------------------*/
|
|
void hwin_init()
|
|
{
|
|
int i, j;
|
|
double pi;
|
|
ARRAY36 *win;
|
|
|
|
static int iOnceOnly = 0;
|
|
|
|
if (!iOnceOnly++)
|
|
{
|
|
win = hwin_init_addr();
|
|
|
|
pi = 4.0 * atan(1.0);
|
|
|
|
/* type 0 */
|
|
for (i = 0; i < 36; i++)
|
|
win[0][i] = (float) sin(pi / 36 * (i + 0.5));
|
|
|
|
/* type 1 */
|
|
for (i = 0; i < 18; i++)
|
|
win[1][i] = (float) sin(pi / 36 * (i + 0.5));
|
|
for (i = 18; i < 24; i++)
|
|
win[1][i] = 1.0F;
|
|
for (i = 24; i < 30; i++)
|
|
win[1][i] = (float) sin(pi / 12 * (i + 0.5 - 18));
|
|
for (i = 30; i < 36; i++)
|
|
win[1][i] = 0.0F;
|
|
|
|
/* type 3 */
|
|
for (i = 0; i < 6; i++)
|
|
win[3][i] = 0.0F;
|
|
for (i = 6; i < 12; i++)
|
|
win[3][i] = (float) sin(pi / 12 * (i + 0.5 - 6));
|
|
for (i = 12; i < 18; i++)
|
|
win[3][i] = 1.0F;
|
|
for (i = 18; i < 36; i++)
|
|
win[3][i] = (float) sin(pi / 36 * (i + 0.5));
|
|
|
|
/* type 2 */
|
|
for (i = 0; i < 12; i++)
|
|
win[2][i] = (float) sin(pi / 12 * (i + 0.5));
|
|
for (i = 12; i < 36; i++)
|
|
win[2][i] = 0.0F;
|
|
|
|
/*--- invert signs by region to match mdct 18pt --> 36pt mapping */
|
|
for (j = 0; j < 4; j++)
|
|
{
|
|
if (j == 2)
|
|
continue;
|
|
for (i = 9; i < 36; i++)
|
|
win[j][i] = -win[j][i];
|
|
}
|
|
|
|
/*-- invert signs for short blocks --*/
|
|
for (i = 3; i < 12; i++)
|
|
win[2][i] = -win[2][i];
|
|
}
|
|
}
|
|
/*=============================================================*/
|
|
typedef float ARRAY4[4];
|
|
const IMDCT_INIT_BLOCK *imdct_init_addr_18();
|
|
const IMDCT_INIT_BLOCK *imdct_init_addr_6();
|
|
|
|
/*-------------------------------------------------------------*/
|
|
void imdct_init()
|
|
{
|
|
int k, p, n;
|
|
double t, pi;
|
|
const IMDCT_INIT_BLOCK *addr;
|
|
float *w, *w2;
|
|
float *v, *v2, *coef87;
|
|
ARRAY4 *coef;
|
|
|
|
static int iOnceOnly = 0;
|
|
|
|
if (!iOnceOnly++)
|
|
{
|
|
/*--- 18 point --*/
|
|
addr = imdct_init_addr_18();
|
|
w = addr->w;
|
|
w2 = addr->w2;
|
|
coef = addr->coef;
|
|
/*----*/
|
|
n = 18;
|
|
pi = 4.0 * atan(1.0);
|
|
t = pi / (4 * n);
|
|
for (p = 0; p < n; p++)
|
|
w[p] = (float) (2.0 * cos(t * (2 * p + 1)));
|
|
for (p = 0; p < 9; p++)
|
|
w2[p] = (float) (2.0 *cos(2 * t * (2 * p + 1)));
|
|
|
|
t = pi / (2 * n);
|
|
for (k = 0; k < 9; k++)
|
|
{
|
|
for (p = 0; p < 4; p++)
|
|
coef[k][p] = (float) cos(t * (2 * k) * (2 * p + 1));
|
|
}
|
|
|
|
/*--- 6 point */
|
|
addr = imdct_init_addr_6();
|
|
v = addr->w;
|
|
v2 = addr->w2;
|
|
coef87 = addr->coef;
|
|
/*----*/
|
|
n = 6;
|
|
pi = 4.0 * atan(1.0);
|
|
t = pi / (4 * n);
|
|
for (p = 0; p < n; p++)
|
|
v[p] = (float) (2.0 *cos(t * (2 * p + 1)));
|
|
|
|
for (p = 0; p < 3; p++)
|
|
v2[p] = (float) (2.0 *cos(2 * t * (2 * p + 1)));
|
|
|
|
t = pi / (2 * n);
|
|
k = 1;
|
|
p = 0;
|
|
*coef87 = (float) cos(t * (2 * k) * (2 * p + 1));
|
|
/* adjust scaling to save a few mults */
|
|
for (p = 0; p < 6; p++)
|
|
v[p] = v[p] / 2.0f;
|
|
*coef87 = (float) (2.0 *(*coef87));
|
|
|
|
}
|
|
}
|
|
/*===============================================================*/
|
|
typedef float ARRAY8_2[8][2];
|
|
ARRAY8_2 *msis_init_addr();
|
|
|
|
/*-------------------------------------------------------------*/
|
|
void msis_init()
|
|
{
|
|
int i;
|
|
double s, c;
|
|
double pi;
|
|
double t;
|
|
ARRAY8_2 *lr;
|
|
|
|
static int iOnceOnly = 0;
|
|
|
|
if (!iOnceOnly++)
|
|
{
|
|
lr = msis_init_addr();
|
|
|
|
|
|
pi = 4.0 * atan(1.0);
|
|
t = pi / 12.0;
|
|
for (i = 0; i < 7; i++)
|
|
{
|
|
s = sin(i * t);
|
|
c = cos(i * t);
|
|
/* ms_mode = 0 */
|
|
lr[0][i][0] = (float) (s / (s + c));
|
|
lr[0][i][1] = (float) (c / (s + c));
|
|
/* ms_mode = 1 */
|
|
lr[1][i][0] = (float) (sqrt(2.0) * (s / (s + c)));
|
|
lr[1][i][1] = (float) (sqrt(2.0) * (c / (s + c)));
|
|
}
|
|
/* sf = 7 */
|
|
/* ms_mode = 0 */
|
|
lr[0][i][0] = 1.0f;
|
|
lr[0][i][1] = 0.0f;
|
|
/* ms_mode = 1, in is bands is routine does ms processing */
|
|
lr[1][i][0] = 1.0f;
|
|
lr[1][i][1] = 1.0f;
|
|
|
|
|
|
/*-------
|
|
for(i=0;i<21;i++) nBand[0][i] =
|
|
sfBandTable[sr_index].l[i+1] - sfBandTable[sr_index].l[i];
|
|
for(i=0;i<12;i++) nBand[1][i] =
|
|
sfBandTable[sr_index].s[i+1] - sfBandTable[sr_index].s[i];
|
|
-------------*/
|
|
}
|
|
}
|
|
/*-------------------------------------------------------------*/
|
|
/*===============================================================*/
|
|
typedef float ARRAY2_64_2[2][64][2];
|
|
ARRAY2_64_2 *msis_init_addr_MPEG2();
|
|
|
|
/*-------------------------------------------------------------*/
|
|
void msis_init_MPEG2()
|
|
{
|
|
int k, n;
|
|
double t;
|
|
ARRAY2_64_2 *lr2;
|
|
int intensity_scale, ms_mode, sf, sflen;
|
|
float ms_factor[2];
|
|
|
|
static int iOnceOnly = 0;
|
|
|
|
if (!iOnceOnly++)
|
|
{
|
|
ms_factor[0] = 1.0;
|
|
ms_factor[1] = (float) sqrt(2.0);
|
|
|
|
lr2 = msis_init_addr_MPEG2();
|
|
|
|
/* intensity stereo MPEG2 */
|
|
/* lr2[intensity_scale][ms_mode][sflen_offset+sf][left/right] */
|
|
|
|
for (intensity_scale = 0; intensity_scale < 2; intensity_scale++)
|
|
{
|
|
t = pow(2.0, -0.25 * (1 + intensity_scale));
|
|
for (ms_mode = 0; ms_mode < 2; ms_mode++)
|
|
{
|
|
|
|
n = 1;
|
|
k = 0;
|
|
for (sflen = 0; sflen < 6; sflen++)
|
|
{
|
|
for (sf = 0; sf < (n - 1); sf++, k++)
|
|
{
|
|
if (sf == 0)
|
|
{
|
|
lr2[intensity_scale][ms_mode][k][0] = ms_factor[ms_mode] * 1.0f;
|
|
lr2[intensity_scale][ms_mode][k][1] = ms_factor[ms_mode] * 1.0f;
|
|
}
|
|
else if ((sf & 1))
|
|
{
|
|
lr2[intensity_scale][ms_mode][k][0] =
|
|
(float) (ms_factor[ms_mode] * pow(t, (sf + 1) / 2));
|
|
lr2[intensity_scale][ms_mode][k][1] = ms_factor[ms_mode] * 1.0f;
|
|
}
|
|
else
|
|
{
|
|
lr2[intensity_scale][ms_mode][k][0] = ms_factor[ms_mode] * 1.0f;
|
|
lr2[intensity_scale][ms_mode][k][1] =
|
|
(float) (ms_factor[ms_mode] * pow(t, sf / 2));
|
|
}
|
|
}
|
|
|
|
/* illegal is_pos used to do ms processing */
|
|
if (ms_mode == 0)
|
|
{ /* ms_mode = 0 */
|
|
lr2[intensity_scale][ms_mode][k][0] = 1.0f;
|
|
lr2[intensity_scale][ms_mode][k][1] = 0.0f;
|
|
}
|
|
else
|
|
{
|
|
/* ms_mode = 1, in is bands is routine does ms processing */
|
|
lr2[intensity_scale][ms_mode][k][0] = 1.0f;
|
|
lr2[intensity_scale][ms_mode][k][1] = 1.0f;
|
|
}
|
|
k++;
|
|
n = n + n;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
/*-------------------------------------------------------------*/
|