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281 lines (239 loc) · 7.43 KB
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/*____________________________________________________________________________
FreeAmp - The Free MP3 Player
MP3 Decoder originally Copyright (C) 1995-1997 Xing Technology
Corp. http://www.xingtech.com
Portions Copyright (C) 1998-1999 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.
____________________________________________________________________________*/
/**** hwin.c ***************************************************
Layer III
hybrid window/filter
******************************************************************/
#include <float.h>
#include <math.h>
#include "L3.h"
#include "mhead.h"
#ifdef ASM_X86
extern int hybrid_asm(float xin[], float xprev[], float y[18][32],
int btype, int nlong, int ntot, int nprev, float *win, int band_limit_nsb);
extern void FreqInvert_asm(float y[18][32], int n);
#endif /* ASM_X86 */
typedef float ARRAY36[36];
/*====================================================================*/
void imdct18(float f[]); /* 18 point */
void imdct6_3(float f[]); /* 6 point */
/*====================================================================*/
ARRAY36 *hwin_init_addr(MPEG *m)
{
return m->cupl.win;
}
#ifdef ASM_X86
#ifdef _MSC_VER
#pragma warning(disable: 4035)
#endif /* _MSC_VER */
#endif /* ASM_X86 */
/*====================================================================*/
int hybrid(MPEG *m, float xin[], float xprev[], float y[18][32],
int btype, int nlong, int ntot, int nprev)
{
#ifdef ASM_X86
return hybrid_asm(xin, xprev, y, btype, nlong, ntot, nprev, (float *)m->cupl.win, m->cupl.band_limit_nsb);
#else
int i, j;
float *x, *x0;
float xa, xb;
int n;
int nout;
if (btype == 2)
btype = 0;
x = xin;
x0 = xprev;
/*-- do long blocks (if any) --*/
n = (nlong + 17) / 18; /* number of dct's to do */
for (i = 0; i < n; i++)
{
imdct18(x);
for (j = 0; j < 9; j++)
{
y[j][i] = x0[j] + m->cupl.win[btype][j] * x[9 + j];
y[9 + j][i] = x0[9 + j] + m->cupl.win[btype][9 + j] * x[17 - j];
}
/* window x for next time x0 */
for (j = 0; j < 4; j++)
{
xa = x[j];
xb = x[8 - j];
x[j] = m->cupl.win[btype][18 + j] * xb;
x[8 - j] = m->cupl.win[btype][(18 + 8) - j] * xa;
x[9 + j] = m->cupl.win[btype][(18 + 9) + j] * xa;
x[17 - j] = m->cupl.win[btype][(18 + 17) - j] * xb;
}
xa = x[j];
x[j] = m->cupl.win[btype][18 + j] * xa;
x[9 + j] = m->cupl.win[btype][(18 + 9) + j] * xa;
x += 18;
x0 += 18;
}
/*-- do short blocks (if any) --*/
n = (ntot + 17) / 18; /* number of 6 pt dct's triples to do */
for (; i < n; i++)
{
imdct6_3(x);
for (j = 0; j < 3; j++)
{
y[j][i] = x0[j];
y[3 + j][i] = x0[3 + j];
y[6 + j][i] = x0[6 + j] + m->cupl.win[2][j] * x[3 + j];
y[9 + j][i] = x0[9 + j] + m->cupl.win[2][3 + j] * x[5 - j];
y[12 + j][i] = x0[12 + j] + m->cupl.win[2][6 + j] * x[2 - j] + m->cupl.win[2][j] * x[(6 + 3) + j];
y[15 + j][i] = x0[15 + j] + m->cupl.win[2][9 + j] * x[j] + m->cupl.win[2][3 + j] * x[(6 + 5) - j];
}
/* window x for next time x0 */
for (j = 0; j < 3; j++)
{
x[j] = m->cupl.win[2][6 + j] * x[(6 + 2) - j] + m->cupl.win[2][j] * x[(12 + 3) + j];
x[3 + j] = m->cupl.win[2][9 + j] * x[6 + j] + m->cupl.win[2][3 + j] * x[(12 + 5) - j];
}
for (j = 0; j < 3; j++)
{
x[6 + j] = m->cupl.win[2][6 + j] * x[(12 + 2) - j];
x[9 + j] = m->cupl.win[2][9 + j] * x[12 + j];
}
for (j = 0; j < 3; j++)
{
x[12 + j] = 0.0f;
x[15 + j] = 0.0f;
}
x += 18;
x0 += 18;
}
/*--- overlap prev if prev longer that current --*/
n = (nprev + 17) / 18;
for (; i < n; i++)
{
for (j = 0; j < 18; j++)
y[j][i] = x0[j];
x0 += 18;
}
nout = 18 * i;
/*--- clear remaining only to band limit --*/
for (; i < m->cupl.band_limit_nsb; i++)
{
for (j = 0; j < 18; j++)
y[j][i] = 0.0f;
}
return nout;
#endif
}
#ifdef ASM_X86
#ifdef _MSC_VER
#pragma warning(default: 4035)
#endif /* _MSC_VER */
#endif /* ASM_X86 */
/*--------------------------------------------------------------------*/
/*--------------------------------------------------------------------*/
/*-- convert to mono, add curr result to y,
window and add next time to current left */
int hybrid_sum(MPEG *m, float xin[], float xin_left[], float y[18][32],
int btype, int nlong, int ntot)
{
int i, j;
float *x, *x0;
float xa, xb;
int n;
int nout;
if (btype == 2)
btype = 0;
x = xin;
x0 = xin_left;
/*-- do long blocks (if any) --*/
n = (nlong + 17) / 18; /* number of dct's to do */
for (i = 0; i < n; i++)
{
imdct18(x);
for (j = 0; j < 9; j++)
{
y[j][i] += m->cupl.win[btype][j] * x[9 + j];
y[9 + j][i] += m->cupl.win[btype][9 + j] * x[17 - j];
}
/* window x for next time x0 */
for (j = 0; j < 4; j++)
{
xa = x[j];
xb = x[8 - j];
x0[j] += m->cupl.win[btype][18 + j] * xb;
x0[8 - j] += m->cupl.win[btype][(18 + 8) - j] * xa;
x0[9 + j] += m->cupl.win[btype][(18 + 9) + j] * xa;
x0[17 - j] += m->cupl.win[btype][(18 + 17) - j] * xb;
}
xa = x[j];
x0[j] += m->cupl.win[btype][18 + j] * xa;
x0[9 + j] += m->cupl.win[btype][(18 + 9) + j] * xa;
x += 18;
x0 += 18;
}
/*-- do short blocks (if any) --*/
n = (ntot + 17) / 18; /* number of 6 pt dct's triples to do */
for (; i < n; i++)
{
imdct6_3(x);
for (j = 0; j < 3; j++)
{
y[6 + j][i] += m->cupl.win[2][j] * x[3 + j];
y[9 + j][i] += m->cupl.win[2][3 + j] * x[5 - j];
y[12 + j][i] += m->cupl.win[2][6 + j] * x[2 - j] + m->cupl.win[2][j] * x[(6 + 3) + j];
y[15 + j][i] += m->cupl.win[2][9 + j] * x[j] + m->cupl.win[2][3 + j] * x[(6 + 5) - j];
}
/* window x for next time */
for (j = 0; j < 3; j++)
{
x0[j] += m->cupl.win[2][6 + j] * x[(6 + 2) - j] + m->cupl.win[2][j] * x[(12 + 3) + j];
x0[3 + j] += m->cupl.win[2][9 + j] * x[6 + j] + m->cupl.win[2][3 + j] * x[(12 + 5) - j];
}
for (j = 0; j < 3; j++)
{
x0[6 + j] += m->cupl.win[2][6 + j] * x[(12 + 2) - j];
x0[9 + j] += m->cupl.win[2][9 + j] * x[12 + j];
}
x += 18;
x0 += 18;
}
nout = 18 * i;
return nout;
}
/*--------------------------------------------------------------------*/
void sum_f_bands(float a[], float b[], int n)
{
int i;
for (i = 0; i < n; i++)
a[i] += b[i];
}
/*--------------------------------------------------------------------*/
/*--------------------------------------------------------------------*/
void FreqInvert(float y[18][32], int n)
{
#ifdef ASM_X86
FreqInvert_asm(y, n);
#else
int i, j;
n = (n + 17) / 18;
for (j = 0; j < 18; j += 2)
{
for (i = 0; i < n; i += 2)
{
y[1 + j][1 + i] = -y[1 + j][1 + i];
}
}
#endif
}
/*--------------------------------------------------------------------*/