2013-04-19 02:52:48 +00:00
|
|
|
#pragma warning(disable:4206) // nonstandard extension used : translation unit is empty
|
|
|
|
|
#ifdef COMPILE_ME
|
|
|
|
|
/*____________________________________________________________________________
|
|
|
|
|
|
|
|
|
|
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.
|
|
|
|
|
|
|
|
|
|
$Id: cwin.c,v 1.7 1999/10/19 07:13:08 elrod Exp $
|
|
|
|
|
____________________________________________________________________________*/
|
|
|
|
|
|
|
|
|
|
/**** cwin.c ***************************************************
|
|
|
|
|
|
|
|
|
|
include to cwinm.c
|
|
|
|
|
|
|
|
|
|
MPEG audio decoder, float window routines
|
|
|
|
|
portable C
|
|
|
|
|
|
|
|
|
|
******************************************************************/
|
|
|
|
|
|
|
|
|
|
#include "config.h"
|
|
|
|
|
|
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
|
void window(float *vbuf, int vb_ptr, short *pcm)
|
|
|
|
|
{
|
|
|
|
|
int i, j;
|
|
|
|
|
int si, bx;
|
|
|
|
|
const float *coef;
|
|
|
|
|
float sum;
|
|
|
|
|
long tmp;
|
|
|
|
|
|
|
|
|
|
si = vb_ptr + 16;
|
|
|
|
|
bx = (si + 32) & 511;
|
|
|
|
|
coef = wincoef;
|
|
|
|
|
|
|
|
|
|
/*-- first 16 --*/
|
|
|
|
|
for (i = 0; i < 16; i++)
|
|
|
|
|
{
|
|
|
|
|
sum = 0.0F;
|
|
|
|
|
for (j = 0; j < 8; j++)
|
|
|
|
|
{
|
|
|
|
|
sum += (*coef++) * vbuf[si];
|
|
|
|
|
si = (si + 64) & 511;
|
|
|
|
|
sum -= (*coef++) * vbuf[bx];
|
|
|
|
|
bx = (bx + 64) & 511;
|
|
|
|
|
}
|
|
|
|
|
si++;
|
|
|
|
|
bx--;
|
|
|
|
|
tmp = (long) sum;
|
|
|
|
|
if (tmp > 32767)
|
|
|
|
|
tmp = 32767;
|
|
|
|
|
else if (tmp < -32768)
|
|
|
|
|
tmp = -32768;
|
|
|
|
|
*pcm++ = tmp;
|
|
|
|
|
}
|
|
|
|
|
/*-- special case --*/
|
|
|
|
|
sum = 0.0F;
|
|
|
|
|
for (j = 0; j < 8; j++)
|
|
|
|
|
{
|
|
|
|
|
sum += (*coef++) * vbuf[bx];
|
|
|
|
|
bx = (bx + 64) & 511;
|
|
|
|
|
}
|
|
|
|
|
tmp = (long) sum;
|
|
|
|
|
if (tmp > 32767)
|
|
|
|
|
tmp = 32767;
|
|
|
|
|
else if (tmp < -32768)
|
|
|
|
|
tmp = -32768;
|
|
|
|
|
*pcm++ = tmp;
|
|
|
|
|
/*-- last 15 --*/
|
|
|
|
|
coef = wincoef + 255; /* back pass through coefs */
|
|
|
|
|
for (i = 0; i < 15; i++)
|
|
|
|
|
{
|
|
|
|
|
si--;
|
|
|
|
|
bx++;
|
|
|
|
|
sum = 0.0F;
|
|
|
|
|
for (j = 0; j < 8; j++)
|
|
|
|
|
{
|
|
|
|
|
sum += (*coef--) * vbuf[si];
|
|
|
|
|
si = (si + 64) & 511;
|
|
|
|
|
sum += (*coef--) * vbuf[bx];
|
|
|
|
|
bx = (bx + 64) & 511;
|
|
|
|
|
}
|
|
|
|
|
tmp = (long) sum;
|
|
|
|
|
if (tmp > 32767)
|
|
|
|
|
tmp = 32767;
|
|
|
|
|
else if (tmp < -32768)
|
|
|
|
|
tmp = -32768;
|
|
|
|
|
*pcm++ = tmp;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/*------------------------------------------------------------*/
|
|
|
|
|
void window_dual(float *vbuf, int vb_ptr, short *pcm)
|
|
|
|
|
{
|
|
|
|
|
int i, j; /* dual window interleaves output */
|
|
|
|
|
int si, bx;
|
|
|
|
|
const float *coef;
|
|
|
|
|
float sum;
|
|
|
|
|
long tmp;
|
|
|
|
|
|
|
|
|
|
si = vb_ptr + 16;
|
|
|
|
|
bx = (si + 32) & 511;
|
|
|
|
|
coef = wincoef;
|
|
|
|
|
|
|
|
|
|
/*-- first 16 --*/
|
|
|
|
|
for (i = 0; i < 16; i++)
|
|
|
|
|
{
|
|
|
|
|
sum = 0.0F;
|
|
|
|
|
for (j = 0; j < 8; j++)
|
|
|
|
|
{
|
|
|
|
|
sum += (*coef++) * vbuf[si];
|
|
|
|
|
si = (si + 64) & 511;
|
|
|
|
|
sum -= (*coef++) * vbuf[bx];
|
|
|
|
|
bx = (bx + 64) & 511;
|
|
|
|
|
}
|
|
|
|
|
si++;
|
|
|
|
|
bx--;
|
|
|
|
|
tmp = (long) sum;
|
|
|
|
|
if (tmp > 32767)
|
|
|
|
|
tmp = 32767;
|
|
|
|
|
else if (tmp < -32768)
|
|
|
|
|
tmp = -32768;
|
|
|
|
|
*pcm = tmp;
|
|
|
|
|
pcm += 2;
|
|
|
|
|
}
|
|
|
|
|
/*-- special case --*/
|
|
|
|
|
sum = 0.0F;
|
|
|
|
|
for (j = 0; j < 8; j++)
|
|
|
|
|
{
|
|
|
|
|
sum += (*coef++) * vbuf[bx];
|
|
|
|
|
bx = (bx + 64) & 511;
|
|
|
|
|
}
|
|
|
|
|
tmp = (long) sum;
|
|
|
|
|
if (tmp > 32767)
|
|
|
|
|
tmp = 32767;
|
|
|
|
|
else if (tmp < -32768)
|
|
|
|
|
tmp = -32768;
|
|
|
|
|
*pcm = tmp;
|
|
|
|
|
pcm += 2;
|
|
|
|
|
/*-- last 15 --*/
|
|
|
|
|
coef = wincoef + 255; /* back pass through coefs */
|
|
|
|
|
for (i = 0; i < 15; i++)
|
|
|
|
|
{
|
|
|
|
|
si--;
|
|
|
|
|
bx++;
|
|
|
|
|
sum = 0.0F;
|
|
|
|
|
for (j = 0; j < 8; j++)
|
|
|
|
|
{
|
|
|
|
|
sum += (*coef--) * vbuf[si];
|
|
|
|
|
si = (si + 64) & 511;
|
|
|
|
|
sum += (*coef--) * vbuf[bx];
|
|
|
|
|
bx = (bx + 64) & 511;
|
|
|
|
|
}
|
|
|
|
|
tmp = (long) sum;
|
|
|
|
|
if (tmp > 32767)
|
|
|
|
|
tmp = 32767;
|
|
|
|
|
else if (tmp < -32768)
|
|
|
|
|
tmp = -32768;
|
|
|
|
|
*pcm = tmp;
|
|
|
|
|
pcm += 2;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
/*------------------------------------------------------------*/
|
|
|
|
|
/*------------------- 16 pt window ------------------------------*/
|
|
|
|
|
void window16(float *vbuf, int vb_ptr, short *pcm)
|
|
|
|
|
{
|
|
|
|
|
int i, j;
|
|
|
|
|
unsigned char si, bx;
|
|
|
|
|
const float *coef;
|
|
|
|
|
float sum;
|
|
|
|
|
long tmp;
|
|
|
|
|
|
|
|
|
|
si = vb_ptr + 8;
|
|
|
|
|
bx = si + 16;
|
|
|
|
|
coef = wincoef;
|
|
|
|
|
|
|
|
|
|
/*-- first 8 --*/
|
|
|
|
|
for (i = 0; i < 8; i++)
|
|
|
|
|
{
|
|
|
|
|
sum = 0.0F;
|
|
|
|
|
for (j = 0; j < 8; j++)
|
|
|
|
|
{
|
|
|
|
|
sum += (*coef++) * vbuf[si];
|
|
|
|
|
si += 32;
|
|
|
|
|
sum -= (*coef++) * vbuf[bx];
|
|
|
|
|
bx += 32;
|
|
|
|
|
}
|
|
|
|
|
si++;
|
|
|
|
|
bx--;
|
|
|
|
|
coef += 16;
|
|
|
|
|
tmp = (long) sum;
|
|
|
|
|
if (tmp > 32767)
|
|
|
|
|
tmp = 32767;
|
|
|
|
|
else if (tmp < -32768)
|
|
|
|
|
tmp = -32768;
|
|
|
|
|
*pcm++ = tmp;
|
|
|
|
|
}
|
|
|
|
|
/*-- special case --*/
|
|
|
|
|
sum = 0.0F;
|
|
|
|
|
for (j = 0; j < 8; j++)
|
|
|
|
|
{
|
|
|
|
|
sum += (*coef++) * vbuf[bx];
|
|
|
|
|
bx += 32;
|
|
|
|
|
}
|
|
|
|
|
tmp = (long) sum;
|
|
|
|
|
if (tmp > 32767)
|
|
|
|
|
tmp = 32767;
|
|
|
|
|
else if (tmp < -32768)
|
|
|
|
|
tmp = -32768;
|
|
|
|
|
*pcm++ = tmp;
|
|
|
|
|
/*-- last 7 --*/
|
|
|
|
|
coef = wincoef + 255; /* back pass through coefs */
|
|
|
|
|
for (i = 0; i < 7; i++)
|
|
|
|
|
{
|
|
|
|
|
coef -= 16;
|
|
|
|
|
si--;
|
|
|
|
|
bx++;
|
|
|
|
|
sum = 0.0F;
|
|
|
|
|
for (j = 0; j < 8; j++)
|
|
|
|
|
{
|
|
|
|
|
sum += (*coef--) * vbuf[si];
|
|
|
|
|
si += 32;
|
|
|
|
|
sum += (*coef--) * vbuf[bx];
|
|
|
|
|
bx += 32;
|
|
|
|
|
}
|
|
|
|
|
tmp = (long) sum;
|
|
|
|
|
if (tmp > 32767)
|
|
|
|
|
tmp = 32767;
|
|
|
|
|
else if (tmp < -32768)
|
|
|
|
|
tmp = -32768;
|
|
|
|
|
*pcm++ = tmp;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
/*--------------- 16 pt dual window (interleaved output) -----------------*/
|
|
|
|
|
void window16_dual(float *vbuf, int vb_ptr, short *pcm)
|
|
|
|
|
{
|
|
|
|
|
int i, j;
|
|
|
|
|
unsigned char si, bx;
|
|
|
|
|
const float *coef;
|
|
|
|
|
float sum;
|
|
|
|
|
long tmp;
|
|
|
|
|
|
|
|
|
|
si = vb_ptr + 8;
|
|
|
|
|
bx = si + 16;
|
|
|
|
|
coef = wincoef;
|
|
|
|
|
|
|
|
|
|
/*-- first 8 --*/
|
|
|
|
|
for (i = 0; i < 8; i++)
|
|
|
|
|
{
|
|
|
|
|
sum = 0.0F;
|
|
|
|
|
for (j = 0; j < 8; j++)
|
|
|
|
|
{
|
|
|
|
|
sum += (*coef++) * vbuf[si];
|
|
|
|
|
si += 32;
|
|
|
|
|
sum -= (*coef++) * vbuf[bx];
|
|
|
|
|
bx += 32;
|
|
|
|
|
}
|
|
|
|
|
si++;
|
|
|
|
|
bx--;
|
|
|
|
|
coef += 16;
|
|
|
|
|
tmp = (long) sum;
|
|
|
|
|
if (tmp > 32767)
|
|
|
|
|
tmp = 32767;
|
|
|
|
|
else if (tmp < -32768)
|
|
|
|
|
tmp = -32768;
|
|
|
|
|
*pcm = tmp;
|
|
|
|
|
pcm += 2;
|
|
|
|
|
}
|
|
|
|
|
/*-- special case --*/
|
|
|
|
|
sum = 0.0F;
|
|
|
|
|
for (j = 0; j < 8; j++)
|
|
|
|
|
{
|
|
|
|
|
sum += (*coef++) * vbuf[bx];
|
|
|
|
|
bx += 32;
|
|
|
|
|
}
|
|
|
|
|
tmp = (long) sum;
|
|
|
|
|
if (tmp > 32767)
|
|
|
|
|
tmp = 32767;
|
|
|
|
|
else if (tmp < -32768)
|
|
|
|
|
tmp = -32768;
|
|
|
|
|
*pcm = tmp;
|
|
|
|
|
pcm += 2;
|
|
|
|
|
/*-- last 7 --*/
|
|
|
|
|
coef = wincoef + 255; /* back pass through coefs */
|
|
|
|
|
for (i = 0; i < 7; i++)
|
|
|
|
|
{
|
|
|
|
|
coef -= 16;
|
|
|
|
|
si--;
|
|
|
|
|
bx++;
|
|
|
|
|
sum = 0.0F;
|
|
|
|
|
for (j = 0; j < 8; j++)
|
|
|
|
|
{
|
|
|
|
|
sum += (*coef--) * vbuf[si];
|
|
|
|
|
si += 32;
|
|
|
|
|
sum += (*coef--) * vbuf[bx];
|
|
|
|
|
bx += 32;
|
|
|
|
|
}
|
|
|
|
|
tmp = (long) sum;
|
|
|
|
|
if (tmp > 32767)
|
|
|
|
|
tmp = 32767;
|
|
|
|
|
else if (tmp < -32768)
|
|
|
|
|
tmp = -32768;
|
|
|
|
|
*pcm = tmp;
|
|
|
|
|
pcm += 2;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
/*------------------- 8 pt window ------------------------------*/
|
|
|
|
|
void window8(float *vbuf, int vb_ptr, short *pcm)
|
|
|
|
|
{
|
|
|
|
|
int i, j;
|
|
|
|
|
int si, bx;
|
|
|
|
|
const float *coef;
|
|
|
|
|
float sum;
|
|
|
|
|
long tmp;
|
|
|
|
|
|
|
|
|
|
si = vb_ptr + 4;
|
|
|
|
|
bx = (si + 8) & 127;
|
|
|
|
|
coef = wincoef;
|
|
|
|
|
|
|
|
|
|
/*-- first 4 --*/
|
|
|
|
|
for (i = 0; i < 4; i++)
|
|
|
|
|
{
|
|
|
|
|
sum = 0.0F;
|
|
|
|
|
for (j = 0; j < 8; j++)
|
|
|
|
|
{
|
|
|
|
|
sum += (*coef++) * vbuf[si];
|
|
|
|
|
si = (si + 16) & 127;
|
|
|
|
|
sum -= (*coef++) * vbuf[bx];
|
|
|
|
|
bx = (bx + 16) & 127;
|
|
|
|
|
}
|
|
|
|
|
si++;
|
|
|
|
|
bx--;
|
|
|
|
|
coef += 48;
|
|
|
|
|
tmp = (long) sum;
|
|
|
|
|
if (tmp > 32767)
|
|
|
|
|
tmp = 32767;
|
|
|
|
|
else if (tmp < -32768)
|
|
|
|
|
tmp = -32768;
|
|
|
|
|
*pcm++ = tmp;
|
|
|
|
|
}
|
|
|
|
|
/*-- special case --*/
|
|
|
|
|
sum = 0.0F;
|
|
|
|
|
for (j = 0; j < 8; j++)
|
|
|
|
|
{
|
|
|
|
|
sum += (*coef++) * vbuf[bx];
|
|
|
|
|
bx = (bx + 16) & 127;
|
|
|
|
|
}
|
|
|
|
|
tmp = (long) sum;
|
|
|
|
|
if (tmp > 32767)
|
|
|
|
|
tmp = 32767;
|
|
|
|
|
else if (tmp < -32768)
|
|
|
|
|
tmp = -32768;
|
|
|
|
|
*pcm++ = tmp;
|
|
|
|
|
/*-- last 3 --*/
|
|
|
|
|
coef = wincoef + 255; /* back pass through coefs */
|
|
|
|
|
for (i = 0; i < 3; i++)
|
|
|
|
|
{
|
|
|
|
|
coef -= 48;
|
|
|
|
|
si--;
|
|
|
|
|
bx++;
|
|
|
|
|
sum = 0.0F;
|
|
|
|
|
for (j = 0; j < 8; j++)
|
|
|
|
|
{
|
|
|
|
|
sum += (*coef--) * vbuf[si];
|
|
|
|
|
si = (si + 16) & 127;
|
|
|
|
|
sum += (*coef--) * vbuf[bx];
|
|
|
|
|
bx = (bx + 16) & 127;
|
|
|
|
|
}
|
|
|
|
|
tmp = (long) sum;
|
|
|
|
|
if (tmp > 32767)
|
|
|
|
|
tmp = 32767;
|
|
|
|
|
else if (tmp < -32768)
|
|
|
|
|
tmp = -32768;
|
|
|
|
|
*pcm++ = tmp;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
/*--------------- 8 pt dual window (interleaved output) -----------------*/
|
|
|
|
|
void window8_dual(float *vbuf, int vb_ptr, short *pcm)
|
|
|
|
|
{
|
|
|
|
|
int i, j;
|
|
|
|
|
int si, bx;
|
|
|
|
|
const float *coef;
|
|
|
|
|
float sum;
|
|
|
|
|
long tmp;
|
|
|
|
|
|
|
|
|
|
si = vb_ptr + 4;
|
|
|
|
|
bx = (si + 8) & 127;
|
|
|
|
|
coef = wincoef;
|
|
|
|
|
|
|
|
|
|
/*-- first 4 --*/
|
|
|
|
|
for (i = 0; i < 4; i++)
|
|
|
|
|
{
|
|
|
|
|
sum = 0.0F;
|
|
|
|
|
for (j = 0; j < 8; j++)
|
|
|
|
|
{
|
|
|
|
|
sum += (*coef++) * vbuf[si];
|
|
|
|
|
si = (si + 16) & 127;
|
|
|
|
|
sum -= (*coef++) * vbuf[bx];
|
|
|
|
|
bx = (bx + 16) & 127;
|
|
|
|
|
}
|
|
|
|
|
si++;
|
|
|
|
|
bx--;
|
|
|
|
|
coef += 48;
|
|
|
|
|
tmp = (long) sum;
|
|
|
|
|
if (tmp > 32767)
|
|
|
|
|
tmp = 32767;
|
|
|
|
|
else if (tmp < -32768)
|
|
|
|
|
tmp = -32768;
|
|
|
|
|
*pcm = tmp;
|
|
|
|
|
pcm += 2;
|
|
|
|
|
}
|
|
|
|
|
/*-- special case --*/
|
|
|
|
|
sum = 0.0F;
|
|
|
|
|
for (j = 0; j < 8; j++)
|
|
|
|
|
{
|
|
|
|
|
sum += (*coef++) * vbuf[bx];
|
|
|
|
|
bx = (bx + 16) & 127;
|
|
|
|
|
}
|
|
|
|
|
tmp = (long) sum;
|
|
|
|
|
if (tmp > 32767)
|
|
|
|
|
tmp = 32767;
|
|
|
|
|
else if (tmp < -32768)
|
|
|
|
|
tmp = -32768;
|
|
|
|
|
*pcm = tmp;
|
|
|
|
|
pcm += 2;
|
|
|
|
|
/*-- last 3 --*/
|
|
|
|
|
coef = wincoef + 255; /* back pass through coefs */
|
|
|
|
|
for (i = 0; i < 3; i++)
|
|
|
|
|
{
|
|
|
|
|
coef -= 48;
|
|
|
|
|
si--;
|
|
|
|
|
bx++;
|
|
|
|
|
sum = 0.0F;
|
|
|
|
|
for (j = 0; j < 8; j++)
|
|
|
|
|
{
|
|
|
|
|
sum += (*coef--) * vbuf[si];
|
|
|
|
|
si = (si + 16) & 127;
|
|
|
|
|
sum += (*coef--) * vbuf[bx];
|
|
|
|
|
bx = (bx + 16) & 127;
|
|
|
|
|
}
|
|
|
|
|
tmp = (long) sum;
|
|
|
|
|
if (tmp > 32767)
|
|
|
|
|
tmp = 32767;
|
|
|
|
|
else if (tmp < -32768)
|
|
|
|
|
tmp = -32768;
|
|
|
|
|
*pcm = tmp;
|
|
|
|
|
pcm += 2;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
/*------------------------------------------------------------*/
|
|
|
|
|
#endif // #ifdef COMPILE_ME
|
