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/* Resampling library
* Copyright (C) <2001> David A. Schleef <ds@schleef.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <string.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
/*#include <ml.h> */
#include <resample.h>
#include <config.h>
#define short_to_double_table
/*#define short_to_double_altivec */
#define short_to_double_unroll
#ifdef short_to_double_table
static float ints_high[256];
static float ints_low[256];
void conv_double_short_table(double *dest, short *src, int n)
{
static int init = 0;
int i;
unsigned int idx;
if(!init){
for(i=0;i<256;i++){
ints_high[i]=256.0*((i<128)?i:i-256);
ints_low[i]=i;
}
init = 1;
}
if(n&1){
idx = (unsigned short)*src++;
*dest++ = ints_high[(idx>>8)] + ints_low[(idx&0xff)];
n-=1;
}
for(i=0;i<n;i+=2){
idx = (unsigned short)*src++;
*dest++ = ints_high[(idx>>8)] + ints_low[(idx&0xff)];
idx = (unsigned short)*src++;
*dest++ = ints_high[(idx>>8)] + ints_low[(idx&0xff)];
}
}
#endif
#ifdef short_to_double_unroll
void conv_double_short_unroll(double *dest, short *src, int n)
{
if(n&1){
*dest++ = *src++;
n--;
}
if(n&2){
*dest++ = *src++;
*dest++ = *src++;
n-=2;
}
while(n>0){
*dest++ = *src++;
*dest++ = *src++;
*dest++ = *src++;
*dest++ = *src++;
n-=4;
}
}
#endif
void conv_double_short_ref(double *dest, short *src, int n)
{
int i;
for(i=0;i<n;i++){
dest[i]=src[i];
}
}
#ifdef HAVE_CPU_PPC
#if 0
static union { int i[4]; float f[4]; } av_tmp __attribute__ ((__aligned__ (16)));
void conv_double_short_altivec(double *dest, short *src, int n)
{
int i;
for(i=0;i<n;i+=4){
av_tmp.i[0] = src[0];
av_tmp.i[1] = src[1];
av_tmp.i[2] = src[2];
av_tmp.i[3] = src[3];
asm(
" lvx 0,0,%0\n"
" vcfsx 1,0,0\n"
" stvx 1,0,%0\n"
: : "r" (&av_tmp)
);
dest[0]=av_tmp.f[0];
dest[1]=av_tmp.f[1];
dest[2]=av_tmp.f[2];
dest[3]=av_tmp.f[3];
src += 4;
dest += 4;
}
}
#endif
#endif
/* double to short */
void conv_short_double_ref(short *dest, double *src, int n)
{
int i;
double x;
for(i=0;i<n;i++){
x = *src++;
if(x<-32768.0)x=-32768.0;
if(x>32767.0)x=32767.0;
*dest++ = rint(x);
}
}
#ifdef HAVE_CPU_PPC
void conv_short_double_ppcasm(short *dest, double *src, int n)
{
int tmp[2];
double min = -32768.0;
double max = 32767.0;
double ftmp0, ftmp1;
asm __volatile__(
"\taddic. %3,%3,-8\n"
"\taddic. %6,%6,-2\n"
"loop:\n"
"\tlfdu %0,8(%3)\n"
"\tfsub %1,%0,%4\n"
"\tfsel %0,%1,%0,%4\n"
"\tfsub %1,%0,%5\n"
"\tfsel %0,%1,%5,%0\n"
"\tfctiw %1,%0\n"
"\taddic. 5,5,-1\n"
"\tstfd %1,0(%2)\n"
"\tlhz 9,6(%2)\n"
"\tsthu 9,2(%6)\n"
"\tbne loop\n"
: "=&f" (ftmp0), "=&f" (ftmp1)
: "b" (tmp), "r" (src), "f" (min), "f" (max), "r" (dest)
: "r9", "r5" );
}
#endif
void conv_double_short_dstr(double *dest, short *src, int n, int dstr)
{
int i;
void *d = dest;
for(i=0;i<n;i++){
(*(double *)d)=*src++;
d += dstr;
}
}
void conv_short_double_sstr(short *dest, double *src, int n, int sstr)
{
int i;
double x;
void *s = src;
for(i=0;i<n;i++){
x = *(double *)s;
if(x<-32768.0)x=-32768.0;
if(x>32767.0)x=32767.0;
*dest++ = rint(x);
s += sstr;
}
}
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