gstreamer/gst-libs/gst/resample/functable.c

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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 "private.h"
double functable_sinc(void *p,double x)
{
if(x==0)return 1;
return sin(x)/x;
}
double functable_dsinc(void *p,double x)
{
if(x==0)return 0;
return cos(x)/x - sin(x)/(x*x);
}
double functable_window_boxcar(void *p,double x)
{
if(x<-1 || x>1)return 0;
return 1;
}
double functable_window_dboxcar(void *p,double x)
{
return 0;
}
double functable_window_std(void *p,double x)
{
if(x<-1 || x>1)return 0;
return (1-x*x)*(1-x*x);
}
double functable_window_dstd(void *p,double x)
{
if(x<-1 || x>1)return 0;
return -4*x*(1-x*x);
}
void functable_init(functable_t *t)
{
int i;
double x;
t->fx = malloc(sizeof(double)*(t->len+1));
t->fdx = malloc(sizeof(double)*(t->len+1));
t->invoffset = 1.0 / t->offset;
for(i=0;i<t->len+1;i++){
x = t->start + t->offset * i;
x *= t->scale;
t->fx[i] = t->func_x(t->priv,x);
t->fdx[i] = t->scale * t->func_dx(t->priv,x);
}
if(t->func2_x){
double f1x,f1dx;
double f2x,f2dx;
for(i=0;i<t->len+1;i++){
x = t->start + t->offset * i;
x *= t->scale2;
f2x = t->func2_x(t->priv,x);
f2dx = t->scale2 * t->func2_dx(t->priv,x);
f1x = t->fx[i];
f1dx = t->fdx[i];
t->fx[i] = f1x * f2x;
t->fdx[i] = f1x * f2dx + f1dx * f2x;
}
}
}
double functable_eval(functable_t *t,double x)
{
int i;
double f0, f1, w0, w1;
double x2, x3;
double w;
if(x<t->start || x>(t->start+(t->len+1)*t->offset)){
printf("x out of range %g\n",x);
}
x -= t->start;
x /= t->offset;
i = floor(x);
x -= i;
x2 = x * x;
x3 = x2 * x;
f1 = 3 * x2 - 2 * x3;
f0 = 1 - f1;
w0 = (x - 2 * x2 + x3) * t->offset;
w1 = (-x2 + x3) * t->offset;
/*printf("i=%d x=%g f0=%g f1=%g w0=%g w1=%g\n",i,x,f0,f1,w0,w1); */
w = t->fx[i] * f0 + t->fx[i + 1] * f1 +
t->fdx[i] * w0 + t->fdx[i + 1] * w1;
/*w = t->fx[i] * (1-x) + t->fx[i+1] * x; */
return w;
}
double functable_fir(functable_t *t, double x, int n, double *data, int len)
{
int i,j;
double f0, f1, w0, w1;
double x2, x3;
double w;
double sum;
x -= t->start;
x /= t->offset;
i = floor(x);
x -= i;
x2 = x * x;
x3 = x2 * x;
f1 = 3 * x2 - 2 * x3;
f0 = 1 - f1;
w0 = (x - 2 * x2 + x3) * t->offset;
w1 = (-x2 + x3) * t->offset;
sum = 0;
for(j=0;j<len;j++){
w = t->fx[i] * f0 + t->fx[i + 1] * f1 +
t->fdx[i] * w0 + t->fdx[i + 1] * w1;
sum += data[j*2] * w;
i += n;
}
return sum;
}
void functable_fir2(functable_t *t, double *r0, double *r1, double x,
int n, double *data, int len)
{
int i,j;
double f0, f1, w0, w1;
double x2, x3;
double w;
double sum0, sum1;
double floor_x;
x -= t->start;
x *= t->invoffset;
floor_x = floor(x);
i = floor_x;
x -= floor_x;
x2 = x * x;
x3 = x2 * x;
f1 = 3 * x2 - 2 * x3;
f0 = 1 - f1;
w0 = (x - 2 * x2 + x3) * t->offset;
w1 = (-x2 + x3) * t->offset;
sum0 = 0;
sum1 = 0;
for(j=0;j<len;j++){
w = t->fx[i] * f0 + t->fx[i + 1] * f1 +
t->fdx[i] * w0 + t->fdx[i + 1] * w1;
sum0 += data[j*2] * w;
sum1 += data[j*2+1] * w;
i += n;
#define unroll2
#define unroll3
#define unroll4
#ifdef unroll2
j++;
w = t->fx[i] * f0 + t->fx[i + 1] * f1 +
t->fdx[i] * w0 + t->fdx[i + 1] * w1;
sum0 += data[j*2] * w;
sum1 += data[j*2+1] * w;
i += n;
#endif
#ifdef unroll3
j++;
w = t->fx[i] * f0 + t->fx[i + 1] * f1 +
t->fdx[i] * w0 + t->fdx[i + 1] * w1;
sum0 += data[j*2] * w;
sum1 += data[j*2+1] * w;
i += n;
#endif
#ifdef unroll4
j++;
w = t->fx[i] * f0 + t->fx[i + 1] * f1 +
t->fdx[i] * w0 + t->fdx[i + 1] * w1;
sum0 += data[j*2] * w;
sum1 += data[j*2+1] * w;
i += n;
#endif
}
*r0 = sum0;
*r1 = sum1;
}
#ifdef unused
void functable_fir2_altivec(functable_t *t, float *r0, float *r1,
double x, int n, float *data, int len)
{
int i,j;
double f0, f1, w0, w1;
double x2, x3;
double w;
double sum0, sum1;
double floor_x;
x -= t->start;
x *= t->invoffset;
floor_x = floor(x);
i = floor_x;
x -= floor_x;
x2 = x * x;
x3 = x2 * x;
f1 = 3 * x2 - 2 * x3;
f0 = 1 - f1;
w0 = (x - 2 * x2 + x3) * t->offset;
w1 = (-x2 + x3) * t->offset;
sum0 = 0;
sum1 = 0;
for(j=0;j<len;j++){
/* t->fx, t->fdx needs to be multiplexed by n */
/* we need 5 consecutive floats, which fit into 2 vecs */
/* load v0, t->fx[i] */
/* load v1, t->fx[i+n] */
/* v2 = v0 (not correct) */
/* v3 = (v0>>32) || (v1<<3*32) (not correct) */
/* */
/* load v4, t->dfx[i] */
/* load v5, t->dfx[i+n] */
/* v6 = v4 (not correct) */
/* v7 = (v4>>32) || (v5<<3*32) (not correct) */
/* */
/* v8 = splat(f0) */
/* v9 = splat(f1) */
/* v10 = splat(w0) */
/* v11 = splat(w1) */
/* */
/* v12 = v2 * v8 */
/* v12 += v3 * v9 */
/* v12 += v6 * v10 */
/* v12 += v7 * v11 */
w = t->fx[i] * f0 + t->fx[i + 1] * f1 +
t->fdx[i] * w0 + t->fdx[i + 1] * w1;
/* v13 = data[j*2] */
/* v14 = data[j*2+4] */
/* v15 = deinterlace_high(v13,v14) */
/* v16 = deinterlace_low(v13,v14) */
/* (sum0) v17 += multsum(v13,v15) */
/* (sum1) v18 += multsum(v14,v16) */
sum0 += data[j*2] * w;
sum1 += data[j*2+1] * w;
i += n;
}
*r0 = sum0;
*r1 = sum1;
}
#endif