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322 lines
6.3 KiB
C
322 lines
6.3 KiB
C
/* Resampling library
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* Copyright (C) <2001> David A. Schleef <ds@schleef.org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <string.h>
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#include <math.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "private.h"
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double
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functable_sinc (void *p, double x)
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{
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if (x == 0)
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return 1;
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return sin (x) / x;
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}
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double
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functable_dsinc (void *p, double x)
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{
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if (x == 0)
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return 0;
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return cos (x) / x - sin (x) / (x * x);
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}
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double
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functable_window_boxcar (void *p, double x)
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{
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if (x < -1 || x > 1)
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return 0;
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return 1;
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}
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double
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functable_window_dboxcar (void *p, double x)
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{
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return 0;
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}
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double
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functable_window_std (void *p, double x)
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{
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if (x < -1 || x > 1)
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return 0;
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return (1 - x * x) * (1 - x * x);
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}
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double
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functable_window_dstd (void *p, double x)
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{
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if (x < -1 || x > 1)
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return 0;
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return -4 * x * (1 - x * x);
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}
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void
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functable_init (functable_t * t)
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{
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int i;
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double x;
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t->fx = malloc (sizeof (double) * (t->len + 1));
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t->fdx = malloc (sizeof (double) * (t->len + 1));
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t->invoffset = 1.0 / t->offset;
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for (i = 0; i < t->len + 1; i++) {
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x = t->start + t->offset * i;
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x *= t->scale;
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t->fx[i] = t->func_x (t->priv, x);
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t->fdx[i] = t->scale * t->func_dx (t->priv, x);
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}
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if (t->func2_x) {
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double f1x, f1dx;
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double f2x, f2dx;
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for (i = 0; i < t->len + 1; i++) {
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x = t->start + t->offset * i;
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x *= t->scale2;
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f2x = t->func2_x (t->priv, x);
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f2dx = t->scale2 * t->func2_dx (t->priv, x);
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f1x = t->fx[i];
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f1dx = t->fdx[i];
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t->fx[i] = f1x * f2x;
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t->fdx[i] = f1x * f2dx + f1dx * f2x;
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}
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}
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}
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double
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functable_eval (functable_t * t, double x)
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{
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int i;
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double f0, f1, w0, w1;
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double x2, x3;
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double w;
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if (x < t->start || x > (t->start + (t->len + 1) * t->offset)) {
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printf ("x out of range %g\n", x);
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}
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x -= t->start;
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x /= t->offset;
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i = floor (x);
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x -= i;
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x2 = x * x;
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x3 = x2 * x;
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f1 = 3 * x2 - 2 * x3;
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f0 = 1 - f1;
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w0 = (x - 2 * x2 + x3) * t->offset;
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w1 = (-x2 + x3) * t->offset;
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/*printf("i=%d x=%g f0=%g f1=%g w0=%g w1=%g\n",i,x,f0,f1,w0,w1); */
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w = t->fx[i] * f0 + t->fx[i + 1] * f1 + t->fdx[i] * w0 + t->fdx[i + 1] * w1;
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/*w = t->fx[i] * (1-x) + t->fx[i+1] * x; */
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return w;
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}
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double
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functable_fir (functable_t * t, double x, int n, double *data, int len)
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{
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int i, j;
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double f0, f1, w0, w1;
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double x2, x3;
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double w;
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double sum;
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x -= t->start;
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x /= t->offset;
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i = floor (x);
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x -= i;
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x2 = x * x;
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x3 = x2 * x;
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f1 = 3 * x2 - 2 * x3;
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f0 = 1 - f1;
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w0 = (x - 2 * x2 + x3) * t->offset;
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w1 = (-x2 + x3) * t->offset;
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sum = 0;
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for (j = 0; j < len; j++) {
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w = t->fx[i] * f0 + t->fx[i + 1] * f1 + t->fdx[i] * w0 + t->fdx[i + 1] * w1;
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sum += data[j * 2] * w;
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i += n;
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}
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return sum;
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}
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void
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functable_fir2 (functable_t * t, double *r0, double *r1, double x,
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int n, double *data, int len)
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{
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int i, j;
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double f0, f1, w0, w1;
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double x2, x3;
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double w;
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double sum0, sum1;
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double floor_x;
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x -= t->start;
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x *= t->invoffset;
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floor_x = floor (x);
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i = floor_x;
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x -= floor_x;
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x2 = x * x;
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x3 = x2 * x;
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f1 = 3 * x2 - 2 * x3;
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f0 = 1 - f1;
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w0 = (x - 2 * x2 + x3) * t->offset;
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w1 = (-x2 + x3) * t->offset;
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sum0 = 0;
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sum1 = 0;
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for (j = 0; j < len; j++) {
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w = t->fx[i] * f0 + t->fx[i + 1] * f1 + t->fdx[i] * w0 + t->fdx[i + 1] * w1;
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sum0 += data[j * 2] * w;
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sum1 += data[j * 2 + 1] * w;
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i += n;
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#define unroll2
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#define unroll3
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#define unroll4
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#ifdef unroll2
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j++;
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w = t->fx[i] * f0 + t->fx[i + 1] * f1 + t->fdx[i] * w0 + t->fdx[i + 1] * w1;
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sum0 += data[j * 2] * w;
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sum1 += data[j * 2 + 1] * w;
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i += n;
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#endif
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#ifdef unroll3
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j++;
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w = t->fx[i] * f0 + t->fx[i + 1] * f1 + t->fdx[i] * w0 + t->fdx[i + 1] * w1;
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sum0 += data[j * 2] * w;
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sum1 += data[j * 2 + 1] * w;
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i += n;
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#endif
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#ifdef unroll4
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j++;
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w = t->fx[i] * f0 + t->fx[i + 1] * f1 + t->fdx[i] * w0 + t->fdx[i + 1] * w1;
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sum0 += data[j * 2] * w;
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sum1 += data[j * 2 + 1] * w;
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i += n;
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#endif
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}
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*r0 = sum0;
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*r1 = sum1;
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}
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#ifdef unused
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void
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functable_fir2_altivec (functable_t * t, float *r0, float *r1,
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double x, int n, float *data, int len)
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{
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int i, j;
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double f0, f1, w0, w1;
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double x2, x3;
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double w;
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double sum0, sum1;
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double floor_x;
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x -= t->start;
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x *= t->invoffset;
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floor_x = floor (x);
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i = floor_x;
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x -= floor_x;
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x2 = x * x;
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x3 = x2 * x;
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f1 = 3 * x2 - 2 * x3;
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f0 = 1 - f1;
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w0 = (x - 2 * x2 + x3) * t->offset;
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w1 = (-x2 + x3) * t->offset;
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sum0 = 0;
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sum1 = 0;
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for (j = 0; j < len; j++) {
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/* t->fx, t->fdx needs to be multiplexed by n */
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/* we need 5 consecutive floats, which fit into 2 vecs */
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/* load v0, t->fx[i] */
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/* load v1, t->fx[i+n] */
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/* v2 = v0 (not correct) */
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/* v3 = (v0>>32) || (v1<<3*32) (not correct) */
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/* */
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/* load v4, t->dfx[i] */
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/* load v5, t->dfx[i+n] */
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/* v6 = v4 (not correct) */
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/* v7 = (v4>>32) || (v5<<3*32) (not correct) */
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/* */
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/* v8 = splat(f0) */
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/* v9 = splat(f1) */
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/* v10 = splat(w0) */
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/* v11 = splat(w1) */
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/* */
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/* v12 = v2 * v8 */
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/* v12 += v3 * v9 */
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/* v12 += v6 * v10 */
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/* v12 += v7 * v11 */
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w = t->fx[i] * f0 + t->fx[i + 1] * f1 + t->fdx[i] * w0 + t->fdx[i + 1] * w1;
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/* v13 = data[j*2] */
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/* v14 = data[j*2+4] */
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/* v15 = deinterlace_high(v13,v14) */
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/* v16 = deinterlace_low(v13,v14) */
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/* (sum0) v17 += multsum(v13,v15) */
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/* (sum1) v18 += multsum(v14,v16) */
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sum0 += data[j * 2] * w;
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sum1 += data[j * 2 + 1] * w;
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i += n;
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}
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*r0 = sum0;
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*r1 = sum1;
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}
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#endif
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