+/*
+ * (c) 2002 Fabrice Bellard
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
/**
* @file fft-test.c
* FFT and MDCT tests.
#include <math.h>
#include <unistd.h>
#include <sys/time.h>
+#include <stdlib.h>
+#include <string.h>
+
+#undef exit
+#undef random
int mm_flags;
void fft_ref_init(int nbits, int inverse)
{
int n, i;
- float c1, s1, alpha;
+ double c1, s1, alpha;
n = 1 << nbits;
exptab = av_malloc((n / 2) * sizeof(FFTComplex));
void fft_ref(FFTComplex *tabr, FFTComplex *tab, int nbits)
{
int n, i, j, k, n2;
- float tmp_re, tmp_im, s, c;
+ double tmp_re, tmp_im, s, c;
FFTComplex *q;
n = 1 << nbits;
}
}
-void imdct_ref(float *out, float *in, int n)
+void imdct_ref(float *out, float *in, int nbits)
{
+ int n = 1<<nbits;
int k, i, a;
- float sum, f;
+ double sum, f;
for(i=0;i<n;i++) {
sum = 0;
}
/* NOTE: no normalisation by 1 / N is done */
-void mdct_ref(float *output, float *input, int n)
+void mdct_ref(float *output, float *input, int nbits)
{
+ int n = 1<<nbits;
int k, i;
- float a, s;
+ double a, s;
/* do it by hand */
for(k=0;k<n/2;k++) {
void check_diff(float *tab1, float *tab2, int n)
{
int i;
+ double max= 0;
+ double error= 0;
for(i=0;i<n;i++) {
- if (fabsf(tab1[i] - tab2[i]) >= 1e-3) {
- av_log(NULL, AV_LOG_ERROR, "ERROR %d: %f %f\n",
+ double e= fabsf(tab1[i] - tab2[i]);
+ if (e >= 1e-3) {
+ av_log(NULL, AV_LOG_ERROR, "ERROR %d: %f %f\n",
i, tab1[i], tab2[i]);
}
+ error+= e*e;
+ if(e>max) max= e;
}
+ av_log(NULL, AV_LOG_INFO, "max:%f e:%g\n", max, sqrt(error)/n);
}
if (do_mdct) {
if (do_inverse) {
- imdct_ref((float *)tab_ref, (float *)tab1, fft_size);
+ imdct_ref((float *)tab_ref, (float *)tab1, fft_nbits);
ff_imdct_calc(m, tab2, (float *)tab1, tabtmp);
check_diff((float *)tab_ref, tab2, fft_size);
} else {
- mdct_ref((float *)tab_ref, (float *)tab1, fft_size);
-
+ mdct_ref((float *)tab_ref, (float *)tab1, fft_nbits);
+
ff_mdct_calc(m, tab2, (float *)tab1, tabtmp);
check_diff((float *)tab_ref, tab2, fft_size / 2);
memcpy(tab, tab1, fft_size * sizeof(FFTComplex));
ff_fft_permute(s, tab);
ff_fft_calc(s, tab);
-
+
fft_ref(tab_ref, tab1, fft_nbits);
check_diff((float *)tab_ref, (float *)tab, fft_size * 2);
}
break;
nb_its *= 2;
}
- av_log(NULL, AV_LOG_INFO,"time: %0.1f us/transform [total time=%0.2f s its=%d]\n",
- (double)duration / nb_its,
+ av_log(NULL, AV_LOG_INFO,"time: %0.1f us/transform [total time=%0.2f s its=%d]\n",
+ (double)duration / nb_its,
(double)duration / 1000000.0,
nb_its);
}
-
+
if (do_mdct) {
ff_mdct_end(m);
} else {