+/*
+ * (c) 2002 Fabrice Bellard
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
/**
- * @file fft-test.c
+ * @file
* FFT and MDCT tests.
*/
-#include "dsputil.h"
+#include "libavutil/cpu.h"
+#include "libavutil/mathematics.h"
+#include "libavutil/lfg.h"
+#include "libavutil/log.h"
+#include "libavutil/time.h"
+#include "fft.h"
+#if CONFIG_FFT_FLOAT
+#include "dct.h"
+#include "rdft.h"
+#endif
#include <math.h>
+#if HAVE_UNISTD_H
#include <unistd.h>
-#include <sys/time.h>
-
-int mm_flags;
+#endif
+#include <stdlib.h>
+#include <string.h>
/* reference fft */
pim += (MUL16(are, bim) + MUL16(bre, aim));\
}
-FFTComplex *exptab;
-
-void fft_ref_init(int nbits, int inverse)
+#if CONFIG_FFT_FLOAT
+# define RANGE 1.0
+# define REF_SCALE(x, bits) (x)
+# define FMT "%10.6f"
+#else
+# define RANGE 16384
+# define REF_SCALE(x, bits) ((x) / (1<<(bits)))
+# define FMT "%6d"
+#endif
+
+struct {
+ float re, im;
+} *exptab;
+
+static 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));
+ exptab = av_malloc((n / 2) * sizeof(*exptab));
- for(i=0;i<(n/2);i++) {
+ for (i = 0; i < (n/2); i++) {
alpha = 2 * M_PI * (float)i / (float)n;
c1 = cos(alpha);
s1 = sin(alpha);
}
}
-void fft_ref(FFTComplex *tabr, FFTComplex *tab, int nbits)
+static 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;
n2 = n >> 1;
- for(i=0;i<n;i++) {
+ for (i = 0; i < n; i++) {
tmp_re = 0;
tmp_im = 0;
q = tab;
- for(j=0;j<n;j++) {
+ for (j = 0; j < n; j++) {
k = (i * j) & (n - 1);
if (k >= n2) {
c = -exptab[k - n2].re;
CMAC(tmp_re, tmp_im, c, s, q->re, q->im);
q++;
}
- tabr[i].re = tmp_re;
- tabr[i].im = tmp_im;
+ tabr[i].re = REF_SCALE(tmp_re, nbits);
+ tabr[i].im = REF_SCALE(tmp_im, nbits);
}
}
-void imdct_ref(float *out, float *in, int n)
+static void imdct_ref(FFTSample *out, FFTSample *in, int nbits)
{
+ int n = 1<<nbits;
int k, i, a;
- float sum, f;
+ double sum, f;
- for(i=0;i<n;i++) {
+ for (i = 0; i < n; i++) {
sum = 0;
- for(k=0;k<n/2;k++) {
+ for (k = 0; k < n/2; k++) {
a = (2 * i + 1 + (n / 2)) * (2 * k + 1);
f = cos(M_PI * a / (double)(2 * n));
sum += f * in[k];
}
- out[i] = -sum;
+ out[i] = REF_SCALE(-sum, nbits - 2);
}
}
/* NOTE: no normalisation by 1 / N is done */
-void mdct_ref(float *output, float *input, int n)
+static void mdct_ref(FFTSample *output, FFTSample *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++) {
+ for (k = 0; k < n/2; k++) {
s = 0;
- for(i=0;i<n;i++) {
+ for (i = 0; i < n; i++) {
a = (2*M_PI*(2*i+1+n/2)*(2*k+1) / (4 * n));
s += input[i] * cos(a);
}
- output[k] = s;
+ output[k] = REF_SCALE(s, nbits - 1);
}
}
+#if CONFIG_FFT_FLOAT
+static void idct_ref(float *output, float *input, int nbits)
+{
+ int n = 1<<nbits;
+ int k, i;
+ double a, s;
-float frandom(void)
+ /* do it by hand */
+ for (i = 0; i < n; i++) {
+ s = 0.5 * input[0];
+ for (k = 1; k < n; k++) {
+ a = M_PI*k*(i+0.5) / n;
+ s += input[k] * cos(a);
+ }
+ output[i] = 2 * s / n;
+ }
+}
+static void dct_ref(float *output, float *input, int nbits)
{
- return (float)((random() & 0xffff) - 32768) / 32768.0;
+ int n = 1<<nbits;
+ int k, i;
+ double a, s;
+
+ /* do it by hand */
+ for (k = 0; k < n; k++) {
+ s = 0;
+ for (i = 0; i < n; i++) {
+ a = M_PI*k*(i+0.5) / n;
+ s += input[i] * cos(a);
+ }
+ output[k] = s;
+ }
}
+#endif
+
-int64_t gettime(void)
+static FFTSample frandom(AVLFG *prng)
{
- struct timeval tv;
- gettimeofday(&tv,NULL);
- return (int64_t)tv.tv_sec * 1000000 + tv.tv_usec;
+ return (int16_t)av_lfg_get(prng) / 32768.0 * RANGE;
}
-void check_diff(float *tab1, float *tab2, int n)
+static int check_diff(FFTSample *tab1, FFTSample *tab2, int n, double scale)
{
int i;
-
- for(i=0;i<n;i++) {
- if (fabsf(tab1[i] - tab2[i]) >= 1e-3) {
- printf("ERROR %d: %f %f\n",
+ double max= 0;
+ double error= 0;
+ int err = 0;
+
+ for (i = 0; i < n; i++) {
+ double e = fabsf(tab1[i] - (tab2[i] / scale)) / RANGE;
+ if (e >= 1e-3) {
+ av_log(NULL, AV_LOG_ERROR, "ERROR %5d: "FMT" "FMT"\n",
i, tab1[i], tab2[i]);
+ err = 1;
}
+ error+= e*e;
+ if(e>max) max= e;
}
+ av_log(NULL, AV_LOG_INFO, "max:%f e:%g\n", max, sqrt(error)/n);
+ return err;
}
-void help(void)
+static void help(void)
{
- printf("usage: fft-test [-h] [-s] [-i] [-n b]\n"
+ av_log(NULL, AV_LOG_INFO,"usage: fft-test [-h] [-s] [-i] [-n b]\n"
"-h print this help\n"
"-s speed test\n"
"-m (I)MDCT test\n"
+ "-d (I)DCT test\n"
+ "-r (I)RDFT test\n"
"-i inverse transform test\n"
"-n b set the transform size to 2^b\n"
+ "-f x set scale factor for output data of (I)MDCT to x\n"
);
- exit(1);
}
+enum tf_transform {
+ TRANSFORM_FFT,
+ TRANSFORM_MDCT,
+ TRANSFORM_RDFT,
+ TRANSFORM_DCT,
+};
+#if !HAVE_GETOPT
+#include "compat/getopt.c"
+#endif
int main(int argc, char **argv)
{
FFTComplex *tab, *tab1, *tab_ref;
- FFTSample *tabtmp, *tab2;
+ FFTSample *tab2;
int it, i, c;
+ int cpuflags;
int do_speed = 0;
- int do_mdct = 0;
+ int err = 1;
+ enum tf_transform transform = TRANSFORM_FFT;
int do_inverse = 0;
FFTContext s1, *s = &s1;
- MDCTContext m1, *m = &m1;
+ FFTContext m1, *m = &m1;
+#if CONFIG_FFT_FLOAT
+ RDFTContext r1, *r = &r1;
+ DCTContext d1, *d = &d1;
+ int fft_size_2;
+#endif
int fft_nbits, fft_size;
+ double scale = 1.0;
+ AVLFG prng;
+ av_lfg_init(&prng, 1);
- mm_flags = 0;
fft_nbits = 9;
for(;;) {
- c = getopt(argc, argv, "hsimn:");
+ c = getopt(argc, argv, "hsimrdn:f:c:");
if (c == -1)
break;
switch(c) {
case 'h':
help();
- break;
+ return 1;
case 's':
do_speed = 1;
break;
do_inverse = 1;
break;
case 'm':
- do_mdct = 1;
+ transform = TRANSFORM_MDCT;
+ break;
+ case 'r':
+ transform = TRANSFORM_RDFT;
+ break;
+ case 'd':
+ transform = TRANSFORM_DCT;
break;
case 'n':
fft_nbits = atoi(optarg);
break;
+ case 'f':
+ scale = atof(optarg);
+ break;
+ case 'c':
+ cpuflags = av_parse_cpu_flags(optarg);
+ if (cpuflags < 0)
+ return 1;
+ av_set_cpu_flags_mask(cpuflags);
+ break;
}
}
tab = av_malloc(fft_size * sizeof(FFTComplex));
tab1 = av_malloc(fft_size * sizeof(FFTComplex));
tab_ref = av_malloc(fft_size * sizeof(FFTComplex));
- tabtmp = av_malloc(fft_size / 2 * sizeof(FFTSample));
tab2 = av_malloc(fft_size * sizeof(FFTSample));
- if (do_mdct) {
+ switch (transform) {
+ case TRANSFORM_MDCT:
+ av_log(NULL, AV_LOG_INFO,"Scale factor is set to %f\n", scale);
+ if (do_inverse)
+ av_log(NULL, AV_LOG_INFO,"IMDCT");
+ else
+ av_log(NULL, AV_LOG_INFO,"MDCT");
+ ff_mdct_init(m, fft_nbits, do_inverse, scale);
+ break;
+ case TRANSFORM_FFT:
if (do_inverse)
- printf("IMDCT");
+ av_log(NULL, AV_LOG_INFO,"IFFT");
else
- printf("MDCT");
- ff_mdct_init(m, fft_nbits, do_inverse);
- } else {
+ av_log(NULL, AV_LOG_INFO,"FFT");
+ ff_fft_init(s, fft_nbits, do_inverse);
+ fft_ref_init(fft_nbits, do_inverse);
+ break;
+#if CONFIG_FFT_FLOAT
+ case TRANSFORM_RDFT:
if (do_inverse)
- printf("IFFT");
+ av_log(NULL, AV_LOG_INFO,"IDFT_C2R");
else
- printf("FFT");
- fft_init(s, fft_nbits, do_inverse);
+ av_log(NULL, AV_LOG_INFO,"DFT_R2C");
+ ff_rdft_init(r, fft_nbits, do_inverse ? IDFT_C2R : DFT_R2C);
fft_ref_init(fft_nbits, do_inverse);
+ break;
+ case TRANSFORM_DCT:
+ if (do_inverse)
+ av_log(NULL, AV_LOG_INFO,"DCT_III");
+ else
+ av_log(NULL, AV_LOG_INFO,"DCT_II");
+ ff_dct_init(d, fft_nbits, do_inverse ? DCT_III : DCT_II);
+ break;
+#endif
+ default:
+ av_log(NULL, AV_LOG_ERROR, "Requested transform not supported\n");
+ return 1;
}
- printf(" %d test\n", fft_size);
+ av_log(NULL, AV_LOG_INFO," %d test\n", fft_size);
/* generate random data */
- for(i=0;i<fft_size;i++) {
- tab1[i].re = frandom();
- tab1[i].im = frandom();
+ for (i = 0; i < fft_size; i++) {
+ tab1[i].re = frandom(&prng);
+ tab1[i].im = frandom(&prng);
}
/* checking result */
- printf("Checking...\n");
+ av_log(NULL, AV_LOG_INFO,"Checking...\n");
- if (do_mdct) {
+ switch (transform) {
+ case TRANSFORM_MDCT:
if (do_inverse) {
- imdct_ref((float *)tab_ref, (float *)tab1, fft_size);
- ff_imdct_calc(m, tab2, (float *)tab1, tabtmp);
- check_diff((float *)tab_ref, tab2, fft_size);
+ imdct_ref((FFTSample *)tab_ref, (FFTSample *)tab1, fft_nbits);
+ m->imdct_calc(m, tab2, (FFTSample *)tab1);
+ err = check_diff((FFTSample *)tab_ref, tab2, fft_size, scale);
} else {
- mdct_ref((float *)tab_ref, (float *)tab1, fft_size);
-
- ff_mdct_calc(m, tab2, (float *)tab1, tabtmp);
+ mdct_ref((FFTSample *)tab_ref, (FFTSample *)tab1, fft_nbits);
+
+ m->mdct_calc(m, tab2, (FFTSample *)tab1);
- check_diff((float *)tab_ref, tab2, fft_size / 2);
+ err = check_diff((FFTSample *)tab_ref, tab2, fft_size / 2, scale);
}
- } else {
+ break;
+ case TRANSFORM_FFT:
memcpy(tab, tab1, fft_size * sizeof(FFTComplex));
- fft_permute(s, tab);
- fft_calc(s, tab);
-
+ s->fft_permute(s, tab);
+ s->fft_calc(s, tab);
+
fft_ref(tab_ref, tab1, fft_nbits);
- check_diff((float *)tab_ref, (float *)tab, fft_size * 2);
+ err = check_diff((FFTSample *)tab_ref, (FFTSample *)tab, fft_size * 2, 1.0);
+ break;
+#if CONFIG_FFT_FLOAT
+ case TRANSFORM_RDFT:
+ fft_size_2 = fft_size >> 1;
+ if (do_inverse) {
+ tab1[ 0].im = 0;
+ tab1[fft_size_2].im = 0;
+ for (i = 1; i < fft_size_2; i++) {
+ tab1[fft_size_2+i].re = tab1[fft_size_2-i].re;
+ tab1[fft_size_2+i].im = -tab1[fft_size_2-i].im;
+ }
+
+ memcpy(tab2, tab1, fft_size * sizeof(FFTSample));
+ tab2[1] = tab1[fft_size_2].re;
+
+ r->rdft_calc(r, tab2);
+ fft_ref(tab_ref, tab1, fft_nbits);
+ for (i = 0; i < fft_size; i++) {
+ tab[i].re = tab2[i];
+ tab[i].im = 0;
+ }
+ err = check_diff((float *)tab_ref, (float *)tab, fft_size * 2, 0.5);
+ } else {
+ for (i = 0; i < fft_size; i++) {
+ tab2[i] = tab1[i].re;
+ tab1[i].im = 0;
+ }
+ r->rdft_calc(r, tab2);
+ fft_ref(tab_ref, tab1, fft_nbits);
+ tab_ref[0].im = tab_ref[fft_size_2].re;
+ err = check_diff((float *)tab_ref, (float *)tab2, fft_size, 1.0);
+ }
+ break;
+ case TRANSFORM_DCT:
+ memcpy(tab, tab1, fft_size * sizeof(FFTComplex));
+ d->dct_calc(d, tab);
+ if (do_inverse) {
+ idct_ref(tab_ref, tab1, fft_nbits);
+ } else {
+ dct_ref(tab_ref, tab1, fft_nbits);
+ }
+ err = check_diff((float *)tab_ref, (float *)tab, fft_size, 1.0);
+ break;
+#endif
}
/* do a speed test */
int64_t time_start, duration;
int nb_its;
- printf("Speed test...\n");
+ av_log(NULL, AV_LOG_INFO,"Speed test...\n");
/* we measure during about 1 seconds */
nb_its = 1;
for(;;) {
- time_start = gettime();
- for(it=0;it<nb_its;it++) {
- if (do_mdct) {
+ time_start = av_gettime();
+ for (it = 0; it < nb_its; it++) {
+ switch (transform) {
+ case TRANSFORM_MDCT:
if (do_inverse) {
- ff_imdct_calc(m, (float *)tab, (float *)tab1, tabtmp);
+ m->imdct_calc(m, (FFTSample *)tab, (FFTSample *)tab1);
} else {
- ff_mdct_calc(m, (float *)tab, (float *)tab1, tabtmp);
+ m->mdct_calc(m, (FFTSample *)tab, (FFTSample *)tab1);
}
- } else {
+ break;
+ case TRANSFORM_FFT:
memcpy(tab, tab1, fft_size * sizeof(FFTComplex));
- fft_calc(s, tab);
+ s->fft_calc(s, tab);
+ break;
+#if CONFIG_FFT_FLOAT
+ case TRANSFORM_RDFT:
+ memcpy(tab2, tab1, fft_size * sizeof(FFTSample));
+ r->rdft_calc(r, tab2);
+ break;
+ case TRANSFORM_DCT:
+ memcpy(tab2, tab1, fft_size * sizeof(FFTSample));
+ d->dct_calc(d, tab2);
+ break;
+#endif
}
}
- duration = gettime() - time_start;
+ duration = av_gettime() - time_start;
if (duration >= 1000000)
break;
nb_its *= 2;
}
- printf("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) {
+
+ switch (transform) {
+ case TRANSFORM_MDCT:
ff_mdct_end(m);
- } else {
- fft_end(s);
+ break;
+ case TRANSFORM_FFT:
+ ff_fft_end(s);
+ break;
+#if CONFIG_FFT_FLOAT
+ case TRANSFORM_RDFT:
+ ff_rdft_end(r);
+ break;
+ case TRANSFORM_DCT:
+ ff_dct_end(d);
+ break;
+#endif
}
- return 0;
+
+ av_free(tab);
+ av_free(tab1);
+ av_free(tab2);
+ av_free(tab_ref);
+ av_free(exptab);
+
+ return err;
}
projects / ffmpeg / blobdiff