*/
/**
- * @file libavcodec/fft-test.c
+ * @file
* FFT and MDCT tests.
*/
+#include "libavutil/mathematics.h"
#include "libavutil/lfg.h"
-#include "dsputil.h"
+#include "libavutil/log.h"
+#include "fft.h"
#include <math.h>
#include <unistd.h>
#include <sys/time.h>
}
}
+static void idct_ref(float *output, float *input, int nbits)
+{
+ int n = 1<<nbits;
+ int k, i;
+ double a, s;
+
+ /* 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)
+{
+ 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;
+ }
+}
+
static float frandom(AVLFG *prng)
{
return (int64_t)tv.tv_sec * 1000000 + tv.tv_usec;
}
-static void check_diff(float *tab1, float *tab2, int n, double scale)
+static int check_diff(float *tab1, float *tab2, int n, double scale)
{
int i;
double max= 0;
double error= 0;
+ int err = 0;
for (i = 0; i < n; i++) {
double e= fabsf(tab1[i] - (tab2[i] / scale));
if (e >= 1e-3) {
- av_log(NULL, AV_LOG_ERROR, "ERROR %d: %f %f\n",
+ av_log(NULL, AV_LOG_ERROR, "ERROR %5d: %10.6f %10.6f\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;
}
"-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"
enum tf_transform {
TRANSFORM_FFT,
TRANSFORM_MDCT,
+ TRANSFORM_RDFT,
+ TRANSFORM_DCT,
};
int main(int argc, char **argv)
FFTSample *tab2;
int it, i, c;
int do_speed = 0;
+ int err = 1;
enum tf_transform transform = TRANSFORM_FFT;
int do_inverse = 0;
FFTContext s1, *s = &s1;
FFTContext m1, *m = &m1;
- int fft_nbits, fft_size;
+ RDFTContext r1, *r = &r1;
+ DCTContext d1, *d = &d1;
+ int fft_nbits, fft_size, fft_size_2;
double scale = 1.0;
AVLFG prng;
av_lfg_init(&prng, 1);
fft_nbits = 9;
for(;;) {
- c = getopt(argc, argv, "hsimn:f:");
+ c = getopt(argc, argv, "hsimrdn:f:");
if (c == -1)
break;
switch(c) {
case 'm':
transform = TRANSFORM_MDCT;
break;
+ case 'r':
+ transform = TRANSFORM_RDFT;
+ break;
+ case 'd':
+ transform = TRANSFORM_DCT;
+ break;
case 'n':
fft_nbits = atoi(optarg);
break;
}
fft_size = 1 << fft_nbits;
+ fft_size_2 = fft_size >> 1;
tab = av_malloc(fft_size * sizeof(FFTComplex));
tab1 = av_malloc(fft_size * sizeof(FFTComplex));
tab_ref = av_malloc(fft_size * sizeof(FFTComplex));
ff_fft_init(s, fft_nbits, do_inverse);
fft_ref_init(fft_nbits, do_inverse);
break;
+ case TRANSFORM_RDFT:
+ if (do_inverse)
+ av_log(NULL, AV_LOG_INFO,"IDFT_C2R");
+ else
+ 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;
}
av_log(NULL, AV_LOG_INFO," %d test\n", fft_size);
if (do_inverse) {
imdct_ref((float *)tab_ref, (float *)tab1, fft_nbits);
ff_imdct_calc(m, tab2, (float *)tab1);
- check_diff((float *)tab_ref, tab2, fft_size, scale);
+ err = check_diff((float *)tab_ref, tab2, fft_size, scale);
} else {
mdct_ref((float *)tab_ref, (float *)tab1, fft_nbits);
ff_mdct_calc(m, tab2, (float *)tab1);
- check_diff((float *)tab_ref, tab2, fft_size / 2, scale);
+ err = check_diff((float *)tab_ref, tab2, fft_size / 2, scale);
}
break;
case TRANSFORM_FFT:
ff_fft_calc(s, tab);
fft_ref(tab_ref, tab1, fft_nbits);
- check_diff((float *)tab_ref, (float *)tab, fft_size * 2, 1.0);
+ err = check_diff((float *)tab_ref, (float *)tab, fft_size * 2, 1.0);
+ break;
+ case TRANSFORM_RDFT:
+ 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;
+
+ ff_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;
+ }
+ ff_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));
+ ff_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;
}
memcpy(tab, tab1, fft_size * sizeof(FFTComplex));
ff_fft_calc(s, tab);
break;
+ case TRANSFORM_RDFT:
+ memcpy(tab2, tab1, fft_size * sizeof(FFTSample));
+ ff_rdft_calc(r, tab2);
+ break;
+ case TRANSFORM_DCT:
+ memcpy(tab2, tab1, fft_size * sizeof(FFTSample));
+ ff_dct_calc(d, tab2);
+ break;
}
}
duration = gettime() - time_start;
case TRANSFORM_FFT:
ff_fft_end(s);
break;
+ case TRANSFORM_RDFT:
+ ff_rdft_end(r);
+ break;
+ case TRANSFORM_DCT:
+ ff_dct_end(d);
+ break;
}
- return 0;
+
+ av_free(tab);
+ av_free(tab1);
+ av_free(tab2);
+ av_free(tab_ref);
+ av_free(exptab);
+
+ return err;
}
projects / ffmpeg / blobdiff