mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-09-12 02:14:56 +02:00
295 lines
6.6 KiB
C
295 lines
6.6 KiB
C
/* FFT and MDCT tests */
|
|
#include "dsputil.h"
|
|
#include <math.h>
|
|
#include <getopt.h>
|
|
#include <sys/time.h>
|
|
|
|
int mm_flags;
|
|
|
|
void *av_malloc(int size)
|
|
{
|
|
void *ptr;
|
|
ptr = malloc(size);
|
|
return ptr;
|
|
}
|
|
|
|
void av_free(void *ptr)
|
|
{
|
|
/* XXX: this test should not be needed on most libcs */
|
|
if (ptr)
|
|
free(ptr);
|
|
}
|
|
|
|
/* cannot call it directly because of 'void **' casting is not automatic */
|
|
void __av_freep(void **ptr)
|
|
{
|
|
av_free(*ptr);
|
|
*ptr = NULL;
|
|
}
|
|
|
|
/* reference fft */
|
|
|
|
#define MUL16(a,b) ((a) * (b))
|
|
|
|
#define CMAC(pre, pim, are, aim, bre, bim) \
|
|
{\
|
|
pre += (MUL16(are, bre) - MUL16(aim, bim));\
|
|
pim += (MUL16(are, bim) + MUL16(bre, aim));\
|
|
}
|
|
|
|
FFTComplex *exptab;
|
|
|
|
void fft_ref_init(int nbits, int inverse)
|
|
{
|
|
int n, i;
|
|
float c1, s1, alpha;
|
|
|
|
n = 1 << nbits;
|
|
exptab = av_malloc((n / 2) * sizeof(FFTComplex));
|
|
|
|
for(i=0;i<(n/2);i++) {
|
|
alpha = 2 * M_PI * (float)i / (float)n;
|
|
c1 = cos(alpha);
|
|
s1 = sin(alpha);
|
|
if (!inverse)
|
|
s1 = -s1;
|
|
exptab[i].re = c1;
|
|
exptab[i].im = s1;
|
|
}
|
|
}
|
|
|
|
void fft_ref(FFTComplex *tabr, FFTComplex *tab, int nbits)
|
|
{
|
|
int n, i, j, k, n2;
|
|
float tmp_re, tmp_im, s, c;
|
|
FFTComplex *q;
|
|
|
|
n = 1 << nbits;
|
|
n2 = n >> 1;
|
|
for(i=0;i<n;i++) {
|
|
tmp_re = 0;
|
|
tmp_im = 0;
|
|
q = tab;
|
|
for(j=0;j<n;j++) {
|
|
k = (i * j) & (n - 1);
|
|
if (k >= n2) {
|
|
c = -exptab[k - n2].re;
|
|
s = -exptab[k - n2].im;
|
|
} else {
|
|
c = exptab[k].re;
|
|
s = exptab[k].im;
|
|
}
|
|
CMAC(tmp_re, tmp_im, c, s, q->re, q->im);
|
|
q++;
|
|
}
|
|
tabr[i].re = tmp_re;
|
|
tabr[i].im = tmp_im;
|
|
}
|
|
}
|
|
|
|
void imdct_ref(float *out, float *in, int n)
|
|
{
|
|
int k, i, a;
|
|
float sum, f;
|
|
|
|
for(i=0;i<n;i++) {
|
|
sum = 0;
|
|
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;
|
|
}
|
|
}
|
|
|
|
/* NOTE: no normalisation by 1 / N is done */
|
|
void mdct_ref(float *output, float *input, int n)
|
|
{
|
|
int k, i;
|
|
float a, s;
|
|
|
|
/* do it by hand */
|
|
for(k=0;k<n/2;k++) {
|
|
s = 0;
|
|
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;
|
|
}
|
|
}
|
|
|
|
|
|
float frandom(void)
|
|
{
|
|
return (float)((random() & 0xffff) - 32768) / 32768.0;
|
|
}
|
|
|
|
INT64 gettime(void)
|
|
{
|
|
struct timeval tv;
|
|
gettimeofday(&tv,NULL);
|
|
return (INT64)tv.tv_sec * 1000000 + tv.tv_usec;
|
|
}
|
|
|
|
void check_diff(float *tab1, float *tab2, int n)
|
|
{
|
|
int i;
|
|
|
|
for(i=0;i<n;i++) {
|
|
if (fabsf(tab1[i] - tab2[i]) >= 1e-3) {
|
|
printf("ERROR %d: %f %f\n",
|
|
i, tab1[i], tab2[i]);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
void help(void)
|
|
{
|
|
printf("usage: fft-test [-h] [-s] [-i] [-n b]\n"
|
|
"-h print this help\n"
|
|
"-s speed test\n"
|
|
"-m (I)MDCT test\n"
|
|
"-i inverse transform test\n"
|
|
"-n b set the transform size to 2^b\n"
|
|
);
|
|
exit(1);
|
|
}
|
|
|
|
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
FFTComplex *tab, *tab1, *tab_ref;
|
|
FFTSample *tabtmp, *tab2;
|
|
int it, i, c;
|
|
int do_speed = 0;
|
|
int do_mdct = 0;
|
|
int do_inverse = 0;
|
|
FFTContext s1, *s = &s1;
|
|
MDCTContext m1, *m = &m1;
|
|
int fft_nbits, fft_size;
|
|
|
|
mm_flags = 0;
|
|
fft_nbits = 9;
|
|
for(;;) {
|
|
c = getopt(argc, argv, "hsimn:");
|
|
if (c == -1)
|
|
break;
|
|
switch(c) {
|
|
case 'h':
|
|
help();
|
|
break;
|
|
case 's':
|
|
do_speed = 1;
|
|
break;
|
|
case 'i':
|
|
do_inverse = 1;
|
|
break;
|
|
case 'm':
|
|
do_mdct = 1;
|
|
break;
|
|
case 'n':
|
|
fft_nbits = atoi(optarg);
|
|
break;
|
|
}
|
|
}
|
|
|
|
fft_size = 1 << fft_nbits;
|
|
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) {
|
|
if (do_inverse)
|
|
printf("IMDCT");
|
|
else
|
|
printf("MDCT");
|
|
mdct_init(m, fft_nbits, do_inverse);
|
|
} else {
|
|
if (do_inverse)
|
|
printf("IFFT");
|
|
else
|
|
printf("FFT");
|
|
fft_init(s, fft_nbits, do_inverse);
|
|
fft_ref_init(fft_nbits, do_inverse);
|
|
}
|
|
printf(" %d test\n", fft_size);
|
|
|
|
/* generate random data */
|
|
|
|
for(i=0;i<fft_size;i++) {
|
|
tab1[i].re = frandom();
|
|
tab1[i].im = frandom();
|
|
}
|
|
|
|
/* checking result */
|
|
printf("Checking...\n");
|
|
|
|
if (do_mdct) {
|
|
if (do_inverse) {
|
|
imdct_ref((float *)tab_ref, (float *)tab1, fft_size);
|
|
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_calc(m, tab2, (float *)tab1, tabtmp);
|
|
|
|
check_diff((float *)tab_ref, tab2, fft_size / 2);
|
|
}
|
|
} else {
|
|
memcpy(tab, tab1, fft_size * sizeof(FFTComplex));
|
|
fft_permute(s, tab);
|
|
fft_calc(s, tab);
|
|
|
|
fft_ref(tab_ref, tab1, fft_nbits);
|
|
check_diff((float *)tab_ref, (float *)tab, fft_size * 2);
|
|
}
|
|
|
|
/* do a speed test */
|
|
|
|
if (do_speed) {
|
|
INT64 time_start, duration;
|
|
int nb_its;
|
|
|
|
printf("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) {
|
|
if (do_inverse) {
|
|
imdct_calc(m, (float *)tab, (float *)tab1, tabtmp);
|
|
} else {
|
|
mdct_calc(m, (float *)tab, (float *)tab1, tabtmp);
|
|
}
|
|
} else {
|
|
memcpy(tab, tab1, fft_size * sizeof(FFTComplex));
|
|
fft_calc(s, tab);
|
|
}
|
|
}
|
|
duration = 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,
|
|
(double)duration / 1000000.0,
|
|
nb_its);
|
|
}
|
|
|
|
if (do_mdct) {
|
|
mdct_end(m);
|
|
} else {
|
|
fft_end(s);
|
|
}
|
|
return 0;
|
|
}
|