*/
/**
- * @file fft-test.c
+ * @file libavcodec/fft-test.c
* FFT and MDCT tests.
*/
+#include "libavutil/lfg.h"
#include "dsputil.h"
#include <math.h>
#include <unistd.h>
#include <string.h>
#undef exit
-#undef random
-
-int mm_flags;
/* reference fft */
FFTComplex *exptab;
-void fft_ref_init(int nbits, int inverse)
+static void fft_ref_init(int nbits, int inverse)
{
int n, i;
double c1, s1, alpha;
n = 1 << nbits;
exptab = av_malloc((n / 2) * sizeof(FFTComplex));
- 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;
double tmp_re, tmp_im, s, c;
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;
}
}
-void imdct_ref(float *out, float *in, int nbits)
+static void imdct_ref(float *out, float *in, int nbits)
{
int n = 1<<nbits;
int k, i, a;
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];
}
/* NOTE: no normalisation by 1 / N is done */
-void mdct_ref(float *output, float *input, int nbits)
+static void mdct_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/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);
}
}
}
+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;
+ }
+}
+
-float frandom(void)
+static float frandom(AVLFG *prng)
{
- return (float)((random() & 0xffff) - 32768) / 32768.0;
+ return (int16_t)av_lfg_get(prng) / 32768.0;
}
-int64_t gettime(void)
+static int64_t gettime(void)
{
struct timeval tv;
gettimeofday(&tv,NULL);
return (int64_t)tv.tv_sec * 1000000 + tv.tv_usec;
}
-void check_diff(float *tab1, float *tab2, int n)
+static void check_diff(float *tab1, float *tab2, int n, double scale)
{
int i;
double max= 0;
double error= 0;
- for(i=0;i<n;i++) {
- double e= fabsf(tab1[i] - tab2[i]);
+ 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",
i, tab1[i], tab2[i]);
}
-void help(void)
+static void help(void)
{
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"
"-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,
+};
int main(int argc, char **argv)
{
FFTComplex *tab, *tab1, *tab_ref;
- FFTSample *tabtmp, *tab2;
+ FFTSample *tab2;
int it, i, c;
int do_speed = 0;
- int do_mdct = 0;
+ enum tf_transform transform = TRANSFORM_FFT;
int do_inverse = 0;
FFTContext s1, *s = &s1;
- MDCTContext m1, *m = &m1;
- int fft_nbits, fft_size;
+ FFTContext m1, *m = &m1;
+ 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);
- mm_flags = 0;
fft_nbits = 9;
for(;;) {
- c = getopt(argc, argv, "hsimn:");
+ c = getopt(argc, argv, "hsimrdn:f:");
if (c == -1)
break;
switch(c) {
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;
}
}
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));
- 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);
- } else {
+ ff_mdct_init(m, fft_nbits, do_inverse, scale);
+ break;
+ case TRANSFORM_FFT:
if (do_inverse)
av_log(NULL, AV_LOG_INFO,"IFFT");
else
av_log(NULL, AV_LOG_INFO,"FFT");
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,"IRDFT");
+ else
+ av_log(NULL, AV_LOG_INFO,"RDFT");
+ ff_rdft_init(r, fft_nbits, do_inverse ? IRDFT : RDFT);
+ fft_ref_init(fft_nbits, do_inverse);
+ break;
+ case TRANSFORM_DCT:
+ if (do_inverse)
+ av_log(NULL, AV_LOG_INFO,"IDCT");
+ else
+ av_log(NULL, AV_LOG_INFO,"DCT");
+ ff_dct_init(d, fft_nbits, do_inverse);
+ break;
}
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 */
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_nbits);
- ff_imdct_calc(m, tab2, (float *)tab1, tabtmp);
- check_diff((float *)tab_ref, tab2, fft_size);
+ ff_imdct_calc(m, tab2, (float *)tab1);
+ 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, tabtmp);
+ ff_mdct_calc(m, tab2, (float *)tab1);
- check_diff((float *)tab_ref, tab2, fft_size / 2);
+ check_diff((float *)tab_ref, tab2, fft_size / 2, scale);
}
- } else {
+ break;
+ case TRANSFORM_FFT:
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);
+ 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;
+ }
+ 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;
+ 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);
+ }
+ check_diff((float *)tab_ref, (float *)tab, fft_size, 1.0);
+ break;
}
/* do a speed test */
nb_its = 1;
for(;;) {
time_start = gettime();
- for(it=0;it<nb_its;it++) {
- if (do_mdct) {
+ for (it = 0; it < nb_its; it++) {
+ switch (transform) {
+ case TRANSFORM_MDCT:
if (do_inverse) {
- ff_imdct_calc(m, (float *)tab, (float *)tab1, tabtmp);
+ ff_imdct_calc(m, (float *)tab, (float *)tab1);
} else {
- ff_mdct_calc(m, (float *)tab, (float *)tab1, tabtmp);
+ ff_mdct_calc(m, (float *)tab, (float *)tab1);
}
- } else {
+ break;
+ case TRANSFORM_FFT:
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;
nb_its);
}
- if (do_mdct) {
+ switch (transform) {
+ case TRANSFORM_MDCT:
ff_mdct_end(m);
- } else {
+ break;
+ 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;
}