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/* DCT test. (c) 2001 Gerard Lantau.
Started from sample code by Juan J. Sierralta P.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/time.h>
#include <unistd.h>
#include "dsputil.h"
extern void fdct(DCTELEM *block);
extern void init_fdct();
#define AANSCALE_BITS 12
static const unsigned short aanscales[64] = {
/* precomputed values scaled up by 14 bits */
16384, 22725, 21407, 19266, 16384, 12873, 8867, 4520,
22725, 31521, 29692, 26722, 22725, 17855, 12299, 6270,
21407, 29692, 27969, 25172, 21407, 16819, 11585, 5906,
19266, 26722, 25172, 22654, 19266, 15137, 10426, 5315,
16384, 22725, 21407, 19266, 16384, 12873, 8867, 4520,
12873, 17855, 16819, 15137, 12873, 10114, 6967, 3552,
8867, 12299, 11585, 10426, 8867, 6967, 4799, 2446,
4520, 6270, 5906, 5315, 4520, 3552, 2446, 1247
};
INT64 gettime(void)
{
struct timeval tv;
gettimeofday(&tv,NULL);
return (INT64)tv.tv_sec * 1000000 + tv.tv_usec;
}
#define NB_ITS 20000
#define NB_ITS_SPEED 50000
void dct_error(const char *name,
void (*fdct_func)(DCTELEM *block))
{
int it, i, scale;
DCTELEM block[64], block1[64];
int err_inf, v;
INT64 err2, ti, ti1, it1;
srandom(0);
err_inf = 0;
err2 = 0;
for(it=0;it<NB_ITS;it++) {
for(i=0;i<64;i++)
block1[i] = random() % 256;
memcpy(block, block1, sizeof(DCTELEM) * 64);
fdct_func(block);
if (fdct_func == jpeg_fdct_ifast) {
for(i=0; i<64; i++) {
scale = (1 << (AANSCALE_BITS + 11)) / aanscales[i];
block[i] = (block[i] * scale) >> AANSCALE_BITS;
}
}
fdct(block1);
for(i=0;i<64;i++) {
v = abs(block[i] - block1[i]);
if (v > err_inf)
err_inf = v;
err2 += v * v;
}
}
printf("DCT %s: err_inf=%d err2=%0.2f\n",
name, err_inf, (double)err2 / NB_ITS / 64.0);
/* speed test */
for(i=0;i<64;i++)
block1[i] = 255 - 63 + i;
ti = gettime();
it1 = 0;
do {
for(it=0;it<NB_ITS_SPEED;it++) {
memcpy(block, block1, sizeof(DCTELEM) * 64);
fdct_func(block);
}
it1 += NB_ITS_SPEED;
ti1 = gettime() - ti;
} while (ti1 < 1000000);
printf("DCT %s: %0.1f kdct/s\n",
name, (double)it1 * 1000.0 / (double)ti1);
}
int main(int argc, char **argv)
{
init_fdct();
printf("ffmpeg DCT test\n");
dct_error("REF", fdct); /* only to verify code ! */
dct_error("AAN", jpeg_fdct_ifast);
dct_error("MMX", fdct_mmx);
return 0;
}
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