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