diff options
Diffstat (limited to 'libavcodec/dct-test.c')
-rw-r--r-- | libavcodec/dct-test.c | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/libavcodec/dct-test.c b/libavcodec/dct-test.c new file mode 100644 index 0000000..1da23a1 --- /dev/null +++ b/libavcodec/dct-test.c @@ -0,0 +1,105 @@ +/* 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; +} + |