3 * DCT test. (c) 2001 Fabrice Bellard.
4 * Started from sample code by Juan J. Sierralta P.
16 #include "simple_idct.h"
19 #define MAX(a, b) (((a) > (b)) ? (a) : (b))
22 /* reference fdct/idct */
23 extern void fdct(DCTELEM *block);
24 extern void idct(DCTELEM *block);
25 extern void init_fdct();
27 extern void j_rev_dct(DCTELEM *data);
28 extern void ff_mmx_idct(DCTELEM *data);
29 extern void ff_mmxext_idct(DCTELEM *data);
31 extern void odivx_idct_c (short *block);
33 #define AANSCALE_BITS 12
34 static const unsigned short aanscales[64] = {
35 /* precomputed values scaled up by 14 bits */
36 16384, 22725, 21407, 19266, 16384, 12873, 8867, 4520,
37 22725, 31521, 29692, 26722, 22725, 17855, 12299, 6270,
38 21407, 29692, 27969, 25172, 21407, 16819, 11585, 5906,
39 19266, 26722, 25172, 22654, 19266, 15137, 10426, 5315,
40 16384, 22725, 21407, 19266, 16384, 12873, 8867, 4520,
41 12873, 17855, 16819, 15137, 12873, 10114, 6967, 3552,
42 8867, 12299, 11585, 10426, 8867, 6967, 4799, 2446,
43 4520, 6270, 5906, 5315, 4520, 3552, 2446, 1247
46 uint8_t cropTbl[256 + 2 * MAX_NEG_CROP];
51 gettimeofday(&tv,NULL);
52 return (int64_t)tv.tv_sec * 1000000 + tv.tv_usec;
56 #define NB_ITS_SPEED 50000
58 static short idct_mmx_perm[64];
60 static short idct_simple_mmx_perm[64]={
61 0x00, 0x08, 0x04, 0x09, 0x01, 0x0C, 0x05, 0x0D,
62 0x10, 0x18, 0x14, 0x19, 0x11, 0x1C, 0x15, 0x1D,
63 0x20, 0x28, 0x24, 0x29, 0x21, 0x2C, 0x25, 0x2D,
64 0x12, 0x1A, 0x16, 0x1B, 0x13, 0x1E, 0x17, 0x1F,
65 0x02, 0x0A, 0x06, 0x0B, 0x03, 0x0E, 0x07, 0x0F,
66 0x30, 0x38, 0x34, 0x39, 0x31, 0x3C, 0x35, 0x3D,
67 0x22, 0x2A, 0x26, 0x2B, 0x23, 0x2E, 0x27, 0x2F,
68 0x32, 0x3A, 0x36, 0x3B, 0x33, 0x3E, 0x37, 0x3F,
71 void idct_mmx_init(void)
75 /* the mmx/mmxext idct uses a reordered input, so we patch scan tables */
76 for (i = 0; i < 64; i++) {
77 idct_mmx_perm[i] = (i & 0x38) | ((i & 6) >> 1) | ((i & 1) << 2);
78 // idct_simple_mmx_perm[i] = simple_block_permute_op(i);
82 static DCTELEM block[64] __attribute__ ((aligned (8)));
83 static DCTELEM block1[64] __attribute__ ((aligned (8)));
84 static DCTELEM block_org[64] __attribute__ ((aligned (8)));
86 void dct_error(const char *name, int is_idct,
87 void (*fdct_func)(DCTELEM *block),
88 void (*fdct_ref)(DCTELEM *block), int test)
92 int64_t err2, ti, ti1, it1;
93 int64_t sysErr[64], sysErrMax=0;
95 int blockSumErrMax=0, blockSumErr;
101 for(i=0; i<64; i++) sysErr[i]=0;
102 for(it=0;it<NB_ITS;it++) {
108 block1[i] = (random() % 512) -256;
117 int num= (random()%10)+1;
119 block1[random()%64] = (random() % 512) -256;
122 block1[0]= (random()%4096)-2048;
123 block1[63]= (block1[0]&1)^1;
127 #if 0 // simulate mismatch control
132 if((sum&1)==0) block1[63]^=1;
137 block_org[i]= block1[i];
139 if (fdct_func == ff_mmx_idct ||
140 fdct_func == j_rev_dct || fdct_func == ff_mmxext_idct) {
142 block[idct_mmx_perm[i]] = block1[i];
143 } else if(fdct_func == ff_simple_idct_mmx ) {
145 block[idct_simple_mmx_perm[i]] = block1[i];
151 #if 0 // simulate mismatch control for tested IDCT but not the ref
156 if((sum&1)==0) block[63]^=1;
161 emms(); /* for ff_mmx_idct */
163 if (fdct_func == fdct_ifast) {
164 for(i=0; i<64; i++) {
165 scale = 8*(1 << (AANSCALE_BITS + 11)) / aanscales[i];
166 block[i] = (block[i] * scale /*+ (1<<(AANSCALE_BITS-1))*/) >> AANSCALE_BITS;
174 v = abs(block[i] - block1[i]);
178 sysErr[i] += block[i] - block1[i];
180 if( abs(block[i])>maxout) maxout=abs(block[i]);
182 if(blockSumErrMax < blockSumErr) blockSumErrMax= blockSumErr;
183 #if 0 // print different matrix pairs
187 if((i&7)==0) printf("\n");
188 printf("%4d ", block_org[i]);
191 if((i&7)==0) printf("\n");
192 printf("%4d ", block[i] - block1[i]);
197 for(i=0; i<64; i++) sysErrMax= MAX(sysErrMax, ABS(sysErr[i]));
199 #if 1 // dump systematic errors
201 if(i%8==0) printf("\n");
202 printf("%5d ", (int)sysErr[i]);
207 printf("%s %s: err_inf=%d err2=%0.8f syserr=%0.8f maxout=%d blockSumErr=%d\n",
208 is_idct ? "IDCT" : "DCT",
209 name, err_inf, (double)err2 / NB_ITS / 64.0, (double)sysErrMax / NB_ITS, maxout, blockSumErrMax);
217 block1[i] = (random() % 512) -256;
227 block1[0] = (random() % 512) -256;
228 block1[1] = (random() % 512) -256;
229 block1[2] = (random() % 512) -256;
230 block1[3] = (random() % 512) -256;
234 if (fdct_func == ff_mmx_idct ||
235 fdct_func == j_rev_dct || fdct_func == ff_mmxext_idct) {
237 block[idct_mmx_perm[i]] = block1[i];
238 } else if(fdct_func == ff_simple_idct_mmx ) {
240 block[idct_simple_mmx_perm[i]] = block1[i];
249 for(it=0;it<NB_ITS_SPEED;it++) {
252 // memcpy(block, block1, sizeof(DCTELEM) * 64);
253 // dont memcpy especially not fastmemcpy because it does movntq !!!
257 ti1 = gettime() - ti;
258 } while (ti1 < 1000000);
261 printf("%s %s: %0.1f kdct/s\n",
262 is_idct ? "IDCT" : "DCT",
263 name, (double)it1 * 1000.0 / (double)ti1);
267 static uint8_t img_dest[64] __attribute__ ((aligned (8)));
268 static uint8_t img_dest1[64] __attribute__ ((aligned (8)));
270 void idct248_ref(uint8_t *dest, int linesize, int16_t *block)
273 static double c8[8][8];
274 static double c4[4][4];
275 double block1[64], block2[64], block3[64];
285 s = (i==0) ? sqrt(1.0/8.0) : sqrt(1.0/4.0);
286 c8[i][j] = s * cos(M_PI * i * (j + 0.5) / 8.0);
287 sum += c8[i][j] * c8[i][j];
294 s = (i==0) ? sqrt(1.0/4.0) : sqrt(1.0/2.0);
295 c4[i][j] = s * cos(M_PI * i * (j + 0.5) / 4.0);
296 sum += c4[i][j] * c4[i][j];
305 block1[8*(2*i)+j] = (block[8*(2*i)+j] + block[8*(2*i+1)+j]) * s;
306 block1[8*(2*i+1)+j] = (block[8*(2*i)+j] - block[8*(2*i+1)+j]) * s;
315 sum += c8[k][j] * block1[8*i+k];
326 sum += c4[k][j] * block2[8*(2*k)+i];
327 block3[8*(2*j)+i] = sum;
332 sum += c4[k][j] * block2[8*(2*k+1)+i];
333 block3[8*(2*j+1)+i] = sum;
337 /* clamp and store the result */
345 dest[i * linesize + j] = (int)rint(v);
350 void idct248_error(const char *name,
351 void (*idct248_put)(uint8_t *dest, int line_size, int16_t *block))
353 int it, i, it1, ti, ti1, err_max, v;
357 /* just one test to see if code is correct (precision is less
360 for(it=0;it<NB_ITS;it++) {
362 /* XXX: use forward transform to generate values */
364 block1[i] = (random() % 256) - 128;
369 idct248_ref(img_dest1, 8, block);
373 idct248_put(img_dest, 8, block);
376 v = abs((int)img_dest[i] - (int)img_dest1[i]);
378 printf("%d %d\n", img_dest[i], img_dest1[i]);
387 printf(" %3d", img_dest1[i*8+j]);
396 printf(" %3d", img_dest[i*8+j]);
402 printf("%s %s: err_inf=%d\n",
403 1 ? "IDCT248" : "DCT248",
409 for(it=0;it<NB_ITS_SPEED;it++) {
412 // memcpy(block, block1, sizeof(DCTELEM) * 64);
413 // dont memcpy especially not fastmemcpy because it does movntq !!!
414 idct248_put(img_dest, 8, block);
417 ti1 = gettime() - ti;
418 } while (ti1 < 1000000);
421 printf("%s %s: %0.1f kdct/s\n",
422 1 ? "IDCT248" : "DCT248",
423 name, (double)it1 * 1000.0 / (double)ti1);
428 printf("dct-test [-i] [<test-number>]\n"
429 "test-number 0 -> test with random matrixes\n"
430 " 1 -> test with random sparse matrixes\n"
431 " 2 -> do 3. test from mpeg4 std\n"
432 "-i test IDCT implementations\n"
433 "-4 test IDCT248 implementations\n");
437 int main(int argc, char **argv)
439 int test_idct = 0, test_248_dct = 0;
446 for(i=0;i<256;i++) cropTbl[i + MAX_NEG_CROP] = i;
447 for(i=0;i<MAX_NEG_CROP;i++) {
449 cropTbl[i + MAX_NEG_CROP + 256] = 255;
453 c = getopt(argc, argv, "ih4");
470 if(optind <argc) test= atoi(argv[optind]);
472 printf("ffmpeg DCT/IDCT test\n");
475 idct248_error("SIMPLE-C", simple_idct248_put);
478 dct_error("REF-DBL", 0, fdct, fdct, test); /* only to verify code ! */
479 dct_error("IJG-AAN-INT", 0, fdct_ifast, fdct, test);
480 dct_error("IJG-LLM-INT", 0, ff_jpeg_fdct_islow, fdct, test);
481 dct_error("MMX", 0, ff_fdct_mmx, fdct, test);
483 dct_error("REF-DBL", 1, idct, idct, test);
484 dct_error("INT", 1, j_rev_dct, idct, test);
485 dct_error("LIBMPEG2-MMX", 1, ff_mmx_idct, idct, test);
486 dct_error("LIBMPEG2-MMXEXT", 1, ff_mmxext_idct, idct, test);
487 dct_error("SIMPLE-C", 1, simple_idct, idct, test);
488 dct_error("SIMPLE-MMX", 1, ff_simple_idct_mmx, idct, test);
489 // dct_error("ODIVX-C", 1, odivx_idct_c, idct);
490 //printf(" test against odivx idct\n");
491 // dct_error("REF", 1, idct, odivx_idct_c);
492 // dct_error("INT", 1, j_rev_dct, odivx_idct_c);
493 // dct_error("MMX", 1, ff_mmx_idct, odivx_idct_c);
494 // dct_error("MMXEXT", 1, ff_mmxext_idct, odivx_idct_c);
495 // dct_error("SIMPLE-C", 1, simple_idct, odivx_idct_c);
496 // dct_error("SIMPLE-MMX", 1, ff_simple_idct_mmx, odivx_idct_c);
497 // dct_error("ODIVX-C", 1, odivx_idct_c, odivx_idct_c);