3 * DCT test. (c) 2001 Fabrice Bellard.
4 * Started from sample code by Juan J. Sierralta P.
16 #include "simple_idct.h"
20 #define MAX(a, b) (((a) > (b)) ? (a) : (b))
23 /* reference fdct/idct */
24 extern void fdct(DCTELEM *block);
25 extern void idct(DCTELEM *block);
26 extern void init_fdct();
28 extern void j_rev_dct(DCTELEM *data);
29 extern void ff_mmx_idct(DCTELEM *data);
30 extern void ff_mmxext_idct(DCTELEM *data);
32 extern void odivx_idct_c (short *block);
34 #define AANSCALE_BITS 12
35 static const unsigned short aanscales[64] = {
36 /* precomputed values scaled up by 14 bits */
37 16384, 22725, 21407, 19266, 16384, 12873, 8867, 4520,
38 22725, 31521, 29692, 26722, 22725, 17855, 12299, 6270,
39 21407, 29692, 27969, 25172, 21407, 16819, 11585, 5906,
40 19266, 26722, 25172, 22654, 19266, 15137, 10426, 5315,
41 16384, 22725, 21407, 19266, 16384, 12873, 8867, 4520,
42 12873, 17855, 16819, 15137, 12873, 10114, 6967, 3552,
43 8867, 12299, 11585, 10426, 8867, 6967, 4799, 2446,
44 4520, 6270, 5906, 5315, 4520, 3552, 2446, 1247
47 uint8_t cropTbl[256 + 2 * MAX_NEG_CROP];
52 gettimeofday(&tv,NULL);
53 return (int64_t)tv.tv_sec * 1000000 + tv.tv_usec;
57 #define NB_ITS_SPEED 50000
59 static short idct_mmx_perm[64];
61 static short idct_simple_mmx_perm[64]={
62 0x00, 0x08, 0x04, 0x09, 0x01, 0x0C, 0x05, 0x0D,
63 0x10, 0x18, 0x14, 0x19, 0x11, 0x1C, 0x15, 0x1D,
64 0x20, 0x28, 0x24, 0x29, 0x21, 0x2C, 0x25, 0x2D,
65 0x12, 0x1A, 0x16, 0x1B, 0x13, 0x1E, 0x17, 0x1F,
66 0x02, 0x0A, 0x06, 0x0B, 0x03, 0x0E, 0x07, 0x0F,
67 0x30, 0x38, 0x34, 0x39, 0x31, 0x3C, 0x35, 0x3D,
68 0x22, 0x2A, 0x26, 0x2B, 0x23, 0x2E, 0x27, 0x2F,
69 0x32, 0x3A, 0x36, 0x3B, 0x33, 0x3E, 0x37, 0x3F,
72 void idct_mmx_init(void)
76 /* the mmx/mmxext idct uses a reordered input, so we patch scan tables */
77 for (i = 0; i < 64; i++) {
78 idct_mmx_perm[i] = (i & 0x38) | ((i & 6) >> 1) | ((i & 1) << 2);
79 // idct_simple_mmx_perm[i] = simple_block_permute_op(i);
83 static DCTELEM block[64] __attribute__ ((aligned (8)));
84 static DCTELEM block1[64] __attribute__ ((aligned (8)));
85 static DCTELEM block_org[64] __attribute__ ((aligned (8)));
87 void dct_error(const char *name, int is_idct,
88 void (*fdct_func)(DCTELEM *block),
89 void (*fdct_ref)(DCTELEM *block), int test)
93 int64_t err2, ti, ti1, it1;
94 int64_t sysErr[64], sysErrMax=0;
96 int blockSumErrMax=0, blockSumErr;
102 for(i=0; i<64; i++) sysErr[i]=0;
103 for(it=0;it<NB_ITS;it++) {
109 block1[i] = (random() % 512) -256;
118 int num= (random()%10)+1;
120 block1[random()%64] = (random() % 512) -256;
123 block1[0]= (random()%4096)-2048;
124 block1[63]= (block1[0]&1)^1;
128 #if 0 // simulate mismatch control
133 if((sum&1)==0) block1[63]^=1;
138 block_org[i]= block1[i];
140 if (fdct_func == ff_mmx_idct ||
141 fdct_func == j_rev_dct || fdct_func == ff_mmxext_idct) {
143 block[idct_mmx_perm[i]] = block1[i];
144 } else if(fdct_func == ff_simple_idct_mmx ) {
146 block[idct_simple_mmx_perm[i]] = block1[i];
152 #if 0 // simulate mismatch control for tested IDCT but not the ref
157 if((sum&1)==0) block[63]^=1;
162 emms(); /* for ff_mmx_idct */
164 if (fdct_func == fdct_ifast
165 #ifndef FAAN_POSTSCALE
166 || fdct_func == ff_faandct
169 for(i=0; i<64; i++) {
170 scale = 8*(1 << (AANSCALE_BITS + 11)) / aanscales[i];
171 block[i] = (block[i] * scale /*+ (1<<(AANSCALE_BITS-1))*/) >> AANSCALE_BITS;
179 v = abs(block[i] - block1[i]);
183 sysErr[i] += block[i] - block1[i];
185 if( abs(block[i])>maxout) maxout=abs(block[i]);
187 if(blockSumErrMax < blockSumErr) blockSumErrMax= blockSumErr;
188 #if 0 // print different matrix pairs
192 if((i&7)==0) printf("\n");
193 printf("%4d ", block_org[i]);
196 if((i&7)==0) printf("\n");
197 printf("%4d ", block[i] - block1[i]);
202 for(i=0; i<64; i++) sysErrMax= MAX(sysErrMax, ABS(sysErr[i]));
204 #if 1 // dump systematic errors
206 if(i%8==0) printf("\n");
207 printf("%5d ", (int)sysErr[i]);
212 printf("%s %s: err_inf=%d err2=%0.8f syserr=%0.8f maxout=%d blockSumErr=%d\n",
213 is_idct ? "IDCT" : "DCT",
214 name, err_inf, (double)err2 / NB_ITS / 64.0, (double)sysErrMax / NB_ITS, maxout, blockSumErrMax);
222 block1[i] = (random() % 512) -256;
232 block1[0] = (random() % 512) -256;
233 block1[1] = (random() % 512) -256;
234 block1[2] = (random() % 512) -256;
235 block1[3] = (random() % 512) -256;
239 if (fdct_func == ff_mmx_idct ||
240 fdct_func == j_rev_dct || fdct_func == ff_mmxext_idct) {
242 block[idct_mmx_perm[i]] = block1[i];
243 } else if(fdct_func == ff_simple_idct_mmx ) {
245 block[idct_simple_mmx_perm[i]] = block1[i];
254 for(it=0;it<NB_ITS_SPEED;it++) {
257 // memcpy(block, block1, sizeof(DCTELEM) * 64);
258 // dont memcpy especially not fastmemcpy because it does movntq !!!
262 ti1 = gettime() - ti;
263 } while (ti1 < 1000000);
266 printf("%s %s: %0.1f kdct/s\n",
267 is_idct ? "IDCT" : "DCT",
268 name, (double)it1 * 1000.0 / (double)ti1);
272 static uint8_t img_dest[64] __attribute__ ((aligned (8)));
273 static uint8_t img_dest1[64] __attribute__ ((aligned (8)));
275 void idct248_ref(uint8_t *dest, int linesize, int16_t *block)
278 static double c8[8][8];
279 static double c4[4][4];
280 double block1[64], block2[64], block3[64];
290 s = (i==0) ? sqrt(1.0/8.0) : sqrt(1.0/4.0);
291 c8[i][j] = s * cos(M_PI * i * (j + 0.5) / 8.0);
292 sum += c8[i][j] * c8[i][j];
299 s = (i==0) ? sqrt(1.0/4.0) : sqrt(1.0/2.0);
300 c4[i][j] = s * cos(M_PI * i * (j + 0.5) / 4.0);
301 sum += c4[i][j] * c4[i][j];
310 block1[8*(2*i)+j] = (block[8*(2*i)+j] + block[8*(2*i+1)+j]) * s;
311 block1[8*(2*i+1)+j] = (block[8*(2*i)+j] - block[8*(2*i+1)+j]) * s;
320 sum += c8[k][j] * block1[8*i+k];
331 sum += c4[k][j] * block2[8*(2*k)+i];
332 block3[8*(2*j)+i] = sum;
337 sum += c4[k][j] * block2[8*(2*k+1)+i];
338 block3[8*(2*j+1)+i] = sum;
342 /* clamp and store the result */
350 dest[i * linesize + j] = (int)rint(v);
355 void idct248_error(const char *name,
356 void (*idct248_put)(uint8_t *dest, int line_size, int16_t *block))
358 int it, i, it1, ti, ti1, err_max, v;
362 /* just one test to see if code is correct (precision is less
365 for(it=0;it<NB_ITS;it++) {
367 /* XXX: use forward transform to generate values */
369 block1[i] = (random() % 256) - 128;
374 idct248_ref(img_dest1, 8, block);
378 idct248_put(img_dest, 8, block);
381 v = abs((int)img_dest[i] - (int)img_dest1[i]);
383 printf("%d %d\n", img_dest[i], img_dest1[i]);
392 printf(" %3d", img_dest1[i*8+j]);
401 printf(" %3d", img_dest[i*8+j]);
407 printf("%s %s: err_inf=%d\n",
408 1 ? "IDCT248" : "DCT248",
414 for(it=0;it<NB_ITS_SPEED;it++) {
417 // memcpy(block, block1, sizeof(DCTELEM) * 64);
418 // dont memcpy especially not fastmemcpy because it does movntq !!!
419 idct248_put(img_dest, 8, block);
422 ti1 = gettime() - ti;
423 } while (ti1 < 1000000);
426 printf("%s %s: %0.1f kdct/s\n",
427 1 ? "IDCT248" : "DCT248",
428 name, (double)it1 * 1000.0 / (double)ti1);
433 printf("dct-test [-i] [<test-number>]\n"
434 "test-number 0 -> test with random matrixes\n"
435 " 1 -> test with random sparse matrixes\n"
436 " 2 -> do 3. test from mpeg4 std\n"
437 "-i test IDCT implementations\n"
438 "-4 test IDCT248 implementations\n");
442 int main(int argc, char **argv)
444 int test_idct = 0, test_248_dct = 0;
451 for(i=0;i<256;i++) cropTbl[i + MAX_NEG_CROP] = i;
452 for(i=0;i<MAX_NEG_CROP;i++) {
454 cropTbl[i + MAX_NEG_CROP + 256] = 255;
458 c = getopt(argc, argv, "ih4");
475 if(optind <argc) test= atoi(argv[optind]);
477 printf("ffmpeg DCT/IDCT test\n");
480 idct248_error("SIMPLE-C", simple_idct248_put);
483 dct_error("REF-DBL", 0, fdct, fdct, test); /* only to verify code ! */
484 dct_error("IJG-AAN-INT", 0, fdct_ifast, fdct, test);
485 dct_error("IJG-LLM-INT", 0, ff_jpeg_fdct_islow, fdct, test);
486 dct_error("MMX", 0, ff_fdct_mmx, fdct, test);
487 dct_error("MMX2", 0, ff_fdct_mmx2, fdct, test);
488 dct_error("FAAN", 0, ff_faandct, fdct, test);
490 dct_error("REF-DBL", 1, idct, idct, test);
491 dct_error("INT", 1, j_rev_dct, idct, test);
492 dct_error("LIBMPEG2-MMX", 1, ff_mmx_idct, idct, test);
493 dct_error("LIBMPEG2-MMXEXT", 1, ff_mmxext_idct, idct, test);
494 dct_error("SIMPLE-C", 1, simple_idct, idct, test);
495 dct_error("SIMPLE-MMX", 1, ff_simple_idct_mmx, idct, test);
496 // dct_error("ODIVX-C", 1, odivx_idct_c, idct);
497 //printf(" test against odivx idct\n");
498 // dct_error("REF", 1, idct, odivx_idct_c);
499 // dct_error("INT", 1, j_rev_dct, odivx_idct_c);
500 // dct_error("MMX", 1, ff_mmx_idct, odivx_idct_c);
501 // dct_error("MMXEXT", 1, ff_mmxext_idct, odivx_idct_c);
502 // dct_error("SIMPLE-C", 1, simple_idct, odivx_idct_c);
503 // dct_error("SIMPLE-MMX", 1, ff_simple_idct_mmx, odivx_idct_c);
504 // dct_error("ODIVX-C", 1, odivx_idct_c, odivx_idct_c);