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FFmpeg/libavcodec/dct-test.c

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  1. /*

  2.  * (c) 2001 Fabrice Bellard

  3.  *     2007 Marc Hoffman <marc.hoffman@analog.com>

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

  7.  * FFmpeg is free software; you can redistribute it and/or

  8.  * modify it under the terms of the GNU Lesser General Public

  9.  * License as published by the Free Software Foundation; either

  10.  * version 2.1 of the License, or (at your option) any later version.

  11.  *

  12.  * FFmpeg is distributed in the hope that it will be useful,

  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  15.  * Lesser General Public License for more details.

  16.  *

  17.  * You should have received a copy of the GNU Lesser General Public

  18.  * License along with FFmpeg; if not, write to the Free Software

  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  20.  */

  21. 

  22. /**

  23.  * @file dct-test.c

  24.  * DCT test. (c) 2001 Fabrice Bellard.

  25.  * Started from sample code by Juan J. Sierralta P.

  26.  */

  27. 

  28. #include <stdlib.h>

  29. #include <stdio.h>

  30. #include <string.h>

  31. #include <sys/time.h>

  32. #include <unistd.h>

  33. #include <math.h>

  34. 

  35. #include "dsputil.h"

  36. 

  37. #include "simple_idct.h"

  38. #include "faandct.h"

  39. 

  40. #ifndef MAX

  41. #define MAX(a, b)  (((a) > (b)) ? (a) : (b))

  42. #endif

  43. 

  44. #undef printf

  45. 

  46. void *fast_memcpy(void *a, const void *b, size_t c){return memcpy(a,b,c);};

  47. 

  48. /* reference fdct/idct */

  49. extern void fdct(DCTELEM *block);

  50. extern void idct(DCTELEM *block);

  51. extern void ff_idct_xvid_mmx(DCTELEM *block);

  52. extern void ff_idct_xvid_mmx2(DCTELEM *block);

  53. extern void init_fdct();

  54. 

  55. extern void ff_mmx_idct(DCTELEM *data);

  56. extern void ff_mmxext_idct(DCTELEM *data);

  57. 

  58. extern void odivx_idct_c (short *block);

  59. 

  60. // BFIN

  61. extern void ff_bfin_idct (DCTELEM *block)  ;

  62. extern void ff_bfin_fdct (DCTELEM *block) ;

  63. 

  64. // ALTIVEC

  65. extern void fdct_altivec (DCTELEM *block);

  66. //extern void idct_altivec (DCTELEM *block);?? no routine

  67. 

  68. 

  69. struct algo {

  70.   char *name;

  71.   enum { FDCT, IDCT } is_idct;

  72.   void (* func) (DCTELEM *block);

  73.   void (* ref)  (DCTELEM *block);

  74.   enum formattag { NO_PERM,MMX_PERM, MMX_SIMPLE_PERM, SCALE_PERM } format;

  75. };

  76. 

  77. #ifndef FAAN_POSTSCALE

  78. #define FAAN_SCALE SCALE_PERM

  79. #else

  80. #define FAAN_SCALE NO_PERM

  81. #endif

  82. 

  83. #define DCT_ERROR(name,is_idct,func,ref,form) {name,is_idct,func,ref,form}

  84. 

  85. 

  86. struct algo algos[] = {

  87.   DCT_ERROR( "REF-DBL",        0, fdct,               fdct, NO_PERM),

  88.   DCT_ERROR("FAAN",            0, ff_faandct,         fdct, FAAN_SCALE),

  89.   DCT_ERROR("IJG-AAN-INT",     0, fdct_ifast,         fdct, SCALE_PERM),

  90.   DCT_ERROR("IJG-LLM-INT",     0, ff_jpeg_fdct_islow, fdct, NO_PERM),

  91.   DCT_ERROR("REF-DBL",         1, idct,               idct, NO_PERM),

  92.   DCT_ERROR("INT",             1, j_rev_dct,          idct, MMX_PERM),

  93.   DCT_ERROR("SIMPLE-C",        1, simple_idct,        idct, NO_PERM),

  94. 

  95. #ifdef HAVE_MMX

  96.   DCT_ERROR("MMX",             0, ff_fdct_mmx,        fdct, NO_PERM),

  97. #ifdef HAVE_MMX2

  98.   DCT_ERROR("MMX2",            0, ff_fdct_mmx2,       fdct, NO_PERM),

  99. #endif

  100. 

  101. #ifdef CONFIG_GPL

  102.   DCT_ERROR("LIBMPEG2-MMX",    1, ff_mmx_idct,        idct, MMX_PERM),

  103.   DCT_ERROR("LIBMPEG2-MMXEXT", 1, ff_mmxext_idct,     idct, MMX_PERM),

  104. #endif

  105.   DCT_ERROR("SIMPLE-MMX",      1, ff_simple_idct_mmx, idct, MMX_SIMPLE_PERM),

  106.   DCT_ERROR("XVID-MMX",        1, ff_idct_xvid_mmx,   idct, NO_PERM),

  107.   DCT_ERROR("XVID-MMX2",       1, ff_idct_xvid_mmx2,  idct, NO_PERM),

  108. #endif

  109. 

  110. #ifdef HAVE_ALTIVEC

  111.   DCT_ERROR("altivecfdct",     0, fdct_altivec,       fdct, NO_PERM),

  112. #endif

  113. 

  114. #ifdef ARCH_BFIN

  115.   DCT_ERROR("BFINfdct",        0, ff_bfin_fdct,       fdct, NO_PERM),

  116.   DCT_ERROR("BFINidct",        1, ff_bfin_idct,       idct, NO_PERM),

  117. #endif

  118. 

  119.   { 0 }

  120. };

  121. 

  122. #define AANSCALE_BITS 12

  123. static const unsigned short aanscales[64] = {

  124.     /* precomputed values scaled up by 14 bits */

  125.     16384, 22725, 21407, 19266, 16384, 12873,  8867,  4520,

  126.     22725, 31521, 29692, 26722, 22725, 17855, 12299,  6270,

  127.     21407, 29692, 27969, 25172, 21407, 16819, 11585,  5906,

  128.     19266, 26722, 25172, 22654, 19266, 15137, 10426,  5315,

  129.     16384, 22725, 21407, 19266, 16384, 12873,  8867,  4520,

  130.     12873, 17855, 16819, 15137, 12873, 10114,  6967,  3552,

  131.     8867, 12299, 11585, 10426,  8867,  6967,  4799,  2446,

  132.     4520,  6270,  5906,  5315,  4520,  3552,  2446,  1247

  133. };

  134. 

  135. uint8_t cropTbl[256 + 2 * MAX_NEG_CROP];

  136. 

  137. int64_t gettime(void)

  138. {

  139.     struct timeval tv;

  140.     gettimeofday(&tv,NULL);

  141.     return (int64_t)tv.tv_sec * 1000000 + tv.tv_usec;

  142. }

  143. 

  144. #define NB_ITS 20000

  145. #define NB_ITS_SPEED 50000

  146. 

  147. static short idct_mmx_perm[64];

  148. 

  149. static short idct_simple_mmx_perm[64]={

  150.         0x00, 0x08, 0x04, 0x09, 0x01, 0x0C, 0x05, 0x0D,

  151.         0x10, 0x18, 0x14, 0x19, 0x11, 0x1C, 0x15, 0x1D,

  152.         0x20, 0x28, 0x24, 0x29, 0x21, 0x2C, 0x25, 0x2D,

  153.         0x12, 0x1A, 0x16, 0x1B, 0x13, 0x1E, 0x17, 0x1F,

  154.         0x02, 0x0A, 0x06, 0x0B, 0x03, 0x0E, 0x07, 0x0F,

  155.         0x30, 0x38, 0x34, 0x39, 0x31, 0x3C, 0x35, 0x3D,

  156.         0x22, 0x2A, 0x26, 0x2B, 0x23, 0x2E, 0x27, 0x2F,

  157.         0x32, 0x3A, 0x36, 0x3B, 0x33, 0x3E, 0x37, 0x3F,

  158. };

  159. 

  160. void idct_mmx_init(void)

  161. {

  162.     int i;

  163. 

  164.     /* the mmx/mmxext idct uses a reordered input, so we patch scan tables */

  165.     for (i = 0; i < 64; i++) {

  166.         idct_mmx_perm[i] = (i & 0x38) | ((i & 6) >> 1) | ((i & 1) << 2);

  167. //        idct_simple_mmx_perm[i] = simple_block_permute_op(i);

  168.     }

  169. }

  170. 

  171. static DCTELEM block[64] __attribute__ ((aligned (8)));

  172. static DCTELEM block1[64] __attribute__ ((aligned (8)));

  173. static DCTELEM block_org[64] __attribute__ ((aligned (8)));

  174. 

  175. void dct_error(const char *name, int is_idct,

  176.                void (*fdct_func)(DCTELEM *block),

  177.                void (*fdct_ref)(DCTELEM *block), int form, int test)

  178. {

  179.     int it, i, scale;

  180.     int err_inf, v;

  181.     int64_t err2, ti, ti1, it1;

  182.     int64_t sysErr[64], sysErrMax=0;

  183.     int maxout=0;

  184.     int blockSumErrMax=0, blockSumErr;

  185. 

  186.     srandom(0);

  187. 

  188.     err_inf = 0;

  189.     err2 = 0;

  190.     for(i=0; i<64; i++) sysErr[i]=0;

  191.     for(it=0;it<NB_ITS;it++) {

  192.         for(i=0;i<64;i++)

  193.             block1[i] = 0;

  194.         switch(test){

  195.         case 0:

  196.             for(i=0;i<64;i++)

  197.                 block1[i] = (random() % 512) -256;

  198.             if (is_idct){

  199.                 fdct(block1);

  200. 

  201.                 for(i=0;i<64;i++)

  202.                     block1[i]>>=3;

  203.             }

  204.         break;

  205.         case 1:{

  206.             int num= (random()%10)+1;

  207.             for(i=0;i<num;i++)

  208.                 block1[random()%64] = (random() % 512) -256;

  209.         }break;

  210.         case 2:

  211.             block1[0]= (random()%4096)-2048;

  212.             block1[63]= (block1[0]&1)^1;

  213.         break;

  214.         }

  215. 

  216. #if 0 // simulate mismatch control

  217. { int sum=0;

  218.         for(i=0;i<64;i++)

  219.            sum+=block1[i];

  220. 

  221.         if((sum&1)==0) block1[63]^=1;

  222. }

  223. #endif

  224. 

  225.         for(i=0; i<64; i++)

  226.             block_org[i]= block1[i];

  227. 

  228.         if (form == MMX_PERM) {

  229.             for(i=0;i<64;i++)

  230.                 block[idct_mmx_perm[i]] = block1[i];

  231.             } else if (form == MMX_SIMPLE_PERM) {

  232.             for(i=0;i<64;i++)

  233.                 block[idct_simple_mmx_perm[i]] = block1[i];

  234. 

  235.         } else {

  236.             for(i=0; i<64; i++)

  237.                 block[i]= block1[i];

  238.         }

  239. #if 0 // simulate mismatch control for tested IDCT but not the ref

  240. { int sum=0;

  241.         for(i=0;i<64;i++)

  242.            sum+=block[i];

  243. 

  244.         if((sum&1)==0) block[63]^=1;

  245. }

  246. #endif

  247. 

  248.         fdct_func(block);

  249.         emms_c(); /* for ff_mmx_idct */

  250. 

  251.         if (form == SCALE_PERM) {

  252.             for(i=0; i<64; i++) {

  253.                 scale = 8*(1 << (AANSCALE_BITS + 11)) / aanscales[i];

  254.                 block[i] = (block[i] * scale /*+ (1<<(AANSCALE_BITS-1))*/) >> AANSCALE_BITS;

  255.             }

  256.         }

  257. 

  258.         fdct_ref(block1);

  259. 

  260.         blockSumErr=0;

  261.         for(i=0;i<64;i++) {

  262.             v = abs(block[i] - block1[i]);

  263.             if (v > err_inf)

  264.                 err_inf = v;

  265.             err2 += v * v;

  266.             sysErr[i] += block[i] - block1[i];

  267.             blockSumErr += v;

  268.             if( abs(block[i])>maxout) maxout=abs(block[i]);

  269.         }

  270.         if(blockSumErrMax < blockSumErr) blockSumErrMax= blockSumErr;

  271. #if 0 // print different matrix pairs

  272.         if(blockSumErr){

  273.             printf("\n");

  274.             for(i=0; i<64; i++){

  275.                 if((i&7)==0) printf("\n");

  276.                 printf("%4d ", block_org[i]);

  277.             }

  278.             for(i=0; i<64; i++){

  279.                 if((i&7)==0) printf("\n");

  280.                 printf("%4d ", block[i] - block1[i]);

  281.             }

  282.         }

  283. #endif

  284.     }

  285.     for(i=0; i<64; i++) sysErrMax= MAX(sysErrMax, FFABS(sysErr[i]));

  286. 

  287. #if 1 // dump systematic errors

  288.     for(i=0; i<64; i++){

  289.         if(i%8==0) printf("\n");

  290.         printf("%5d ", (int)sysErr[i]);

  291.     }

  292.     printf("\n");

  293. #endif

  294. 

  295.     printf("%s %s: err_inf=%d err2=%0.8f syserr=%0.8f maxout=%d blockSumErr=%d\n",

  296.            is_idct ? "IDCT" : "DCT",

  297.            name, err_inf, (double)err2 / NB_ITS / 64.0, (double)sysErrMax / NB_ITS, maxout, blockSumErrMax);

  298. #if 1 //Speed test

  299.     /* speed test */

  300.     for(i=0;i<64;i++)

  301.         block1[i] = 0;

  302.     switch(test){

  303.     case 0:

  304.         for(i=0;i<64;i++)

  305.             block1[i] = (random() % 512) -256;

  306.         if (is_idct){

  307.             fdct(block1);

  308. 

  309.             for(i=0;i<64;i++)

  310.                 block1[i]>>=3;

  311.         }

  312.     break;

  313.     case 1:{

  314.     case 2:

  315.         block1[0] = (random() % 512) -256;

  316.         block1[1] = (random() % 512) -256;

  317.         block1[2] = (random() % 512) -256;

  318.         block1[3] = (random() % 512) -256;

  319.     }break;

  320.     }

  321. 

  322.     if (form == MMX_PERM) {

  323.         for(i=0;i<64;i++)

  324.             block[idct_mmx_perm[i]] = block1[i];

  325.     } else if(form == MMX_SIMPLE_PERM) {

  326.         for(i=0;i<64;i++)

  327.             block[idct_simple_mmx_perm[i]] = block1[i];

  328.     } else {

  329.         for(i=0; i<64; i++)

  330.             block[i]= block1[i];

  331.     }

  332. 

  333.     ti = gettime();

  334.     it1 = 0;

  335.     do {

  336.         for(it=0;it<NB_ITS_SPEED;it++) {

  337.             for(i=0; i<64; i++)

  338.                 block[i]= block1[i];

  339. //            memcpy(block, block1, sizeof(DCTELEM) * 64);

  340. // do not memcpy especially not fastmemcpy because it does movntq !!!

  341.             fdct_func(block);

  342.         }

  343.         it1 += NB_ITS_SPEED;

  344.         ti1 = gettime() - ti;

  345.     } while (ti1 < 1000000);

  346.     emms_c();

  347. 

  348.     printf("%s %s: %0.1f kdct/s\n",

  349.            is_idct ? "IDCT" : "DCT",

  350.            name, (double)it1 * 1000.0 / (double)ti1);

  351. #endif

  352. }

  353. 

  354. static uint8_t img_dest[64] __attribute__ ((aligned (8)));

  355. static uint8_t img_dest1[64] __attribute__ ((aligned (8)));

  356. 

  357. void idct248_ref(uint8_t *dest, int linesize, int16_t *block)

  358. {

  359.     static int init;

  360.     static double c8[8][8];

  361.     static double c4[4][4];

  362.     double block1[64], block2[64], block3[64];

  363.     double s, sum, v;

  364.     int i, j, k;

  365. 

  366.     if (!init) {

  367.         init = 1;

  368. 

  369.         for(i=0;i<8;i++) {

  370.             sum = 0;

  371.             for(j=0;j<8;j++) {

  372.                 s = (i==0) ? sqrt(1.0/8.0) : sqrt(1.0/4.0);

  373.                 c8[i][j] = s * cos(M_PI * i * (j + 0.5) / 8.0);

  374.                 sum += c8[i][j] * c8[i][j];

  375.             }

  376.         }

  377. 

  378.         for(i=0;i<4;i++) {

  379.             sum = 0;

  380.             for(j=0;j<4;j++) {

  381.                 s = (i==0) ? sqrt(1.0/4.0) : sqrt(1.0/2.0);

  382.                 c4[i][j] = s * cos(M_PI * i * (j + 0.5) / 4.0);

  383.                 sum += c4[i][j] * c4[i][j];

  384.             }

  385.         }

  386.     }

  387. 

  388.     /* butterfly */

  389.     s = 0.5 * sqrt(2.0);

  390.     for(i=0;i<4;i++) {

  391.         for(j=0;j<8;j++) {

  392.             block1[8*(2*i)+j] = (block[8*(2*i)+j] + block[8*(2*i+1)+j]) * s;

  393.             block1[8*(2*i+1)+j] = (block[8*(2*i)+j] - block[8*(2*i+1)+j]) * s;

  394.         }

  395.     }

  396. 

  397.     /* idct8 on lines */

  398.     for(i=0;i<8;i++) {

  399.         for(j=0;j<8;j++) {

  400.             sum = 0;

  401.             for(k=0;k<8;k++)

  402.                 sum += c8[k][j] * block1[8*i+k];

  403.             block2[8*i+j] = sum;

  404.         }

  405.     }

  406. 

  407.     /* idct4 */

  408.     for(i=0;i<8;i++) {

  409.         for(j=0;j<4;j++) {

  410.             /* top */

  411.             sum = 0;

  412.             for(k=0;k<4;k++)

  413.                 sum += c4[k][j] * block2[8*(2*k)+i];

  414.             block3[8*(2*j)+i] = sum;

  415. 

  416.             /* bottom */

  417.             sum = 0;

  418.             for(k=0;k<4;k++)

  419.                 sum += c4[k][j] * block2[8*(2*k+1)+i];

  420.             block3[8*(2*j+1)+i] = sum;

  421.         }

  422.     }

  423. 

  424.     /* clamp and store the result */

  425.     for(i=0;i<8;i++) {

  426.         for(j=0;j<8;j++) {

  427.             v = block3[8*i+j];

  428.             if (v < 0)

  429.                 v = 0;

  430.             else if (v > 255)

  431.                 v = 255;

  432.             dest[i * linesize + j] = (int)rint(v);

  433.         }

  434.     }

  435. }

  436. 

  437. void idct248_error(const char *name,

  438.                     void (*idct248_put)(uint8_t *dest, int line_size, int16_t *block))

  439. {

  440.     int it, i, it1, ti, ti1, err_max, v;

  441. 

  442.     srandom(0);

  443. 

  444.     /* just one test to see if code is correct (precision is less

  445.        important here) */

  446.     err_max = 0;

  447.     for(it=0;it<NB_ITS;it++) {

  448. 

  449.         /* XXX: use forward transform to generate values */

  450.         for(i=0;i<64;i++)

  451.             block1[i] = (random() % 256) - 128;

  452.         block1[0] += 1024;

  453. 

  454.         for(i=0; i<64; i++)

  455.             block[i]= block1[i];

  456.         idct248_ref(img_dest1, 8, block);

  457. 

  458.         for(i=0; i<64; i++)

  459.             block[i]= block1[i];

  460.         idct248_put(img_dest, 8, block);

  461. 

  462.         for(i=0;i<64;i++) {

  463.             v = abs((int)img_dest[i] - (int)img_dest1[i]);

  464.             if (v == 255)

  465.                 printf("%d %d\n", img_dest[i], img_dest1[i]);

  466.             if (v > err_max)

  467.                 err_max = v;

  468.         }

  469. #if 0

  470.         printf("ref=\n");

  471.         for(i=0;i<8;i++) {

  472.             int j;

  473.             for(j=0;j<8;j++) {

  474.                 printf(" %3d", img_dest1[i*8+j]);

  475.             }

  476.             printf("\n");

  477.         }

  478. 

  479.         printf("out=\n");

  480.         for(i=0;i<8;i++) {

  481.             int j;

  482.             for(j=0;j<8;j++) {

  483.                 printf(" %3d", img_dest[i*8+j]);

  484.             }

  485.             printf("\n");

  486.         }

  487. #endif

  488.     }

  489.     printf("%s %s: err_inf=%d\n",

  490.            1 ? "IDCT248" : "DCT248",

  491.            name, err_max);

  492. 

  493.     ti = gettime();

  494.     it1 = 0;

  495.     do {

  496.         for(it=0;it<NB_ITS_SPEED;it++) {

  497.             for(i=0; i<64; i++)

  498.                 block[i]= block1[i];

  499. //            memcpy(block, block1, sizeof(DCTELEM) * 64);

  500. // do not memcpy especially not fastmemcpy because it does movntq !!!

  501.             idct248_put(img_dest, 8, block);

  502.         }

  503.         it1 += NB_ITS_SPEED;

  504.         ti1 = gettime() - ti;

  505.     } while (ti1 < 1000000);

  506.     emms_c();

  507. 

  508.     printf("%s %s: %0.1f kdct/s\n",

  509.            1 ? "IDCT248" : "DCT248",

  510.            name, (double)it1 * 1000.0 / (double)ti1);

  511. }

  512. 

  513. void help(void)

  514. {

  515.     printf("dct-test [-i] [<test-number>]\n"

  516.            "test-number 0 -> test with random matrixes\n"

  517.            "            1 -> test with random sparse matrixes\n"

  518.            "            2 -> do 3. test from mpeg4 std\n"

  519.            "-i          test IDCT implementations\n"

  520.            "-4          test IDCT248 implementations\n");

  521. }

  522. 

  523. int main(int argc, char **argv)

  524. {

  525.     int test_idct = 0, test_248_dct = 0;

  526.     int c,i;

  527.     int test=1;

  528. 

  529.     init_fdct();

  530.     idct_mmx_init();

  531. 

  532.     for(i=0;i<256;i++) cropTbl[i + MAX_NEG_CROP] = i;

  533.     for(i=0;i<MAX_NEG_CROP;i++) {

  534.         cropTbl[i] = 0;

  535.         cropTbl[i + MAX_NEG_CROP + 256] = 255;

  536.     }

  537. 

  538.     for(;;) {

  539.         c = getopt(argc, argv, "ih4");

  540.         if (c == -1)

  541.             break;

  542.         switch(c) {

  543.         case 'i':

  544.             test_idct = 1;

  545.             break;

  546.         case '4':

  547.             test_248_dct = 1;

  548.             break;

  549.         default :

  550.         case 'h':

  551.             help();

  552.             return 0;

  553.         }

  554.     }

  555. 

  556.     if(optind <argc) test= atoi(argv[optind]);

  557. 

  558.     printf("ffmpeg DCT/IDCT test\n");

  559. 

  560.     if (test_248_dct) {

  561.         idct248_error("SIMPLE-C", simple_idct248_put);

  562.     } else {

  563.       for (i=0;algos[i].name;i++)

  564.         if (algos[i].is_idct == test_idct) {

  565.           dct_error (algos[i].name, algos[i].is_idct, algos[i].func, algos[i].ref, algos[i].format, test);

  566.         }

  567.     }

  568.     return 0;

  569. }