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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

  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 "libavutil/cpu.h"

  36. #include "libavutil/common.h"

  37. #include "libavutil/lfg.h"

  38. 

  39. #include "simple_idct.h"

  40. #include "aandcttab.h"

  41. #include "faandct.h"

  42. #include "faanidct.h"

  43. #include "x86/idct_xvid.h"

  44. #include "dctref.h"

  45. 

  46. #undef printf

  47. 

  48. void ff_mmx_idct(DCTELEM *data);

  49. void ff_mmxext_idct(DCTELEM *data);

  50. 

  51. void odivx_idct_c(short *block);

  52. 

  53. // BFIN

  54. void ff_bfin_idct(DCTELEM *block);

  55. void ff_bfin_fdct(DCTELEM *block);

  56. 

  57. // ALTIVEC

  58. void fdct_altivec(DCTELEM *block);

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

  60. 

  61. // ARM

  62. void ff_j_rev_dct_arm(DCTELEM *data);

  63. void ff_simple_idct_arm(DCTELEM *data);

  64. void ff_simple_idct_armv5te(DCTELEM *data);

  65. void ff_simple_idct_armv6(DCTELEM *data);

  66. void ff_simple_idct_neon(DCTELEM *data);

  67. 

  68. void ff_simple_idct_axp(DCTELEM *data);

  69. 

  70. struct algo {

  71.     const char *name;

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

  73.     enum formattag { NO_PERM, MMX_PERM, MMX_SIMPLE_PERM, SCALE_PERM,

  74.                      SSE2_PERM, PARTTRANS_PERM, TRANSPOSE_PERM } format;

  75.     int mm_support;

  76.     int nonspec;

  77. };

  78. 

  79. #ifndef FAAN_POSTSCALE

  80. #define FAAN_SCALE SCALE_PERM

  81. #else

  82. #define FAAN_SCALE NO_PERM

  83. #endif

  84. 

  85. static int cpu_flags;

  86. 

  87. static const struct algo fdct_tab[] = {

  88.     { "REF-DBL",        ff_ref_fdct,           NO_PERM    },

  89.     { "FAAN",           ff_faandct,            FAAN_SCALE },

  90.     { "IJG-AAN-INT",    fdct_ifast,            SCALE_PERM },

  91.     { "IJG-LLM-INT",    ff_jpeg_fdct_islow_8,  NO_PERM    },

  92. 

  93. #if HAVE_MMX

  94.     { "MMX",            ff_fdct_mmx,           NO_PERM,   AV_CPU_FLAG_MMX     },

  95.     { "MMX2",           ff_fdct_mmx2,          NO_PERM,   AV_CPU_FLAG_MMX2    },

  96.     { "SSE2",           ff_fdct_sse2,          NO_PERM,   AV_CPU_FLAG_SSE2    },

  97. #endif

  98. 

  99. #if HAVE_ALTIVEC

  100.     { "altivecfdct",    fdct_altivec,          NO_PERM,   AV_CPU_FLAG_ALTIVEC },

  101. #endif

  102. 

  103. #if ARCH_BFIN

  104.     { "BFINfdct",       ff_bfin_fdct,          NO_PERM  },

  105. #endif

  106. 

  107.     { 0 }

  108. };

  109. 

  110. #if HAVE_MMX

  111. void ff_prores_idct_put_10_sse2(uint16_t *dst, int linesize,

  112.                                 DCTELEM *block, int16_t *qmat);

  113. 

  114. static void ff_prores_idct_put_10_sse2_wrap(uint16_t *dst){

  115.     int16_t qmat[64]; int i;

  116.     int16_t tmp[64];

  117. 

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

  119.         qmat[i]=4;

  120.         tmp[i]= dst[i];

  121.     }

  122.     ff_prores_idct_put_10_sse2(dst, 16, tmp, qmat);

  123. }

  124. #endif

  125. 

  126. static const struct algo idct_tab[] = {

  127.     { "FAANI",          ff_faanidct,           NO_PERM  },

  128.     { "REF-DBL",        ff_ref_idct,           NO_PERM  },

  129.     { "INT",            j_rev_dct,             MMX_PERM },

  130.     { "SIMPLE-C",       ff_simple_idct_8,      NO_PERM  },

  131. 

  132. #if HAVE_MMX

  133. #if CONFIG_GPL

  134.     { "LIBMPEG2-MMX",   ff_mmx_idct,           MMX_PERM,  AV_CPU_FLAG_MMX,  1 },

  135.     { "LIBMPEG2-MMX2",  ff_mmxext_idct,        MMX_PERM,  AV_CPU_FLAG_MMX2, 1 },

  136. #endif

  137.     { "SIMPLE-MMX",     ff_simple_idct_mmx,  MMX_SIMPLE_PERM, AV_CPU_FLAG_MMX },

  138.     { "XVID-MMX",       ff_idct_xvid_mmx,      NO_PERM,   AV_CPU_FLAG_MMX,  1 },

  139.     { "XVID-MMX2",      ff_idct_xvid_mmx2,     NO_PERM,   AV_CPU_FLAG_MMX2, 1 },

  140.     { "XVID-SSE2",      ff_idct_xvid_sse2,     SSE2_PERM, AV_CPU_FLAG_SSE2, 1 },

  141.     { "PR-SSE2",        ff_prores_idct_put_10_sse2_wrap,     TRANSPOSE_PERM, AV_CPU_FLAG_SSE2, 1 },

  142. #endif

  143. 

  144. #if ARCH_BFIN

  145.     { "BFINidct",       ff_bfin_idct,          NO_PERM  },

  146. #endif

  147. 

  148. #if ARCH_ARM

  149.     { "SIMPLE-ARM",     ff_simple_idct_arm,    NO_PERM  },

  150.     { "INT-ARM",        ff_j_rev_dct_arm,      MMX_PERM },

  151. #endif

  152. #if HAVE_ARMV5TE

  153.     { "SIMPLE-ARMV5TE", ff_simple_idct_armv5te,NO_PERM  },

  154. #endif

  155. #if HAVE_ARMV6

  156.     { "SIMPLE-ARMV6",   ff_simple_idct_armv6,  MMX_PERM },

  157. #endif

  158. #if HAVE_NEON

  159.     { "SIMPLE-NEON",    ff_simple_idct_neon,   PARTTRANS_PERM },

  160. #endif

  161. 

  162. #if ARCH_ALPHA

  163.     { "SIMPLE-ALPHA",   ff_simple_idct_axp,    NO_PERM },

  164. #endif

  165. 

  166.     { 0 }

  167. };

  168. 

  169. #define AANSCALE_BITS 12

  170. 

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

  172. 

  173. static int64_t gettime(void)

  174. {

  175.     struct timeval tv;

  176.     gettimeofday(&tv, NULL);

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

  178. }

  179. 

  180. #define NB_ITS 20000

  181. #define NB_ITS_SPEED 50000

  182. 

  183. static short idct_mmx_perm[64];

  184. 

  185. static short idct_simple_mmx_perm[64] = {

  186.     0x00, 0x08, 0x04, 0x09, 0x01, 0x0C, 0x05, 0x0D,

  187.     0x10, 0x18, 0x14, 0x19, 0x11, 0x1C, 0x15, 0x1D,

  188.     0x20, 0x28, 0x24, 0x29, 0x21, 0x2C, 0x25, 0x2D,

  189.     0x12, 0x1A, 0x16, 0x1B, 0x13, 0x1E, 0x17, 0x1F,

  190.     0x02, 0x0A, 0x06, 0x0B, 0x03, 0x0E, 0x07, 0x0F,

  191.     0x30, 0x38, 0x34, 0x39, 0x31, 0x3C, 0x35, 0x3D,

  192.     0x22, 0x2A, 0x26, 0x2B, 0x23, 0x2E, 0x27, 0x2F,

  193.     0x32, 0x3A, 0x36, 0x3B, 0x33, 0x3E, 0x37, 0x3F,

  194. };

  195. 

  196. static const uint8_t idct_sse2_row_perm[8] = { 0, 4, 1, 5, 2, 6, 3, 7 };

  197. 

  198. static void idct_mmx_init(void)

  199. {

  200.     int i;

  201. 

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

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

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

  205.     }

  206. }

  207. 

  208. DECLARE_ALIGNED(16, static DCTELEM, block)[64];

  209. DECLARE_ALIGNED(8,  static DCTELEM, block1)[64];

  210. 

  211. static inline void mmx_emms(void)

  212. {

  213. #if HAVE_MMX

  214.     if (cpu_flags & AV_CPU_FLAG_MMX)

  215.         __asm__ volatile ("emms\n\t");

  216. #endif

  217. }

  218. 

  219. static void init_block(DCTELEM block[64], int test, int is_idct, AVLFG *prng, int vals)

  220. {

  221.     int i, j;

  222. 

  223.     memset(block, 0, 64 * sizeof(*block));

  224. 

  225.     switch (test) {

  226.     case 0:

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

  228.             block[i] = (av_lfg_get(prng) % (2*vals)) -vals;

  229.         if (is_idct) {

  230.             ff_ref_fdct(block);

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

  232.                 block[i] >>= 3;

  233.         }

  234.         break;

  235.     case 1:

  236.         j = av_lfg_get(prng) % 10 + 1;

  237.         for (i = 0; i < j; i++)

  238.             block[av_lfg_get(prng) % 64] = av_lfg_get(prng) % (2*vals) -vals;

  239.         break;

  240.     case 2:

  241.         block[ 0] = av_lfg_get(prng) % (16*vals) - (8*vals);

  242.         block[63] = (block[0] & 1) ^ 1;

  243.         break;

  244.     }

  245. }

  246. 

  247. static void permute(DCTELEM dst[64], const DCTELEM src[64], int perm)

  248. {

  249.     int i;

  250. 

  251.     if (perm == MMX_PERM) {

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

  253.             dst[idct_mmx_perm[i]] = src[i];

  254.     } else if (perm == MMX_SIMPLE_PERM) {

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

  256.             dst[idct_simple_mmx_perm[i]] = src[i];

  257.     } else if (perm == SSE2_PERM) {

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

  259.             dst[(i & 0x38) | idct_sse2_row_perm[i & 7]] = src[i];

  260.     } else if (perm == PARTTRANS_PERM) {

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

  262.             dst[(i & 0x24) | ((i & 3) << 3) | ((i >> 3) & 3)] = src[i];

  263.     } else if (perm == TRANSPOSE_PERM) {

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

  265.             dst[(i>>3) | ((i<<3)&0x38)] = src[i];

  266.     } else {

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

  268.             dst[i] = src[i];

  269.     }

  270. }

  271. 

  272. static int dct_error(const struct algo *dct, int test, int is_idct, int speed, const int bits)

  273. {

  274.     void (*ref)(DCTELEM *block) = is_idct ? ff_ref_idct : ff_ref_fdct;

  275.     int it, i, scale;

  276.     int err_inf, v;

  277.     int64_t err2, ti, ti1, it1, err_sum = 0;

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

  279.     int maxout = 0;

  280.     int blockSumErrMax = 0, blockSumErr;

  281.     AVLFG prng;

  282.     const int vals=1<<bits;

  283.     double omse, ome;

  284.     int spec_err;

  285. 

  286.     av_lfg_init(&prng, 1);

  287. 

  288.     err_inf = 0;

  289.     err2 = 0;

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

  291.         sysErr[i] = 0;

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

  293.         init_block(block1, test, is_idct, &prng, vals);

  294.         permute(block, block1, dct->format);

  295. 

  296.         dct->func(block);

  297.         mmx_emms();

  298. 

  299.         if (dct->format == SCALE_PERM) {

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

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

  302.                 block[i] = (block[i] * scale) >> AANSCALE_BITS;

  303.             }

  304.         }

  305. 

  306.         ref(block1);

  307. 

  308.         blockSumErr = 0;

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

  310.             int err = block[i] - block1[i];

  311.             err_sum += err;

  312.             v = abs(err);

  313.             if (v > err_inf)

  314.                 err_inf = v;

  315.             err2 += v * v;

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

  317.             blockSumErr += v;

  318.             if (abs(block[i]) > maxout)

  319.                 maxout = abs(block[i]);

  320.         }

  321.         if (blockSumErrMax < blockSumErr)

  322.             blockSumErrMax = blockSumErr;

  323.     }

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

  325.         sysErrMax = FFMAX(sysErrMax, FFABS(sysErr[i]));

  326. 

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

  328.         if (i % 8 == 0)

  329.             printf("\n");

  330.         printf("%7d ", (int) sysErr[i]);

  331.     }

  332.     printf("\n");

  333. 

  334.     omse = (double) err2 / NB_ITS / 64;

  335.     ome  = (double) err_sum / NB_ITS / 64;

  336. 

  337.     spec_err = is_idct && (err_inf > 1 || omse > 0.02 || fabs(ome) > 0.0015);

  338. 

  339.     printf("%s %s: max_err=%d omse=%0.8f ome=%0.8f syserr=%0.8f maxout=%d blockSumErr=%d\n",

  340.            is_idct ? "IDCT" : "DCT", dct->name, err_inf,

  341.            omse, ome, (double) sysErrMax / NB_ITS,

  342.            maxout, blockSumErrMax);

  343. 

  344.     if (spec_err && !dct->nonspec)

  345.         return 1;

  346. 

  347.     if (!speed)

  348.         return 0;

  349. 

  350.     /* speed test */

  351. 

  352.     init_block(block, test, is_idct, &prng, vals);

  353.     permute(block1, block, dct->format);

  354. 

  355.     ti = gettime();

  356.     it1 = 0;

  357.     do {

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

  359.             memcpy(block, block1, sizeof(block));

  360.             dct->func(block);

  361.         }

  362.         it1 += NB_ITS_SPEED;

  363.         ti1 = gettime() - ti;

  364.     } while (ti1 < 1000000);

  365.     mmx_emms();

  366. 

  367.     printf("%s %s: %0.1f kdct/s\n", is_idct ? "IDCT" : "DCT", dct->name,

  368.            (double) it1 * 1000.0 / (double) ti1);

  369. 

  370.     return 0;

  371. }

  372. 

  373. DECLARE_ALIGNED(8, static uint8_t, img_dest)[64];

  374. DECLARE_ALIGNED(8, static uint8_t, img_dest1)[64];

  375. 

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

  377. {

  378.     static int init;

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

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

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

  382.     double s, sum, v;

  383.     int i, j, k;

  384. 

  385.     if (!init) {

  386.         init = 1;

  387. 

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

  389.             sum = 0;

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

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

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

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

  394.             }

  395.         }

  396. 

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

  398.             sum = 0;

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

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

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

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

  403.             }

  404.         }

  405.     }

  406. 

  407.     /* butterfly */

  408.     s = 0.5 * sqrt(2.0);

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

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

  411.             block1[8 * (2 * i) + j] =

  412.                 (block[8 * (2 * i) + j] + block[8 * (2 * i + 1) + j]) * s;

  413.             block1[8 * (2 * i + 1) + j] =

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

  415.         }

  416.     }

  417. 

  418.     /* idct8 on lines */

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

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

  421.             sum = 0;

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

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

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

  425.         }

  426.     }

  427. 

  428.     /* idct4 */

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

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

  431.             /* top */

  432.             sum = 0;

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

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

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

  436. 

  437.             /* bottom */

  438.             sum = 0;

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

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

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

  442.         }

  443.     }

  444. 

  445.     /* clamp and store the result */

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

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

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

  449.             if      (v < 0)   v = 0;

  450.             else if (v > 255) v = 255;

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

  452.         }

  453.     }

  454. }

  455. 

  456. static void idct248_error(const char *name,

  457.                           void (*idct248_put)(uint8_t *dest, int line_size,

  458.                                               int16_t *block),

  459.                           int speed)

  460. {

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

  462.     AVLFG prng;

  463. 

  464.     av_lfg_init(&prng, 1);

  465. 

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

  467.        important here) */

  468.     err_max = 0;

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

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

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

  472.             block1[i] = av_lfg_get(&prng) % 256 - 128;

  473.         block1[0] += 1024;

  474. 

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

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

  477.         idct248_ref(img_dest1, 8, block);

  478. 

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

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

  481.         idct248_put(img_dest, 8, block);

  482. 

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

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

  485.             if (v == 255)

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

  487.             if (v > err_max)

  488.                 err_max = v;

  489.         }

  490. #if 0

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

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

  493.             int j;

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

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

  496.             }

  497.             printf("\n");

  498.         }

  499. 

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

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

  502.             int j;

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

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

  505.             }

  506.             printf("\n");

  507.         }

  508. #endif

  509.     }

  510.     printf("%s %s: err_inf=%d\n", 1 ? "IDCT248" : "DCT248", name, err_max);

  511. 

  512.     if (!speed)

  513.         return;

  514. 

  515.     ti = gettime();

  516.     it1 = 0;

  517.     do {

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

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

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

  521.             idct248_put(img_dest, 8, block);

  522.         }

  523.         it1 += NB_ITS_SPEED;

  524.         ti1 = gettime() - ti;

  525.     } while (ti1 < 1000000);

  526.     mmx_emms();

  527. 

  528.     printf("%s %s: %0.1f kdct/s\n", 1 ? "IDCT248" : "DCT248", name,

  529.            (double) it1 * 1000.0 / (double) ti1);

  530. }

  531. 

  532. static void help(void)

  533. {

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

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

  536.            "            1 -> test with random sparse matrixes\n"

  537.            "            2 -> do 3. test from mpeg4 std\n"

  538.            "bits        Number of time domain bits to use, 8 is default\n"

  539.            "-i          test IDCT implementations\n"

  540.            "-4          test IDCT248 implementations\n"

  541.            "-t          speed test\n");

  542. }

  543. 

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

  545. {

  546.     int test_idct = 0, test_248_dct = 0;

  547.     int c, i;

  548.     int test = 1;

  549.     int speed = 0;

  550.     int err = 0;

  551.     int bits=8;

  552. 

  553.     cpu_flags = av_get_cpu_flags();

  554. 

  555.     ff_ref_dct_init();

  556.     idct_mmx_init();

  557. 

  558.     for (i = 0; i < 256; i++)

  559.         cropTbl[i + MAX_NEG_CROP] = i;

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

  561.         cropTbl[i] = 0;

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

  563.     }

  564. 

  565.     for (;;) {

  566.         c = getopt(argc, argv, "ih4t");

  567.         if (c == -1)

  568.             break;

  569.         switch (c) {

  570.         case 'i':

  571.             test_idct = 1;

  572.             break;

  573.         case '4':

  574.             test_248_dct = 1;

  575.             break;

  576.         case 't':

  577.             speed = 1;

  578.             break;

  579.         default:

  580.         case 'h':

  581.             help();

  582.             return 0;

  583.         }

  584.     }

  585. 

  586.     if (optind < argc)

  587.         test = atoi(argv[optind]);

  588.     if(optind+1 < argc) bits= atoi(argv[optind+1]);

  589. 

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

  591. 

  592.     if (test_248_dct) {

  593.         idct248_error("SIMPLE-C", ff_simple_idct248_put, speed);

  594.     } else {

  595.         const struct algo *algos = test_idct ? idct_tab : fdct_tab;

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

  597.             if (!(~cpu_flags & algos[i].mm_support)) {

  598.                 err |= dct_error(&algos[i], test, test_idct, speed, bits);

  599.             }

  600.     }

  601. 

  602.     return err;

  603. }