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FFmpeg/libavcodec/dsputil.c

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  1. /*

  2.  * DSP utils

  3.  * Copyright (c) 2000, 2001 Gerard Lantau.

  4.  *

  5.  * This program is free software; you can redistribute it and/or modify

  6.  * it under the terms of the GNU General Public License as published by

  7.  * the Free Software Foundation; either version 2 of the License, or

  8.  * (at your option) any later version.

  9.  *

  10.  * This program is distributed in the hope that it will be useful,

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

  12.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  13.  * GNU General Public License for more details.

  14.  *

  15.  * You should have received a copy of the GNU General Public License

  16.  * along with this program; if not, write to the Free Software

  17.  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

  18.  */

  19. #include <stdlib.h>

  20. #include <stdio.h>

  21. #include "avcodec.h"

  22. #include "dsputil.h"

  23. #include "simple_idct.h"

  24. 

  25. void (*ff_idct)(DCTELEM *block);

  26. void (*get_pixels)(DCTELEM *block, const UINT8 *pixels, int line_size);

  27. void (*put_pixels_clamped)(const DCTELEM *block, UINT8 *pixels, int line_size);

  28. void (*add_pixels_clamped)(const DCTELEM *block, UINT8 *pixels, int line_size);

  29. 

  30. op_pixels_abs_func pix_abs16x16;

  31. op_pixels_abs_func pix_abs16x16_x2;

  32. op_pixels_abs_func pix_abs16x16_y2;

  33. op_pixels_abs_func pix_abs16x16_xy2;

  34. 

  35. UINT8 cropTbl[256 + 2 * MAX_NEG_CROP];

  36. UINT32 squareTbl[512];

  37. 

  38. extern UINT16 default_intra_matrix[64];

  39. extern UINT16 default_non_intra_matrix[64];

  40. 

  41. UINT8 zigzag_direct[64] = {

  42.     0, 1, 8, 16, 9, 2, 3, 10,

  43.     17, 24, 32, 25, 18, 11, 4, 5,

  44.     12, 19, 26, 33, 40, 48, 41, 34,

  45.     27, 20, 13, 6, 7, 14, 21, 28,

  46.     35, 42, 49, 56, 57, 50, 43, 36,

  47.     29, 22, 15, 23, 30, 37, 44, 51,

  48.     58, 59, 52, 45, 38, 31, 39, 46,

  49.     53, 60, 61, 54, 47, 55, 62, 63

  50. };

  51. 

  52. UINT8 ff_alternate_horizontal_scan[64] = {

  53.     0,  1,  2,  3,  8,  9, 16, 17, 

  54.     10, 11,  4,  5,  6,  7, 15, 14,

  55.     13, 12, 19, 18, 24, 25, 32, 33, 

  56.     26, 27, 20, 21, 22, 23, 28, 29,

  57.     30, 31, 34, 35, 40, 41, 48, 49, 

  58.     42, 43, 36, 37, 38, 39, 44, 45,

  59.     46, 47, 50, 51, 56, 57, 58, 59, 

  60.     52, 53, 54, 55, 60, 61, 62, 63,

  61. };

  62. 

  63. UINT8 ff_alternate_vertical_scan[64] = {

  64.     0,  8, 16, 24,  1,  9,  2, 10, 

  65.     17, 25, 32, 40, 48, 56, 57, 49,

  66.     41, 33, 26, 18,  3, 11,  4, 12, 

  67.     19, 27, 34, 42, 50, 58, 35, 43,

  68.     51, 59, 20, 28,  5, 13,  6, 14, 

  69.     21, 29, 36, 44, 52, 60, 37, 45,

  70.     53, 61, 22, 30,  7, 15, 23, 31, 

  71.     38, 46, 54, 62, 39, 47, 55, 63,

  72. };

  73. 

  74. 

  75. static UINT8 simple_mmx_permutation[64]={

  76. 	0x00, 0x08, 0x01, 0x09, 0x04, 0x0C, 0x05, 0x0D,

  77. 	0x10, 0x18, 0x11, 0x19, 0x14, 0x1C, 0x15, 0x1D,

  78. 	0x02, 0x0A, 0x03, 0x0B, 0x06, 0x0E, 0x07, 0x0F,

  79. 	0x12, 0x1A, 0x13, 0x1B, 0x16, 0x1E, 0x17, 0x1F,

  80. 	0x20, 0x28, 0x21, 0x29, 0x24, 0x2C, 0x25, 0x2D,

  81. 	0x30, 0x38, 0x31, 0x39, 0x34, 0x3C, 0x35, 0x3D,

  82. 	0x22, 0x2A, 0x23, 0x2B, 0x26, 0x2E, 0x27, 0x2F,

  83. 	0x32, 0x3A, 0x33, 0x3B, 0x36, 0x3E, 0x37, 0x3F,

  84. };

  85. 

  86. UINT8 permutation[64];

  87. //UINT8 invPermutation[64];

  88. 

  89. void get_pixels_c(DCTELEM *block, const UINT8 *pixels, int line_size)

  90. {

  91.     DCTELEM *p;

  92.     const UINT8 *pix;

  93.     int i;

  94. 

  95.     /* read the pixels */

  96.     p = block;

  97.     pix = pixels;

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

  99.         p[0] = pix[0];

  100.         p[1] = pix[1];

  101.         p[2] = pix[2];

  102.         p[3] = pix[3];

  103.         p[4] = pix[4];

  104.         p[5] = pix[5];

  105.         p[6] = pix[6];

  106.         p[7] = pix[7];

  107.         pix += line_size;

  108.         p += 8;

  109.     }

  110. }

  111. 

  112. void put_pixels_clamped_c(const DCTELEM *block, UINT8 *pixels, int line_size)

  113. {

  114.     const DCTELEM *p;

  115.     UINT8 *pix;

  116.     int i;

  117.     UINT8 *cm = cropTbl + MAX_NEG_CROP;

  118.     

  119.     /* read the pixels */

  120.     p = block;

  121.     pix = pixels;

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

  123.         pix[0] = cm[p[0]];

  124.         pix[1] = cm[p[1]];

  125.         pix[2] = cm[p[2]];

  126.         pix[3] = cm[p[3]];

  127.         pix[4] = cm[p[4]];

  128.         pix[5] = cm[p[5]];

  129.         pix[6] = cm[p[6]];

  130.         pix[7] = cm[p[7]];

  131.         pix += line_size;

  132.         p += 8;

  133.     }

  134. }

  135. 

  136. void add_pixels_clamped_c(const DCTELEM *block, UINT8 *pixels, int line_size)

  137. {

  138.     const DCTELEM *p;

  139.     UINT8 *pix;

  140.     int i;

  141.     UINT8 *cm = cropTbl + MAX_NEG_CROP;

  142.     

  143.     /* read the pixels */

  144.     p = block;

  145.     pix = pixels;

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

  147.         pix[0] = cm[pix[0] + p[0]];

  148.         pix[1] = cm[pix[1] + p[1]];

  149.         pix[2] = cm[pix[2] + p[2]];

  150.         pix[3] = cm[pix[3] + p[3]];

  151.         pix[4] = cm[pix[4] + p[4]];

  152.         pix[5] = cm[pix[5] + p[5]];

  153.         pix[6] = cm[pix[6] + p[6]];

  154.         pix[7] = cm[pix[7] + p[7]];

  155.         pix += line_size;

  156.         p += 8;

  157.     }

  158. }

  159. 

  160. #define PIXOP(BTYPE, OPNAME, OP, INCR)                                                   \

  161.                                                                                          \

  162. static void OPNAME ## _pixels(BTYPE *block, const UINT8 *pixels, int line_size, int h)    \

  163. {                                                                                        \

  164.     BTYPE *p;                                                                            \

  165.     const UINT8 *pix;                                                                    \

  166.                                                                                          \

  167.     p = block;                                                                           \

  168.     pix = pixels;                                                                        \

  169.     do {                                                                                 \

  170.         OP(p[0], pix[0]);                                                                  \

  171.         OP(p[1], pix[1]);                                                                  \

  172.         OP(p[2], pix[2]);                                                                  \

  173.         OP(p[3], pix[3]);                                                                  \

  174.         OP(p[4], pix[4]);                                                                  \

  175.         OP(p[5], pix[5]);                                                                  \

  176.         OP(p[6], pix[6]);                                                                  \

  177.         OP(p[7], pix[7]);                                                                  \

  178.         pix += line_size;                                                                \

  179.         p += INCR;                                                                       \

  180.     } while (--h);;                                                                       \

  181. }                                                                                        \

  182.                                                                                          \

  183. static void OPNAME ## _pixels_x2(BTYPE *block, const UINT8 *pixels, int line_size, int h)     \

  184. {                                                                                        \

  185.     BTYPE *p;                                                                          \

  186.     const UINT8 *pix;                                                                    \

  187.                                                                                          \

  188.     p = block;                                                                           \

  189.     pix = pixels;                                                                        \

  190.     do {                                                                   \

  191.         OP(p[0], avg2(pix[0], pix[1]));                                                    \

  192.         OP(p[1], avg2(pix[1], pix[2]));                                                    \

  193.         OP(p[2], avg2(pix[2], pix[3]));                                                    \

  194.         OP(p[3], avg2(pix[3], pix[4]));                                                    \

  195.         OP(p[4], avg2(pix[4], pix[5]));                                                    \

  196.         OP(p[5], avg2(pix[5], pix[6]));                                                    \

  197.         OP(p[6], avg2(pix[6], pix[7]));                                                    \

  198.         OP(p[7], avg2(pix[7], pix[8]));                                                    \

  199.         pix += line_size;                                                                \

  200.         p += INCR;                                                                       \

  201.     } while (--h);                                                                        \

  202. }                                                                                        \

  203.                                                                                          \

  204. static void OPNAME ## _pixels_y2(BTYPE *block, const UINT8 *pixels, int line_size, int h)     \

  205. {                                                                                        \

  206.     BTYPE *p;                                                                          \

  207.     const UINT8 *pix;                                                                    \

  208.     const UINT8 *pix1;                                                                   \

  209.                                                                                          \

  210.     p = block;                                                                           \

  211.     pix = pixels;                                                                        \

  212.     pix1 = pixels + line_size;                                                           \

  213.     do {                                                                                 \

  214.         OP(p[0], avg2(pix[0], pix1[0]));                                                   \

  215.         OP(p[1], avg2(pix[1], pix1[1]));                                                   \

  216.         OP(p[2], avg2(pix[2], pix1[2]));                                                   \

  217.         OP(p[3], avg2(pix[3], pix1[3]));                                                   \

  218.         OP(p[4], avg2(pix[4], pix1[4]));                                                   \

  219.         OP(p[5], avg2(pix[5], pix1[5]));                                                   \

  220.         OP(p[6], avg2(pix[6], pix1[6]));                                                   \

  221.         OP(p[7], avg2(pix[7], pix1[7]));                                                   \

  222.         pix += line_size;                                                                \

  223.         pix1 += line_size;                                                               \

  224.         p += INCR;                                                                       \

  225.     } while(--h);                                                                         \

  226. }                                                                                        \

  227.                                                                                          \

  228. static void OPNAME ## _pixels_xy2(BTYPE *block, const UINT8 *pixels, int line_size, int h)    \

  229. {                                                                                        \

  230.     BTYPE *p;                                                                          \

  231.     const UINT8 *pix;                                                                    \

  232.     const UINT8 *pix1;                                                                   \

  233.                                                                                          \

  234.     p = block;                                                                           \

  235.     pix = pixels;                                                                        \

  236.     pix1 = pixels + line_size;                                                           \

  237.     do {                                                                   \

  238.         OP(p[0], avg4(pix[0], pix[1], pix1[0], pix1[1]));                                  \

  239.         OP(p[1], avg4(pix[1], pix[2], pix1[1], pix1[2]));                                  \

  240.         OP(p[2], avg4(pix[2], pix[3], pix1[2], pix1[3]));                                  \

  241.         OP(p[3], avg4(pix[3], pix[4], pix1[3], pix1[4]));                                  \

  242.         OP(p[4], avg4(pix[4], pix[5], pix1[4], pix1[5]));                                  \

  243.         OP(p[5], avg4(pix[5], pix[6], pix1[5], pix1[6]));                                  \

  244.         OP(p[6], avg4(pix[6], pix[7], pix1[6], pix1[7]));                                  \

  245.         OP(p[7], avg4(pix[7], pix[8], pix1[7], pix1[8]));                                  \

  246.         pix += line_size;                                                                \

  247.         pix1 += line_size;                                                               \

  248.         p += INCR;                                                                       \

  249.     } while(--h);                                                                         \

  250. }                                                                                        \

  251.                                                                                          \

  252. void (*OPNAME ## _pixels_tab[4])(BTYPE *block, const UINT8 *pixels, int line_size, int h) = { \

  253.     OPNAME ## _pixels,                                                                   \

  254.     OPNAME ## _pixels_x2,                                                                \

  255.     OPNAME ## _pixels_y2,                                                                \

  256.     OPNAME ## _pixels_xy2,                                                               \

  257. };

  258. 

  259. 

  260. /* rounding primitives */

  261. #define avg2(a,b) ((a+b+1)>>1)

  262. #define avg4(a,b,c,d) ((a+b+c+d+2)>>2)

  263. 

  264. #define op_put(a, b) a = b

  265. #define op_avg(a, b) a = avg2(a, b)

  266. #define op_sub(a, b) a -= b

  267. 

  268. PIXOP(UINT8, put, op_put, line_size)

  269. PIXOP(UINT8, avg, op_avg, line_size)

  270. 

  271. PIXOP(DCTELEM, sub, op_sub, 8)

  272. 

  273. /* not rounding primitives */

  274. #undef avg2

  275. #undef avg4

  276. #define avg2(a,b) ((a+b)>>1)

  277. #define avg4(a,b,c,d) ((a+b+c+d+1)>>2)

  278. 

  279. PIXOP(UINT8, put_no_rnd, op_put, line_size)

  280. PIXOP(UINT8, avg_no_rnd, op_avg, line_size)

  281. 

  282. /* motion estimation */

  283. 

  284. #undef avg2

  285. #undef avg4

  286. #define avg2(a,b) ((a+b+1)>>1)

  287. #define avg4(a,b,c,d) ((a+b+c+d+2)>>2)

  288. 

  289. int pix_abs16x16_c(UINT8 *pix1, UINT8 *pix2, int line_size, int h)

  290. {

  291.     int s, i;

  292. 

  293.     s = 0;

  294.     for(i=0;i<h;i++) {

  295.         s += abs(pix1[0] - pix2[0]);

  296.         s += abs(pix1[1] - pix2[1]);

  297.         s += abs(pix1[2] - pix2[2]);

  298.         s += abs(pix1[3] - pix2[3]);

  299.         s += abs(pix1[4] - pix2[4]);

  300.         s += abs(pix1[5] - pix2[5]);

  301.         s += abs(pix1[6] - pix2[6]);

  302.         s += abs(pix1[7] - pix2[7]);

  303.         s += abs(pix1[8] - pix2[8]);

  304.         s += abs(pix1[9] - pix2[9]);

  305.         s += abs(pix1[10] - pix2[10]);

  306.         s += abs(pix1[11] - pix2[11]);

  307.         s += abs(pix1[12] - pix2[12]);

  308.         s += abs(pix1[13] - pix2[13]);

  309.         s += abs(pix1[14] - pix2[14]);

  310.         s += abs(pix1[15] - pix2[15]);

  311.         pix1 += line_size;

  312.         pix2 += line_size;

  313.     }

  314.     return s;

  315. }

  316. 

  317. int pix_abs16x16_x2_c(UINT8 *pix1, UINT8 *pix2, int line_size, int h)

  318. {

  319.     int s, i;

  320. 

  321.     s = 0;

  322.     for(i=0;i<h;i++) {

  323.         s += abs(pix1[0] - avg2(pix2[0], pix2[1]));

  324.         s += abs(pix1[1] - avg2(pix2[1], pix2[2]));

  325.         s += abs(pix1[2] - avg2(pix2[2], pix2[3]));

  326.         s += abs(pix1[3] - avg2(pix2[3], pix2[4]));

  327.         s += abs(pix1[4] - avg2(pix2[4], pix2[5]));

  328.         s += abs(pix1[5] - avg2(pix2[5], pix2[6]));

  329.         s += abs(pix1[6] - avg2(pix2[6], pix2[7]));

  330.         s += abs(pix1[7] - avg2(pix2[7], pix2[8]));

  331.         s += abs(pix1[8] - avg2(pix2[8], pix2[9]));

  332.         s += abs(pix1[9] - avg2(pix2[9], pix2[10]));

  333.         s += abs(pix1[10] - avg2(pix2[10], pix2[11]));

  334.         s += abs(pix1[11] - avg2(pix2[11], pix2[12]));

  335.         s += abs(pix1[12] - avg2(pix2[12], pix2[13]));

  336.         s += abs(pix1[13] - avg2(pix2[13], pix2[14]));

  337.         s += abs(pix1[14] - avg2(pix2[14], pix2[15]));

  338.         s += abs(pix1[15] - avg2(pix2[15], pix2[16]));

  339.         pix1 += line_size;

  340.         pix2 += line_size;

  341.     }

  342.     return s;

  343. }

  344. 

  345. int pix_abs16x16_y2_c(UINT8 *pix1, UINT8 *pix2, int line_size, int h)

  346. {

  347.     int s, i;

  348.     UINT8 *pix3 = pix2 + line_size;

  349. 

  350.     s = 0;

  351.     for(i=0;i<h;i++) {

  352.         s += abs(pix1[0] - avg2(pix2[0], pix3[0]));

  353.         s += abs(pix1[1] - avg2(pix2[1], pix3[1]));

  354.         s += abs(pix1[2] - avg2(pix2[2], pix3[2]));

  355.         s += abs(pix1[3] - avg2(pix2[3], pix3[3]));

  356.         s += abs(pix1[4] - avg2(pix2[4], pix3[4]));

  357.         s += abs(pix1[5] - avg2(pix2[5], pix3[5]));

  358.         s += abs(pix1[6] - avg2(pix2[6], pix3[6]));

  359.         s += abs(pix1[7] - avg2(pix2[7], pix3[7]));

  360.         s += abs(pix1[8] - avg2(pix2[8], pix3[8]));

  361.         s += abs(pix1[9] - avg2(pix2[9], pix3[9]));

  362.         s += abs(pix1[10] - avg2(pix2[10], pix3[10]));

  363.         s += abs(pix1[11] - avg2(pix2[11], pix3[11]));

  364.         s += abs(pix1[12] - avg2(pix2[12], pix3[12]));

  365.         s += abs(pix1[13] - avg2(pix2[13], pix3[13]));

  366.         s += abs(pix1[14] - avg2(pix2[14], pix3[14]));

  367.         s += abs(pix1[15] - avg2(pix2[15], pix3[15]));

  368.         pix1 += line_size;

  369.         pix2 += line_size;

  370.         pix3 += line_size;

  371.     }

  372.     return s;

  373. }

  374. 

  375. int pix_abs16x16_xy2_c(UINT8 *pix1, UINT8 *pix2, int line_size, int h)

  376. {

  377.     int s, i;

  378.     UINT8 *pix3 = pix2 + line_size;

  379. 

  380.     s = 0;

  381.     for(i=0;i<h;i++) {

  382.         s += abs(pix1[0] - avg4(pix2[0], pix2[1], pix3[0], pix3[1]));

  383.         s += abs(pix1[1] - avg4(pix2[1], pix2[2], pix3[1], pix3[2]));

  384.         s += abs(pix1[2] - avg4(pix2[2], pix2[3], pix3[2], pix3[3]));

  385.         s += abs(pix1[3] - avg4(pix2[3], pix2[4], pix3[3], pix3[4]));

  386.         s += abs(pix1[4] - avg4(pix2[4], pix2[5], pix3[4], pix3[5]));

  387.         s += abs(pix1[5] - avg4(pix2[5], pix2[6], pix3[5], pix3[6]));

  388.         s += abs(pix1[6] - avg4(pix2[6], pix2[7], pix3[6], pix3[7]));

  389.         s += abs(pix1[7] - avg4(pix2[7], pix2[8], pix3[7], pix3[8]));

  390.         s += abs(pix1[8] - avg4(pix2[8], pix2[9], pix3[8], pix3[9]));

  391.         s += abs(pix1[9] - avg4(pix2[9], pix2[10], pix3[9], pix3[10]));

  392.         s += abs(pix1[10] - avg4(pix2[10], pix2[11], pix3[10], pix3[11]));

  393.         s += abs(pix1[11] - avg4(pix2[11], pix2[12], pix3[11], pix3[12]));

  394.         s += abs(pix1[12] - avg4(pix2[12], pix2[13], pix3[12], pix3[13]));

  395.         s += abs(pix1[13] - avg4(pix2[13], pix2[14], pix3[13], pix3[14]));

  396.         s += abs(pix1[14] - avg4(pix2[14], pix2[15], pix3[14], pix3[15]));

  397.         s += abs(pix1[15] - avg4(pix2[15], pix2[16], pix3[15], pix3[16]));

  398.         pix1 += line_size;

  399.         pix2 += line_size;

  400.         pix3 += line_size;

  401.     }

  402.     return s;

  403. }

  404. 

  405. /* permute block according so that it corresponds to the MMX idct

  406.    order */

  407. #ifdef SIMPLE_IDCT

  408.  /* general permutation, but perhaps slightly slower */

  409. void block_permute(INT16 *block)

  410. {

  411. 	int i;

  412. 	INT16 temp[64];

  413. 

  414. 	for(i=0; i<64; i++) temp[ block_permute_op(i) ] = block[i];

  415. 

  416. 	for(i=0; i<64; i++) block[i] = temp[i];

  417. }

  418. #else

  419. 

  420. void block_permute(INT16 *block)

  421. {

  422.     int tmp1, tmp2, tmp3, tmp4, tmp5, tmp6;

  423.     int i;

  424. 

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

  426.         tmp1 = block[1];

  427.         tmp2 = block[2];

  428.         tmp3 = block[3];

  429.         tmp4 = block[4];

  430.         tmp5 = block[5];

  431.         tmp6 = block[6];

  432.         block[1] = tmp2;

  433.         block[2] = tmp4;

  434.         block[3] = tmp6;

  435.         block[4] = tmp1;

  436.         block[5] = tmp3;

  437.         block[6] = tmp5;

  438.         block += 8;

  439.     }

  440. }

  441. #endif

  442. 

  443. void dsputil_init(void)

  444. {

  445.     int i, j;

  446.     int use_permuted_idct;

  447. 

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

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

  450.         cropTbl[i] = 0;

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

  452.     }

  453. 

  454.     for(i=0;i<512;i++) {

  455.         squareTbl[i] = (i - 256) * (i - 256);

  456.     }

  457. 

  458. #ifdef SIMPLE_IDCT

  459.     ff_idct = simple_idct;

  460. #else

  461.     ff_idct = j_rev_dct;

  462. #endif

  463.     get_pixels = get_pixels_c;

  464.     put_pixels_clamped = put_pixels_clamped_c;

  465.     add_pixels_clamped = add_pixels_clamped_c;

  466. 

  467.     pix_abs16x16 = pix_abs16x16_c;

  468.     pix_abs16x16_x2 = pix_abs16x16_x2_c;

  469.     pix_abs16x16_y2 = pix_abs16x16_y2_c;

  470.     pix_abs16x16_xy2 = pix_abs16x16_xy2_c;

  471.     av_fdct = jpeg_fdct_ifast;

  472. 

  473.     use_permuted_idct = 1;

  474. 

  475. #ifdef HAVE_MMX

  476.     dsputil_init_mmx();

  477. #endif

  478. #ifdef ARCH_ARMV4L

  479.     dsputil_init_armv4l();

  480. #endif

  481. #ifdef HAVE_MLIB

  482.     dsputil_init_mlib();

  483.     use_permuted_idct = 0;

  484. #endif

  485. 

  486. #ifdef SIMPLE_IDCT

  487.     if(ff_idct == simple_idct) use_permuted_idct=0;

  488. #endif

  489. 

  490.     if(use_permuted_idct)

  491. #ifdef SIMPLE_IDCT

  492.         for(i=0; i<64; i++) permutation[i]= simple_mmx_permutation[i];

  493. #else

  494.         for(i=0; i<64; i++) permutation[i]= (i & 0x38) | ((i & 6) >> 1) | ((i & 1) << 2);

  495. #endif

  496.     else

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

  498. 

  499.     if (use_permuted_idct) {

  500.         /* permute for IDCT */

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

  502.             j = zigzag_direct[i];

  503.             zigzag_direct[i] = block_permute_op(j);

  504.             j = ff_alternate_horizontal_scan[i];

  505.             ff_alternate_horizontal_scan[i] = block_permute_op(j);

  506.             j = ff_alternate_vertical_scan[i];

  507.             ff_alternate_vertical_scan[i] = block_permute_op(j);

  508.         }

  509.         block_permute(default_intra_matrix);

  510.         block_permute(default_non_intra_matrix);

  511.     }

  512. }