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FFmpeg/libavcodec/ppc/fdctdsp.c

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  1. /*

  2.  * Copyright (C) 2003  James Klicman <james@klicman.org>

  3.  *

  4.  * This file is part of Libav.

  5.  *

  6.  * Libav is free software; you can redistribute it and/or

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

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

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

  10.  *

  11.  * Libav is distributed in the hope that it will be useful,

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

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

  14.  * Lesser General Public License for more details.

  15.  *

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

  17.  * License along with Libav; if not, write to the Free Software

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

  19.  */

  20. 

  21. #include "config.h"

  22. #if HAVE_ALTIVEC_H

  23. #include <altivec.h>

  24. #endif

  25. 

  26. #include "libavutil/attributes.h"

  27. #include "libavutil/cpu.h"

  28. #include "libavutil/ppc/cpu.h"

  29. #include "libavcodec/fdctdsp.h"

  30. #include "fdctdsp.h"

  31. 

  32. #if HAVE_ALTIVEC

  33. 

  34. #define vs16(v)   ((vector signed short) (v))

  35. #define vs32(v)     ((vector signed int) (v))

  36. #define  vu8(v)  ((vector unsigned char) (v))

  37. #define vu16(v) ((vector unsigned short) (v))

  38. #define vu32(v)   ((vector unsigned int) (v))

  39. 

  40. #define C1     0.98078525066375732421875000 /* cos(1 * PI / 16) */

  41. #define C2     0.92387950420379638671875000 /* cos(2 * PI / 16) */

  42. #define C3     0.83146959543228149414062500 /* cos(3 * PI / 16) */

  43. #define C4     0.70710676908493041992187500 /* cos(4 * PI / 16) */

  44. #define C5     0.55557024478912353515625000 /* cos(5 * PI / 16) */

  45. #define C6     0.38268342614173889160156250 /* cos(6 * PI / 16) */

  46. #define C7     0.19509032368659973144531250 /* cos(7 * PI / 16) */

  47. #define SQRT_2 1.41421353816986083984375000 /* sqrt(2)          */

  48. 

  49. #define W0 -(2 * C2)

  50. #define W1  (2 * C6)

  51. #define W2 (SQRT_2 * C6)

  52. #define W3 (SQRT_2 * C3)

  53. #define W4 (SQRT_2 * (-C1 + C3 + C5 - C7))

  54. #define W5 (SQRT_2 *  (C1 + C3 - C5 + C7))

  55. #define W6 (SQRT_2 *  (C1 + C3 + C5 - C7))

  56. #define W7 (SQRT_2 *  (C1 + C3 - C5 - C7))

  57. #define W8 (SQRT_2 *  (C7 - C3))

  58. #define W9 (SQRT_2 * (-C1 - C3))

  59. #define WA (SQRT_2 * (-C3 - C5))

  60. #define WB (SQRT_2 *  (C5 - C3))

  61. 

  62. static vector float fdctconsts[3] = {

  63.     { W0, W1, W2, W3 },

  64.     { W4, W5, W6, W7 },

  65.     { W8, W9, WA, WB }

  66. };

  67. 

  68. #define LD_W0 vec_splat(cnsts0, 0)

  69. #define LD_W1 vec_splat(cnsts0, 1)

  70. #define LD_W2 vec_splat(cnsts0, 2)

  71. #define LD_W3 vec_splat(cnsts0, 3)

  72. #define LD_W4 vec_splat(cnsts1, 0)

  73. #define LD_W5 vec_splat(cnsts1, 1)

  74. #define LD_W6 vec_splat(cnsts1, 2)

  75. #define LD_W7 vec_splat(cnsts1, 3)

  76. #define LD_W8 vec_splat(cnsts2, 0)

  77. #define LD_W9 vec_splat(cnsts2, 1)

  78. #define LD_WA vec_splat(cnsts2, 2)

  79. #define LD_WB vec_splat(cnsts2, 3)

  80. 

  81. #define FDCTROW(b0, b1, b2, b3, b4, b5, b6, b7) /* {{{ */           \

  82.     x0 = vec_add(b0, b7);               /* x0 = b0 + b7; */         \

  83.     x7 = vec_sub(b0, b7);               /* x7 = b0 - b7; */         \

  84.     x1 = vec_add(b1, b6);               /* x1 = b1 + b6; */         \

  85.     x6 = vec_sub(b1, b6);               /* x6 = b1 - b6; */         \

  86.     x2 = vec_add(b2, b5);               /* x2 = b2 + b5; */         \

  87.     x5 = vec_sub(b2, b5);               /* x5 = b2 - b5; */         \

  88.     x3 = vec_add(b3, b4);               /* x3 = b3 + b4; */         \

  89.     x4 = vec_sub(b3, b4);               /* x4 = b3 - b4; */         \

  90.                                                                     \

  91.     b7 = vec_add(x0, x3);               /* b7 = x0 + x3; */         \

  92.     b1 = vec_add(x1, x2);               /* b1 = x1 + x2; */         \

  93.     b0 = vec_add(b7, b1);               /* b0 = b7 + b1; */         \

  94.     b4 = vec_sub(b7, b1);               /* b4 = b7 - b1; */         \

  95.                                                                     \

  96.     b2   = vec_sub(x0, x3);             /* b2 = x0 - x3; */         \

  97.     b6   = vec_sub(x1, x2);             /* b6 = x1 - x2; */         \

  98.     b5   = vec_add(b6, b2);             /* b5 = b6 + b2; */         \

  99.     cnst = LD_W2;                                                   \

  100.     b5   = vec_madd(cnst, b5, mzero);   /* b5 = b5 * W2; */         \

  101.     cnst = LD_W1;                                                   \

  102.     b2   = vec_madd(cnst, b2, b5);      /* b2 = b5 + b2 * W1; */    \

  103.     cnst = LD_W0;                                                   \

  104.     b6   = vec_madd(cnst, b6, b5);      /* b6 = b5 + b6 * W0; */    \

  105.                                                                     \

  106.     x0   = vec_add(x4, x7);             /* x0 = x4 + x7; */         \

  107.     x1   = vec_add(x5, x6);             /* x1 = x5 + x6; */         \

  108.     x2   = vec_add(x4, x6);             /* x2 = x4 + x6; */         \

  109.     x3   = vec_add(x5, x7);             /* x3 = x5 + x7; */         \

  110.     x8   = vec_add(x2, x3);             /* x8 = x2 + x3; */         \

  111.     cnst = LD_W3;                                                   \

  112.     x8   = vec_madd(cnst, x8, mzero);   /* x8 = x8 * W3; */         \

  113.                                                                     \

  114.     cnst = LD_W8;                                                   \

  115.     x0   = vec_madd(cnst, x0, mzero);   /* x0 *= W8; */             \

  116.     cnst = LD_W9;                                                   \

  117.     x1   = vec_madd(cnst, x1, mzero);   /* x1 *= W9; */             \

  118.     cnst = LD_WA;                                                   \

  119.     x2   = vec_madd(cnst, x2, x8);      /* x2 = x2 * WA + x8; */    \

  120.     cnst = LD_WB;                                                   \

  121.     x3   = vec_madd(cnst, x3, x8);      /* x3 = x3 * WB + x8; */    \

  122.                                                                     \

  123.     cnst = LD_W4;                                                   \

  124.     b7   = vec_madd(cnst, x4, x0);      /* b7 = x4 * W4 + x0; */    \

  125.     cnst = LD_W5;                                                   \

  126.     b5   = vec_madd(cnst, x5, x1);      /* b5 = x5 * W5 + x1; */    \

  127.     cnst = LD_W6;                                                   \

  128.     b3   = vec_madd(cnst, x6, x1);      /* b3 = x6 * W6 + x1; */    \

  129.     cnst = LD_W7;                                                   \

  130.     b1   = vec_madd(cnst, x7, x0);      /* b1 = x7 * W7 + x0; */    \

  131.                                                                     \

  132.     b7 = vec_add(b7, x2);               /* b7 = b7 + x2; */         \

  133.     b5 = vec_add(b5, x3);               /* b5 = b5 + x3; */         \

  134.     b3 = vec_add(b3, x2);               /* b3 = b3 + x2; */         \

  135.     b1 = vec_add(b1, x3)                /* b1 = b1 + x3; */         \

  136.     /* }}} */

  137. 

  138. #define FDCTCOL(b0, b1, b2, b3, b4, b5, b6, b7) /* {{{ */           \

  139.     x0 = vec_add(b0, b7);               /* x0 = b0 + b7; */         \

  140.     x7 = vec_sub(b0, b7);               /* x7 = b0 - b7; */         \

  141.     x1 = vec_add(b1, b6);               /* x1 = b1 + b6; */         \

  142.     x6 = vec_sub(b1, b6);               /* x6 = b1 - b6; */         \

  143.     x2 = vec_add(b2, b5);               /* x2 = b2 + b5; */         \

  144.     x5 = vec_sub(b2, b5);               /* x5 = b2 - b5; */         \

  145.     x3 = vec_add(b3, b4);               /* x3 = b3 + b4; */         \

  146.     x4 = vec_sub(b3, b4);               /* x4 = b3 - b4; */         \

  147.                                                                     \

  148.     b7 = vec_add(x0, x3);               /* b7 = x0 + x3; */         \

  149.     b1 = vec_add(x1, x2);               /* b1 = x1 + x2; */         \

  150.     b0 = vec_add(b7, b1);               /* b0 = b7 + b1; */         \

  151.     b4 = vec_sub(b7, b1);               /* b4 = b7 - b1; */         \

  152.                                                                     \

  153.     b2   = vec_sub(x0, x3);             /* b2 = x0 - x3; */         \

  154.     b6   = vec_sub(x1, x2);             /* b6 = x1 - x2; */         \

  155.     b5   = vec_add(b6, b2);             /* b5 = b6 + b2; */         \

  156.     cnst = LD_W2;                                                   \

  157.     b5   = vec_madd(cnst, b5, mzero);   /* b5 = b5 * W2; */         \

  158.     cnst = LD_W1;                                                   \

  159.     b2   = vec_madd(cnst, b2, b5);      /* b2 = b5 + b2 * W1; */    \

  160.     cnst = LD_W0;                                                   \

  161.     b6   = vec_madd(cnst, b6, b5);      /* b6 = b5 + b6 * W0; */    \

  162.                                                                     \

  163.     x0   = vec_add(x4, x7);             /* x0 = x4 + x7; */         \

  164.     x1   = vec_add(x5, x6);             /* x1 = x5 + x6; */         \

  165.     x2   = vec_add(x4, x6);             /* x2 = x4 + x6; */         \

  166.     x3   = vec_add(x5, x7);             /* x3 = x5 + x7; */         \

  167.     x8   = vec_add(x2, x3);             /* x8 = x2 + x3; */         \

  168.     cnst = LD_W3;                                                   \

  169.     x8   = vec_madd(cnst, x8, mzero);   /* x8 = x8 * W3; */         \

  170.                                                                     \

  171.     cnst = LD_W8;                                                   \

  172.     x0   = vec_madd(cnst, x0, mzero);   /* x0 *= W8; */             \

  173.     cnst = LD_W9;                                                   \

  174.     x1   = vec_madd(cnst, x1, mzero);   /* x1 *= W9; */             \

  175.     cnst = LD_WA;                                                   \

  176.     x2   = vec_madd(cnst, x2, x8);      /* x2 = x2 * WA + x8; */    \

  177.     cnst = LD_WB;                                                   \

  178.     x3   = vec_madd(cnst, x3, x8);      /* x3 = x3 * WB + x8; */    \

  179.                                                                     \

  180.     cnst = LD_W4;                                                   \

  181.     b7   = vec_madd(cnst, x4, x0);      /* b7 = x4 * W4 + x0; */    \

  182.     cnst = LD_W5;                                                   \

  183.     b5   = vec_madd(cnst, x5, x1);      /* b5 = x5 * W5 + x1; */    \

  184.     cnst = LD_W6;                                                   \

  185.     b3   = vec_madd(cnst, x6, x1);      /* b3 = x6 * W6 + x1; */    \

  186.     cnst = LD_W7;                                                   \

  187.     b1   = vec_madd(cnst, x7, x0);      /* b1 = x7 * W7 + x0; */    \

  188.                                                                     \

  189.     b7 = vec_add(b7, x2);               /* b7 += x2; */             \

  190.     b5 = vec_add(b5, x3);               /* b5 += x3; */             \

  191.     b3 = vec_add(b3, x2);               /* b3 += x2; */             \

  192.     b1 = vec_add(b1, x3)                /* b1 += x3; */             \

  193.     /* }}} */

  194. 

  195. /* two dimensional discrete cosine transform */

  196. void ff_fdct_altivec(int16_t *block)

  197. {

  198.     vector signed short *bp;

  199.     vector float *cp = fdctconsts;

  200.     vector float b00, b10, b20, b30, b40, b50, b60, b70;

  201.     vector float b01, b11, b21, b31, b41, b51, b61, b71;

  202.     vector float mzero, cnst, cnsts0, cnsts1, cnsts2;

  203.     vector float x0, x1, x2, x3, x4, x5, x6, x7, x8;

  204. 

  205.     /* setup constants {{{ */

  206.     /* mzero = -0.0 */

  207.     mzero  = ((vector float) vec_splat_u32(-1));

  208.     mzero  = ((vector float) vec_sl(vu32(mzero), vu32(mzero)));

  209.     cnsts0 = vec_ld(0, cp);

  210.     cp++;

  211.     cnsts1 = vec_ld(0, cp);

  212.     cp++;

  213.     cnsts2 = vec_ld(0, cp);

  214.     /* }}} */

  215. 

  216.     /* 8x8 matrix transpose (vector short[8]) {{{ */

  217. #define MERGE_S16(hl, a, b) vec_merge ## hl(vs16(a), vs16(b))

  218. 

  219.     bp  = (vector signed short *) block;

  220.     b00 = ((vector float) vec_ld(0,      bp));

  221.     b40 = ((vector float) vec_ld(16 * 4, bp));

  222.     b01 = ((vector float) MERGE_S16(h, b00, b40));

  223.     b11 = ((vector float) MERGE_S16(l, b00, b40));

  224.     bp++;

  225.     b10 = ((vector float) vec_ld(0,      bp));

  226.     b50 = ((vector float) vec_ld(16 * 4, bp));

  227.     b21 = ((vector float) MERGE_S16(h, b10, b50));

  228.     b31 = ((vector float) MERGE_S16(l, b10, b50));

  229.     bp++;

  230.     b20 = ((vector float) vec_ld(0,      bp));

  231.     b60 = ((vector float) vec_ld(16 * 4, bp));

  232.     b41 = ((vector float) MERGE_S16(h, b20, b60));

  233.     b51 = ((vector float) MERGE_S16(l, b20, b60));

  234.     bp++;

  235.     b30 = ((vector float) vec_ld(0,      bp));

  236.     b70 = ((vector float) vec_ld(16 * 4, bp));

  237.     b61 = ((vector float) MERGE_S16(h, b30, b70));

  238.     b71 = ((vector float) MERGE_S16(l, b30, b70));

  239. 

  240.     x0 = ((vector float) MERGE_S16(h, b01, b41));

  241.     x1 = ((vector float) MERGE_S16(l, b01, b41));

  242.     x2 = ((vector float) MERGE_S16(h, b11, b51));

  243.     x3 = ((vector float) MERGE_S16(l, b11, b51));

  244.     x4 = ((vector float) MERGE_S16(h, b21, b61));

  245.     x5 = ((vector float) MERGE_S16(l, b21, b61));

  246.     x6 = ((vector float) MERGE_S16(h, b31, b71));

  247.     x7 = ((vector float) MERGE_S16(l, b31, b71));

  248. 

  249.     b00 = ((vector float) MERGE_S16(h, x0, x4));

  250.     b10 = ((vector float) MERGE_S16(l, x0, x4));

  251.     b20 = ((vector float) MERGE_S16(h, x1, x5));

  252.     b30 = ((vector float) MERGE_S16(l, x1, x5));

  253.     b40 = ((vector float) MERGE_S16(h, x2, x6));

  254.     b50 = ((vector float) MERGE_S16(l, x2, x6));

  255.     b60 = ((vector float) MERGE_S16(h, x3, x7));

  256.     b70 = ((vector float) MERGE_S16(l, x3, x7));

  257. 

  258. #undef MERGE_S16

  259.     /* }}} */

  260. 

  261.     /* Some of the initial calculations can be done as vector short

  262.      * before conversion to vector float.  The following code section

  263.      * takes advantage of this. */

  264. 

  265.     /* fdct rows {{{ */

  266.     x0 = ((vector float) vec_add(vs16(b00), vs16(b70)));

  267.     x7 = ((vector float) vec_sub(vs16(b00), vs16(b70)));

  268.     x1 = ((vector float) vec_add(vs16(b10), vs16(b60)));

  269.     x6 = ((vector float) vec_sub(vs16(b10), vs16(b60)));

  270.     x2 = ((vector float) vec_add(vs16(b20), vs16(b50)));

  271.     x5 = ((vector float) vec_sub(vs16(b20), vs16(b50)));

  272.     x3 = ((vector float) vec_add(vs16(b30), vs16(b40)));

  273.     x4 = ((vector float) vec_sub(vs16(b30), vs16(b40)));

  274. 

  275.     b70 = ((vector float) vec_add(vs16(x0), vs16(x3)));

  276.     b10 = ((vector float) vec_add(vs16(x1), vs16(x2)));

  277. 

  278.     b00 = ((vector float) vec_add(vs16(b70), vs16(b10)));

  279.     b40 = ((vector float) vec_sub(vs16(b70), vs16(b10)));

  280. 

  281. #define CTF0(n)                                                    \

  282.     b ## n ## 1 = ((vector float) vec_unpackl(vs16(b ## n ## 0))); \

  283.     b ## n ## 0 = ((vector float) vec_unpackh(vs16(b ## n ## 0))); \

  284.     b ## n ## 1 = vec_ctf(vs32(b ## n ## 1), 0);                   \

  285.     b ## n ## 0 = vec_ctf(vs32(b ## n ## 0), 0)

  286. 

  287.     CTF0(0);

  288.     CTF0(4);

  289. 

  290.     b20 = ((vector float) vec_sub(vs16(x0), vs16(x3)));

  291.     b60 = ((vector float) vec_sub(vs16(x1), vs16(x2)));

  292. 

  293.     CTF0(2);

  294.     CTF0(6);

  295. 

  296. #undef CTF0

  297. 

  298.     x0 = vec_add(b60, b20);

  299.     x1 = vec_add(b61, b21);

  300. 

  301.     cnst = LD_W2;

  302.     x0   = vec_madd(cnst, x0, mzero);

  303.     x1   = vec_madd(cnst, x1, mzero);

  304.     cnst = LD_W1;

  305.     b20  = vec_madd(cnst, b20, x0);

  306.     b21  = vec_madd(cnst, b21, x1);

  307.     cnst = LD_W0;

  308.     b60  = vec_madd(cnst, b60, x0);

  309.     b61  = vec_madd(cnst, b61, x1);

  310. 

  311. #define CTFX(x, b)                                  \

  312.     b ## 0 = ((vector float) vec_unpackh(vs16(x))); \

  313.     b ## 1 = ((vector float) vec_unpackl(vs16(x))); \

  314.     b ## 0 = vec_ctf(vs32(b ## 0), 0);              \

  315.     b ## 1 = vec_ctf(vs32(b ## 1), 0)

  316. 

  317.     CTFX(x4, b7);

  318.     CTFX(x5, b5);

  319.     CTFX(x6, b3);

  320.     CTFX(x7, b1);

  321. 

  322. #undef CTFX

  323. 

  324.     x0   = vec_add(b70, b10);

  325.     x1   = vec_add(b50, b30);

  326.     x2   = vec_add(b70, b30);

  327.     x3   = vec_add(b50, b10);

  328.     x8   = vec_add(x2, x3);

  329.     cnst = LD_W3;

  330.     x8   = vec_madd(cnst, x8, mzero);

  331. 

  332.     cnst = LD_W8;

  333.     x0   = vec_madd(cnst, x0, mzero);

  334.     cnst = LD_W9;

  335.     x1   = vec_madd(cnst, x1, mzero);

  336.     cnst = LD_WA;

  337.     x2   = vec_madd(cnst, x2, x8);

  338.     cnst = LD_WB;

  339.     x3   = vec_madd(cnst, x3, x8);

  340. 

  341.     cnst = LD_W4;

  342.     b70  = vec_madd(cnst, b70, x0);

  343.     cnst = LD_W5;

  344.     b50  = vec_madd(cnst, b50, x1);

  345.     cnst = LD_W6;

  346.     b30  = vec_madd(cnst, b30, x1);

  347.     cnst = LD_W7;

  348.     b10  = vec_madd(cnst, b10, x0);

  349. 

  350.     b70 = vec_add(b70, x2);

  351.     b50 = vec_add(b50, x3);

  352.     b30 = vec_add(b30, x2);

  353.     b10 = vec_add(b10, x3);

  354. 

  355.     x0   = vec_add(b71, b11);

  356.     x1   = vec_add(b51, b31);

  357.     x2   = vec_add(b71, b31);

  358.     x3   = vec_add(b51, b11);

  359.     x8   = vec_add(x2, x3);

  360.     cnst = LD_W3;

  361.     x8   = vec_madd(cnst, x8, mzero);

  362. 

  363.     cnst = LD_W8;

  364.     x0   = vec_madd(cnst, x0, mzero);

  365.     cnst = LD_W9;

  366.     x1   = vec_madd(cnst, x1, mzero);

  367.     cnst = LD_WA;

  368.     x2   = vec_madd(cnst, x2, x8);

  369.     cnst = LD_WB;

  370.     x3   = vec_madd(cnst, x3, x8);

  371. 

  372.     cnst = LD_W4;

  373.     b71  = vec_madd(cnst, b71, x0);

  374.     cnst = LD_W5;

  375.     b51  = vec_madd(cnst, b51, x1);

  376.     cnst = LD_W6;

  377.     b31  = vec_madd(cnst, b31, x1);

  378.     cnst = LD_W7;

  379.     b11  = vec_madd(cnst, b11, x0);

  380. 

  381.     b71 = vec_add(b71, x2);

  382.     b51 = vec_add(b51, x3);

  383.     b31 = vec_add(b31, x2);

  384.     b11 = vec_add(b11, x3);

  385.     /* }}} */

  386. 

  387.     /* 8x8 matrix transpose (vector float[8][2]) {{{ */

  388.     x0 = vec_mergel(b00, b20);

  389.     x1 = vec_mergeh(b00, b20);

  390.     x2 = vec_mergel(b10, b30);

  391.     x3 = vec_mergeh(b10, b30);

  392. 

  393.     b00 = vec_mergeh(x1, x3);

  394.     b10 = vec_mergel(x1, x3);

  395.     b20 = vec_mergeh(x0, x2);

  396.     b30 = vec_mergel(x0, x2);

  397. 

  398.     x4 = vec_mergel(b41, b61);

  399.     x5 = vec_mergeh(b41, b61);

  400.     x6 = vec_mergel(b51, b71);

  401.     x7 = vec_mergeh(b51, b71);

  402. 

  403.     b41 = vec_mergeh(x5, x7);

  404.     b51 = vec_mergel(x5, x7);

  405.     b61 = vec_mergeh(x4, x6);

  406.     b71 = vec_mergel(x4, x6);

  407. 

  408.     x0 = vec_mergel(b01, b21);

  409.     x1 = vec_mergeh(b01, b21);

  410.     x2 = vec_mergel(b11, b31);

  411.     x3 = vec_mergeh(b11, b31);

  412. 

  413.     x4 = vec_mergel(b40, b60);

  414.     x5 = vec_mergeh(b40, b60);

  415.     x6 = vec_mergel(b50, b70);

  416.     x7 = vec_mergeh(b50, b70);

  417. 

  418.     b40 = vec_mergeh(x1, x3);

  419.     b50 = vec_mergel(x1, x3);

  420.     b60 = vec_mergeh(x0, x2);

  421.     b70 = vec_mergel(x0, x2);

  422. 

  423.     b01 = vec_mergeh(x5, x7);

  424.     b11 = vec_mergel(x5, x7);

  425.     b21 = vec_mergeh(x4, x6);

  426.     b31 = vec_mergel(x4, x6);

  427.     /* }}} */

  428. 

  429.     FDCTCOL(b00, b10, b20, b30, b40, b50, b60, b70);

  430.     FDCTCOL(b01, b11, b21, b31, b41, b51, b61, b71);

  431. 

  432.     /* round, convert back to short {{{ */

  433. #define CTS(n)                                                  \

  434.     b ## n ## 0 = vec_round(b ## n ## 0);                       \

  435.     b ## n ## 1 = vec_round(b ## n ## 1);                       \

  436.     b ## n ## 0 = ((vector float) vec_cts(b ## n ## 0, 0));     \

  437.     b ## n ## 1 = ((vector float) vec_cts(b ## n ## 1, 0));     \

  438.     b ## n ## 0 = ((vector float) vec_pack(vs32(b ## n ## 0),   \

  439.                                            vs32(b ## n ## 1))); \

  440.     vec_st(vs16(b ## n ## 0), 0, bp)

  441. 

  442.     bp = (vector signed short *) block;

  443.     CTS(0);

  444.     bp++;

  445.     CTS(1);

  446.     bp++;

  447.     CTS(2);

  448.     bp++;

  449.     CTS(3);

  450.     bp++;

  451.     CTS(4);

  452.     bp++;

  453.     CTS(5);

  454.     bp++;

  455.     CTS(6);

  456.     bp++;

  457.     CTS(7);

  458. 

  459. #undef CTS

  460.     /* }}} */

  461. }

  462. 

  463. #endif /* HAVE_ALTIVEC */

  464. 

  465. av_cold void ff_fdctdsp_init_ppc(FDCTDSPContext *c, AVCodecContext *avctx,

  466.                                  unsigned high_bit_depth)

  467. {

  468. #if HAVE_ALTIVEC

  469.     if (!PPC_ALTIVEC(av_get_cpu_flags()))

  470.         return;

  471. 

  472.     if (!high_bit_depth) {

  473.         if (avctx->dct_algo == FF_DCT_AUTO ||

  474.             avctx->dct_algo == FF_DCT_ALTIVEC) {

  475.             c->fdct = ff_fdct_altivec;

  476.         }

  477.     }

  478. #endif /* HAVE_ALTIVEC */

  479. }