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FFmpeg/libavcodec/vp3dsp.c

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  1. /*

  2.  * Copyright (C) 2004 The FFmpeg project

  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. /**

  22.  * @file

  23.  * Standard C DSP-oriented functions cribbed from the original VP3

  24.  * source code.

  25.  */

  26. 

  27. #include "libavutil/attributes.h"

  28. #include "libavutil/intreadwrite.h"

  29. #include "libavutil/common.h"

  30. #include "libavutil/intreadwrite.h"

  31. 

  32. #include "avcodec.h"

  33. #include "rnd_avg.h"

  34. #include "vp3dsp.h"

  35. 

  36. #define IdctAdjustBeforeShift 8

  37. #define xC1S7 64277

  38. #define xC2S6 60547

  39. #define xC3S5 54491

  40. #define xC4S4 46341

  41. #define xC5S3 36410

  42. #define xC6S2 25080

  43. #define xC7S1 12785

  44. 

  45. #define M(a, b) (((a) * (b)) >> 16)

  46. 

  47. static av_always_inline void idct(uint8_t *dst, ptrdiff_t stride,

  48.                                   int16_t *input, int type)

  49. {

  50.     int16_t *ip = input;

  51. 

  52.     int A, B, C, D, Ad, Bd, Cd, Dd, E, F, G, H;

  53.     int Ed, Gd, Add, Bdd, Fd, Hd;

  54. 

  55.     int i;

  56. 

  57.     /* Inverse DCT on the rows now */

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

  59.         /* Check for non-zero values */

  60.         if (ip[0 * 8] | ip[1 * 8] | ip[2 * 8] | ip[3 * 8] |

  61.             ip[4 * 8] | ip[5 * 8] | ip[6 * 8] | ip[7 * 8]) {

  62.             A = M(xC1S7, ip[1 * 8]) + M(xC7S1, ip[7 * 8]);

  63.             B = M(xC7S1, ip[1 * 8]) - M(xC1S7, ip[7 * 8]);

  64.             C = M(xC3S5, ip[3 * 8]) + M(xC5S3, ip[5 * 8]);

  65.             D = M(xC3S5, ip[5 * 8]) - M(xC5S3, ip[3 * 8]);

  66. 

  67.             Ad = M(xC4S4, (A - C));

  68.             Bd = M(xC4S4, (B - D));

  69. 

  70.             Cd = A + C;

  71.             Dd = B + D;

  72. 

  73.             E = M(xC4S4, (ip[0 * 8] + ip[4 * 8]));

  74.             F = M(xC4S4, (ip[0 * 8] - ip[4 * 8]));

  75. 

  76.             G = M(xC2S6, ip[2 * 8]) + M(xC6S2, ip[6 * 8]);

  77.             H = M(xC6S2, ip[2 * 8]) - M(xC2S6, ip[6 * 8]);

  78. 

  79.             Ed = E - G;

  80.             Gd = E + G;

  81. 

  82.             Add = F + Ad;

  83.             Bdd = Bd - H;

  84. 

  85.             Fd = F - Ad;

  86.             Hd = Bd + H;

  87. 

  88.             /*  Final sequence of operations over-write original inputs. */

  89.             ip[0 * 8] = Gd + Cd;

  90.             ip[7 * 8] = Gd - Cd;

  91. 

  92.             ip[1 * 8] = Add + Hd;

  93.             ip[2 * 8] = Add - Hd;

  94. 

  95.             ip[3 * 8] = Ed + Dd;

  96.             ip[4 * 8] = Ed - Dd;

  97. 

  98.             ip[5 * 8] = Fd + Bdd;

  99.             ip[6 * 8] = Fd - Bdd;

  100.         }

  101. 

  102.         ip += 1;            /* next row */

  103.     }

  104. 

  105.     ip = input;

  106. 

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

  108.         /* Check for non-zero values (bitwise or faster than ||) */

  109.         if (ip[1] | ip[2] | ip[3] |

  110.             ip[4] | ip[5] | ip[6] | ip[7]) {

  111.             A = M(xC1S7, ip[1]) + M(xC7S1, ip[7]);

  112.             B = M(xC7S1, ip[1]) - M(xC1S7, ip[7]);

  113.             C = M(xC3S5, ip[3]) + M(xC5S3, ip[5]);

  114.             D = M(xC3S5, ip[5]) - M(xC5S3, ip[3]);

  115. 

  116.             Ad = M(xC4S4, (A - C));

  117.             Bd = M(xC4S4, (B - D));

  118. 

  119.             Cd = A + C;

  120.             Dd = B + D;

  121. 

  122.             E = M(xC4S4, (ip[0] + ip[4])) + 8;

  123.             F = M(xC4S4, (ip[0] - ip[4])) + 8;

  124. 

  125.             if (type == 1) { // HACK

  126.                 E += 16 * 128;

  127.                 F += 16 * 128;

  128.             }

  129. 

  130.             G = M(xC2S6, ip[2]) + M(xC6S2, ip[6]);

  131.             H = M(xC6S2, ip[2]) - M(xC2S6, ip[6]);

  132. 

  133.             Ed = E - G;

  134.             Gd = E + G;

  135. 

  136.             Add = F + Ad;

  137.             Bdd = Bd - H;

  138. 

  139.             Fd = F - Ad;

  140.             Hd = Bd + H;

  141. 

  142.             /* Final sequence of operations over-write original inputs. */

  143.             if (type == 1) {

  144.                 dst[0 * stride] = av_clip_uint8((Gd + Cd) >> 4);

  145.                 dst[7 * stride] = av_clip_uint8((Gd - Cd) >> 4);

  146. 

  147.                 dst[1 * stride] = av_clip_uint8((Add + Hd) >> 4);

  148.                 dst[2 * stride] = av_clip_uint8((Add - Hd) >> 4);

  149. 

  150.                 dst[3 * stride] = av_clip_uint8((Ed + Dd) >> 4);

  151.                 dst[4 * stride] = av_clip_uint8((Ed - Dd) >> 4);

  152. 

  153.                 dst[5 * stride] = av_clip_uint8((Fd + Bdd) >> 4);

  154.                 dst[6 * stride] = av_clip_uint8((Fd - Bdd) >> 4);

  155.             } else {

  156.                 dst[0 * stride] = av_clip_uint8(dst[0 * stride] + ((Gd + Cd) >> 4));

  157.                 dst[7 * stride] = av_clip_uint8(dst[7 * stride] + ((Gd - Cd) >> 4));

  158. 

  159.                 dst[1 * stride] = av_clip_uint8(dst[1 * stride] + ((Add + Hd) >> 4));

  160.                 dst[2 * stride] = av_clip_uint8(dst[2 * stride] + ((Add - Hd) >> 4));

  161. 

  162.                 dst[3 * stride] = av_clip_uint8(dst[3 * stride] + ((Ed + Dd) >> 4));

  163.                 dst[4 * stride] = av_clip_uint8(dst[4 * stride] + ((Ed - Dd) >> 4));

  164. 

  165.                 dst[5 * stride] = av_clip_uint8(dst[5 * stride] + ((Fd + Bdd) >> 4));

  166.                 dst[6 * stride] = av_clip_uint8(dst[6 * stride] + ((Fd - Bdd) >> 4));

  167.             }

  168.         } else {

  169.             if (type == 1) {

  170.                 dst[0*stride] =

  171.                 dst[1*stride] =

  172.                 dst[2*stride] =

  173.                 dst[3*stride] =

  174.                 dst[4*stride] =

  175.                 dst[5*stride] =

  176.                 dst[6*stride] =

  177.                 dst[7*stride] = av_clip_uint8(128 + ((xC4S4 * ip[0] + (IdctAdjustBeforeShift << 16)) >> 20));

  178.             } else {

  179.                 if (ip[0]) {

  180.                     int v = (xC4S4 * ip[0] + (IdctAdjustBeforeShift << 16)) >> 20;

  181.                     dst[0 * stride] = av_clip_uint8(dst[0 * stride] + v);

  182.                     dst[1 * stride] = av_clip_uint8(dst[1 * stride] + v);

  183.                     dst[2 * stride] = av_clip_uint8(dst[2 * stride] + v);

  184.                     dst[3 * stride] = av_clip_uint8(dst[3 * stride] + v);

  185.                     dst[4 * stride] = av_clip_uint8(dst[4 * stride] + v);

  186.                     dst[5 * stride] = av_clip_uint8(dst[5 * stride] + v);

  187.                     dst[6 * stride] = av_clip_uint8(dst[6 * stride] + v);

  188.                     dst[7 * stride] = av_clip_uint8(dst[7 * stride] + v);

  189.                 }

  190.             }

  191.         }

  192. 

  193.         ip += 8;            /* next column */

  194.         dst++;

  195.     }

  196. }

  197. 

  198. static void vp3_idct_put_c(uint8_t *dest /* align 8 */, ptrdiff_t stride,

  199.                            int16_t *block /* align 16 */)

  200. {

  201.     idct(dest, stride, block, 1);

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

  203. }

  204. 

  205. static void vp3_idct_add_c(uint8_t *dest /* align 8 */, ptrdiff_t stride,

  206.                            int16_t *block /* align 16 */)

  207. {

  208.     idct(dest, stride, block, 2);

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

  210. }

  211. 

  212. static void vp3_idct_dc_add_c(uint8_t *dest /* align 8 */, ptrdiff_t stride,

  213.                               int16_t *block /* align 16 */)

  214. {

  215.     int i, dc = (block[0] + 15) >> 5;

  216. 

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

  218.         dest[0] = av_clip_uint8(dest[0] + dc);

  219.         dest[1] = av_clip_uint8(dest[1] + dc);

  220.         dest[2] = av_clip_uint8(dest[2] + dc);

  221.         dest[3] = av_clip_uint8(dest[3] + dc);

  222.         dest[4] = av_clip_uint8(dest[4] + dc);

  223.         dest[5] = av_clip_uint8(dest[5] + dc);

  224.         dest[6] = av_clip_uint8(dest[6] + dc);

  225.         dest[7] = av_clip_uint8(dest[7] + dc);

  226.         dest   += stride;

  227.     }

  228.     block[0] = 0;

  229. }

  230. 

  231. static void vp3_v_loop_filter_c(uint8_t *first_pixel, ptrdiff_t stride,

  232.                                 int *bounding_values)

  233. {

  234.     unsigned char *end;

  235.     int filter_value;

  236.     const ptrdiff_t nstride = -stride;

  237. 

  238.     for (end = first_pixel + 8; first_pixel < end; first_pixel++) {

  239.         filter_value = (first_pixel[2 * nstride] - first_pixel[stride]) +

  240.                        (first_pixel[0] - first_pixel[nstride]) * 3;

  241.         filter_value = bounding_values[(filter_value + 4) >> 3];

  242. 

  243.         first_pixel[nstride] = av_clip_uint8(first_pixel[nstride] + filter_value);

  244.         first_pixel[0]       = av_clip_uint8(first_pixel[0] - filter_value);

  245.     }

  246. }

  247. 

  248. static void vp3_h_loop_filter_c(uint8_t *first_pixel, ptrdiff_t stride,

  249.                                 int *bounding_values)

  250. {

  251.     unsigned char *end;

  252.     int filter_value;

  253. 

  254.     for (end = first_pixel + 8 * stride; first_pixel != end; first_pixel += stride) {

  255.         filter_value = (first_pixel[-2] - first_pixel[1]) +

  256.                        (first_pixel[ 0] - first_pixel[-1]) * 3;

  257.         filter_value = bounding_values[(filter_value + 4) >> 3];

  258. 

  259.         first_pixel[-1] = av_clip_uint8(first_pixel[-1] + filter_value);

  260.         first_pixel[ 0] = av_clip_uint8(first_pixel[ 0] - filter_value);

  261.     }

  262. }

  263. 

  264. static void put_no_rnd_pixels_l2(uint8_t *dst, const uint8_t *src1,

  265.                                  const uint8_t *src2, ptrdiff_t stride, int h)

  266. {

  267.     int i;

  268. 

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

  270.         uint32_t a, b;

  271. 

  272.         a = AV_RN32(&src1[i * stride]);

  273.         b = AV_RN32(&src2[i * stride]);

  274.         AV_WN32A(&dst[i * stride], no_rnd_avg32(a, b));

  275.         a = AV_RN32(&src1[i * stride + 4]);

  276.         b = AV_RN32(&src2[i * stride + 4]);

  277.         AV_WN32A(&dst[i * stride + 4], no_rnd_avg32(a, b));

  278.     }

  279. }

  280. 

  281. av_cold void ff_vp3dsp_init(VP3DSPContext *c, int flags)

  282. {

  283.     c->put_no_rnd_pixels_l2 = put_no_rnd_pixels_l2;

  284. 

  285.     c->idct_put      = vp3_idct_put_c;

  286.     c->idct_add      = vp3_idct_add_c;

  287.     c->idct_dc_add   = vp3_idct_dc_add_c;

  288.     c->v_loop_filter = vp3_v_loop_filter_c;

  289.     c->h_loop_filter = vp3_h_loop_filter_c;

  290. 

  291.     if (ARCH_ARM)

  292.         ff_vp3dsp_init_arm(c, flags);

  293.     if (ARCH_PPC)

  294.         ff_vp3dsp_init_ppc(c, flags);

  295.     if (ARCH_X86)

  296.         ff_vp3dsp_init_x86(c, flags);

  297. }