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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/common.h"

  29. #include "avcodec.h"

  30. #include "dsputil.h"

  31. #include "rnd_avg.h"

  32. #include "vp3dsp.h"

  33. 

  34. #define IdctAdjustBeforeShift 8

  35. #define xC1S7 64277

  36. #define xC2S6 60547

  37. #define xC3S5 54491

  38. #define xC4S4 46341

  39. #define xC5S3 36410

  40. #define xC6S2 25080

  41. #define xC7S1 12785

  42. 

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

  44. 

  45. static av_always_inline void idct(uint8_t *dst, int stride, int16_t *input, int type)

  46. {

  47.     int16_t *ip = input;

  48. 

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

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

  51. 

  52.     int i;

  53. 

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

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

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

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

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

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

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

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

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

  63. 

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

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

  66. 

  67.             Cd = A + C;

  68.             Dd = B + D;

  69. 

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

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

  72. 

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

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

  75. 

  76.             Ed = E - G;

  77.             Gd = E + G;

  78. 

  79.             Add = F + Ad;

  80.             Bdd = Bd - H;

  81. 

  82.             Fd = F - Ad;

  83.             Hd = Bd + H;

  84. 

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

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

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

  88. 

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

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

  91. 

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

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

  94. 

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

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

  97.         }

  98. 

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

  100.     }

  101. 

  102.     ip = input;

  103. 

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

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

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

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

  108. 

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

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

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

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

  113. 

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

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

  116. 

  117.             Cd = A + C;

  118.             Dd = B + D;

  119. 

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

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

  122. 

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

  124.                 E += 16*128;

  125.                 F += 16*128;

  126.             }

  127. 

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

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

  130. 

  131.             Ed = E - G;

  132.             Gd = E + G;

  133. 

  134.             Add = F + Ad;

  135.             Bdd = Bd - H;

  136. 

  137.             Fd = F - Ad;

  138.             Hd = Bd + H;

  139. 

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

  141.             if (type == 1) {

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

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

  144. 

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

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

  147. 

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

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

  150. 

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

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

  153.             }else{

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

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

  156. 

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

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

  159. 

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

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

  162. 

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

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

  165.             }

  166. 

  167.         } else {

  168.             if (type == 1) {

  169.                 dst[0*stride]=

  170.                 dst[1*stride]=

  171.                 dst[2*stride]=

  172.                 dst[3*stride]=

  173.                 dst[4*stride]=

  174.                 dst[5*stride]=

  175.                 dst[6*stride]=

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

  177.             }else{

  178.                 if(ip[0]){

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

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

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

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

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

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

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

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

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

  188.                 }

  189.             }

  190.         }

  191. 

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

  193.         dst++;

  194.     }

  195. }

  196. 

  197. static void vp3_idct_put_c(uint8_t *dest/*align 8*/, int line_size,

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

  199. {

  200.     idct(dest, line_size, block, 1);

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

  202. }

  203. 

  204. static void vp3_idct_add_c(uint8_t *dest/*align 8*/, int line_size,

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

  206. {

  207.     idct(dest, line_size, block, 2);

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

  209. }

  210. 

  211. static void vp3_idct_dc_add_c(uint8_t *dest/*align 8*/, int line_size,

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

  213. {

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

  215. 

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

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

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

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

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

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

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

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

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

  225.         dest += line_size;

  226.     }

  227.     block[0] = 0;

  228. }

  229. 

  230. static void vp3_v_loop_filter_c(uint8_t *first_pixel, int stride,

  231.                                 int *bounding_values)

  232. {

  233.     unsigned char *end;

  234.     int filter_value;

  235.     const int nstride= -stride;

  236. 

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

  238.         filter_value =

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

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

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

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

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

  244.     }

  245. }

  246. 

  247. static void vp3_h_loop_filter_c(uint8_t *first_pixel, int stride,

  248.                                 int *bounding_values)

  249. {

  250.     unsigned char *end;

  251.     int filter_value;

  252. 

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

  254.         filter_value =

  255.             (first_pixel[-2] - first_pixel[ 1])

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

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

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

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

  260.     }

  261. }

  262. 

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

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

  265. {

  266.     int i;

  267. 

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

  269.         uint32_t a, b;

  270. 

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

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

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

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

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

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

  277.     }

  278. }

  279. 

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

  281. {

  282.     c->put_no_rnd_pixels_l2 = put_no_rnd_pixels_l2;

  283. 

  284.     c->idct_put      = vp3_idct_put_c;

  285.     c->idct_add      = vp3_idct_add_c;

  286.     c->idct_dc_add   = vp3_idct_dc_add_c;

  287.     c->v_loop_filter = vp3_v_loop_filter_c;

  288.     c->h_loop_filter = vp3_h_loop_filter_c;

  289. 

  290.     if (ARCH_ARM)

  291.         ff_vp3dsp_init_arm(c, flags);

  292.     if (ARCH_BFIN)

  293.         ff_vp3dsp_init_bfin(c, flags);

  294.     if (ARCH_PPC)

  295.         ff_vp3dsp_init_ppc(c, flags);

  296.     if (ARCH_X86)

  297.         ff_vp3dsp_init_x86(c, flags);

  298. }