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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 "libavutil/intreadwrite.h"

  30. #include "avcodec.h"

  31. #include "dsputil.h"

  32. #include "rnd_avg.h"

  33. #include "vp3dsp.h"

  34. 

  35. #define IdctAdjustBeforeShift 8

  36. #define xC1S7 64277

  37. #define xC2S6 60547

  38. #define xC3S5 54491

  39. #define xC4S4 46341

  40. #define xC5S3 36410

  41. #define xC6S2 25080

  42. #define xC7S1 12785

  43. 

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

  45. 

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

  47. {

  48.     int16_t *ip = input;

  49. 

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

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

  52. 

  53.     int i;

  54. 

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

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

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

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

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

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

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

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

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

  64. 

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

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

  67. 

  68.             Cd = A + C;

  69.             Dd = B + D;

  70. 

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

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

  73. 

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

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

  76. 

  77.             Ed = E - G;

  78.             Gd = E + G;

  79. 

  80.             Add = F + Ad;

  81.             Bdd = Bd - H;

  82. 

  83.             Fd = F - Ad;

  84.             Hd = Bd + H;

  85. 

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

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

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

  89. 

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

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

  92. 

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

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

  95. 

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

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

  98.         }

  99. 

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

  101.     }

  102. 

  103.     ip = input;

  104. 

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

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

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

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

  109. 

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

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

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

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

  114. 

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

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

  117. 

  118.             Cd = A + C;

  119.             Dd = B + D;

  120. 

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

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

  123. 

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

  125.                 E += 16*128;

  126.                 F += 16*128;

  127.             }

  128. 

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

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

  131. 

  132.             Ed = E - G;

  133.             Gd = E + G;

  134. 

  135.             Add = F + Ad;

  136.             Bdd = Bd - H;

  137. 

  138.             Fd = F - Ad;

  139.             Hd = Bd + H;

  140. 

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

  142.             if (type == 1) {

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

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

  145. 

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

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

  148. 

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

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

  151. 

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

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

  154.             }else{

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

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

  157. 

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

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

  160. 

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

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

  163. 

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

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

  166.             }

  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*/, int line_size,

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

  200. {

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

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

  203. }

  204. 

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

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

  207. {

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

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

  210. }

  211. 

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

  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 += line_size;

  227.     }

  228.     block[0] = 0;

  229. }

  230. 

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

  232.                                 int *bounding_values)

  233. {

  234.     unsigned char *end;

  235.     int filter_value;

  236.     const int nstride= -stride;

  237. 

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

  239.         filter_value =

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

  241.          +3*(first_pixel[0          ] - first_pixel[nstride]);

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

  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, int 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 =

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

  257.          +3*(first_pixel[ 0] - first_pixel[-1]);

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

  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_BFIN)

  294.         ff_vp3dsp_init_bfin(c, flags);

  295.     if (ARCH_PPC)

  296.         ff_vp3dsp_init_ppc(c, flags);

  297.     if (ARCH_X86)

  298.         ff_vp3dsp_init_x86(c, flags);

  299. }