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FFmpeg/libavcodec/rv40.c

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  1. /*

  2.  * RV40 decoder

  3.  * Copyright (c) 2007 Konstantin Shishkov

  4.  *

  5.  * This file is part of Libav.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. /**

  23.  * @file

  24.  * RV40 decoder

  25.  */

  26. 

  27. #include "libavutil/imgutils.h"

  28. 

  29. #include "avcodec.h"

  30. #include "mpegvideo.h"

  31. #include "golomb.h"

  32. 

  33. #include "rv34.h"

  34. #include "rv40vlc2.h"

  35. #include "rv40data.h"

  36. 

  37. static VLC aic_top_vlc;

  38. static VLC aic_mode1_vlc[AIC_MODE1_NUM], aic_mode2_vlc[AIC_MODE2_NUM];

  39. static VLC ptype_vlc[NUM_PTYPE_VLCS], btype_vlc[NUM_BTYPE_VLCS];

  40. 

  41. static const int16_t mode2_offs[] = {

  42.        0,  614, 1222, 1794, 2410,  3014,  3586,  4202,  4792, 5382, 5966, 6542,

  43.     7138, 7716, 8292, 8864, 9444, 10030, 10642, 11212, 11814

  44. };

  45. 

  46. /**

  47.  * Initialize all tables.

  48.  */

  49. static av_cold void rv40_init_tables(void)

  50. {

  51.     int i;

  52.     static VLC_TYPE aic_table[1 << AIC_TOP_BITS][2];

  53.     static VLC_TYPE aic_mode1_table[AIC_MODE1_NUM << AIC_MODE1_BITS][2];

  54.     static VLC_TYPE aic_mode2_table[11814][2];

  55.     static VLC_TYPE ptype_table[NUM_PTYPE_VLCS << PTYPE_VLC_BITS][2];

  56.     static VLC_TYPE btype_table[NUM_BTYPE_VLCS << BTYPE_VLC_BITS][2];

  57. 

  58.     aic_top_vlc.table = aic_table;

  59.     aic_top_vlc.table_allocated = 1 << AIC_TOP_BITS;

  60.     init_vlc(&aic_top_vlc, AIC_TOP_BITS, AIC_TOP_SIZE,

  61.              rv40_aic_top_vlc_bits,  1, 1,

  62.              rv40_aic_top_vlc_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);

  63.     for(i = 0; i < AIC_MODE1_NUM; i++){

  64.         // Every tenth VLC table is empty

  65.         if((i % 10) == 9) continue;

  66.         aic_mode1_vlc[i].table = &aic_mode1_table[i << AIC_MODE1_BITS];

  67.         aic_mode1_vlc[i].table_allocated = 1 << AIC_MODE1_BITS;

  68.         init_vlc(&aic_mode1_vlc[i], AIC_MODE1_BITS, AIC_MODE1_SIZE,

  69.                  aic_mode1_vlc_bits[i],  1, 1,

  70.                  aic_mode1_vlc_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);

  71.     }

  72.     for(i = 0; i < AIC_MODE2_NUM; i++){

  73.         aic_mode2_vlc[i].table = &aic_mode2_table[mode2_offs[i]];

  74.         aic_mode2_vlc[i].table_allocated = mode2_offs[i + 1] - mode2_offs[i];

  75.         init_vlc(&aic_mode2_vlc[i], AIC_MODE2_BITS, AIC_MODE2_SIZE,

  76.                  aic_mode2_vlc_bits[i],  1, 1,

  77.                  aic_mode2_vlc_codes[i], 2, 2, INIT_VLC_USE_NEW_STATIC);

  78.     }

  79.     for(i = 0; i < NUM_PTYPE_VLCS; i++){

  80.         ptype_vlc[i].table = &ptype_table[i << PTYPE_VLC_BITS];

  81.         ptype_vlc[i].table_allocated = 1 << PTYPE_VLC_BITS;

  82.         ff_init_vlc_sparse(&ptype_vlc[i], PTYPE_VLC_BITS, PTYPE_VLC_SIZE,

  83.                             ptype_vlc_bits[i],  1, 1,

  84.                             ptype_vlc_codes[i], 1, 1,

  85.                             ptype_vlc_syms,     1, 1, INIT_VLC_USE_NEW_STATIC);

  86.     }

  87.     for(i = 0; i < NUM_BTYPE_VLCS; i++){

  88.         btype_vlc[i].table = &btype_table[i << BTYPE_VLC_BITS];

  89.         btype_vlc[i].table_allocated = 1 << BTYPE_VLC_BITS;

  90.         ff_init_vlc_sparse(&btype_vlc[i], BTYPE_VLC_BITS, BTYPE_VLC_SIZE,

  91.                             btype_vlc_bits[i],  1, 1,

  92.                             btype_vlc_codes[i], 1, 1,

  93.                             btype_vlc_syms,     1, 1, INIT_VLC_USE_NEW_STATIC);

  94.     }

  95. }

  96. 

  97. /**

  98.  * Get stored dimension from bitstream.

  99.  *

  100.  * If the width/height is the standard one then it's coded as a 3-bit index.

  101.  * Otherwise it is coded as escaped 8-bit portions.

  102.  */

  103. static int get_dimension(GetBitContext *gb, const int *dim)

  104. {

  105.     int t   = get_bits(gb, 3);

  106.     int val = dim[t];

  107.     if(val < 0)

  108.         val = dim[get_bits1(gb) - val];

  109.     if(!val){

  110.         do{

  111.             t = get_bits(gb, 8);

  112.             val += t << 2;

  113.         }while(t == 0xFF);

  114.     }

  115.     return val;

  116. }

  117. 

  118. /**

  119.  * Get encoded picture size - usually this is called from rv40_parse_slice_header.

  120.  */

  121. static void rv40_parse_picture_size(GetBitContext *gb, int *w, int *h)

  122. {

  123.     *w = get_dimension(gb, rv40_standard_widths);

  124.     *h = get_dimension(gb, rv40_standard_heights);

  125. }

  126. 

  127. static int rv40_parse_slice_header(RV34DecContext *r, GetBitContext *gb, SliceInfo *si)

  128. {

  129.     int mb_bits;

  130.     int w = r->s.width, h = r->s.height;

  131.     int mb_size;

  132. 

  133.     memset(si, 0, sizeof(SliceInfo));

  134.     if(get_bits1(gb))

  135.         return -1;

  136.     si->type = get_bits(gb, 2);

  137.     if(si->type == 1) si->type = 0;

  138.     si->quant = get_bits(gb, 5);

  139.     if(get_bits(gb, 2))

  140.         return -1;

  141.     si->vlc_set = get_bits(gb, 2);

  142.     skip_bits1(gb);

  143.     si->pts = get_bits(gb, 13);

  144.     if(!si->type || !get_bits1(gb))

  145.         rv40_parse_picture_size(gb, &w, &h);

  146.     if(av_image_check_size(w, h, 0, r->s.avctx) < 0)

  147.         return -1;

  148.     si->width  = w;

  149.     si->height = h;

  150.     mb_size = ((w + 15) >> 4) * ((h + 15) >> 4);

  151.     mb_bits = ff_rv34_get_start_offset(gb, mb_size);

  152.     si->start = get_bits(gb, mb_bits);

  153. 

  154.     return 0;

  155. }

  156. 

  157. /**

  158.  * Decode 4x4 intra types array.

  159.  */

  160. static int rv40_decode_intra_types(RV34DecContext *r, GetBitContext *gb, int8_t *dst)

  161. {

  162.     MpegEncContext *s = &r->s;

  163.     int i, j, k, v;

  164.     int A, B, C;

  165.     int pattern;

  166.     int8_t *ptr;

  167. 

  168.     for(i = 0; i < 4; i++, dst += r->intra_types_stride){

  169.         if(!i && s->first_slice_line){

  170.             pattern = get_vlc2(gb, aic_top_vlc.table, AIC_TOP_BITS, 1);

  171.             dst[0] = (pattern >> 2) & 2;

  172.             dst[1] = (pattern >> 1) & 2;

  173.             dst[2] =  pattern       & 2;

  174.             dst[3] = (pattern << 1) & 2;

  175.             continue;

  176.         }

  177.         ptr = dst;

  178.         for(j = 0; j < 4; j++){

  179.             /* Coefficients are read using VLC chosen by the prediction pattern

  180.              * The first one (used for retrieving a pair of coefficients) is

  181.              * constructed from the top, top right and left coefficients

  182.              * The second one (used for retrieving only one coefficient) is

  183.              * top + 10 * left.

  184.              */

  185.             A = ptr[-r->intra_types_stride + 1]; // it won't be used for the last coefficient in a row

  186.             B = ptr[-r->intra_types_stride];

  187.             C = ptr[-1];

  188.             pattern = A + (B << 4) + (C << 8);

  189.             for(k = 0; k < MODE2_PATTERNS_NUM; k++)

  190.                 if(pattern == rv40_aic_table_index[k])

  191.                     break;

  192.             if(j < 3 && k < MODE2_PATTERNS_NUM){ //pattern is found, decoding 2 coefficients

  193.                 v = get_vlc2(gb, aic_mode2_vlc[k].table, AIC_MODE2_BITS, 2);

  194.                 *ptr++ = v/9;

  195.                 *ptr++ = v%9;

  196.                 j++;

  197.             }else{

  198.                 if(B != -1 && C != -1)

  199.                     v = get_vlc2(gb, aic_mode1_vlc[B + C*10].table, AIC_MODE1_BITS, 1);

  200.                 else{ // tricky decoding

  201.                     v = 0;

  202.                     switch(C){

  203.                     case -1: // code 0 -> 1, 1 -> 0

  204.                         if(B < 2)

  205.                             v = get_bits1(gb) ^ 1;

  206.                         break;

  207.                     case  0:

  208.                     case  2: // code 0 -> 2, 1 -> 0

  209.                         v = (get_bits1(gb) ^ 1) << 1;

  210.                         break;

  211.                     }

  212.                 }

  213.                 *ptr++ = v;

  214.             }

  215.         }

  216.     }

  217.     return 0;

  218. }

  219. 

  220. /**

  221.  * Decode macroblock information.

  222.  */

  223. static int rv40_decode_mb_info(RV34DecContext *r)

  224. {

  225.     MpegEncContext *s = &r->s;

  226.     GetBitContext *gb = &s->gb;

  227.     int q, i;

  228.     int prev_type = 0;

  229.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  230. 

  231.     if(!r->s.mb_skip_run)

  232.         r->s.mb_skip_run = svq3_get_ue_golomb(gb) + 1;

  233. 

  234.     if(--r->s.mb_skip_run)

  235.          return RV34_MB_SKIP;

  236. 

  237.     if(r->avail_cache[6-4]){

  238.         int blocks[RV34_MB_TYPES] = {0};

  239.         int count = 0;

  240.         if(r->avail_cache[6-1])

  241.             blocks[r->mb_type[mb_pos - 1]]++;

  242.         blocks[r->mb_type[mb_pos - s->mb_stride]]++;

  243.         if(r->avail_cache[6-2])

  244.             blocks[r->mb_type[mb_pos - s->mb_stride + 1]]++;

  245.         if(r->avail_cache[6-5])

  246.             blocks[r->mb_type[mb_pos - s->mb_stride - 1]]++;

  247.         for(i = 0; i < RV34_MB_TYPES; i++){

  248.             if(blocks[i] > count){

  249.                 count = blocks[i];

  250.                 prev_type = i;

  251.                 if(count>1)

  252.                     break;

  253.             }

  254.         }

  255.     } else if (r->avail_cache[6-1])

  256.         prev_type = r->mb_type[mb_pos - 1];

  257. 

  258.     if(s->pict_type == AV_PICTURE_TYPE_P){

  259.         prev_type = block_num_to_ptype_vlc_num[prev_type];

  260.         q = get_vlc2(gb, ptype_vlc[prev_type].table, PTYPE_VLC_BITS, 1);

  261.         if(q < PBTYPE_ESCAPE)

  262.             return q;

  263.         q = get_vlc2(gb, ptype_vlc[prev_type].table, PTYPE_VLC_BITS, 1);

  264.         av_log(s->avctx, AV_LOG_ERROR, "Dquant for P-frame\n");

  265.     }else{

  266.         prev_type = block_num_to_btype_vlc_num[prev_type];

  267.         q = get_vlc2(gb, btype_vlc[prev_type].table, BTYPE_VLC_BITS, 1);

  268.         if(q < PBTYPE_ESCAPE)

  269.             return q;

  270.         q = get_vlc2(gb, btype_vlc[prev_type].table, BTYPE_VLC_BITS, 1);

  271.         av_log(s->avctx, AV_LOG_ERROR, "Dquant for B-frame\n");

  272.     }

  273.     return 0;

  274. }

  275. 

  276. enum RV40BlockPos{

  277.     POS_CUR,

  278.     POS_TOP,

  279.     POS_LEFT,

  280.     POS_BOTTOM,

  281. };

  282. 

  283. #define MASK_CUR          0x0001

  284. #define MASK_RIGHT        0x0008

  285. #define MASK_BOTTOM       0x0010

  286. #define MASK_TOP          0x1000

  287. #define MASK_Y_TOP_ROW    0x000F

  288. #define MASK_Y_LAST_ROW   0xF000

  289. #define MASK_Y_LEFT_COL   0x1111

  290. #define MASK_Y_RIGHT_COL  0x8888

  291. #define MASK_C_TOP_ROW    0x0003

  292. #define MASK_C_LAST_ROW   0x000C

  293. #define MASK_C_LEFT_COL   0x0005

  294. #define MASK_C_RIGHT_COL  0x000A

  295. 

  296. static const int neighbour_offs_x[4] = { 0,  0, -1, 0 };

  297. static const int neighbour_offs_y[4] = { 0, -1,  0, 1 };

  298. 

  299. static void rv40_adaptive_loop_filter(RV34DSPContext *rdsp,

  300.                                       uint8_t *src, int stride, int dmode,

  301.                                       int lim_q1, int lim_p1,

  302.                                       int alpha, int beta, int beta2,

  303.                                       int chroma, int edge, int dir)

  304. {

  305.     int filter_p1, filter_q1;

  306.     int strong;

  307.     int lims;

  308. 

  309.     strong = rdsp->rv40_loop_filter_strength[dir](src, stride, beta, beta2,

  310.                                                   edge, &filter_p1, &filter_q1);

  311. 

  312.     lims = filter_p1 + filter_q1 + ((lim_q1 + lim_p1) >> 1) + 1;

  313. 

  314.     if (strong) {

  315.         rdsp->rv40_strong_loop_filter[dir](src, stride, alpha,

  316.                                            lims, dmode, chroma);

  317.     } else if (filter_p1 & filter_q1) {

  318.         rdsp->rv40_weak_loop_filter[dir](src, stride, 1, 1, alpha, beta,

  319.                                          lims, lim_q1, lim_p1);

  320.     } else if (filter_p1 | filter_q1) {

  321.         rdsp->rv40_weak_loop_filter[dir](src, stride, filter_p1, filter_q1,

  322.                                          alpha, beta, lims >> 1, lim_q1 >> 1,

  323.                                          lim_p1 >> 1);

  324.     }

  325. }

  326. 

  327. /**

  328.  * RV40 loop filtering function

  329.  */

  330. static void rv40_loop_filter(RV34DecContext *r, int row)

  331. {

  332.     MpegEncContext *s = &r->s;

  333.     int mb_pos, mb_x;

  334.     int i, j, k;

  335.     uint8_t *Y, *C;

  336.     int alpha, beta, betaY, betaC;

  337.     int q;

  338.     int mbtype[4];   ///< current macroblock and its neighbours types

  339.     /**

  340.      * flags indicating that macroblock can be filtered with strong filter

  341.      * it is set only for intra coded MB and MB with DCs coded separately

  342.      */

  343.     int mb_strong[4];

  344.     int clip[4];     ///< MB filter clipping value calculated from filtering strength

  345.     /**

  346.      * coded block patterns for luma part of current macroblock and its neighbours

  347.      * Format:

  348.      * LSB corresponds to the top left block,

  349.      * each nibble represents one row of subblocks.

  350.      */

  351.     int cbp[4];

  352.     /**

  353.      * coded block patterns for chroma part of current macroblock and its neighbours

  354.      * Format is the same as for luma with two subblocks in a row.

  355.      */

  356.     int uvcbp[4][2];

  357.     /**

  358.      * This mask represents the pattern of luma subblocks that should be filtered

  359.      * in addition to the coded ones because because they lie at the edge of

  360.      * 8x8 block with different enough motion vectors

  361.      */

  362.     unsigned mvmasks[4];

  363. 

  364.     mb_pos = row * s->mb_stride;

  365.     for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){

  366.         int mbtype = s->current_picture_ptr->mb_type[mb_pos];

  367.         if(IS_INTRA(mbtype) || IS_SEPARATE_DC(mbtype))

  368.             r->cbp_luma  [mb_pos] = r->deblock_coefs[mb_pos] = 0xFFFF;

  369.         if(IS_INTRA(mbtype))

  370.             r->cbp_chroma[mb_pos] = 0xFF;

  371.     }

  372.     mb_pos = row * s->mb_stride;

  373.     for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){

  374.         int y_h_deblock, y_v_deblock;

  375.         int c_v_deblock[2], c_h_deblock[2];

  376.         int clip_left;

  377.         int avail[4];

  378.         unsigned y_to_deblock;

  379.         int c_to_deblock[2];

  380. 

  381.         q = s->current_picture_ptr->qscale_table[mb_pos];

  382.         alpha = rv40_alpha_tab[q];

  383.         beta  = rv40_beta_tab [q];

  384.         betaY = betaC = beta * 3;

  385.         if(s->width * s->height <= 176*144)

  386.             betaY += beta;

  387. 

  388.         avail[0] = 1;

  389.         avail[1] = row;

  390.         avail[2] = mb_x;

  391.         avail[3] = row < s->mb_height - 1;

  392.         for(i = 0; i < 4; i++){

  393.             if(avail[i]){

  394.                 int pos = mb_pos + neighbour_offs_x[i] + neighbour_offs_y[i]*s->mb_stride;

  395.                 mvmasks[i] = r->deblock_coefs[pos];

  396.                 mbtype [i] = s->current_picture_ptr->mb_type[pos];

  397.                 cbp    [i] = r->cbp_luma[pos];

  398.                 uvcbp[i][0] = r->cbp_chroma[pos] & 0xF;

  399.                 uvcbp[i][1] = r->cbp_chroma[pos] >> 4;

  400.             }else{

  401.                 mvmasks[i] = 0;

  402.                 mbtype [i] = mbtype[0];

  403.                 cbp    [i] = 0;

  404.                 uvcbp[i][0] = uvcbp[i][1] = 0;

  405.             }

  406.             mb_strong[i] = IS_INTRA(mbtype[i]) || IS_SEPARATE_DC(mbtype[i]);

  407.             clip[i] = rv40_filter_clip_tbl[mb_strong[i] + 1][q];

  408.         }

  409.         y_to_deblock =  mvmasks[POS_CUR]

  410.                      | (mvmasks[POS_BOTTOM] << 16);

  411.         /* This pattern contains bits signalling that horizontal edges of

  412.          * the current block can be filtered.

  413.          * That happens when either of adjacent subblocks is coded or lies on

  414.          * the edge of 8x8 blocks with motion vectors differing by more than

  415.          * 3/4 pel in any component (any edge orientation for some reason).

  416.          */

  417.         y_h_deblock =   y_to_deblock

  418.                     | ((cbp[POS_CUR]                           <<  4) & ~MASK_Y_TOP_ROW)

  419.                     | ((cbp[POS_TOP]        & MASK_Y_LAST_ROW) >> 12);

  420.         /* This pattern contains bits signalling that vertical edges of

  421.          * the current block can be filtered.

  422.          * That happens when either of adjacent subblocks is coded or lies on

  423.          * the edge of 8x8 blocks with motion vectors differing by more than

  424.          * 3/4 pel in any component (any edge orientation for some reason).

  425.          */

  426.         y_v_deblock =   y_to_deblock

  427.                     | ((cbp[POS_CUR]                      << 1) & ~MASK_Y_LEFT_COL)

  428.                     | ((cbp[POS_LEFT] & MASK_Y_RIGHT_COL) >> 3);

  429.         if(!mb_x)

  430.             y_v_deblock &= ~MASK_Y_LEFT_COL;

  431.         if(!row)

  432.             y_h_deblock &= ~MASK_Y_TOP_ROW;

  433.         if(row == s->mb_height - 1 || (mb_strong[POS_CUR] | mb_strong[POS_BOTTOM]))

  434.             y_h_deblock &= ~(MASK_Y_TOP_ROW << 16);

  435.         /* Calculating chroma patterns is similar and easier since there is

  436.          * no motion vector pattern for them.

  437.          */

  438.         for(i = 0; i < 2; i++){

  439.             c_to_deblock[i] = (uvcbp[POS_BOTTOM][i] << 4) | uvcbp[POS_CUR][i];

  440.             c_v_deblock[i] =   c_to_deblock[i]

  441.                            | ((uvcbp[POS_CUR] [i]                       << 1) & ~MASK_C_LEFT_COL)

  442.                            | ((uvcbp[POS_LEFT][i]   & MASK_C_RIGHT_COL) >> 1);

  443.             c_h_deblock[i] =   c_to_deblock[i]

  444.                            | ((uvcbp[POS_TOP][i]    & MASK_C_LAST_ROW)  >> 2)

  445.                            |  (uvcbp[POS_CUR][i]                        << 2);

  446.             if(!mb_x)

  447.                 c_v_deblock[i] &= ~MASK_C_LEFT_COL;

  448.             if(!row)

  449.                 c_h_deblock[i] &= ~MASK_C_TOP_ROW;

  450.             if(row == s->mb_height - 1 || (mb_strong[POS_CUR] | mb_strong[POS_BOTTOM]))

  451.                 c_h_deblock[i] &= ~(MASK_C_TOP_ROW << 4);

  452.         }

  453. 

  454.         for(j = 0; j < 16; j += 4){

  455.             Y = s->current_picture_ptr->f.data[0] + mb_x*16 + (row*16 + j) * s->linesize;

  456.             for(i = 0; i < 4; i++, Y += 4){

  457.                 int ij = i + j;

  458.                 int clip_cur = y_to_deblock & (MASK_CUR << ij) ? clip[POS_CUR] : 0;

  459.                 int dither = j ? ij : i*4;

  460. 

  461.                 // if bottom block is coded then we can filter its top edge

  462.                 // (or bottom edge of this block, which is the same)

  463.                 if(y_h_deblock & (MASK_BOTTOM << ij)){

  464.                     rv40_adaptive_loop_filter(&r->rdsp, Y+4*s->linesize,

  465.                                               s->linesize, dither,

  466.                                               y_to_deblock & (MASK_BOTTOM << ij) ? clip[POS_CUR] : 0,

  467.                                               clip_cur, alpha, beta, betaY,

  468.                                               0, 0, 0);

  469.                 }

  470.                 // filter left block edge in ordinary mode (with low filtering strength)

  471.                 if(y_v_deblock & (MASK_CUR << ij) && (i || !(mb_strong[POS_CUR] | mb_strong[POS_LEFT]))){

  472.                     if(!i)

  473.                         clip_left = mvmasks[POS_LEFT] & (MASK_RIGHT << j) ? clip[POS_LEFT] : 0;

  474.                     else

  475.                         clip_left = y_to_deblock & (MASK_CUR << (ij-1)) ? clip[POS_CUR] : 0;

  476.                     rv40_adaptive_loop_filter(&r->rdsp, Y, s->linesize, dither,

  477.                                               clip_cur,

  478.                                               clip_left,

  479.                                               alpha, beta, betaY, 0, 0, 1);

  480.                 }

  481.                 // filter top edge of the current macroblock when filtering strength is high

  482.                 if(!j && y_h_deblock & (MASK_CUR << i) && (mb_strong[POS_CUR] | mb_strong[POS_TOP])){

  483.                     rv40_adaptive_loop_filter(&r->rdsp, Y, s->linesize, dither,

  484.                                        clip_cur,

  485.                                        mvmasks[POS_TOP] & (MASK_TOP << i) ? clip[POS_TOP] : 0,

  486.                                        alpha, beta, betaY, 0, 1, 0);

  487.                 }

  488.                 // filter left block edge in edge mode (with high filtering strength)

  489.                 if(y_v_deblock & (MASK_CUR << ij) && !i && (mb_strong[POS_CUR] | mb_strong[POS_LEFT])){

  490.                     clip_left = mvmasks[POS_LEFT] & (MASK_RIGHT << j) ? clip[POS_LEFT] : 0;

  491.                     rv40_adaptive_loop_filter(&r->rdsp, Y, s->linesize, dither,

  492.                                        clip_cur,

  493.                                        clip_left,

  494.                                        alpha, beta, betaY, 0, 1, 1);

  495.                 }

  496.             }

  497.         }

  498.         for(k = 0; k < 2; k++){

  499.             for(j = 0; j < 2; j++){

  500.                 C = s->current_picture_ptr->f.data[k + 1] + mb_x*8 + (row*8 + j*4) * s->uvlinesize;

  501.                 for(i = 0; i < 2; i++, C += 4){

  502.                     int ij = i + j*2;

  503.                     int clip_cur = c_to_deblock[k] & (MASK_CUR << ij) ? clip[POS_CUR] : 0;

  504.                     if(c_h_deblock[k] & (MASK_CUR << (ij+2))){

  505.                         int clip_bot = c_to_deblock[k] & (MASK_CUR << (ij+2)) ? clip[POS_CUR] : 0;

  506.                         rv40_adaptive_loop_filter(&r->rdsp, C+4*s->uvlinesize, s->uvlinesize, i*8,

  507.                                            clip_bot,

  508.                                            clip_cur,

  509.                                            alpha, beta, betaC, 1, 0, 0);

  510.                     }

  511.                     if((c_v_deblock[k] & (MASK_CUR << ij)) && (i || !(mb_strong[POS_CUR] | mb_strong[POS_LEFT]))){

  512.                         if(!i)

  513.                             clip_left = uvcbp[POS_LEFT][k] & (MASK_CUR << (2*j+1)) ? clip[POS_LEFT] : 0;

  514.                         else

  515.                             clip_left = c_to_deblock[k]    & (MASK_CUR << (ij-1))  ? clip[POS_CUR]  : 0;

  516.                         rv40_adaptive_loop_filter(&r->rdsp, C, s->uvlinesize, j*8,

  517.                                            clip_cur,

  518.                                            clip_left,

  519.                                            alpha, beta, betaC, 1, 0, 1);

  520.                     }

  521.                     if(!j && c_h_deblock[k] & (MASK_CUR << ij) && (mb_strong[POS_CUR] | mb_strong[POS_TOP])){

  522.                         int clip_top = uvcbp[POS_TOP][k] & (MASK_CUR << (ij+2)) ? clip[POS_TOP] : 0;

  523.                         rv40_adaptive_loop_filter(&r->rdsp, C, s->uvlinesize, i*8,

  524.                                            clip_cur,

  525.                                            clip_top,

  526.                                            alpha, beta, betaC, 1, 1, 0);

  527.                     }

  528.                     if(c_v_deblock[k] & (MASK_CUR << ij) && !i && (mb_strong[POS_CUR] | mb_strong[POS_LEFT])){

  529.                         clip_left = uvcbp[POS_LEFT][k] & (MASK_CUR << (2*j+1)) ? clip[POS_LEFT] : 0;

  530.                         rv40_adaptive_loop_filter(&r->rdsp, C, s->uvlinesize, j*8,

  531.                                            clip_cur,

  532.                                            clip_left,

  533.                                            alpha, beta, betaC, 1, 1, 1);

  534.                     }

  535.                 }

  536.             }

  537.         }

  538.     }

  539. }

  540. 

  541. /**

  542.  * Initialize decoder.

  543.  */

  544. static av_cold int rv40_decode_init(AVCodecContext *avctx)

  545. {

  546.     RV34DecContext *r = avctx->priv_data;

  547.     int ret;

  548. 

  549.     r->rv30 = 0;

  550.     if ((ret = ff_rv34_decode_init(avctx)) < 0)

  551.         return ret;

  552.     if(!aic_top_vlc.bits)

  553.         rv40_init_tables();

  554.     r->parse_slice_header = rv40_parse_slice_header;

  555.     r->decode_intra_types = rv40_decode_intra_types;

  556.     r->decode_mb_info     = rv40_decode_mb_info;

  557.     r->loop_filter        = rv40_loop_filter;

  558.     r->luma_dc_quant_i = rv40_luma_dc_quant[0];

  559.     r->luma_dc_quant_p = rv40_luma_dc_quant[1];

  560.     return 0;

  561. }

  562. 

  563. AVCodec ff_rv40_decoder = {

  564.     .name                  = "rv40",

  565.     .long_name             = NULL_IF_CONFIG_SMALL("RealVideo 4.0"),

  566.     .type                  = AVMEDIA_TYPE_VIDEO,

  567.     .id                    = AV_CODEC_ID_RV40,

  568.     .priv_data_size        = sizeof(RV34DecContext),

  569.     .init                  = rv40_decode_init,

  570.     .close                 = ff_rv34_decode_end,

  571.     .decode                = ff_rv34_decode_frame,

  572.     .capabilities          = CODEC_CAP_DR1 | CODEC_CAP_DELAY |

  573.                              CODEC_CAP_FRAME_THREADS,

  574.     .flush                 = ff_mpeg_flush,

  575.     .pix_fmts              = ff_pixfmt_list_420,

  576.     .init_thread_copy      = ONLY_IF_THREADS_ENABLED(ff_rv34_decode_init_thread_copy),

  577.     .update_thread_context = ONLY_IF_THREADS_ENABLED(ff_rv34_decode_update_thread_context),

  578. };