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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 "golomb_legacy.h"

  31. #include "mpegutils.h"

  32. #include "mpegvideo.h"

  33. 

  34. #include "rv34.h"

  35. #include "rv40vlc2.h"

  36. #include "rv40data.h"

  37. 

  38. static VLC aic_top_vlc;

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

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

  41. 

  42. static const int16_t mode2_offs[] = {

  43.        0,  614, 1222, 1794, 2410,  3014,  3586,  4202,  4792, 5382, 5966, 6542,

  44.     7138, 7716, 8292, 8864, 9444, 10030, 10642, 11212, 11814

  45. };

  46. 

  47. /**

  48.  * Initialize all tables.

  49.  */

  50. static av_cold void rv40_init_tables(void)

  51. {

  52.     int i;

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

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

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

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

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

  58. 

  59.     aic_top_vlc.table = aic_table;

  60.     aic_top_vlc.table_allocated = 1 << AIC_TOP_BITS;

  61.     init_vlc(&aic_top_vlc, AIC_TOP_BITS, AIC_TOP_SIZE,

  62.              rv40_aic_top_vlc_bits,  1, 1,

  63.              rv40_aic_top_vlc_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);

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

  65.         // Every tenth VLC table is empty

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

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

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

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

  70.                  aic_mode1_vlc_bits[i],  1, 1,

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

  72.     }

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

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

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

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

  77.                  aic_mode2_vlc_bits[i],  1, 1,

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

  79.     }

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

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

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

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

  84.                             ptype_vlc_bits[i],  1, 1,

  85.                             ptype_vlc_codes[i], 1, 1,

  86.                             ptype_vlc_syms,     1, 1, INIT_VLC_USE_NEW_STATIC);

  87.     }

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

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

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

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

  92.                             btype_vlc_bits[i],  1, 1,

  93.                             btype_vlc_codes[i], 1, 1,

  94.                             btype_vlc_syms,     1, 1, INIT_VLC_USE_NEW_STATIC);

  95.     }

  96. }

  97. 

  98. /**

  99.  * Get stored dimension from bitstream.

  100.  *

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

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

  103.  */

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

  105. {

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

  107.     int val = dim[t];

  108.     if(val < 0)

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

  110.     if(!val){

  111.         do{

  112.             t = get_bits(gb, 8);

  113.             val += t << 2;

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

  115.     }

  116.     return val;

  117. }

  118. 

  119. /**

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

  121.  */

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

  123. {

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

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

  126. }

  127. 

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

  129. {

  130.     int mb_bits;

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

  132.     int mb_size;

  133.     int ret;

  134. 

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

  136.     if(get_bits1(gb))

  137.         return AVERROR_INVALIDDATA;

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

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

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

  141.     if(get_bits(gb, 2))

  142.         return AVERROR_INVALIDDATA;

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

  144.     skip_bits1(gb);

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

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

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

  148.     if ((ret = av_image_check_size(w, h, 0, r->s.avctx)) < 0)

  149.         return ret;

  150.     si->width  = w;

  151.     si->height = h;

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

  153.     mb_bits = ff_rv34_get_start_offset(gb, mb_size);

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

  155. 

  156.     return 0;

  157. }

  158. 

  159. /**

  160.  * Decode 4x4 intra types array.

  161.  */

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

  163. {

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

  165.     int i, j, k, v;

  166.     int A, B, C;

  167.     int pattern;

  168.     int8_t *ptr;

  169. 

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

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

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

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

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

  175.             dst[2] =  pattern       & 2;

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

  177.             continue;

  178.         }

  179.         ptr = dst;

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

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

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

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

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

  185.              * top + 10 * left.

  186.              */

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

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

  189.             C = ptr[-1];

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

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

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

  193.                     break;

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

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

  196.                 *ptr++ = v/9;

  197.                 *ptr++ = v%9;

  198.                 j++;

  199.             }else{

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

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

  202.                 else{ // tricky decoding

  203.                     v = 0;

  204.                     switch(C){

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

  206.                         if(B < 2)

  207.                             v = get_bits1(gb) ^ 1;

  208.                         break;

  209.                     case  0:

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

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

  212.                         break;

  213.                     }

  214.                 }

  215.                 *ptr++ = v;

  216.             }

  217.         }

  218.     }

  219.     return 0;

  220. }

  221. 

  222. /**

  223.  * Decode macroblock information.

  224.  */

  225. static int rv40_decode_mb_info(RV34DecContext *r)

  226. {

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

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

  229.     int q, i;

  230.     int prev_type = 0;

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

  232. 

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

  234.         r->s.mb_skip_run = get_interleaved_ue_golomb(gb) + 1;

  235. 

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

  237.          return RV34_MB_SKIP;

  238. 

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

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

  241.         int count = 0;

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

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

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

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

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

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

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

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

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

  251.                 count = blocks[i];

  252.                 prev_type = i;

  253.                 if(count>1)

  254.                     break;

  255.             }

  256.         }

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

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

  259. 

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

  261.         prev_type = block_num_to_ptype_vlc_num[prev_type];

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

  263.         if(q < PBTYPE_ESCAPE)

  264.             return q;

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

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

  267.     }else{

  268.         prev_type = block_num_to_btype_vlc_num[prev_type];

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

  270.         if(q < PBTYPE_ESCAPE)

  271.             return q;

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

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

  274.     }

  275.     return 0;

  276. }

  277. 

  278. enum RV40BlockPos{

  279.     POS_CUR,

  280.     POS_TOP,

  281.     POS_LEFT,

  282.     POS_BOTTOM,

  283. };

  284. 

  285. #define MASK_CUR          0x0001

  286. #define MASK_RIGHT        0x0008

  287. #define MASK_BOTTOM       0x0010

  288. #define MASK_TOP          0x1000

  289. #define MASK_Y_TOP_ROW    0x000F

  290. #define MASK_Y_LAST_ROW   0xF000

  291. #define MASK_Y_LEFT_COL   0x1111

  292. #define MASK_Y_RIGHT_COL  0x8888

  293. #define MASK_C_TOP_ROW    0x0003

  294. #define MASK_C_LAST_ROW   0x000C

  295. #define MASK_C_LEFT_COL   0x0005

  296. #define MASK_C_RIGHT_COL  0x000A

  297. 

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

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

  300. 

  301. static void rv40_adaptive_loop_filter(RV34DSPContext *rdsp,

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

  303.                                       int lim_q1, int lim_p1,

  304.                                       int alpha, int beta, int beta2,

  305.                                       int chroma, int edge, int dir)

  306. {

  307.     int filter_p1, filter_q1;

  308.     int strong;

  309.     int lims;

  310. 

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

  312.                                                   edge, &filter_p1, &filter_q1);

  313. 

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

  315. 

  316.     if (strong) {

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

  318.                                            lims, dmode, chroma);

  319.     } else if (filter_p1 & filter_q1) {

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

  321.                                          lims, lim_q1, lim_p1);

  322.     } else if (filter_p1 | filter_q1) {

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

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

  325.                                          lim_p1 >> 1);

  326.     }

  327. }

  328. 

  329. /**

  330.  * RV40 loop filtering function

  331.  */

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

  333. {

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

  335.     int mb_pos, mb_x;

  336.     int i, j, k;

  337.     uint8_t *Y, *C;

  338.     int alpha, beta, betaY, betaC;

  339.     int q;

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

  341.     /**

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

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

  344.      */

  345.     int mb_strong[4];

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

  347.     /**

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

  349.      * Format:

  350.      * LSB corresponds to the top left block,

  351.      * each nibble represents one row of subblocks.

  352.      */

  353.     int cbp[4];

  354.     /**

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

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

  357.      */

  358.     int uvcbp[4][2];

  359.     /**

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

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

  362.      * 8x8 block with different enough motion vectors

  363.      */

  364.     unsigned mvmasks[4];

  365. 

  366.     mb_pos = row * s->mb_stride;

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

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

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

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

  371.         if(IS_INTRA(mbtype))

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

  373.     }

  374.     mb_pos = row * s->mb_stride;

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

  376.         int y_h_deblock, y_v_deblock;

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

  378.         int clip_left;

  379.         int avail[4];

  380.         unsigned y_to_deblock;

  381.         int c_to_deblock[2];

  382. 

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

  384.         alpha = rv40_alpha_tab[q];

  385.         beta  = rv40_beta_tab [q];

  386.         betaY = betaC = beta * 3;

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

  388.             betaY += beta;

  389. 

  390.         avail[0] = 1;

  391.         avail[1] = row;

  392.         avail[2] = mb_x;

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

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

  395.             if(avail[i]){

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

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

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

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

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

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

  402.             }else{

  403.                 mvmasks[i] = 0;

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

  405.                 cbp    [i] = 0;

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

  407.             }

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

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

  410.         }

  411.         y_to_deblock =  mvmasks[POS_CUR]

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

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

  414.          * the current block can be filtered.

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

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

  417.          * 3/4 pel in any component (any edge orientation for some reason).

  418.          */

  419.         y_h_deblock =   y_to_deblock

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

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

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

  423.          * the current block can be filtered.

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

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

  426.          * 3/4 pel in any component (any edge orientation for some reason).

  427.          */

  428.         y_v_deblock =   y_to_deblock

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

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

  431.         if(!mb_x)

  432.             y_v_deblock &= ~MASK_Y_LEFT_COL;

  433.         if(!row)

  434.             y_h_deblock &= ~MASK_Y_TOP_ROW;

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

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

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

  438.          * no motion vector pattern for them.

  439.          */

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

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

  442.             c_v_deblock[i] =   c_to_deblock[i]

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

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

  445.             c_h_deblock[i] =   c_to_deblock[i]

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

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

  448.             if(!mb_x)

  449.                 c_v_deblock[i] &= ~MASK_C_LEFT_COL;

  450.             if(!row)

  451.                 c_h_deblock[i] &= ~MASK_C_TOP_ROW;

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

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

  454.         }

  455. 

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

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

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

  459.                 int ij = i + j;

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

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

  462. 

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

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

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

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

  467.                                               s->linesize, dither,

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

  469.                                               clip_cur, alpha, beta, betaY,

  470.                                               0, 0, 0);

  471.                 }

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

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

  474.                     if(!i)

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

  476.                     else

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

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

  479.                                               clip_cur,

  480.                                               clip_left,

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

  482.                 }

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

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

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

  486.                                        clip_cur,

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

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

  489.                 }

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

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

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

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

  494.                                        clip_cur,

  495.                                        clip_left,

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

  497.                 }

  498.             }

  499.         }

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

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

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

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

  504.                     int ij = i + j*2;

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

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

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

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

  509.                                            clip_bot,

  510.                                            clip_cur,

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

  512.                     }

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

  514.                         if(!i)

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

  516.                         else

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

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

  519.                                            clip_cur,

  520.                                            clip_left,

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

  522.                     }

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

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

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

  526.                                            clip_cur,

  527.                                            clip_top,

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

  529.                     }

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

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

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

  533.                                            clip_cur,

  534.                                            clip_left,

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

  536.                     }

  537.                 }

  538.             }

  539.         }

  540.     }

  541. }

  542. 

  543. /**

  544.  * Initialize decoder.

  545.  */

  546. static av_cold int rv40_decode_init(AVCodecContext *avctx)

  547. {

  548.     RV34DecContext *r = avctx->priv_data;

  549.     int ret;

  550. 

  551.     r->rv30 = 0;

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

  553.         return ret;

  554.     if(!aic_top_vlc.bits)

  555.         rv40_init_tables();

  556.     r->parse_slice_header = rv40_parse_slice_header;

  557.     r->decode_intra_types = rv40_decode_intra_types;

  558.     r->decode_mb_info     = rv40_decode_mb_info;

  559.     r->loop_filter        = rv40_loop_filter;

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

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

  562.     return 0;

  563. }

  564. 

  565. AVCodec ff_rv40_decoder = {

  566.     .name                  = "rv40",

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

  568.     .type                  = AVMEDIA_TYPE_VIDEO,

  569.     .id                    = AV_CODEC_ID_RV40,

  570.     .priv_data_size        = sizeof(RV34DecContext),

  571.     .init                  = rv40_decode_init,

  572.     .close                 = ff_rv34_decode_end,

  573.     .decode                = ff_rv34_decode_frame,

  574.     .capabilities          = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY |

  575.                              AV_CODEC_CAP_FRAME_THREADS,

  576.     .flush                 = ff_mpeg_flush,

  577.     .pix_fmts              = (const enum AVPixelFormat[]) {

  578.         AV_PIX_FMT_YUV420P,

  579.         AV_PIX_FMT_NONE

  580.     },

  581.     .init_thread_copy      = ONLY_IF_THREADS_ENABLED(ff_rv34_decode_init_thread_copy),

  582.     .update_thread_context = ONLY_IF_THREADS_ENABLED(ff_rv34_decode_update_thread_context),

  583. };