ffmpeg/libavcodec/rv40.c

   1 /*
   2  * RV40 decoder
   3  * Copyright (c) 2007 Konstantin Shishkov
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg 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  * FFmpeg 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 FFmpeg; 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 "mpegutils.h"
  31 #include "mpegvideo.h"
  32 #include "golomb.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
 134     memset(si, 0, sizeof(SliceInfo));
 135     if(get_bits1(gb))
 136         return -1;
 137     si->type = get_bits(gb, 2);
 138     if(si->type == 1) si->type = 0;
 139     si->quant = get_bits(gb, 5);
 140     if(get_bits(gb, 2))
 141         return -1;
 142     si->vlc_set = get_bits(gb, 2);
 143     skip_bits1(gb);
 144     si->pts = get_bits(gb, 13);
 145     if(!si->type || !get_bits1(gb))
 146         rv40_parse_picture_size(gb, &w, &h);
 147     if(av_image_check_size(w, h, 0, r->s.avctx) < 0)
 148         return -1;
 149     si->width  = w;
 150     si->height = h;
 151     mb_size = ((w + 15) >> 4) * ((h + 15) >> 4);
 152     mb_bits = ff_rv34_get_start_offset(gb, mb_size);
 153     si->start = get_bits(gb, mb_bits);
 154
 155     return 0;
 156 }
 157
 158 /**
 159  * Decode 4x4 intra types array.
 160  */
 161 static int rv40_decode_intra_types(RV34DecContext *r, GetBitContext *gb, int8_t *dst)
 162 {
 163     MpegEncContext *s = &r->s;
 164     int i, j, k, v;
 165     int A, B, C;
 166     int pattern;
 167     int8_t *ptr;
 168
 169     for(i = 0; i < 4; i++, dst += r->intra_types_stride){
 170         if(!i && s->first_slice_line){
 171             pattern = get_vlc2(gb, aic_top_vlc.table, AIC_TOP_BITS, 1);
 172             dst[0] = (pattern >> 2) & 2;
 173             dst[1] = (pattern >> 1) & 2;
 174             dst[2] =  pattern       & 2;
 175             dst[3] = (pattern << 1) & 2;
 176             continue;
 177         }
 178         ptr = dst;
 179         for(j = 0; j < 4; j++){
 180             /* Coefficients are read using VLC chosen by the prediction pattern
 181              * The first one (used for retrieving a pair of coefficients) is
 182              * constructed from the top, top right and left coefficients
 183              * The second one (used for retrieving only one coefficient) is
 184              * top + 10 * left.
 185              */
 186             A = ptr[-r->intra_types_stride + 1]; // it won't be used for the last coefficient in a row
 187             B = ptr[-r->intra_types_stride];
 188             C = ptr[-1];
 189             pattern = A + (B << 4) + (C << 8);
 190             for(k = 0; k < MODE2_PATTERNS_NUM; k++)
 191                 if(pattern == rv40_aic_table_index[k])
 192                     break;
 193             if(j < 3 && k < MODE2_PATTERNS_NUM){ //pattern is found, decoding 2 coefficients
 194                 v = get_vlc2(gb, aic_mode2_vlc[k].table, AIC_MODE2_BITS, 2);
 195                 *ptr++ = v/9;
 196                 *ptr++ = v%9;
 197                 j++;
 198             }else{
 199                 if(B != -1 && C != -1)
 200                     v = get_vlc2(gb, aic_mode1_vlc[B + C*10].table, AIC_MODE1_BITS, 1);
 201                 else{ // tricky decoding
 202                     v = 0;
 203                     switch(C){
 204                     case -1: // code 0 -> 1, 1 -> 0
 205                         if(B < 2)
 206                             v = get_bits1(gb) ^ 1;
 207                         break;
 208                     case  0:
 209                     case  2: // code 0 -> 2, 1 -> 0
 210                         v = (get_bits1(gb) ^ 1) << 1;
 211                         break;
 212                     }
 213                 }
 214                 *ptr++ = v;
 215             }
 216         }
 217     }
 218     return 0;
 219 }
 220
 221 /**
 222  * Decode macroblock information.
 223  */
 224 static int rv40_decode_mb_info(RV34DecContext *r)
 225 {
 226     MpegEncContext *s = &r->s;
 227     GetBitContext *gb = &s->gb;
 228     int q, i;
 229     int prev_type = 0;
 230     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
 231
 232     if(!r->s.mb_skip_run) {
 233         r->s.mb_skip_run = svq3_get_ue_golomb(gb) + 1;
 234         if(r->s.mb_skip_run > (unsigned)s->mb_num)
 235             return -1;
 236     }
 237
 238     if(--r->s.mb_skip_run)
 239          return RV34_MB_SKIP;
 240
 241     if(r->avail_cache[6-4]){
 242         int blocks[RV34_MB_TYPES] = {0};
 243         int count = 0;
 244         if(r->avail_cache[6-1])
 245             blocks[r->mb_type[mb_pos - 1]]++;
 246         blocks[r->mb_type[mb_pos - s->mb_stride]]++;
 247         if(r->avail_cache[6-2])
 248             blocks[r->mb_type[mb_pos - s->mb_stride + 1]]++;
 249         if(r->avail_cache[6-5])
 250             blocks[r->mb_type[mb_pos - s->mb_stride - 1]]++;
 251         for(i = 0; i < RV34_MB_TYPES; i++){
 252             if(blocks[i] > count){
 253                 count = blocks[i];
 254                 prev_type = i;
 255                 if(count>1)
 256                     break;
 257             }
 258         }
 259     } else if (r->avail_cache[6-1])
 260         prev_type = r->mb_type[mb_pos - 1];
 261
 262     if(s->pict_type == AV_PICTURE_TYPE_P){
 263         prev_type = block_num_to_ptype_vlc_num[prev_type];
 264         q = get_vlc2(gb, ptype_vlc[prev_type].table, PTYPE_VLC_BITS, 1);
 265         if(q < PBTYPE_ESCAPE)
 266             return q;
 267         q = get_vlc2(gb, ptype_vlc[prev_type].table, PTYPE_VLC_BITS, 1);
 268         av_log(s->avctx, AV_LOG_ERROR, "Dquant for P-frame\n");
 269     }else{
 270         prev_type = block_num_to_btype_vlc_num[prev_type];
 271         q = get_vlc2(gb, btype_vlc[prev_type].table, BTYPE_VLC_BITS, 1);
 272         if(q < PBTYPE_ESCAPE)
 273             return q;
 274         q = get_vlc2(gb, btype_vlc[prev_type].table, BTYPE_VLC_BITS, 1);
 275         av_log(s->avctx, AV_LOG_ERROR, "Dquant for B-frame\n");
 276     }
 277     return 0;
 278 }
 279
 280 enum RV40BlockPos{
 281     POS_CUR,
 282     POS_TOP,
 283     POS_LEFT,
 284     POS_BOTTOM,
 285 };
 286
 287 #define MASK_CUR          0x0001
 288 #define MASK_RIGHT        0x0008
 289 #define MASK_BOTTOM       0x0010
 290 #define MASK_TOP          0x1000
 291 #define MASK_Y_TOP_ROW    0x000F
 292 #define MASK_Y_LAST_ROW   0xF000
 293 #define MASK_Y_LEFT_COL   0x1111
 294 #define MASK_Y_RIGHT_COL  0x8888
 295 #define MASK_C_TOP_ROW    0x0003
 296 #define MASK_C_LAST_ROW   0x000C
 297 #define MASK_C_LEFT_COL   0x0005
 298 #define MASK_C_RIGHT_COL  0x000A
 299
 300 static const int neighbour_offs_x[4] = { 0,  0, -1, 0 };
 301 static const int neighbour_offs_y[4] = { 0, -1,  0, 1 };
 302
 303 static void rv40_adaptive_loop_filter(RV34DSPContext *rdsp,
 304                                       uint8_t *src, int stride, int dmode,
 305                                       int lim_q1, int lim_p1,
 306                                       int alpha, int beta, int beta2,
 307                                       int chroma, int edge, int dir)
 308 {
 309     int filter_p1, filter_q1;
 310     int strong;
 311     int lims;
 312
 313     strong = rdsp->rv40_loop_filter_strength[dir](src, stride, beta, beta2,
 314                                                   edge, &filter_p1, &filter_q1);
 315
 316     lims = filter_p1 + filter_q1 + ((lim_q1 + lim_p1) >> 1) + 1;
 317
 318     if (strong) {
 319         rdsp->rv40_strong_loop_filter[dir](src, stride, alpha,
 320                                            lims, dmode, chroma);
 321     } else if (filter_p1 & filter_q1) {
 322         rdsp->rv40_weak_loop_filter[dir](src, stride, 1, 1, alpha, beta,
 323                                          lims, lim_q1, lim_p1);
 324     } else if (filter_p1 | filter_q1) {
 325         rdsp->rv40_weak_loop_filter[dir](src, stride, filter_p1, filter_q1,
 326                                          alpha, beta, lims >> 1, lim_q1 >> 1,
 327                                          lim_p1 >> 1);
 328     }
 329 }
 330
 331 /**
 332  * RV40 loop filtering function
 333  */
 334 static void rv40_loop_filter(RV34DecContext *r, int row)
 335 {
 336     MpegEncContext *s = &r->s;
 337     int mb_pos, mb_x;
 338     int i, j, k;
 339     uint8_t *Y, *C;
 340     int alpha, beta, betaY, betaC;
 341     int q;
 342     int mbtype[4];   ///< current macroblock and its neighbours types
 343     /**
 344      * flags indicating that macroblock can be filtered with strong filter
 345      * it is set only for intra coded MB and MB with DCs coded separately
 346      */
 347     int mb_strong[4];
 348     int clip[4];     ///< MB filter clipping value calculated from filtering strength
 349     /**
 350      * coded block patterns for luma part of current macroblock and its neighbours
 351      * Format:
 352      * LSB corresponds to the top left block,
 353      * each nibble represents one row of subblocks.
 354      */
 355     int cbp[4];
 356     /**
 357      * coded block patterns for chroma part of current macroblock and its neighbours
 358      * Format is the same as for luma with two subblocks in a row.
 359      */
 360     int uvcbp[4][2];
 361     /**
 362      * This mask represents the pattern of luma subblocks that should be filtered
 363      * in addition to the coded ones because they lie at the edge of
 364      * 8x8 block with different enough motion vectors
 365      */
 366     unsigned mvmasks[4];
 367
 368     mb_pos = row * s->mb_stride;
 369     for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
 370         int mbtype = s->current_picture_ptr->mb_type[mb_pos];
 371         if(IS_INTRA(mbtype) || IS_SEPARATE_DC(mbtype))
 372             r->cbp_luma  [mb_pos] = r->deblock_coefs[mb_pos] = 0xFFFF;
 373         if(IS_INTRA(mbtype))
 374             r->cbp_chroma[mb_pos] = 0xFF;
 375     }
 376     mb_pos = row * s->mb_stride;
 377     for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
 378         int y_h_deblock, y_v_deblock;
 379         int c_v_deblock[2], c_h_deblock[2];
 380         int clip_left;
 381         int avail[4];
 382         unsigned y_to_deblock;
 383         int c_to_deblock[2];
 384
 385         q = s->current_picture_ptr->qscale_table[mb_pos];
 386         alpha = rv40_alpha_tab[q];
 387         beta  = rv40_beta_tab [q];
 388         betaY = betaC = beta * 3;
 389         if(s->width * s->height <= 176*144)
 390             betaY += beta;
 391
 392         avail[0] = 1;
 393         avail[1] = row;
 394         avail[2] = mb_x;
 395         avail[3] = row < s->mb_height - 1;
 396         for(i = 0; i < 4; i++){
 397             if(avail[i]){
 398                 int pos = mb_pos + neighbour_offs_x[i] + neighbour_offs_y[i]*s->mb_stride;
 399                 mvmasks[i] = r->deblock_coefs[pos];
 400                 mbtype [i] = s->current_picture_ptr->mb_type[pos];
 401                 cbp    [i] = r->cbp_luma[pos];
 402                 uvcbp[i][0] = r->cbp_chroma[pos] & 0xF;
 403                 uvcbp[i][1] = r->cbp_chroma[pos] >> 4;
 404             }else{
 405                 mvmasks[i] = 0;
 406                 mbtype [i] = mbtype[0];
 407                 cbp    [i] = 0;
 408                 uvcbp[i][0] = uvcbp[i][1] = 0;
 409             }
 410             mb_strong[i] = IS_INTRA(mbtype[i]) || IS_SEPARATE_DC(mbtype[i]);
 411             clip[i] = rv40_filter_clip_tbl[mb_strong[i] + 1][q];
 412         }
 413         y_to_deblock =  mvmasks[POS_CUR]
 414                      | (mvmasks[POS_BOTTOM] << 16);
 415         /* This pattern contains bits signalling that horizontal edges of
 416          * the current block can be filtered.
 417          * That happens when either of adjacent subblocks is coded or lies on
 418          * the edge of 8x8 blocks with motion vectors differing by more than
 419          * 3/4 pel in any component (any edge orientation for some reason).
 420          */
 421         y_h_deblock =   y_to_deblock
 422                     | ((cbp[POS_CUR]                           <<  4) & ~MASK_Y_TOP_ROW)
 423                     | ((cbp[POS_TOP]        & MASK_Y_LAST_ROW) >> 12);
 424         /* This pattern contains bits signalling that vertical edges of
 425          * the current block can be filtered.
 426          * That happens when either of adjacent subblocks is coded or lies on
 427          * the edge of 8x8 blocks with motion vectors differing by more than
 428          * 3/4 pel in any component (any edge orientation for some reason).
 429          */
 430         y_v_deblock =   y_to_deblock
 431                     | ((cbp[POS_CUR]                      << 1) & ~MASK_Y_LEFT_COL)
 432                     | ((cbp[POS_LEFT] & MASK_Y_RIGHT_COL) >> 3);
 433         if(!mb_x)
 434             y_v_deblock &= ~MASK_Y_LEFT_COL;
 435         if(!row)
 436             y_h_deblock &= ~MASK_Y_TOP_ROW;
 437         if(row == s->mb_height - 1 || (mb_strong[POS_CUR] | mb_strong[POS_BOTTOM]))
 438             y_h_deblock &= ~(MASK_Y_TOP_ROW << 16);
 439         /* Calculating chroma patterns is similar and easier since there is
 440          * no motion vector pattern for them.
 441          */
 442         for(i = 0; i < 2; i++){
 443             c_to_deblock[i] = (uvcbp[POS_BOTTOM][i] << 4) | uvcbp[POS_CUR][i];
 444             c_v_deblock[i] =   c_to_deblock[i]
 445                            | ((uvcbp[POS_CUR] [i]                       << 1) & ~MASK_C_LEFT_COL)
 446                            | ((uvcbp[POS_LEFT][i]   & MASK_C_RIGHT_COL) >> 1);
 447             c_h_deblock[i] =   c_to_deblock[i]
 448                            | ((uvcbp[POS_TOP][i]    & MASK_C_LAST_ROW)  >> 2)
 449                            |  (uvcbp[POS_CUR][i]                        << 2);
 450             if(!mb_x)
 451                 c_v_deblock[i] &= ~MASK_C_LEFT_COL;
 452             if(!row)
 453                 c_h_deblock[i] &= ~MASK_C_TOP_ROW;
 454             if(row == s->mb_height - 1 || (mb_strong[POS_CUR] | mb_strong[POS_BOTTOM]))
 455                 c_h_deblock[i] &= ~(MASK_C_TOP_ROW << 4);
 456         }
 457
 458         for(j = 0; j < 16; j += 4){
 459             Y = s->current_picture_ptr->f->data[0] + mb_x*16 + (row*16 + j) * s->linesize;
 460             for(i = 0; i < 4; i++, Y += 4){
 461                 int ij = i + j;
 462                 int clip_cur = y_to_deblock & (MASK_CUR << ij) ? clip[POS_CUR] : 0;
 463                 int dither = j ? ij : i*4;
 464
 465                 // if bottom block is coded then we can filter its top edge
 466                 // (or bottom edge of this block, which is the same)
 467                 if(y_h_deblock & (MASK_BOTTOM << ij)){
 468                     rv40_adaptive_loop_filter(&r->rdsp, Y+4*s->linesize,
 469                                               s->linesize, dither,
 470                                               y_to_deblock & (MASK_BOTTOM << ij) ? clip[POS_CUR] : 0,
 471                                               clip_cur, alpha, beta, betaY,
 472                                               0, 0, 0);
 473                 }
 474                 // filter left block edge in ordinary mode (with low filtering strength)
 475                 if(y_v_deblock & (MASK_CUR << ij) && (i || !(mb_strong[POS_CUR] | mb_strong[POS_LEFT]))){
 476                     if(!i)
 477                         clip_left = mvmasks[POS_LEFT] & (MASK_RIGHT << j) ? clip[POS_LEFT] : 0;
 478                     else
 479                         clip_left = y_to_deblock & (MASK_CUR << (ij-1)) ? clip[POS_CUR] : 0;
 480                     rv40_adaptive_loop_filter(&r->rdsp, Y, s->linesize, dither,
 481                                               clip_cur,
 482                                               clip_left,
 483                                               alpha, beta, betaY, 0, 0, 1);
 484                 }
 485                 // filter top edge of the current macroblock when filtering strength is high
 486                 if(!j && y_h_deblock & (MASK_CUR << i) && (mb_strong[POS_CUR] | mb_strong[POS_TOP])){
 487                     rv40_adaptive_loop_filter(&r->rdsp, Y, s->linesize, dither,
 488                                        clip_cur,
 489                                        mvmasks[POS_TOP] & (MASK_TOP << i) ? clip[POS_TOP] : 0,
 490                                        alpha, beta, betaY, 0, 1, 0);
 491                 }
 492                 // filter left block edge in edge mode (with high filtering strength)
 493                 if(y_v_deblock & (MASK_CUR << ij) && !i && (mb_strong[POS_CUR] | mb_strong[POS_LEFT])){
 494                     clip_left = mvmasks[POS_LEFT] & (MASK_RIGHT << j) ? clip[POS_LEFT] : 0;
 495                     rv40_adaptive_loop_filter(&r->rdsp, Y, s->linesize, dither,
 496                                        clip_cur,
 497                                        clip_left,
 498                                        alpha, beta, betaY, 0, 1, 1);
 499                 }
 500             }
 501         }
 502         for(k = 0; k < 2; k++){
 503             for(j = 0; j < 2; j++){
 504                 C = s->current_picture_ptr->f->data[k + 1] + mb_x*8 + (row*8 + j*4) * s->uvlinesize;
 505                 for(i = 0; i < 2; i++, C += 4){
 506                     int ij = i + j*2;
 507                     int clip_cur = c_to_deblock[k] & (MASK_CUR << ij) ? clip[POS_CUR] : 0;
 508                     if(c_h_deblock[k] & (MASK_CUR << (ij+2))){
 509                         int clip_bot = c_to_deblock[k] & (MASK_CUR << (ij+2)) ? clip[POS_CUR] : 0;
 510                         rv40_adaptive_loop_filter(&r->rdsp, C+4*s->uvlinesize, s->uvlinesize, i*8,
 511                                            clip_bot,
 512                                            clip_cur,
 513                                            alpha, beta, betaC, 1, 0, 0);
 514                     }
 515                     if((c_v_deblock[k] & (MASK_CUR << ij)) && (i || !(mb_strong[POS_CUR] | mb_strong[POS_LEFT]))){
 516                         if(!i)
 517                             clip_left = uvcbp[POS_LEFT][k] & (MASK_CUR << (2*j+1)) ? clip[POS_LEFT] : 0;
 518                         else
 519                             clip_left = c_to_deblock[k]    & (MASK_CUR << (ij-1))  ? clip[POS_CUR]  : 0;
 520                         rv40_adaptive_loop_filter(&r->rdsp, C, s->uvlinesize, j*8,
 521                                            clip_cur,
 522                                            clip_left,
 523                                            alpha, beta, betaC, 1, 0, 1);
 524                     }
 525                     if(!j && c_h_deblock[k] & (MASK_CUR << ij) && (mb_strong[POS_CUR] | mb_strong[POS_TOP])){
 526                         int clip_top = uvcbp[POS_TOP][k] & (MASK_CUR << (ij+2)) ? clip[POS_TOP] : 0;
 527                         rv40_adaptive_loop_filter(&r->rdsp, C, s->uvlinesize, i*8,
 528                                            clip_cur,
 529                                            clip_top,
 530                                            alpha, beta, betaC, 1, 1, 0);
 531                     }
 532                     if(c_v_deblock[k] & (MASK_CUR << ij) && !i && (mb_strong[POS_CUR] | mb_strong[POS_LEFT])){
 533                         clip_left = uvcbp[POS_LEFT][k] & (MASK_CUR << (2*j+1)) ? clip[POS_LEFT] : 0;
 534                         rv40_adaptive_loop_filter(&r->rdsp, C, s->uvlinesize, j*8,
 535                                            clip_cur,
 536                                            clip_left,
 537                                            alpha, beta, betaC, 1, 1, 1);
 538                     }
 539                 }
 540             }
 541         }
 542     }
 543 }
 544
 545 /**
 546  * Initialize decoder.
 547  */
 548 static av_cold int rv40_decode_init(AVCodecContext *avctx)
 549 {
 550     RV34DecContext *r = avctx->priv_data;
 551     int ret;
 552
 553     r->rv30 = 0;
 554     if ((ret = ff_rv34_decode_init(avctx)) < 0)
 555         return ret;
 556     if(!aic_top_vlc.bits)
 557         rv40_init_tables();
 558     r->parse_slice_header = rv40_parse_slice_header;
 559     r->decode_intra_types = rv40_decode_intra_types;
 560     r->decode_mb_info     = rv40_decode_mb_info;
 561     r->loop_filter        = rv40_loop_filter;
 562     r->luma_dc_quant_i = rv40_luma_dc_quant[0];
 563     r->luma_dc_quant_p = rv40_luma_dc_quant[1];
 564     return 0;
 565 }
 566
 567 AVCodec ff_rv40_decoder = {
 568     .name                  = "rv40",
 569     .long_name             = NULL_IF_CONFIG_SMALL("RealVideo 4.0"),
 570     .type                  = AVMEDIA_TYPE_VIDEO,
 571     .id                    = AV_CODEC_ID_RV40,
 572     .priv_data_size        = sizeof(RV34DecContext),
 573     .init                  = rv40_decode_init,
 574     .close                 = ff_rv34_decode_end,
 575     .decode                = ff_rv34_decode_frame,
 576     .capabilities          = CODEC_CAP_DR1 | CODEC_CAP_DELAY |
 577                              CODEC_CAP_FRAME_THREADS,
 578     .flush                 = ff_mpeg_flush,
 579     .pix_fmts              = (const enum AVPixelFormat[]) {
 580         AV_PIX_FMT_YUV420P,
 581         AV_PIX_FMT_NONE
 582     },
 583     .init_thread_copy      = ONLY_IF_THREADS_ENABLED(ff_rv34_decode_init_thread_copy),
 584     .update_thread_context = ONLY_IF_THREADS_ENABLED(ff_rv34_decode_update_thread_context),
 585 };