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   1 /*
   2  * VC-1 and WMV3 decoder
   3  * Copyright (c) 2011 Mashiat Sarker Shakkhar
   4  * Copyright (c) 2006-2007 Konstantin Shishkov
   5  * Partly based on vc9.c (c) 2005 Anonymous, Alex Beregszaszi, Michael Niedermayer
   6  *
   7  * This file is part of FFmpeg.
   8  *
   9  * FFmpeg is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2.1 of the License, or (at your option) any later version.
  13  *
  14  * FFmpeg is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with FFmpeg; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  22  */
  23
  24 /**
  25  * @file
  26  * VC-1 and WMV3 block decoding routines
  27  */
  28
  29 #include "avcodec.h"
  30 #include "mpegutils.h"
  31 #include "mpegvideo.h"
  32 #include "msmpeg4data.h"
  33 #include "unary.h"
  34 #include "vc1.h"
  35 #include "vc1_pred.h"
  36 #include "vc1acdata.h"
  37 #include "vc1data.h"
  38
  39 #define MB_INTRA_VLC_BITS 9
  40 #define DC_VLC_BITS 9
  41
  42 // offset tables for interlaced picture MVDATA decoding
  43 static const int offset_table1[9] = {  0,  1,  2,  4,  8, 16, 32,  64, 128 };
  44 static const int offset_table2[9] = {  0,  1,  3,  7, 15, 31, 63, 127, 255 };
  45
  46 /***********************************************************************/
  47 /**
  48  * @name VC-1 Bitplane decoding
  49  * @see 8.7, p56
  50  * @{
  51  */
  52
  53
  54 static void init_block_index(VC1Context *v)
  55 {
  56     MpegEncContext *s = &v->s;
  57     ff_init_block_index(s);
  58     if (v->field_mode && !(v->second_field ^ v->tff)) {
  59         s->dest[0] += s->current_picture_ptr->f->linesize[0];
  60         s->dest[1] += s->current_picture_ptr->f->linesize[1];
  61         s->dest[2] += s->current_picture_ptr->f->linesize[2];
  62     }
  63 }
  64
  65 /** @} */ //Bitplane group
  66
  67 static void vc1_put_signed_blocks_clamped(VC1Context *v)
  68 {
  69     MpegEncContext *s = &v->s;
  70     int topleft_mb_pos, top_mb_pos;
  71     int stride_y, fieldtx = 0;
  72     int v_dist;
  73
  74     /* The put pixels loop is always one MB row behind the decoding loop,
  75      * because we can only put pixels when overlap filtering is done, and
  76      * for filtering of the bottom edge of a MB, we need the next MB row
  77      * present as well.
  78      * Within the row, the put pixels loop is also one MB col behind the
  79      * decoding loop. The reason for this is again, because for filtering
  80      * of the right MB edge, we need the next MB present. */
  81     if (!s->first_slice_line) {
  82         if (s->mb_x) {
  83             topleft_mb_pos = (s->mb_y - 1) * s->mb_stride + s->mb_x - 1;
  84             if (v->fcm == ILACE_FRAME)
  85                 fieldtx = v->fieldtx_plane[topleft_mb_pos];
  86             stride_y       = s->linesize << fieldtx;
  87             v_dist         = (16 - fieldtx) >> (fieldtx == 0);
  88             s->idsp.put_signed_pixels_clamped(v->block[v->topleft_blk_idx][0],
  89                                               s->dest[0] - 16 * s->linesize - 16,
  90                                               stride_y);
  91             s->idsp.put_signed_pixels_clamped(v->block[v->topleft_blk_idx][1],
  92                                               s->dest[0] - 16 * s->linesize - 8,
  93                                               stride_y);
  94             s->idsp.put_signed_pixels_clamped(v->block[v->topleft_blk_idx][2],
  95                                               s->dest[0] - v_dist * s->linesize - 16,
  96                                               stride_y);
  97             s->idsp.put_signed_pixels_clamped(v->block[v->topleft_blk_idx][3],
  98                                               s->dest[0] - v_dist * s->linesize - 8,
  99                                               stride_y);
 100             s->idsp.put_signed_pixels_clamped(v->block[v->topleft_blk_idx][4],
 101                                               s->dest[1] - 8 * s->uvlinesize - 8,
 102                                               s->uvlinesize);
 103             s->idsp.put_signed_pixels_clamped(v->block[v->topleft_blk_idx][5],
 104                                               s->dest[2] - 8 * s->uvlinesize - 8,
 105                                               s->uvlinesize);
 106         }
 107         if (s->mb_x == s->mb_width - 1) {
 108             top_mb_pos = (s->mb_y - 1) * s->mb_stride + s->mb_x;
 109             if (v->fcm == ILACE_FRAME)
 110                 fieldtx = v->fieldtx_plane[top_mb_pos];
 111             stride_y   = s->linesize << fieldtx;
 112             v_dist     = fieldtx ? 15 : 8;
 113             s->idsp.put_signed_pixels_clamped(v->block[v->top_blk_idx][0],
 114                                               s->dest[0] - 16 * s->linesize,
 115                                               stride_y);
 116             s->idsp.put_signed_pixels_clamped(v->block[v->top_blk_idx][1],
 117                                               s->dest[0] - 16 * s->linesize + 8,
 118                                               stride_y);
 119             s->idsp.put_signed_pixels_clamped(v->block[v->top_blk_idx][2],
 120                                               s->dest[0] - v_dist * s->linesize,
 121                                               stride_y);
 122             s->idsp.put_signed_pixels_clamped(v->block[v->top_blk_idx][3],
 123                                               s->dest[0] - v_dist * s->linesize + 8,
 124                                               stride_y);
 125             s->idsp.put_signed_pixels_clamped(v->block[v->top_blk_idx][4],
 126                                               s->dest[1] - 8 * s->uvlinesize,
 127                                               s->uvlinesize);
 128             s->idsp.put_signed_pixels_clamped(v->block[v->top_blk_idx][5],
 129                                               s->dest[2] - 8 * s->uvlinesize,
 130                                               s->uvlinesize);
 131         }
 132     }
 133
 134 #define inc_blk_idx(idx) do { \
 135         idx++; \
 136         if (idx >= v->n_allocated_blks) \
 137             idx = 0; \
 138     } while (0)
 139
 140     inc_blk_idx(v->topleft_blk_idx);
 141     inc_blk_idx(v->top_blk_idx);
 142     inc_blk_idx(v->left_blk_idx);
 143     inc_blk_idx(v->cur_blk_idx);
 144 }
 145
 146 /***********************************************************************/
 147 /**
 148  * @name VC-1 Block-level functions
 149  * @see 7.1.4, p91 and 8.1.1.7, p(1)04
 150  * @{
 151  */
 152
 153 /**
 154  * @def GET_MQUANT
 155  * @brief Get macroblock-level quantizer scale
 156  */
 157 #define GET_MQUANT()                                           \
 158     if (v->dquantfrm) {                                        \
 159         int edges = 0;                                         \
 160         if (v->dqprofile == DQPROFILE_ALL_MBS) {               \
 161             if (v->dqbilevel) {                                \
 162                 mquant = (get_bits1(gb)) ? v->altpq : v->pq;   \
 163             } else {                                           \
 164                 mqdiff = get_bits(gb, 3);                      \
 165                 if (mqdiff != 7)                               \
 166                     mquant = v->pq + mqdiff;                   \
 167                 else                                           \
 168                     mquant = get_bits(gb, 5);                  \
 169             }                                                  \
 170         }                                                      \
 171         if (v->dqprofile == DQPROFILE_SINGLE_EDGE)             \
 172             edges = 1 << v->dqsbedge;                          \
 173         else if (v->dqprofile == DQPROFILE_DOUBLE_EDGES)       \
 174             edges = (3 << v->dqsbedge) % 15;                   \
 175         else if (v->dqprofile == DQPROFILE_FOUR_EDGES)         \
 176             edges = 15;                                        \
 177         if ((edges&1) && !s->mb_x)                             \
 178             mquant = v->altpq;                                 \
 179         if ((edges&2) && s->first_slice_line)                  \
 180             mquant = v->altpq;                                 \
 181         if ((edges&4) && s->mb_x == (s->mb_width - 1))         \
 182             mquant = v->altpq;                                 \
 183         if ((edges&8) && s->mb_y == (s->mb_height - 1))        \
 184             mquant = v->altpq;                                 \
 185         if (!mquant || mquant > 31) {                          \
 186             av_log(v->s.avctx, AV_LOG_ERROR,                   \
 187                    "Overriding invalid mquant %d\n", mquant);  \
 188             mquant = 1;                                        \
 189         }                                                      \
 190     }
 191
 192 /**
 193  * @def GET_MVDATA(_dmv_x, _dmv_y)
 194  * @brief Get MV differentials
 195  * @see MVDATA decoding from 8.3.5.2, p(1)20
 196  * @param _dmv_x Horizontal differential for decoded MV
 197  * @param _dmv_y Vertical differential for decoded MV
 198  */
 199 #define GET_MVDATA(_dmv_x, _dmv_y)                                      \
 200     index = 1 + get_vlc2(gb, ff_vc1_mv_diff_vlc[s->mv_table_index].table, \
 201                          VC1_MV_DIFF_VLC_BITS, 2);                      \
 202     if (index > 36) {                                                   \
 203         mb_has_coeffs = 1;                                              \
 204         index -= 37;                                                    \
 205     } else                                                              \
 206         mb_has_coeffs = 0;                                              \
 207     s->mb_intra = 0;                                                    \
 208     if (!index) {                                                       \
 209         _dmv_x = _dmv_y = 0;                                            \
 210     } else if (index == 35) {                                           \
 211         _dmv_x = get_bits(gb, v->k_x - 1 + s->quarter_sample);          \
 212         _dmv_y = get_bits(gb, v->k_y - 1 + s->quarter_sample);          \
 213     } else if (index == 36) {                                           \
 214         _dmv_x = 0;                                                     \
 215         _dmv_y = 0;                                                     \
 216         s->mb_intra = 1;                                                \
 217     } else {                                                            \
 218         index1 = index % 6;                                             \
 219         if (!s->quarter_sample && index1 == 5) val = 1;                 \
 220         else                                   val = 0;                 \
 221         if (size_table[index1] - val > 0)                               \
 222             val = get_bits(gb, size_table[index1] - val);               \
 223         else                                   val = 0;                 \
 224         sign = 0 - (val&1);                                             \
 225         _dmv_x = (sign ^ ((val>>1) + offset_table[index1])) - sign;     \
 226                                                                         \
 227         index1 = index / 6;                                             \
 228         if (!s->quarter_sample && index1 == 5) val = 1;                 \
 229         else                                   val = 0;                 \
 230         if (size_table[index1] - val > 0)                               \
 231             val = get_bits(gb, size_table[index1] - val);               \
 232         else                                   val = 0;                 \
 233         sign = 0 - (val & 1);                                           \
 234         _dmv_y = (sign ^ ((val >> 1) + offset_table[index1])) - sign;   \
 235     }
 236
 237 static av_always_inline void get_mvdata_interlaced(VC1Context *v, int *dmv_x,
 238                                                    int *dmv_y, int *pred_flag)
 239 {
 240     int index, index1;
 241     int extend_x = 0, extend_y = 0;
 242     GetBitContext *gb = &v->s.gb;
 243     int bits, esc;
 244     int val, sign;
 245     const int* offs_tab;
 246
 247     if (v->numref) {
 248         bits = VC1_2REF_MVDATA_VLC_BITS;
 249         esc  = 125;
 250     } else {
 251         bits = VC1_1REF_MVDATA_VLC_BITS;
 252         esc  = 71;
 253     }
 254     switch (v->dmvrange) {
 255     case 1:
 256         extend_x = 1;
 257         break;
 258     case 2:
 259         extend_y = 1;
 260         break;
 261     case 3:
 262         extend_x = extend_y = 1;
 263         break;
 264     }
 265     index = get_vlc2(gb, v->imv_vlc->table, bits, 3);
 266     if (index == esc) {
 267         *dmv_x = get_bits(gb, v->k_x);
 268         *dmv_y = get_bits(gb, v->k_y);
 269         if (v->numref) {
 270             if (pred_flag) {
 271                 *pred_flag = *dmv_y & 1;
 272                 *dmv_y     = (*dmv_y + *pred_flag) >> 1;
 273             } else {
 274                 *dmv_y     = (*dmv_y + (*dmv_y & 1)) >> 1;
 275             }
 276         }
 277     }
 278     else {
 279         av_assert0(index < esc);
 280         if (extend_x)
 281             offs_tab = offset_table2;
 282         else
 283             offs_tab = offset_table1;
 284         index1 = (index + 1) % 9;
 285         if (index1 != 0) {
 286             val    = get_bits(gb, index1 + extend_x);
 287             sign   = 0 -(val & 1);
 288             *dmv_x = (sign ^ ((val >> 1) + offs_tab[index1])) - sign;
 289         } else
 290             *dmv_x = 0;
 291         if (extend_y)
 292             offs_tab = offset_table2;
 293         else
 294             offs_tab = offset_table1;
 295         index1 = (index + 1) / 9;
 296         if (index1 > v->numref) {
 297             val    = get_bits(gb, (index1 + (extend_y << v->numref)) >> v->numref);
 298             sign   = 0 - (val & 1);
 299             *dmv_y = (sign ^ ((val >> 1) + offs_tab[index1 >> v->numref])) - sign;
 300         } else
 301             *dmv_y = 0;
 302         if (v->numref && pred_flag)
 303             *pred_flag = index1 & 1;
 304     }
 305 }
 306
 307 /** Reconstruct motion vector for B-frame and do motion compensation
 308  */
 309 static inline void vc1_b_mc(VC1Context *v, int dmv_x[2], int dmv_y[2],
 310                             int direct, int mode)
 311 {
 312     if (direct) {
 313         ff_vc1_mc_1mv(v, 0);
 314         ff_vc1_interp_mc(v);
 315         return;
 316     }
 317     if (mode == BMV_TYPE_INTERPOLATED) {
 318         ff_vc1_mc_1mv(v, 0);
 319         ff_vc1_interp_mc(v);
 320         return;
 321     }
 322
 323     ff_vc1_mc_1mv(v, (mode == BMV_TYPE_BACKWARD));
 324 }
 325
 326 /** Get predicted DC value for I-frames only
 327  * prediction dir: left=0, top=1
 328  * @param s MpegEncContext
 329  * @param overlap flag indicating that overlap filtering is used
 330  * @param pq integer part of picture quantizer
 331  * @param[in] n block index in the current MB
 332  * @param dc_val_ptr Pointer to DC predictor
 333  * @param dir_ptr Prediction direction for use in AC prediction
 334  */
 335 static inline int vc1_i_pred_dc(MpegEncContext *s, int overlap, int pq, int n,
 336                                 int16_t **dc_val_ptr, int *dir_ptr)
 337 {
 338     int a, b, c, wrap, pred, scale;
 339     int16_t *dc_val;
 340     static const uint16_t dcpred[32] = {
 341         -1, 1024,  512,  341,  256,  205,  171,  146,  128,
 342              114,  102,   93,   85,   79,   73,   68,   64,
 343               60,   57,   54,   51,   49,   47,   45,   43,
 344               41,   39,   38,   37,   35,   34,   33
 345     };
 346
 347     /* find prediction - wmv3_dc_scale always used here in fact */
 348     if (n < 4) scale = s->y_dc_scale;
 349     else       scale = s->c_dc_scale;
 350
 351     wrap   = s->block_wrap[n];
 352     dc_val = s->dc_val[0] + s->block_index[n];
 353
 354     /* B A
 355      * C X
 356      */
 357     c = dc_val[ - 1];
 358     b = dc_val[ - 1 - wrap];
 359     a = dc_val[ - wrap];
 360
 361     if (pq < 9 || !overlap) {
 362         /* Set outer values */
 363         if (s->first_slice_line && (n != 2 && n != 3))
 364             b = a = dcpred[scale];
 365         if (s->mb_x == 0 && (n != 1 && n != 3))
 366             b = c = dcpred[scale];
 367     } else {
 368         /* Set outer values */
 369         if (s->first_slice_line && (n != 2 && n != 3))
 370             b = a = 0;
 371         if (s->mb_x == 0 && (n != 1 && n != 3))
 372             b = c = 0;
 373     }
 374
 375     if (abs(a - b) <= abs(b - c)) {
 376         pred     = c;
 377         *dir_ptr = 1; // left
 378     } else {
 379         pred     = a;
 380         *dir_ptr = 0; // top
 381     }
 382
 383     /* update predictor */
 384     *dc_val_ptr = &dc_val[0];
 385     return pred;
 386 }
 387
 388
 389 /** Get predicted DC value
 390  * prediction dir: left=0, top=1
 391  * @param s MpegEncContext
 392  * @param overlap flag indicating that overlap filtering is used
 393  * @param pq integer part of picture quantizer
 394  * @param[in] n block index in the current MB
 395  * @param a_avail flag indicating top block availability
 396  * @param c_avail flag indicating left block availability
 397  * @param dc_val_ptr Pointer to DC predictor
 398  * @param dir_ptr Prediction direction for use in AC prediction
 399  */
 400 static inline int ff_vc1_pred_dc(MpegEncContext *s, int overlap, int pq, int n,
 401                               int a_avail, int c_avail,
 402                               int16_t **dc_val_ptr, int *dir_ptr)
 403 {
 404     int a, b, c, wrap, pred;
 405     int16_t *dc_val;
 406     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
 407     int q1, q2 = 0;
 408     int dqscale_index;
 409
 410     wrap = s->block_wrap[n];
 411     dc_val = s->dc_val[0] + s->block_index[n];
 412
 413     /* B A
 414      * C X
 415      */
 416     c = dc_val[ - 1];
 417     b = dc_val[ - 1 - wrap];
 418     a = dc_val[ - wrap];
 419     /* scale predictors if needed */
 420     q1 = s->current_picture.qscale_table[mb_pos];
 421     dqscale_index = s->y_dc_scale_table[q1] - 1;
 422     if (dqscale_index < 0)
 423         return 0;
 424     if (c_avail && (n != 1 && n != 3)) {
 425         q2 = s->current_picture.qscale_table[mb_pos - 1];
 426         if (q2 && q2 != q1)
 427             c = (c * s->y_dc_scale_table[q2] * ff_vc1_dqscale[dqscale_index] + 0x20000) >> 18;
 428     }
 429     if (a_avail && (n != 2 && n != 3)) {
 430         q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];
 431         if (q2 && q2 != q1)
 432             a = (a * s->y_dc_scale_table[q2] * ff_vc1_dqscale[dqscale_index] + 0x20000) >> 18;
 433     }
 434     if (a_avail && c_avail && (n != 3)) {
 435         int off = mb_pos;
 436         if (n != 1)
 437             off--;
 438         if (n != 2)
 439             off -= s->mb_stride;
 440         q2 = s->current_picture.qscale_table[off];
 441         if (q2 && q2 != q1)
 442             b = (b * s->y_dc_scale_table[q2] * ff_vc1_dqscale[dqscale_index] + 0x20000) >> 18;
 443     }
 444
 445     if (a_avail && c_avail) {
 446         if (abs(a - b) <= abs(b - c)) {
 447             pred     = c;
 448             *dir_ptr = 1; // left
 449         } else {
 450             pred     = a;
 451             *dir_ptr = 0; // top
 452         }
 453     } else if (a_avail) {
 454         pred     = a;
 455         *dir_ptr = 0; // top
 456     } else if (c_avail) {
 457         pred     = c;
 458         *dir_ptr = 1; // left
 459     } else {
 460         pred     = 0;
 461         *dir_ptr = 1; // left
 462     }
 463
 464     /* update predictor */
 465     *dc_val_ptr = &dc_val[0];
 466     return pred;
 467 }
 468
 469 /** @} */ // Block group
 470
 471 /**
 472  * @name VC1 Macroblock-level functions in Simple/Main Profiles
 473  * @see 7.1.4, p91 and 8.1.1.7, p(1)04
 474  * @{
 475  */
 476
 477 static inline int vc1_coded_block_pred(MpegEncContext * s, int n,
 478                                        uint8_t **coded_block_ptr)
 479 {
 480     int xy, wrap, pred, a, b, c;
 481
 482     xy   = s->block_index[n];
 483     wrap = s->b8_stride;
 484
 485     /* B C
 486      * A X
 487      */
 488     a = s->coded_block[xy - 1       ];
 489     b = s->coded_block[xy - 1 - wrap];
 490     c = s->coded_block[xy     - wrap];
 491
 492     if (b == c) {
 493         pred = a;
 494     } else {
 495         pred = c;
 496     }
 497
 498     /* store value */
 499     *coded_block_ptr = &s->coded_block[xy];
 500
 501     return pred;
 502 }
 503
 504 /**
 505  * Decode one AC coefficient
 506  * @param v The VC1 context
 507  * @param last Last coefficient
 508  * @param skip How much zero coefficients to skip
 509  * @param value Decoded AC coefficient value
 510  * @param codingset set of VLC to decode data
 511  * @see 8.1.3.4
 512  */
 513 static void vc1_decode_ac_coeff(VC1Context *v, int *last, int *skip,
 514                                 int *value, int codingset)
 515 {
 516     GetBitContext *gb = &v->s.gb;
 517     int index, escape, run = 0, level = 0, lst = 0;
 518
 519     index = get_vlc2(gb, ff_vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);
 520     if (index != ff_vc1_ac_sizes[codingset] - 1) {
 521         run   = vc1_index_decode_table[codingset][index][0];
 522         level = vc1_index_decode_table[codingset][index][1];
 523         lst   = index >= vc1_last_decode_table[codingset] || get_bits_left(gb) < 0;
 524         if (get_bits1(gb))
 525             level = -level;
 526     } else {
 527         escape = decode210(gb);
 528         if (escape != 2) {
 529             index = get_vlc2(gb, ff_vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);
 530             run   = vc1_index_decode_table[codingset][index][0];
 531             level = vc1_index_decode_table[codingset][index][1];
 532             lst   = index >= vc1_last_decode_table[codingset];
 533             if (escape == 0) {
 534                 if (lst)
 535                     level += vc1_last_delta_level_table[codingset][run];
 536                 else
 537                     level += vc1_delta_level_table[codingset][run];
 538             } else {
 539                 if (lst)
 540                     run += vc1_last_delta_run_table[codingset][level] + 1;
 541                 else
 542                     run += vc1_delta_run_table[codingset][level] + 1;
 543             }
 544             if (get_bits1(gb))
 545                 level = -level;
 546         } else {
 547             int sign;
 548             lst = get_bits1(gb);
 549             if (v->s.esc3_level_length == 0) {
 550                 if (v->pq < 8 || v->dquantfrm) { // table 59
 551                     v->s.esc3_level_length = get_bits(gb, 3);
 552                     if (!v->s.esc3_level_length)
 553                         v->s.esc3_level_length = get_bits(gb, 2) + 8;
 554                 } else { // table 60
 555                     v->s.esc3_level_length = get_unary(gb, 1, 6) + 2;
 556                 }
 557                 v->s.esc3_run_length = 3 + get_bits(gb, 2);
 558             }
 559             run   = get_bits(gb, v->s.esc3_run_length);
 560             sign  = get_bits1(gb);
 561             level = get_bits(gb, v->s.esc3_level_length);
 562             if (sign)
 563                 level = -level;
 564         }
 565     }
 566
 567     *last  = lst;
 568     *skip  = run;
 569     *value = level;
 570 }
 571
 572 /** Decode intra block in intra frames - should be faster than decode_intra_block
 573  * @param v VC1Context
 574  * @param block block to decode
 575  * @param[in] n subblock index
 576  * @param coded are AC coeffs present or not
 577  * @param codingset set of VLC to decode data
 578  */
 579 static int vc1_decode_i_block(VC1Context *v, int16_t block[64], int n,
 580                               int coded, int codingset)
 581 {
 582     GetBitContext *gb = &v->s.gb;
 583     MpegEncContext *s = &v->s;
 584     int dc_pred_dir = 0; /* Direction of the DC prediction used */
 585     int i;
 586     int16_t *dc_val;
 587     int16_t *ac_val, *ac_val2;
 588     int dcdiff;
 589
 590     /* Get DC differential */
 591     if (n < 4) {
 592         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);
 593     } else {
 594         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);
 595     }
 596     if (dcdiff < 0) {
 597         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");
 598         return -1;
 599     }
 600     if (dcdiff) {
 601         if (dcdiff == 119 /* ESC index value */) {
 602             /* TODO: Optimize */
 603             if (v->pq == 1)      dcdiff = get_bits(gb, 10);
 604             else if (v->pq == 2) dcdiff = get_bits(gb, 9);
 605             else                 dcdiff = get_bits(gb, 8);
 606         } else {
 607             if (v->pq == 1)
 608                 dcdiff = (dcdiff << 2) + get_bits(gb, 2) - 3;
 609             else if (v->pq == 2)
 610                 dcdiff = (dcdiff << 1) + get_bits1(gb)   - 1;
 611         }
 612         if (get_bits1(gb))
 613             dcdiff = -dcdiff;
 614     }
 615
 616     /* Prediction */
 617     dcdiff += vc1_i_pred_dc(&v->s, v->overlap, v->pq, n, &dc_val, &dc_pred_dir);
 618     *dc_val = dcdiff;
 619
 620     /* Store the quantized DC coeff, used for prediction */
 621     if (n < 4) {
 622         block[0] = dcdiff * s->y_dc_scale;
 623     } else {
 624         block[0] = dcdiff * s->c_dc_scale;
 625     }
 626     /* Skip ? */
 627     if (!coded) {
 628         goto not_coded;
 629     }
 630
 631     // AC Decoding
 632     i = 1;
 633
 634     {
 635         int last = 0, skip, value;
 636         const uint8_t *zz_table;
 637         int scale;
 638         int k;
 639
 640         scale = v->pq * 2 + v->halfpq;
 641
 642         if (v->s.ac_pred) {
 643             if (!dc_pred_dir)
 644                 zz_table = v->zz_8x8[2];
 645             else
 646                 zz_table = v->zz_8x8[3];
 647         } else
 648             zz_table = v->zz_8x8[1];
 649
 650         ac_val  = s->ac_val[0][0] + s->block_index[n] * 16;
 651         ac_val2 = ac_val;
 652         if (dc_pred_dir) // left
 653             ac_val -= 16;
 654         else // top
 655             ac_val -= 16 * s->block_wrap[n];
 656
 657         while (!last) {
 658             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);
 659             i += skip;
 660             if (i > 63)
 661                 break;
 662             block[zz_table[i++]] = value;
 663         }
 664
 665         /* apply AC prediction if needed */
 666         if (s->ac_pred) {
 667             if (dc_pred_dir) { // left
 668                 for (k = 1; k < 8; k++)
 669                     block[k << v->left_blk_sh] += ac_val[k];
 670             } else { // top
 671                 for (k = 1; k < 8; k++)
 672                     block[k << v->top_blk_sh] += ac_val[k + 8];
 673             }
 674         }
 675         /* save AC coeffs for further prediction */
 676         for (k = 1; k < 8; k++) {
 677             ac_val2[k]     = block[k << v->left_blk_sh];
 678             ac_val2[k + 8] = block[k << v->top_blk_sh];
 679         }
 680
 681         /* scale AC coeffs */
 682         for (k = 1; k < 64; k++)
 683             if (block[k]) {
 684                 block[k] *= scale;
 685                 if (!v->pquantizer)
 686                     block[k] += (block[k] < 0) ? -v->pq : v->pq;
 687             }
 688
 689         if (s->ac_pred) i = 63;
 690     }
 691
 692 not_coded:
 693     if (!coded) {
 694         int k, scale;
 695         ac_val  = s->ac_val[0][0] + s->block_index[n] * 16;
 696         ac_val2 = ac_val;
 697
 698         i = 0;
 699         scale = v->pq * 2 + v->halfpq;
 700         memset(ac_val2, 0, 16 * 2);
 701         if (dc_pred_dir) { // left
 702             ac_val -= 16;
 703             if (s->ac_pred)
 704                 memcpy(ac_val2, ac_val, 8 * 2);
 705         } else { // top
 706             ac_val -= 16 * s->block_wrap[n];
 707             if (s->ac_pred)
 708                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);
 709         }
 710
 711         /* apply AC prediction if needed */
 712         if (s->ac_pred) {
 713             if (dc_pred_dir) { //left
 714                 for (k = 1; k < 8; k++) {
 715                     block[k << v->left_blk_sh] = ac_val[k] * scale;
 716                     if (!v->pquantizer && block[k << v->left_blk_sh])
 717                         block[k << v->left_blk_sh] += (block[k << v->left_blk_sh] < 0) ? -v->pq : v->pq;
 718                 }
 719             } else { // top
 720                 for (k = 1; k < 8; k++) {
 721                     block[k << v->top_blk_sh] = ac_val[k + 8] * scale;
 722                     if (!v->pquantizer && block[k << v->top_blk_sh])
 723                         block[k << v->top_blk_sh] += (block[k << v->top_blk_sh] < 0) ? -v->pq : v->pq;
 724                 }
 725             }
 726             i = 63;
 727         }
 728     }
 729     s->block_last_index[n] = i;
 730
 731     return 0;
 732 }
 733
 734 /** Decode intra block in intra frames - should be faster than decode_intra_block
 735  * @param v VC1Context
 736  * @param block block to decode
 737  * @param[in] n subblock number
 738  * @param coded are AC coeffs present or not
 739  * @param codingset set of VLC to decode data
 740  * @param mquant quantizer value for this macroblock
 741  */
 742 static int vc1_decode_i_block_adv(VC1Context *v, int16_t block[64], int n,
 743                                   int coded, int codingset, int mquant)
 744 {
 745     GetBitContext *gb = &v->s.gb;
 746     MpegEncContext *s = &v->s;
 747     int dc_pred_dir = 0; /* Direction of the DC prediction used */
 748     int i;
 749     int16_t *dc_val = NULL;
 750     int16_t *ac_val, *ac_val2;
 751     int dcdiff;
 752     int a_avail = v->a_avail, c_avail = v->c_avail;
 753     int use_pred = s->ac_pred;
 754     int scale;
 755     int q1, q2 = 0;
 756     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
 757
 758     /* Get DC differential */
 759     if (n < 4) {
 760         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);
 761     } else {
 762         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);
 763     }
 764     if (dcdiff < 0) {
 765         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");
 766         return -1;
 767     }
 768     if (dcdiff) {
 769         if (dcdiff == 119 /* ESC index value */) {
 770             /* TODO: Optimize */
 771             if (mquant == 1)      dcdiff = get_bits(gb, 10);
 772             else if (mquant == 2) dcdiff = get_bits(gb, 9);
 773             else                  dcdiff = get_bits(gb, 8);
 774         } else {
 775             if (mquant == 1)
 776                 dcdiff = (dcdiff << 2) + get_bits(gb, 2) - 3;
 777             else if (mquant == 2)
 778                 dcdiff = (dcdiff << 1) + get_bits1(gb)   - 1;
 779         }
 780         if (get_bits1(gb))
 781             dcdiff = -dcdiff;
 782     }
 783
 784     /* Prediction */
 785     dcdiff += ff_vc1_pred_dc(&v->s, v->overlap, mquant, n, v->a_avail, v->c_avail, &dc_val, &dc_pred_dir);
 786     *dc_val = dcdiff;
 787
 788     /* Store the quantized DC coeff, used for prediction */
 789     if (n < 4) {
 790         block[0] = dcdiff * s->y_dc_scale;
 791     } else {
 792         block[0] = dcdiff * s->c_dc_scale;
 793     }
 794
 795     //AC Decoding
 796     i = 1;
 797
 798     /* check if AC is needed at all */
 799     if (!a_avail && !c_avail)
 800         use_pred = 0;
 801     ac_val  = s->ac_val[0][0] + s->block_index[n] * 16;
 802     ac_val2 = ac_val;
 803
 804     scale = mquant * 2 + ((mquant == v->pq) ? v->halfpq : 0);
 805
 806     if (dc_pred_dir) // left
 807         ac_val -= 16;
 808     else // top
 809         ac_val -= 16 * s->block_wrap[n];
 810
 811     q1 = s->current_picture.qscale_table[mb_pos];
 812     if ( dc_pred_dir && c_avail && mb_pos)
 813         q2 = s->current_picture.qscale_table[mb_pos - 1];
 814     if (!dc_pred_dir && a_avail && mb_pos >= s->mb_stride)
 815         q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];
 816     if ( dc_pred_dir && n == 1)
 817         q2 = q1;
 818     if (!dc_pred_dir && n == 2)
 819         q2 = q1;
 820     if (n == 3)
 821         q2 = q1;
 822
 823     if (coded) {
 824         int last = 0, skip, value;
 825         const uint8_t *zz_table;
 826         int k;
 827
 828         if (v->s.ac_pred) {
 829             if (!use_pred && v->fcm == ILACE_FRAME) {
 830                 zz_table = v->zzi_8x8;
 831             } else {
 832                 if (!dc_pred_dir) // top
 833                     zz_table = v->zz_8x8[2];
 834                 else // left
 835                     zz_table = v->zz_8x8[3];
 836             }
 837         } else {
 838             if (v->fcm != ILACE_FRAME)
 839                 zz_table = v->zz_8x8[1];
 840             else
 841                 zz_table = v->zzi_8x8;
 842         }
 843
 844         while (!last) {
 845             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);
 846             i += skip;
 847             if (i > 63)
 848                 break;
 849             block[zz_table[i++]] = value;
 850         }
 851
 852         /* apply AC prediction if needed */
 853         if (use_pred) {
 854             /* scale predictors if needed*/
 855             if (q2 && q1 != q2) {
 856                 q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;
 857                 q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;
 858
 859                 if (q1 < 1)
 860                     return AVERROR_INVALIDDATA;
 861                 if (dc_pred_dir) { // left
 862                     for (k = 1; k < 8; k++)
 863                         block[k << v->left_blk_sh] += (ac_val[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;
 864                 } else { // top
 865                     for (k = 1; k < 8; k++)
 866                         block[k << v->top_blk_sh] += (ac_val[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;
 867                 }
 868             } else {
 869                 if (dc_pred_dir) { //left
 870                     for (k = 1; k < 8; k++)
 871                         block[k << v->left_blk_sh] += ac_val[k];
 872                 } else { //top
 873                     for (k = 1; k < 8; k++)
 874                         block[k << v->top_blk_sh] += ac_val[k + 8];
 875                 }
 876             }
 877         }
 878         /* save AC coeffs for further prediction */
 879         for (k = 1; k < 8; k++) {
 880             ac_val2[k    ] = block[k << v->left_blk_sh];
 881             ac_val2[k + 8] = block[k << v->top_blk_sh];
 882         }
 883
 884         /* scale AC coeffs */
 885         for (k = 1; k < 64; k++)
 886             if (block[k]) {
 887                 block[k] *= scale;
 888                 if (!v->pquantizer)
 889                     block[k] += (block[k] < 0) ? -mquant : mquant;
 890             }
 891
 892         if (use_pred) i = 63;
 893     } else { // no AC coeffs
 894         int k;
 895
 896         memset(ac_val2, 0, 16 * 2);
 897         if (dc_pred_dir) { // left
 898             if (use_pred) {
 899                 memcpy(ac_val2, ac_val, 8 * 2);
 900                 if (q2 && q1 != q2) {
 901                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;
 902                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;
 903                     if (q1 < 1)
 904                         return AVERROR_INVALIDDATA;
 905                     for (k = 1; k < 8; k++)
 906                         ac_val2[k] = (ac_val2[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;
 907                 }
 908             }
 909         } else { // top
 910             if (use_pred) {
 911                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);
 912                 if (q2 && q1 != q2) {
 913                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;
 914                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;
 915                     if (q1 < 1)
 916                         return AVERROR_INVALIDDATA;
 917                     for (k = 1; k < 8; k++)
 918                         ac_val2[k + 8] = (ac_val2[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;
 919                 }
 920             }
 921         }
 922
 923         /* apply AC prediction if needed */
 924         if (use_pred) {
 925             if (dc_pred_dir) { // left
 926                 for (k = 1; k < 8; k++) {
 927                     block[k << v->left_blk_sh] = ac_val2[k] * scale;
 928                     if (!v->pquantizer && block[k << v->left_blk_sh])
 929                         block[k << v->left_blk_sh] += (block[k << v->left_blk_sh] < 0) ? -mquant : mquant;
 930                 }
 931             } else { // top
 932                 for (k = 1; k < 8; k++) {
 933                     block[k << v->top_blk_sh] = ac_val2[k + 8] * scale;
 934                     if (!v->pquantizer && block[k << v->top_blk_sh])
 935                         block[k << v->top_blk_sh] += (block[k << v->top_blk_sh] < 0) ? -mquant : mquant;
 936                 }
 937             }
 938             i = 63;
 939         }
 940     }
 941     s->block_last_index[n] = i;
 942
 943     return 0;
 944 }
 945
 946 /** Decode intra block in inter frames - more generic version than vc1_decode_i_block
 947  * @param v VC1Context
 948  * @param block block to decode
 949  * @param[in] n subblock index
 950  * @param coded are AC coeffs present or not
 951  * @param mquant block quantizer
 952  * @param codingset set of VLC to decode data
 953  */
 954 static int vc1_decode_intra_block(VC1Context *v, int16_t block[64], int n,
 955                                   int coded, int mquant, int codingset)
 956 {
 957     GetBitContext *gb = &v->s.gb;
 958     MpegEncContext *s = &v->s;
 959     int dc_pred_dir = 0; /* Direction of the DC prediction used */
 960     int i;
 961     int16_t *dc_val = NULL;
 962     int16_t *ac_val, *ac_val2;
 963     int dcdiff;
 964     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
 965     int a_avail = v->a_avail, c_avail = v->c_avail;
 966     int use_pred = s->ac_pred;
 967     int scale;
 968     int q1, q2 = 0;
 969
 970     s->bdsp.clear_block(block);
 971
 972     /* XXX: Guard against dumb values of mquant */
 973     mquant = (mquant < 1) ? 0 : ((mquant > 31) ? 31 : mquant);
 974
 975     /* Set DC scale - y and c use the same */
 976     s->y_dc_scale = s->y_dc_scale_table[mquant];
 977     s->c_dc_scale = s->c_dc_scale_table[mquant];
 978
 979     /* Get DC differential */
 980     if (n < 4) {
 981         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);
 982     } else {
 983         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);
 984     }
 985     if (dcdiff < 0) {
 986         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");
 987         return -1;
 988     }
 989     if (dcdiff) {
 990         if (dcdiff == 119 /* ESC index value */) {
 991             /* TODO: Optimize */
 992             if (mquant == 1)      dcdiff = get_bits(gb, 10);
 993             else if (mquant == 2) dcdiff = get_bits(gb, 9);
 994             else                  dcdiff = get_bits(gb, 8);
 995         } else {
 996             if (mquant == 1)
 997                 dcdiff = (dcdiff << 2) + get_bits(gb, 2) - 3;
 998             else if (mquant == 2)
 999                 dcdiff = (dcdiff << 1) + get_bits1(gb)   - 1;
1000         }
1001         if (get_bits1(gb))
1002             dcdiff = -dcdiff;
1003     }
1004
1005     /* Prediction */
1006     dcdiff += ff_vc1_pred_dc(&v->s, v->overlap, mquant, n, a_avail, c_avail, &dc_val, &dc_pred_dir);
1007     *dc_val = dcdiff;
1008
1009     /* Store the quantized DC coeff, used for prediction */
1010
1011     if (n < 4) {
1012         block[0] = dcdiff * s->y_dc_scale;
1013     } else {
1014         block[0] = dcdiff * s->c_dc_scale;
1015     }
1016
1017     //AC Decoding
1018     i = 1;
1019
1020     /* check if AC is needed at all and adjust direction if needed */
1021     if (!a_avail) dc_pred_dir = 1;
1022     if (!c_avail) dc_pred_dir = 0;
1023     if (!a_avail && !c_avail) use_pred = 0;
1024     ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
1025     ac_val2 = ac_val;
1026
1027     scale = mquant * 2 + v->halfpq;
1028
1029     if (dc_pred_dir) //left
1030         ac_val -= 16;
1031     else //top
1032         ac_val -= 16 * s->block_wrap[n];
1033
1034     q1 = s->current_picture.qscale_table[mb_pos];
1035     if (dc_pred_dir && c_avail && mb_pos)
1036         q2 = s->current_picture.qscale_table[mb_pos - 1];
1037     if (!dc_pred_dir && a_avail && mb_pos >= s->mb_stride)
1038         q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];
1039     if ( dc_pred_dir && n == 1)
1040         q2 = q1;
1041     if (!dc_pred_dir && n == 2)
1042         q2 = q1;
1043     if (n == 3) q2 = q1;
1044
1045     if (coded) {
1046         int last = 0, skip, value;
1047         int k;
1048
1049         while (!last) {
1050             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);
1051             i += skip;
1052             if (i > 63)
1053                 break;
1054             if (v->fcm == PROGRESSIVE)
1055                 block[v->zz_8x8[0][i++]] = value;
1056             else {
1057                 if (use_pred && (v->fcm == ILACE_FRAME)) {
1058                     if (!dc_pred_dir) // top
1059                         block[v->zz_8x8[2][i++]] = value;
1060                     else // left
1061                         block[v->zz_8x8[3][i++]] = value;
1062                 } else {
1063                     block[v->zzi_8x8[i++]] = value;
1064                 }
1065             }
1066         }
1067
1068         /* apply AC prediction if needed */
1069         if (use_pred) {
1070             /* scale predictors if needed*/
1071             if (q2 && q1 != q2) {
1072                 q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;
1073                 q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;
1074
1075                 if (q1 < 1)
1076                     return AVERROR_INVALIDDATA;
1077                 if (dc_pred_dir) { // left
1078                     for (k = 1; k < 8; k++)
1079                         block[k << v->left_blk_sh] += (ac_val[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;
1080                 } else { //top
1081                     for (k = 1; k < 8; k++)
1082                         block[k << v->top_blk_sh] += (ac_val[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;
1083                 }
1084             } else {
1085                 if (dc_pred_dir) { // left
1086                     for (k = 1; k < 8; k++)
1087                         block[k << v->left_blk_sh] += ac_val[k];
1088                 } else { // top
1089                     for (k = 1; k < 8; k++)
1090                         block[k << v->top_blk_sh] += ac_val[k + 8];
1091                 }
1092             }
1093         }
1094         /* save AC coeffs for further prediction */
1095         for (k = 1; k < 8; k++) {
1096             ac_val2[k    ] = block[k << v->left_blk_sh];
1097             ac_val2[k + 8] = block[k << v->top_blk_sh];
1098         }
1099
1100         /* scale AC coeffs */
1101         for (k = 1; k < 64; k++)
1102             if (block[k]) {
1103                 block[k] *= scale;
1104                 if (!v->pquantizer)
1105                     block[k] += (block[k] < 0) ? -mquant : mquant;
1106             }
1107
1108         if (use_pred) i = 63;
1109     } else { // no AC coeffs
1110         int k;
1111
1112         memset(ac_val2, 0, 16 * 2);
1113         if (dc_pred_dir) { // left
1114             if (use_pred) {
1115                 memcpy(ac_val2, ac_val, 8 * 2);
1116                 if (q2 && q1 != q2) {
1117                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;
1118                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;
1119                     if (q1 < 1)
1120                         return AVERROR_INVALIDDATA;
1121                     for (k = 1; k < 8; k++)
1122                         ac_val2[k] = (ac_val2[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;
1123                 }
1124             }
1125         } else { // top
1126             if (use_pred) {
1127                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);
1128                 if (q2 && q1 != q2) {
1129                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;
1130                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;
1131                     if (q1 < 1)
1132                         return AVERROR_INVALIDDATA;
1133                     for (k = 1; k < 8; k++)
1134                         ac_val2[k + 8] = (ac_val2[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;
1135                 }
1136             }
1137         }
1138
1139         /* apply AC prediction if needed */
1140         if (use_pred) {
1141             if (dc_pred_dir) { // left
1142                 for (k = 1; k < 8; k++) {
1143                     block[k << v->left_blk_sh] = ac_val2[k] * scale;
1144                     if (!v->pquantizer && block[k << v->left_blk_sh])
1145                         block[k << v->left_blk_sh] += (block[k << v->left_blk_sh] < 0) ? -mquant : mquant;
1146                 }
1147             } else { // top
1148                 for (k = 1; k < 8; k++) {
1149                     block[k << v->top_blk_sh] = ac_val2[k + 8] * scale;
1150                     if (!v->pquantizer && block[k << v->top_blk_sh])
1151                         block[k << v->top_blk_sh] += (block[k << v->top_blk_sh] < 0) ? -mquant : mquant;
1152                 }
1153             }
1154             i = 63;
1155         }
1156     }
1157     s->block_last_index[n] = i;
1158
1159     return 0;
1160 }
1161
1162 /** Decode P block
1163  */
1164 static int vc1_decode_p_block(VC1Context *v, int16_t block[64], int n,
1165                               int mquant, int ttmb, int first_block,
1166                               uint8_t *dst, int linesize, int skip_block,
1167                               int *ttmb_out)
1168 {
1169     MpegEncContext *s = &v->s;
1170     GetBitContext *gb = &s->gb;
1171     int i, j;
1172     int subblkpat = 0;
1173     int scale, off, idx, last, skip, value;
1174     int ttblk = ttmb & 7;
1175     int pat = 0;
1176
1177     s->bdsp.clear_block(block);
1178
1179     if (ttmb == -1) {
1180         ttblk = ff_vc1_ttblk_to_tt[v->tt_index][get_vlc2(gb, ff_vc1_ttblk_vlc[v->tt_index].table, VC1_TTBLK_VLC_BITS, 1)];
1181     }
1182     if (ttblk == TT_4X4) {
1183         subblkpat = ~(get_vlc2(gb, ff_vc1_subblkpat_vlc[v->tt_index].table, VC1_SUBBLKPAT_VLC_BITS, 1) + 1);
1184     }
1185     if ((ttblk != TT_8X8 && ttblk != TT_4X4)
1186         && ((v->ttmbf || (ttmb != -1 && (ttmb & 8) && !first_block))
1187             || (!v->res_rtm_flag && !first_block))) {
1188         subblkpat = decode012(gb);
1189         if (subblkpat)
1190             subblkpat ^= 3; // swap decoded pattern bits
1191         if (ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM)
1192             ttblk = TT_8X4;
1193         if (ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT)
1194             ttblk = TT_4X8;
1195     }
1196     scale = 2 * mquant + ((v->pq == mquant) ? v->halfpq : 0);
1197
1198     // convert transforms like 8X4_TOP to generic TT and SUBBLKPAT
1199     if (ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM) {
1200         subblkpat = 2 - (ttblk == TT_8X4_TOP);
1201         ttblk     = TT_8X4;
1202     }
1203     if (ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT) {
1204         subblkpat = 2 - (ttblk == TT_4X8_LEFT);
1205         ttblk     = TT_4X8;
1206     }
1207     switch (ttblk) {
1208     case TT_8X8:
1209         pat  = 0xF;
1210         i    = 0;
1211         last = 0;
1212         while (!last) {
1213             vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);
1214             i += skip;
1215             if (i > 63)
1216                 break;
1217             if (!v->fcm)
1218                 idx = v->zz_8x8[0][i++];
1219             else
1220                 idx = v->zzi_8x8[i++];
1221             block[idx] = value * scale;
1222             if (!v->pquantizer)
1223                 block[idx] += (block[idx] < 0) ? -mquant : mquant;
1224         }
1225         if (!skip_block) {
1226             if (i == 1)
1227                 v->vc1dsp.vc1_inv_trans_8x8_dc(dst, linesize, block);
1228             else {
1229                 v->vc1dsp.vc1_inv_trans_8x8(block);
1230                 s->idsp.add_pixels_clamped(block, dst, linesize);
1231             }
1232         }
1233         break;
1234     case TT_4X4:
1235         pat = ~subblkpat & 0xF;
1236         for (j = 0; j < 4; j++) {
1237             last = subblkpat & (1 << (3 - j));
1238             i    = 0;
1239             off  = (j & 1) * 4 + (j & 2) * 16;
1240             while (!last) {
1241                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);
1242                 i += skip;
1243                 if (i > 15)
1244                     break;
1245                 if (!v->fcm)
1246                     idx = ff_vc1_simple_progressive_4x4_zz[i++];
1247                 else
1248                     idx = ff_vc1_adv_interlaced_4x4_zz[i++];
1249                 block[idx + off] = value * scale;
1250                 if (!v->pquantizer)
1251                     block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;
1252             }
1253             if (!(subblkpat & (1 << (3 - j))) && !skip_block) {
1254                 if (i == 1)
1255                     v->vc1dsp.vc1_inv_trans_4x4_dc(dst + (j & 1) * 4 + (j & 2) * 2 * linesize, linesize, block + off);
1256                 else
1257                     v->vc1dsp.vc1_inv_trans_4x4(dst + (j & 1) * 4 + (j & 2) *  2 * linesize, linesize, block + off);
1258             }
1259         }
1260         break;
1261     case TT_8X4:
1262         pat = ~((subblkpat & 2) * 6 + (subblkpat & 1) * 3) & 0xF;
1263         for (j = 0; j < 2; j++) {
1264             last = subblkpat & (1 << (1 - j));
1265             i    = 0;
1266             off  = j * 32;
1267             while (!last) {
1268                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);
1269                 i += skip;
1270                 if (i > 31)
1271                     break;
1272                 if (!v->fcm)
1273                     idx = v->zz_8x4[i++] + off;
1274                 else
1275                     idx = ff_vc1_adv_interlaced_8x4_zz[i++] + off;
1276                 block[idx] = value * scale;
1277                 if (!v->pquantizer)
1278                     block[idx] += (block[idx] < 0) ? -mquant : mquant;
1279             }
1280             if (!(subblkpat & (1 << (1 - j))) && !skip_block) {
1281                 if (i == 1)
1282                     v->vc1dsp.vc1_inv_trans_8x4_dc(dst + j * 4 * linesize, linesize, block + off);
1283                 else
1284                     v->vc1dsp.vc1_inv_trans_8x4(dst + j * 4 * linesize, linesize, block + off);
1285             }
1286         }
1287         break;
1288     case TT_4X8:
1289         pat = ~(subblkpat * 5) & 0xF;
1290         for (j = 0; j < 2; j++) {
1291             last = subblkpat & (1 << (1 - j));
1292             i    = 0;
1293             off  = j * 4;
1294             while (!last) {
1295                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);
1296                 i += skip;
1297                 if (i > 31)
1298                     break;
1299                 if (!v->fcm)
1300                     idx = v->zz_4x8[i++] + off;
1301                 else
1302                     idx = ff_vc1_adv_interlaced_4x8_zz[i++] + off;
1303                 block[idx] = value * scale;
1304                 if (!v->pquantizer)
1305                     block[idx] += (block[idx] < 0) ? -mquant : mquant;
1306             }
1307             if (!(subblkpat & (1 << (1 - j))) && !skip_block) {
1308                 if (i == 1)
1309                     v->vc1dsp.vc1_inv_trans_4x8_dc(dst + j * 4, linesize, block + off);
1310                 else
1311                     v->vc1dsp.vc1_inv_trans_4x8(dst + j*4, linesize, block + off);
1312             }
1313         }
1314         break;
1315     }
1316     if (ttmb_out)
1317         *ttmb_out |= ttblk << (n * 4);
1318     return pat;
1319 }
1320
1321 /** @} */ // Macroblock group
1322
1323 static const int size_table  [6] = { 0, 2, 3, 4,  5,  8 };
1324 static const int offset_table[6] = { 0, 1, 3, 7, 15, 31 };
1325
1326 /** Decode one P-frame MB
1327  */
1328 static int vc1_decode_p_mb(VC1Context *v)
1329 {
1330     MpegEncContext *s = &v->s;
1331     GetBitContext *gb = &s->gb;
1332     int i, j;
1333     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
1334     int cbp; /* cbp decoding stuff */
1335     int mqdiff, mquant; /* MB quantization */
1336     int ttmb = v->ttfrm; /* MB Transform type */
1337
1338     int mb_has_coeffs = 1; /* last_flag */
1339     int dmv_x, dmv_y; /* Differential MV components */
1340     int index, index1; /* LUT indexes */
1341     int val, sign; /* temp values */
1342     int first_block = 1;
1343     int dst_idx, off;
1344     int skipped, fourmv;
1345     int block_cbp = 0, pat, block_tt = 0, block_intra = 0;
1346
1347     mquant = v->pq; /* lossy initialization */
1348
1349     if (v->mv_type_is_raw)
1350         fourmv = get_bits1(gb);
1351     else
1352         fourmv = v->mv_type_mb_plane[mb_pos];
1353     if (v->skip_is_raw)
1354         skipped = get_bits1(gb);
1355     else
1356         skipped = v->s.mbskip_table[mb_pos];
1357
1358     if (!fourmv) { /* 1MV mode */
1359         if (!skipped) {
1360             GET_MVDATA(dmv_x, dmv_y);
1361
1362             if (s->mb_intra) {
1363                 s->current_picture.motion_val[1][s->block_index[0]][0] = 0;
1364                 s->current_picture.motion_val[1][s->block_index[0]][1] = 0;
1365             }
1366             s->current_picture.mb_type[mb_pos] = s->mb_intra ? MB_TYPE_INTRA : MB_TYPE_16x16;
1367             ff_vc1_pred_mv(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], 0, 0);
1368
1369             /* FIXME Set DC val for inter block ? */
1370             if (s->mb_intra && !mb_has_coeffs) {
1371                 GET_MQUANT();
1372                 s->ac_pred = get_bits1(gb);
1373                 cbp        = 0;
1374             } else if (mb_has_coeffs) {
1375                 if (s->mb_intra)
1376                     s->ac_pred = get_bits1(gb);
1377                 cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);
1378                 GET_MQUANT();
1379             } else {
1380                 mquant = v->pq;
1381                 cbp    = 0;
1382             }
1383             s->current_picture.qscale_table[mb_pos] = mquant;
1384
1385             if (!v->ttmbf && !s->mb_intra && mb_has_coeffs)
1386                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table,
1387                                 VC1_TTMB_VLC_BITS, 2);
1388             if (!s->mb_intra) ff_vc1_mc_1mv(v, 0);
1389             dst_idx = 0;
1390             for (i = 0; i < 6; i++) {
1391                 s->dc_val[0][s->block_index[i]] = 0;
1392                 dst_idx += i >> 2;
1393                 val = ((cbp >> (5 - i)) & 1);
1394                 off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);
1395                 v->mb_type[0][s->block_index[i]] = s->mb_intra;
1396                 if (s->mb_intra) {
1397                     /* check if prediction blocks A and C are available */
1398                     v->a_avail = v->c_avail = 0;
1399                     if (i == 2 || i == 3 || !s->first_slice_line)
1400                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];
1401                     if (i == 1 || i == 3 || s->mb_x)
1402                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];
1403
1404                     vc1_decode_intra_block(v, s->block[i], i, val, mquant,
1405                                            (i & 4) ? v->codingset2 : v->codingset);
1406                     if ((i>3) && (s->flags & CODEC_FLAG_GRAY))
1407                         continue;
1408                     v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);
1409                     if (v->rangeredfrm)
1410                         for (j = 0; j < 64; j++)
1411                             s->block[i][j] <<= 1;
1412                     s->idsp.put_signed_pixels_clamped(s->block[i],
1413                                                       s->dest[dst_idx] + off,
1414                                                       i & 4 ? s->uvlinesize
1415                                                             : s->linesize);
1416                     if (v->pq >= 9 && v->overlap) {
1417                         if (v->c_avail)
1418                             v->vc1dsp.vc1_h_overlap(s->dest[dst_idx] + off, i & 4 ? s->uvlinesize : s->linesize);
1419                         if (v->a_avail)
1420                             v->vc1dsp.vc1_v_overlap(s->dest[dst_idx] + off, i & 4 ? s->uvlinesize : s->linesize);
1421                     }
1422                     block_cbp   |= 0xF << (i << 2);
1423                     block_intra |= 1 << i;
1424                 } else if (val) {
1425                     pat = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block,
1426                                              s->dest[dst_idx] + off, (i & 4) ? s->uvlinesize : s->linesize,
1427                                              (i & 4) && (s->flags & CODEC_FLAG_GRAY), &block_tt);
1428                     block_cbp |= pat << (i << 2);
1429                     if (!v->ttmbf && ttmb < 8)
1430                         ttmb = -1;
1431                     first_block = 0;
1432                 }
1433             }
1434         } else { // skipped
1435             s->mb_intra = 0;
1436             for (i = 0; i < 6; i++) {
1437                 v->mb_type[0][s->block_index[i]] = 0;
1438                 s->dc_val[0][s->block_index[i]]  = 0;
1439             }
1440             s->current_picture.mb_type[mb_pos]      = MB_TYPE_SKIP;
1441             s->current_picture.qscale_table[mb_pos] = 0;
1442             ff_vc1_pred_mv(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0], 0, 0);
1443             ff_vc1_mc_1mv(v, 0);
1444         }
1445     } else { // 4MV mode
1446         if (!skipped /* unskipped MB */) {
1447             int intra_count = 0, coded_inter = 0;
1448             int is_intra[6], is_coded[6];
1449             /* Get CBPCY */
1450             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);
1451             for (i = 0; i < 6; i++) {
1452                 val = ((cbp >> (5 - i)) & 1);
1453                 s->dc_val[0][s->block_index[i]] = 0;
1454                 s->mb_intra                     = 0;
1455                 if (i < 4) {
1456                     dmv_x = dmv_y = 0;
1457                     s->mb_intra   = 0;
1458                     mb_has_coeffs = 0;
1459                     if (val) {
1460                         GET_MVDATA(dmv_x, dmv_y);
1461                     }
1462                     ff_vc1_pred_mv(v, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0], 0, 0);
1463                     if (!s->mb_intra)
1464                         ff_vc1_mc_4mv_luma(v, i, 0, 0);
1465                     intra_count += s->mb_intra;
1466                     is_intra[i]  = s->mb_intra;
1467                     is_coded[i]  = mb_has_coeffs;
1468                 }
1469                 if (i & 4) {
1470                     is_intra[i] = (intra_count >= 3);
1471                     is_coded[i] = val;
1472                 }
1473                 if (i == 4)
1474                     ff_vc1_mc_4mv_chroma(v, 0);
1475                 v->mb_type[0][s->block_index[i]] = is_intra[i];
1476                 if (!coded_inter)
1477                     coded_inter = !is_intra[i] & is_coded[i];
1478             }
1479             // if there are no coded blocks then don't do anything more
1480             dst_idx = 0;
1481             if (!intra_count && !coded_inter)
1482                 goto end;
1483             GET_MQUANT();
1484             s->current_picture.qscale_table[mb_pos] = mquant;
1485             /* test if block is intra and has pred */
1486             {
1487                 int intrapred = 0;
1488                 for (i = 0; i < 6; i++)
1489                     if (is_intra[i]) {
1490                         if (((!s->first_slice_line || (i == 2 || i == 3)) && v->mb_type[0][s->block_index[i] - s->block_wrap[i]])
1491                             || ((s->mb_x || (i == 1 || i == 3)) && v->mb_type[0][s->block_index[i] - 1])) {
1492                             intrapred = 1;
1493                             break;
1494                         }
1495                     }
1496                 if (intrapred)
1497                     s->ac_pred = get_bits1(gb);
1498                 else
1499                     s->ac_pred = 0;
1500             }
1501             if (!v->ttmbf && coded_inter)
1502                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);
1503             for (i = 0; i < 6; i++) {
1504                 dst_idx    += i >> 2;
1505                 off         = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);
1506                 s->mb_intra = is_intra[i];
1507                 if (is_intra[i]) {
1508                     /* check if prediction blocks A and C are available */
1509                     v->a_avail = v->c_avail = 0;
1510                     if (i == 2 || i == 3 || !s->first_slice_line)
1511                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];
1512                     if (i == 1 || i == 3 || s->mb_x)
1513                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];
1514
1515                     vc1_decode_intra_block(v, s->block[i], i, is_coded[i], mquant,
1516                                            (i & 4) ? v->codingset2 : v->codingset);
1517                     if ((i>3) && (s->flags & CODEC_FLAG_GRAY))
1518                         continue;
1519                     v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);
1520                     if (v->rangeredfrm)
1521                         for (j = 0; j < 64; j++)
1522                             s->block[i][j] <<= 1;
1523                     s->idsp.put_signed_pixels_clamped(s->block[i],
1524                                                       s->dest[dst_idx] + off,
1525                                                       (i & 4) ? s->uvlinesize
1526                                                               : s->linesize);
1527                     if (v->pq >= 9 && v->overlap) {
1528                         if (v->c_avail)
1529                             v->vc1dsp.vc1_h_overlap(s->dest[dst_idx] + off, i & 4 ? s->uvlinesize : s->linesize);
1530                         if (v->a_avail)
1531                             v->vc1dsp.vc1_v_overlap(s->dest[dst_idx] + off, i & 4 ? s->uvlinesize : s->linesize);
1532                     }
1533                     block_cbp   |= 0xF << (i << 2);
1534                     block_intra |= 1 << i;
1535                 } else if (is_coded[i]) {
1536                     pat = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,
1537                                              first_block, s->dest[dst_idx] + off,
1538                                              (i & 4) ? s->uvlinesize : s->linesize,
1539                                              (i & 4) && (s->flags & CODEC_FLAG_GRAY),
1540                                              &block_tt);
1541                     block_cbp |= pat << (i << 2);
1542                     if (!v->ttmbf && ttmb < 8)
1543                         ttmb = -1;
1544                     first_block = 0;
1545                 }
1546             }
1547         } else { // skipped MB
1548             s->mb_intra                               = 0;
1549             s->current_picture.qscale_table[mb_pos] = 0;
1550             for (i = 0; i < 6; i++) {
1551                 v->mb_type[0][s->block_index[i]] = 0;
1552                 s->dc_val[0][s->block_index[i]]  = 0;
1553             }
1554             for (i = 0; i < 4; i++) {
1555                 ff_vc1_pred_mv(v, i, 0, 0, 0, v->range_x, v->range_y, v->mb_type[0], 0, 0);
1556                 ff_vc1_mc_4mv_luma(v, i, 0, 0);
1557             }
1558             ff_vc1_mc_4mv_chroma(v, 0);
1559             s->current_picture.qscale_table[mb_pos] = 0;
1560         }
1561     }
1562 end:
1563     v->cbp[s->mb_x]      = block_cbp;
1564     v->ttblk[s->mb_x]    = block_tt;
1565     v->is_intra[s->mb_x] = block_intra;
1566
1567     return 0;
1568 }
1569
1570 /* Decode one macroblock in an interlaced frame p picture */
1571
1572 static int vc1_decode_p_mb_intfr(VC1Context *v)
1573 {
1574     MpegEncContext *s = &v->s;
1575     GetBitContext *gb = &s->gb;
1576     int i;
1577     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
1578     int cbp = 0; /* cbp decoding stuff */
1579     int mqdiff, mquant; /* MB quantization */
1580     int ttmb = v->ttfrm; /* MB Transform type */
1581
1582     int mb_has_coeffs = 1; /* last_flag */
1583     int dmv_x, dmv_y; /* Differential MV components */
1584     int val; /* temp value */
1585     int first_block = 1;
1586     int dst_idx, off;
1587     int skipped, fourmv = 0, twomv = 0;
1588     int block_cbp = 0, pat, block_tt = 0;
1589     int idx_mbmode = 0, mvbp;
1590     int stride_y, fieldtx;
1591
1592     mquant = v->pq; /* Lossy initialization */
1593
1594     if (v->skip_is_raw)
1595         skipped = get_bits1(gb);
1596     else
1597         skipped = v->s.mbskip_table[mb_pos];
1598     if (!skipped) {
1599         if (v->fourmvswitch)
1600             idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_INTFR_4MV_MBMODE_VLC_BITS, 2); // try getting this done
1601         else
1602             idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_INTFR_NON4MV_MBMODE_VLC_BITS, 2); // in a single line
1603         switch (ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0]) {
1604         /* store the motion vector type in a flag (useful later) */
1605         case MV_PMODE_INTFR_4MV:
1606             fourmv = 1;
1607             v->blk_mv_type[s->block_index[0]] = 0;
1608             v->blk_mv_type[s->block_index[1]] = 0;
1609             v->blk_mv_type[s->block_index[2]] = 0;
1610             v->blk_mv_type[s->block_index[3]] = 0;
1611             break;
1612         case MV_PMODE_INTFR_4MV_FIELD:
1613             fourmv = 1;
1614             v->blk_mv_type[s->block_index[0]] = 1;
1615             v->blk_mv_type[s->block_index[1]] = 1;
1616             v->blk_mv_type[s->block_index[2]] = 1;
1617             v->blk_mv_type[s->block_index[3]] = 1;
1618             break;
1619         case MV_PMODE_INTFR_2MV_FIELD:
1620             twomv = 1;
1621             v->blk_mv_type[s->block_index[0]] = 1;
1622             v->blk_mv_type[s->block_index[1]] = 1;
1623             v->blk_mv_type[s->block_index[2]] = 1;
1624             v->blk_mv_type[s->block_index[3]] = 1;
1625             break;
1626         case MV_PMODE_INTFR_1MV:
1627             v->blk_mv_type[s->block_index[0]] = 0;
1628             v->blk_mv_type[s->block_index[1]] = 0;
1629             v->blk_mv_type[s->block_index[2]] = 0;
1630             v->blk_mv_type[s->block_index[3]] = 0;
1631             break;
1632         }
1633         if (ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0] == MV_PMODE_INTFR_INTRA) { // intra MB
1634             for (i = 0; i < 4; i++) {
1635                 s->current_picture.motion_val[1][s->block_index[i]][0] = 0;
1636                 s->current_picture.motion_val[1][s->block_index[i]][1] = 0;
1637             }
1638             v->is_intra[s->mb_x] = 0x3f; // Set the bitfield to all 1.
1639             s->mb_intra          = 1;
1640             s->current_picture.mb_type[mb_pos] = MB_TYPE_INTRA;
1641             fieldtx = v->fieldtx_plane[mb_pos] = get_bits1(gb);
1642             mb_has_coeffs = get_bits1(gb);
1643             if (mb_has_coeffs)
1644                 cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);
1645             v->s.ac_pred = v->acpred_plane[mb_pos] = get_bits1(gb);
1646             GET_MQUANT();
1647             s->current_picture.qscale_table[mb_pos] = mquant;
1648             /* Set DC scale - y and c use the same (not sure if necessary here) */
1649             s->y_dc_scale = s->y_dc_scale_table[mquant];
1650             s->c_dc_scale = s->c_dc_scale_table[mquant];
1651             dst_idx = 0;
1652             for (i = 0; i < 6; i++) {
1653                 v->a_avail = v->c_avail          = 0;
1654                 v->mb_type[0][s->block_index[i]] = 1;
1655                 s->dc_val[0][s->block_index[i]]  = 0;
1656                 dst_idx += i >> 2;
1657                 val = ((cbp >> (5 - i)) & 1);
1658                 if (i == 2 || i == 3 || !s->first_slice_line)
1659                     v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];
1660                 if (i == 1 || i == 3 || s->mb_x)
1661                     v->c_avail = v->mb_type[0][s->block_index[i] - 1];
1662
1663                 vc1_decode_intra_block(v, s->block[i], i, val, mquant,
1664                                        (i & 4) ? v->codingset2 : v->codingset);
1665                 if ((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;
1666                 v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);
1667                 if (i < 4) {
1668                     stride_y = s->linesize << fieldtx;
1669                     off = (fieldtx) ? ((i & 1) * 8) + ((i & 2) >> 1) * s->linesize : (i & 1) * 8 + 4 * (i & 2) * s->linesize;
1670                 } else {
1671                     stride_y = s->uvlinesize;
1672                     off = 0;
1673                 }
1674                 s->idsp.put_signed_pixels_clamped(s->block[i],
1675                                                   s->dest[dst_idx] + off,
1676                                                   stride_y);
1677                 //TODO: loop filter
1678             }
1679
1680         } else { // inter MB
1681             mb_has_coeffs = ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][3];
1682             if (mb_has_coeffs)
1683                 cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);
1684             if (ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0] == MV_PMODE_INTFR_2MV_FIELD) {
1685                 v->twomvbp = get_vlc2(gb, v->twomvbp_vlc->table, VC1_2MV_BLOCK_PATTERN_VLC_BITS, 1);
1686             } else {
1687                 if ((ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0] == MV_PMODE_INTFR_4MV)
1688                     || (ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0] == MV_PMODE_INTFR_4MV_FIELD)) {
1689                     v->fourmvbp = get_vlc2(gb, v->fourmvbp_vlc->table, VC1_4MV_BLOCK_PATTERN_VLC_BITS, 1);
1690                 }
1691             }
1692             s->mb_intra = v->is_intra[s->mb_x] = 0;
1693             for (i = 0; i < 6; i++)
1694                 v->mb_type[0][s->block_index[i]] = 0;
1695             fieldtx = v->fieldtx_plane[mb_pos] = ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][1];
1696             /* for all motion vector read MVDATA and motion compensate each block */
1697             dst_idx = 0;
1698             if (fourmv) {
1699                 mvbp = v->fourmvbp;
1700                 for (i = 0; i < 6; i++) {
1701                     if (i < 4) {
1702                         dmv_x = dmv_y = 0;
1703                         val   = ((mvbp >> (3 - i)) & 1);
1704                         if (val) {
1705                             get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);
1706                         }
1707                         ff_vc1_pred_mv_intfr(v, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0], 0);
1708                         ff_vc1_mc_4mv_luma(v, i, 0, 0);
1709                     } else if (i == 4) {
1710                         ff_vc1_mc_4mv_chroma4(v, 0, 0, 0);
1711                     }
1712                 }
1713             } else if (twomv) {
1714                 mvbp  = v->twomvbp;
1715                 dmv_x = dmv_y = 0;
1716                 if (mvbp & 2) {
1717                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);
1718                 }
1719                 ff_vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0], 0);
1720                 ff_vc1_mc_4mv_luma(v, 0, 0, 0);
1721                 ff_vc1_mc_4mv_luma(v, 1, 0, 0);
1722                 dmv_x = dmv_y = 0;
1723                 if (mvbp & 1) {
1724                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);
1725                 }
1726                 ff_vc1_pred_mv_intfr(v, 2, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0], 0);
1727                 ff_vc1_mc_4mv_luma(v, 2, 0, 0);
1728                 ff_vc1_mc_4mv_luma(v, 3, 0, 0);
1729                 ff_vc1_mc_4mv_chroma4(v, 0, 0, 0);
1730             } else {
1731                 mvbp = ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][2];
1732                 dmv_x = dmv_y = 0;
1733                 if (mvbp) {
1734                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);
1735                 }
1736                 ff_vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], 0);
1737                 ff_vc1_mc_1mv(v, 0);
1738             }
1739             if (cbp)
1740                 GET_MQUANT();  // p. 227
1741             s->current_picture.qscale_table[mb_pos] = mquant;
1742             if (!v->ttmbf && cbp)
1743                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);
1744             for (i = 0; i < 6; i++) {
1745                 s->dc_val[0][s->block_index[i]] = 0;
1746                 dst_idx += i >> 2;
1747                 val = ((cbp >> (5 - i)) & 1);
1748                 if (!fieldtx)
1749                     off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);
1750                 else
1751                     off = (i & 4) ? 0 : ((i & 1) * 8 + ((i > 1) * s->linesize));
1752                 if (val) {
1753                     pat = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,
1754                                              first_block, s->dest[dst_idx] + off,
1755                                              (i & 4) ? s->uvlinesize : (s->linesize << fieldtx),
1756                                              (i & 4) && (s->flags & CODEC_FLAG_GRAY), &block_tt);
1757                     block_cbp |= pat << (i << 2);
1758                     if (!v->ttmbf && ttmb < 8)
1759                         ttmb = -1;
1760                     first_block = 0;
1761                 }
1762             }
1763         }
1764     } else { // skipped
1765         s->mb_intra = v->is_intra[s->mb_x] = 0;
1766         for (i = 0; i < 6; i++) {
1767             v->mb_type[0][s->block_index[i]] = 0;
1768             s->dc_val[0][s->block_index[i]] = 0;
1769         }
1770         s->current_picture.mb_type[mb_pos]      = MB_TYPE_SKIP;
1771         s->current_picture.qscale_table[mb_pos] = 0;
1772         v->blk_mv_type[s->block_index[0]] = 0;
1773         v->blk_mv_type[s->block_index[1]] = 0;
1774         v->blk_mv_type[s->block_index[2]] = 0;
1775         v->blk_mv_type[s->block_index[3]] = 0;
1776         ff_vc1_pred_mv_intfr(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0], 0);
1777         ff_vc1_mc_1mv(v, 0);
1778     }
1779     if (s->mb_x == s->mb_width - 1)
1780         memmove(v->is_intra_base, v->is_intra, sizeof(v->is_intra_base[0])*s->mb_stride);
1781     return 0;
1782 }
1783
1784 static int vc1_decode_p_mb_intfi(VC1Context *v)
1785 {
1786     MpegEncContext *s = &v->s;
1787     GetBitContext *gb = &s->gb;
1788     int i;
1789     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
1790     int cbp = 0; /* cbp decoding stuff */
1791     int mqdiff, mquant; /* MB quantization */
1792     int ttmb = v->ttfrm; /* MB Transform type */
1793
1794     int mb_has_coeffs = 1; /* last_flag */
1795     int dmv_x, dmv_y; /* Differential MV components */
1796     int val; /* temp values */
1797     int first_block = 1;
1798     int dst_idx, off;
1799     int pred_flag = 0;
1800     int block_cbp = 0, pat, block_tt = 0;
1801     int idx_mbmode = 0;
1802
1803     mquant = v->pq; /* Lossy initialization */
1804
1805     idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_IF_MBMODE_VLC_BITS, 2);
1806     if (idx_mbmode <= 1) { // intra MB
1807         v->is_intra[s->mb_x] = 0x3f; // Set the bitfield to all 1.
1808         s->mb_intra          = 1;
1809         s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][0] = 0;
1810         s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][1] = 0;
1811         s->current_picture.mb_type[mb_pos + v->mb_off] = MB_TYPE_INTRA;
1812         GET_MQUANT();
1813         s->current_picture.qscale_table[mb_pos] = mquant;
1814         /* Set DC scale - y and c use the same (not sure if necessary here) */
1815         s->y_dc_scale = s->y_dc_scale_table[mquant];
1816         s->c_dc_scale = s->c_dc_scale_table[mquant];
1817         v->s.ac_pred  = v->acpred_plane[mb_pos] = get_bits1(gb);
1818         mb_has_coeffs = idx_mbmode & 1;
1819         if (mb_has_coeffs)
1820             cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_ICBPCY_VLC_BITS, 2);
1821         dst_idx = 0;
1822         for (i = 0; i < 6; i++) {
1823             v->a_avail = v->c_avail          = 0;
1824             v->mb_type[0][s->block_index[i]] = 1;
1825             s->dc_val[0][s->block_index[i]]  = 0;
1826             dst_idx += i >> 2;
1827             val = ((cbp >> (5 - i)) & 1);
1828             if (i == 2 || i == 3 || !s->first_slice_line)
1829                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];
1830             if (i == 1 || i == 3 || s->mb_x)
1831                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];
1832
1833             vc1_decode_intra_block(v, s->block[i], i, val, mquant,
1834                                    (i & 4) ? v->codingset2 : v->codingset);
1835             if ((i>3) && (s->flags & CODEC_FLAG_GRAY))
1836                 continue;
1837             v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);
1838             off  = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);
1839             s->idsp.put_signed_pixels_clamped(s->block[i],
1840                                               s->dest[dst_idx] + off,
1841                                               (i & 4) ? s->uvlinesize
1842                                                       : s->linesize);
1843             // TODO: loop filter
1844         }
1845     } else {
1846         s->mb_intra = v->is_intra[s->mb_x] = 0;
1847         s->current_picture.mb_type[mb_pos + v->mb_off] = MB_TYPE_16x16;
1848         for (i = 0; i < 6; i++) v->mb_type[0][s->block_index[i]] = 0;
1849         if (idx_mbmode <= 5) { // 1-MV
1850             dmv_x = dmv_y = pred_flag = 0;
1851             if (idx_mbmode & 1) {
1852                 get_mvdata_interlaced(v, &dmv_x, &dmv_y, &pred_flag);
1853             }
1854             ff_vc1_pred_mv(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], pred_flag, 0);
1855             ff_vc1_mc_1mv(v, 0);
1856             mb_has_coeffs = !(idx_mbmode & 2);
1857         } else { // 4-MV
1858             v->fourmvbp = get_vlc2(gb, v->fourmvbp_vlc->table, VC1_4MV_BLOCK_PATTERN_VLC_BITS, 1);
1859             for (i = 0; i < 6; i++) {
1860                 if (i < 4) {
1861                     dmv_x = dmv_y = pred_flag = 0;
1862                     val   = ((v->fourmvbp >> (3 - i)) & 1);
1863                     if (val) {
1864                         get_mvdata_interlaced(v, &dmv_x, &dmv_y, &pred_flag);
1865                     }
1866                     ff_vc1_pred_mv(v, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0], pred_flag, 0);
1867                     ff_vc1_mc_4mv_luma(v, i, 0, 0);
1868                 } else if (i == 4)
1869                     ff_vc1_mc_4mv_chroma(v, 0);
1870             }
1871             mb_has_coeffs = idx_mbmode & 1;
1872         }
1873         if (mb_has_coeffs)
1874             cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);
1875         if (cbp) {
1876             GET_MQUANT();
1877         }
1878         s->current_picture.qscale_table[mb_pos] = mquant;
1879         if (!v->ttmbf && cbp) {
1880             ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);
1881         }
1882         dst_idx = 0;
1883         for (i = 0; i < 6; i++) {
1884             s->dc_val[0][s->block_index[i]] = 0;
1885             dst_idx += i >> 2;
1886             val = ((cbp >> (5 - i)) & 1);
1887             off = (i & 4) ? 0 : (i & 1) * 8 + (i & 2) * 4 * s->linesize;
1888             if (val) {
1889                 pat = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,
1890                                          first_block, s->dest[dst_idx] + off,
1891                                          (i & 4) ? s->uvlinesize : s->linesize,
1892                                          (i & 4) && (s->flags & CODEC_FLAG_GRAY),
1893                                          &block_tt);
1894                 block_cbp |= pat << (i << 2);
1895                 if (!v->ttmbf && ttmb < 8) ttmb = -1;
1896                 first_block = 0;
1897             }
1898         }
1899     }
1900     if (s->mb_x == s->mb_width - 1)
1901         memmove(v->is_intra_base, v->is_intra, sizeof(v->is_intra_base[0]) * s->mb_stride);
1902     return 0;
1903 }
1904
1905 /** Decode one B-frame MB (in Main profile)
1906  */
1907 static void vc1_decode_b_mb(VC1Context *v)
1908 {
1909     MpegEncContext *s = &v->s;
1910     GetBitContext *gb = &s->gb;
1911     int i, j;
1912     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
1913     int cbp = 0; /* cbp decoding stuff */
1914     int mqdiff, mquant; /* MB quantization */
1915     int ttmb = v->ttfrm; /* MB Transform type */
1916     int mb_has_coeffs = 0; /* last_flag */
1917     int index, index1; /* LUT indexes */
1918     int val, sign; /* temp values */
1919     int first_block = 1;
1920     int dst_idx, off;
1921     int skipped, direct;
1922     int dmv_x[2], dmv_y[2];
1923     int bmvtype = BMV_TYPE_BACKWARD;
1924
1925     mquant      = v->pq; /* lossy initialization */
1926     s->mb_intra = 0;
1927
1928     if (v->dmb_is_raw)
1929         direct = get_bits1(gb);
1930     else
1931         direct = v->direct_mb_plane[mb_pos];
1932     if (v->skip_is_raw)
1933         skipped = get_bits1(gb);
1934     else
1935         skipped = v->s.mbskip_table[mb_pos];
1936
1937     dmv_x[0] = dmv_x[1] = dmv_y[0] = dmv_y[1] = 0;
1938     for (i = 0; i < 6; i++) {
1939         v->mb_type[0][s->block_index[i]] = 0;
1940         s->dc_val[0][s->block_index[i]]  = 0;
1941     }
1942     s->current_picture.qscale_table[mb_pos] = 0;
1943
1944     if (!direct) {
1945         if (!skipped) {
1946             GET_MVDATA(dmv_x[0], dmv_y[0]);
1947             dmv_x[1] = dmv_x[0];
1948             dmv_y[1] = dmv_y[0];
1949         }
1950         if (skipped || !s->mb_intra) {
1951             bmvtype = decode012(gb);
1952             switch (bmvtype) {
1953             case 0:
1954                 bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_BACKWARD : BMV_TYPE_FORWARD;
1955                 break;
1956             case 1:
1957                 bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_FORWARD : BMV_TYPE_BACKWARD;
1958                 break;
1959             case 2:
1960                 bmvtype  = BMV_TYPE_INTERPOLATED;
1961                 dmv_x[0] = dmv_y[0] = 0;
1962             }
1963         }
1964     }
1965     for (i = 0; i < 6; i++)
1966         v->mb_type[0][s->block_index[i]] = s->mb_intra;
1967
1968     if (skipped) {
1969         if (direct)
1970             bmvtype = BMV_TYPE_INTERPOLATED;
1971         ff_vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);
1972         vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);
1973         return;
1974     }
1975     if (direct) {
1976         cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);
1977         GET_MQUANT();
1978         s->mb_intra = 0;
1979         s->current_picture.qscale_table[mb_pos] = mquant;
1980         if (!v->ttmbf)
1981             ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);
1982         dmv_x[0] = dmv_y[0] = dmv_x[1] = dmv_y[1] = 0;
1983         ff_vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);
1984         vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);
1985     } else {
1986         if (!mb_has_coeffs && !s->mb_intra) {
1987             /* no coded blocks - effectively skipped */
1988             ff_vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);
1989             vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);
1990             return;
1991         }
1992         if (s->mb_intra && !mb_has_coeffs) {
1993             GET_MQUANT();
1994             s->current_picture.qscale_table[mb_pos] = mquant;
1995             s->ac_pred = get_bits1(gb);
1996             cbp = 0;
1997             ff_vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);
1998         } else {
1999             if (bmvtype == BMV_TYPE_INTERPOLATED) {
2000                 GET_MVDATA(dmv_x[0], dmv_y[0]);
2001                 if (!mb_has_coeffs) {
2002                     /* interpolated skipped block */
2003                     ff_vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);
2004                     vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);
2005                     return;
2006                 }
2007             }
2008             ff_vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);
2009             if (!s->mb_intra) {
2010                 vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);
2011             }
2012             if (s->mb_intra)
2013                 s->ac_pred = get_bits1(gb);
2014             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);
2015             GET_MQUANT();
2016             s->current_picture.qscale_table[mb_pos] = mquant;
2017             if (!v->ttmbf && !s->mb_intra && mb_has_coeffs)
2018                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);
2019         }
2020     }
2021     dst_idx = 0;
2022     for (i = 0; i < 6; i++) {
2023         s->dc_val[0][s->block_index[i]] = 0;
2024         dst_idx += i >> 2;
2025         val = ((cbp >> (5 - i)) & 1);
2026         off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);
2027         v->mb_type[0][s->block_index[i]] = s->mb_intra;
2028         if (s->mb_intra) {
2029             /* check if prediction blocks A and C are available */
2030             v->a_avail = v->c_avail = 0;
2031             if (i == 2 || i == 3 || !s->first_slice_line)
2032                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];
2033             if (i == 1 || i == 3 || s->mb_x)
2034                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];
2035
2036             vc1_decode_intra_block(v, s->block[i], i, val, mquant,
2037                                    (i & 4) ? v->codingset2 : v->codingset);
2038             if ((i>3) && (s->flags & CODEC_FLAG_GRAY))
2039                 continue;
2040             v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);
2041             if (v->rangeredfrm)
2042                 for (j = 0; j < 64; j++)
2043                     s->block[i][j] <<= 1;
2044             s->idsp.put_signed_pixels_clamped(s->block[i],
2045                                               s->dest[dst_idx] + off,
2046                                               i & 4 ? s->uvlinesize
2047                                                     : s->linesize);
2048         } else if (val) {
2049             vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,
2050                                first_block, s->dest[dst_idx] + off,
2051                                (i & 4) ? s->uvlinesize : s->linesize,
2052                                (i & 4) && (s->flags & CODEC_FLAG_GRAY), NULL);
2053             if (!v->ttmbf && ttmb < 8)
2054                 ttmb = -1;
2055             first_block = 0;
2056         }
2057     }
2058 }
2059
2060 /** Decode one B-frame MB (in interlaced field B picture)
2061  */
2062 static void vc1_decode_b_mb_intfi(VC1Context *v)
2063 {
2064     MpegEncContext *s = &v->s;
2065     GetBitContext *gb = &s->gb;
2066     int i, j;
2067     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
2068     int cbp = 0; /* cbp decoding stuff */
2069     int mqdiff, mquant; /* MB quantization */
2070     int ttmb = v->ttfrm; /* MB Transform type */
2071     int mb_has_coeffs = 0; /* last_flag */
2072     int val; /* temp value */
2073     int first_block = 1;
2074     int dst_idx, off;
2075     int fwd;
2076     int dmv_x[2], dmv_y[2], pred_flag[2];
2077     int bmvtype = BMV_TYPE_BACKWARD;
2078     int idx_mbmode;
2079
2080     mquant      = v->pq; /* Lossy initialization */
2081     s->mb_intra = 0;
2082
2083     idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_IF_MBMODE_VLC_BITS, 2);
2084     if (idx_mbmode <= 1) { // intra MB
2085         v->is_intra[s->mb_x] = 0x3f; // Set the bitfield to all 1.
2086         s->mb_intra          = 1;
2087         s->current_picture.motion_val[1][s->block_index[0]][0] = 0;
2088         s->current_picture.motion_val[1][s->block_index[0]][1] = 0;
2089         s->current_picture.mb_type[mb_pos + v->mb_off]         = MB_TYPE_INTRA;
2090         GET_MQUANT();
2091         s->current_picture.qscale_table[mb_pos] = mquant;
2092         /* Set DC scale - y and c use the same (not sure if necessary here) */
2093         s->y_dc_scale = s->y_dc_scale_table[mquant];
2094         s->c_dc_scale = s->c_dc_scale_table[mquant];
2095         v->s.ac_pred  = v->acpred_plane[mb_pos] = get_bits1(gb);
2096         mb_has_coeffs = idx_mbmode & 1;
2097         if (mb_has_coeffs)
2098             cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_ICBPCY_VLC_BITS, 2);
2099         dst_idx = 0;
2100         for (i = 0; i < 6; i++) {
2101             v->a_avail = v->c_avail          = 0;
2102             v->mb_type[0][s->block_index[i]] = 1;
2103             s->dc_val[0][s->block_index[i]]  = 0;
2104             dst_idx += i >> 2;
2105             val = ((cbp >> (5 - i)) & 1);
2106             if (i == 2 || i == 3 || !s->first_slice_line)
2107                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];
2108             if (i == 1 || i == 3 || s->mb_x)
2109                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];
2110
2111             vc1_decode_intra_block(v, s->block[i], i, val, mquant,
2112                                    (i & 4) ? v->codingset2 : v->codingset);
2113             if ((i>3) && (s->flags & CODEC_FLAG_GRAY))
2114                 continue;
2115             v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);
2116             if (v->rangeredfrm)
2117                 for (j = 0; j < 64; j++)
2118                     s->block[i][j] <<= 1;
2119             off  = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);
2120             s->idsp.put_signed_pixels_clamped(s->block[i],
2121                                               s->dest[dst_idx] + off,
2122                                               (i & 4) ? s->uvlinesize
2123                                                       : s->linesize);
2124             // TODO: yet to perform loop filter
2125         }
2126     } else {
2127         s->mb_intra = v->is_intra[s->mb_x] = 0;
2128         s->current_picture.mb_type[mb_pos + v->mb_off] = MB_TYPE_16x16;
2129         for (i = 0; i < 6; i++) v->mb_type[0][s->block_index[i]] = 0;
2130         if (v->fmb_is_raw)
2131             fwd = v->forward_mb_plane[mb_pos] = get_bits1(gb);
2132         else
2133             fwd = v->forward_mb_plane[mb_pos];
2134         if (idx_mbmode <= 5) { // 1-MV
2135             int interpmvp = 0;
2136             dmv_x[0]     = dmv_x[1] = dmv_y[0] = dmv_y[1] = 0;
2137             pred_flag[0] = pred_flag[1] = 0;
2138             if (fwd)
2139                 bmvtype = BMV_TYPE_FORWARD;
2140             else {
2141                 bmvtype = decode012(gb);
2142                 switch (bmvtype) {
2143                 case 0:
2144                     bmvtype = BMV_TYPE_BACKWARD;
2145                     break;
2146                 case 1:
2147                     bmvtype = BMV_TYPE_DIRECT;
2148                     break;
2149                 case 2:
2150                     bmvtype   = BMV_TYPE_INTERPOLATED;
2151                     interpmvp = get_bits1(gb);
2152                 }
2153             }
2154             v->bmvtype = bmvtype;
2155             if (bmvtype != BMV_TYPE_DIRECT && idx_mbmode & 1) {
2156                 get_mvdata_interlaced(v, &dmv_x[bmvtype == BMV_TYPE_BACKWARD], &dmv_y[bmvtype == BMV_TYPE_BACKWARD], &pred_flag[bmvtype == BMV_TYPE_BACKWARD]);
2157             }
2158             if (interpmvp) {
2159                 get_mvdata_interlaced(v, &dmv_x[1], &dmv_y[1], &pred_flag[1]);
2160             }
2161             if (bmvtype == BMV_TYPE_DIRECT) {
2162                 dmv_x[0] = dmv_y[0] = pred_flag[0] = 0;
2163                 dmv_x[1] = dmv_y[1] = pred_flag[0] = 0;
2164                 if (!s->next_picture_ptr->field_picture) {
2165                     av_log(s->avctx, AV_LOG_ERROR, "Mixed field/frame direct mode not supported\n");
2166                     return;
2167                 }
2168             }
2169             ff_vc1_pred_b_mv_intfi(v, 0, dmv_x, dmv_y, 1, pred_flag);
2170             vc1_b_mc(v, dmv_x, dmv_y, (bmvtype == BMV_TYPE_DIRECT), bmvtype);
2171             mb_has_coeffs = !(idx_mbmode & 2);
2172         } else { // 4-MV
2173             if (fwd)
2174                 bmvtype = BMV_TYPE_FORWARD;
2175             v->bmvtype  = bmvtype;
2176             v->fourmvbp = get_vlc2(gb, v->fourmvbp_vlc->table, VC1_4MV_BLOCK_PATTERN_VLC_BITS, 1);
2177             for (i = 0; i < 6; i++) {
2178                 if (i < 4) {
2179                     dmv_x[0] = dmv_y[0] = pred_flag[0] = 0;
2180                     dmv_x[1] = dmv_y[1] = pred_flag[1] = 0;
2181                     val = ((v->fourmvbp >> (3 - i)) & 1);
2182                     if (val) {
2183                         get_mvdata_interlaced(v, &dmv_x[bmvtype == BMV_TYPE_BACKWARD],
2184                                                  &dmv_y[bmvtype == BMV_TYPE_BACKWARD],
2185                                              &pred_flag[bmvtype == BMV_TYPE_BACKWARD]);
2186                     }
2187                     ff_vc1_pred_b_mv_intfi(v, i, dmv_x, dmv_y, 0, pred_flag);
2188                     ff_vc1_mc_4mv_luma(v, i, bmvtype == BMV_TYPE_BACKWARD, 0);
2189                 } else if (i == 4)
2190                     ff_vc1_mc_4mv_chroma(v, bmvtype == BMV_TYPE_BACKWARD);
2191             }
2192             mb_has_coeffs = idx_mbmode & 1;
2193         }
2194         if (mb_has_coeffs)
2195             cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);
2196         if (cbp) {
2197             GET_MQUANT();
2198         }
2199         s->current_picture.qscale_table[mb_pos] = mquant;
2200         if (!v->ttmbf && cbp) {
2201             ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);
2202         }
2203         dst_idx = 0;
2204         for (i = 0; i < 6; i++) {
2205             s->dc_val[0][s->block_index[i]] = 0;
2206             dst_idx += i >> 2;
2207             val = ((cbp >> (5 - i)) & 1);
2208             off = (i & 4) ? 0 : (i & 1) * 8 + (i & 2) * 4 * s->linesize;
2209             if (val) {
2210                 vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,
2211                                    first_block, s->dest[dst_idx] + off,
2212                                    (i & 4) ? s->uvlinesize : s->linesize,
2213                                    (i & 4) && (s->flags & CODEC_FLAG_GRAY), NULL);
2214                 if (!v->ttmbf && ttmb < 8)
2215                     ttmb = -1;
2216                 first_block = 0;
2217             }
2218         }
2219     }
2220 }
2221
2222 /** Decode one B-frame MB (in interlaced frame B picture)
2223  */
2224 static int vc1_decode_b_mb_intfr(VC1Context *v)
2225 {
2226     MpegEncContext *s = &v->s;
2227     GetBitContext *gb = &s->gb;
2228     int i, j;
2229     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
2230     int cbp = 0; /* cbp decoding stuff */
2231     int mqdiff, mquant; /* MB quantization */
2232     int ttmb = v->ttfrm; /* MB Transform type */
2233     int mvsw = 0; /* motion vector switch */
2234     int mb_has_coeffs = 1; /* last_flag */
2235     int dmv_x, dmv_y; /* Differential MV components */
2236     int val; /* temp value */
2237     int first_block = 1;
2238     int dst_idx, off;
2239     int skipped, direct, twomv = 0;
2240     int block_cbp = 0, pat, block_tt = 0;
2241     int idx_mbmode = 0, mvbp;
2242     int stride_y, fieldtx;
2243     int bmvtype = BMV_TYPE_BACKWARD;
2244     int dir, dir2;
2245
2246     mquant = v->pq; /* Lossy initialization */
2247     s->mb_intra = 0;
2248     if (v->skip_is_raw)
2249         skipped = get_bits1(gb);
2250     else
2251         skipped = v->s.mbskip_table[mb_pos];
2252
2253     if (!skipped) {
2254         idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_INTFR_NON4MV_MBMODE_VLC_BITS, 2);
2255         if (ff_vc1_mbmode_intfrp[0][idx_mbmode][0] == MV_PMODE_INTFR_2MV_FIELD) {
2256             twomv = 1;
2257             v->blk_mv_type[s->block_index[0]] = 1;
2258             v->blk_mv_type[s->block_index[1]] = 1;
2259             v->blk_mv_type[s->block_index[2]] = 1;
2260             v->blk_mv_type[s->block_index[3]] = 1;
2261         } else {
2262             v->blk_mv_type[s->block_index[0]] = 0;
2263             v->blk_mv_type[s->block_index[1]] = 0;
2264             v->blk_mv_type[s->block_index[2]] = 0;
2265             v->blk_mv_type[s->block_index[3]] = 0;
2266         }
2267     }
2268
2269     if (v->dmb_is_raw)
2270         direct = get_bits1(gb);
2271     else
2272         direct = v->direct_mb_plane[mb_pos];
2273
2274     if (direct) {
2275         if (s->next_picture_ptr->field_picture)
2276             av_log(s->avctx, AV_LOG_WARNING, "Mixed frame/field direct mode not supported\n");
2277         s->mv[0][0][0] = s->current_picture.motion_val[0][s->block_index[0]][0] = scale_mv(s->next_picture.motion_val[1][s->block_index[0]][0], v->bfraction, 0, s->quarter_sample);
2278         s->mv[0][0][1] = s->current_picture.motion_val[0][s->block_index[0]][1] = scale_mv(s->next_picture.motion_val[1][s->block_index[0]][1], v->bfraction, 0, s->quarter_sample);
2279         s->mv[1][0][0] = s->current_picture.motion_val[1][s->block_index[0]][0] = scale_mv(s->next_picture.motion_val[1][s->block_index[0]][0], v->bfraction, 1, s->quarter_sample);
2280         s->mv[1][0][1] = s->current_picture.motion_val[1][s->block_index[0]][1] = scale_mv(s->next_picture.motion_val[1][s->block_index[0]][1], v->bfraction, 1, s->quarter_sample);
2281
2282         if (twomv) {
2283             s->mv[0][2][0] = s->current_picture.motion_val[0][s->block_index[2]][0] = scale_mv(s->next_picture.motion_val[1][s->block_index[2]][0], v->bfraction, 0, s->quarter_sample);
2284             s->mv[0][2][1] = s->current_picture.motion_val[0][s->block_index[2]][1] = scale_mv(s->next_picture.motion_val[1][s->block_index[2]][1], v->bfraction, 0, s->quarter_sample);
2285             s->mv[1][2][0] = s->current_picture.motion_val[1][s->block_index[2]][0] = scale_mv(s->next_picture.motion_val[1][s->block_index[2]][0], v->bfraction, 1, s->quarter_sample);
2286             s->mv[1][2][1] = s->current_picture.motion_val[1][s->block_index[2]][1] = scale_mv(s->next_picture.motion_val[1][s->block_index[2]][1], v->bfraction, 1, s->quarter_sample);
2287
2288             for (i = 1; i < 4; i += 2) {
2289                 s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0] = s->mv[0][i-1][0];
2290                 s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1] = s->mv[0][i-1][1];
2291                 s->mv[1][i][0] = s->current_picture.motion_val[1][s->block_index[i]][0] = s->mv[1][i-1][0];
2292                 s->mv[1][i][1] = s->current_picture.motion_val[1][s->block_index[i]][1] = s->mv[1][i-1][1];
2293             }
2294         } else {
2295             for (i = 1; i < 4; i++) {
2296                 s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0] = s->mv[0][0][0];
2297                 s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1] = s->mv[0][0][1];
2298                 s->mv[1][i][0] = s->current_picture.motion_val[1][s->block_index[i]][0] = s->mv[1][0][0];
2299                 s->mv[1][i][1] = s->current_picture.motion_val[1][s->block_index[i]][1] = s->mv[1][0][1];
2300             }
2301         }
2302     }
2303
2304     if (ff_vc1_mbmode_intfrp[0][idx_mbmode][0] == MV_PMODE_INTFR_INTRA) { // intra MB
2305         for (i = 0; i < 4; i++) {
2306             s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0] = 0;
2307             s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1] = 0;
2308             s->mv[1][i][0] = s->current_picture.motion_val[1][s->block_index[i]][0] = 0;
2309             s->mv[1][i][1] = s->current_picture.motion_val[1][s->block_index[i]][1] = 0;
2310         }
2311         v->is_intra[s->mb_x] = 0x3f; // Set the bitfield to all 1.
2312         s->mb_intra          = 1;
2313         s->current_picture.mb_type[mb_pos] = MB_TYPE_INTRA;
2314         fieldtx = v->fieldtx_plane[mb_pos] = get_bits1(gb);
2315         mb_has_coeffs = get_bits1(gb);
2316         if (mb_has_coeffs)
2317             cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);
2318         v->s.ac_pred = v->acpred_plane[mb_pos] = get_bits1(gb);
2319         GET_MQUANT();
2320         s->current_picture.qscale_table[mb_pos] = mquant;
2321         /* Set DC scale - y and c use the same (not sure if necessary here) */
2322         s->y_dc_scale = s->y_dc_scale_table[mquant];
2323         s->c_dc_scale = s->c_dc_scale_table[mquant];
2324         dst_idx = 0;
2325         for (i = 0; i < 6; i++) {
2326             v->a_avail = v->c_avail          = 0;
2327             v->mb_type[0][s->block_index[i]] = 1;
2328             s->dc_val[0][s->block_index[i]]  = 0;
2329             dst_idx += i >> 2;
2330             val = ((cbp >> (5 - i)) & 1);
2331             if (i == 2 || i == 3 || !s->first_slice_line)
2332                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];
2333             if (i == 1 || i == 3 || s->mb_x)
2334                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];
2335
2336             vc1_decode_intra_block(v, s->block[i], i, val, mquant,
2337                                    (i & 4) ? v->codingset2 : v->codingset);
2338             if (i > 3 && (s->flags & CODEC_FLAG_GRAY))
2339                 continue;
2340             v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);
2341             if (i < 4) {
2342                 stride_y = s->linesize << fieldtx;
2343                 off = (fieldtx) ? ((i & 1) * 8) + ((i & 2) >> 1) * s->linesize : (i & 1) * 8 + 4 * (i & 2) * s->linesize;
2344             } else {
2345                 stride_y = s->uvlinesize;
2346                 off = 0;
2347             }
2348             s->idsp.put_signed_pixels_clamped(s->block[i],
2349                                               s->dest[dst_idx] + off,
2350                                               stride_y);
2351         }
2352     } else {
2353         s->mb_intra = v->is_intra[s->mb_x] = 0;
2354         if (!direct) {
2355             if (skipped || !s->mb_intra) {
2356                 bmvtype = decode012(gb);
2357                 switch (bmvtype) {
2358                 case 0:
2359                     bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_BACKWARD : BMV_TYPE_FORWARD;
2360                     break;
2361                 case 1:
2362                     bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_FORWARD : BMV_TYPE_BACKWARD;
2363                     break;
2364                 case 2:
2365                     bmvtype  = BMV_TYPE_INTERPOLATED;
2366                 }
2367             }
2368
2369             if (twomv && bmvtype != BMV_TYPE_INTERPOLATED)
2370                 mvsw = get_bits1(gb);
2371         }
2372
2373         if (!skipped) { // inter MB
2374             mb_has_coeffs = ff_vc1_mbmode_intfrp[0][idx_mbmode][3];
2375             if (mb_has_coeffs)
2376                 cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);
2377             if (!direct) {
2378                 if (bmvtype == BMV_TYPE_INTERPOLATED && twomv) {
2379                     v->fourmvbp = get_vlc2(gb, v->fourmvbp_vlc->table, VC1_4MV_BLOCK_PATTERN_VLC_BITS, 1);
2380                 } else if (bmvtype == BMV_TYPE_INTERPOLATED || twomv) {
2381                     v->twomvbp = get_vlc2(gb, v->twomvbp_vlc->table, VC1_2MV_BLOCK_PATTERN_VLC_BITS, 1);
2382                 }
2383             }
2384
2385             for (i = 0; i < 6; i++)
2386                 v->mb_type[0][s->block_index[i]] = 0;
2387             fieldtx = v->fieldtx_plane[mb_pos] = ff_vc1_mbmode_intfrp[0][idx_mbmode][1];
2388             /* for all motion vector read MVDATA and motion compensate each block */
2389             dst_idx = 0;
2390             if (direct) {
2391                 if (twomv) {
2392                     for (i = 0; i < 4; i++) {
2393                         ff_vc1_mc_4mv_luma(v, i, 0, 0);
2394                         ff_vc1_mc_4mv_luma(v, i, 1, 1);
2395                     }
2396                     ff_vc1_mc_4mv_chroma4(v, 0, 0, 0);
2397                     ff_vc1_mc_4mv_chroma4(v, 1, 1, 1);
2398                 } else {
2399                     ff_vc1_mc_1mv(v, 0);
2400                     ff_vc1_interp_mc(v);
2401                 }
2402             } else if (twomv && bmvtype == BMV_TYPE_INTERPOLATED) {
2403                 mvbp = v->fourmvbp;
2404                 for (i = 0; i < 4; i++) {
2405                     dir = i==1 || i==3;
2406                     dmv_x = dmv_y = 0;
2407                     val = ((mvbp >> (3 - i)) & 1);
2408                     if (val)
2409                         get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);
2410                     j = i > 1 ? 2 : 0;
2411                     ff_vc1_pred_mv_intfr(v, j, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0], dir);
2412                     ff_vc1_mc_4mv_luma(v, j, dir, dir);
2413                     ff_vc1_mc_4mv_luma(v, j+1, dir, dir);
2414                 }
2415
2416                 ff_vc1_mc_4mv_chroma4(v, 0, 0, 0);
2417                 ff_vc1_mc_4mv_chroma4(v, 1, 1, 1);
2418             } else if (bmvtype == BMV_TYPE_INTERPOLATED) {
2419                 mvbp = v->twomvbp;
2420                 dmv_x = dmv_y = 0;
2421                 if (mvbp & 2)
2422                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);
2423
2424                 ff_vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], 0);
2425                 ff_vc1_mc_1mv(v, 0);
2426
2427                 dmv_x = dmv_y = 0;
2428                 if (mvbp & 1)
2429                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);
2430
2431                 ff_vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], 1);
2432                 ff_vc1_interp_mc(v);
2433             } else if (twomv) {
2434                 dir = bmvtype == BMV_TYPE_BACKWARD;
2435                 dir2 = dir;
2436                 if (mvsw)
2437                     dir2 = !dir;
2438                 mvbp = v->twomvbp;
2439                 dmv_x = dmv_y = 0;
2440                 if (mvbp & 2)
2441                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);
2442                 ff_vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0], dir);
2443
2444                 dmv_x = dmv_y = 0;
2445                 if (mvbp & 1)
2446                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);
2447                 ff_vc1_pred_mv_intfr(v, 2, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0], dir2);
2448
2449                 if (mvsw) {
2450                     for (i = 0; i < 2; i++) {
2451                         s->mv[dir][i+2][0] = s->mv[dir][i][0] = s->current_picture.motion_val[dir][s->block_index[i+2]][0] = s->current_picture.motion_val[dir][s->block_index[i]][0];
2452                         s->mv[dir][i+2][1] = s->mv[dir][i][1] = s->current_picture.motion_val[dir][s->block_index[i+2]][1] = s->current_picture.motion_val[dir][s->block_index[i]][1];
2453                         s->mv[dir2][i+2][0] = s->mv[dir2][i][0] = s->current_picture.motion_val[dir2][s->block_index[i]][0] = s->current_picture.motion_val[dir2][s->block_index[i+2]][0];
2454                         s->mv[dir2][i+2][1] = s->mv[dir2][i][1] = s->current_picture.motion_val[dir2][s->block_index[i]][1] = s->current_picture.motion_val[dir2][s->block_index[i+2]][1];
2455                     }
2456                 } else {
2457                     ff_vc1_pred_mv_intfr(v, 0, 0, 0, 2, v->range_x, v->range_y, v->mb_type[0], !dir);
2458                     ff_vc1_pred_mv_intfr(v, 2, 0, 0, 2, v->range_x, v->range_y, v->mb_type[0], !dir);
2459                 }
2460
2461                 ff_vc1_mc_4mv_luma(v, 0, dir, 0);
2462                 ff_vc1_mc_4mv_luma(v, 1, dir, 0);
2463                 ff_vc1_mc_4mv_luma(v, 2, dir2, 0);
2464                 ff_vc1_mc_4mv_luma(v, 3, dir2, 0);
2465                 ff_vc1_mc_4mv_chroma4(v, dir, dir2, 0);
2466             } else {
2467                 dir = bmvtype == BMV_TYPE_BACKWARD;
2468
2469                 mvbp = ff_vc1_mbmode_intfrp[0][idx_mbmode][2];
2470                 dmv_x = dmv_y = 0;
2471                 if (mvbp)
2472                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);
2473
2474                 ff_vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], dir);
2475                 v->blk_mv_type[s->block_index[0]] = 1;
2476                 v->blk_mv_type[s->block_index[1]] = 1;
2477                 v->blk_mv_type[s->block_index[2]] = 1;
2478                 v->blk_mv_type[s->block_index[3]] = 1;
2479                 ff_vc1_pred_mv_intfr(v, 0, 0, 0, 2, v->range_x, v->range_y, 0, !dir);
2480                 for (i = 0; i < 2; i++) {
2481                     s->mv[!dir][i+2][0] = s->mv[!dir][i][0] = s->current_picture.motion_val[!dir][s->block_index[i+2]][0] = s->current_picture.motion_val[!dir][s->block_index[i]][0];
2482                     s->mv[!dir][i+2][1] = s->mv[!dir][i][1] = s->current_picture.motion_val[!dir][s->block_index[i+2]][1] = s->current_picture.motion_val[!dir][s->block_index[i]][1];
2483                 }
2484                 ff_vc1_mc_1mv(v, dir);
2485             }
2486
2487             if (cbp)
2488                 GET_MQUANT();  // p. 227
2489             s->current_picture.qscale_table[mb_pos] = mquant;
2490             if (!v->ttmbf && cbp)
2491                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);
2492             for (i = 0; i < 6; i++) {
2493                 s->dc_val[0][s->block_index[i]] = 0;
2494                 dst_idx += i >> 2;
2495                 val = ((cbp >> (5 - i)) & 1);
2496                 if (!fieldtx)
2497                     off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);
2498                 else
2499                     off = (i & 4) ? 0 : ((i & 1) * 8 + ((i > 1) * s->linesize));
2500                 if (val) {
2501                     pat = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,
2502                                              first_block, s->dest[dst_idx] + off,
2503                                              (i & 4) ? s->uvlinesize : (s->linesize << fieldtx),
2504                                              (i & 4) && (s->flags & CODEC_FLAG_GRAY), &block_tt);
2505                     block_cbp |= pat << (i << 2);
2506                     if (!v->ttmbf && ttmb < 8)
2507                         ttmb = -1;
2508                     first_block = 0;
2509                 }
2510             }
2511
2512         } else { // skipped
2513             dir = 0;
2514             for (i = 0; i < 6; i++) {
2515                 v->mb_type[0][s->block_index[i]] = 0;
2516                 s->dc_val[0][s->block_index[i]] = 0;
2517             }
2518             s->current_picture.mb_type[mb_pos]      = MB_TYPE_SKIP;
2519             s->current_picture.qscale_table[mb_pos] = 0;
2520             v->blk_mv_type[s->block_index[0]] = 0;
2521             v->blk_mv_type[s->block_index[1]] = 0;
2522             v->blk_mv_type[s->block_index[2]] = 0;
2523             v->blk_mv_type[s->block_index[3]] = 0;
2524
2525             if (!direct) {
2526                 if (bmvtype == BMV_TYPE_INTERPOLATED) {
2527                     ff_vc1_pred_mv_intfr(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0], 0);
2528                     ff_vc1_pred_mv_intfr(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0], 1);
2529                 } else {
2530                     dir = bmvtype == BMV_TYPE_BACKWARD;
2531                     ff_vc1_pred_mv_intfr(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0], dir);
2532                     if (mvsw) {
2533                         int dir2 = dir;
2534                         if (mvsw)
2535                             dir2 = !dir;
2536                         for (i = 0; i < 2; i++) {
2537                             s->mv[dir][i+2][0] = s->mv[dir][i][0] = s->current_picture.motion_val[dir][s->block_index[i+2]][0] = s->current_picture.motion_val[dir][s->block_index[i]][0];
2538                             s->mv[dir][i+2][1] = s->mv[dir][i][1] = s->current_picture.motion_val[dir][s->block_index[i+2]][1] = s->current_picture.motion_val[dir][s->block_index[i]][1];
2539                             s->mv[dir2][i+2][0] = s->mv[dir2][i][0] = s->current_picture.motion_val[dir2][s->block_index[i]][0] = s->current_picture.motion_val[dir2][s->block_index[i+2]][0];
2540                             s->mv[dir2][i+2][1] = s->mv[dir2][i][1] = s->current_picture.motion_val[dir2][s->block_index[i]][1] = s->current_picture.motion_val[dir2][s->block_index[i+2]][1];
2541                         }
2542                     } else {
2543                         v->blk_mv_type[s->block_index[0]] = 1;
2544                         v->blk_mv_type[s->block_index[1]] = 1;
2545                         v->blk_mv_type[s->block_index[2]] = 1;
2546                         v->blk_mv_type[s->block_index[3]] = 1;
2547                         ff_vc1_pred_mv_intfr(v, 0, 0, 0, 2, v->range_x, v->range_y, 0, !dir);
2548                         for (i = 0; i < 2; i++) {
2549                             s->mv[!dir][i+2][0] = s->mv[!dir][i][0] = s->current_picture.motion_val[!dir][s->block_index[i+2]][0] = s->current_picture.motion_val[!dir][s->block_index[i]][0];
2550                             s->mv[!dir][i+2][1] = s->mv[!dir][i][1] = s->current_picture.motion_val[!dir][s->block_index[i+2]][1] = s->current_picture.motion_val[!dir][s->block_index[i]][1];
2551                         }
2552                     }
2553                 }
2554             }
2555
2556             ff_vc1_mc_1mv(v, dir);
2557             if (direct || bmvtype == BMV_TYPE_INTERPOLATED) {
2558                 ff_vc1_interp_mc(v);
2559             }
2560         }
2561     }
2562     if (s->mb_x == s->mb_width - 1)
2563         memmove(v->is_intra_base, v->is_intra, sizeof(v->is_intra_base[0]) * s->mb_stride);
2564     v->cbp[s->mb_x]      = block_cbp;
2565     v->ttblk[s->mb_x]    = block_tt;
2566     return 0;
2567 }
2568
2569 /** Decode blocks of I-frame
2570  */
2571 static void vc1_decode_i_blocks(VC1Context *v)
2572 {
2573     int k, j;
2574     MpegEncContext *s = &v->s;
2575     int cbp, val;
2576     uint8_t *coded_val;
2577     int mb_pos;
2578
2579     /* select codingmode used for VLC tables selection */
2580     switch (v->y_ac_table_index) {
2581     case 0:
2582         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;
2583         break;
2584     case 1:
2585         v->codingset = CS_HIGH_MOT_INTRA;
2586         break;
2587     case 2:
2588         v->codingset = CS_MID_RATE_INTRA;
2589         break;
2590     }
2591
2592     switch (v->c_ac_table_index) {
2593     case 0:
2594         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;
2595         break;
2596     case 1:
2597         v->codingset2 = CS_HIGH_MOT_INTER;
2598         break;
2599     case 2:
2600         v->codingset2 = CS_MID_RATE_INTER;
2601         break;
2602     }
2603
2604     /* Set DC scale - y and c use the same */
2605     s->y_dc_scale = s->y_dc_scale_table[v->pq];
2606     s->c_dc_scale = s->c_dc_scale_table[v->pq];
2607
2608     //do frame decode
2609     s->mb_x = s->mb_y = 0;
2610     s->mb_intra         = 1;
2611     s->first_slice_line = 1;
2612     for (s->mb_y = 0; s->mb_y < s->end_mb_y; s->mb_y++) {
2613         s->mb_x = 0;
2614         init_block_index(v);
2615         for (; s->mb_x < v->end_mb_x; s->mb_x++) {
2616             uint8_t *dst[6];
2617             ff_update_block_index(s);
2618             dst[0] = s->dest[0];
2619             dst[1] = dst[0] + 8;
2620             dst[2] = s->dest[0] + s->linesize * 8;
2621             dst[3] = dst[2] + 8;
2622             dst[4] = s->dest[1];
2623             dst[5] = s->dest[2];
2624             s->bdsp.clear_blocks(s->block[0]);
2625             mb_pos = s->mb_x + s->mb_y * s->mb_width;
2626             s->current_picture.mb_type[mb_pos]                     = MB_TYPE_INTRA;
2627             s->current_picture.qscale_table[mb_pos]                = v->pq;
2628             s->current_picture.motion_val[1][s->block_index[0]][0] = 0;
2629             s->current_picture.motion_val[1][s->block_index[0]][1] = 0;
2630
2631             // do actual MB decoding and displaying
2632             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);
2633             v->s.ac_pred = get_bits1(&v->s.gb);
2634
2635             for (k = 0; k < 6; k++) {
2636                 val = ((cbp >> (5 - k)) & 1);
2637
2638                 if (k < 4) {
2639                     int pred   = vc1_coded_block_pred(&v->s, k, &coded_val);
2640                     val        = val ^ pred;
2641                     *coded_val = val;
2642                 }
2643                 cbp |= val << (5 - k);
2644
2645                 vc1_decode_i_block(v, s->block[k], k, val, (k < 4) ? v->codingset : v->codingset2);
2646
2647                 if (k > 3 && (s->flags & CODEC_FLAG_GRAY))
2648                     continue;
2649                 v->vc1dsp.vc1_inv_trans_8x8(s->block[k]);
2650                 if (v->pq >= 9 && v->overlap) {
2651                     if (v->rangeredfrm)
2652                         for (j = 0; j < 64; j++)
2653                             s->block[k][j] <<= 1;
2654                     s->idsp.put_signed_pixels_clamped(s->block[k], dst[k],
2655                                                       k & 4 ? s->uvlinesize
2656                                                             : s->linesize);
2657                 } else {
2658                     if (v->rangeredfrm)
2659                         for (j = 0; j < 64; j++)
2660                             s->block[k][j] = (s->block[k][j] - 64) << 1;
2661                     s->idsp.put_pixels_clamped(s->block[k], dst[k],
2662                                                k & 4 ? s->uvlinesize
2663                                                      : s->linesize);
2664                 }
2665             }
2666
2667             if (v->pq >= 9 && v->overlap) {
2668                 if (s->mb_x) {
2669                     v->vc1dsp.vc1_h_overlap(s->dest[0], s->linesize);
2670                     v->vc1dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize, s->linesize);
2671                     if (!(s->flags & CODEC_FLAG_GRAY)) {
2672                         v->vc1dsp.vc1_h_overlap(s->dest[1], s->uvlinesize);
2673                         v->vc1dsp.vc1_h_overlap(s->dest[2], s->uvlinesize);
2674                     }
2675                 }
2676                 v->vc1dsp.vc1_h_overlap(s->dest[0] + 8, s->linesize);
2677                 v->vc1dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);
2678                 if (!s->first_slice_line) {
2679                     v->vc1dsp.vc1_v_overlap(s->dest[0], s->linesize);
2680                     v->vc1dsp.vc1_v_overlap(s->dest[0] + 8, s->linesize);
2681                     if (!(s->flags & CODEC_FLAG_GRAY)) {
2682                         v->vc1dsp.vc1_v_overlap(s->dest[1], s->uvlinesize);
2683                         v->vc1dsp.vc1_v_overlap(s->dest[2], s->uvlinesize);
2684                     }
2685                 }
2686                 v->vc1dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize, s->linesize);
2687                 v->vc1dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);
2688             }
2689             if (v->s.loop_filter)
2690                 ff_vc1_loop_filter_iblk(v, v->pq);
2691
2692             if (get_bits_count(&s->gb) > v->bits) {
2693                 ff_er_add_slice(&s->er, 0, 0, s->mb_x, s->mb_y, ER_MB_ERROR);
2694                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n",
2695                        get_bits_count(&s->gb), v->bits);
2696                 return;
2697             }
2698         }
2699         if (!v->s.loop_filter)
2700             ff_mpeg_draw_horiz_band(s, s->mb_y * 16, 16);
2701         else if (s->mb_y)
2702             ff_mpeg_draw_horiz_band(s, (s->mb_y - 1) * 16, 16);
2703
2704         s->first_slice_line = 0;
2705     }
2706     if (v->s.loop_filter)
2707         ff_mpeg_draw_horiz_band(s, (s->end_mb_y - 1) * 16, 16);
2708
2709     /* This is intentionally mb_height and not end_mb_y - unlike in advanced
2710      * profile, these only differ are when decoding MSS2 rectangles. */
2711     ff_er_add_slice(&s->er, 0, 0, s->mb_width - 1, s->mb_height - 1, ER_MB_END);
2712 }
2713
2714 /** Decode blocks of I-frame for advanced profile
2715  */
2716 static void vc1_decode_i_blocks_adv(VC1Context *v)
2717 {
2718     int k;
2719     MpegEncContext *s = &v->s;
2720     int cbp, val;
2721     uint8_t *coded_val;
2722     int mb_pos;
2723     int mquant = v->pq;
2724     int mqdiff;
2725     GetBitContext *gb = &s->gb;
2726
2727     /* select codingmode used for VLC tables selection */
2728     switch (v->y_ac_table_index) {
2729     case 0:
2730         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;
2731         break;
2732     case 1:
2733         v->codingset = CS_HIGH_MOT_INTRA;
2734         break;
2735     case 2:
2736         v->codingset = CS_MID_RATE_INTRA;
2737         break;
2738     }
2739
2740     switch (v->c_ac_table_index) {
2741     case 0:
2742         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;
2743         break;
2744     case 1:
2745         v->codingset2 = CS_HIGH_MOT_INTER;
2746         break;
2747     case 2:
2748         v->codingset2 = CS_MID_RATE_INTER;
2749         break;
2750     }
2751
2752     // do frame decode
2753     s->mb_x             = s->mb_y = 0;
2754     s->mb_intra         = 1;
2755     s->first_slice_line = 1;
2756     s->mb_y             = s->start_mb_y;
2757     if (s->start_mb_y) {
2758         s->mb_x = 0;
2759         init_block_index(v);
2760         memset(&s->coded_block[s->block_index[0] - s->b8_stride], 0,
2761                (1 + s->b8_stride) * sizeof(*s->coded_block));
2762     }
2763     for (; s->mb_y < s->end_mb_y; s->mb_y++) {
2764         s->mb_x = 0;
2765         init_block_index(v);
2766         for (;s->mb_x < s->mb_width; s->mb_x++) {
2767             int16_t (*block)[64] = v->block[v->cur_blk_idx];
2768             ff_update_block_index(s);
2769             s->bdsp.clear_blocks(block[0]);
2770             mb_pos = s->mb_x + s->mb_y * s->mb_stride;
2771             s->current_picture.mb_type[mb_pos + v->mb_off]                         = MB_TYPE_INTRA;
2772             s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][0] = 0;
2773             s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][1] = 0;
2774
2775             // do actual MB decoding and displaying
2776             if (v->fieldtx_is_raw)
2777                 v->fieldtx_plane[mb_pos] = get_bits1(&v->s.gb);
2778             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);
2779             if ( v->acpred_is_raw)
2780                 v->s.ac_pred = get_bits1(&v->s.gb);
2781             else
2782                 v->s.ac_pred = v->acpred_plane[mb_pos];
2783
2784             if (v->condover == CONDOVER_SELECT && v->overflg_is_raw)
2785                 v->over_flags_plane[mb_pos] = get_bits1(&v->s.gb);
2786
2787             GET_MQUANT();
2788
2789             s->current_picture.qscale_table[mb_pos] = mquant;
2790             /* Set DC scale - y and c use the same */
2791             s->y_dc_scale = s->y_dc_scale_table[mquant];
2792             s->c_dc_scale = s->c_dc_scale_table[mquant];
2793
2794             for (k = 0; k < 6; k++) {
2795                 val = ((cbp >> (5 - k)) & 1);
2796
2797                 if (k < 4) {
2798                     int pred   = vc1_coded_block_pred(&v->s, k, &coded_val);
2799                     val        = val ^ pred;
2800                     *coded_val = val;
2801                 }
2802                 cbp |= val << (5 - k);
2803
2804                 v->a_avail = !s->first_slice_line || (k == 2 || k == 3);
2805                 v->c_avail = !!s->mb_x || (k == 1 || k == 3);
2806
2807                 vc1_decode_i_block_adv(v, block[k], k, val,
2808                                        (k < 4) ? v->codingset : v->codingset2, mquant);
2809
2810                 if (k > 3 && (s->flags & CODEC_FLAG_GRAY))
2811                     continue;
2812                 v->vc1dsp.vc1_inv_trans_8x8(block[k]);
2813             }
2814
2815             ff_vc1_smooth_overlap_filter_iblk(v);
2816             vc1_put_signed_blocks_clamped(v);
2817             if (v->s.loop_filter)
2818                 ff_vc1_loop_filter_iblk_delayed(v, v->pq);
2819
2820             if (get_bits_count(&s->gb) > v->bits) {
2821                 // TODO: may need modification to handle slice coding
2822                 ff_er_add_slice(&s->er, 0, s->start_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR);
2823                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n",
2824                        get_bits_count(&s->gb), v->bits);
2825                 return;
2826             }
2827         }
2828         if (!v->s.loop_filter)
2829             ff_mpeg_draw_horiz_band(s, s->mb_y * 16, 16);
2830         else if (s->mb_y)
2831             ff_mpeg_draw_horiz_band(s, (s->mb_y-1) * 16, 16);
2832         s->first_slice_line = 0;
2833     }
2834
2835     /* raw bottom MB row */
2836     s->mb_x = 0;
2837     init_block_index(v);
2838
2839     for (;s->mb_x < s->mb_width; s->mb_x++) {
2840         ff_update_block_index(s);
2841         vc1_put_signed_blocks_clamped(v);
2842         if (v->s.loop_filter)
2843             ff_vc1_loop_filter_iblk_delayed(v, v->pq);
2844     }
2845     if (v->s.loop_filter)
2846         ff_mpeg_draw_horiz_band(s, (s->end_mb_y-1)*16, 16);
2847     ff_er_add_slice(&s->er, 0, s->start_mb_y << v->field_mode, s->mb_width - 1,
2848                     (s->end_mb_y << v->field_mode) - 1, ER_MB_END);
2849 }
2850
2851 static void vc1_decode_p_blocks(VC1Context *v)
2852 {
2853     MpegEncContext *s = &v->s;
2854     int apply_loop_filter;
2855
2856     /* select codingmode used for VLC tables selection */
2857     switch (v->c_ac_table_index) {
2858     case 0:
2859         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;
2860         break;
2861     case 1:
2862         v->codingset = CS_HIGH_MOT_INTRA;
2863         break;
2864     case 2:
2865         v->codingset = CS_MID_RATE_INTRA;
2866         break;
2867     }
2868
2869     switch (v->c_ac_table_index) {
2870     case 0:
2871         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;
2872         break;
2873     case 1:
2874         v->codingset2 = CS_HIGH_MOT_INTER;
2875         break;
2876     case 2:
2877         v->codingset2 = CS_MID_RATE_INTER;
2878         break;
2879     }
2880
2881     apply_loop_filter   = s->loop_filter && !(s->avctx->skip_loop_filter >= AVDISCARD_NONKEY) &&
2882                           v->fcm == PROGRESSIVE;
2883     s->first_slice_line = 1;
2884     memset(v->cbp_base, 0, sizeof(v->cbp_base[0])*2*s->mb_stride);
2885     for (s->mb_y = s->start_mb_y; s->mb_y < s->end_mb_y; s->mb_y++) {
2886         s->mb_x = 0;
2887         init_block_index(v);
2888         for (; s->mb_x < s->mb_width; s->mb_x++) {
2889             ff_update_block_index(s);
2890
2891             if (v->fcm == ILACE_FIELD)
2892                 vc1_decode_p_mb_intfi(v);
2893             else if (v->fcm == ILACE_FRAME)
2894                 vc1_decode_p_mb_intfr(v);
2895             else vc1_decode_p_mb(v);
2896             if (s->mb_y != s->start_mb_y && apply_loop_filter)
2897                 ff_vc1_apply_p_loop_filter(v);
2898             if (get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {
2899                 // TODO: may need modification to handle slice coding
2900                 ff_er_add_slice(&s->er, 0, s->start_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR);
2901                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i at %ix%i\n",
2902                        get_bits_count(&s->gb), v->bits, s->mb_x, s->mb_y);
2903                 return;
2904             }
2905         }
2906         memmove(v->cbp_base,      v->cbp,      sizeof(v->cbp_base[0])      * s->mb_stride);
2907         memmove(v->ttblk_base,    v->ttblk,    sizeof(v->ttblk_base[0])    * s->mb_stride);
2908         memmove(v->is_intra_base, v->is_intra, sizeof(v->is_intra_base[0]) * s->mb_stride);
2909         memmove(v->luma_mv_base,  v->luma_mv,  sizeof(v->luma_mv_base[0])  * s->mb_stride);
2910         if (s->mb_y != s->start_mb_y) ff_mpeg_draw_horiz_band(s, (s->mb_y - 1) * 16, 16);
2911         s->first_slice_line = 0;
2912     }
2913     if (apply_loop_filter) {
2914         s->mb_x = 0;
2915         init_block_index(v);
2916         for (; s->mb_x < s->mb_width; s->mb_x++) {
2917             ff_update_block_index(s);
2918             ff_vc1_apply_p_loop_filter(v);
2919         }
2920     }
2921     if (s->end_mb_y >= s->start_mb_y)
2922         ff_mpeg_draw_horiz_band(s, (s->end_mb_y - 1) * 16, 16);
2923     ff_er_add_slice(&s->er, 0, s->start_mb_y << v->field_mode, s->mb_width - 1,
2924                     (s->end_mb_y << v->field_mode) - 1, ER_MB_END);
2925 }
2926
2927 static void vc1_decode_b_blocks(VC1Context *v)
2928 {
2929     MpegEncContext *s = &v->s;
2930
2931     /* select codingmode used for VLC tables selection */
2932     switch (v->c_ac_table_index) {
2933     case 0:
2934         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;
2935         break;
2936     case 1:
2937         v->codingset = CS_HIGH_MOT_INTRA;
2938         break;
2939     case 2:
2940         v->codingset = CS_MID_RATE_INTRA;
2941         break;
2942     }
2943
2944     switch (v->c_ac_table_index) {
2945     case 0:
2946         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;
2947         break;
2948     case 1:
2949         v->codingset2 = CS_HIGH_MOT_INTER;
2950         break;
2951     case 2:
2952         v->codingset2 = CS_MID_RATE_INTER;
2953         break;
2954     }
2955
2956     s->first_slice_line = 1;
2957     for (s->mb_y = s->start_mb_y; s->mb_y < s->end_mb_y; s->mb_y++) {
2958         s->mb_x = 0;
2959         init_block_index(v);
2960         for (; s->mb_x < s->mb_width; s->mb_x++) {
2961             ff_update_block_index(s);
2962
2963             if (v->fcm == ILACE_FIELD)
2964                 vc1_decode_b_mb_intfi(v);
2965             else if (v->fcm == ILACE_FRAME)
2966                 vc1_decode_b_mb_intfr(v);
2967             else
2968                 vc1_decode_b_mb(v);
2969             if (get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {
2970                 // TODO: may need modification to handle slice coding
2971                 ff_er_add_slice(&s->er, 0, s->start_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR);
2972                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i at %ix%i\n",
2973                        get_bits_count(&s->gb), v->bits, s->mb_x, s->mb_y);
2974                 return;
2975             }
2976             if (v->s.loop_filter)
2977                 ff_vc1_loop_filter_iblk(v, v->pq);
2978         }
2979         if (!v->s.loop_filter)
2980             ff_mpeg_draw_horiz_band(s, s->mb_y * 16, 16);
2981         else if (s->mb_y)
2982             ff_mpeg_draw_horiz_band(s, (s->mb_y - 1) * 16, 16);
2983         s->first_slice_line = 0;
2984     }
2985     if (v->s.loop_filter)
2986         ff_mpeg_draw_horiz_band(s, (s->end_mb_y - 1) * 16, 16);
2987     ff_er_add_slice(&s->er, 0, s->start_mb_y << v->field_mode, s->mb_width - 1,
2988                     (s->end_mb_y << v->field_mode) - 1, ER_MB_END);
2989 }
2990
2991 static void vc1_decode_skip_blocks(VC1Context *v)
2992 {
2993     MpegEncContext *s = &v->s;
2994
2995     if (!v->s.last_picture.f->data[0])
2996         return;
2997
2998     ff_er_add_slice(&s->er, 0, s->start_mb_y, s->mb_width - 1, s->end_mb_y - 1, ER_MB_END);
2999     s->first_slice_line = 1;
3000     for (s->mb_y = s->start_mb_y; s->mb_y < s->end_mb_y; s->mb_y++) {
3001         s->mb_x = 0;
3002         init_block_index(v);
3003         ff_update_block_index(s);
3004         memcpy(s->dest[0], s->last_picture.f->data[0] + s->mb_y * 16 * s->linesize,   s->linesize   * 16);
3005         memcpy(s->dest[1], s->last_picture.f->data[1] + s->mb_y *  8 * s->uvlinesize, s->uvlinesize *  8);
3006         memcpy(s->dest[2], s->last_picture.f->data[2] + s->mb_y *  8 * s->uvlinesize, s->uvlinesize *  8);
3007         ff_mpeg_draw_horiz_band(s, s->mb_y * 16, 16);
3008         s->first_slice_line = 0;
3009     }
3010     s->pict_type = AV_PICTURE_TYPE_P;
3011 }
3012
3013 void ff_vc1_decode_blocks(VC1Context *v)
3014 {
3015
3016     v->s.esc3_level_length = 0;
3017     if (v->x8_type) {
3018         ff_intrax8_decode_picture(&v->x8, 2*v->pq + v->halfpq, v->pq * !v->pquantizer);
3019     } else {
3020         v->cur_blk_idx     =  0;
3021         v->left_blk_idx    = -1;
3022         v->topleft_blk_idx =  1;
3023         v->top_blk_idx     =  2;
3024         switch (v->s.pict_type) {
3025         case AV_PICTURE_TYPE_I:
3026             if (v->profile == PROFILE_ADVANCED)
3027                 vc1_decode_i_blocks_adv(v);
3028             else
3029                 vc1_decode_i_blocks(v);
3030             break;
3031         case AV_PICTURE_TYPE_P:
3032             if (v->p_frame_skipped)
3033                 vc1_decode_skip_blocks(v);
3034             else
3035                 vc1_decode_p_blocks(v);
3036             break;
3037         case AV_PICTURE_TYPE_B:
3038             if (v->bi_type) {
3039                 if (v->profile == PROFILE_ADVANCED)
3040                     vc1_decode_i_blocks_adv(v);
3041                 else
3042                     vc1_decode_i_blocks(v);
3043             } else
3044                 vc1_decode_b_blocks(v);
3045             break;
3046         }
3047     }
3048 }