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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 uint8_t offset_table[2][9] = {
  44     {  0,  1,  2,  4,  8, 16, 32,  64, 128 },
  45     {  0,  1,  3,  7, 15, 31, 63, 127, 255 },
  46 };
  47
  48 /***********************************************************************/
  49 /**
  50  * @name VC-1 Bitplane decoding
  51  * @see 8.7, p56
  52  * @{
  53  */
  54
  55
  56 static inline void init_block_index(VC1Context *v)
  57 {
  58     MpegEncContext *s = &v->s;
  59     ff_init_block_index(s);
  60     if (v->field_mode && !(v->second_field ^ v->tff)) {
  61         s->dest[0] += s->current_picture_ptr->f->linesize[0];
  62         s->dest[1] += s->current_picture_ptr->f->linesize[1];
  63         s->dest[2] += s->current_picture_ptr->f->linesize[2];
  64     }
  65 }
  66
  67 /** @} */ //Bitplane group
  68
  69 static void vc1_put_signed_blocks_clamped(VC1Context *v)
  70 {
  71     MpegEncContext *s = &v->s;
  72     uint8_t *dest;
  73     int block_count = CONFIG_GRAY && (s->avctx->flags & AV_CODEC_FLAG_GRAY) ? 4 : 6;
  74     int fieldtx = 0;
  75     int i;
  76
  77     /* The put pixels loop is one MB row and one MB column behind the decoding
  78      * loop because we can only put pixels when overlap filtering is done. For
  79      * interlaced frame pictures, however, the put pixels loop is only one
  80      * column behind the decoding loop as interlaced frame pictures only need
  81      * horizontal overlap filtering. */
  82     if (!s->first_slice_line && v->fcm != ILACE_FRAME) {
  83         if (s->mb_x) {
  84             for (i = 0; i < block_count; i++) {
  85                 if (i > 3 ? v->mb_type[0][s->block_index[i] - s->block_wrap[i] - 1] :
  86                             v->mb_type[0][s->block_index[i] - 2 * s->block_wrap[i] - 2]) {
  87                     dest = s->dest[0] + ((i & 2) - 4) * 4 * s->linesize + ((i & 1) - 2) * 8;
  88                     s->idsp.put_signed_pixels_clamped(v->block[v->topleft_blk_idx][i],
  89                                                       i > 3 ? s->dest[i - 3] - 8 * s->uvlinesize - 8 : dest,
  90                                                       i > 3 ? s->uvlinesize : s->linesize);
  91                 }
  92             }
  93         }
  94         if (s->mb_x == s->mb_width - 1) {
  95             for (i = 0; i < block_count; i++) {
  96                 if (i > 3 ? v->mb_type[0][s->block_index[i] - s->block_wrap[i]] :
  97                             v->mb_type[0][s->block_index[i] - 2 * s->block_wrap[i]]) {
  98                     dest = s->dest[0] + ((i & 2) - 4) * 4 * s->linesize + (i & 1) * 8;
  99                     s->idsp.put_signed_pixels_clamped(v->block[v->top_blk_idx][i],
 100                                                       i > 3 ? s->dest[i - 3] - 8 * s->uvlinesize : dest,
 101                                                       i > 3 ? s->uvlinesize : s->linesize);
 102                 }
 103             }
 104         }
 105     }
 106     if (s->mb_y == s->end_mb_y - 1 || v->fcm == ILACE_FRAME) {
 107         if (s->mb_x) {
 108             if (v->fcm == ILACE_FRAME)
 109                 fieldtx = v->fieldtx_plane[s->mb_y * s->mb_stride + s->mb_x - 1];
 110             for (i = 0; i < block_count; i++) {
 111                 if (i > 3 ? v->mb_type[0][s->block_index[i] - 1] :
 112                             v->mb_type[0][s->block_index[i] - 2]) {
 113                     if (fieldtx)
 114                         dest = s->dest[0] + ((i & 2) >> 1) * s->linesize + ((i & 1) - 2) * 8;
 115                     else
 116                         dest = s->dest[0] + (i & 2) * 4 * s->linesize + ((i & 1) - 2) * 8;
 117                     s->idsp.put_signed_pixels_clamped(v->block[v->left_blk_idx][i],
 118                                                       i > 3 ? s->dest[i - 3] - 8 : dest,
 119                                                       i > 3 ? s->uvlinesize : s->linesize << fieldtx);
 120                 }
 121             }
 122         }
 123         if (s->mb_x == s->mb_width - 1) {
 124             if (v->fcm == ILACE_FRAME)
 125                 fieldtx = v->fieldtx_plane[s->mb_y * s->mb_stride + s->mb_x];
 126             for (i = 0; i < block_count; i++) {
 127                 if (v->mb_type[0][s->block_index[i]]) {
 128                     if (fieldtx)
 129                         dest = s->dest[0] + ((i & 2) >> 1) * s->linesize + (i & 1) * 8;
 130                     else
 131                         dest = s->dest[0] + (i & 2) * 4 * s->linesize + (i & 1) * 8;
 132                     s->idsp.put_signed_pixels_clamped(v->block[v->cur_blk_idx][i],
 133                                                       i > 3 ? s->dest[i - 3] : dest,
 134                                                       i > 3 ? s->uvlinesize : s->linesize << fieldtx);
 135                 }
 136             }
 137         }
 138     }
 139 }
 140
 141 #define inc_blk_idx(idx) do { \
 142         idx++; \
 143         if (idx >= v->n_allocated_blks) \
 144             idx = 0; \
 145     } while (0)
 146
 147 /***********************************************************************/
 148 /**
 149  * @name VC-1 Block-level functions
 150  * @see 7.1.4, p91 and 8.1.1.7, p(1)04
 151  * @{
 152  */
 153
 154 /**
 155  * @def GET_MQUANT
 156  * @brief Get macroblock-level quantizer scale
 157  */
 158 #define GET_MQUANT()                                           \
 159     if (v->dquantfrm) {                                        \
 160         int edges = 0;                                         \
 161         if (v->dqprofile == DQPROFILE_ALL_MBS) {               \
 162             if (v->dqbilevel) {                                \
 163                 mquant = (get_bits1(gb)) ? v->altpq : v->pq;   \
 164             } else {                                           \
 165                 mqdiff = get_bits(gb, 3);                      \
 166                 if (mqdiff != 7)                               \
 167                     mquant = v->pq + mqdiff;                   \
 168                 else                                           \
 169                     mquant = get_bits(gb, 5);                  \
 170             }                                                  \
 171         }                                                      \
 172         if (v->dqprofile == DQPROFILE_SINGLE_EDGE)             \
 173             edges = 1 << v->dqsbedge;                          \
 174         else if (v->dqprofile == DQPROFILE_DOUBLE_EDGES)       \
 175             edges = (3 << v->dqsbedge) % 15;                   \
 176         else if (v->dqprofile == DQPROFILE_FOUR_EDGES)         \
 177             edges = 15;                                        \
 178         if ((edges&1) && !s->mb_x)                             \
 179             mquant = v->altpq;                                 \
 180         if ((edges&2) && s->first_slice_line)                  \
 181             mquant = v->altpq;                                 \
 182         if ((edges&4) && s->mb_x == (s->mb_width - 1))         \
 183             mquant = v->altpq;                                 \
 184         if ((edges&8) && s->mb_y == (s->mb_height - 1))        \
 185             mquant = v->altpq;                                 \
 186         if (!mquant || mquant > 31) {                          \
 187             av_log(v->s.avctx, AV_LOG_ERROR,                   \
 188                    "Overriding invalid mquant %d\n", mquant);  \
 189             mquant = 1;                                        \
 190         }                                                      \
 191     }
 192
 193 /**
 194  * @def GET_MVDATA(_dmv_x, _dmv_y)
 195  * @brief Get MV differentials
 196  * @see MVDATA decoding from 8.3.5.2, p(1)20
 197  * @param _dmv_x Horizontal differential for decoded MV
 198  * @param _dmv_y Vertical differential for decoded MV
 199  */
 200 #define GET_MVDATA(_dmv_x, _dmv_y)                                      \
 201     index = 1 + get_vlc2(gb, ff_vc1_mv_diff_vlc[s->mv_table_index].table, \
 202                          VC1_MV_DIFF_VLC_BITS, 2);                      \
 203     if (index > 36) {                                                   \
 204         mb_has_coeffs = 1;                                              \
 205         index -= 37;                                                    \
 206     } else                                                              \
 207         mb_has_coeffs = 0;                                              \
 208     s->mb_intra = 0;                                                    \
 209     if (!index) {                                                       \
 210         _dmv_x = _dmv_y = 0;                                            \
 211     } else if (index == 35) {                                           \
 212         _dmv_x = get_bits(gb, v->k_x - 1 + s->quarter_sample);          \
 213         _dmv_y = get_bits(gb, v->k_y - 1 + s->quarter_sample);          \
 214     } else if (index == 36) {                                           \
 215         _dmv_x = 0;                                                     \
 216         _dmv_y = 0;                                                     \
 217         s->mb_intra = 1;                                                \
 218     } else {                                                            \
 219         index1 = index % 6;                                             \
 220         _dmv_x = offset_table[1][index1];                               \
 221         val = size_table[index1] - (!s->quarter_sample && index1 == 5); \
 222         if (val > 0) {                                                  \
 223             val = get_bits(gb, val);                                    \
 224             sign = 0 - (val & 1);                                       \
 225             _dmv_x = (sign ^ ((val >> 1) + _dmv_x)) - sign;             \
 226         }                                                               \
 227                                                                         \
 228         index1 = index / 6;                                             \
 229         _dmv_y = offset_table[1][index1];                               \
 230         val = size_table[index1] - (!s->quarter_sample && index1 == 5); \
 231         if (val > 0) {                                                  \
 232             val = get_bits(gb, val);                                    \
 233             sign = 0 - (val & 1);                                       \
 234             _dmv_y = (sign ^ ((val >> 1) + _dmv_y)) - sign;             \
 235         }                                                               \
 236     }
 237
 238 static av_always_inline void get_mvdata_interlaced(VC1Context *v, int *dmv_x,
 239                                                    int *dmv_y, int *pred_flag)
 240 {
 241     int index, index1;
 242     int extend_x, extend_y;
 243     GetBitContext *gb = &v->s.gb;
 244     int bits, esc;
 245     int val, sign;
 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     extend_x = v->dmvrange & 1;
 255     extend_y = (v->dmvrange >> 1) & 1;
 256     index = get_vlc2(gb, v->imv_vlc->table, bits, 3);
 257     if (index == esc) {
 258         *dmv_x = get_bits(gb, v->k_x);
 259         *dmv_y = get_bits(gb, v->k_y);
 260         if (v->numref) {
 261             if (pred_flag)
 262                 *pred_flag = *dmv_y & 1;
 263             *dmv_y = (*dmv_y + (*dmv_y & 1)) >> 1;
 264         }
 265     }
 266     else {
 267         av_assert0(index < esc);
 268         index1 = (index + 1) % 9;
 269         if (index1 != 0) {
 270             val    = get_bits(gb, index1 + extend_x);
 271             sign   = 0 - (val & 1);
 272             *dmv_x = (sign ^ ((val >> 1) + offset_table[extend_x][index1])) - sign;
 273         } else
 274             *dmv_x = 0;
 275         index1 = (index + 1) / 9;
 276         if (index1 > v->numref) {
 277             val    = get_bits(gb, (index1 >> v->numref) + extend_y);
 278             sign   = 0 - (val & 1);
 279             *dmv_y = (sign ^ ((val >> 1) + offset_table[extend_y][index1 >> v->numref])) - sign;
 280         } else
 281             *dmv_y = 0;
 282         if (v->numref && pred_flag)
 283             *pred_flag = index1 & 1;
 284     }
 285 }
 286
 287 /** Reconstruct motion vector for B-frame and do motion compensation
 288  */
 289 static inline void vc1_b_mc(VC1Context *v, int dmv_x[2], int dmv_y[2],
 290                             int direct, int mode)
 291 {
 292     if (direct) {
 293         ff_vc1_mc_1mv(v, 0);
 294         ff_vc1_interp_mc(v);
 295         return;
 296     }
 297     if (mode == BMV_TYPE_INTERPOLATED) {
 298         ff_vc1_mc_1mv(v, 0);
 299         ff_vc1_interp_mc(v);
 300         return;
 301     }
 302
 303     ff_vc1_mc_1mv(v, (mode == BMV_TYPE_BACKWARD));
 304 }
 305
 306 /** Get predicted DC value for I-frames only
 307  * prediction dir: left=0, top=1
 308  * @param s MpegEncContext
 309  * @param overlap flag indicating that overlap filtering is used
 310  * @param pq integer part of picture quantizer
 311  * @param[in] n block index in the current MB
 312  * @param dc_val_ptr Pointer to DC predictor
 313  * @param dir_ptr Prediction direction for use in AC prediction
 314  */
 315 static inline int vc1_i_pred_dc(MpegEncContext *s, int overlap, int pq, int n,
 316                                 int16_t **dc_val_ptr, int *dir_ptr)
 317 {
 318     int a, b, c, wrap, pred, scale;
 319     int16_t *dc_val;
 320     static const uint16_t dcpred[32] = {
 321         -1, 1024,  512,  341,  256,  205,  171,  146,  128,
 322              114,  102,   93,   85,   79,   73,   68,   64,
 323               60,   57,   54,   51,   49,   47,   45,   43,
 324               41,   39,   38,   37,   35,   34,   33
 325     };
 326
 327     /* find prediction - wmv3_dc_scale always used here in fact */
 328     if (n < 4) scale = s->y_dc_scale;
 329     else       scale = s->c_dc_scale;
 330
 331     wrap   = s->block_wrap[n];
 332     dc_val = s->dc_val[0] + s->block_index[n];
 333
 334     /* B A
 335      * C X
 336      */
 337     c = dc_val[ - 1];
 338     b = dc_val[ - 1 - wrap];
 339     a = dc_val[ - wrap];
 340
 341     if (pq < 9 || !overlap) {
 342         /* Set outer values */
 343         if (s->first_slice_line && (n != 2 && n != 3))
 344             b = a = dcpred[scale];
 345         if (s->mb_x == 0 && (n != 1 && n != 3))
 346             b = c = dcpred[scale];
 347     } else {
 348         /* Set outer values */
 349         if (s->first_slice_line && (n != 2 && n != 3))
 350             b = a = 0;
 351         if (s->mb_x == 0 && (n != 1 && n != 3))
 352             b = c = 0;
 353     }
 354
 355     if (abs(a - b) <= abs(b - c)) {
 356         pred     = c;
 357         *dir_ptr = 1; // left
 358     } else {
 359         pred     = a;
 360         *dir_ptr = 0; // top
 361     }
 362
 363     /* update predictor */
 364     *dc_val_ptr = &dc_val[0];
 365     return pred;
 366 }
 367
 368
 369 /** Get predicted DC value
 370  * prediction dir: left=0, top=1
 371  * @param s MpegEncContext
 372  * @param overlap flag indicating that overlap filtering is used
 373  * @param pq integer part of picture quantizer
 374  * @param[in] n block index in the current MB
 375  * @param a_avail flag indicating top block availability
 376  * @param c_avail flag indicating left block availability
 377  * @param dc_val_ptr Pointer to DC predictor
 378  * @param dir_ptr Prediction direction for use in AC prediction
 379  */
 380 static inline int ff_vc1_pred_dc(MpegEncContext *s, int overlap, int pq, int n,
 381                               int a_avail, int c_avail,
 382                               int16_t **dc_val_ptr, int *dir_ptr)
 383 {
 384     int a, b, c, wrap, pred;
 385     int16_t *dc_val;
 386     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
 387     int q1, q2 = 0;
 388     int dqscale_index;
 389
 390     /* scale predictors if needed */
 391     q1 = s->current_picture.qscale_table[mb_pos];
 392     dqscale_index = s->y_dc_scale_table[q1] - 1;
 393     if (dqscale_index < 0)
 394         return 0;
 395
 396     wrap = s->block_wrap[n];
 397     dc_val = s->dc_val[0] + s->block_index[n];
 398
 399     /* B A
 400      * C X
 401      */
 402     c = dc_val[ - 1];
 403     b = dc_val[ - 1 - wrap];
 404     a = dc_val[ - wrap];
 405
 406     if (c_avail && (n != 1 && n != 3)) {
 407         q2 = s->current_picture.qscale_table[mb_pos - 1];
 408         if (q2 && q2 != q1)
 409             c = (c * s->y_dc_scale_table[q2] * ff_vc1_dqscale[dqscale_index] + 0x20000) >> 18;
 410     }
 411     if (a_avail && (n != 2 && n != 3)) {
 412         q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];
 413         if (q2 && q2 != q1)
 414             a = (a * s->y_dc_scale_table[q2] * ff_vc1_dqscale[dqscale_index] + 0x20000) >> 18;
 415     }
 416     if (a_avail && c_avail && (n != 3)) {
 417         int off = mb_pos;
 418         if (n != 1)
 419             off--;
 420         if (n != 2)
 421             off -= s->mb_stride;
 422         q2 = s->current_picture.qscale_table[off];
 423         if (q2 && q2 != q1)
 424             b = (b * s->y_dc_scale_table[q2] * ff_vc1_dqscale[dqscale_index] + 0x20000) >> 18;
 425     }
 426
 427     if (c_avail && (!a_avail || abs(a - b) <= abs(b - c))) {
 428         pred     = c;
 429         *dir_ptr = 1; // left
 430     } else if (a_avail) {
 431         pred     = a;
 432         *dir_ptr = 0; // top
 433     } else {
 434         pred     = 0;
 435         *dir_ptr = 1; // left
 436     }
 437
 438     /* update predictor */
 439     *dc_val_ptr = &dc_val[0];
 440     return pred;
 441 }
 442
 443 /** @} */ // Block group
 444
 445 /**
 446  * @name VC1 Macroblock-level functions in Simple/Main Profiles
 447  * @see 7.1.4, p91 and 8.1.1.7, p(1)04
 448  * @{
 449  */
 450
 451 static inline int vc1_coded_block_pred(MpegEncContext * s, int n,
 452                                        uint8_t **coded_block_ptr)
 453 {
 454     int xy, wrap, pred, a, b, c;
 455
 456     xy   = s->block_index[n];
 457     wrap = s->b8_stride;
 458
 459     /* B C
 460      * A X
 461      */
 462     a = s->coded_block[xy - 1       ];
 463     b = s->coded_block[xy - 1 - wrap];
 464     c = s->coded_block[xy     - wrap];
 465
 466     if (b == c) {
 467         pred = a;
 468     } else {
 469         pred = c;
 470     }
 471
 472     /* store value */
 473     *coded_block_ptr = &s->coded_block[xy];
 474
 475     return pred;
 476 }
 477
 478 /**
 479  * Decode one AC coefficient
 480  * @param v The VC1 context
 481  * @param last Last coefficient
 482  * @param skip How much zero coefficients to skip
 483  * @param value Decoded AC coefficient value
 484  * @param codingset set of VLC to decode data
 485  * @see 8.1.3.4
 486  */
 487 static void vc1_decode_ac_coeff(VC1Context *v, int *last, int *skip,
 488                                 int *value, int codingset)
 489 {
 490     GetBitContext *gb = &v->s.gb;
 491     int index, run, level, lst, sign;
 492
 493     index = get_vlc2(gb, ff_vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);
 494     if (index != ff_vc1_ac_sizes[codingset] - 1) {
 495         run   = vc1_index_decode_table[codingset][index][0];
 496         level = vc1_index_decode_table[codingset][index][1];
 497         lst   = index >= vc1_last_decode_table[codingset] || get_bits_left(gb) < 0;
 498         sign  = get_bits1(gb);
 499     } else {
 500         int escape = decode210(gb);
 501         if (escape != 2) {
 502             index = get_vlc2(gb, ff_vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);
 503             run   = vc1_index_decode_table[codingset][index][0];
 504             level = vc1_index_decode_table[codingset][index][1];
 505             lst   = index >= vc1_last_decode_table[codingset];
 506             if (escape == 0) {
 507                 if (lst)
 508                     level += vc1_last_delta_level_table[codingset][run];
 509                 else
 510                     level += vc1_delta_level_table[codingset][run];
 511             } else {
 512                 if (lst)
 513                     run += vc1_last_delta_run_table[codingset][level] + 1;
 514                 else
 515                     run += vc1_delta_run_table[codingset][level] + 1;
 516             }
 517             sign = get_bits1(gb);
 518         } else {
 519             lst = get_bits1(gb);
 520             if (v->s.esc3_level_length == 0) {
 521                 if (v->pq < 8 || v->dquantfrm) { // table 59
 522                     v->s.esc3_level_length = get_bits(gb, 3);
 523                     if (!v->s.esc3_level_length)
 524                         v->s.esc3_level_length = get_bits(gb, 2) + 8;
 525                 } else { // table 60
 526                     v->s.esc3_level_length = get_unary(gb, 1, 6) + 2;
 527                 }
 528                 v->s.esc3_run_length = 3 + get_bits(gb, 2);
 529             }
 530             run   = get_bits(gb, v->s.esc3_run_length);
 531             sign  = get_bits1(gb);
 532             level = get_bits(gb, v->s.esc3_level_length);
 533         }
 534     }
 535
 536     *last  = lst;
 537     *skip  = run;
 538     *value = (level ^ -sign) + sign;
 539 }
 540
 541 /** Decode intra block in intra frames - should be faster than decode_intra_block
 542  * @param v VC1Context
 543  * @param block block to decode
 544  * @param[in] n subblock index
 545  * @param coded are AC coeffs present or not
 546  * @param codingset set of VLC to decode data
 547  */
 548 static int vc1_decode_i_block(VC1Context *v, int16_t block[64], int n,
 549                               int coded, int codingset)
 550 {
 551     GetBitContext *gb = &v->s.gb;
 552     MpegEncContext *s = &v->s;
 553     int dc_pred_dir = 0; /* Direction of the DC prediction used */
 554     int i;
 555     int16_t *dc_val;
 556     int16_t *ac_val, *ac_val2;
 557     int dcdiff, scale;
 558
 559     /* Get DC differential */
 560     if (n < 4) {
 561         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);
 562     } else {
 563         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);
 564     }
 565     if (dcdiff < 0) {
 566         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");
 567         return -1;
 568     }
 569     if (dcdiff) {
 570         const int m = (v->pq == 1 || v->pq == 2) ? 3 - v->pq : 0;
 571         if (dcdiff == 119 /* ESC index value */) {
 572             dcdiff = get_bits(gb, 8 + m);
 573         } else {
 574             if (m)
 575                 dcdiff = (dcdiff << m) + get_bits(gb, m) - ((1 << m) - 1);
 576         }
 577         if (get_bits1(gb))
 578             dcdiff = -dcdiff;
 579     }
 580
 581     /* Prediction */
 582     dcdiff += vc1_i_pred_dc(&v->s, v->overlap, v->pq, n, &dc_val, &dc_pred_dir);
 583     *dc_val = dcdiff;
 584
 585     /* Store the quantized DC coeff, used for prediction */
 586     if (n < 4)
 587         scale = s->y_dc_scale;
 588     else
 589         scale = s->c_dc_scale;
 590     block[0] = dcdiff * scale;
 591
 592     ac_val  = s->ac_val[0][s->block_index[n]];
 593     ac_val2 = ac_val;
 594     if (dc_pred_dir) // left
 595         ac_val -= 16;
 596     else // top
 597         ac_val -= 16 * s->block_wrap[n];
 598
 599     scale = v->pq * 2 + v->halfpq;
 600
 601     //AC Decoding
 602     i = !!coded;
 603
 604     if (coded) {
 605         int last = 0, skip, value;
 606         const uint8_t *zz_table;
 607         int k;
 608
 609         if (v->s.ac_pred) {
 610             if (!dc_pred_dir)
 611                 zz_table = v->zz_8x8[2];
 612             else
 613                 zz_table = v->zz_8x8[3];
 614         } else
 615             zz_table = v->zz_8x8[1];
 616
 617         while (!last) {
 618             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);
 619             i += skip;
 620             if (i > 63)
 621                 break;
 622             block[zz_table[i++]] = value;
 623         }
 624
 625         /* apply AC prediction if needed */
 626         if (s->ac_pred) {
 627             int sh;
 628             if (dc_pred_dir) { // left
 629                 sh = v->left_blk_sh;
 630             } else { // top
 631                 sh = v->top_blk_sh;
 632                 ac_val += 8;
 633             }
 634             for (k = 1; k < 8; k++)
 635                 block[k << sh] += ac_val[k];
 636         }
 637         /* save AC coeffs for further prediction */
 638         for (k = 1; k < 8; k++) {
 639             ac_val2[k]     = block[k << v->left_blk_sh];
 640             ac_val2[k + 8] = block[k << v->top_blk_sh];
 641         }
 642
 643         /* scale AC coeffs */
 644         for (k = 1; k < 64; k++)
 645             if (block[k]) {
 646                 block[k] *= scale;
 647                 if (!v->pquantizer)
 648                     block[k] += (block[k] < 0) ? -v->pq : v->pq;
 649             }
 650
 651     } else {
 652         int k;
 653
 654         memset(ac_val2, 0, 16 * 2);
 655
 656         /* apply AC prediction if needed */
 657         if (s->ac_pred) {
 658             int sh;
 659             if (dc_pred_dir) { //left
 660                 sh = v->left_blk_sh;
 661             } else { // top
 662                 sh = v->top_blk_sh;
 663                 ac_val  += 8;
 664                 ac_val2 += 8;
 665             }
 666             memcpy(ac_val2, ac_val, 8 * 2);
 667             for (k = 1; k < 8; k++) {
 668                 block[k << sh] = ac_val[k] * scale;
 669                 if (!v->pquantizer && block[k << sh])
 670                     block[k << sh] += (block[k << sh] < 0) ? -v->pq : v->pq;
 671             }
 672         }
 673     }
 674     if (s->ac_pred) i = 63;
 675     s->block_last_index[n] = i;
 676
 677     return 0;
 678 }
 679
 680 /** Decode intra block in intra frames - should be faster than decode_intra_block
 681  * @param v VC1Context
 682  * @param block block to decode
 683  * @param[in] n subblock number
 684  * @param coded are AC coeffs present or not
 685  * @param codingset set of VLC to decode data
 686  * @param mquant quantizer value for this macroblock
 687  */
 688 static int vc1_decode_i_block_adv(VC1Context *v, int16_t block[64], int n,
 689                                   int coded, int codingset, int mquant)
 690 {
 691     GetBitContext *gb = &v->s.gb;
 692     MpegEncContext *s = &v->s;
 693     int dc_pred_dir = 0; /* Direction of the DC prediction used */
 694     int i;
 695     int16_t *dc_val = NULL;
 696     int16_t *ac_val, *ac_val2;
 697     int dcdiff;
 698     int a_avail = v->a_avail, c_avail = v->c_avail;
 699     int use_pred = s->ac_pred;
 700     int scale;
 701     int q1, q2 = 0;
 702     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
 703
 704     /* Get DC differential */
 705     if (n < 4) {
 706         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);
 707     } else {
 708         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);
 709     }
 710     if (dcdiff < 0) {
 711         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");
 712         return -1;
 713     }
 714     if (dcdiff) {
 715         const int m = (mquant == 1 || mquant == 2) ? 3 - mquant : 0;
 716         if (dcdiff == 119 /* ESC index value */) {
 717             dcdiff = get_bits(gb, 8 + m);
 718         } else {
 719             if (m)
 720                 dcdiff = (dcdiff << m) + get_bits(gb, m) - ((1 << m) - 1);
 721         }
 722         if (get_bits1(gb))
 723             dcdiff = -dcdiff;
 724     }
 725
 726     /* Prediction */
 727     dcdiff += ff_vc1_pred_dc(&v->s, v->overlap, mquant, n, v->a_avail, v->c_avail, &dc_val, &dc_pred_dir);
 728     *dc_val = dcdiff;
 729
 730     /* Store the quantized DC coeff, used for prediction */
 731     if (n < 4)
 732         scale = s->y_dc_scale;
 733     else
 734         scale = s->c_dc_scale;
 735     block[0] = dcdiff * scale;
 736
 737     /* check if AC is needed at all */
 738     if (!a_avail && !c_avail)
 739         use_pred = 0;
 740
 741     scale = mquant * 2 + ((mquant == v->pq) ? v->halfpq : 0);
 742
 743     ac_val  = s->ac_val[0][s->block_index[n]];
 744     ac_val2 = ac_val;
 745     if (dc_pred_dir) // left
 746         ac_val -= 16;
 747     else // top
 748         ac_val -= 16 * s->block_wrap[n];
 749
 750     q1 = s->current_picture.qscale_table[mb_pos];
 751     if (n == 3)
 752         q2 = q1;
 753     else if (dc_pred_dir) {
 754         if (n == 1)
 755             q2 = q1;
 756         else if (c_avail && mb_pos)
 757             q2 = s->current_picture.qscale_table[mb_pos - 1];
 758     } else {
 759         if (n == 2)
 760             q2 = q1;
 761         else if (a_avail && mb_pos >= s->mb_stride)
 762             q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];
 763     }
 764
 765     //AC Decoding
 766     i = 1;
 767
 768     if (coded) {
 769         int last = 0, skip, value;
 770         const uint8_t *zz_table;
 771         int k;
 772
 773         if (v->s.ac_pred) {
 774             if (!use_pred && v->fcm == ILACE_FRAME) {
 775                 zz_table = v->zzi_8x8;
 776             } else {
 777                 if (!dc_pred_dir) // top
 778                     zz_table = v->zz_8x8[2];
 779                 else // left
 780                     zz_table = v->zz_8x8[3];
 781             }
 782         } else {
 783             if (v->fcm != ILACE_FRAME)
 784                 zz_table = v->zz_8x8[1];
 785             else
 786                 zz_table = v->zzi_8x8;
 787         }
 788
 789         while (!last) {
 790             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);
 791             i += skip;
 792             if (i > 63)
 793                 break;
 794             block[zz_table[i++]] = value;
 795         }
 796
 797         /* apply AC prediction if needed */
 798         if (use_pred) {
 799             int sh;
 800             if (dc_pred_dir) { // left
 801                 sh = v->left_blk_sh;
 802             } else { // top
 803                 sh = v->top_blk_sh;
 804                 ac_val += 8;
 805             }
 806             /* scale predictors if needed*/
 807             if (q2 && q1 != q2) {
 808                 q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;
 809                 if (q1 < 1)
 810                     return AVERROR_INVALIDDATA;
 811                 q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;
 812                 for (k = 1; k < 8; k++)
 813                     block[k << sh] += (ac_val[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;
 814             } else {
 815                 for (k = 1; k < 8; k++)
 816                     block[k << sh] += ac_val[k];
 817             }
 818         }
 819         /* save AC coeffs for further prediction */
 820         for (k = 1; k < 8; k++) {
 821             ac_val2[k    ] = block[k << v->left_blk_sh];
 822             ac_val2[k + 8] = block[k << v->top_blk_sh];
 823         }
 824
 825         /* scale AC coeffs */
 826         for (k = 1; k < 64; k++)
 827             if (block[k]) {
 828                 block[k] *= scale;
 829                 if (!v->pquantizer)
 830                     block[k] += (block[k] < 0) ? -mquant : mquant;
 831             }
 832
 833     } else { // no AC coeffs
 834         int k;
 835
 836         memset(ac_val2, 0, 16 * 2);
 837
 838         /* apply AC prediction if needed */
 839         if (use_pred) {
 840             int sh;
 841             if (dc_pred_dir) { // left
 842                 sh = v->left_blk_sh;
 843             } else { // top
 844                 sh = v->top_blk_sh;
 845                 ac_val  += 8;
 846                 ac_val2 += 8;
 847             }
 848             memcpy(ac_val2, ac_val, 8 * 2);
 849             if (q2 && q1 != q2) {
 850                 q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;
 851                 q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;
 852                 if (q1 < 1)
 853                     return AVERROR_INVALIDDATA;
 854                 for (k = 1; k < 8; k++)
 855                     ac_val2[k] = (ac_val2[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;
 856             }
 857             for (k = 1; k < 8; k++) {
 858                 block[k << sh] = ac_val2[k] * scale;
 859                 if (!v->pquantizer && block[k << sh])
 860                     block[k << sh] += (block[k << sh] < 0) ? -mquant : mquant;
 861             }
 862         }
 863     }
 864     if (use_pred) i = 63;
 865     s->block_last_index[n] = i;
 866
 867     return 0;
 868 }
 869
 870 /** Decode intra block in inter frames - more generic version than vc1_decode_i_block
 871  * @param v VC1Context
 872  * @param block block to decode
 873  * @param[in] n subblock index
 874  * @param coded are AC coeffs present or not
 875  * @param mquant block quantizer
 876  * @param codingset set of VLC to decode data
 877  */
 878 static int vc1_decode_intra_block(VC1Context *v, int16_t block[64], int n,
 879                                   int coded, int mquant, int codingset)
 880 {
 881     GetBitContext *gb = &v->s.gb;
 882     MpegEncContext *s = &v->s;
 883     int dc_pred_dir = 0; /* Direction of the DC prediction used */
 884     int i;
 885     int16_t *dc_val = NULL;
 886     int16_t *ac_val, *ac_val2;
 887     int dcdiff;
 888     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
 889     int a_avail = v->a_avail, c_avail = v->c_avail;
 890     int use_pred = s->ac_pred;
 891     int scale;
 892     int q1, q2 = 0;
 893
 894     s->bdsp.clear_block(block);
 895
 896     /* XXX: Guard against dumb values of mquant */
 897     mquant = av_clip_uintp2(mquant, 5);
 898
 899     /* Set DC scale - y and c use the same */
 900     s->y_dc_scale = s->y_dc_scale_table[mquant];
 901     s->c_dc_scale = s->c_dc_scale_table[mquant];
 902
 903     /* Get DC differential */
 904     if (n < 4) {
 905         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);
 906     } else {
 907         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);
 908     }
 909     if (dcdiff < 0) {
 910         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");
 911         return -1;
 912     }
 913     if (dcdiff) {
 914         const int m = (mquant == 1 || mquant == 2) ? 3 - mquant : 0;
 915         if (dcdiff == 119 /* ESC index value */) {
 916             dcdiff = get_bits(gb, 8 + m);
 917         } else {
 918             if (m)
 919                 dcdiff = (dcdiff << m) + get_bits(gb, m) - ((1 << m) - 1);
 920         }
 921         if (get_bits1(gb))
 922             dcdiff = -dcdiff;
 923     }
 924
 925     /* Prediction */
 926     dcdiff += ff_vc1_pred_dc(&v->s, v->overlap, mquant, n, a_avail, c_avail, &dc_val, &dc_pred_dir);
 927     *dc_val = dcdiff;
 928
 929     /* Store the quantized DC coeff, used for prediction */
 930
 931     if (n < 4) {
 932         block[0] = dcdiff * s->y_dc_scale;
 933     } else {
 934         block[0] = dcdiff * s->c_dc_scale;
 935     }
 936
 937     //AC Decoding
 938     i = 1;
 939
 940     /* check if AC is needed at all and adjust direction if needed */
 941     if (!a_avail) dc_pred_dir = 1;
 942     if (!c_avail) dc_pred_dir = 0;
 943     if (!a_avail && !c_avail) use_pred = 0;
 944     ac_val = s->ac_val[0][s->block_index[n]];
 945     ac_val2 = ac_val;
 946
 947     scale = mquant * 2 + v->halfpq;
 948
 949     if (dc_pred_dir) //left
 950         ac_val -= 16;
 951     else //top
 952         ac_val -= 16 * s->block_wrap[n];
 953
 954     q1 = s->current_picture.qscale_table[mb_pos];
 955     if (dc_pred_dir && c_avail && mb_pos)
 956         q2 = s->current_picture.qscale_table[mb_pos - 1];
 957     if (!dc_pred_dir && a_avail && mb_pos >= s->mb_stride)
 958         q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];
 959     if (dc_pred_dir && n == 1)
 960         q2 = q1;
 961     if (!dc_pred_dir && n == 2)
 962         q2 = q1;
 963     if (n == 3) q2 = q1;
 964
 965     if (coded) {
 966         int last = 0, skip, value;
 967         int k;
 968
 969         while (!last) {
 970             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);
 971             i += skip;
 972             if (i > 63)
 973                 break;
 974             if (v->fcm == PROGRESSIVE)
 975                 block[v->zz_8x8[0][i++]] = value;
 976             else {
 977                 if (use_pred && (v->fcm == ILACE_FRAME)) {
 978                     if (!dc_pred_dir) // top
 979                         block[v->zz_8x8[2][i++]] = value;
 980                     else // left
 981                         block[v->zz_8x8[3][i++]] = value;
 982                 } else {
 983                     block[v->zzi_8x8[i++]] = value;
 984                 }
 985             }
 986         }
 987
 988         /* apply AC prediction if needed */
 989         if (use_pred) {
 990             /* scale predictors if needed*/
 991             if (q2 && q1 != q2) {
 992                 q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;
 993                 q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;
 994
 995                 if (q1 < 1)
 996                     return AVERROR_INVALIDDATA;
 997                 if (dc_pred_dir) { // left
 998                     for (k = 1; k < 8; k++)
 999                         block[k << v->left_blk_sh] += (ac_val[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;
1000                 } else { //top
1001                     for (k = 1; k < 8; k++)
1002                         block[k << v->top_blk_sh] += (ac_val[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;
1003                 }
1004             } else {
1005                 if (dc_pred_dir) { // left
1006                     for (k = 1; k < 8; k++)
1007                         block[k << v->left_blk_sh] += ac_val[k];
1008                 } else { // top
1009                     for (k = 1; k < 8; k++)
1010                         block[k << v->top_blk_sh] += ac_val[k + 8];
1011                 }
1012             }
1013         }
1014         /* save AC coeffs for further prediction */
1015         for (k = 1; k < 8; k++) {
1016             ac_val2[k    ] = block[k << v->left_blk_sh];
1017             ac_val2[k + 8] = block[k << v->top_blk_sh];
1018         }
1019
1020         /* scale AC coeffs */
1021         for (k = 1; k < 64; k++)
1022             if (block[k]) {
1023                 block[k] *= scale;
1024                 if (!v->pquantizer)
1025                     block[k] += (block[k] < 0) ? -mquant : mquant;
1026             }
1027
1028         if (use_pred) i = 63;
1029     } else { // no AC coeffs
1030         int k;
1031
1032         memset(ac_val2, 0, 16 * 2);
1033         if (dc_pred_dir) { // left
1034             if (use_pred) {
1035                 memcpy(ac_val2, ac_val, 8 * 2);
1036                 if (q2 && q1 != q2) {
1037                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;
1038                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;
1039                     if (q1 < 1)
1040                         return AVERROR_INVALIDDATA;
1041                     for (k = 1; k < 8; k++)
1042                         ac_val2[k] = (ac_val2[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;
1043                 }
1044             }
1045         } else { // top
1046             if (use_pred) {
1047                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);
1048                 if (q2 && q1 != q2) {
1049                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;
1050                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;
1051                     if (q1 < 1)
1052                         return AVERROR_INVALIDDATA;
1053                     for (k = 1; k < 8; k++)
1054                         ac_val2[k + 8] = (ac_val2[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;
1055                 }
1056             }
1057         }
1058
1059         /* apply AC prediction if needed */
1060         if (use_pred) {
1061             if (dc_pred_dir) { // left
1062                 for (k = 1; k < 8; k++) {
1063                     block[k << v->left_blk_sh] = ac_val2[k] * scale;
1064                     if (!v->pquantizer && block[k << v->left_blk_sh])
1065                         block[k << v->left_blk_sh] += (block[k << v->left_blk_sh] < 0) ? -mquant : mquant;
1066                 }
1067             } else { // top
1068                 for (k = 1; k < 8; k++) {
1069                     block[k << v->top_blk_sh] = ac_val2[k + 8] * scale;
1070                     if (!v->pquantizer && block[k << v->top_blk_sh])
1071                         block[k << v->top_blk_sh] += (block[k << v->top_blk_sh] < 0) ? -mquant : mquant;
1072                 }
1073             }
1074             i = 63;
1075         }
1076     }
1077     s->block_last_index[n] = i;
1078
1079     return 0;
1080 }
1081
1082 /** Decode P block
1083  */
1084 static int vc1_decode_p_block(VC1Context *v, int16_t block[64], int n,
1085                               int mquant, int ttmb, int first_block,
1086                               uint8_t *dst, int linesize, int skip_block,
1087                               int *ttmb_out)
1088 {
1089     MpegEncContext *s = &v->s;
1090     GetBitContext *gb = &s->gb;
1091     int i, j;
1092     int subblkpat = 0;
1093     int scale, off, idx, last, skip, value;
1094     int ttblk = ttmb & 7;
1095     int pat = 0;
1096
1097     s->bdsp.clear_block(block);
1098
1099     if (ttmb == -1) {
1100         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)];
1101     }
1102     if (ttblk == TT_4X4) {
1103         subblkpat = ~(get_vlc2(gb, ff_vc1_subblkpat_vlc[v->tt_index].table, VC1_SUBBLKPAT_VLC_BITS, 1) + 1);
1104     }
1105     if ((ttblk != TT_8X8 && ttblk != TT_4X4)
1106         && ((v->ttmbf || (ttmb != -1 && (ttmb & 8) && !first_block))
1107             || (!v->res_rtm_flag && !first_block))) {
1108         subblkpat = decode012(gb);
1109         if (subblkpat)
1110             subblkpat ^= 3; // swap decoded pattern bits
1111         if (ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM)
1112             ttblk = TT_8X4;
1113         if (ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT)
1114             ttblk = TT_4X8;
1115     }
1116     scale = 2 * mquant + ((v->pq == mquant) ? v->halfpq : 0);
1117
1118     // convert transforms like 8X4_TOP to generic TT and SUBBLKPAT
1119     if (ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM) {
1120         subblkpat = 2 - (ttblk == TT_8X4_TOP);
1121         ttblk     = TT_8X4;
1122     }
1123     if (ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT) {
1124         subblkpat = 2 - (ttblk == TT_4X8_LEFT);
1125         ttblk     = TT_4X8;
1126     }
1127     switch (ttblk) {
1128     case TT_8X8:
1129         pat  = 0xF;
1130         i    = 0;
1131         last = 0;
1132         while (!last) {
1133             vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);
1134             i += skip;
1135             if (i > 63)
1136                 break;
1137             if (!v->fcm)
1138                 idx = v->zz_8x8[0][i++];
1139             else
1140                 idx = v->zzi_8x8[i++];
1141             block[idx] = value * scale;
1142             if (!v->pquantizer)
1143                 block[idx] += (block[idx] < 0) ? -mquant : mquant;
1144         }
1145         if (!skip_block) {
1146             if (i == 1)
1147                 v->vc1dsp.vc1_inv_trans_8x8_dc(dst, linesize, block);
1148             else {
1149                 v->vc1dsp.vc1_inv_trans_8x8(block);
1150                 s->idsp.add_pixels_clamped(block, dst, linesize);
1151             }
1152         }
1153         break;
1154     case TT_4X4:
1155         pat = ~subblkpat & 0xF;
1156         for (j = 0; j < 4; j++) {
1157             last = subblkpat & (1 << (3 - j));
1158             i    = 0;
1159             off  = (j & 1) * 4 + (j & 2) * 16;
1160             while (!last) {
1161                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);
1162                 i += skip;
1163                 if (i > 15)
1164                     break;
1165                 if (!v->fcm)
1166                     idx = ff_vc1_simple_progressive_4x4_zz[i++];
1167                 else
1168                     idx = ff_vc1_adv_interlaced_4x4_zz[i++];
1169                 block[idx + off] = value * scale;
1170                 if (!v->pquantizer)
1171                     block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;
1172             }
1173             if (!(subblkpat & (1 << (3 - j))) && !skip_block) {
1174                 if (i == 1)
1175                     v->vc1dsp.vc1_inv_trans_4x4_dc(dst + (j & 1) * 4 + (j & 2) * 2 * linesize, linesize, block + off);
1176                 else
1177                     v->vc1dsp.vc1_inv_trans_4x4(dst + (j & 1) * 4 + (j & 2) *  2 * linesize, linesize, block + off);
1178             }
1179         }
1180         break;
1181     case TT_8X4:
1182         pat = ~((subblkpat & 2) * 6 + (subblkpat & 1) * 3) & 0xF;
1183         for (j = 0; j < 2; j++) {
1184             last = subblkpat & (1 << (1 - j));
1185             i    = 0;
1186             off  = j * 32;
1187             while (!last) {
1188                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);
1189                 i += skip;
1190                 if (i > 31)
1191                     break;
1192                 if (!v->fcm)
1193                     idx = v->zz_8x4[i++] + off;
1194                 else
1195                     idx = ff_vc1_adv_interlaced_8x4_zz[i++] + off;
1196                 block[idx] = value * scale;
1197                 if (!v->pquantizer)
1198                     block[idx] += (block[idx] < 0) ? -mquant : mquant;
1199             }
1200             if (!(subblkpat & (1 << (1 - j))) && !skip_block) {
1201                 if (i == 1)
1202                     v->vc1dsp.vc1_inv_trans_8x4_dc(dst + j * 4 * linesize, linesize, block + off);
1203                 else
1204                     v->vc1dsp.vc1_inv_trans_8x4(dst + j * 4 * linesize, linesize, block + off);
1205             }
1206         }
1207         break;
1208     case TT_4X8:
1209         pat = ~(subblkpat * 5) & 0xF;
1210         for (j = 0; j < 2; j++) {
1211             last = subblkpat & (1 << (1 - j));
1212             i    = 0;
1213             off  = j * 4;
1214             while (!last) {
1215                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);
1216                 i += skip;
1217                 if (i > 31)
1218                     break;
1219                 if (!v->fcm)
1220                     idx = v->zz_4x8[i++] + off;
1221                 else
1222                     idx = ff_vc1_adv_interlaced_4x8_zz[i++] + off;
1223                 block[idx] = value * scale;
1224                 if (!v->pquantizer)
1225                     block[idx] += (block[idx] < 0) ? -mquant : mquant;
1226             }
1227             if (!(subblkpat & (1 << (1 - j))) && !skip_block) {
1228                 if (i == 1)
1229                     v->vc1dsp.vc1_inv_trans_4x8_dc(dst + j * 4, linesize, block + off);
1230                 else
1231                     v->vc1dsp.vc1_inv_trans_4x8(dst + j*4, linesize, block + off);
1232             }
1233         }
1234         break;
1235     }
1236     if (ttmb_out)
1237         *ttmb_out |= ttblk << (n * 4);
1238     return pat;
1239 }
1240
1241 /** @} */ // Macroblock group
1242
1243 static const uint8_t size_table[6] = { 0, 2, 3, 4,  5,  8 };
1244
1245 /** Decode one P-frame MB
1246  */
1247 static int vc1_decode_p_mb(VC1Context *v)
1248 {
1249     MpegEncContext *s = &v->s;
1250     GetBitContext *gb = &s->gb;
1251     int i, j;
1252     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
1253     int cbp; /* cbp decoding stuff */
1254     int mqdiff, mquant; /* MB quantization */
1255     int ttmb = v->ttfrm; /* MB Transform type */
1256
1257     int mb_has_coeffs = 1; /* last_flag */
1258     int dmv_x, dmv_y; /* Differential MV components */
1259     int index, index1; /* LUT indexes */
1260     int val, sign; /* temp values */
1261     int first_block = 1;
1262     int dst_idx, off;
1263     int skipped, fourmv;
1264     int block_cbp = 0, pat, block_tt = 0, block_intra = 0;
1265
1266     mquant = v->pq; /* lossy initialization */
1267
1268     if (v->mv_type_is_raw)
1269         fourmv = get_bits1(gb);
1270     else
1271         fourmv = v->mv_type_mb_plane[mb_pos];
1272     if (v->skip_is_raw)
1273         skipped = get_bits1(gb);
1274     else
1275         skipped = v->s.mbskip_table[mb_pos];
1276
1277     if (!fourmv) { /* 1MV mode */
1278         if (!skipped) {
1279             GET_MVDATA(dmv_x, dmv_y);
1280
1281             if (s->mb_intra) {
1282                 s->current_picture.motion_val[1][s->block_index[0]][0] = 0;
1283                 s->current_picture.motion_val[1][s->block_index[0]][1] = 0;
1284             }
1285             s->current_picture.mb_type[mb_pos] = s->mb_intra ? MB_TYPE_INTRA : MB_TYPE_16x16;
1286             ff_vc1_pred_mv(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], 0, 0);
1287
1288             /* FIXME Set DC val for inter block ? */
1289             if (s->mb_intra && !mb_has_coeffs) {
1290                 GET_MQUANT();
1291                 s->ac_pred = get_bits1(gb);
1292                 cbp        = 0;
1293             } else if (mb_has_coeffs) {
1294                 if (s->mb_intra)
1295                     s->ac_pred = get_bits1(gb);
1296                 cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);
1297                 GET_MQUANT();
1298             } else {
1299                 mquant = v->pq;
1300                 cbp    = 0;
1301             }
1302             s->current_picture.qscale_table[mb_pos] = mquant;
1303
1304             if (!v->ttmbf && !s->mb_intra && mb_has_coeffs)
1305                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table,
1306                                 VC1_TTMB_VLC_BITS, 2);
1307             if (!s->mb_intra) ff_vc1_mc_1mv(v, 0);
1308             dst_idx = 0;
1309             for (i = 0; i < 6; i++) {
1310                 s->dc_val[0][s->block_index[i]] = 0;
1311                 dst_idx += i >> 2;
1312                 val = ((cbp >> (5 - i)) & 1);
1313                 off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);
1314                 v->mb_type[0][s->block_index[i]] = s->mb_intra;
1315                 if (s->mb_intra) {
1316                     /* check if prediction blocks A and C are available */
1317                     v->a_avail = v->c_avail = 0;
1318                     if (i == 2 || i == 3 || !s->first_slice_line)
1319                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];
1320                     if (i == 1 || i == 3 || s->mb_x)
1321                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];
1322
1323                     vc1_decode_intra_block(v, v->block[v->cur_blk_idx][i], i, val, mquant,
1324                                            (i & 4) ? v->codingset2 : v->codingset);
1325                     if (CONFIG_GRAY && (i > 3) && (s->avctx->flags & AV_CODEC_FLAG_GRAY))
1326                         continue;
1327                     v->vc1dsp.vc1_inv_trans_8x8(v->block[v->cur_blk_idx][i]);
1328                     if (v->rangeredfrm)
1329                         for (j = 0; j < 64; j++)
1330                             v->block[v->cur_blk_idx][i][j] <<= 1;
1331                     block_cbp   |= 0xF << (i << 2);
1332                     block_intra |= 1 << i;
1333                 } else if (val) {
1334                     pat = vc1_decode_p_block(v, v->block[v->cur_blk_idx][i], i, mquant, ttmb, first_block,
1335                                              s->dest[dst_idx] + off, (i & 4) ? s->uvlinesize : s->linesize,
1336                                              CONFIG_GRAY && (i & 4) && (s->avctx->flags & AV_CODEC_FLAG_GRAY), &block_tt);
1337                     block_cbp |= pat << (i << 2);
1338                     if (!v->ttmbf && ttmb < 8)
1339                         ttmb = -1;
1340                     first_block = 0;
1341                 }
1342             }
1343         } else { // skipped
1344             s->mb_intra = 0;
1345             for (i = 0; i < 6; i++) {
1346                 v->mb_type[0][s->block_index[i]] = 0;
1347                 s->dc_val[0][s->block_index[i]]  = 0;
1348             }
1349             s->current_picture.mb_type[mb_pos]      = MB_TYPE_SKIP;
1350             s->current_picture.qscale_table[mb_pos] = 0;
1351             ff_vc1_pred_mv(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0], 0, 0);
1352             ff_vc1_mc_1mv(v, 0);
1353         }
1354     } else { // 4MV mode
1355         if (!skipped /* unskipped MB */) {
1356             int intra_count = 0, coded_inter = 0;
1357             int is_intra[6], is_coded[6];
1358             /* Get CBPCY */
1359             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);
1360             for (i = 0; i < 6; i++) {
1361                 val = ((cbp >> (5 - i)) & 1);
1362                 s->dc_val[0][s->block_index[i]] = 0;
1363                 s->mb_intra                     = 0;
1364                 if (i < 4) {
1365                     dmv_x = dmv_y = 0;
1366                     s->mb_intra   = 0;
1367                     mb_has_coeffs = 0;
1368                     if (val) {
1369                         GET_MVDATA(dmv_x, dmv_y);
1370                     }
1371                     ff_vc1_pred_mv(v, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0], 0, 0);
1372                     if (!s->mb_intra)
1373                         ff_vc1_mc_4mv_luma(v, i, 0, 0);
1374                     intra_count += s->mb_intra;
1375                     is_intra[i]  = s->mb_intra;
1376                     is_coded[i]  = mb_has_coeffs;
1377                 }
1378                 if (i & 4) {
1379                     is_intra[i] = (intra_count >= 3);
1380                     is_coded[i] = val;
1381                 }
1382                 if (i == 4)
1383                     ff_vc1_mc_4mv_chroma(v, 0);
1384                 v->mb_type[0][s->block_index[i]] = is_intra[i];
1385                 if (!coded_inter)
1386                     coded_inter = !is_intra[i] & is_coded[i];
1387             }
1388             // if there are no coded blocks then don't do anything more
1389             dst_idx = 0;
1390             if (!intra_count && !coded_inter)
1391                 goto end;
1392             GET_MQUANT();
1393             s->current_picture.qscale_table[mb_pos] = mquant;
1394             /* test if block is intra and has pred */
1395             {
1396                 int intrapred = 0;
1397                 for (i = 0; i < 6; i++)
1398                     if (is_intra[i]) {
1399                         if (((!s->first_slice_line || (i == 2 || i == 3)) && v->mb_type[0][s->block_index[i] - s->block_wrap[i]])
1400                             || ((s->mb_x || (i == 1 || i == 3)) && v->mb_type[0][s->block_index[i] - 1])) {
1401                             intrapred = 1;
1402                             break;
1403                         }
1404                     }
1405                 if (intrapred)
1406                     s->ac_pred = get_bits1(gb);
1407                 else
1408                     s->ac_pred = 0;
1409             }
1410             if (!v->ttmbf && coded_inter)
1411                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);
1412             for (i = 0; i < 6; i++) {
1413                 dst_idx    += i >> 2;
1414                 off         = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);
1415                 s->mb_intra = is_intra[i];
1416                 if (is_intra[i]) {
1417                     /* check if prediction blocks A and C are available */
1418                     v->a_avail = v->c_avail = 0;
1419                     if (i == 2 || i == 3 || !s->first_slice_line)
1420                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];
1421                     if (i == 1 || i == 3 || s->mb_x)
1422                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];
1423
1424                     vc1_decode_intra_block(v, v->block[v->cur_blk_idx][i], i, is_coded[i], mquant,
1425                                            (i & 4) ? v->codingset2 : v->codingset);
1426                     if (CONFIG_GRAY && (i > 3) && (s->avctx->flags & AV_CODEC_FLAG_GRAY))
1427                         continue;
1428                     v->vc1dsp.vc1_inv_trans_8x8(v->block[v->cur_blk_idx][i]);
1429                     if (v->rangeredfrm)
1430                         for (j = 0; j < 64; j++)
1431                             v->block[v->cur_blk_idx][i][j] <<= 1;
1432                     block_cbp   |= 0xF << (i << 2);
1433                     block_intra |= 1 << i;
1434                 } else if (is_coded[i]) {
1435                     pat = vc1_decode_p_block(v, v->block[v->cur_blk_idx][i], i, mquant, ttmb,
1436                                              first_block, s->dest[dst_idx] + off,
1437                                              (i & 4) ? s->uvlinesize : s->linesize,
1438                                              CONFIG_GRAY && (i & 4) && (s->avctx->flags & AV_CODEC_FLAG_GRAY),
1439                                              &block_tt);
1440                     block_cbp |= pat << (i << 2);
1441                     if (!v->ttmbf && ttmb < 8)
1442                         ttmb = -1;
1443                     first_block = 0;
1444                 }
1445             }
1446         } else { // skipped MB
1447             s->mb_intra                               = 0;
1448             s->current_picture.qscale_table[mb_pos] = 0;
1449             for (i = 0; i < 6; i++) {
1450                 v->mb_type[0][s->block_index[i]] = 0;
1451                 s->dc_val[0][s->block_index[i]]  = 0;
1452             }
1453             for (i = 0; i < 4; i++) {
1454                 ff_vc1_pred_mv(v, i, 0, 0, 0, v->range_x, v->range_y, v->mb_type[0], 0, 0);
1455                 ff_vc1_mc_4mv_luma(v, i, 0, 0);
1456             }
1457             ff_vc1_mc_4mv_chroma(v, 0);
1458             s->current_picture.qscale_table[mb_pos] = 0;
1459         }
1460     }
1461 end:
1462     if (v->overlap && v->pq >= 9)
1463         ff_vc1_p_overlap_filter(v);
1464     vc1_put_signed_blocks_clamped(v);
1465
1466     v->cbp[s->mb_x]      = block_cbp;
1467     v->ttblk[s->mb_x]    = block_tt;
1468     v->is_intra[s->mb_x] = block_intra;
1469
1470     return 0;
1471 }
1472
1473 /* Decode one macroblock in an interlaced frame p picture */
1474
1475 static int vc1_decode_p_mb_intfr(VC1Context *v)
1476 {
1477     MpegEncContext *s = &v->s;
1478     GetBitContext *gb = &s->gb;
1479     int i;
1480     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
1481     int cbp = 0; /* cbp decoding stuff */
1482     int mqdiff, mquant; /* MB quantization */
1483     int ttmb = v->ttfrm; /* MB Transform type */
1484
1485     int mb_has_coeffs = 1; /* last_flag */
1486     int dmv_x, dmv_y; /* Differential MV components */
1487     int val; /* temp value */
1488     int first_block = 1;
1489     int dst_idx, off;
1490     int skipped, fourmv = 0, twomv = 0;
1491     int block_cbp = 0, pat, block_tt = 0;
1492     int idx_mbmode = 0, mvbp;
1493     int fieldtx;
1494
1495     mquant = v->pq; /* Lossy initialization */
1496
1497     if (v->skip_is_raw)
1498         skipped = get_bits1(gb);
1499     else
1500         skipped = v->s.mbskip_table[mb_pos];
1501     if (!skipped) {
1502         if (v->fourmvswitch)
1503             idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_INTFR_4MV_MBMODE_VLC_BITS, 2); // try getting this done
1504         else
1505             idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_INTFR_NON4MV_MBMODE_VLC_BITS, 2); // in a single line
1506         switch (ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0]) {
1507         /* store the motion vector type in a flag (useful later) */
1508         case MV_PMODE_INTFR_4MV:
1509             fourmv = 1;
1510             v->blk_mv_type[s->block_index[0]] = 0;
1511             v->blk_mv_type[s->block_index[1]] = 0;
1512             v->blk_mv_type[s->block_index[2]] = 0;
1513             v->blk_mv_type[s->block_index[3]] = 0;
1514             break;
1515         case MV_PMODE_INTFR_4MV_FIELD:
1516             fourmv = 1;
1517             v->blk_mv_type[s->block_index[0]] = 1;
1518             v->blk_mv_type[s->block_index[1]] = 1;
1519             v->blk_mv_type[s->block_index[2]] = 1;
1520             v->blk_mv_type[s->block_index[3]] = 1;
1521             break;
1522         case MV_PMODE_INTFR_2MV_FIELD:
1523             twomv = 1;
1524             v->blk_mv_type[s->block_index[0]] = 1;
1525             v->blk_mv_type[s->block_index[1]] = 1;
1526             v->blk_mv_type[s->block_index[2]] = 1;
1527             v->blk_mv_type[s->block_index[3]] = 1;
1528             break;
1529         case MV_PMODE_INTFR_1MV:
1530             v->blk_mv_type[s->block_index[0]] = 0;
1531             v->blk_mv_type[s->block_index[1]] = 0;
1532             v->blk_mv_type[s->block_index[2]] = 0;
1533             v->blk_mv_type[s->block_index[3]] = 0;
1534             break;
1535         }
1536         if (ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0] == MV_PMODE_INTFR_INTRA) { // intra MB
1537             for (i = 0; i < 4; i++) {
1538                 s->current_picture.motion_val[1][s->block_index[i]][0] = 0;
1539                 s->current_picture.motion_val[1][s->block_index[i]][1] = 0;
1540             }
1541             v->is_intra[s->mb_x] = 0x3f; // Set the bitfield to all 1.
1542             s->mb_intra          = 1;
1543             s->current_picture.mb_type[mb_pos] = MB_TYPE_INTRA;
1544             fieldtx = v->fieldtx_plane[mb_pos] = get_bits1(gb);
1545             mb_has_coeffs = get_bits1(gb);
1546             if (mb_has_coeffs)
1547                 cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);
1548             v->s.ac_pred = v->acpred_plane[mb_pos] = get_bits1(gb);
1549             GET_MQUANT();
1550             s->current_picture.qscale_table[mb_pos] = mquant;
1551             /* Set DC scale - y and c use the same (not sure if necessary here) */
1552             s->y_dc_scale = s->y_dc_scale_table[mquant];
1553             s->c_dc_scale = s->c_dc_scale_table[mquant];
1554             dst_idx = 0;
1555             for (i = 0; i < 6; i++) {
1556                 v->a_avail = v->c_avail          = 0;
1557                 v->mb_type[0][s->block_index[i]] = 1;
1558                 s->dc_val[0][s->block_index[i]]  = 0;
1559                 dst_idx += i >> 2;
1560                 val = ((cbp >> (5 - i)) & 1);
1561                 if (i == 2 || i == 3 || !s->first_slice_line)
1562                     v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];
1563                 if (i == 1 || i == 3 || s->mb_x)
1564                     v->c_avail = v->mb_type[0][s->block_index[i] - 1];
1565
1566                 vc1_decode_intra_block(v, v->block[v->cur_blk_idx][i], i, val, mquant,
1567                                        (i & 4) ? v->codingset2 : v->codingset);
1568                 if (CONFIG_GRAY && (i > 3) && (s->avctx->flags & AV_CODEC_FLAG_GRAY))
1569                     continue;
1570                 v->vc1dsp.vc1_inv_trans_8x8(v->block[v->cur_blk_idx][i]);
1571                 if (i < 4)
1572                     off = (fieldtx) ? ((i & 1) * 8) + ((i & 2) >> 1) * s->linesize : (i & 1) * 8 + 4 * (i & 2) * s->linesize;
1573                 else
1574                     off = 0;
1575                 block_cbp |= 0xf << (i << 2);
1576             }
1577
1578         } else { // inter MB
1579             mb_has_coeffs = ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][3];
1580             if (mb_has_coeffs)
1581                 cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);
1582             if (ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0] == MV_PMODE_INTFR_2MV_FIELD) {
1583                 v->twomvbp = get_vlc2(gb, v->twomvbp_vlc->table, VC1_2MV_BLOCK_PATTERN_VLC_BITS, 1);
1584             } else {
1585                 if ((ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0] == MV_PMODE_INTFR_4MV)
1586                     || (ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0] == MV_PMODE_INTFR_4MV_FIELD)) {
1587                     v->fourmvbp = get_vlc2(gb, v->fourmvbp_vlc->table, VC1_4MV_BLOCK_PATTERN_VLC_BITS, 1);
1588                 }
1589             }
1590             s->mb_intra = v->is_intra[s->mb_x] = 0;
1591             for (i = 0; i < 6; i++)
1592                 v->mb_type[0][s->block_index[i]] = 0;
1593             fieldtx = v->fieldtx_plane[mb_pos] = ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][1];
1594             /* for all motion vector read MVDATA and motion compensate each block */
1595             dst_idx = 0;
1596             if (fourmv) {
1597                 mvbp = v->fourmvbp;
1598                 for (i = 0; i < 4; i++) {
1599                     dmv_x = dmv_y = 0;
1600                     if (mvbp & (8 >> i))
1601                         get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);
1602                     ff_vc1_pred_mv_intfr(v, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0], 0);
1603                     ff_vc1_mc_4mv_luma(v, i, 0, 0);
1604                 }
1605                 ff_vc1_mc_4mv_chroma4(v, 0, 0, 0);
1606             } else if (twomv) {
1607                 mvbp  = v->twomvbp;
1608                 dmv_x = dmv_y = 0;
1609                 if (mvbp & 2) {
1610                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);
1611                 }
1612                 ff_vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0], 0);
1613                 ff_vc1_mc_4mv_luma(v, 0, 0, 0);
1614                 ff_vc1_mc_4mv_luma(v, 1, 0, 0);
1615                 dmv_x = dmv_y = 0;
1616                 if (mvbp & 1) {
1617                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);
1618                 }
1619                 ff_vc1_pred_mv_intfr(v, 2, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0], 0);
1620                 ff_vc1_mc_4mv_luma(v, 2, 0, 0);
1621                 ff_vc1_mc_4mv_luma(v, 3, 0, 0);
1622                 ff_vc1_mc_4mv_chroma4(v, 0, 0, 0);
1623             } else {
1624                 mvbp = ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][2];
1625                 dmv_x = dmv_y = 0;
1626                 if (mvbp) {
1627                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);
1628                 }
1629                 ff_vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], 0);
1630                 ff_vc1_mc_1mv(v, 0);
1631             }
1632             if (cbp)
1633                 GET_MQUANT();  // p. 227
1634             s->current_picture.qscale_table[mb_pos] = mquant;
1635             if (!v->ttmbf && cbp)
1636                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);
1637             for (i = 0; i < 6; i++) {
1638                 s->dc_val[0][s->block_index[i]] = 0;
1639                 dst_idx += i >> 2;
1640                 val = ((cbp >> (5 - i)) & 1);
1641                 if (!fieldtx)
1642                     off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);
1643                 else
1644                     off = (i & 4) ? 0 : ((i & 1) * 8 + ((i > 1) * s->linesize));
1645                 if (val) {
1646                     pat = vc1_decode_p_block(v, v->block[v->cur_blk_idx][i], i, mquant, ttmb,
1647                                              first_block, s->dest[dst_idx] + off,
1648                                              (i & 4) ? s->uvlinesize : (s->linesize << fieldtx),
1649                                              CONFIG_GRAY && (i & 4) && (s->avctx->flags & AV_CODEC_FLAG_GRAY), &block_tt);
1650                     block_cbp |= pat << (i << 2);
1651                     if (!v->ttmbf && ttmb < 8)
1652                         ttmb = -1;
1653                     first_block = 0;
1654                 }
1655             }
1656         }
1657     } else { // skipped
1658         s->mb_intra = v->is_intra[s->mb_x] = 0;
1659         for (i = 0; i < 6; i++) {
1660             v->mb_type[0][s->block_index[i]] = 0;
1661             s->dc_val[0][s->block_index[i]] = 0;
1662         }
1663         s->current_picture.mb_type[mb_pos]      = MB_TYPE_SKIP;
1664         s->current_picture.qscale_table[mb_pos] = 0;
1665         v->blk_mv_type[s->block_index[0]] = 0;
1666         v->blk_mv_type[s->block_index[1]] = 0;
1667         v->blk_mv_type[s->block_index[2]] = 0;
1668         v->blk_mv_type[s->block_index[3]] = 0;
1669         ff_vc1_pred_mv_intfr(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0], 0);
1670         ff_vc1_mc_1mv(v, 0);
1671         v->fieldtx_plane[mb_pos] = 0;
1672     }
1673     if (v->overlap && v->pq >= 9)
1674         ff_vc1_p_overlap_filter(v);
1675     vc1_put_signed_blocks_clamped(v);
1676
1677     v->cbp[s->mb_x]      = block_cbp;
1678     v->ttblk[s->mb_x]    = block_tt;
1679
1680     return 0;
1681 }
1682
1683 static int vc1_decode_p_mb_intfi(VC1Context *v)
1684 {
1685     MpegEncContext *s = &v->s;
1686     GetBitContext *gb = &s->gb;
1687     int i;
1688     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
1689     int cbp = 0; /* cbp decoding stuff */
1690     int mqdiff, mquant; /* MB quantization */
1691     int ttmb = v->ttfrm; /* MB Transform type */
1692
1693     int mb_has_coeffs = 1; /* last_flag */
1694     int dmv_x, dmv_y; /* Differential MV components */
1695     int val; /* temp values */
1696     int first_block = 1;
1697     int dst_idx, off;
1698     int pred_flag = 0;
1699     int block_cbp = 0, pat, block_tt = 0;
1700     int idx_mbmode = 0;
1701
1702     mquant = v->pq; /* Lossy initialization */
1703
1704     idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_IF_MBMODE_VLC_BITS, 2);
1705     if (idx_mbmode <= 1) { // intra MB
1706         v->is_intra[s->mb_x] = 0x3f; // Set the bitfield to all 1.
1707         s->mb_intra          = 1;
1708         s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][0] = 0;
1709         s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][1] = 0;
1710         s->current_picture.mb_type[mb_pos + v->mb_off] = MB_TYPE_INTRA;
1711         GET_MQUANT();
1712         s->current_picture.qscale_table[mb_pos] = mquant;
1713         /* Set DC scale - y and c use the same (not sure if necessary here) */
1714         s->y_dc_scale = s->y_dc_scale_table[mquant];
1715         s->c_dc_scale = s->c_dc_scale_table[mquant];
1716         v->s.ac_pred  = v->acpred_plane[mb_pos] = get_bits1(gb);
1717         mb_has_coeffs = idx_mbmode & 1;
1718         if (mb_has_coeffs)
1719             cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_ICBPCY_VLC_BITS, 2);
1720         dst_idx = 0;
1721         for (i = 0; i < 6; i++) {
1722             v->a_avail = v->c_avail          = 0;
1723             v->mb_type[0][s->block_index[i]] = 1;
1724             s->dc_val[0][s->block_index[i]]  = 0;
1725             dst_idx += i >> 2;
1726             val = ((cbp >> (5 - i)) & 1);
1727             if (i == 2 || i == 3 || !s->first_slice_line)
1728                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];
1729             if (i == 1 || i == 3 || s->mb_x)
1730                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];
1731
1732             vc1_decode_intra_block(v, v->block[v->cur_blk_idx][i], i, val, mquant,
1733                                    (i & 4) ? v->codingset2 : v->codingset);
1734             if (CONFIG_GRAY && (i > 3) && (s->avctx->flags & AV_CODEC_FLAG_GRAY))
1735                 continue;
1736             v->vc1dsp.vc1_inv_trans_8x8(v->block[v->cur_blk_idx][i]);
1737             off  = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);
1738             block_cbp |= 0xf << (i << 2);
1739         }
1740     } else {
1741         s->mb_intra = v->is_intra[s->mb_x] = 0;
1742         s->current_picture.mb_type[mb_pos + v->mb_off] = MB_TYPE_16x16;
1743         for (i = 0; i < 6; i++)
1744             v->mb_type[0][s->block_index[i]] = 0;
1745         if (idx_mbmode <= 5) { // 1-MV
1746             dmv_x = dmv_y = pred_flag = 0;
1747             if (idx_mbmode & 1) {
1748                 get_mvdata_interlaced(v, &dmv_x, &dmv_y, &pred_flag);
1749             }
1750             ff_vc1_pred_mv(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], pred_flag, 0);
1751             ff_vc1_mc_1mv(v, 0);
1752             mb_has_coeffs = !(idx_mbmode & 2);
1753         } else { // 4-MV
1754             v->fourmvbp = get_vlc2(gb, v->fourmvbp_vlc->table, VC1_4MV_BLOCK_PATTERN_VLC_BITS, 1);
1755             for (i = 0; i < 4; i++) {
1756                 dmv_x = dmv_y = pred_flag = 0;
1757                 if (v->fourmvbp & (8 >> i))
1758                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, &pred_flag);
1759                 ff_vc1_pred_mv(v, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0], pred_flag, 0);
1760                 ff_vc1_mc_4mv_luma(v, i, 0, 0);
1761             }
1762             ff_vc1_mc_4mv_chroma(v, 0);
1763             mb_has_coeffs = idx_mbmode & 1;
1764         }
1765         if (mb_has_coeffs)
1766             cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);
1767         if (cbp) {
1768             GET_MQUANT();
1769         }
1770         s->current_picture.qscale_table[mb_pos] = mquant;
1771         if (!v->ttmbf && cbp) {
1772             ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);
1773         }
1774         dst_idx = 0;
1775         for (i = 0; i < 6; i++) {
1776             s->dc_val[0][s->block_index[i]] = 0;
1777             dst_idx += i >> 2;
1778             val = ((cbp >> (5 - i)) & 1);
1779             off = (i & 4) ? 0 : (i & 1) * 8 + (i & 2) * 4 * s->linesize;
1780             if (val) {
1781                 pat = vc1_decode_p_block(v, v->block[v->cur_blk_idx][i], i, mquant, ttmb,
1782                                          first_block, s->dest[dst_idx] + off,
1783                                          (i & 4) ? s->uvlinesize : s->linesize,
1784                                          CONFIG_GRAY && (i & 4) && (s->avctx->flags & AV_CODEC_FLAG_GRAY),
1785                                          &block_tt);
1786                 block_cbp |= pat << (i << 2);
1787                 if (!v->ttmbf && ttmb < 8)
1788                     ttmb = -1;
1789                 first_block = 0;
1790             }
1791         }
1792     }
1793     if (v->overlap && v->pq >= 9)
1794         ff_vc1_p_overlap_filter(v);
1795     vc1_put_signed_blocks_clamped(v);
1796
1797     v->cbp[s->mb_x]      = block_cbp;
1798     v->ttblk[s->mb_x]    = block_tt;
1799
1800     return 0;
1801 }
1802
1803 /** Decode one B-frame MB (in Main profile)
1804  */
1805 static void vc1_decode_b_mb(VC1Context *v)
1806 {
1807     MpegEncContext *s = &v->s;
1808     GetBitContext *gb = &s->gb;
1809     int i, j;
1810     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
1811     int cbp = 0; /* cbp decoding stuff */
1812     int mqdiff, mquant; /* MB quantization */
1813     int ttmb = v->ttfrm; /* MB Transform type */
1814     int mb_has_coeffs = 0; /* last_flag */
1815     int index, index1; /* LUT indexes */
1816     int val, sign; /* temp values */
1817     int first_block = 1;
1818     int dst_idx, off;
1819     int skipped, direct;
1820     int dmv_x[2], dmv_y[2];
1821     int bmvtype = BMV_TYPE_BACKWARD;
1822
1823     mquant      = v->pq; /* lossy initialization */
1824     s->mb_intra = 0;
1825
1826     if (v->dmb_is_raw)
1827         direct = get_bits1(gb);
1828     else
1829         direct = v->direct_mb_plane[mb_pos];
1830     if (v->skip_is_raw)
1831         skipped = get_bits1(gb);
1832     else
1833         skipped = v->s.mbskip_table[mb_pos];
1834
1835     dmv_x[0] = dmv_x[1] = dmv_y[0] = dmv_y[1] = 0;
1836     for (i = 0; i < 6; i++) {
1837         v->mb_type[0][s->block_index[i]] = 0;
1838         s->dc_val[0][s->block_index[i]]  = 0;
1839     }
1840     s->current_picture.qscale_table[mb_pos] = 0;
1841
1842     if (!direct) {
1843         if (!skipped) {
1844             GET_MVDATA(dmv_x[0], dmv_y[0]);
1845             dmv_x[1] = dmv_x[0];
1846             dmv_y[1] = dmv_y[0];
1847         }
1848         if (skipped || !s->mb_intra) {
1849             bmvtype = decode012(gb);
1850             switch (bmvtype) {
1851             case 0:
1852                 bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_BACKWARD : BMV_TYPE_FORWARD;
1853                 break;
1854             case 1:
1855                 bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_FORWARD : BMV_TYPE_BACKWARD;
1856                 break;
1857             case 2:
1858                 bmvtype  = BMV_TYPE_INTERPOLATED;
1859                 dmv_x[0] = dmv_y[0] = 0;
1860             }
1861         }
1862     }
1863     for (i = 0; i < 6; i++)
1864         v->mb_type[0][s->block_index[i]] = s->mb_intra;
1865
1866     if (skipped) {
1867         if (direct)
1868             bmvtype = BMV_TYPE_INTERPOLATED;
1869         ff_vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);
1870         vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);
1871         return;
1872     }
1873     if (direct) {
1874         cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);
1875         GET_MQUANT();
1876         s->mb_intra = 0;
1877         s->current_picture.qscale_table[mb_pos] = mquant;
1878         if (!v->ttmbf)
1879             ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);
1880         dmv_x[0] = dmv_y[0] = dmv_x[1] = dmv_y[1] = 0;
1881         ff_vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);
1882         vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);
1883     } else {
1884         if (!mb_has_coeffs && !s->mb_intra) {
1885             /* no coded blocks - effectively skipped */
1886             ff_vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);
1887             vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);
1888             return;
1889         }
1890         if (s->mb_intra && !mb_has_coeffs) {
1891             GET_MQUANT();
1892             s->current_picture.qscale_table[mb_pos] = mquant;
1893             s->ac_pred = get_bits1(gb);
1894             cbp = 0;
1895             ff_vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);
1896         } else {
1897             if (bmvtype == BMV_TYPE_INTERPOLATED) {
1898                 GET_MVDATA(dmv_x[0], dmv_y[0]);
1899                 if (!mb_has_coeffs) {
1900                     /* interpolated skipped block */
1901                     ff_vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);
1902                     vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);
1903                     return;
1904                 }
1905             }
1906             ff_vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);
1907             if (!s->mb_intra) {
1908                 vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);
1909             }
1910             if (s->mb_intra)
1911                 s->ac_pred = get_bits1(gb);
1912             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);
1913             GET_MQUANT();
1914             s->current_picture.qscale_table[mb_pos] = mquant;
1915             if (!v->ttmbf && !s->mb_intra && mb_has_coeffs)
1916                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);
1917         }
1918     }
1919     dst_idx = 0;
1920     for (i = 0; i < 6; i++) {
1921         s->dc_val[0][s->block_index[i]] = 0;
1922         dst_idx += i >> 2;
1923         val = ((cbp >> (5 - i)) & 1);
1924         off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);
1925         v->mb_type[0][s->block_index[i]] = s->mb_intra;
1926         if (s->mb_intra) {
1927             /* check if prediction blocks A and C are available */
1928             v->a_avail = v->c_avail = 0;
1929             if (i == 2 || i == 3 || !s->first_slice_line)
1930                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];
1931             if (i == 1 || i == 3 || s->mb_x)
1932                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];
1933
1934             vc1_decode_intra_block(v, s->block[i], i, val, mquant,
1935                                    (i & 4) ? v->codingset2 : v->codingset);
1936             if (CONFIG_GRAY && (i > 3) && (s->avctx->flags & AV_CODEC_FLAG_GRAY))
1937                 continue;
1938             v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);
1939             if (v->rangeredfrm)
1940                 for (j = 0; j < 64; j++)
1941                     s->block[i][j] <<= 1;
1942             s->idsp.put_signed_pixels_clamped(s->block[i],
1943                                               s->dest[dst_idx] + off,
1944                                               i & 4 ? s->uvlinesize
1945                                                     : s->linesize);
1946         } else if (val) {
1947             vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,
1948                                first_block, s->dest[dst_idx] + off,
1949                                (i & 4) ? s->uvlinesize : s->linesize,
1950                                CONFIG_GRAY && (i & 4) && (s->avctx->flags & AV_CODEC_FLAG_GRAY), NULL);
1951             if (!v->ttmbf && ttmb < 8)
1952                 ttmb = -1;
1953             first_block = 0;
1954         }
1955     }
1956 }
1957
1958 /** Decode one B-frame MB (in interlaced field B picture)
1959  */
1960 static void vc1_decode_b_mb_intfi(VC1Context *v)
1961 {
1962     MpegEncContext *s = &v->s;
1963     GetBitContext *gb = &s->gb;
1964     int i, j;
1965     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
1966     int cbp = 0; /* cbp decoding stuff */
1967     int mqdiff, mquant; /* MB quantization */
1968     int ttmb = v->ttfrm; /* MB Transform type */
1969     int mb_has_coeffs = 0; /* last_flag */
1970     int val; /* temp value */
1971     int first_block = 1;
1972     int dst_idx, off;
1973     int fwd;
1974     int dmv_x[2], dmv_y[2], pred_flag[2];
1975     int bmvtype = BMV_TYPE_BACKWARD;
1976     int block_cbp = 0, pat, block_tt = 0;
1977     int idx_mbmode;
1978
1979     mquant      = v->pq; /* Lossy initialization */
1980     s->mb_intra = 0;
1981
1982     idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_IF_MBMODE_VLC_BITS, 2);
1983     if (idx_mbmode <= 1) { // intra MB
1984         v->is_intra[s->mb_x] = 0x3f; // Set the bitfield to all 1.
1985         s->mb_intra          = 1;
1986         s->current_picture.motion_val[1][s->block_index[0]][0] = 0;
1987         s->current_picture.motion_val[1][s->block_index[0]][1] = 0;
1988         s->current_picture.mb_type[mb_pos + v->mb_off]         = MB_TYPE_INTRA;
1989         GET_MQUANT();
1990         s->current_picture.qscale_table[mb_pos] = mquant;
1991         /* Set DC scale - y and c use the same (not sure if necessary here) */
1992         s->y_dc_scale = s->y_dc_scale_table[mquant];
1993         s->c_dc_scale = s->c_dc_scale_table[mquant];
1994         v->s.ac_pred  = v->acpred_plane[mb_pos] = get_bits1(gb);
1995         mb_has_coeffs = idx_mbmode & 1;
1996         if (mb_has_coeffs)
1997             cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_ICBPCY_VLC_BITS, 2);
1998         dst_idx = 0;
1999         for (i = 0; i < 6; i++) {
2000             v->a_avail = v->c_avail          = 0;
2001             v->mb_type[0][s->block_index[i]] = 1;
2002             s->dc_val[0][s->block_index[i]]  = 0;
2003             dst_idx += i >> 2;
2004             val = ((cbp >> (5 - i)) & 1);
2005             if (i == 2 || i == 3 || !s->first_slice_line)
2006                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];
2007             if (i == 1 || i == 3 || s->mb_x)
2008                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];
2009
2010             vc1_decode_intra_block(v, s->block[i], i, val, mquant,
2011                                    (i & 4) ? v->codingset2 : v->codingset);
2012             if (CONFIG_GRAY && (i > 3) && (s->avctx->flags & AV_CODEC_FLAG_GRAY))
2013                 continue;
2014             v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);
2015             if (v->rangeredfrm)
2016                 for (j = 0; j < 64; j++)
2017                     s->block[i][j] <<= 1;
2018             off  = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);
2019             s->idsp.put_signed_pixels_clamped(s->block[i],
2020                                               s->dest[dst_idx] + off,
2021                                               (i & 4) ? s->uvlinesize
2022                                                       : s->linesize);
2023         }
2024     } else {
2025         s->mb_intra = v->is_intra[s->mb_x] = 0;
2026         s->current_picture.mb_type[mb_pos + v->mb_off] = MB_TYPE_16x16;
2027         for (i = 0; i < 6; i++)
2028             v->mb_type[0][s->block_index[i]] = 0;
2029         if (v->fmb_is_raw)
2030             fwd = v->forward_mb_plane[mb_pos] = get_bits1(gb);
2031         else
2032             fwd = v->forward_mb_plane[mb_pos];
2033         if (idx_mbmode <= 5) { // 1-MV
2034             int interpmvp = 0;
2035             dmv_x[0]     = dmv_x[1] = dmv_y[0] = dmv_y[1] = 0;
2036             pred_flag[0] = pred_flag[1] = 0;
2037             if (fwd)
2038                 bmvtype = BMV_TYPE_FORWARD;
2039             else {
2040                 bmvtype = decode012(gb);
2041                 switch (bmvtype) {
2042                 case 0:
2043                     bmvtype = BMV_TYPE_BACKWARD;
2044                     break;
2045                 case 1:
2046                     bmvtype = BMV_TYPE_DIRECT;
2047                     break;
2048                 case 2:
2049                     bmvtype   = BMV_TYPE_INTERPOLATED;
2050                     interpmvp = get_bits1(gb);
2051                 }
2052             }
2053             v->bmvtype = bmvtype;
2054             if (bmvtype != BMV_TYPE_DIRECT && idx_mbmode & 1) {
2055                 get_mvdata_interlaced(v, &dmv_x[bmvtype == BMV_TYPE_BACKWARD], &dmv_y[bmvtype == BMV_TYPE_BACKWARD], &pred_flag[bmvtype == BMV_TYPE_BACKWARD]);
2056             }
2057             if (interpmvp) {
2058                 get_mvdata_interlaced(v, &dmv_x[1], &dmv_y[1], &pred_flag[1]);
2059             }
2060             if (bmvtype == BMV_TYPE_DIRECT) {
2061                 dmv_x[0] = dmv_y[0] = pred_flag[0] = 0;
2062                 dmv_x[1] = dmv_y[1] = pred_flag[0] = 0;
2063                 if (!s->next_picture_ptr->field_picture) {
2064                     av_log(s->avctx, AV_LOG_ERROR, "Mixed field/frame direct mode not supported\n");
2065                     return;
2066                 }
2067             }
2068             ff_vc1_pred_b_mv_intfi(v, 0, dmv_x, dmv_y, 1, pred_flag);
2069             vc1_b_mc(v, dmv_x, dmv_y, (bmvtype == BMV_TYPE_DIRECT), bmvtype);
2070             mb_has_coeffs = !(idx_mbmode & 2);
2071         } else { // 4-MV
2072             if (fwd)
2073                 bmvtype = BMV_TYPE_FORWARD;
2074             v->bmvtype  = bmvtype;
2075             v->fourmvbp = get_vlc2(gb, v->fourmvbp_vlc->table, VC1_4MV_BLOCK_PATTERN_VLC_BITS, 1);
2076             for (i = 0; i < 4; i++) {
2077                 dmv_x[0] = dmv_y[0] = pred_flag[0] = 0;
2078                 dmv_x[1] = dmv_y[1] = pred_flag[1] = 0;
2079                 if (v->fourmvbp & (8 >> i)) {
2080                     get_mvdata_interlaced(v, &dmv_x[bmvtype == BMV_TYPE_BACKWARD],
2081                                              &dmv_y[bmvtype == BMV_TYPE_BACKWARD],
2082                                          &pred_flag[bmvtype == BMV_TYPE_BACKWARD]);
2083                 }
2084                 ff_vc1_pred_b_mv_intfi(v, i, dmv_x, dmv_y, 0, pred_flag);
2085                 ff_vc1_mc_4mv_luma(v, i, bmvtype == BMV_TYPE_BACKWARD, 0);
2086             }
2087             ff_vc1_mc_4mv_chroma(v, bmvtype == BMV_TYPE_BACKWARD);
2088             mb_has_coeffs = idx_mbmode & 1;
2089         }
2090         if (mb_has_coeffs)
2091             cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);
2092         if (cbp) {
2093             GET_MQUANT();
2094         }
2095         s->current_picture.qscale_table[mb_pos] = mquant;
2096         if (!v->ttmbf && cbp) {
2097             ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);
2098         }
2099         dst_idx = 0;
2100         for (i = 0; i < 6; i++) {
2101             s->dc_val[0][s->block_index[i]] = 0;
2102             dst_idx += i >> 2;
2103             val = ((cbp >> (5 - i)) & 1);
2104             off = (i & 4) ? 0 : (i & 1) * 8 + (i & 2) * 4 * s->linesize;
2105             if (val) {
2106                 pat = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,
2107                                          first_block, s->dest[dst_idx] + off,
2108                                          (i & 4) ? s->uvlinesize : s->linesize,
2109                                          CONFIG_GRAY && (i & 4) && (s->avctx->flags & AV_CODEC_FLAG_GRAY), &block_tt);
2110                 block_cbp |= pat << (i << 2);
2111                 if (!v->ttmbf && ttmb < 8)
2112                     ttmb = -1;
2113                 first_block = 0;
2114             }
2115         }
2116     }
2117     v->cbp[s->mb_x]      = block_cbp;
2118     v->ttblk[s->mb_x]    = block_tt;
2119 }
2120
2121 /** Decode one B-frame MB (in interlaced frame B picture)
2122  */
2123 static int vc1_decode_b_mb_intfr(VC1Context *v)
2124 {
2125     MpegEncContext *s = &v->s;
2126     GetBitContext *gb = &s->gb;
2127     int i, j;
2128     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
2129     int cbp = 0; /* cbp decoding stuff */
2130     int mqdiff, mquant; /* MB quantization */
2131     int ttmb = v->ttfrm; /* MB Transform type */
2132     int mvsw = 0; /* motion vector switch */
2133     int mb_has_coeffs = 1; /* last_flag */
2134     int dmv_x, dmv_y; /* Differential MV components */
2135     int val; /* temp value */
2136     int first_block = 1;
2137     int dst_idx, off;
2138     int skipped, direct, twomv = 0;
2139     int block_cbp = 0, pat, block_tt = 0;
2140     int idx_mbmode = 0, mvbp;
2141     int stride_y, fieldtx;
2142     int bmvtype = BMV_TYPE_BACKWARD;
2143     int dir, dir2;
2144
2145     mquant = v->pq; /* Lossy initialization */
2146     s->mb_intra = 0;
2147     if (v->skip_is_raw)
2148         skipped = get_bits1(gb);
2149     else
2150         skipped = v->s.mbskip_table[mb_pos];
2151
2152     if (!skipped) {
2153         idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_INTFR_NON4MV_MBMODE_VLC_BITS, 2);
2154         if (ff_vc1_mbmode_intfrp[0][idx_mbmode][0] == MV_PMODE_INTFR_2MV_FIELD) {
2155             twomv = 1;
2156             v->blk_mv_type[s->block_index[0]] = 1;
2157             v->blk_mv_type[s->block_index[1]] = 1;
2158             v->blk_mv_type[s->block_index[2]] = 1;
2159             v->blk_mv_type[s->block_index[3]] = 1;
2160         } else {
2161             v->blk_mv_type[s->block_index[0]] = 0;
2162             v->blk_mv_type[s->block_index[1]] = 0;
2163             v->blk_mv_type[s->block_index[2]] = 0;
2164             v->blk_mv_type[s->block_index[3]] = 0;
2165         }
2166     }
2167
2168     if (v->dmb_is_raw)
2169         direct = get_bits1(gb);
2170     else
2171         direct = v->direct_mb_plane[mb_pos];
2172
2173     if (direct) {
2174         if (s->next_picture_ptr->field_picture)
2175             av_log(s->avctx, AV_LOG_WARNING, "Mixed frame/field direct mode not supported\n");
2176         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);
2177         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);
2178         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);
2179         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);
2180
2181         if (twomv) {
2182             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);
2183             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);
2184             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);
2185             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);
2186
2187             for (i = 1; i < 4; i += 2) {
2188                 s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0] = s->mv[0][i-1][0];
2189                 s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1] = s->mv[0][i-1][1];
2190                 s->mv[1][i][0] = s->current_picture.motion_val[1][s->block_index[i]][0] = s->mv[1][i-1][0];
2191                 s->mv[1][i][1] = s->current_picture.motion_val[1][s->block_index[i]][1] = s->mv[1][i-1][1];
2192             }
2193         } else {
2194             for (i = 1; i < 4; i++) {
2195                 s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0] = s->mv[0][0][0];
2196                 s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1] = s->mv[0][0][1];
2197                 s->mv[1][i][0] = s->current_picture.motion_val[1][s->block_index[i]][0] = s->mv[1][0][0];
2198                 s->mv[1][i][1] = s->current_picture.motion_val[1][s->block_index[i]][1] = s->mv[1][0][1];
2199             }
2200         }
2201     }
2202
2203     if (ff_vc1_mbmode_intfrp[0][idx_mbmode][0] == MV_PMODE_INTFR_INTRA) { // intra MB
2204         for (i = 0; i < 4; i++) {
2205             s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0] = 0;
2206             s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1] = 0;
2207             s->mv[1][i][0] = s->current_picture.motion_val[1][s->block_index[i]][0] = 0;
2208             s->mv[1][i][1] = s->current_picture.motion_val[1][s->block_index[i]][1] = 0;
2209         }
2210         v->is_intra[s->mb_x] = 0x3f; // Set the bitfield to all 1.
2211         s->mb_intra          = 1;
2212         s->current_picture.mb_type[mb_pos] = MB_TYPE_INTRA;
2213         fieldtx = v->fieldtx_plane[mb_pos] = get_bits1(gb);
2214         mb_has_coeffs = get_bits1(gb);
2215         if (mb_has_coeffs)
2216             cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);
2217         v->s.ac_pred = v->acpred_plane[mb_pos] = get_bits1(gb);
2218         GET_MQUANT();
2219         s->current_picture.qscale_table[mb_pos] = mquant;
2220         /* Set DC scale - y and c use the same (not sure if necessary here) */
2221         s->y_dc_scale = s->y_dc_scale_table[mquant];
2222         s->c_dc_scale = s->c_dc_scale_table[mquant];
2223         dst_idx = 0;
2224         for (i = 0; i < 6; i++) {
2225             v->a_avail = v->c_avail          = 0;
2226             v->mb_type[0][s->block_index[i]] = 1;
2227             s->dc_val[0][s->block_index[i]]  = 0;
2228             dst_idx += i >> 2;
2229             val = ((cbp >> (5 - i)) & 1);
2230             if (i == 2 || i == 3 || !s->first_slice_line)
2231                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];
2232             if (i == 1 || i == 3 || s->mb_x)
2233                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];
2234
2235             vc1_decode_intra_block(v, s->block[i], i, val, mquant,
2236                                    (i & 4) ? v->codingset2 : v->codingset);
2237             if (CONFIG_GRAY && i > 3 && (s->avctx->flags & AV_CODEC_FLAG_GRAY))
2238                 continue;
2239             v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);
2240             if (i < 4) {
2241                 stride_y = s->linesize << fieldtx;
2242                 off = (fieldtx) ? ((i & 1) * 8) + ((i & 2) >> 1) * s->linesize : (i & 1) * 8 + 4 * (i & 2) * s->linesize;
2243             } else {
2244                 stride_y = s->uvlinesize;
2245                 off = 0;
2246             }
2247             s->idsp.put_signed_pixels_clamped(s->block[i],
2248                                               s->dest[dst_idx] + off,
2249                                               stride_y);
2250         }
2251     } else {
2252         s->mb_intra = v->is_intra[s->mb_x] = 0;
2253         if (!direct) {
2254             if (skipped || !s->mb_intra) {
2255                 bmvtype = decode012(gb);
2256                 switch (bmvtype) {
2257                 case 0:
2258                     bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_BACKWARD : BMV_TYPE_FORWARD;
2259                     break;
2260                 case 1:
2261                     bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_FORWARD : BMV_TYPE_BACKWARD;
2262                     break;
2263                 case 2:
2264                     bmvtype  = BMV_TYPE_INTERPOLATED;
2265                 }
2266             }
2267
2268             if (twomv && bmvtype != BMV_TYPE_INTERPOLATED)
2269                 mvsw = get_bits1(gb);
2270         }
2271
2272         if (!skipped) { // inter MB
2273             mb_has_coeffs = ff_vc1_mbmode_intfrp[0][idx_mbmode][3];
2274             if (mb_has_coeffs)
2275                 cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);
2276             if (!direct) {
2277                 if (bmvtype == BMV_TYPE_INTERPOLATED && twomv) {
2278                     v->fourmvbp = get_vlc2(gb, v->fourmvbp_vlc->table, VC1_4MV_BLOCK_PATTERN_VLC_BITS, 1);
2279                 } else if (bmvtype == BMV_TYPE_INTERPOLATED || twomv) {
2280                     v->twomvbp = get_vlc2(gb, v->twomvbp_vlc->table, VC1_2MV_BLOCK_PATTERN_VLC_BITS, 1);
2281                 }
2282             }
2283
2284             for (i = 0; i < 6; i++)
2285                 v->mb_type[0][s->block_index[i]] = 0;
2286             fieldtx = v->fieldtx_plane[mb_pos] = ff_vc1_mbmode_intfrp[0][idx_mbmode][1];
2287             /* for all motion vector read MVDATA and motion compensate each block */
2288             dst_idx = 0;
2289             if (direct) {
2290                 if (twomv) {
2291                     for (i = 0; i < 4; i++) {
2292                         ff_vc1_mc_4mv_luma(v, i, 0, 0);
2293                         ff_vc1_mc_4mv_luma(v, i, 1, 1);
2294                     }
2295                     ff_vc1_mc_4mv_chroma4(v, 0, 0, 0);
2296                     ff_vc1_mc_4mv_chroma4(v, 1, 1, 1);
2297                 } else {
2298                     ff_vc1_mc_1mv(v, 0);
2299                     ff_vc1_interp_mc(v);
2300                 }
2301             } else if (twomv && bmvtype == BMV_TYPE_INTERPOLATED) {
2302                 mvbp = v->fourmvbp;
2303                 for (i = 0; i < 4; i++) {
2304                     dir = i==1 || i==3;
2305                     dmv_x = dmv_y = 0;
2306                     val = ((mvbp >> (3 - i)) & 1);
2307                     if (val)
2308                         get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);
2309                     j = i > 1 ? 2 : 0;
2310                     ff_vc1_pred_mv_intfr(v, j, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0], dir);
2311                     ff_vc1_mc_4mv_luma(v, j, dir, dir);
2312                     ff_vc1_mc_4mv_luma(v, j+1, dir, dir);
2313                 }
2314
2315                 ff_vc1_mc_4mv_chroma4(v, 0, 0, 0);
2316                 ff_vc1_mc_4mv_chroma4(v, 1, 1, 1);
2317             } else if (bmvtype == BMV_TYPE_INTERPOLATED) {
2318                 mvbp = v->twomvbp;
2319                 dmv_x = dmv_y = 0;
2320                 if (mvbp & 2)
2321                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);
2322
2323                 ff_vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], 0);
2324                 ff_vc1_mc_1mv(v, 0);
2325
2326                 dmv_x = dmv_y = 0;
2327                 if (mvbp & 1)
2328                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);
2329
2330                 ff_vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], 1);
2331                 ff_vc1_interp_mc(v);
2332             } else if (twomv) {
2333                 dir = bmvtype == BMV_TYPE_BACKWARD;
2334                 dir2 = dir;
2335                 if (mvsw)
2336                     dir2 = !dir;
2337                 mvbp = v->twomvbp;
2338                 dmv_x = dmv_y = 0;
2339                 if (mvbp & 2)
2340                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);
2341                 ff_vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0], dir);
2342
2343                 dmv_x = dmv_y = 0;
2344                 if (mvbp & 1)
2345                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);
2346                 ff_vc1_pred_mv_intfr(v, 2, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0], dir2);
2347
2348                 if (mvsw) {
2349                     for (i = 0; i < 2; i++) {
2350                         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];
2351                         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];
2352                         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];
2353                         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];
2354                     }
2355                 } else {
2356                     ff_vc1_pred_mv_intfr(v, 0, 0, 0, 2, v->range_x, v->range_y, v->mb_type[0], !dir);
2357                     ff_vc1_pred_mv_intfr(v, 2, 0, 0, 2, v->range_x, v->range_y, v->mb_type[0], !dir);
2358                 }
2359
2360                 ff_vc1_mc_4mv_luma(v, 0, dir, 0);
2361                 ff_vc1_mc_4mv_luma(v, 1, dir, 0);
2362                 ff_vc1_mc_4mv_luma(v, 2, dir2, 0);
2363                 ff_vc1_mc_4mv_luma(v, 3, dir2, 0);
2364                 ff_vc1_mc_4mv_chroma4(v, dir, dir2, 0);
2365             } else {
2366                 dir = bmvtype == BMV_TYPE_BACKWARD;
2367
2368                 mvbp = ff_vc1_mbmode_intfrp[0][idx_mbmode][2];
2369                 dmv_x = dmv_y = 0;
2370                 if (mvbp)
2371                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);
2372
2373                 ff_vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], dir);
2374                 v->blk_mv_type[s->block_index[0]] = 1;
2375                 v->blk_mv_type[s->block_index[1]] = 1;
2376                 v->blk_mv_type[s->block_index[2]] = 1;
2377                 v->blk_mv_type[s->block_index[3]] = 1;
2378                 ff_vc1_pred_mv_intfr(v, 0, 0, 0, 2, v->range_x, v->range_y, 0, !dir);
2379                 for (i = 0; i < 2; i++) {
2380                     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];
2381                     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];
2382                 }
2383                 ff_vc1_mc_1mv(v, dir);
2384             }
2385
2386             if (cbp)
2387                 GET_MQUANT();  // p. 227
2388             s->current_picture.qscale_table[mb_pos] = mquant;
2389             if (!v->ttmbf && cbp)
2390                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);
2391             for (i = 0; i < 6; i++) {
2392                 s->dc_val[0][s->block_index[i]] = 0;
2393                 dst_idx += i >> 2;
2394                 val = ((cbp >> (5 - i)) & 1);
2395                 if (!fieldtx)
2396                     off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);
2397                 else
2398                     off = (i & 4) ? 0 : ((i & 1) * 8 + ((i > 1) * s->linesize));
2399                 if (val) {
2400                     pat = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,
2401                                              first_block, s->dest[dst_idx] + off,
2402                                              (i & 4) ? s->uvlinesize : (s->linesize << fieldtx),
2403                                              CONFIG_GRAY && (i & 4) && (s->avctx->flags & AV_CODEC_FLAG_GRAY), &block_tt);
2404                     block_cbp |= pat << (i << 2);
2405                     if (!v->ttmbf && ttmb < 8)
2406                         ttmb = -1;
2407                     first_block = 0;
2408                 }
2409             }
2410
2411         } else { // skipped
2412             dir = 0;
2413             for (i = 0; i < 6; i++) {
2414                 v->mb_type[0][s->block_index[i]] = 0;
2415                 s->dc_val[0][s->block_index[i]] = 0;
2416             }
2417             s->current_picture.mb_type[mb_pos]      = MB_TYPE_SKIP;
2418             s->current_picture.qscale_table[mb_pos] = 0;
2419             v->blk_mv_type[s->block_index[0]] = 0;
2420             v->blk_mv_type[s->block_index[1]] = 0;
2421             v->blk_mv_type[s->block_index[2]] = 0;
2422             v->blk_mv_type[s->block_index[3]] = 0;
2423
2424             if (!direct) {
2425                 if (bmvtype == BMV_TYPE_INTERPOLATED) {
2426                     ff_vc1_pred_mv_intfr(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0], 0);
2427                     ff_vc1_pred_mv_intfr(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0], 1);
2428                 } else {
2429                     dir = bmvtype == BMV_TYPE_BACKWARD;
2430                     ff_vc1_pred_mv_intfr(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0], dir);
2431                     if (mvsw) {
2432                         int dir2 = dir;
2433                         if (mvsw)
2434                             dir2 = !dir;
2435                         for (i = 0; i < 2; i++) {
2436                             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];
2437                             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];
2438                             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];
2439                             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];
2440                         }
2441                     } else {
2442                         v->blk_mv_type[s->block_index[0]] = 1;
2443                         v->blk_mv_type[s->block_index[1]] = 1;
2444                         v->blk_mv_type[s->block_index[2]] = 1;
2445                         v->blk_mv_type[s->block_index[3]] = 1;
2446                         ff_vc1_pred_mv_intfr(v, 0, 0, 0, 2, v->range_x, v->range_y, 0, !dir);
2447                         for (i = 0; i < 2; i++) {
2448                             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];
2449                             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];
2450                         }
2451                     }
2452                 }
2453             }
2454
2455             ff_vc1_mc_1mv(v, dir);
2456             if (direct || bmvtype == BMV_TYPE_INTERPOLATED) {
2457                 ff_vc1_interp_mc(v);
2458             }
2459             v->fieldtx_plane[mb_pos] = 0;
2460         }
2461     }
2462     v->cbp[s->mb_x]      = block_cbp;
2463     v->ttblk[s->mb_x]    = block_tt;
2464
2465     return 0;
2466 }
2467
2468 /** Decode blocks of I-frame
2469  */
2470 static void vc1_decode_i_blocks(VC1Context *v)
2471 {
2472     int k, j;
2473     MpegEncContext *s = &v->s;
2474     int cbp, val;
2475     uint8_t *coded_val;
2476     int mb_pos;
2477
2478     /* select coding mode used for VLC tables selection */
2479     switch (v->y_ac_table_index) {
2480     case 0:
2481         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;
2482         break;
2483     case 1:
2484         v->codingset = CS_HIGH_MOT_INTRA;
2485         break;
2486     case 2:
2487         v->codingset = CS_MID_RATE_INTRA;
2488         break;
2489     }
2490
2491     switch (v->c_ac_table_index) {
2492     case 0:
2493         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;
2494         break;
2495     case 1:
2496         v->codingset2 = CS_HIGH_MOT_INTER;
2497         break;
2498     case 2:
2499         v->codingset2 = CS_MID_RATE_INTER;
2500         break;
2501     }
2502
2503     /* Set DC scale - y and c use the same */
2504     s->y_dc_scale = s->y_dc_scale_table[v->pq];
2505     s->c_dc_scale = s->c_dc_scale_table[v->pq];
2506
2507     //do frame decode
2508     s->mb_x = s->mb_y = 0;
2509     s->mb_intra         = 1;
2510     s->first_slice_line = 1;
2511     for (s->mb_y = 0; s->mb_y < s->end_mb_y; s->mb_y++) {
2512         s->mb_x = 0;
2513         init_block_index(v);
2514         for (; s->mb_x < v->end_mb_x; s->mb_x++) {
2515             uint8_t *dst[6];
2516             ff_update_block_index(s);
2517             dst[0] = s->dest[0];
2518             dst[1] = dst[0] + 8;
2519             dst[2] = s->dest[0] + s->linesize * 8;
2520             dst[3] = dst[2] + 8;
2521             dst[4] = s->dest[1];
2522             dst[5] = s->dest[2];
2523             s->bdsp.clear_blocks(s->block[0]);
2524             mb_pos = s->mb_x + s->mb_y * s->mb_width;
2525             s->current_picture.mb_type[mb_pos]                     = MB_TYPE_INTRA;
2526             s->current_picture.qscale_table[mb_pos]                = v->pq;
2527             s->current_picture.motion_val[1][s->block_index[0]][0] = 0;
2528             s->current_picture.motion_val[1][s->block_index[0]][1] = 0;
2529
2530             // do actual MB decoding and displaying
2531             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);
2532             v->s.ac_pred = get_bits1(&v->s.gb);
2533
2534             for (k = 0; k < 6; k++) {
2535                 val = ((cbp >> (5 - k)) & 1);
2536
2537                 if (k < 4) {
2538                     int pred   = vc1_coded_block_pred(&v->s, k, &coded_val);
2539                     val        = val ^ pred;
2540                     *coded_val = val;
2541                 }
2542                 cbp |= val << (5 - k);
2543
2544                 vc1_decode_i_block(v, s->block[k], k, val, (k < 4) ? v->codingset : v->codingset2);
2545
2546                 if (CONFIG_GRAY && k > 3 && (s->avctx->flags & AV_CODEC_FLAG_GRAY))
2547                     continue;
2548                 v->vc1dsp.vc1_inv_trans_8x8(s->block[k]);
2549                 if (v->pq >= 9 && v->overlap) {
2550                     if (v->rangeredfrm)
2551                         for (j = 0; j < 64; j++)
2552                             s->block[k][j] <<= 1;
2553                     s->idsp.put_signed_pixels_clamped(s->block[k], dst[k],
2554                                                       k & 4 ? s->uvlinesize
2555                                                             : s->linesize);
2556                 } else {
2557                     if (v->rangeredfrm)
2558                         for (j = 0; j < 64; j++)
2559                             s->block[k][j] = (s->block[k][j] - 64) << 1;
2560                     s->idsp.put_pixels_clamped(s->block[k], dst[k],
2561                                                k & 4 ? s->uvlinesize
2562                                                      : s->linesize);
2563                 }
2564             }
2565
2566             if (v->pq >= 9 && v->overlap) {
2567                 if (s->mb_x) {
2568                     v->vc1dsp.vc1_h_overlap(s->dest[0], s->linesize);
2569                     v->vc1dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize, s->linesize);
2570                     if (!CONFIG_GRAY || !(s->avctx->flags & AV_CODEC_FLAG_GRAY)) {
2571                         v->vc1dsp.vc1_h_overlap(s->dest[1], s->uvlinesize);
2572                         v->vc1dsp.vc1_h_overlap(s->dest[2], s->uvlinesize);
2573                     }
2574                 }
2575                 v->vc1dsp.vc1_h_overlap(s->dest[0] + 8, s->linesize);
2576                 v->vc1dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);
2577                 if (!s->first_slice_line) {
2578                     v->vc1dsp.vc1_v_overlap(s->dest[0], s->linesize);
2579                     v->vc1dsp.vc1_v_overlap(s->dest[0] + 8, s->linesize);
2580                     if (!CONFIG_GRAY || !(s->avctx->flags & AV_CODEC_FLAG_GRAY)) {
2581                         v->vc1dsp.vc1_v_overlap(s->dest[1], s->uvlinesize);
2582                         v->vc1dsp.vc1_v_overlap(s->dest[2], s->uvlinesize);
2583                     }
2584                 }
2585                 v->vc1dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize, s->linesize);
2586                 v->vc1dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);
2587             }
2588             if (v->s.loop_filter)
2589                 ff_vc1_loop_filter_iblk(v, v->pq);
2590
2591             if (get_bits_count(&s->gb) > v->bits) {
2592                 ff_er_add_slice(&s->er, 0, 0, s->mb_x, s->mb_y, ER_MB_ERROR);
2593                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n",
2594                        get_bits_count(&s->gb), v->bits);
2595                 return;
2596             }
2597         }
2598         if (!v->s.loop_filter)
2599             ff_mpeg_draw_horiz_band(s, s->mb_y * 16, 16);
2600         else if (s->mb_y)
2601             ff_mpeg_draw_horiz_band(s, (s->mb_y - 1) * 16, 16);
2602
2603         s->first_slice_line = 0;
2604     }
2605     if (v->s.loop_filter)
2606         ff_mpeg_draw_horiz_band(s, (s->end_mb_y - 1) * 16, 16);
2607
2608     /* This is intentionally mb_height and not end_mb_y - unlike in advanced
2609      * profile, these only differ are when decoding MSS2 rectangles. */
2610     ff_er_add_slice(&s->er, 0, 0, s->mb_width - 1, s->mb_height - 1, ER_MB_END);
2611 }
2612
2613 /** Decode blocks of I-frame for advanced profile
2614  */
2615 static void vc1_decode_i_blocks_adv(VC1Context *v)
2616 {
2617     int k;
2618     MpegEncContext *s = &v->s;
2619     int cbp, val;
2620     uint8_t *coded_val;
2621     int mb_pos;
2622     int mquant = v->pq;
2623     int mqdiff;
2624     GetBitContext *gb = &s->gb;
2625
2626     /* select coding mode used for VLC tables selection */
2627     switch (v->y_ac_table_index) {
2628     case 0:
2629         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;
2630         break;
2631     case 1:
2632         v->codingset = CS_HIGH_MOT_INTRA;
2633         break;
2634     case 2:
2635         v->codingset = CS_MID_RATE_INTRA;
2636         break;
2637     }
2638
2639     switch (v->c_ac_table_index) {
2640     case 0:
2641         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;
2642         break;
2643     case 1:
2644         v->codingset2 = CS_HIGH_MOT_INTER;
2645         break;
2646     case 2:
2647         v->codingset2 = CS_MID_RATE_INTER;
2648         break;
2649     }
2650
2651     // do frame decode
2652     s->mb_x             = s->mb_y = 0;
2653     s->mb_intra         = 1;
2654     s->first_slice_line = 1;
2655     s->mb_y             = s->start_mb_y;
2656     if (s->start_mb_y) {
2657         s->mb_x = 0;
2658         init_block_index(v);
2659         memset(&s->coded_block[s->block_index[0] - s->b8_stride], 0,
2660                (1 + s->b8_stride) * sizeof(*s->coded_block));
2661     }
2662     for (; s->mb_y < s->end_mb_y; s->mb_y++) {
2663         s->mb_x = 0;
2664         init_block_index(v);
2665         for (;s->mb_x < s->mb_width; s->mb_x++) {
2666             int16_t (*block)[64] = v->block[v->cur_blk_idx];
2667             ff_update_block_index(s);
2668             s->bdsp.clear_blocks(block[0]);
2669             mb_pos = s->mb_x + s->mb_y * s->mb_stride;
2670             s->current_picture.mb_type[mb_pos + v->mb_off]                         = MB_TYPE_INTRA;
2671             s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][0] = 0;
2672             s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][1] = 0;
2673
2674             // do actual MB decoding and displaying
2675             if (v->fieldtx_is_raw)
2676                 v->fieldtx_plane[mb_pos] = get_bits1(&v->s.gb);
2677             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);
2678             if (v->acpred_is_raw)
2679                 v->s.ac_pred = get_bits1(&v->s.gb);
2680             else
2681                 v->s.ac_pred = v->acpred_plane[mb_pos];
2682
2683             if (v->condover == CONDOVER_SELECT && v->overflg_is_raw)
2684                 v->over_flags_plane[mb_pos] = get_bits1(&v->s.gb);
2685
2686             GET_MQUANT();
2687
2688             s->current_picture.qscale_table[mb_pos] = mquant;
2689             /* Set DC scale - y and c use the same */
2690             s->y_dc_scale = s->y_dc_scale_table[mquant];
2691             s->c_dc_scale = s->c_dc_scale_table[mquant];
2692
2693             for (k = 0; k < 6; k++) {
2694                 v->mb_type[0][s->block_index[k]] = 1;
2695
2696                 val = ((cbp >> (5 - k)) & 1);
2697
2698                 if (k < 4) {
2699                     int pred   = vc1_coded_block_pred(&v->s, k, &coded_val);
2700                     val        = val ^ pred;
2701                     *coded_val = val;
2702                 }
2703                 cbp |= val << (5 - k);
2704
2705                 v->a_avail = !s->first_slice_line || (k == 2 || k == 3);
2706                 v->c_avail = !!s->mb_x || (k == 1 || k == 3);
2707
2708                 vc1_decode_i_block_adv(v, block[k], k, val,
2709                                        (k < 4) ? v->codingset : v->codingset2, mquant);
2710
2711                 if (CONFIG_GRAY && k > 3 && (s->avctx->flags & AV_CODEC_FLAG_GRAY))
2712                     continue;
2713                 v->vc1dsp.vc1_inv_trans_8x8(block[k]);
2714             }
2715
2716             if (v->overlap && v->condover != CONDOVER_NONE)
2717                 ff_vc1_i_overlap_filter(v);
2718             vc1_put_signed_blocks_clamped(v);
2719             if (v->s.loop_filter)
2720                 ff_vc1_i_loop_filter(v);
2721
2722             if (get_bits_count(&s->gb) > v->bits) {
2723                 // TODO: may need modification to handle slice coding
2724                 ff_er_add_slice(&s->er, 0, s->start_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR);
2725                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n",
2726                        get_bits_count(&s->gb), v->bits);
2727                 return;
2728             }
2729             inc_blk_idx(v->topleft_blk_idx);
2730             inc_blk_idx(v->top_blk_idx);
2731             inc_blk_idx(v->left_blk_idx);
2732             inc_blk_idx(v->cur_blk_idx);
2733         }
2734         if (!v->s.loop_filter)
2735             ff_mpeg_draw_horiz_band(s, s->mb_y * 16, 16);
2736         else if (s->mb_y)
2737             ff_mpeg_draw_horiz_band(s, (s->mb_y-1) * 16, 16);
2738         s->first_slice_line = 0;
2739     }
2740
2741     if (v->s.loop_filter)
2742         ff_mpeg_draw_horiz_band(s, (s->end_mb_y - 1) * 16, 16);
2743     ff_er_add_slice(&s->er, 0, s->start_mb_y << v->field_mode, s->mb_width - 1,
2744                     (s->end_mb_y << v->field_mode) - 1, ER_MB_END);
2745 }
2746
2747 static void vc1_decode_p_blocks(VC1Context *v)
2748 {
2749     MpegEncContext *s = &v->s;
2750     int apply_loop_filter;
2751
2752     /* select coding mode used for VLC tables selection */
2753     switch (v->c_ac_table_index) {
2754     case 0:
2755         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;
2756         break;
2757     case 1:
2758         v->codingset = CS_HIGH_MOT_INTRA;
2759         break;
2760     case 2:
2761         v->codingset = CS_MID_RATE_INTRA;
2762         break;
2763     }
2764
2765     switch (v->c_ac_table_index) {
2766     case 0:
2767         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;
2768         break;
2769     case 1:
2770         v->codingset2 = CS_HIGH_MOT_INTER;
2771         break;
2772     case 2:
2773         v->codingset2 = CS_MID_RATE_INTER;
2774         break;
2775     }
2776
2777     apply_loop_filter   = s->loop_filter && !(s->avctx->skip_loop_filter >= AVDISCARD_NONKEY);
2778     s->first_slice_line = 1;
2779     memset(v->cbp_base, 0, sizeof(v->cbp_base[0]) * 3 * s->mb_stride);
2780     for (s->mb_y = s->start_mb_y; s->mb_y < s->end_mb_y; s->mb_y++) {
2781         s->mb_x = 0;
2782         init_block_index(v);
2783         for (; s->mb_x < s->mb_width; s->mb_x++) {
2784             ff_update_block_index(s);
2785
2786             if (v->fcm == ILACE_FIELD) {
2787                 vc1_decode_p_mb_intfi(v);
2788                 if (apply_loop_filter)
2789                     ff_vc1_p_loop_filter(v);
2790             } else if (v->fcm == ILACE_FRAME) {
2791                 vc1_decode_p_mb_intfr(v);
2792                 if (apply_loop_filter)
2793                     ff_vc1_p_intfr_loop_filter(v);
2794             } else {
2795                 vc1_decode_p_mb(v);
2796                 if (apply_loop_filter)
2797                     ff_vc1_p_loop_filter(v);
2798             }
2799             if (get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {
2800                 // TODO: may need modification to handle slice coding
2801                 ff_er_add_slice(&s->er, 0, s->start_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR);
2802                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i at %ix%i\n",
2803                        get_bits_count(&s->gb), v->bits, s->mb_x, s->mb_y);
2804                 return;
2805             }
2806             inc_blk_idx(v->topleft_blk_idx);
2807             inc_blk_idx(v->top_blk_idx);
2808             inc_blk_idx(v->left_blk_idx);
2809             inc_blk_idx(v->cur_blk_idx);
2810         }
2811         memmove(v->cbp_base,
2812                 v->cbp - s->mb_stride,
2813                 sizeof(v->cbp_base[0]) * 2 * s->mb_stride);
2814         memmove(v->ttblk_base,
2815                 v->ttblk - s->mb_stride,
2816                 sizeof(v->ttblk_base[0]) * 2 * s->mb_stride);
2817         memmove(v->is_intra_base,
2818                 v->is_intra - s->mb_stride,
2819                 sizeof(v->is_intra_base[0]) * 2 * s->mb_stride);
2820         memmove(v->luma_mv_base,
2821                 v->luma_mv - s->mb_stride,
2822                 sizeof(v->luma_mv_base[0]) * 2 * s->mb_stride);
2823         if (s->mb_y != s->start_mb_y)
2824             ff_mpeg_draw_horiz_band(s, (s->mb_y - 1) * 16, 16);
2825         s->first_slice_line = 0;
2826     }
2827     if (s->end_mb_y >= s->start_mb_y)
2828         ff_mpeg_draw_horiz_band(s, (s->end_mb_y - 1) * 16, 16);
2829     ff_er_add_slice(&s->er, 0, s->start_mb_y << v->field_mode, s->mb_width - 1,
2830                     (s->end_mb_y << v->field_mode) - 1, ER_MB_END);
2831 }
2832
2833 static void vc1_decode_b_blocks(VC1Context *v)
2834 {
2835     MpegEncContext *s = &v->s;
2836
2837     /* select coding mode used for VLC tables selection */
2838     switch (v->c_ac_table_index) {
2839     case 0:
2840         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;
2841         break;
2842     case 1:
2843         v->codingset = CS_HIGH_MOT_INTRA;
2844         break;
2845     case 2:
2846         v->codingset = CS_MID_RATE_INTRA;
2847         break;
2848     }
2849
2850     switch (v->c_ac_table_index) {
2851     case 0:
2852         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;
2853         break;
2854     case 1:
2855         v->codingset2 = CS_HIGH_MOT_INTER;
2856         break;
2857     case 2:
2858         v->codingset2 = CS_MID_RATE_INTER;
2859         break;
2860     }
2861
2862     s->first_slice_line = 1;
2863     for (s->mb_y = s->start_mb_y; s->mb_y < s->end_mb_y; s->mb_y++) {
2864         s->mb_x = 0;
2865         init_block_index(v);
2866         for (; s->mb_x < s->mb_width; s->mb_x++) {
2867             ff_update_block_index(s);
2868
2869             if (v->fcm == ILACE_FIELD) {
2870                 vc1_decode_b_mb_intfi(v);
2871                 if (v->s.loop_filter)
2872                     ff_vc1_b_intfi_loop_filter(v);
2873             } else if (v->fcm == ILACE_FRAME) {
2874                 vc1_decode_b_mb_intfr(v);
2875                 if (v->s.loop_filter)
2876                     ff_vc1_p_intfr_loop_filter(v);
2877             } else {
2878                 vc1_decode_b_mb(v);
2879                 if (v->s.loop_filter)
2880                     ff_vc1_i_loop_filter(v);
2881             }
2882             if (get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {
2883                 // TODO: may need modification to handle slice coding
2884                 ff_er_add_slice(&s->er, 0, s->start_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR);
2885                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i at %ix%i\n",
2886                        get_bits_count(&s->gb), v->bits, s->mb_x, s->mb_y);
2887                 return;
2888             }
2889         }
2890         memmove(v->cbp_base,
2891                 v->cbp - s->mb_stride,
2892                 sizeof(v->cbp_base[0]) * 2 * s->mb_stride);
2893         memmove(v->ttblk_base,
2894                 v->ttblk - s->mb_stride,
2895                 sizeof(v->ttblk_base[0]) * 2 * s->mb_stride);
2896         memmove(v->is_intra_base,
2897                 v->is_intra - s->mb_stride,
2898                 sizeof(v->is_intra_base[0]) * 2 * s->mb_stride);
2899         if (!v->s.loop_filter)
2900             ff_mpeg_draw_horiz_band(s, s->mb_y * 16, 16);
2901         else if (s->mb_y)
2902             ff_mpeg_draw_horiz_band(s, (s->mb_y - 1) * 16, 16);
2903         s->first_slice_line = 0;
2904     }
2905     if (v->s.loop_filter)
2906         ff_mpeg_draw_horiz_band(s, (s->end_mb_y - 1) * 16, 16);
2907     ff_er_add_slice(&s->er, 0, s->start_mb_y << v->field_mode, s->mb_width - 1,
2908                     (s->end_mb_y << v->field_mode) - 1, ER_MB_END);
2909 }
2910
2911 static void vc1_decode_skip_blocks(VC1Context *v)
2912 {
2913     MpegEncContext *s = &v->s;
2914
2915     if (!v->s.last_picture.f->data[0])
2916         return;
2917
2918     ff_er_add_slice(&s->er, 0, s->start_mb_y, s->mb_width - 1, s->end_mb_y - 1, ER_MB_END);
2919     s->first_slice_line = 1;
2920     for (s->mb_y = s->start_mb_y; s->mb_y < s->end_mb_y; s->mb_y++) {
2921         s->mb_x = 0;
2922         init_block_index(v);
2923         ff_update_block_index(s);
2924         memcpy(s->dest[0], s->last_picture.f->data[0] + s->mb_y * 16 * s->linesize,   s->linesize   * 16);
2925         memcpy(s->dest[1], s->last_picture.f->data[1] + s->mb_y *  8 * s->uvlinesize, s->uvlinesize *  8);
2926         memcpy(s->dest[2], s->last_picture.f->data[2] + s->mb_y *  8 * s->uvlinesize, s->uvlinesize *  8);
2927         ff_mpeg_draw_horiz_band(s, s->mb_y * 16, 16);
2928         s->first_slice_line = 0;
2929     }
2930     s->pict_type = AV_PICTURE_TYPE_P;
2931 }
2932
2933 void ff_vc1_decode_blocks(VC1Context *v)
2934 {
2935
2936     v->s.esc3_level_length = 0;
2937     if (v->x8_type) {
2938         ff_intrax8_decode_picture(&v->x8, &v->s.current_picture,
2939                                   &v->s.gb, &v->s.mb_x, &v->s.mb_y,
2940                                   2 * v->pq + v->halfpq, v->pq * !v->pquantizer,
2941                                   v->s.loop_filter, v->s.low_delay);
2942
2943         ff_er_add_slice(&v->s.er, 0, 0,
2944                         (v->s.mb_x >> 1) - 1, (v->s.mb_y >> 1) - 1,
2945                         ER_MB_END);
2946     } else {
2947         v->cur_blk_idx     =  0;
2948         v->left_blk_idx    = -1;
2949         v->topleft_blk_idx =  1;
2950         v->top_blk_idx     =  2;
2951         switch (v->s.pict_type) {
2952         case AV_PICTURE_TYPE_I:
2953             if (v->profile == PROFILE_ADVANCED)
2954                 vc1_decode_i_blocks_adv(v);
2955             else
2956                 vc1_decode_i_blocks(v);
2957             break;
2958         case AV_PICTURE_TYPE_P:
2959             if (v->p_frame_skipped)
2960                 vc1_decode_skip_blocks(v);
2961             else
2962                 vc1_decode_p_blocks(v);
2963             break;
2964         case AV_PICTURE_TYPE_B:
2965             if (v->bi_type) {
2966                 if (v->profile == PROFILE_ADVANCED)
2967                     vc1_decode_i_blocks_adv(v);
2968                 else
2969                     vc1_decode_i_blocks(v);
2970             } else
2971                 vc1_decode_b_blocks(v);
2972             break;
2973         }
2974     }
2975 }