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   1 /*
   2  * MPEG-1/2 decoder
   3  * Copyright (c) 2000, 2001 Fabrice Bellard
   4  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
   5  *
   6  * This file is part of FFmpeg.
   7  *
   8  * FFmpeg is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * FFmpeg is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with FFmpeg; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 /**
  24  * @file
  25  * MPEG-1/2 decoder
  26  */
  27
  28 #define UNCHECKED_BITSTREAM_READER 1
  29
  30 //#define DEBUG
  31 #include "internal.h"
  32 #include "avcodec.h"
  33 #include "dsputil.h"
  34 #include "mpegvideo.h"
  35 #include "libavutil/avassert.h"
  36 #include "libavutil/timecode.h"
  37
  38 #include "mpeg12.h"
  39 #include "mpeg12data.h"
  40 #include "mpeg12decdata.h"
  41 #include "bytestream.h"
  42 #include "vdpau_internal.h"
  43 #include "xvmc_internal.h"
  44 #include "thread.h"
  45
  46
  47 #define MV_VLC_BITS 9
  48 #define MBINCR_VLC_BITS 9
  49 #define MB_PAT_VLC_BITS 9
  50 #define MB_PTYPE_VLC_BITS 6
  51 #define MB_BTYPE_VLC_BITS 6
  52
  53 static VLC mv_vlc;
  54
  55 /* as H.263, but only 17 codes */
  56 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
  57 {
  58     int code, sign, val, shift;
  59
  60     code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
  61     if (code == 0) {
  62         return pred;
  63     }
  64     if (code < 0) {
  65         return 0xffff;
  66     }
  67
  68     sign  = get_bits1(&s->gb);
  69     shift = fcode - 1;
  70     val   = code;
  71     if (shift) {
  72         val  = (val - 1) << shift;
  73         val |= get_bits(&s->gb, shift);
  74         val++;
  75     }
  76     if (sign)
  77         val = -val;
  78     val += pred;
  79
  80     /* modulo decoding */
  81     return sign_extend(val, 5 + shift);
  82 }
  83
  84 static inline int mpeg1_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n)
  85 {
  86     int level, dc, diff, i, j, run;
  87     int component;
  88     RLTable *rl = &ff_rl_mpeg1;
  89     uint8_t * const scantable    = s->intra_scantable.permutated;
  90     const uint16_t *quant_matrix = s->intra_matrix;
  91     const int qscale             = s->qscale;
  92
  93     /* DC coefficient */
  94     component = (n <= 3 ? 0 : n - 4 + 1);
  95     diff = decode_dc(&s->gb, component);
  96     if (diff >= 0xffff)
  97         return -1;
  98     dc  = s->last_dc[component];
  99     dc += diff;
 100     s->last_dc[component] = dc;
 101     block[0] = dc * quant_matrix[0];
 102     av_dlog(s->avctx, "dc=%d diff=%d\n", dc, diff);
 103     i = 0;
 104     {
 105         OPEN_READER(re, &s->gb);
 106         /* now quantify & encode AC coefficients */
 107         for (;;) {
 108             UPDATE_CACHE(re, &s->gb);
 109             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
 110
 111             if (level == 127) {
 112                 break;
 113             } else if (level != 0) {
 114                 i += run;
 115                 j = scantable[i];
 116                 level = (level * qscale * quant_matrix[j]) >> 4;
 117                 level = (level - 1) | 1;
 118                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
 119                 LAST_SKIP_BITS(re, &s->gb, 1);
 120             } else {
 121                 /* escape */
 122                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
 123                 UPDATE_CACHE(re, &s->gb);
 124                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
 125                 if (level == -128) {
 126                     level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
 127                 } else if (level == 0) {
 128                     level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
 129                 }
 130                 i += run;
 131                 j = scantable[i];
 132                 if (level < 0) {
 133                     level = -level;
 134                     level = (level * qscale * quant_matrix[j]) >> 4;
 135                     level = (level - 1) | 1;
 136                     level = -level;
 137                 } else {
 138                     level = (level * qscale * quant_matrix[j]) >> 4;
 139                     level = (level - 1) | 1;
 140                 }
 141             }
 142             if (i > 63) {
 143                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
 144                 return -1;
 145             }
 146
 147             block[j] = level;
 148         }
 149         CLOSE_READER(re, &s->gb);
 150     }
 151     s->block_last_index[n] = i;
 152    return 0;
 153 }
 154
 155 int ff_mpeg1_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n)
 156 {
 157     return mpeg1_decode_block_intra(s, block, n);
 158 }
 159
 160 static inline int mpeg1_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
 161 {
 162     int level, i, j, run;
 163     RLTable *rl = &ff_rl_mpeg1;
 164     uint8_t * const scantable    = s->intra_scantable.permutated;
 165     const uint16_t *quant_matrix = s->inter_matrix;
 166     const int qscale             = s->qscale;
 167
 168     {
 169         OPEN_READER(re, &s->gb);
 170         i = -1;
 171         // special case for first coefficient, no need to add second VLC table
 172         UPDATE_CACHE(re, &s->gb);
 173         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
 174             level = (3 * qscale * quant_matrix[0]) >> 5;
 175             level = (level - 1) | 1;
 176             if (GET_CACHE(re, &s->gb) & 0x40000000)
 177                 level = -level;
 178             block[0] = level;
 179             i++;
 180             SKIP_BITS(re, &s->gb, 2);
 181             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
 182                 goto end;
 183         }
 184         /* now quantify & encode AC coefficients */
 185         for (;;) {
 186             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
 187
 188             if (level != 0) {
 189                 i += run;
 190                 j = scantable[i];
 191                 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 192                 level = (level - 1) | 1;
 193                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
 194                 SKIP_BITS(re, &s->gb, 1);
 195             } else {
 196                 /* escape */
 197                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
 198                 UPDATE_CACHE(re, &s->gb);
 199                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
 200                 if (level == -128) {
 201                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
 202                 } else if (level == 0) {
 203                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
 204                 }
 205                 i += run;
 206                 j = scantable[i];
 207                 if (level < 0) {
 208                     level = -level;
 209                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 210                     level = (level - 1) | 1;
 211                     level = -level;
 212                 } else {
 213                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 214                     level = (level - 1) | 1;
 215                 }
 216             }
 217             if (i > 63) {
 218                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
 219                 return -1;
 220             }
 221
 222             block[j] = level;
 223             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
 224                 break;
 225             UPDATE_CACHE(re, &s->gb);
 226         }
 227 end:
 228         LAST_SKIP_BITS(re, &s->gb, 2);
 229         CLOSE_READER(re, &s->gb);
 230     }
 231     s->block_last_index[n] = i;
 232     return 0;
 233 }
 234
 235 /**
 236  * Note: this function can read out of range and crash for corrupt streams.
 237  * Changing this would eat up any speed benefits it has.
 238  * Do not use "fast" flag if you need the code to be robust.
 239  */
 240 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
 241 {
 242     int level, i, j, run;
 243     RLTable *rl = &ff_rl_mpeg1;
 244     uint8_t * const scantable = s->intra_scantable.permutated;
 245     const int qscale          = s->qscale;
 246
 247     {
 248         OPEN_READER(re, &s->gb);
 249         i = -1;
 250         // special case for first coefficient, no need to add second VLC table
 251         UPDATE_CACHE(re, &s->gb);
 252         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
 253             level = (3 * qscale) >> 1;
 254             level = (level - 1) | 1;
 255             if (GET_CACHE(re, &s->gb) & 0x40000000)
 256                 level = -level;
 257             block[0] = level;
 258             i++;
 259             SKIP_BITS(re, &s->gb, 2);
 260             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
 261                 goto end;
 262         }
 263
 264         /* now quantify & encode AC coefficients */
 265         for (;;) {
 266             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
 267
 268             if (level != 0) {
 269                 i += run;
 270                 j = scantable[i];
 271                 level = ((level * 2 + 1) * qscale) >> 1;
 272                 level = (level - 1) | 1;
 273                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
 274                 SKIP_BITS(re, &s->gb, 1);
 275             } else {
 276                 /* escape */
 277                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
 278                 UPDATE_CACHE(re, &s->gb);
 279                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
 280                 if (level == -128) {
 281                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
 282                 } else if (level == 0) {
 283                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
 284                 }
 285                 i += run;
 286                 j = scantable[i];
 287                 if (level < 0) {
 288                     level = -level;
 289                     level = ((level * 2 + 1) * qscale) >> 1;
 290                     level = (level - 1) | 1;
 291                     level = -level;
 292                 } else {
 293                     level = ((level * 2 + 1) * qscale) >> 1;
 294                     level = (level - 1) | 1;
 295                 }
 296             }
 297
 298             block[j] = level;
 299             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
 300                 break;
 301             UPDATE_CACHE(re, &s->gb);
 302         }
 303 end:
 304         LAST_SKIP_BITS(re, &s->gb, 2);
 305         CLOSE_READER(re, &s->gb);
 306     }
 307     s->block_last_index[n] = i;
 308     return 0;
 309 }
 310
 311
 312 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s, DCTELEM *block, int n)
 313 {
 314     int level, i, j, run;
 315     RLTable *rl = &ff_rl_mpeg1;
 316     uint8_t * const scantable = s->intra_scantable.permutated;
 317     const uint16_t *quant_matrix;
 318     const int qscale = s->qscale;
 319     int mismatch;
 320
 321     mismatch = 1;
 322
 323     {
 324         OPEN_READER(re, &s->gb);
 325         i = -1;
 326         if (n < 4)
 327             quant_matrix = s->inter_matrix;
 328         else
 329             quant_matrix = s->chroma_inter_matrix;
 330
 331         // special case for first coefficient, no need to add second VLC table
 332         UPDATE_CACHE(re, &s->gb);
 333         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
 334             level= (3 * qscale * quant_matrix[0]) >> 5;
 335             if (GET_CACHE(re, &s->gb) & 0x40000000)
 336                 level = -level;
 337             block[0]  = level;
 338             mismatch ^= level;
 339             i++;
 340             SKIP_BITS(re, &s->gb, 2);
 341             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
 342                 goto end;
 343         }
 344
 345         /* now quantify & encode AC coefficients */
 346         for (;;) {
 347             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
 348
 349             if (level != 0) {
 350                 i += run;
 351                 j = scantable[i];
 352                 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 353                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
 354                 SKIP_BITS(re, &s->gb, 1);
 355             } else {
 356                 /* escape */
 357                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
 358                 UPDATE_CACHE(re, &s->gb);
 359                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
 360
 361                 i += run;
 362                 j = scantable[i];
 363                 if (level < 0) {
 364                     level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 365                     level = -level;
 366                 } else {
 367                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 368                 }
 369             }
 370             if (i > 63) {
 371                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
 372                 return -1;
 373             }
 374
 375             mismatch ^= level;
 376             block[j]  = level;
 377             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
 378                 break;
 379             UPDATE_CACHE(re, &s->gb);
 380         }
 381 end:
 382         LAST_SKIP_BITS(re, &s->gb, 2);
 383         CLOSE_READER(re, &s->gb);
 384     }
 385     block[63] ^= (mismatch & 1);
 386
 387     s->block_last_index[n] = i;
 388     return 0;
 389 }
 390
 391 /**
 392  * Note: this function can read out of range and crash for corrupt streams.
 393  * Changing this would eat up any speed benefits it has.
 394  * Do not use "fast" flag if you need the code to be robust.
 395  */
 396 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
 397                                                     DCTELEM *block, int n)
 398 {
 399     int level, i, j, run;
 400     RLTable *rl = &ff_rl_mpeg1;
 401     uint8_t * const scantable = s->intra_scantable.permutated;
 402     const int qscale          = s->qscale;
 403     OPEN_READER(re, &s->gb);
 404     i = -1;
 405
 406     // special case for first coefficient, no need to add second VLC table
 407     UPDATE_CACHE(re, &s->gb);
 408     if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
 409         level = (3 * qscale) >> 1;
 410         if (GET_CACHE(re, &s->gb) & 0x40000000)
 411             level = -level;
 412         block[0] = level;
 413         i++;
 414         SKIP_BITS(re, &s->gb, 2);
 415         if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
 416             goto end;
 417     }
 418
 419     /* now quantify & encode AC coefficients */
 420     for (;;) {
 421         GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
 422
 423         if (level != 0) {
 424             i += run;
 425             j  = scantable[i];
 426             level = ((level * 2 + 1) * qscale) >> 1;
 427             level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
 428             SKIP_BITS(re, &s->gb, 1);
 429         } else {
 430             /* escape */
 431             run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
 432             UPDATE_CACHE(re, &s->gb);
 433             level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
 434
 435             i += run;
 436             j  = scantable[i];
 437             if (level < 0) {
 438                 level = ((-level * 2 + 1) * qscale) >> 1;
 439                 level = -level;
 440             } else {
 441                 level = ((level * 2 + 1) * qscale) >> 1;
 442             }
 443         }
 444
 445         block[j] = level;
 446         if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
 447             break;
 448         UPDATE_CACHE(re, &s->gb);
 449     }
 450 end:
 451     LAST_SKIP_BITS(re, &s->gb, 2);
 452     CLOSE_READER(re, &s->gb);
 453     s->block_last_index[n] = i;
 454     return 0;
 455 }
 456
 457
 458 static inline int mpeg2_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n)
 459 {
 460     int level, dc, diff, i, j, run;
 461     int component;
 462     RLTable *rl;
 463     uint8_t * const scantable = s->intra_scantable.permutated;
 464     const uint16_t *quant_matrix;
 465     const int qscale = s->qscale;
 466     int mismatch;
 467
 468     /* DC coefficient */
 469     if (n < 4) {
 470         quant_matrix = s->intra_matrix;
 471         component = 0;
 472     } else {
 473         quant_matrix = s->chroma_intra_matrix;
 474         component = (n & 1) + 1;
 475     }
 476     diff = decode_dc(&s->gb, component);
 477     if (diff >= 0xffff)
 478         return -1;
 479     dc  = s->last_dc[component];
 480     dc += diff;
 481     s->last_dc[component] = dc;
 482     block[0] = dc << (3 - s->intra_dc_precision);
 483     av_dlog(s->avctx, "dc=%d\n", block[0]);
 484     mismatch = block[0] ^ 1;
 485     i = 0;
 486     if (s->intra_vlc_format)
 487         rl = &ff_rl_mpeg2;
 488     else
 489         rl = &ff_rl_mpeg1;
 490
 491     {
 492         OPEN_READER(re, &s->gb);
 493         /* now quantify & encode AC coefficients */
 494         for (;;) {
 495             UPDATE_CACHE(re, &s->gb);
 496             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
 497
 498             if (level == 127) {
 499                 break;
 500             } else if (level != 0) {
 501                 i += run;
 502                 j  = scantable[i];
 503                 level = (level * qscale * quant_matrix[j]) >> 4;
 504                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
 505                 LAST_SKIP_BITS(re, &s->gb, 1);
 506             } else {
 507                 /* escape */
 508                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
 509                 UPDATE_CACHE(re, &s->gb);
 510                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
 511                 i += run;
 512                 j  = scantable[i];
 513                 if (level < 0) {
 514                     level = (-level * qscale * quant_matrix[j]) >> 4;
 515                     level = -level;
 516                 } else {
 517                     level = (level * qscale * quant_matrix[j]) >> 4;
 518                 }
 519             }
 520             if (i > 63) {
 521                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
 522                 return -1;
 523             }
 524
 525             mismatch ^= level;
 526             block[j]  = level;
 527         }
 528         CLOSE_READER(re, &s->gb);
 529     }
 530     block[63] ^= mismatch & 1;
 531
 532     s->block_last_index[n] = i;
 533     return 0;
 534 }
 535
 536 /**
 537  * Note: this function can read out of range and crash for corrupt streams.
 538  * Changing this would eat up any speed benefits it has.
 539  * Do not use "fast" flag if you need the code to be robust.
 540  */
 541 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n)
 542 {
 543     int level, dc, diff, j, run;
 544     int component;
 545     RLTable *rl;
 546     uint8_t * scantable = s->intra_scantable.permutated;
 547     const uint16_t *quant_matrix;
 548     const int qscale = s->qscale;
 549
 550     /* DC coefficient */
 551     if (n < 4) {
 552         quant_matrix = s->intra_matrix;
 553         component = 0;
 554     } else {
 555         quant_matrix = s->chroma_intra_matrix;
 556         component = (n & 1) + 1;
 557     }
 558     diff = decode_dc(&s->gb, component);
 559     if (diff >= 0xffff)
 560         return -1;
 561     dc = s->last_dc[component];
 562     dc += diff;
 563     s->last_dc[component] = dc;
 564     block[0] = dc << (3 - s->intra_dc_precision);
 565     if (s->intra_vlc_format)
 566         rl = &ff_rl_mpeg2;
 567     else
 568         rl = &ff_rl_mpeg1;
 569
 570     {
 571         OPEN_READER(re, &s->gb);
 572         /* now quantify & encode AC coefficients */
 573         for (;;) {
 574             UPDATE_CACHE(re, &s->gb);
 575             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
 576
 577             if (level == 127) {
 578                 break;
 579             } else if (level != 0) {
 580                 scantable += run;
 581                 j = *scantable;
 582                 level = (level * qscale * quant_matrix[j]) >> 4;
 583                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
 584                 LAST_SKIP_BITS(re, &s->gb, 1);
 585             } else {
 586                 /* escape */
 587                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
 588                 UPDATE_CACHE(re, &s->gb);
 589                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
 590                 scantable += run;
 591                 j = *scantable;
 592                 if (level < 0) {
 593                     level = (-level * qscale * quant_matrix[j]) >> 4;
 594                     level = -level;
 595                 } else {
 596                     level = (level * qscale * quant_matrix[j]) >> 4;
 597                 }
 598             }
 599
 600             block[j] = level;
 601         }
 602         CLOSE_READER(re, &s->gb);
 603     }
 604
 605     s->block_last_index[n] = scantable - s->intra_scantable.permutated;
 606     return 0;
 607 }
 608
 609 uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
 610
 611 #define INIT_2D_VLC_RL(rl, static_size)\
 612 {\
 613     static RL_VLC_ELEM rl_vlc_table[static_size];\
 614     INIT_VLC_STATIC(&rl.vlc, TEX_VLC_BITS, rl.n + 2,\
 615                     &rl.table_vlc[0][1], 4, 2,\
 616                     &rl.table_vlc[0][0], 4, 2, static_size);\
 617 \
 618     rl.rl_vlc[0] = rl_vlc_table;\
 619     init_2d_vlc_rl(&rl);\
 620 }
 621
 622 static void init_2d_vlc_rl(RLTable *rl)
 623 {
 624     int i;
 625
 626     for (i = 0; i < rl->vlc.table_size; i++) {
 627         int code = rl->vlc.table[i][0];
 628         int len  = rl->vlc.table[i][1];
 629         int level, run;
 630
 631         if (len == 0) { // illegal code
 632             run   = 65;
 633             level = MAX_LEVEL;
 634         } else if (len<0) { //more bits needed
 635             run   = 0;
 636             level = code;
 637         } else {
 638             if (code == rl->n) { //esc
 639                 run   = 65;
 640                 level = 0;
 641             } else if (code == rl->n+1) { //eob
 642                 run   = 0;
 643                 level = 127;
 644             } else {
 645                 run   = rl->table_run  [code] + 1;
 646                 level = rl->table_level[code];
 647             }
 648         }
 649         rl->rl_vlc[0][i].len   = len;
 650         rl->rl_vlc[0][i].level = level;
 651         rl->rl_vlc[0][i].run   = run;
 652     }
 653 }
 654
 655 void ff_mpeg12_common_init(MpegEncContext *s)
 656 {
 657
 658     s->y_dc_scale_table =
 659     s->c_dc_scale_table = ff_mpeg2_dc_scale_table[s->intra_dc_precision];
 660
 661 }
 662
 663 void ff_mpeg1_clean_buffers(MpegEncContext *s)
 664 {
 665     s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
 666     s->last_dc[1] = s->last_dc[0];
 667     s->last_dc[2] = s->last_dc[0];
 668     memset(s->last_mv, 0, sizeof(s->last_mv));
 669 }
 670
 671
 672 /******************************************/
 673 /* decoding */
 674
 675 VLC ff_dc_lum_vlc;
 676 VLC ff_dc_chroma_vlc;
 677
 678 static VLC mbincr_vlc;
 679 static VLC mb_ptype_vlc;
 680 static VLC mb_btype_vlc;
 681 static VLC mb_pat_vlc;
 682
 683 av_cold void ff_mpeg12_init_vlcs(void)
 684 {
 685     static int done = 0;
 686
 687     if (!done) {
 688         done = 1;
 689
 690         INIT_VLC_STATIC(&ff_dc_lum_vlc, DC_VLC_BITS, 12,
 691                         ff_mpeg12_vlc_dc_lum_bits, 1, 1,
 692                         ff_mpeg12_vlc_dc_lum_code, 2, 2, 512);
 693         INIT_VLC_STATIC(&ff_dc_chroma_vlc,  DC_VLC_BITS, 12,
 694                         ff_mpeg12_vlc_dc_chroma_bits, 1, 1,
 695                         ff_mpeg12_vlc_dc_chroma_code, 2, 2, 514);
 696         INIT_VLC_STATIC(&mv_vlc, MV_VLC_BITS, 17,
 697                         &ff_mpeg12_mbMotionVectorTable[0][1], 2, 1,
 698                         &ff_mpeg12_mbMotionVectorTable[0][0], 2, 1, 518);
 699         INIT_VLC_STATIC(&mbincr_vlc, MBINCR_VLC_BITS, 36,
 700                         &ff_mpeg12_mbAddrIncrTable[0][1], 2, 1,
 701                         &ff_mpeg12_mbAddrIncrTable[0][0], 2, 1, 538);
 702         INIT_VLC_STATIC(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
 703                         &ff_mpeg12_mbPatTable[0][1], 2, 1,
 704                         &ff_mpeg12_mbPatTable[0][0], 2, 1, 512);
 705
 706         INIT_VLC_STATIC(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
 707                         &table_mb_ptype[0][1], 2, 1,
 708                         &table_mb_ptype[0][0], 2, 1, 64);
 709         INIT_VLC_STATIC(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
 710                         &table_mb_btype[0][1], 2, 1,
 711                         &table_mb_btype[0][0], 2, 1, 64);
 712         ff_init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
 713         ff_init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
 714
 715         INIT_2D_VLC_RL(ff_rl_mpeg1, 680);
 716         INIT_2D_VLC_RL(ff_rl_mpeg2, 674);
 717     }
 718 }
 719
 720 static inline int get_dmv(MpegEncContext *s)
 721 {
 722     if (get_bits1(&s->gb))
 723         return 1 - (get_bits1(&s->gb) << 1);
 724     else
 725         return 0;
 726 }
 727
 728 static inline int get_qscale(MpegEncContext *s)
 729 {
 730     int qscale = get_bits(&s->gb, 5);
 731     if (s->q_scale_type) {
 732         return non_linear_qscale[qscale];
 733     } else {
 734         return qscale << 1;
 735     }
 736 }
 737
 738 static void exchange_uv(MpegEncContext *s)
 739 {
 740     DCTELEM (*tmp)[64];
 741
 742     tmp           = s->pblocks[4];
 743     s->pblocks[4] = s->pblocks[5];
 744     s->pblocks[5] = tmp;
 745 }
 746
 747 /* motion type (for MPEG-2) */
 748 #define MT_FIELD 1
 749 #define MT_FRAME 2
 750 #define MT_16X8  2
 751 #define MT_DMV   3
 752
 753 static int mpeg_decode_mb(MpegEncContext *s, DCTELEM block[12][64])
 754 {
 755     int i, j, k, cbp, val, mb_type, motion_type;
 756     const int mb_block_count = 4 + (1 << s->chroma_format);
 757
 758     av_dlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
 759
 760     av_assert2(s->mb_skipped == 0);
 761
 762     if (s->mb_skip_run-- != 0) {
 763         if (s->pict_type == AV_PICTURE_TYPE_P) {
 764             s->mb_skipped = 1;
 765             s->current_picture.f.mb_type[s->mb_x + s->mb_y * s->mb_stride] = MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
 766         } else {
 767             int mb_type;
 768
 769             if (s->mb_x)
 770                 mb_type = s->current_picture.f.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
 771             else
 772                 mb_type = s->current_picture.f.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1]; // FIXME not sure if this is allowed in MPEG at all
 773             if (IS_INTRA(mb_type))
 774                 return -1;
 775             s->current_picture.f.mb_type[s->mb_x + s->mb_y*s->mb_stride] =
 776                 mb_type | MB_TYPE_SKIP;
 777 //            av_assert2(s->current_picture.f.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1] & (MB_TYPE_16x16 | MB_TYPE_16x8));
 778
 779             if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
 780                 s->mb_skipped = 1;
 781         }
 782
 783         return 0;
 784     }
 785
 786     switch (s->pict_type) {
 787     default:
 788     case AV_PICTURE_TYPE_I:
 789         if (get_bits1(&s->gb) == 0) {
 790             if (get_bits1(&s->gb) == 0) {
 791                 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
 792                 return -1;
 793             }
 794             mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
 795         } else {
 796             mb_type = MB_TYPE_INTRA;
 797         }
 798         break;
 799     case AV_PICTURE_TYPE_P:
 800         mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
 801         if (mb_type < 0) {
 802             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
 803             return -1;
 804         }
 805         mb_type = ptype2mb_type[mb_type];
 806         break;
 807     case AV_PICTURE_TYPE_B:
 808         mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
 809         if (mb_type < 0) {
 810             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
 811             return -1;
 812         }
 813         mb_type = btype2mb_type[mb_type];
 814         break;
 815     }
 816     av_dlog(s->avctx, "mb_type=%x\n", mb_type);
 817 //    motion_type = 0; /* avoid warning */
 818     if (IS_INTRA(mb_type)) {
 819         s->dsp.clear_blocks(s->block[0]);
 820
 821         if (!s->chroma_y_shift) {
 822             s->dsp.clear_blocks(s->block[6]);
 823         }
 824
 825         /* compute DCT type */
 826         if (s->picture_structure == PICT_FRAME && // FIXME add an interlaced_dct coded var?
 827             !s->frame_pred_frame_dct) {
 828             s->interlaced_dct = get_bits1(&s->gb);
 829         }
 830
 831         if (IS_QUANT(mb_type))
 832             s->qscale = get_qscale(s);
 833
 834         if (s->concealment_motion_vectors) {
 835             /* just parse them */
 836             if (s->picture_structure != PICT_FRAME)
 837                 skip_bits1(&s->gb); /* field select */
 838
 839             s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
 840                 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
 841             s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
 842                 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
 843
 844             skip_bits1(&s->gb); /* marker */
 845         } else
 846             memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
 847         s->mb_intra = 1;
 848         // if 1, we memcpy blocks in xvmcvideo
 849         if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1) {
 850             ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
 851             if (s->swap_uv) {
 852                 exchange_uv(s);
 853             }
 854         }
 855
 856         if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
 857             if (s->flags2 & CODEC_FLAG2_FAST) {
 858                 for (i = 0; i < 6; i++) {
 859                     mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
 860                 }
 861             } else {
 862                 for (i = 0; i < mb_block_count; i++) {
 863                     if (mpeg2_decode_block_intra(s, *s->pblocks[i], i) < 0)
 864                         return -1;
 865                 }
 866             }
 867         } else {
 868             for (i = 0; i < 6; i++) {
 869                 if (mpeg1_decode_block_intra(s, *s->pblocks[i], i) < 0)
 870                     return -1;
 871             }
 872         }
 873     } else {
 874         if (mb_type & MB_TYPE_ZERO_MV) {
 875             av_assert2(mb_type & MB_TYPE_CBP);
 876
 877             s->mv_dir = MV_DIR_FORWARD;
 878             if (s->picture_structure == PICT_FRAME) {
 879                 if (!s->frame_pred_frame_dct)
 880                     s->interlaced_dct = get_bits1(&s->gb);
 881                 s->mv_type = MV_TYPE_16X16;
 882             } else {
 883                 s->mv_type = MV_TYPE_FIELD;
 884                 mb_type |= MB_TYPE_INTERLACED;
 885                 s->field_select[0][0] = s->picture_structure - 1;
 886             }
 887
 888             if (IS_QUANT(mb_type))
 889                 s->qscale = get_qscale(s);
 890
 891             s->last_mv[0][0][0] = 0;
 892             s->last_mv[0][0][1] = 0;
 893             s->last_mv[0][1][0] = 0;
 894             s->last_mv[0][1][1] = 0;
 895             s->mv[0][0][0] = 0;
 896             s->mv[0][0][1] = 0;
 897         } else {
 898             av_assert2(mb_type & MB_TYPE_L0L1);
 899             // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
 900             /* get additional motion vector type */
 901             if (s->frame_pred_frame_dct)
 902                 motion_type = MT_FRAME;
 903             else {
 904                 motion_type = get_bits(&s->gb, 2);
 905                 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
 906                     s->interlaced_dct = get_bits1(&s->gb);
 907             }
 908
 909             if (IS_QUANT(mb_type))
 910                 s->qscale = get_qscale(s);
 911
 912             /* motion vectors */
 913             s->mv_dir = (mb_type >> 13) & 3;
 914             av_dlog(s->avctx, "motion_type=%d\n", motion_type);
 915             switch (motion_type) {
 916             case MT_FRAME: /* or MT_16X8 */
 917                 if (s->picture_structure == PICT_FRAME) {
 918                     mb_type |= MB_TYPE_16x16;
 919                     s->mv_type = MV_TYPE_16X16;
 920                     for (i = 0; i < 2; i++) {
 921                         if (USES_LIST(mb_type, i)) {
 922                             /* MT_FRAME */
 923                             s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
 924                                 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
 925                             s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
 926                                 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
 927                             /* full_pel: only for MPEG-1 */
 928                             if (s->full_pel[i]) {
 929                                 s->mv[i][0][0] <<= 1;
 930                                 s->mv[i][0][1] <<= 1;
 931                             }
 932                         }
 933                     }
 934                 } else {
 935                     mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
 936                     s->mv_type = MV_TYPE_16X8;
 937                     for (i = 0; i < 2; i++) {
 938                         if (USES_LIST(mb_type, i)) {
 939                             /* MT_16X8 */
 940                             for (j = 0; j < 2; j++) {
 941                                 s->field_select[i][j] = get_bits1(&s->gb);
 942                                 for (k = 0; k < 2; k++) {
 943                                     val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
 944                                                              s->last_mv[i][j][k]);
 945                                     s->last_mv[i][j][k] = val;
 946                                     s->mv[i][j][k]      = val;
 947                                 }
 948                             }
 949                         }
 950                     }
 951                 }
 952                 break;
 953             case MT_FIELD:
 954                 s->mv_type = MV_TYPE_FIELD;
 955                 if (s->picture_structure == PICT_FRAME) {
 956                     mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
 957                     for (i = 0; i < 2; i++) {
 958                         if (USES_LIST(mb_type, i)) {
 959                             for (j = 0; j < 2; j++) {
 960                                 s->field_select[i][j] = get_bits1(&s->gb);
 961                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
 962                                                          s->last_mv[i][j][0]);
 963                                 s->last_mv[i][j][0] = val;
 964                                 s->mv[i][j][0]      = val;
 965                                 av_dlog(s->avctx, "fmx=%d\n", val);
 966                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
 967                                                          s->last_mv[i][j][1] >> 1);
 968                                 s->last_mv[i][j][1] = val << 1;
 969                                 s->mv[i][j][1]      = val;
 970                                 av_dlog(s->avctx, "fmy=%d\n", val);
 971                             }
 972                         }
 973                     }
 974                 } else {
 975                     av_assert0(!s->progressive_sequence);
 976                     mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
 977                     for (i = 0; i < 2; i++) {
 978                         if (USES_LIST(mb_type, i)) {
 979                             s->field_select[i][0] = get_bits1(&s->gb);
 980                             for (k = 0; k < 2; k++) {
 981                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
 982                                                          s->last_mv[i][0][k]);
 983                                 s->last_mv[i][0][k] = val;
 984                                 s->last_mv[i][1][k] = val;
 985                                 s->mv[i][0][k]      = val;
 986                             }
 987                         }
 988                     }
 989                 }
 990                 break;
 991             case MT_DMV:
 992                 if(s->progressive_sequence){
 993                     av_log(s->avctx, AV_LOG_ERROR, "MT_DMV in progressive_sequence\n");
 994                     return -1;
 995                 }
 996                 s->mv_type = MV_TYPE_DMV;
 997                 for (i = 0; i < 2; i++) {
 998                     if (USES_LIST(mb_type, i)) {
 999                         int dmx, dmy, mx, my, m;
1000                         const int my_shift = s->picture_structure == PICT_FRAME;
1001
1002                         mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1003                                                 s->last_mv[i][0][0]);
1004                         s->last_mv[i][0][0] = mx;
1005                         s->last_mv[i][1][0] = mx;
1006                         dmx = get_dmv(s);
1007                         my  = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1008                                                  s->last_mv[i][0][1] >> my_shift);
1009                         dmy = get_dmv(s);
1010
1011
1012                         s->last_mv[i][0][1] = my << my_shift;
1013                         s->last_mv[i][1][1] = my << my_shift;
1014
1015                         s->mv[i][0][0] = mx;
1016                         s->mv[i][0][1] = my;
1017                         s->mv[i][1][0] = mx; // not used
1018                         s->mv[i][1][1] = my; // not used
1019
1020                         if (s->picture_structure == PICT_FRAME) {
1021                             mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1022
1023                             // m = 1 + 2 * s->top_field_first;
1024                             m = s->top_field_first ? 1 : 3;
1025
1026                             /* top -> top pred */
1027                             s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1028                             s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1029                             m = 4 - m;
1030                             s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1031                             s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1032                         } else {
1033                             mb_type |= MB_TYPE_16x16;
1034
1035                             s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1036                             s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1037                             if (s->picture_structure == PICT_TOP_FIELD)
1038                                 s->mv[i][2][1]--;
1039                             else
1040                                 s->mv[i][2][1]++;
1041                         }
1042                     }
1043                 }
1044                 break;
1045             default:
1046                 av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
1047                 return -1;
1048             }
1049         }
1050
1051         s->mb_intra = 0;
1052         if (HAS_CBP(mb_type)) {
1053             s->dsp.clear_blocks(s->block[0]);
1054
1055             cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1056             if (mb_block_count > 6) {
1057                  cbp <<= mb_block_count - 6;
1058                  cbp  |= get_bits(&s->gb, mb_block_count - 6);
1059                  s->dsp.clear_blocks(s->block[6]);
1060             }
1061             if (cbp <= 0) {
1062                 av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
1063                 return -1;
1064             }
1065
1066             //if 1, we memcpy blocks in xvmcvideo
1067             if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1) {
1068                 ff_xvmc_pack_pblocks(s, cbp);
1069                 if (s->swap_uv) {
1070                     exchange_uv(s);
1071                 }
1072             }
1073
1074             if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
1075                 if (s->flags2 & CODEC_FLAG2_FAST) {
1076                     for (i = 0; i < 6; i++) {
1077                         if (cbp & 32) {
1078                             mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
1079                         } else {
1080                             s->block_last_index[i] = -1;
1081                         }
1082                         cbp += cbp;
1083                     }
1084                 } else {
1085                     cbp <<= 12-mb_block_count;
1086
1087                     for (i = 0; i < mb_block_count; i++) {
1088                         if (cbp & (1 << 11)) {
1089                             if (mpeg2_decode_block_non_intra(s, *s->pblocks[i], i) < 0)
1090                                 return -1;
1091                         } else {
1092                             s->block_last_index[i] = -1;
1093                         }
1094                         cbp += cbp;
1095                     }
1096                 }
1097             } else {
1098                 if (s->flags2 & CODEC_FLAG2_FAST) {
1099                     for (i = 0; i < 6; i++) {
1100                         if (cbp & 32) {
1101                             mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1102                         } else {
1103                             s->block_last_index[i] = -1;
1104                         }
1105                         cbp += cbp;
1106                     }
1107                 } else {
1108                     for (i = 0; i < 6; i++) {
1109                         if (cbp & 32) {
1110                             if (mpeg1_decode_block_inter(s, *s->pblocks[i], i) < 0)
1111                                 return -1;
1112                         } else {
1113                             s->block_last_index[i] = -1;
1114                         }
1115                         cbp += cbp;
1116                     }
1117                 }
1118             }
1119         } else {
1120             for (i = 0; i < 12; i++)
1121                 s->block_last_index[i] = -1;
1122         }
1123     }
1124
1125     s->current_picture.f.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1126
1127     return 0;
1128 }
1129
1130 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1131 {
1132     Mpeg1Context *s = avctx->priv_data;
1133     MpegEncContext *s2 = &s->mpeg_enc_ctx;
1134     int i;
1135
1136     /* we need some permutation to store matrices,
1137      * until MPV_common_init() sets the real permutation. */
1138     for (i = 0; i < 64; i++)
1139        s2->dsp.idct_permutation[i]=i;
1140
1141     ff_MPV_decode_defaults(s2);
1142
1143     s->mpeg_enc_ctx.avctx  = avctx;
1144     s->mpeg_enc_ctx.flags  = avctx->flags;
1145     s->mpeg_enc_ctx.flags2 = avctx->flags2;
1146     ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1147     ff_mpeg12_init_vlcs();
1148
1149     s->mpeg_enc_ctx_allocated      = 0;
1150     s->mpeg_enc_ctx.picture_number = 0;
1151     s->repeat_field                = 0;
1152     s->mpeg_enc_ctx.codec_id       = avctx->codec->id;
1153     avctx->color_range = AVCOL_RANGE_MPEG;
1154     if (avctx->codec->id == AV_CODEC_ID_MPEG1VIDEO)
1155         avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1156     else
1157         avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
1158     return 0;
1159 }
1160
1161 static int mpeg_decode_update_thread_context(AVCodecContext *avctx, const AVCodecContext *avctx_from)
1162 {
1163     Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1164     MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1165     int err;
1166
1167     if (avctx == avctx_from || !ctx_from->mpeg_enc_ctx_allocated || !s1->context_initialized)
1168         return 0;
1169
1170     err = ff_mpeg_update_thread_context(avctx, avctx_from);
1171     if (err) return err;
1172
1173     if (!ctx->mpeg_enc_ctx_allocated)
1174         memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1175
1176     if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1177         s->picture_number++;
1178
1179     return 0;
1180 }
1181
1182 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1183                                  const uint8_t *new_perm)
1184 {
1185     uint16_t temp_matrix[64];
1186     int i;
1187
1188     memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1189
1190     for (i = 0; i < 64; i++) {
1191         matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1192     }
1193 }
1194
1195 static const enum AVPixelFormat mpeg1_hwaccel_pixfmt_list_420[] = {
1196 #if CONFIG_MPEG_XVMC_DECODER
1197     AV_PIX_FMT_XVMC_MPEG2_IDCT,
1198     AV_PIX_FMT_XVMC_MPEG2_MC,
1199 #endif
1200 #if CONFIG_MPEG1_VDPAU_HWACCEL
1201     AV_PIX_FMT_VDPAU_MPEG1,
1202 #endif
1203     AV_PIX_FMT_YUV420P,
1204     AV_PIX_FMT_NONE
1205 };
1206
1207 static const enum AVPixelFormat mpeg2_hwaccel_pixfmt_list_420[] = {
1208 #if CONFIG_MPEG_XVMC_DECODER
1209     AV_PIX_FMT_XVMC_MPEG2_IDCT,
1210     AV_PIX_FMT_XVMC_MPEG2_MC,
1211 #endif
1212 #if CONFIG_MPEG2_VDPAU_HWACCEL
1213     AV_PIX_FMT_VDPAU_MPEG2,
1214 #endif
1215 #if CONFIG_MPEG2_DXVA2_HWACCEL
1216     AV_PIX_FMT_DXVA2_VLD,
1217 #endif
1218 #if CONFIG_MPEG2_VAAPI_HWACCEL
1219     AV_PIX_FMT_VAAPI_VLD,
1220 #endif
1221     AV_PIX_FMT_YUV420P,
1222     AV_PIX_FMT_NONE
1223 };
1224
1225 static inline int uses_vdpau(AVCodecContext *avctx) {
1226     return avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG1 || avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG2;
1227 }
1228
1229 static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
1230 {
1231     Mpeg1Context *s1 = avctx->priv_data;
1232     MpegEncContext *s = &s1->mpeg_enc_ctx;
1233
1234     if(s->chroma_format < 2) {
1235         enum AVPixelFormat res;
1236         res = avctx->get_format(avctx,
1237                                 avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO ?
1238                                 mpeg1_hwaccel_pixfmt_list_420 :
1239                                 mpeg2_hwaccel_pixfmt_list_420);
1240         if (res != AV_PIX_FMT_XVMC_MPEG2_IDCT && res != AV_PIX_FMT_XVMC_MPEG2_MC) {
1241             avctx->xvmc_acceleration = 0;
1242         } else if (!avctx->xvmc_acceleration) {
1243             avctx->xvmc_acceleration = 2;
1244         }
1245         return res;
1246     } else if(s->chroma_format == 2)
1247         return AV_PIX_FMT_YUV422P;
1248     else
1249         return AV_PIX_FMT_YUV444P;
1250 }
1251
1252 /* Call this function when we know all parameters.
1253  * It may be called in different places for MPEG-1 and MPEG-2. */
1254 static int mpeg_decode_postinit(AVCodecContext *avctx)
1255 {
1256     Mpeg1Context *s1 = avctx->priv_data;
1257     MpegEncContext *s = &s1->mpeg_enc_ctx;
1258     uint8_t old_permutation[64];
1259
1260     if ((s1->mpeg_enc_ctx_allocated == 0) ||
1261         avctx->coded_width  != s->width   ||
1262         avctx->coded_height != s->height  ||
1263         s1->save_width           != s->width                ||
1264         s1->save_height          != s->height               ||
1265         s1->save_aspect_info     != s->aspect_ratio_info    ||
1266         s1->save_progressive_seq != s->progressive_sequence ||
1267         0)
1268     {
1269
1270         if (s1->mpeg_enc_ctx_allocated) {
1271             ParseContext pc = s->parse_context;
1272             s->parse_context.buffer = 0;
1273             ff_MPV_common_end(s);
1274             s->parse_context = pc;
1275         }
1276
1277         if ((s->width == 0) || (s->height == 0))
1278             return -2;
1279
1280         avcodec_set_dimensions(avctx, s->width, s->height);
1281         if (avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->bit_rate) {
1282             avctx->rc_max_rate = s->bit_rate;
1283         } else if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && s->bit_rate &&
1284                    (s->bit_rate != 0x3FFFF*400 || s->vbv_delay != 0xFFFF)) {
1285             avctx->bit_rate = s->bit_rate;
1286         }
1287         s1->save_aspect_info     = s->aspect_ratio_info;
1288         s1->save_width           = s->width;
1289         s1->save_height          = s->height;
1290         s1->save_progressive_seq = s->progressive_sequence;
1291
1292         /* low_delay may be forced, in this case we will have B-frames
1293          * that behave like P-frames. */
1294         avctx->has_b_frames = !s->low_delay;
1295
1296         if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1297             //MPEG-1 fps
1298             avctx->time_base.den = ff_mpeg12_frame_rate_tab[s->frame_rate_index].num;
1299             avctx->time_base.num = ff_mpeg12_frame_rate_tab[s->frame_rate_index].den;
1300             //MPEG-1 aspect
1301             avctx->sample_aspect_ratio = av_d2q(1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1302             avctx->ticks_per_frame=1;
1303         } else {//MPEG-2
1304         //MPEG-2 fps
1305             av_reduce(&s->avctx->time_base.den,
1306                       &s->avctx->time_base.num,
1307                       ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num*2,
1308                       ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1309                       1 << 30);
1310             avctx->ticks_per_frame = 2;
1311             //MPEG-2 aspect
1312             if (s->aspect_ratio_info > 1) {
1313                 AVRational dar =
1314                     av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1315                                       (AVRational) {s1->pan_scan.width, s1->pan_scan.height}),
1316                              (AVRational) {s->width, s->height});
1317
1318                 // we ignore the spec here and guess a bit as reality does not match the spec, see for example
1319                 // res_change_ffmpeg_aspect.ts and sequence-display-aspect.mpg
1320                 // issue1613, 621, 562
1321                 if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1322                    (av_cmp_q(dar, (AVRational) {4, 3}) && av_cmp_q(dar, (AVRational) {16, 9}))) {
1323                     s->avctx->sample_aspect_ratio =
1324                         av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1325                                  (AVRational) {s->width, s->height});
1326                 } else {
1327                     s->avctx->sample_aspect_ratio =
1328                         av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1329                                  (AVRational) {s1->pan_scan.width, s1->pan_scan.height});
1330 //issue1613 4/3 16/9 -> 16/9
1331 //res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1332 //widescreen-issue562.mpg 4/3 16/9 -> 16/9
1333 //                    s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1334                     av_dlog(avctx, "A %d/%d\n",
1335                             ff_mpeg2_aspect[s->aspect_ratio_info].num, ff_mpeg2_aspect[s->aspect_ratio_info].den);
1336                     av_dlog(avctx, "B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1337                             s->avctx->sample_aspect_ratio.den);
1338                 }
1339             } else {
1340                 s->avctx->sample_aspect_ratio =
1341                     ff_mpeg2_aspect[s->aspect_ratio_info];
1342             }
1343         } // MPEG-2
1344
1345         avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1346         avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
1347         // until then pix_fmt may be changed right after codec init
1348         if (avctx->pix_fmt == AV_PIX_FMT_XVMC_MPEG2_IDCT ||
1349             avctx->hwaccel )
1350             if (avctx->idct_algo == FF_IDCT_AUTO)
1351                 avctx->idct_algo = FF_IDCT_SIMPLE;
1352
1353         /* Quantization matrices may need reordering
1354          * if DCT permutation is changed. */
1355         memcpy(old_permutation, s->dsp.idct_permutation, 64 * sizeof(uint8_t));
1356
1357         if (ff_MPV_common_init(s) < 0)
1358             return -2;
1359
1360         quant_matrix_rebuild(s->intra_matrix,        old_permutation, s->dsp.idct_permutation);
1361         quant_matrix_rebuild(s->inter_matrix,        old_permutation, s->dsp.idct_permutation);
1362         quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->dsp.idct_permutation);
1363         quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->dsp.idct_permutation);
1364
1365         s1->mpeg_enc_ctx_allocated = 1;
1366     }
1367     return 0;
1368 }
1369
1370 static int mpeg1_decode_picture(AVCodecContext *avctx,
1371                                 const uint8_t *buf, int buf_size)
1372 {
1373     Mpeg1Context *s1 = avctx->priv_data;
1374     MpegEncContext *s = &s1->mpeg_enc_ctx;
1375     int ref, f_code, vbv_delay;
1376
1377     init_get_bits(&s->gb, buf, buf_size*8);
1378
1379     ref = get_bits(&s->gb, 10); /* temporal ref */
1380     s->pict_type = get_bits(&s->gb, 3);
1381     if (s->pict_type == 0 || s->pict_type > 3)
1382         return -1;
1383
1384     vbv_delay = get_bits(&s->gb, 16);
1385     s->vbv_delay = vbv_delay;
1386     if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
1387         s->full_pel[0] = get_bits1(&s->gb);
1388         f_code = get_bits(&s->gb, 3);
1389         if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1390             return -1;
1391         f_code += !f_code;
1392         s->mpeg_f_code[0][0] = f_code;
1393         s->mpeg_f_code[0][1] = f_code;
1394     }
1395     if (s->pict_type == AV_PICTURE_TYPE_B) {
1396         s->full_pel[1] = get_bits1(&s->gb);
1397         f_code = get_bits(&s->gb, 3);
1398         if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1399             return -1;
1400         f_code += !f_code;
1401         s->mpeg_f_code[1][0] = f_code;
1402         s->mpeg_f_code[1][1] = f_code;
1403     }
1404     s->current_picture.f.pict_type = s->pict_type;
1405     s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1406
1407     if (avctx->debug & FF_DEBUG_PICT_INFO)
1408         av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1409
1410     s->y_dc_scale = 8;
1411     s->c_dc_scale = 8;
1412     return 0;
1413 }
1414
1415 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1416 {
1417     MpegEncContext *s= &s1->mpeg_enc_ctx;
1418     int horiz_size_ext, vert_size_ext;
1419     int bit_rate_ext;
1420
1421     skip_bits(&s->gb, 1); /* profile and level esc*/
1422     s->avctx->profile       = get_bits(&s->gb, 3);
1423     s->avctx->level         = get_bits(&s->gb, 4);
1424     s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1425     s->chroma_format        = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1426     horiz_size_ext          = get_bits(&s->gb, 2);
1427     vert_size_ext           = get_bits(&s->gb, 2);
1428     s->width  |= (horiz_size_ext << 12);
1429     s->height |= (vert_size_ext  << 12);
1430     bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1431     s->bit_rate += (bit_rate_ext << 18) * 400;
1432     skip_bits1(&s->gb); /* marker */
1433     s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1434
1435     s->low_delay = get_bits1(&s->gb);
1436     if (s->flags & CODEC_FLAG_LOW_DELAY)
1437         s->low_delay = 1;
1438
1439     s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1440     s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1441
1442     av_dlog(s->avctx, "sequence extension\n");
1443     s->codec_id      = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1444
1445     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1446         av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1447                s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
1448
1449 }
1450
1451 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1452 {
1453     MpegEncContext *s = &s1->mpeg_enc_ctx;
1454     int color_description, w, h;
1455
1456     skip_bits(&s->gb, 3); /* video format */
1457     color_description = get_bits1(&s->gb);
1458     if (color_description) {
1459         s->avctx->color_primaries = get_bits(&s->gb, 8);
1460         s->avctx->color_trc       = get_bits(&s->gb, 8);
1461         s->avctx->colorspace      = get_bits(&s->gb, 8);
1462     }
1463     w = get_bits(&s->gb, 14);
1464     skip_bits(&s->gb, 1); //marker
1465     h = get_bits(&s->gb, 14);
1466     // remaining 3 bits are zero padding
1467
1468     s1->pan_scan.width  = 16 * w;
1469     s1->pan_scan.height = 16 * h;
1470
1471     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1472         av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1473 }
1474
1475 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1476 {
1477     MpegEncContext *s = &s1->mpeg_enc_ctx;
1478     int i, nofco;
1479
1480     nofco = 1;
1481     if (s->progressive_sequence) {
1482         if (s->repeat_first_field) {
1483             nofco++;
1484             if (s->top_field_first)
1485                 nofco++;
1486         }
1487     } else {
1488         if (s->picture_structure == PICT_FRAME) {
1489             nofco++;
1490             if (s->repeat_first_field)
1491                 nofco++;
1492         }
1493     }
1494     for (i = 0; i < nofco; i++) {
1495         s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1496         skip_bits(&s->gb, 1); // marker
1497         s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1498         skip_bits(&s->gb, 1); // marker
1499     }
1500
1501     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1502         av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1503                s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1504                s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1505                s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1506 }
1507
1508 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64], uint16_t matrix1[64], int intra)
1509 {
1510     int i;
1511
1512     for (i = 0; i < 64; i++) {
1513         int j = s->dsp.idct_permutation[ff_zigzag_direct[i]];
1514         int v = get_bits(&s->gb, 8);
1515         if (v == 0) {
1516             av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1517             return -1;
1518         }
1519         if (intra && i == 0 && v != 8) {
1520             av_log(s->avctx, AV_LOG_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v);
1521             v = 8; // needed by pink.mpg / issue1046
1522         }
1523         matrix0[j] = v;
1524         if (matrix1)
1525             matrix1[j] = v;
1526     }
1527     return 0;
1528 }
1529
1530 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1531 {
1532     av_dlog(s->avctx, "matrix extension\n");
1533
1534     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1535     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1536     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, NULL           , 1);
1537     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, NULL           , 0);
1538 }
1539
1540 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1541 {
1542     MpegEncContext *s = &s1->mpeg_enc_ctx;
1543
1544     s->full_pel[0] = s->full_pel[1] = 0;
1545     s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1546     s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1547     s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1548     s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1549     if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1550         av_log(s->avctx, AV_LOG_ERROR, "Missing picture start code, guessing missing values\n");
1551         if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1552             if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1553                 s->pict_type = AV_PICTURE_TYPE_I;
1554             else
1555                 s->pict_type = AV_PICTURE_TYPE_P;
1556         } else
1557             s->pict_type = AV_PICTURE_TYPE_B;
1558         s->current_picture.f.pict_type = s->pict_type;
1559         s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1560     }
1561     s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0];
1562     s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1];
1563     s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0];
1564     s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1];
1565
1566     s->intra_dc_precision         = get_bits(&s->gb, 2);
1567     s->picture_structure          = get_bits(&s->gb, 2);
1568     s->top_field_first            = get_bits1(&s->gb);
1569     s->frame_pred_frame_dct       = get_bits1(&s->gb);
1570     s->concealment_motion_vectors = get_bits1(&s->gb);
1571     s->q_scale_type               = get_bits1(&s->gb);
1572     s->intra_vlc_format           = get_bits1(&s->gb);
1573     s->alternate_scan             = get_bits1(&s->gb);
1574     s->repeat_first_field         = get_bits1(&s->gb);
1575     s->chroma_420_type            = get_bits1(&s->gb);
1576     s->progressive_frame          = get_bits1(&s->gb);
1577
1578
1579     if (s->alternate_scan) {
1580         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1581         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1582     } else {
1583         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1584         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1585     }
1586
1587     /* composite display not parsed */
1588     av_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1589     av_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1590     av_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1591     av_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1592     av_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1593     av_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1594     av_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1595     av_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1596     av_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1597 }
1598
1599 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1600 {
1601     AVCodecContext *avctx = s->avctx;
1602     Mpeg1Context *s1 = (Mpeg1Context*)s;
1603
1604     /* start frame decoding */
1605     if (s->first_field || s->picture_structure == PICT_FRAME) {
1606         if (ff_MPV_frame_start(s, avctx) < 0)
1607             return -1;
1608
1609         ff_er_frame_start(s);
1610
1611         /* first check if we must repeat the frame */
1612         s->current_picture_ptr->f.repeat_pict = 0;
1613         if (s->repeat_first_field) {
1614             if (s->progressive_sequence) {
1615                 if (s->top_field_first)
1616                     s->current_picture_ptr->f.repeat_pict = 4;
1617                 else
1618                     s->current_picture_ptr->f.repeat_pict = 2;
1619             } else if (s->progressive_frame) {
1620                 s->current_picture_ptr->f.repeat_pict = 1;
1621             }
1622         }
1623
1624         *s->current_picture_ptr->f.pan_scan = s1->pan_scan;
1625
1626         if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1627             ff_thread_finish_setup(avctx);
1628     } else { // second field
1629         int i;
1630
1631         if (!s->current_picture_ptr) {
1632             av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1633             return -1;
1634         }
1635
1636         if (s->avctx->hwaccel &&
1637             (s->avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
1638             if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1639                 av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode first field\n");
1640         }
1641
1642         for (i = 0; i < 4; i++) {
1643             s->current_picture.f.data[i] = s->current_picture_ptr->f.data[i];
1644             if (s->picture_structure == PICT_BOTTOM_FIELD) {
1645                 s->current_picture.f.data[i] += s->current_picture_ptr->f.linesize[i];
1646             }
1647         }
1648     }
1649
1650     if (avctx->hwaccel) {
1651         if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
1652             return -1;
1653     }
1654
1655 // MPV_frame_start will call this function too,
1656 // but we need to call it on every field
1657     if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1658         if (ff_xvmc_field_start(s, avctx) < 0)
1659             return -1;
1660
1661     return 0;
1662 }
1663
1664 #define DECODE_SLICE_ERROR -1
1665 #define DECODE_SLICE_OK     0
1666
1667 /**
1668  * Decode a slice.
1669  * MpegEncContext.mb_y must be set to the MB row from the startcode.
1670  * @return DECODE_SLICE_ERROR if the slice is damaged,
1671  *         DECODE_SLICE_OK if this slice is OK
1672  */
1673 static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1674                              const uint8_t **buf, int buf_size)
1675 {
1676     AVCodecContext *avctx = s->avctx;
1677     const int lowres      = s->avctx->lowres;
1678     const int field_pic   = s->picture_structure != PICT_FRAME;
1679
1680     s->resync_mb_x =
1681     s->resync_mb_y = -1;
1682
1683     av_assert0(mb_y < s->mb_height);
1684
1685     init_get_bits(&s->gb, *buf, buf_size * 8);
1686     if(s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1687         skip_bits(&s->gb, 3);
1688
1689     ff_mpeg1_clean_buffers(s);
1690     s->interlaced_dct = 0;
1691
1692     s->qscale = get_qscale(s);
1693
1694     if (s->qscale == 0) {
1695         av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1696         return -1;
1697     }
1698
1699     /* extra slice info */
1700     while (get_bits1(&s->gb) != 0) {
1701         skip_bits(&s->gb, 8);
1702     }
1703
1704     s->mb_x = 0;
1705
1706     if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1707         skip_bits1(&s->gb);
1708     } else {
1709         while (get_bits_left(&s->gb) > 0) {
1710             int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1711             if (code < 0) {
1712                 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1713                 return -1;
1714             }
1715             if (code >= 33) {
1716                 if (code == 33) {
1717                     s->mb_x += 33;
1718                 }
1719                 /* otherwise, stuffing, nothing to do */
1720             } else {
1721                 s->mb_x += code;
1722                 break;
1723             }
1724         }
1725     }
1726
1727     if (s->mb_x >= (unsigned)s->mb_width) {
1728         av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1729         return -1;
1730     }
1731
1732     if (avctx->hwaccel) {
1733         const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1734         int start_code = -1;
1735         buf_end = avpriv_mpv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1736         if (buf_end < *buf + buf_size)
1737             buf_end -= 4;
1738         s->mb_y = mb_y;
1739         if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1740             return DECODE_SLICE_ERROR;
1741         *buf = buf_end;
1742         return DECODE_SLICE_OK;
1743     }
1744
1745     s->resync_mb_x = s->mb_x;
1746     s->resync_mb_y = s->mb_y = mb_y;
1747     s->mb_skip_run = 0;
1748     ff_init_block_index(s);
1749
1750     if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1751         if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1752              av_log(s->avctx, AV_LOG_DEBUG, "qp:%d fc:%2d%2d%2d%2d %s %s %s %s %s dc:%d pstruct:%d fdct:%d cmv:%d qtype:%d ivlc:%d rff:%d %s\n",
1753                     s->qscale, s->mpeg_f_code[0][0], s->mpeg_f_code[0][1], s->mpeg_f_code[1][0], s->mpeg_f_code[1][1],
1754                     s->pict_type == AV_PICTURE_TYPE_I ? "I" : (s->pict_type == AV_PICTURE_TYPE_P ? "P" : (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
1755                     s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1756                     s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1757                     s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1758         }
1759     }
1760
1761     for (;;) {
1762         // If 1, we memcpy blocks in xvmcvideo.
1763         if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
1764             ff_xvmc_init_block(s); // set s->block
1765
1766         if (mpeg_decode_mb(s, s->block) < 0)
1767             return -1;
1768
1769         if (s->current_picture.f.motion_val[0] && !s->encoding) { // note motion_val is normally NULL unless we want to extract the MVs
1770             const int wrap = s->b8_stride;
1771             int xy         = s->mb_x * 2 + s->mb_y * 2 * wrap;
1772             int b8_xy      = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1773             int motion_x, motion_y, dir, i;
1774
1775             for (i = 0; i < 2; i++) {
1776                 for (dir = 0; dir < 2; dir++) {
1777                     if (s->mb_intra || (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1778                         motion_x = motion_y = 0;
1779                     } else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1780                         motion_x = s->mv[dir][0][0];
1781                         motion_y = s->mv[dir][0][1];
1782                     } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
1783                         motion_x = s->mv[dir][i][0];
1784                         motion_y = s->mv[dir][i][1];
1785                     }
1786
1787                     s->current_picture.f.motion_val[dir][xy    ][0] = motion_x;
1788                     s->current_picture.f.motion_val[dir][xy    ][1] = motion_y;
1789                     s->current_picture.f.motion_val[dir][xy + 1][0] = motion_x;
1790                     s->current_picture.f.motion_val[dir][xy + 1][1] = motion_y;
1791                     s->current_picture.f.ref_index [dir][b8_xy    ] =
1792                     s->current_picture.f.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1793                     av_assert2(s->field_select[dir][i] == 0 || s->field_select[dir][i] == 1);
1794                 }
1795                 xy += wrap;
1796                 b8_xy +=2;
1797             }
1798         }
1799
1800         s->dest[0] += 16 >> lowres;
1801         s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1802         s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1803
1804         ff_MPV_decode_mb(s, s->block);
1805
1806         if (++s->mb_x >= s->mb_width) {
1807             const int mb_size = 16 >> s->avctx->lowres;
1808
1809             ff_draw_horiz_band(s, mb_size*(s->mb_y >> field_pic), mb_size);
1810             ff_MPV_report_decode_progress(s);
1811
1812             s->mb_x = 0;
1813             s->mb_y += 1 << field_pic;
1814
1815             if (s->mb_y >= s->mb_height) {
1816                 int left   = get_bits_left(&s->gb);
1817                 int is_d10 = s->chroma_format == 2 && s->pict_type == AV_PICTURE_TYPE_I && avctx->profile == 0 && avctx->level == 5
1818                              && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
1819                              && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
1820
1821                 if (left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
1822                     || ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
1823                     av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
1824                     return -1;
1825                 } else
1826                     goto eos;
1827             }
1828
1829             ff_init_block_index(s);
1830         }
1831
1832         /* skip mb handling */
1833         if (s->mb_skip_run == -1) {
1834             /* read increment again */
1835             s->mb_skip_run = 0;
1836             for (;;) {
1837                 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1838                 if (code < 0) {
1839                     av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1840                     return -1;
1841                 }
1842                 if (code >= 33) {
1843                     if (code == 33) {
1844                         s->mb_skip_run += 33;
1845                     } else if (code == 35) {
1846                         if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1847                             av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1848                             return -1;
1849                         }
1850                         goto eos; /* end of slice */
1851                     }
1852                     /* otherwise, stuffing, nothing to do */
1853                 } else {
1854                     s->mb_skip_run += code;
1855                     break;
1856                 }
1857             }
1858             if (s->mb_skip_run) {
1859                 int i;
1860                 if (s->pict_type == AV_PICTURE_TYPE_I) {
1861                     av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1862                     return -1;
1863                 }
1864
1865                 /* skip mb */
1866                 s->mb_intra = 0;
1867                 for (i = 0; i < 12; i++)
1868                     s->block_last_index[i] = -1;
1869                 if (s->picture_structure == PICT_FRAME)
1870                     s->mv_type = MV_TYPE_16X16;
1871                 else
1872                     s->mv_type = MV_TYPE_FIELD;
1873                 if (s->pict_type == AV_PICTURE_TYPE_P) {
1874                     /* if P type, zero motion vector is implied */
1875                     s->mv_dir             = MV_DIR_FORWARD;
1876                     s->mv[0][0][0]        = s->mv[0][0][1]      = 0;
1877                     s->last_mv[0][0][0]   = s->last_mv[0][0][1] = 0;
1878                     s->last_mv[0][1][0]   = s->last_mv[0][1][1] = 0;
1879                     s->field_select[0][0] = (s->picture_structure - 1) & 1;
1880                 } else {
1881                     /* if B type, reuse previous vectors and directions */
1882                     s->mv[0][0][0] = s->last_mv[0][0][0];
1883                     s->mv[0][0][1] = s->last_mv[0][0][1];
1884                     s->mv[1][0][0] = s->last_mv[1][0][0];
1885                     s->mv[1][0][1] = s->last_mv[1][0][1];
1886                 }
1887             }
1888         }
1889     }
1890 eos: // end of slice
1891     *buf += (get_bits_count(&s->gb)-1)/8;
1892     av_dlog(s, "y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1893     return 0;
1894 }
1895
1896 static int slice_decode_thread(AVCodecContext *c, void *arg)
1897 {
1898     MpegEncContext *s   = *(void**)arg;
1899     const uint8_t *buf  = s->gb.buffer;
1900     int mb_y            = s->start_mb_y;
1901     const int field_pic = s->picture_structure != PICT_FRAME;
1902
1903     s->error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
1904
1905     for (;;) {
1906         uint32_t start_code;
1907         int ret;
1908
1909         ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
1910         emms_c();
1911         av_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1912                 ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
1913                 s->start_mb_y, s->end_mb_y, s->error_count);
1914         if (ret < 0) {
1915             if (c->err_recognition & AV_EF_EXPLODE)
1916                 return ret;
1917             if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
1918                 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
1919         } else {
1920             ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_AC_END | ER_DC_END | ER_MV_END);
1921         }
1922
1923         if (s->mb_y == s->end_mb_y)
1924             return 0;
1925
1926         start_code = -1;
1927         buf = avpriv_mpv_find_start_code(buf, s->gb.buffer_end, &start_code);
1928         mb_y= start_code - SLICE_MIN_START_CODE;
1929         if(s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1930             mb_y += (*buf&0xE0)<<2;
1931         mb_y <<= field_pic;
1932         if (s->picture_structure == PICT_BOTTOM_FIELD)
1933             mb_y++;
1934         if (mb_y < 0 || mb_y >= s->end_mb_y)
1935             return -1;
1936     }
1937 }
1938
1939 /**
1940  * Handle slice ends.
1941  * @return 1 if it seems to be the last slice
1942  */
1943 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1944 {
1945     Mpeg1Context *s1 = avctx->priv_data;
1946     MpegEncContext *s = &s1->mpeg_enc_ctx;
1947
1948     if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1949         return 0;
1950
1951     if (s->avctx->hwaccel) {
1952         if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1953             av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode picture\n");
1954     }
1955
1956     if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1957         ff_xvmc_field_end(s);
1958
1959     /* end of slice reached */
1960     if (/*s->mb_y << field_pic == s->mb_height &&*/ !s->first_field && !s->first_slice) {
1961         /* end of image */
1962
1963         s->current_picture_ptr->f.qscale_type = FF_QSCALE_TYPE_MPEG2;
1964
1965         ff_er_frame_end(s);
1966
1967         ff_MPV_frame_end(s);
1968
1969         if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
1970             *pict = s->current_picture_ptr->f;
1971             ff_print_debug_info(s, pict);
1972         } else {
1973             if (avctx->active_thread_type & FF_THREAD_FRAME)
1974                 s->picture_number++;
1975             /* latency of 1 frame for I- and P-frames */
1976             /* XXX: use another variable than picture_number */
1977             if (s->last_picture_ptr != NULL) {
1978                 *pict = s->last_picture_ptr->f;
1979                  ff_print_debug_info(s, pict);
1980             }
1981         }
1982
1983         return 1;
1984     } else {
1985         return 0;
1986     }
1987 }
1988
1989 static int mpeg1_decode_sequence(AVCodecContext *avctx,
1990                                  const uint8_t *buf, int buf_size)
1991 {
1992     Mpeg1Context *s1 = avctx->priv_data;
1993     MpegEncContext *s = &s1->mpeg_enc_ctx;
1994     int width, height;
1995     int i, v, j;
1996
1997     init_get_bits(&s->gb, buf, buf_size*8);
1998
1999     width  = get_bits(&s->gb, 12);
2000     height = get_bits(&s->gb, 12);
2001     if (width <= 0 || height <= 0)
2002         return -1;
2003     s->aspect_ratio_info = get_bits(&s->gb, 4);
2004     if (s->aspect_ratio_info == 0) {
2005         av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2006         if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2007             return -1;
2008     }
2009     s->frame_rate_index = get_bits(&s->gb, 4);
2010     if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
2011         return -1;
2012     s->bit_rate = get_bits(&s->gb, 18) * 400;
2013     if (get_bits1(&s->gb) == 0) /* marker */
2014         return -1;
2015     s->width  = width;
2016     s->height = height;
2017
2018     s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2019     skip_bits(&s->gb, 1);
2020
2021     /* get matrix */
2022     if (get_bits1(&s->gb)) {
2023         load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2024     } else {
2025         for (i = 0; i < 64; i++) {
2026             j = s->dsp.idct_permutation[i];
2027             v = ff_mpeg1_default_intra_matrix[i];
2028             s->intra_matrix[j]        = v;
2029             s->chroma_intra_matrix[j] = v;
2030         }
2031     }
2032     if (get_bits1(&s->gb)) {
2033         load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2034     } else {
2035         for (i = 0; i < 64; i++) {
2036             int j = s->dsp.idct_permutation[i];
2037             v = ff_mpeg1_default_non_intra_matrix[i];
2038             s->inter_matrix[j]        = v;
2039             s->chroma_inter_matrix[j] = v;
2040         }
2041     }
2042
2043     if (show_bits(&s->gb, 23) != 0) {
2044         av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2045         return -1;
2046     }
2047
2048     /* we set MPEG-2 parameters so that it emulates MPEG-1 */
2049     s->progressive_sequence = 1;
2050     s->progressive_frame    = 1;
2051     s->picture_structure    = PICT_FRAME;
2052     s->first_field          = 0;
2053     s->frame_pred_frame_dct = 1;
2054     s->chroma_format        = 1;
2055     s->codec_id             = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2056     s->out_format           = FMT_MPEG1;
2057     s->swap_uv              = 0; // AFAIK VCR2 does not have SEQ_HEADER
2058     if (s->flags & CODEC_FLAG_LOW_DELAY)
2059         s->low_delay = 1;
2060
2061     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2062         av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2063                s->avctx->rc_buffer_size, s->bit_rate);
2064
2065     return 0;
2066 }
2067
2068 static int vcr2_init_sequence(AVCodecContext *avctx)
2069 {
2070     Mpeg1Context *s1 = avctx->priv_data;
2071     MpegEncContext *s = &s1->mpeg_enc_ctx;
2072     int i, v;
2073
2074     /* start new MPEG-1 context decoding */
2075     s->out_format = FMT_MPEG1;
2076     if (s1->mpeg_enc_ctx_allocated) {
2077         ff_MPV_common_end(s);
2078     }
2079     s->width  = avctx->coded_width;
2080     s->height = avctx->coded_height;
2081     avctx->has_b_frames = 0; // true?
2082     s->low_delay = 1;
2083
2084     avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2085     avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
2086
2087     if( avctx->pix_fmt == AV_PIX_FMT_XVMC_MPEG2_IDCT || avctx->hwaccel )
2088         if (avctx->idct_algo == FF_IDCT_AUTO)
2089             avctx->idct_algo = FF_IDCT_SIMPLE;
2090
2091     if (ff_MPV_common_init(s) < 0)
2092         return -1;
2093     s1->mpeg_enc_ctx_allocated = 1;
2094
2095     for (i = 0; i < 64; i++) {
2096         int j = s->dsp.idct_permutation[i];
2097         v = ff_mpeg1_default_intra_matrix[i];
2098         s->intra_matrix[j]        = v;
2099         s->chroma_intra_matrix[j] = v;
2100
2101         v = ff_mpeg1_default_non_intra_matrix[i];
2102         s->inter_matrix[j]        = v;
2103         s->chroma_inter_matrix[j] = v;
2104     }
2105
2106     s->progressive_sequence  = 1;
2107     s->progressive_frame     = 1;
2108     s->picture_structure     = PICT_FRAME;
2109     s->first_field           = 0;
2110     s->frame_pred_frame_dct  = 1;
2111     s->chroma_format         = 1;
2112     if (s->codec_tag == AV_RL32("BW10")) {
2113         s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2114     } else {
2115         exchange_uv(s); // common init reset pblocks, so we swap them here
2116         s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
2117         s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
2118     }
2119     s1->save_width           = s->width;
2120     s1->save_height          = s->height;
2121     s1->save_progressive_seq = s->progressive_sequence;
2122     return 0;
2123 }
2124
2125
2126 static void mpeg_decode_user_data(AVCodecContext *avctx,
2127                                   const uint8_t *p, int buf_size)
2128 {
2129     Mpeg1Context *s = avctx->priv_data;
2130     const uint8_t *buf_end = p + buf_size;
2131
2132     if(buf_size > 29){
2133         int i;
2134         for(i=0; i<20; i++)
2135             if(!memcmp(p+i, "\0TMPGEXS\0", 9)){
2136                 s->tmpgexs= 1;
2137             }
2138
2139 /*        for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i<buf_size; i++){
2140             av_log(avctx, AV_LOG_ERROR, "%c", p[i]);
2141         }
2142             av_log(avctx, AV_LOG_ERROR, "\n");*/
2143     }
2144
2145     /* we parse the DTG active format information */
2146     if (buf_end - p >= 5 &&
2147         p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2148         int flags = p[4];
2149         p += 5;
2150         if (flags & 0x80) {
2151             /* skip event id */
2152             p += 2;
2153         }
2154         if (flags & 0x40) {
2155             if (buf_end - p < 1)
2156                 return;
2157             avctx->dtg_active_format = p[0] & 0x0f;
2158         }
2159     }
2160 }
2161
2162 static void mpeg_decode_gop(AVCodecContext *avctx,
2163                             const uint8_t *buf, int buf_size)
2164 {
2165     Mpeg1Context *s1  = avctx->priv_data;
2166     MpegEncContext *s = &s1->mpeg_enc_ctx;
2167     int broken_link;
2168     int64_t tc;
2169
2170     init_get_bits(&s->gb, buf, buf_size*8);
2171
2172     tc = avctx->timecode_frame_start = get_bits(&s->gb, 25);
2173
2174     s->closed_gop = get_bits1(&s->gb);
2175     /*broken_link indicate that after editing the
2176       reference frames of the first B-Frames after GOP I-Frame
2177       are missing (open gop)*/
2178     broken_link = get_bits1(&s->gb);
2179
2180     if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2181         char tcbuf[AV_TIMECODE_STR_SIZE];
2182         av_timecode_make_mpeg_tc_string(tcbuf, tc);
2183         av_log(s->avctx, AV_LOG_DEBUG,
2184                "GOP (%s) closed_gop=%d broken_link=%d\n",
2185                tcbuf, s->closed_gop, broken_link);
2186     }
2187 }
2188 /**
2189  * Find the end of the current frame in the bitstream.
2190  * @return the position of the first byte of the next frame, or -1
2191  */
2192 int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s)
2193 {
2194     int i;
2195     uint32_t state = pc->state;
2196
2197     /* EOF considered as end of frame */
2198     if (buf_size == 0)
2199         return 0;
2200
2201 /*
2202  0  frame start         -> 1/4
2203  1  first_SEQEXT        -> 0/2
2204  2  first field start   -> 3/0
2205  3  second_SEQEXT       -> 2/0
2206  4  searching end
2207 */
2208
2209     for (i = 0; i < buf_size; i++) {
2210         av_assert1(pc->frame_start_found >= 0 && pc->frame_start_found <= 4);
2211         if (pc->frame_start_found & 1) {
2212             if (state == EXT_START_CODE && (buf[i] & 0xF0) != 0x80)
2213                 pc->frame_start_found--;
2214             else if (state == EXT_START_CODE + 2) {
2215                 if ((buf[i] & 3) == 3)
2216                     pc->frame_start_found = 0;
2217                 else
2218                     pc->frame_start_found = (pc->frame_start_found + 1) & 3;
2219             }
2220             state++;
2221         } else {
2222             i = avpriv_mpv_find_start_code(buf + i, buf + buf_size, &state) - buf - 1;
2223             if (pc->frame_start_found == 0 && state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE) {
2224                 i++;
2225                 pc->frame_start_found = 4;
2226             }
2227             if (state == SEQ_END_CODE) {
2228                 pc->frame_start_found = 0;
2229                 pc->state=-1;
2230                 return i+1;
2231             }
2232             if (pc->frame_start_found == 2 && state == SEQ_START_CODE)
2233                 pc->frame_start_found = 0;
2234             if (pc->frame_start_found  < 4 && state == EXT_START_CODE)
2235                 pc->frame_start_found++;
2236             if (pc->frame_start_found == 4 && (state & 0xFFFFFF00) == 0x100) {
2237                 if (state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE) {
2238                     pc->frame_start_found = 0;
2239                     pc->state             = -1;
2240                     return i - 3;
2241                 }
2242             }
2243             if (pc->frame_start_found == 0 && s && state == PICTURE_START_CODE) {
2244                 ff_fetch_timestamp(s, i - 3, 1);
2245             }
2246         }
2247     }
2248     pc->state = state;
2249     return END_NOT_FOUND;
2250 }
2251
2252 static int decode_chunks(AVCodecContext *avctx,
2253                          AVFrame *picture, int *got_output,
2254                          const uint8_t *buf, int buf_size)
2255 {
2256     Mpeg1Context *s = avctx->priv_data;
2257     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2258     const uint8_t *buf_ptr = buf;
2259     const uint8_t *buf_end = buf + buf_size;
2260     int ret, input_size;
2261     int last_code = 0;
2262
2263     for (;;) {
2264         /* find next start code */
2265         uint32_t start_code = -1;
2266         buf_ptr = avpriv_mpv_find_start_code(buf_ptr, buf_end, &start_code);
2267         if (start_code > 0x1ff) {
2268             if (s2->pict_type != AV_PICTURE_TYPE_B || avctx->skip_frame <= AVDISCARD_DEFAULT) {
2269                 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE)) {
2270                     int i;
2271                     av_assert0(avctx->thread_count > 1);
2272
2273                     avctx->execute(avctx, slice_decode_thread,  &s2->thread_context[0], NULL, s->slice_count, sizeof(void*));
2274                     for (i = 0; i < s->slice_count; i++)
2275                         s2->error_count += s2->thread_context[i]->error_count;
2276                 }
2277
2278                 if (CONFIG_VDPAU && uses_vdpau(avctx))
2279                     ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2280
2281
2282                 if (slice_end(avctx, picture)) {
2283                     if (s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2284                         *got_output = 1;
2285                 }
2286             }
2287             s2->pict_type = 0;
2288             return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2289         }
2290
2291         input_size = buf_end - buf_ptr;
2292
2293         if (avctx->debug & FF_DEBUG_STARTCODE) {
2294             av_log(avctx, AV_LOG_DEBUG, "%3X at %td left %d\n", start_code, buf_ptr-buf, input_size);
2295         }
2296
2297         /* prepare data for next start code */
2298         switch (start_code) {
2299         case SEQ_START_CODE:
2300             if (last_code == 0) {
2301                 mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2302                 if(buf != avctx->extradata)
2303                     s->sync=1;
2304             } else {
2305                 av_log(avctx, AV_LOG_ERROR, "ignoring SEQ_START_CODE after %X\n", last_code);
2306                 if (avctx->err_recognition & AV_EF_EXPLODE)
2307                     return AVERROR_INVALIDDATA;
2308             }
2309             break;
2310
2311         case PICTURE_START_CODE:
2312             if(s->tmpgexs){
2313                 s2->intra_dc_precision= 3;
2314                 s2->intra_matrix[0]= 1;
2315             }
2316             if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) && s->slice_count) {
2317                 int i;
2318
2319                 avctx->execute(avctx, slice_decode_thread,
2320                                s2->thread_context, NULL,
2321                                s->slice_count, sizeof(void*));
2322                 for (i = 0; i < s->slice_count; i++)
2323                     s2->error_count += s2->thread_context[i]->error_count;
2324                 s->slice_count = 0;
2325             }
2326             if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2327                 ret = mpeg_decode_postinit(avctx);
2328                 if (ret < 0) {
2329                     av_log(avctx, AV_LOG_ERROR, "mpeg_decode_postinit() failure\n");
2330                     return ret;
2331                 }
2332
2333                 /* we have a complete image: we try to decompress it */
2334                 if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2335                     s2->pict_type = 0;
2336                 s2->first_slice = 1;
2337                 last_code = PICTURE_START_CODE;
2338             } else {
2339                 av_log(avctx, AV_LOG_ERROR, "ignoring pic after %X\n", last_code);
2340                 if (avctx->err_recognition & AV_EF_EXPLODE)
2341                     return AVERROR_INVALIDDATA;
2342             }
2343             break;
2344         case EXT_START_CODE:
2345             init_get_bits(&s2->gb, buf_ptr, input_size*8);
2346
2347             switch (get_bits(&s2->gb, 4)) {
2348             case 0x1:
2349                 if (last_code == 0) {
2350                 mpeg_decode_sequence_extension(s);
2351                 } else {
2352                     av_log(avctx, AV_LOG_ERROR, "ignoring seq ext after %X\n", last_code);
2353                     if (avctx->err_recognition & AV_EF_EXPLODE)
2354                         return AVERROR_INVALIDDATA;
2355                 }
2356                 break;
2357             case 0x2:
2358                 mpeg_decode_sequence_display_extension(s);
2359                 break;
2360             case 0x3:
2361                 mpeg_decode_quant_matrix_extension(s2);
2362                 break;
2363             case 0x7:
2364                 mpeg_decode_picture_display_extension(s);
2365                 break;
2366             case 0x8:
2367                 if (last_code == PICTURE_START_CODE) {
2368                     mpeg_decode_picture_coding_extension(s);
2369                 } else {
2370                     av_log(avctx, AV_LOG_ERROR, "ignoring pic cod ext after %X\n", last_code);
2371                     if (avctx->err_recognition & AV_EF_EXPLODE)
2372                         return AVERROR_INVALIDDATA;
2373                 }
2374                 break;
2375             }
2376             break;
2377         case USER_START_CODE:
2378             mpeg_decode_user_data(avctx, buf_ptr, input_size);
2379             break;
2380         case GOP_START_CODE:
2381             if (last_code == 0) {
2382                 s2->first_field=0;
2383                 mpeg_decode_gop(avctx, buf_ptr, input_size);
2384                 s->sync=1;
2385             } else {
2386                 av_log(avctx, AV_LOG_ERROR, "ignoring GOP_START_CODE after %X\n", last_code);
2387                 if (avctx->err_recognition & AV_EF_EXPLODE)
2388                     return AVERROR_INVALIDDATA;
2389             }
2390             break;
2391         default:
2392             if (start_code >= SLICE_MIN_START_CODE &&
2393                 start_code <= SLICE_MAX_START_CODE && last_code == PICTURE_START_CODE) {
2394
2395                 if (s2->progressive_sequence && !s2->progressive_frame) {
2396                     s2->progressive_frame = 1;
2397                     av_log(s2->avctx, AV_LOG_ERROR, "interlaced frame in progressive sequence, ignoring\n");
2398                 }
2399
2400                 if (s2->picture_structure == 0 || (s2->progressive_frame && s2->picture_structure != PICT_FRAME)) {
2401                     av_log(s2->avctx, AV_LOG_ERROR, "picture_structure %d invalid, ignoring\n", s2->picture_structure);
2402                     s2->picture_structure = PICT_FRAME;
2403                 }
2404
2405                 if (s2->progressive_sequence && !s2->frame_pred_frame_dct) {
2406                     av_log(s2->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
2407                 }
2408
2409                 if (s2->picture_structure == PICT_FRAME) {
2410                     s2->first_field = 0;
2411                     s2->v_edge_pos  = 16 * s2->mb_height;
2412                 } else {
2413                     s2->first_field ^= 1;
2414                     s2->v_edge_pos   = 8 * s2->mb_height;
2415                     memset(s2->mbskip_table, 0, s2->mb_stride * s2->mb_height);
2416                 }
2417             }
2418             if (start_code >= SLICE_MIN_START_CODE &&
2419                 start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2420                 const int field_pic = s2->picture_structure != PICT_FRAME;
2421                 int mb_y = start_code - SLICE_MIN_START_CODE;
2422                 last_code = SLICE_MIN_START_CODE;
2423                 if(s2->codec_id != AV_CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
2424                     mb_y += (*buf_ptr&0xE0)<<2;
2425
2426                 mb_y <<= field_pic;
2427                 if (s2->picture_structure == PICT_BOTTOM_FIELD)
2428                     mb_y++;
2429
2430                 if (mb_y >= s2->mb_height) {
2431                     av_log(s2->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2432                     return -1;
2433                 }
2434
2435                 if (s2->last_picture_ptr == NULL) {
2436                 /* Skip B-frames if we do not have reference frames and gop is not closed */
2437                     if (s2->pict_type == AV_PICTURE_TYPE_B) {
2438                         if (!s2->closed_gop)
2439                             break;
2440                     }
2441                 }
2442                 if (s2->pict_type == AV_PICTURE_TYPE_I || (s2->flags2 & CODEC_FLAG2_SHOW_ALL))
2443                     s->sync=1;
2444                 if (s2->next_picture_ptr == NULL) {
2445                 /* Skip P-frames if we do not have a reference frame or we have an invalid header. */
2446                     if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) break;
2447                 }
2448                 if ((avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type == AV_PICTURE_TYPE_B) ||
2449                     (avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type != AV_PICTURE_TYPE_I) ||
2450                      avctx->skip_frame >= AVDISCARD_ALL)
2451                     break;
2452
2453                 if (!s->mpeg_enc_ctx_allocated)
2454                     break;
2455
2456                 if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2457                     if (mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
2458                         break;
2459                 }
2460
2461                 if (!s2->pict_type) {
2462                     av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2463                     if (avctx->err_recognition & AV_EF_EXPLODE)
2464                         return AVERROR_INVALIDDATA;
2465                     break;
2466                 }
2467
2468                 if (s2->first_slice) {
2469                     s2->first_slice = 0;
2470                     if (mpeg_field_start(s2, buf, buf_size) < 0)
2471                         return -1;
2472                 }
2473                 if (!s2->current_picture_ptr) {
2474                     av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
2475                     return AVERROR_INVALIDDATA;
2476                 }
2477
2478                 if (uses_vdpau(avctx)) {
2479                     s->slice_count++;
2480                     break;
2481                 }
2482
2483                 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE)) {
2484                     int threshold = (s2->mb_height * s->slice_count +
2485                                      s2->slice_context_count / 2) /
2486                                     s2->slice_context_count;
2487                     av_assert0(avctx->thread_count > 1);
2488                     if (threshold <= mb_y) {
2489                         MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2490
2491                         thread_context->start_mb_y = mb_y;
2492                         thread_context->end_mb_y   = s2->mb_height;
2493                         if (s->slice_count) {
2494                             s2->thread_context[s->slice_count-1]->end_mb_y = mb_y;
2495                             ret = ff_update_duplicate_context(thread_context,
2496                                                               s2);
2497                             if (ret < 0)
2498                                 return ret;
2499                         }
2500                         init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2501                         s->slice_count++;
2502                     }
2503                     buf_ptr += 2; // FIXME add minimum number of bytes per slice
2504                 } else {
2505                     ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2506                     emms_c();
2507
2508                     if (ret < 0) {
2509                         if (avctx->err_recognition & AV_EF_EXPLODE)
2510                             return ret;
2511                         if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2512                             ff_er_add_slice(s2, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x, s2->mb_y, ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2513                     } else {
2514                         ff_er_add_slice(s2, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x-1, s2->mb_y, ER_AC_END | ER_DC_END | ER_MV_END);
2515                     }
2516                 }
2517             }
2518             break;
2519         }
2520     }
2521 }
2522
2523 static int mpeg_decode_frame(AVCodecContext *avctx,
2524                              void *data, int *got_output,
2525                              AVPacket *avpkt)
2526 {
2527     const uint8_t *buf = avpkt->data;
2528     int ret;
2529     int buf_size = avpkt->size;
2530     Mpeg1Context *s = avctx->priv_data;
2531     AVFrame *picture = data;
2532     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2533     av_dlog(avctx, "fill_buffer\n");
2534
2535     if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2536         /* special case for last picture */
2537         if (s2->low_delay == 0 && s2->next_picture_ptr) {
2538             *picture = s2->next_picture_ptr->f;
2539             s2->next_picture_ptr = NULL;
2540
2541             *got_output = 1;
2542         }
2543         return buf_size;
2544     }
2545
2546     if (s2->flags & CODEC_FLAG_TRUNCATED) {
2547         int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size, NULL);
2548
2549         if (ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0)
2550             return buf_size;
2551     }
2552
2553     s2->codec_tag = avpriv_toupper4(avctx->codec_tag);
2554     if (s->mpeg_enc_ctx_allocated == 0 && (   s2->codec_tag == AV_RL32("VCR2")
2555                                            || s2->codec_tag == AV_RL32("BW10")
2556                                           ))
2557         vcr2_init_sequence(avctx);
2558
2559     s->slice_count = 0;
2560
2561     if (avctx->extradata && !s->extradata_decoded) {
2562         ret = decode_chunks(avctx, picture, got_output, avctx->extradata, avctx->extradata_size);
2563         if(*got_output) {
2564             av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
2565             *got_output = 0;
2566         }
2567         s->extradata_decoded = 1;
2568         if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) {
2569             s2->current_picture_ptr = NULL;
2570             return ret;
2571         }
2572     }
2573
2574     ret = decode_chunks(avctx, picture, got_output, buf, buf_size);
2575     if (ret<0 || *got_output)
2576         s2->current_picture_ptr = NULL;
2577
2578     return ret;
2579 }
2580
2581
2582 static void flush(AVCodecContext *avctx)
2583 {
2584     Mpeg1Context *s = avctx->priv_data;
2585
2586     s->sync=0;
2587
2588     ff_mpeg_flush(avctx);
2589 }
2590
2591 static int mpeg_decode_end(AVCodecContext *avctx)
2592 {
2593     Mpeg1Context *s = avctx->priv_data;
2594
2595     if (s->mpeg_enc_ctx_allocated)
2596         ff_MPV_common_end(&s->mpeg_enc_ctx);
2597     return 0;
2598 }
2599
2600 static const AVProfile mpeg2_video_profiles[] = {
2601     { FF_PROFILE_MPEG2_422,          "4:2:2"              },
2602     { FF_PROFILE_MPEG2_HIGH,         "High"               },
2603     { FF_PROFILE_MPEG2_SS,           "Spatially Scalable" },
2604     { FF_PROFILE_MPEG2_SNR_SCALABLE, "SNR Scalable"       },
2605     { FF_PROFILE_MPEG2_MAIN,         "Main"               },
2606     { FF_PROFILE_MPEG2_SIMPLE,       "Simple"             },
2607     { FF_PROFILE_RESERVED,           "Reserved"           },
2608     { FF_PROFILE_RESERVED,           "Reserved"           },
2609     { FF_PROFILE_UNKNOWN },
2610 };
2611
2612
2613 AVCodec ff_mpeg1video_decoder = {
2614     .name                  = "mpeg1video",
2615     .type                  = AVMEDIA_TYPE_VIDEO,
2616     .id                    = AV_CODEC_ID_MPEG1VIDEO,
2617     .priv_data_size        = sizeof(Mpeg1Context),
2618     .init                  = mpeg_decode_init,
2619     .close                 = mpeg_decode_end,
2620     .decode                = mpeg_decode_frame,
2621     .capabilities          = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2622                              CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2623                              CODEC_CAP_SLICE_THREADS,
2624     .flush                 = flush,
2625     .max_lowres            = 3,
2626     .long_name             = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2627     .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context)
2628 };
2629
2630 AVCodec ff_mpeg2video_decoder = {
2631     .name           = "mpeg2video",
2632     .type           = AVMEDIA_TYPE_VIDEO,
2633     .id             = AV_CODEC_ID_MPEG2VIDEO,
2634     .priv_data_size = sizeof(Mpeg1Context),
2635     .init           = mpeg_decode_init,
2636     .close          = mpeg_decode_end,
2637     .decode         = mpeg_decode_frame,
2638     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2639                       CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2640                       CODEC_CAP_SLICE_THREADS,
2641     .flush          = flush,
2642     .max_lowres     = 3,
2643     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2644     .profiles       = NULL_IF_CONFIG_SMALL(mpeg2_video_profiles),
2645 };
2646
2647 //legacy decoder
2648 AVCodec ff_mpegvideo_decoder = {
2649     .name           = "mpegvideo",
2650     .type           = AVMEDIA_TYPE_VIDEO,
2651     .id             = AV_CODEC_ID_MPEG2VIDEO,
2652     .priv_data_size = sizeof(Mpeg1Context),
2653     .init           = mpeg_decode_init,
2654     .close          = mpeg_decode_end,
2655     .decode         = mpeg_decode_frame,
2656     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
2657     .flush          = flush,
2658     .max_lowres     = 3,
2659     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2660 };
2661
2662 #if CONFIG_MPEG_XVMC_DECODER
2663 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx)
2664 {
2665     if (avctx->active_thread_type & FF_THREAD_SLICE)
2666         return -1;
2667     if (!(avctx->slice_flags & SLICE_FLAG_CODED_ORDER))
2668         return -1;
2669     if (!(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
2670         av_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2671     }
2672     mpeg_decode_init(avctx);
2673
2674     avctx->pix_fmt           = AV_PIX_FMT_XVMC_MPEG2_IDCT;
2675     avctx->xvmc_acceleration = 2; // 2 - the blocks are packed!
2676
2677     return 0;
2678 }
2679
2680 AVCodec ff_mpeg_xvmc_decoder = {
2681     .name           = "mpegvideo_xvmc",
2682     .type           = AVMEDIA_TYPE_VIDEO,
2683     .id             = AV_CODEC_ID_MPEG2VIDEO_XVMC,
2684     .priv_data_size = sizeof(Mpeg1Context),
2685     .init           = mpeg_mc_decode_init,
2686     .close          = mpeg_decode_end,
2687     .decode         = mpeg_decode_frame,
2688     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2689                       CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2690     .flush          = flush,
2691     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2692 };
2693
2694 #endif
2695
2696 #if CONFIG_MPEG_VDPAU_DECODER
2697 AVCodec ff_mpeg_vdpau_decoder = {
2698     .name           = "mpegvideo_vdpau",
2699     .type           = AVMEDIA_TYPE_VIDEO,
2700     .id             = AV_CODEC_ID_MPEG2VIDEO,
2701     .priv_data_size = sizeof(Mpeg1Context),
2702     .init           = mpeg_decode_init,
2703     .close          = mpeg_decode_end,
2704     .decode         = mpeg_decode_frame,
2705     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2706                       CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2707     .flush          = flush,
2708     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2709 };
2710 #endif
2711
2712 #if CONFIG_MPEG1_VDPAU_DECODER
2713 AVCodec ff_mpeg1_vdpau_decoder = {
2714     .name           = "mpeg1video_vdpau",
2715     .type           = AVMEDIA_TYPE_VIDEO,
2716     .id             = AV_CODEC_ID_MPEG1VIDEO,
2717     .priv_data_size = sizeof(Mpeg1Context),
2718     .init           = mpeg_decode_init,
2719     .close          = mpeg_decode_end,
2720     .decode         = mpeg_decode_frame,
2721     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2722                       CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2723     .flush          = flush,
2724     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
2725 };
2726 #endif