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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, int16_t *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, int16_t *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, int16_t *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, int16_t *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, int16_t *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                                                     int16_t *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, int16_t *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, int16_t *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     int16_t (*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, int16_t 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                 av_log(s->avctx, AV_LOG_ERROR, "skip with previntra\n");
 775                 return -1;
 776             }
 777             s->current_picture.f.mb_type[s->mb_x + s->mb_y*s->mb_stride] =
 778                 mb_type | MB_TYPE_SKIP;
 779 //            av_assert2(s->current_picture.f.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1] & (MB_TYPE_16x16 | MB_TYPE_16x8));
 780
 781             if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
 782                 s->mb_skipped = 1;
 783         }
 784
 785         return 0;
 786     }
 787
 788     switch (s->pict_type) {
 789     default:
 790     case AV_PICTURE_TYPE_I:
 791         if (get_bits1(&s->gb) == 0) {
 792             if (get_bits1(&s->gb) == 0) {
 793                 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
 794                 return -1;
 795             }
 796             mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
 797         } else {
 798             mb_type = MB_TYPE_INTRA;
 799         }
 800         break;
 801     case AV_PICTURE_TYPE_P:
 802         mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
 803         if (mb_type < 0) {
 804             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
 805             return -1;
 806         }
 807         mb_type = ptype2mb_type[mb_type];
 808         break;
 809     case AV_PICTURE_TYPE_B:
 810         mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
 811         if (mb_type < 0) {
 812             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
 813             return -1;
 814         }
 815         mb_type = btype2mb_type[mb_type];
 816         break;
 817     }
 818     av_dlog(s->avctx, "mb_type=%x\n", mb_type);
 819 //    motion_type = 0; /* avoid warning */
 820     if (IS_INTRA(mb_type)) {
 821         s->dsp.clear_blocks(s->block[0]);
 822
 823         if (!s->chroma_y_shift) {
 824             s->dsp.clear_blocks(s->block[6]);
 825         }
 826
 827         /* compute DCT type */
 828         if (s->picture_structure == PICT_FRAME && // FIXME add an interlaced_dct coded var?
 829             !s->frame_pred_frame_dct) {
 830             s->interlaced_dct = get_bits1(&s->gb);
 831         }
 832
 833         if (IS_QUANT(mb_type))
 834             s->qscale = get_qscale(s);
 835
 836         if (s->concealment_motion_vectors) {
 837             /* just parse them */
 838             if (s->picture_structure != PICT_FRAME)
 839                 skip_bits1(&s->gb); /* field select */
 840
 841             s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
 842                 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
 843             s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
 844                 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
 845
 846             skip_bits1(&s->gb); /* marker */
 847         } else
 848             memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
 849         s->mb_intra = 1;
 850         // if 1, we memcpy blocks in xvmcvideo
 851         if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1) {
 852             ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
 853             if (s->swap_uv) {
 854                 exchange_uv(s);
 855             }
 856         }
 857
 858         if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
 859             if (s->flags2 & CODEC_FLAG2_FAST) {
 860                 for (i = 0; i < 6; i++) {
 861                     mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
 862                 }
 863             } else {
 864                 for (i = 0; i < mb_block_count; i++) {
 865                     if (mpeg2_decode_block_intra(s, *s->pblocks[i], i) < 0)
 866                         return -1;
 867                 }
 868             }
 869         } else {
 870             for (i = 0; i < 6; i++) {
 871                 if (mpeg1_decode_block_intra(s, *s->pblocks[i], i) < 0)
 872                     return -1;
 873             }
 874         }
 875     } else {
 876         if (mb_type & MB_TYPE_ZERO_MV) {
 877             av_assert2(mb_type & MB_TYPE_CBP);
 878
 879             s->mv_dir = MV_DIR_FORWARD;
 880             if (s->picture_structure == PICT_FRAME) {
 881                 if (s->picture_structure == PICT_FRAME
 882                     && !s->frame_pred_frame_dct)
 883                     s->interlaced_dct = get_bits1(&s->gb);
 884                 s->mv_type = MV_TYPE_16X16;
 885             } else {
 886                 s->mv_type = MV_TYPE_FIELD;
 887                 mb_type |= MB_TYPE_INTERLACED;
 888                 s->field_select[0][0] = s->picture_structure - 1;
 889             }
 890
 891             if (IS_QUANT(mb_type))
 892                 s->qscale = get_qscale(s);
 893
 894             s->last_mv[0][0][0] = 0;
 895             s->last_mv[0][0][1] = 0;
 896             s->last_mv[0][1][0] = 0;
 897             s->last_mv[0][1][1] = 0;
 898             s->mv[0][0][0] = 0;
 899             s->mv[0][0][1] = 0;
 900         } else {
 901             av_assert2(mb_type & MB_TYPE_L0L1);
 902             // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
 903             /* get additional motion vector type */
 904             if (s->picture_structure == PICT_FRAME && s->frame_pred_frame_dct)
 905                 motion_type = MT_FRAME;
 906             else {
 907                 motion_type = get_bits(&s->gb, 2);
 908                 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
 909                     s->interlaced_dct = get_bits1(&s->gb);
 910             }
 911
 912             if (IS_QUANT(mb_type))
 913                 s->qscale = get_qscale(s);
 914
 915             /* motion vectors */
 916             s->mv_dir = (mb_type >> 13) & 3;
 917             av_dlog(s->avctx, "motion_type=%d\n", motion_type);
 918             switch (motion_type) {
 919             case MT_FRAME: /* or MT_16X8 */
 920                 if (s->picture_structure == PICT_FRAME) {
 921                     mb_type |= MB_TYPE_16x16;
 922                     s->mv_type = MV_TYPE_16X16;
 923                     for (i = 0; i < 2; i++) {
 924                         if (USES_LIST(mb_type, i)) {
 925                             /* MT_FRAME */
 926                             s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
 927                                 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
 928                             s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
 929                                 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
 930                             /* full_pel: only for MPEG-1 */
 931                             if (s->full_pel[i]) {
 932                                 s->mv[i][0][0] <<= 1;
 933                                 s->mv[i][0][1] <<= 1;
 934                             }
 935                         }
 936                     }
 937                 } else {
 938                     mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
 939                     s->mv_type = MV_TYPE_16X8;
 940                     for (i = 0; i < 2; i++) {
 941                         if (USES_LIST(mb_type, i)) {
 942                             /* MT_16X8 */
 943                             for (j = 0; j < 2; j++) {
 944                                 s->field_select[i][j] = get_bits1(&s->gb);
 945                                 for (k = 0; k < 2; k++) {
 946                                     val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
 947                                                              s->last_mv[i][j][k]);
 948                                     s->last_mv[i][j][k] = val;
 949                                     s->mv[i][j][k]      = val;
 950                                 }
 951                             }
 952                         }
 953                     }
 954                 }
 955                 break;
 956             case MT_FIELD:
 957                 s->mv_type = MV_TYPE_FIELD;
 958                 if (s->picture_structure == PICT_FRAME) {
 959                     mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
 960                     for (i = 0; i < 2; i++) {
 961                         if (USES_LIST(mb_type, i)) {
 962                             for (j = 0; j < 2; j++) {
 963                                 s->field_select[i][j] = get_bits1(&s->gb);
 964                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
 965                                                          s->last_mv[i][j][0]);
 966                                 s->last_mv[i][j][0] = val;
 967                                 s->mv[i][j][0]      = val;
 968                                 av_dlog(s->avctx, "fmx=%d\n", val);
 969                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
 970                                                          s->last_mv[i][j][1] >> 1);
 971                                 s->last_mv[i][j][1] = val << 1;
 972                                 s->mv[i][j][1]      = val;
 973                                 av_dlog(s->avctx, "fmy=%d\n", val);
 974                             }
 975                         }
 976                     }
 977                 } else {
 978                     av_assert0(!s->progressive_sequence);
 979                     mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
 980                     for (i = 0; i < 2; i++) {
 981                         if (USES_LIST(mb_type, i)) {
 982                             s->field_select[i][0] = get_bits1(&s->gb);
 983                             for (k = 0; k < 2; k++) {
 984                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
 985                                                          s->last_mv[i][0][k]);
 986                                 s->last_mv[i][0][k] = val;
 987                                 s->last_mv[i][1][k] = val;
 988                                 s->mv[i][0][k]      = val;
 989                             }
 990                         }
 991                     }
 992                 }
 993                 break;
 994             case MT_DMV:
 995                 if(s->progressive_sequence){
 996                     av_log(s->avctx, AV_LOG_ERROR, "MT_DMV in progressive_sequence\n");
 997                     return -1;
 998                 }
 999                 s->mv_type = MV_TYPE_DMV;
1000                 for (i = 0; i < 2; i++) {
1001                     if (USES_LIST(mb_type, i)) {
1002                         int dmx, dmy, mx, my, m;
1003                         const int my_shift = s->picture_structure == PICT_FRAME;
1004
1005                         mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
1006                                                 s->last_mv[i][0][0]);
1007                         s->last_mv[i][0][0] = mx;
1008                         s->last_mv[i][1][0] = mx;
1009                         dmx = get_dmv(s);
1010                         my  = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1011                                                  s->last_mv[i][0][1] >> my_shift);
1012                         dmy = get_dmv(s);
1013
1014
1015                         s->last_mv[i][0][1] = my << my_shift;
1016                         s->last_mv[i][1][1] = my << my_shift;
1017
1018                         s->mv[i][0][0] = mx;
1019                         s->mv[i][0][1] = my;
1020                         s->mv[i][1][0] = mx; // not used
1021                         s->mv[i][1][1] = my; // not used
1022
1023                         if (s->picture_structure == PICT_FRAME) {
1024                             mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1025
1026                             // m = 1 + 2 * s->top_field_first;
1027                             m = s->top_field_first ? 1 : 3;
1028
1029                             /* top -> top pred */
1030                             s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1031                             s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1032                             m = 4 - m;
1033                             s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1034                             s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1035                         } else {
1036                             mb_type |= MB_TYPE_16x16;
1037
1038                             s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1039                             s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1040                             if (s->picture_structure == PICT_TOP_FIELD)
1041                                 s->mv[i][2][1]--;
1042                             else
1043                                 s->mv[i][2][1]++;
1044                         }
1045                     }
1046                 }
1047                 break;
1048             default:
1049                 av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
1050                 return -1;
1051             }
1052         }
1053
1054         s->mb_intra = 0;
1055         if (HAS_CBP(mb_type)) {
1056             s->dsp.clear_blocks(s->block[0]);
1057
1058             cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1059             if (mb_block_count > 6) {
1060                  cbp <<= mb_block_count - 6;
1061                  cbp  |= get_bits(&s->gb, mb_block_count - 6);
1062                  s->dsp.clear_blocks(s->block[6]);
1063             }
1064             if (cbp <= 0) {
1065                 av_log(s->avctx, AV_LOG_ERROR, "invalid cbp %d at %d %d\n", cbp, s->mb_x, s->mb_y);
1066                 return -1;
1067             }
1068
1069             //if 1, we memcpy blocks in xvmcvideo
1070             if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1) {
1071                 ff_xvmc_pack_pblocks(s, cbp);
1072                 if (s->swap_uv) {
1073                     exchange_uv(s);
1074                 }
1075             }
1076
1077             if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
1078                 if (s->flags2 & CODEC_FLAG2_FAST) {
1079                     for (i = 0; i < 6; i++) {
1080                         if (cbp & 32) {
1081                             mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
1082                         } else {
1083                             s->block_last_index[i] = -1;
1084                         }
1085                         cbp += cbp;
1086                     }
1087                 } else {
1088                     cbp <<= 12-mb_block_count;
1089
1090                     for (i = 0; i < mb_block_count; i++) {
1091                         if (cbp & (1 << 11)) {
1092                             if (mpeg2_decode_block_non_intra(s, *s->pblocks[i], i) < 0)
1093                                 return -1;
1094                         } else {
1095                             s->block_last_index[i] = -1;
1096                         }
1097                         cbp += cbp;
1098                     }
1099                 }
1100             } else {
1101                 if (s->flags2 & CODEC_FLAG2_FAST) {
1102                     for (i = 0; i < 6; i++) {
1103                         if (cbp & 32) {
1104                             mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1105                         } else {
1106                             s->block_last_index[i] = -1;
1107                         }
1108                         cbp += cbp;
1109                     }
1110                 } else {
1111                     for (i = 0; i < 6; i++) {
1112                         if (cbp & 32) {
1113                             if (mpeg1_decode_block_inter(s, *s->pblocks[i], i) < 0)
1114                                 return -1;
1115                         } else {
1116                             s->block_last_index[i] = -1;
1117                         }
1118                         cbp += cbp;
1119                     }
1120                 }
1121             }
1122         } else {
1123             for (i = 0; i < 12; i++)
1124                 s->block_last_index[i] = -1;
1125         }
1126     }
1127
1128     s->current_picture.f.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1129
1130     return 0;
1131 }
1132
1133 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1134 {
1135     Mpeg1Context *s = avctx->priv_data;
1136     MpegEncContext *s2 = &s->mpeg_enc_ctx;
1137     int i;
1138
1139     /* we need some permutation to store matrices,
1140      * until MPV_common_init() sets the real permutation. */
1141     for (i = 0; i < 64; i++)
1142        s2->dsp.idct_permutation[i]=i;
1143
1144     ff_MPV_decode_defaults(s2);
1145
1146     s->mpeg_enc_ctx.avctx  = avctx;
1147     s->mpeg_enc_ctx.flags  = avctx->flags;
1148     s->mpeg_enc_ctx.flags2 = avctx->flags2;
1149     ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1150     ff_mpeg12_init_vlcs();
1151
1152     s->mpeg_enc_ctx_allocated      = 0;
1153     s->mpeg_enc_ctx.picture_number = 0;
1154     s->repeat_field                = 0;
1155     s->mpeg_enc_ctx.codec_id       = avctx->codec->id;
1156     avctx->color_range = AVCOL_RANGE_MPEG;
1157     if (avctx->codec->id == AV_CODEC_ID_MPEG1VIDEO)
1158         avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1159     else
1160         avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
1161     return 0;
1162 }
1163
1164 static int mpeg_decode_update_thread_context(AVCodecContext *avctx, const AVCodecContext *avctx_from)
1165 {
1166     Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1167     MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1168     int err;
1169
1170     if (avctx == avctx_from || !ctx_from->mpeg_enc_ctx_allocated || !s1->context_initialized)
1171         return 0;
1172
1173     err = ff_mpeg_update_thread_context(avctx, avctx_from);
1174     if (err) return err;
1175
1176     if (!ctx->mpeg_enc_ctx_allocated)
1177         memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1178
1179     if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1180         s->picture_number++;
1181
1182     return 0;
1183 }
1184
1185 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1186                                  const uint8_t *new_perm)
1187 {
1188     uint16_t temp_matrix[64];
1189     int i;
1190
1191     memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1192
1193     for (i = 0; i < 64; i++) {
1194         matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1195     }
1196 }
1197
1198 static const enum AVPixelFormat mpeg1_hwaccel_pixfmt_list_420[] = {
1199 #if CONFIG_MPEG_XVMC_DECODER
1200     AV_PIX_FMT_XVMC_MPEG2_IDCT,
1201     AV_PIX_FMT_XVMC_MPEG2_MC,
1202 #endif
1203 #if CONFIG_MPEG1_VDPAU_HWACCEL
1204     AV_PIX_FMT_VDPAU_MPEG1,
1205 #endif
1206     AV_PIX_FMT_YUV420P,
1207     AV_PIX_FMT_NONE
1208 };
1209
1210 static const enum AVPixelFormat mpeg2_hwaccel_pixfmt_list_420[] = {
1211 #if CONFIG_MPEG_XVMC_DECODER
1212     AV_PIX_FMT_XVMC_MPEG2_IDCT,
1213     AV_PIX_FMT_XVMC_MPEG2_MC,
1214 #endif
1215 #if CONFIG_MPEG2_VDPAU_HWACCEL
1216     AV_PIX_FMT_VDPAU_MPEG2,
1217 #endif
1218 #if CONFIG_MPEG2_DXVA2_HWACCEL
1219     AV_PIX_FMT_DXVA2_VLD,
1220 #endif
1221 #if CONFIG_MPEG2_VAAPI_HWACCEL
1222     AV_PIX_FMT_VAAPI_VLD,
1223 #endif
1224     AV_PIX_FMT_YUV420P,
1225     AV_PIX_FMT_NONE
1226 };
1227
1228 static inline int uses_vdpau(AVCodecContext *avctx) {
1229     return avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG1 || avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG2;
1230 }
1231
1232 static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
1233 {
1234     Mpeg1Context *s1 = avctx->priv_data;
1235     MpegEncContext *s = &s1->mpeg_enc_ctx;
1236
1237     if(s->chroma_format < 2) {
1238         enum AVPixelFormat res;
1239         res = avctx->get_format(avctx,
1240                                 avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO ?
1241                                 mpeg1_hwaccel_pixfmt_list_420 :
1242                                 mpeg2_hwaccel_pixfmt_list_420);
1243         if (res != AV_PIX_FMT_XVMC_MPEG2_IDCT && res != AV_PIX_FMT_XVMC_MPEG2_MC) {
1244             avctx->xvmc_acceleration = 0;
1245         } else if (!avctx->xvmc_acceleration) {
1246             avctx->xvmc_acceleration = 2;
1247         }
1248         return res;
1249     } else if(s->chroma_format == 2)
1250         return AV_PIX_FMT_YUV422P;
1251     else
1252         return AV_PIX_FMT_YUV444P;
1253 }
1254
1255 /* Call this function when we know all parameters.
1256  * It may be called in different places for MPEG-1 and MPEG-2. */
1257 static int mpeg_decode_postinit(AVCodecContext *avctx)
1258 {
1259     Mpeg1Context *s1 = avctx->priv_data;
1260     MpegEncContext *s = &s1->mpeg_enc_ctx;
1261     uint8_t old_permutation[64];
1262
1263     if ((s1->mpeg_enc_ctx_allocated == 0) ||
1264         avctx->coded_width  != s->width   ||
1265         avctx->coded_height != s->height  ||
1266         s1->save_width           != s->width                ||
1267         s1->save_height          != s->height               ||
1268         s1->save_aspect_info     != s->aspect_ratio_info    ||
1269         s1->save_progressive_seq != s->progressive_sequence ||
1270         0)
1271     {
1272
1273         if (s1->mpeg_enc_ctx_allocated) {
1274             ParseContext pc = s->parse_context;
1275             s->parse_context.buffer = 0;
1276             ff_MPV_common_end(s);
1277             s->parse_context = pc;
1278         }
1279
1280         if ((s->width == 0) || (s->height == 0))
1281             return -2;
1282
1283         avcodec_set_dimensions(avctx, s->width, s->height);
1284         if (avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->bit_rate) {
1285             avctx->rc_max_rate = s->bit_rate;
1286         } else if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && s->bit_rate &&
1287                    (s->bit_rate != 0x3FFFF*400 || s->vbv_delay != 0xFFFF)) {
1288             avctx->bit_rate = s->bit_rate;
1289         }
1290         s1->save_aspect_info     = s->aspect_ratio_info;
1291         s1->save_width           = s->width;
1292         s1->save_height          = s->height;
1293         s1->save_progressive_seq = s->progressive_sequence;
1294
1295         /* low_delay may be forced, in this case we will have B-frames
1296          * that behave like P-frames. */
1297         avctx->has_b_frames = !s->low_delay;
1298
1299         if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1300             //MPEG-1 fps
1301             avctx->time_base.den = ff_mpeg12_frame_rate_tab[s->frame_rate_index].num;
1302             avctx->time_base.num = ff_mpeg12_frame_rate_tab[s->frame_rate_index].den;
1303             //MPEG-1 aspect
1304             avctx->sample_aspect_ratio = av_d2q(1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1305             avctx->ticks_per_frame=1;
1306         } else {//MPEG-2
1307         //MPEG-2 fps
1308             av_reduce(&s->avctx->time_base.den,
1309                       &s->avctx->time_base.num,
1310                       ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num*2,
1311                       ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1312                       1 << 30);
1313             avctx->ticks_per_frame = 2;
1314             //MPEG-2 aspect
1315             if (s->aspect_ratio_info > 1) {
1316                 AVRational dar =
1317                     av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1318                                       (AVRational) {s1->pan_scan.width, s1->pan_scan.height}),
1319                              (AVRational) {s->width, s->height});
1320
1321                 // we ignore the spec here and guess a bit as reality does not match the spec, see for example
1322                 // res_change_ffmpeg_aspect.ts and sequence-display-aspect.mpg
1323                 // issue1613, 621, 562
1324                 if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1325                    (av_cmp_q(dar, (AVRational) {4, 3}) && av_cmp_q(dar, (AVRational) {16, 9}))) {
1326                     s->avctx->sample_aspect_ratio =
1327                         av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1328                                  (AVRational) {s->width, s->height});
1329                 } else {
1330                     s->avctx->sample_aspect_ratio =
1331                         av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1332                                  (AVRational) {s1->pan_scan.width, s1->pan_scan.height});
1333 //issue1613 4/3 16/9 -> 16/9
1334 //res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1335 //widescreen-issue562.mpg 4/3 16/9 -> 16/9
1336 //                    s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1337                     av_dlog(avctx, "A %d/%d\n",
1338                             ff_mpeg2_aspect[s->aspect_ratio_info].num, ff_mpeg2_aspect[s->aspect_ratio_info].den);
1339                     av_dlog(avctx, "B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1340                             s->avctx->sample_aspect_ratio.den);
1341                 }
1342             } else {
1343                 s->avctx->sample_aspect_ratio =
1344                     ff_mpeg2_aspect[s->aspect_ratio_info];
1345             }
1346         } // MPEG-2
1347
1348         avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1349         avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
1350         // until then pix_fmt may be changed right after codec init
1351         if (avctx->pix_fmt == AV_PIX_FMT_XVMC_MPEG2_IDCT ||
1352             avctx->hwaccel )
1353             if (avctx->idct_algo == FF_IDCT_AUTO)
1354                 avctx->idct_algo = FF_IDCT_SIMPLE;
1355
1356         /* Quantization matrices may need reordering
1357          * if DCT permutation is changed. */
1358         memcpy(old_permutation, s->dsp.idct_permutation, 64 * sizeof(uint8_t));
1359
1360         if (ff_MPV_common_init(s) < 0)
1361             return -2;
1362
1363         quant_matrix_rebuild(s->intra_matrix,        old_permutation, s->dsp.idct_permutation);
1364         quant_matrix_rebuild(s->inter_matrix,        old_permutation, s->dsp.idct_permutation);
1365         quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->dsp.idct_permutation);
1366         quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->dsp.idct_permutation);
1367
1368         s1->mpeg_enc_ctx_allocated = 1;
1369     }
1370     return 0;
1371 }
1372
1373 static int mpeg1_decode_picture(AVCodecContext *avctx,
1374                                 const uint8_t *buf, int buf_size)
1375 {
1376     Mpeg1Context *s1 = avctx->priv_data;
1377     MpegEncContext *s = &s1->mpeg_enc_ctx;
1378     int ref, f_code, vbv_delay;
1379
1380     init_get_bits(&s->gb, buf, buf_size*8);
1381
1382     ref = get_bits(&s->gb, 10); /* temporal ref */
1383     s->pict_type = get_bits(&s->gb, 3);
1384     if (s->pict_type == 0 || s->pict_type > 3)
1385         return -1;
1386
1387     vbv_delay = get_bits(&s->gb, 16);
1388     s->vbv_delay = vbv_delay;
1389     if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
1390         s->full_pel[0] = get_bits1(&s->gb);
1391         f_code = get_bits(&s->gb, 3);
1392         if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1393             return -1;
1394         f_code += !f_code;
1395         s->mpeg_f_code[0][0] = f_code;
1396         s->mpeg_f_code[0][1] = f_code;
1397     }
1398     if (s->pict_type == AV_PICTURE_TYPE_B) {
1399         s->full_pel[1] = get_bits1(&s->gb);
1400         f_code = get_bits(&s->gb, 3);
1401         if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1402             return -1;
1403         f_code += !f_code;
1404         s->mpeg_f_code[1][0] = f_code;
1405         s->mpeg_f_code[1][1] = f_code;
1406     }
1407     s->current_picture.f.pict_type = s->pict_type;
1408     s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1409
1410     if (avctx->debug & FF_DEBUG_PICT_INFO)
1411         av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1412
1413     s->y_dc_scale = 8;
1414     s->c_dc_scale = 8;
1415     return 0;
1416 }
1417
1418 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1419 {
1420     MpegEncContext *s= &s1->mpeg_enc_ctx;
1421     int horiz_size_ext, vert_size_ext;
1422     int bit_rate_ext;
1423
1424     skip_bits(&s->gb, 1); /* profile and level esc*/
1425     s->avctx->profile       = get_bits(&s->gb, 3);
1426     s->avctx->level         = get_bits(&s->gb, 4);
1427     s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1428     s->chroma_format        = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1429     horiz_size_ext          = get_bits(&s->gb, 2);
1430     vert_size_ext           = get_bits(&s->gb, 2);
1431     s->width  |= (horiz_size_ext << 12);
1432     s->height |= (vert_size_ext  << 12);
1433     bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1434     s->bit_rate += (bit_rate_ext << 18) * 400;
1435     skip_bits1(&s->gb); /* marker */
1436     s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1437
1438     s->low_delay = get_bits1(&s->gb);
1439     if (s->flags & CODEC_FLAG_LOW_DELAY)
1440         s->low_delay = 1;
1441
1442     s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1443     s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1444
1445     av_dlog(s->avctx, "sequence extension\n");
1446     s->codec_id      = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1447
1448     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1449         av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1450                s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
1451
1452 }
1453
1454 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1455 {
1456     MpegEncContext *s = &s1->mpeg_enc_ctx;
1457     int color_description, w, h;
1458
1459     skip_bits(&s->gb, 3); /* video format */
1460     color_description = get_bits1(&s->gb);
1461     if (color_description) {
1462         s->avctx->color_primaries = get_bits(&s->gb, 8);
1463         s->avctx->color_trc       = get_bits(&s->gb, 8);
1464         s->avctx->colorspace      = get_bits(&s->gb, 8);
1465     }
1466     w = get_bits(&s->gb, 14);
1467     skip_bits(&s->gb, 1); //marker
1468     h = get_bits(&s->gb, 14);
1469     // remaining 3 bits are zero padding
1470
1471     s1->pan_scan.width  = 16 * w;
1472     s1->pan_scan.height = 16 * h;
1473
1474     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1475         av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1476 }
1477
1478 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1479 {
1480     MpegEncContext *s = &s1->mpeg_enc_ctx;
1481     int i, nofco;
1482
1483     nofco = 1;
1484     if (s->progressive_sequence) {
1485         if (s->repeat_first_field) {
1486             nofco++;
1487             if (s->top_field_first)
1488                 nofco++;
1489         }
1490     } else {
1491         if (s->picture_structure == PICT_FRAME) {
1492             nofco++;
1493             if (s->repeat_first_field)
1494                 nofco++;
1495         }
1496     }
1497     for (i = 0; i < nofco; i++) {
1498         s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1499         skip_bits(&s->gb, 1); // marker
1500         s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1501         skip_bits(&s->gb, 1); // marker
1502     }
1503
1504     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1505         av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1506                s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1507                s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1508                s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1509 }
1510
1511 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64], uint16_t matrix1[64], int intra)
1512 {
1513     int i;
1514
1515     for (i = 0; i < 64; i++) {
1516         int j = s->dsp.idct_permutation[ff_zigzag_direct[i]];
1517         int v = get_bits(&s->gb, 8);
1518         if (v == 0) {
1519             av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1520             return -1;
1521         }
1522         if (intra && i == 0 && v != 8) {
1523             av_log(s->avctx, AV_LOG_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v);
1524             v = 8; // needed by pink.mpg / issue1046
1525         }
1526         matrix0[j] = v;
1527         if (matrix1)
1528             matrix1[j] = v;
1529     }
1530     return 0;
1531 }
1532
1533 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1534 {
1535     av_dlog(s->avctx, "matrix extension\n");
1536
1537     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1538     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1539     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, NULL           , 1);
1540     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, NULL           , 0);
1541 }
1542
1543 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1544 {
1545     MpegEncContext *s = &s1->mpeg_enc_ctx;
1546
1547     s->full_pel[0] = s->full_pel[1] = 0;
1548     s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1549     s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1550     s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1551     s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1552     if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1553         av_log(s->avctx, AV_LOG_ERROR, "Missing picture start code, guessing missing values\n");
1554         if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1555             if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1556                 s->pict_type = AV_PICTURE_TYPE_I;
1557             else
1558                 s->pict_type = AV_PICTURE_TYPE_P;
1559         } else
1560             s->pict_type = AV_PICTURE_TYPE_B;
1561         s->current_picture.f.pict_type = s->pict_type;
1562         s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1563     }
1564     s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0];
1565     s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1];
1566     s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0];
1567     s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1];
1568
1569     s->intra_dc_precision         = get_bits(&s->gb, 2);
1570     s->picture_structure          = get_bits(&s->gb, 2);
1571     s->top_field_first            = get_bits1(&s->gb);
1572     s->frame_pred_frame_dct       = get_bits1(&s->gb);
1573     s->concealment_motion_vectors = get_bits1(&s->gb);
1574     s->q_scale_type               = get_bits1(&s->gb);
1575     s->intra_vlc_format           = get_bits1(&s->gb);
1576     s->alternate_scan             = get_bits1(&s->gb);
1577     s->repeat_first_field         = get_bits1(&s->gb);
1578     s->chroma_420_type            = get_bits1(&s->gb);
1579     s->progressive_frame          = get_bits1(&s->gb);
1580
1581
1582     if (s->alternate_scan) {
1583         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1584         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1585     } else {
1586         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1587         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1588     }
1589
1590     /* composite display not parsed */
1591     av_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1592     av_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1593     av_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1594     av_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1595     av_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1596     av_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1597     av_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1598     av_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1599     av_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1600 }
1601
1602 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1603 {
1604     AVCodecContext *avctx = s->avctx;
1605     Mpeg1Context *s1 = (Mpeg1Context*)s;
1606
1607     /* start frame decoding */
1608     if (s->first_field || s->picture_structure == PICT_FRAME) {
1609         if (ff_MPV_frame_start(s, avctx) < 0)
1610             return -1;
1611
1612         ff_er_frame_start(s);
1613
1614         /* first check if we must repeat the frame */
1615         s->current_picture_ptr->f.repeat_pict = 0;
1616         if (s->repeat_first_field) {
1617             if (s->progressive_sequence) {
1618                 if (s->top_field_first)
1619                     s->current_picture_ptr->f.repeat_pict = 4;
1620                 else
1621                     s->current_picture_ptr->f.repeat_pict = 2;
1622             } else if (s->progressive_frame) {
1623                 s->current_picture_ptr->f.repeat_pict = 1;
1624             }
1625         }
1626
1627         *s->current_picture_ptr->f.pan_scan = s1->pan_scan;
1628
1629         if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1630             ff_thread_finish_setup(avctx);
1631     } else { // second field
1632         int i;
1633
1634         if (!s->current_picture_ptr) {
1635             av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1636             return -1;
1637         }
1638
1639         if (s->avctx->hwaccel &&
1640             (s->avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
1641             if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1642                 av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode first field\n");
1643         }
1644
1645         for (i = 0; i < 4; i++) {
1646             s->current_picture.f.data[i] = s->current_picture_ptr->f.data[i];
1647             if (s->picture_structure == PICT_BOTTOM_FIELD) {
1648                 s->current_picture.f.data[i] += s->current_picture_ptr->f.linesize[i];
1649             }
1650         }
1651     }
1652
1653     if (avctx->hwaccel) {
1654         if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
1655             return -1;
1656     }
1657
1658 // MPV_frame_start will call this function too,
1659 // but we need to call it on every field
1660     if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1661         if (ff_xvmc_field_start(s, avctx) < 0)
1662             return -1;
1663
1664     return 0;
1665 }
1666
1667 #define DECODE_SLICE_ERROR -1
1668 #define DECODE_SLICE_OK     0
1669
1670 /**
1671  * Decode a slice.
1672  * MpegEncContext.mb_y must be set to the MB row from the startcode.
1673  * @return DECODE_SLICE_ERROR if the slice is damaged,
1674  *         DECODE_SLICE_OK if this slice is OK
1675  */
1676 static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1677                              const uint8_t **buf, int buf_size)
1678 {
1679     AVCodecContext *avctx = s->avctx;
1680     const int lowres      = s->avctx->lowres;
1681     const int field_pic   = s->picture_structure != PICT_FRAME;
1682
1683     s->resync_mb_x =
1684     s->resync_mb_y = -1;
1685
1686     av_assert0(mb_y < s->mb_height);
1687
1688     init_get_bits(&s->gb, *buf, buf_size * 8);
1689     if(s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1690         skip_bits(&s->gb, 3);
1691
1692     ff_mpeg1_clean_buffers(s);
1693     s->interlaced_dct = 0;
1694
1695     s->qscale = get_qscale(s);
1696
1697     if (s->qscale == 0) {
1698         av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1699         return -1;
1700     }
1701
1702     /* extra slice info */
1703     while (get_bits1(&s->gb) != 0) {
1704         skip_bits(&s->gb, 8);
1705     }
1706
1707     s->mb_x = 0;
1708
1709     if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1710         skip_bits1(&s->gb);
1711     } else {
1712         while (get_bits_left(&s->gb) > 0) {
1713             int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1714             if (code < 0) {
1715                 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1716                 return -1;
1717             }
1718             if (code >= 33) {
1719                 if (code == 33) {
1720                     s->mb_x += 33;
1721                 }
1722                 /* otherwise, stuffing, nothing to do */
1723             } else {
1724                 s->mb_x += code;
1725                 break;
1726             }
1727         }
1728     }
1729
1730     if (s->mb_x >= (unsigned)s->mb_width) {
1731         av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1732         return -1;
1733     }
1734
1735     if (avctx->hwaccel) {
1736         const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1737         int start_code = -1;
1738         buf_end = avpriv_mpv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1739         if (buf_end < *buf + buf_size)
1740             buf_end -= 4;
1741         s->mb_y = mb_y;
1742         if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1743             return DECODE_SLICE_ERROR;
1744         *buf = buf_end;
1745         return DECODE_SLICE_OK;
1746     }
1747
1748     s->resync_mb_x = s->mb_x;
1749     s->resync_mb_y = s->mb_y = mb_y;
1750     s->mb_skip_run = 0;
1751     ff_init_block_index(s);
1752
1753     if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1754         if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1755              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",
1756                     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],
1757                     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")),
1758                     s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1759                     s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1760                     s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1761         }
1762     }
1763
1764     for (;;) {
1765         // If 1, we memcpy blocks in xvmcvideo.
1766         if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
1767             ff_xvmc_init_block(s); // set s->block
1768
1769         if (mpeg_decode_mb(s, s->block) < 0)
1770             return -1;
1771
1772         if (s->current_picture.f.motion_val[0] && !s->encoding) { // note motion_val is normally NULL unless we want to extract the MVs
1773             const int wrap = s->b8_stride;
1774             int xy         = s->mb_x * 2 + s->mb_y * 2 * wrap;
1775             int b8_xy      = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1776             int motion_x, motion_y, dir, i;
1777
1778             for (i = 0; i < 2; i++) {
1779                 for (dir = 0; dir < 2; dir++) {
1780                     if (s->mb_intra || (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1781                         motion_x = motion_y = 0;
1782                     } else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1783                         motion_x = s->mv[dir][0][0];
1784                         motion_y = s->mv[dir][0][1];
1785                     } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
1786                         motion_x = s->mv[dir][i][0];
1787                         motion_y = s->mv[dir][i][1];
1788                     }
1789
1790                     s->current_picture.f.motion_val[dir][xy    ][0] = motion_x;
1791                     s->current_picture.f.motion_val[dir][xy    ][1] = motion_y;
1792                     s->current_picture.f.motion_val[dir][xy + 1][0] = motion_x;
1793                     s->current_picture.f.motion_val[dir][xy + 1][1] = motion_y;
1794                     s->current_picture.f.ref_index [dir][b8_xy    ] =
1795                     s->current_picture.f.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1796                     av_assert2(s->field_select[dir][i] == 0 || s->field_select[dir][i] == 1);
1797                 }
1798                 xy += wrap;
1799                 b8_xy +=2;
1800             }
1801         }
1802
1803         s->dest[0] += 16 >> lowres;
1804         s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1805         s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1806
1807         ff_MPV_decode_mb(s, s->block);
1808
1809         if (++s->mb_x >= s->mb_width) {
1810             const int mb_size = 16 >> s->avctx->lowres;
1811
1812             ff_draw_horiz_band(s, mb_size*(s->mb_y >> field_pic), mb_size);
1813             ff_MPV_report_decode_progress(s);
1814
1815             s->mb_x = 0;
1816             s->mb_y += 1 << field_pic;
1817
1818             if (s->mb_y >= s->mb_height) {
1819                 int left   = get_bits_left(&s->gb);
1820                 int is_d10 = s->chroma_format == 2 && s->pict_type == AV_PICTURE_TYPE_I && avctx->profile == 0 && avctx->level == 5
1821                              && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
1822                              && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
1823
1824                 if (left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
1825                     || ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
1826                     av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
1827                     return -1;
1828                 } else
1829                     goto eos;
1830             }
1831
1832             ff_init_block_index(s);
1833         }
1834
1835         /* skip mb handling */
1836         if (s->mb_skip_run == -1) {
1837             /* read increment again */
1838             s->mb_skip_run = 0;
1839             for (;;) {
1840                 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1841                 if (code < 0) {
1842                     av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1843                     return -1;
1844                 }
1845                 if (code >= 33) {
1846                     if (code == 33) {
1847                         s->mb_skip_run += 33;
1848                     } else if (code == 35) {
1849                         if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1850                             av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1851                             return -1;
1852                         }
1853                         goto eos; /* end of slice */
1854                     }
1855                     /* otherwise, stuffing, nothing to do */
1856                 } else {
1857                     s->mb_skip_run += code;
1858                     break;
1859                 }
1860             }
1861             if (s->mb_skip_run) {
1862                 int i;
1863                 if (s->pict_type == AV_PICTURE_TYPE_I) {
1864                     av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1865                     return -1;
1866                 }
1867
1868                 /* skip mb */
1869                 s->mb_intra = 0;
1870                 for (i = 0; i < 12; i++)
1871                     s->block_last_index[i] = -1;
1872                 if (s->picture_structure == PICT_FRAME)
1873                     s->mv_type = MV_TYPE_16X16;
1874                 else
1875                     s->mv_type = MV_TYPE_FIELD;
1876                 if (s->pict_type == AV_PICTURE_TYPE_P) {
1877                     /* if P type, zero motion vector is implied */
1878                     s->mv_dir             = MV_DIR_FORWARD;
1879                     s->mv[0][0][0]        = s->mv[0][0][1]      = 0;
1880                     s->last_mv[0][0][0]   = s->last_mv[0][0][1] = 0;
1881                     s->last_mv[0][1][0]   = s->last_mv[0][1][1] = 0;
1882                     s->field_select[0][0] = (s->picture_structure - 1) & 1;
1883                 } else {
1884                     /* if B type, reuse previous vectors and directions */
1885                     s->mv[0][0][0] = s->last_mv[0][0][0];
1886                     s->mv[0][0][1] = s->last_mv[0][0][1];
1887                     s->mv[1][0][0] = s->last_mv[1][0][0];
1888                     s->mv[1][0][1] = s->last_mv[1][0][1];
1889                 }
1890             }
1891         }
1892     }
1893 eos: // end of slice
1894     *buf += (get_bits_count(&s->gb)-1)/8;
1895     av_dlog(s, "y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1896     return 0;
1897 }
1898
1899 static int slice_decode_thread(AVCodecContext *c, void *arg)
1900 {
1901     MpegEncContext *s   = *(void**)arg;
1902     const uint8_t *buf  = s->gb.buffer;
1903     int mb_y            = s->start_mb_y;
1904     const int field_pic = s->picture_structure != PICT_FRAME;
1905
1906     s->error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
1907
1908     for (;;) {
1909         uint32_t start_code;
1910         int ret;
1911
1912         ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
1913         emms_c();
1914         av_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1915                 ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
1916                 s->start_mb_y, s->end_mb_y, s->error_count);
1917         if (ret < 0) {
1918             if (c->err_recognition & AV_EF_EXPLODE)
1919                 return ret;
1920             if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
1921                 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);
1922         } else {
1923             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);
1924         }
1925
1926         if (s->mb_y == s->end_mb_y)
1927             return 0;
1928
1929         start_code = -1;
1930         buf = avpriv_mpv_find_start_code(buf, s->gb.buffer_end, &start_code);
1931         mb_y= start_code - SLICE_MIN_START_CODE;
1932         if(s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1933             mb_y += (*buf&0xE0)<<2;
1934         mb_y <<= field_pic;
1935         if (s->picture_structure == PICT_BOTTOM_FIELD)
1936             mb_y++;
1937         if (mb_y < 0 || mb_y >= s->end_mb_y)
1938             return -1;
1939     }
1940 }
1941
1942 /**
1943  * Handle slice ends.
1944  * @return 1 if it seems to be the last slice
1945  */
1946 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1947 {
1948     Mpeg1Context *s1 = avctx->priv_data;
1949     MpegEncContext *s = &s1->mpeg_enc_ctx;
1950
1951     if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1952         return 0;
1953
1954     if (s->avctx->hwaccel) {
1955         if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1956             av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode picture\n");
1957     }
1958
1959     if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1960         ff_xvmc_field_end(s);
1961
1962     /* end of slice reached */
1963     if (/*s->mb_y << field_pic == s->mb_height &&*/ !s->first_field && !s->first_slice) {
1964         /* end of image */
1965
1966         s->current_picture_ptr->f.qscale_type = FF_QSCALE_TYPE_MPEG2;
1967
1968         ff_er_frame_end(s);
1969
1970         ff_MPV_frame_end(s);
1971
1972         if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
1973             *pict = s->current_picture_ptr->f;
1974             ff_print_debug_info(s, pict);
1975         } else {
1976             if (avctx->active_thread_type & FF_THREAD_FRAME)
1977                 s->picture_number++;
1978             /* latency of 1 frame for I- and P-frames */
1979             /* XXX: use another variable than picture_number */
1980             if (s->last_picture_ptr != NULL) {
1981                 *pict = s->last_picture_ptr->f;
1982                  ff_print_debug_info(s, pict);
1983             }
1984         }
1985
1986         return 1;
1987     } else {
1988         return 0;
1989     }
1990 }
1991
1992 static int mpeg1_decode_sequence(AVCodecContext *avctx,
1993                                  const uint8_t *buf, int buf_size)
1994 {
1995     Mpeg1Context *s1 = avctx->priv_data;
1996     MpegEncContext *s = &s1->mpeg_enc_ctx;
1997     int width, height;
1998     int i, v, j;
1999
2000     init_get_bits(&s->gb, buf, buf_size*8);
2001
2002     width  = get_bits(&s->gb, 12);
2003     height = get_bits(&s->gb, 12);
2004     s->aspect_ratio_info = get_bits(&s->gb, 4);
2005     if (s->aspect_ratio_info == 0) {
2006         av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2007         if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2008             return -1;
2009     }
2010     s->frame_rate_index = get_bits(&s->gb, 4);
2011     if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
2012         return -1;
2013     s->bit_rate = get_bits(&s->gb, 18) * 400;
2014     if (get_bits1(&s->gb) == 0) /* marker */
2015         return -1;
2016     s->width  = width;
2017     s->height = height;
2018
2019     s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2020     skip_bits(&s->gb, 1);
2021
2022     /* get matrix */
2023     if (get_bits1(&s->gb)) {
2024         load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2025     } else {
2026         for (i = 0; i < 64; i++) {
2027             j = s->dsp.idct_permutation[i];
2028             v = ff_mpeg1_default_intra_matrix[i];
2029             s->intra_matrix[j]        = v;
2030             s->chroma_intra_matrix[j] = v;
2031         }
2032     }
2033     if (get_bits1(&s->gb)) {
2034         load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2035     } else {
2036         for (i = 0; i < 64; i++) {
2037             int j = s->dsp.idct_permutation[i];
2038             v = ff_mpeg1_default_non_intra_matrix[i];
2039             s->inter_matrix[j]        = v;
2040             s->chroma_inter_matrix[j] = v;
2041         }
2042     }
2043
2044     if (show_bits(&s->gb, 23) != 0) {
2045         av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2046         return -1;
2047     }
2048
2049     /* we set MPEG-2 parameters so that it emulates MPEG-1 */
2050     s->progressive_sequence = 1;
2051     s->progressive_frame    = 1;
2052     s->picture_structure    = PICT_FRAME;
2053     s->first_field          = 0;
2054     s->frame_pred_frame_dct = 1;
2055     s->chroma_format        = 1;
2056     s->codec_id             = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2057     s->out_format           = FMT_MPEG1;
2058     s->swap_uv              = 0; // AFAIK VCR2 does not have SEQ_HEADER
2059     if (s->flags & CODEC_FLAG_LOW_DELAY)
2060         s->low_delay = 1;
2061
2062     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2063         av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2064                s->avctx->rc_buffer_size, s->bit_rate);
2065
2066     return 0;
2067 }
2068
2069 static int vcr2_init_sequence(AVCodecContext *avctx)
2070 {
2071     Mpeg1Context *s1 = avctx->priv_data;
2072     MpegEncContext *s = &s1->mpeg_enc_ctx;
2073     int i, v;
2074
2075     /* start new MPEG-1 context decoding */
2076     s->out_format = FMT_MPEG1;
2077     if (s1->mpeg_enc_ctx_allocated) {
2078         ff_MPV_common_end(s);
2079     }
2080     s->width  = avctx->coded_width;
2081     s->height = avctx->coded_height;
2082     avctx->has_b_frames = 0; // true?
2083     s->low_delay = 1;
2084
2085     avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2086     avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
2087
2088     if( avctx->pix_fmt == AV_PIX_FMT_XVMC_MPEG2_IDCT || avctx->hwaccel )
2089         if (avctx->idct_algo == FF_IDCT_AUTO)
2090             avctx->idct_algo = FF_IDCT_SIMPLE;
2091
2092     if (ff_MPV_common_init(s) < 0)
2093         return -1;
2094     s1->mpeg_enc_ctx_allocated = 1;
2095
2096     for (i = 0; i < 64; i++) {
2097         int j = s->dsp.idct_permutation[i];
2098         v = ff_mpeg1_default_intra_matrix[i];
2099         s->intra_matrix[j]        = v;
2100         s->chroma_intra_matrix[j] = v;
2101
2102         v = ff_mpeg1_default_non_intra_matrix[i];
2103         s->inter_matrix[j]        = v;
2104         s->chroma_inter_matrix[j] = v;
2105     }
2106
2107     s->progressive_sequence  = 1;
2108     s->progressive_frame     = 1;
2109     s->picture_structure     = PICT_FRAME;
2110     s->first_field           = 0;
2111     s->frame_pred_frame_dct  = 1;
2112     s->chroma_format         = 1;
2113     if (s->codec_tag == AV_RL32("BW10")) {
2114         s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2115     } else {
2116         exchange_uv(s); // common init reset pblocks, so we swap them here
2117         s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
2118         s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
2119     }
2120     s1->save_width           = s->width;
2121     s1->save_height          = s->height;
2122     s1->save_progressive_seq = s->progressive_sequence;
2123     return 0;
2124 }
2125
2126
2127 static void mpeg_decode_user_data(AVCodecContext *avctx,
2128                                   const uint8_t *p, int buf_size)
2129 {
2130     Mpeg1Context *s = avctx->priv_data;
2131     const uint8_t *buf_end = p + buf_size;
2132
2133     if(buf_size > 29){
2134         int i;
2135         for(i=0; i<20; i++)
2136             if(!memcmp(p+i, "\0TMPGEXS\0", 9)){
2137                 s->tmpgexs= 1;
2138             }
2139
2140 /*        for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i<buf_size; i++){
2141             av_log(avctx, AV_LOG_ERROR, "%c", p[i]);
2142         }
2143             av_log(avctx, AV_LOG_ERROR, "\n");*/
2144     }
2145
2146     /* we parse the DTG active format information */
2147     if (buf_end - p >= 5 &&
2148         p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2149         int flags = p[4];
2150         p += 5;
2151         if (flags & 0x80) {
2152             /* skip event id */
2153             p += 2;
2154         }
2155         if (flags & 0x40) {
2156             if (buf_end - p < 1)
2157                 return;
2158             avctx->dtg_active_format = p[0] & 0x0f;
2159         }
2160     }
2161 }
2162
2163 static void mpeg_decode_gop(AVCodecContext *avctx,
2164                             const uint8_t *buf, int buf_size)
2165 {
2166     Mpeg1Context *s1  = avctx->priv_data;
2167     MpegEncContext *s = &s1->mpeg_enc_ctx;
2168     int broken_link;
2169     int64_t tc;
2170
2171     init_get_bits(&s->gb, buf, buf_size*8);
2172
2173     tc = avctx->timecode_frame_start = get_bits(&s->gb, 25);
2174
2175     s->closed_gop = get_bits1(&s->gb);
2176     /*broken_link indicate that after editing the
2177       reference frames of the first B-Frames after GOP I-Frame
2178       are missing (open gop)*/
2179     broken_link = get_bits1(&s->gb);
2180
2181     if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2182         char tcbuf[AV_TIMECODE_STR_SIZE];
2183         av_timecode_make_mpeg_tc_string(tcbuf, tc);
2184         av_log(s->avctx, AV_LOG_DEBUG,
2185                "GOP (%s) closed_gop=%d broken_link=%d\n",
2186                tcbuf, s->closed_gop, broken_link);
2187     }
2188 }
2189 /**
2190  * Find the end of the current frame in the bitstream.
2191  * @return the position of the first byte of the next frame, or -1
2192  */
2193 int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s)
2194 {
2195     int i;
2196     uint32_t state = pc->state;
2197
2198     /* EOF considered as end of frame */
2199     if (buf_size == 0)
2200         return 0;
2201
2202 /*
2203  0  frame start         -> 1/4
2204  1  first_SEQEXT        -> 0/2
2205  2  first field start   -> 3/0
2206  3  second_SEQEXT       -> 2/0
2207  4  searching end
2208 */
2209
2210     for (i = 0; i < buf_size; i++) {
2211         av_assert1(pc->frame_start_found >= 0 && pc->frame_start_found <= 4);
2212         if (pc->frame_start_found & 1) {
2213             if (state == EXT_START_CODE && (buf[i] & 0xF0) != 0x80)
2214                 pc->frame_start_found--;
2215             else if (state == EXT_START_CODE + 2) {
2216                 if ((buf[i] & 3) == 3)
2217                     pc->frame_start_found = 0;
2218                 else
2219                     pc->frame_start_found = (pc->frame_start_found + 1) & 3;
2220             }
2221             state++;
2222         } else {
2223             i = avpriv_mpv_find_start_code(buf + i, buf + buf_size, &state) - buf - 1;
2224             if (pc->frame_start_found == 0 && state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE) {
2225                 i++;
2226                 pc->frame_start_found = 4;
2227             }
2228             if (state == SEQ_END_CODE) {
2229                 pc->frame_start_found = 0;
2230                 pc->state=-1;
2231                 return i+1;
2232             }
2233             if (pc->frame_start_found == 2 && state == SEQ_START_CODE)
2234                 pc->frame_start_found = 0;
2235             if (pc->frame_start_found  < 4 && state == EXT_START_CODE)
2236                 pc->frame_start_found++;
2237             if (pc->frame_start_found == 4 && (state & 0xFFFFFF00) == 0x100) {
2238                 if (state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE) {
2239                     pc->frame_start_found = 0;
2240                     pc->state             = -1;
2241                     return i - 3;
2242                 }
2243             }
2244             if (pc->frame_start_found == 0 && s && state == PICTURE_START_CODE) {
2245                 ff_fetch_timestamp(s, i - 3, 1);
2246             }
2247         }
2248     }
2249     pc->state = state;
2250     return END_NOT_FOUND;
2251 }
2252
2253 static int decode_chunks(AVCodecContext *avctx,
2254                          AVFrame *picture, int *got_output,
2255                          const uint8_t *buf, int buf_size)
2256 {
2257     Mpeg1Context *s = avctx->priv_data;
2258     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2259     const uint8_t *buf_ptr = buf;
2260     const uint8_t *buf_end = buf + buf_size;
2261     int ret, input_size;
2262     int last_code = 0;
2263
2264     for (;;) {
2265         /* find next start code */
2266         uint32_t start_code = -1;
2267         buf_ptr = avpriv_mpv_find_start_code(buf_ptr, buf_end, &start_code);
2268         if (start_code > 0x1ff) {
2269             if (s2->pict_type != AV_PICTURE_TYPE_B || avctx->skip_frame <= AVDISCARD_DEFAULT) {
2270                 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE)) {
2271                     int i;
2272                     av_assert0(avctx->thread_count > 1);
2273
2274                     avctx->execute(avctx, slice_decode_thread,  &s2->thread_context[0], NULL, s->slice_count, sizeof(void*));
2275                     for (i = 0; i < s->slice_count; i++)
2276                         s2->error_count += s2->thread_context[i]->error_count;
2277                 }
2278
2279                 if (CONFIG_VDPAU && uses_vdpau(avctx))
2280                     ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2281
2282
2283                 if (slice_end(avctx, picture)) {
2284                     if (s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2285                         *got_output = 1;
2286                 }
2287             }
2288             s2->pict_type = 0;
2289             return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2290         }
2291
2292         input_size = buf_end - buf_ptr;
2293
2294         if (avctx->debug & FF_DEBUG_STARTCODE) {
2295             av_log(avctx, AV_LOG_DEBUG, "%3X at %td left %d\n", start_code, buf_ptr-buf, input_size);
2296         }
2297
2298         /* prepare data for next start code */
2299         switch (start_code) {
2300         case SEQ_START_CODE:
2301             if (last_code == 0) {
2302                 mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2303                 if(buf != avctx->extradata)
2304                     s->sync=1;
2305             } else {
2306                 av_log(avctx, AV_LOG_ERROR, "ignoring SEQ_START_CODE after %X\n", last_code);
2307                 if (avctx->err_recognition & AV_EF_EXPLODE)
2308                     return AVERROR_INVALIDDATA;
2309             }
2310             break;
2311
2312         case PICTURE_START_CODE:
2313             if (s2->width <= 0 || s2->height <= 0) {
2314                 av_log(avctx, AV_LOG_ERROR, "%dx%d is invalid\n", s2->width, s2->height);
2315                 return AVERROR_INVALIDDATA;
2316             }
2317
2318             if(s->tmpgexs){
2319                 s2->intra_dc_precision= 3;
2320                 s2->intra_matrix[0]= 1;
2321             }
2322             if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) && s->slice_count) {
2323                 int i;
2324
2325                 avctx->execute(avctx, slice_decode_thread,
2326                                s2->thread_context, NULL,
2327                                s->slice_count, sizeof(void*));
2328                 for (i = 0; i < s->slice_count; i++)
2329                     s2->error_count += s2->thread_context[i]->error_count;
2330                 s->slice_count = 0;
2331             }
2332             if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2333                 ret = mpeg_decode_postinit(avctx);
2334                 if (ret < 0) {
2335                     av_log(avctx, AV_LOG_ERROR, "mpeg_decode_postinit() failure\n");
2336                     return ret;
2337                 }
2338
2339                 /* we have a complete image: we try to decompress it */
2340                 if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2341                     s2->pict_type = 0;
2342                 s2->first_slice = 1;
2343                 last_code = PICTURE_START_CODE;
2344             } else {
2345                 av_log(avctx, AV_LOG_ERROR, "ignoring pic after %X\n", last_code);
2346                 if (avctx->err_recognition & AV_EF_EXPLODE)
2347                     return AVERROR_INVALIDDATA;
2348             }
2349             break;
2350         case EXT_START_CODE:
2351             init_get_bits(&s2->gb, buf_ptr, input_size*8);
2352
2353             switch (get_bits(&s2->gb, 4)) {
2354             case 0x1:
2355                 if (last_code == 0) {
2356                 mpeg_decode_sequence_extension(s);
2357                 } else {
2358                     av_log(avctx, AV_LOG_ERROR, "ignoring seq ext after %X\n", last_code);
2359                     if (avctx->err_recognition & AV_EF_EXPLODE)
2360                         return AVERROR_INVALIDDATA;
2361                 }
2362                 break;
2363             case 0x2:
2364                 mpeg_decode_sequence_display_extension(s);
2365                 break;
2366             case 0x3:
2367                 mpeg_decode_quant_matrix_extension(s2);
2368                 break;
2369             case 0x7:
2370                 mpeg_decode_picture_display_extension(s);
2371                 break;
2372             case 0x8:
2373                 if (last_code == PICTURE_START_CODE) {
2374                     mpeg_decode_picture_coding_extension(s);
2375                 } else {
2376                     av_log(avctx, AV_LOG_ERROR, "ignoring pic cod ext after %X\n", last_code);
2377                     if (avctx->err_recognition & AV_EF_EXPLODE)
2378                         return AVERROR_INVALIDDATA;
2379                 }
2380                 break;
2381             }
2382             break;
2383         case USER_START_CODE:
2384             mpeg_decode_user_data(avctx, buf_ptr, input_size);
2385             break;
2386         case GOP_START_CODE:
2387             if (last_code == 0) {
2388                 s2->first_field=0;
2389                 mpeg_decode_gop(avctx, buf_ptr, input_size);
2390                 s->sync=1;
2391             } else {
2392                 av_log(avctx, AV_LOG_ERROR, "ignoring GOP_START_CODE after %X\n", last_code);
2393                 if (avctx->err_recognition & AV_EF_EXPLODE)
2394                     return AVERROR_INVALIDDATA;
2395             }
2396             break;
2397         default:
2398             if (start_code >= SLICE_MIN_START_CODE &&
2399                 start_code <= SLICE_MAX_START_CODE && last_code == PICTURE_START_CODE) {
2400
2401                 if (s2->progressive_sequence && !s2->progressive_frame) {
2402                     s2->progressive_frame = 1;
2403                     av_log(s2->avctx, AV_LOG_ERROR, "interlaced frame in progressive sequence, ignoring\n");
2404                 }
2405
2406                 if (s2->picture_structure == 0 || (s2->progressive_frame && s2->picture_structure != PICT_FRAME)) {
2407                     av_log(s2->avctx, AV_LOG_ERROR, "picture_structure %d invalid, ignoring\n", s2->picture_structure);
2408                     s2->picture_structure = PICT_FRAME;
2409                 }
2410
2411                 if (s2->progressive_sequence && !s2->frame_pred_frame_dct) {
2412                     av_log(s2->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
2413                 }
2414
2415                 if (s2->picture_structure == PICT_FRAME) {
2416                     s2->first_field = 0;
2417                     s2->v_edge_pos  = 16 * s2->mb_height;
2418                 } else {
2419                     s2->first_field ^= 1;
2420                     s2->v_edge_pos   = 8 * s2->mb_height;
2421                     memset(s2->mbskip_table, 0, s2->mb_stride * s2->mb_height);
2422                 }
2423             }
2424             if (start_code >= SLICE_MIN_START_CODE &&
2425                 start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2426                 const int field_pic = s2->picture_structure != PICT_FRAME;
2427                 int mb_y = start_code - SLICE_MIN_START_CODE;
2428                 last_code = SLICE_MIN_START_CODE;
2429                 if(s2->codec_id != AV_CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
2430                     mb_y += (*buf_ptr&0xE0)<<2;
2431
2432                 mb_y <<= field_pic;
2433                 if (s2->picture_structure == PICT_BOTTOM_FIELD)
2434                     mb_y++;
2435
2436                 if (mb_y >= s2->mb_height) {
2437                     av_log(s2->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2438                     return -1;
2439                 }
2440
2441                 if (s2->last_picture_ptr == NULL) {
2442                 /* Skip B-frames if we do not have reference frames and gop is not closed */
2443                     if (s2->pict_type == AV_PICTURE_TYPE_B) {
2444                         if (!s2->closed_gop)
2445                             break;
2446                     }
2447                 }
2448                 if (s2->pict_type == AV_PICTURE_TYPE_I || (s2->flags2 & CODEC_FLAG2_SHOW_ALL))
2449                     s->sync=1;
2450                 if (s2->next_picture_ptr == NULL) {
2451                 /* Skip P-frames if we do not have a reference frame or we have an invalid header. */
2452                     if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) break;
2453                 }
2454                 if ((avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type == AV_PICTURE_TYPE_B) ||
2455                     (avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type != AV_PICTURE_TYPE_I) ||
2456                      avctx->skip_frame >= AVDISCARD_ALL)
2457                     break;
2458
2459                 if (!s->mpeg_enc_ctx_allocated)
2460                     break;
2461
2462                 if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2463                     if (mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
2464                         break;
2465                 }
2466
2467                 if (!s2->pict_type) {
2468                     av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2469                     if (avctx->err_recognition & AV_EF_EXPLODE)
2470                         return AVERROR_INVALIDDATA;
2471                     break;
2472                 }
2473
2474                 if (s2->first_slice) {
2475                     s2->first_slice = 0;
2476                     if (mpeg_field_start(s2, buf, buf_size) < 0)
2477                         return -1;
2478                 }
2479                 if (!s2->current_picture_ptr) {
2480                     av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
2481                     return AVERROR_INVALIDDATA;
2482                 }
2483
2484                 if (uses_vdpau(avctx)) {
2485                     s->slice_count++;
2486                     break;
2487                 }
2488
2489                 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE)) {
2490                     int threshold = (s2->mb_height * s->slice_count +
2491                                      s2->slice_context_count / 2) /
2492                                     s2->slice_context_count;
2493                     av_assert0(avctx->thread_count > 1);
2494                     if (threshold <= mb_y) {
2495                         MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2496
2497                         thread_context->start_mb_y = mb_y;
2498                         thread_context->end_mb_y   = s2->mb_height;
2499                         if (s->slice_count) {
2500                             s2->thread_context[s->slice_count-1]->end_mb_y = mb_y;
2501                             ret = ff_update_duplicate_context(thread_context,
2502                                                               s2);
2503                             if (ret < 0)
2504                                 return ret;
2505                         }
2506                         init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2507                         s->slice_count++;
2508                     }
2509                     buf_ptr += 2; // FIXME add minimum number of bytes per slice
2510                 } else {
2511                     ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2512                     emms_c();
2513
2514                     if (ret < 0) {
2515                         if (avctx->err_recognition & AV_EF_EXPLODE)
2516                             return ret;
2517                         if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2518                             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);
2519                     } else {
2520                         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);
2521                     }
2522                 }
2523             }
2524             break;
2525         }
2526     }
2527 }
2528
2529 static int mpeg_decode_frame(AVCodecContext *avctx,
2530                              void *data, int *got_output,
2531                              AVPacket *avpkt)
2532 {
2533     const uint8_t *buf = avpkt->data;
2534     int ret;
2535     int buf_size = avpkt->size;
2536     Mpeg1Context *s = avctx->priv_data;
2537     AVFrame *picture = data;
2538     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2539     av_dlog(avctx, "fill_buffer\n");
2540
2541     if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2542         /* special case for last picture */
2543         if (s2->low_delay == 0 && s2->next_picture_ptr) {
2544             *picture = s2->next_picture_ptr->f;
2545             s2->next_picture_ptr = NULL;
2546
2547             *got_output = 1;
2548         }
2549         return buf_size;
2550     }
2551
2552     if (s2->flags & CODEC_FLAG_TRUNCATED) {
2553         int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size, NULL);
2554
2555         if (ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0)
2556             return buf_size;
2557     }
2558
2559     s2->codec_tag = avpriv_toupper4(avctx->codec_tag);
2560     if (s->mpeg_enc_ctx_allocated == 0 && (   s2->codec_tag == AV_RL32("VCR2")
2561                                            || s2->codec_tag == AV_RL32("BW10")
2562                                           ))
2563         vcr2_init_sequence(avctx);
2564
2565     s->slice_count = 0;
2566
2567     if (avctx->extradata && !s->extradata_decoded) {
2568         ret = decode_chunks(avctx, picture, got_output, avctx->extradata, avctx->extradata_size);
2569         if(*got_output) {
2570             av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
2571             *got_output = 0;
2572         }
2573         s->extradata_decoded = 1;
2574         if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) {
2575             s2->current_picture_ptr = NULL;
2576             return ret;
2577         }
2578     }
2579
2580     ret = decode_chunks(avctx, picture, got_output, buf, buf_size);
2581     if (ret<0 || *got_output)
2582         s2->current_picture_ptr = NULL;
2583
2584     return ret;
2585 }
2586
2587
2588 static void flush(AVCodecContext *avctx)
2589 {
2590     Mpeg1Context *s = avctx->priv_data;
2591
2592     s->sync=0;
2593
2594     ff_mpeg_flush(avctx);
2595 }
2596
2597 static int mpeg_decode_end(AVCodecContext *avctx)
2598 {
2599     Mpeg1Context *s = avctx->priv_data;
2600
2601     if (s->mpeg_enc_ctx_allocated)
2602         ff_MPV_common_end(&s->mpeg_enc_ctx);
2603     return 0;
2604 }
2605
2606 static const AVProfile mpeg2_video_profiles[] = {
2607     { FF_PROFILE_MPEG2_422,          "4:2:2"              },
2608     { FF_PROFILE_MPEG2_HIGH,         "High"               },
2609     { FF_PROFILE_MPEG2_SS,           "Spatially Scalable" },
2610     { FF_PROFILE_MPEG2_SNR_SCALABLE, "SNR Scalable"       },
2611     { FF_PROFILE_MPEG2_MAIN,         "Main"               },
2612     { FF_PROFILE_MPEG2_SIMPLE,       "Simple"             },
2613     { FF_PROFILE_RESERVED,           "Reserved"           },
2614     { FF_PROFILE_RESERVED,           "Reserved"           },
2615     { FF_PROFILE_UNKNOWN },
2616 };
2617
2618
2619 AVCodec ff_mpeg1video_decoder = {
2620     .name                  = "mpeg1video",
2621     .type                  = AVMEDIA_TYPE_VIDEO,
2622     .id                    = AV_CODEC_ID_MPEG1VIDEO,
2623     .priv_data_size        = sizeof(Mpeg1Context),
2624     .init                  = mpeg_decode_init,
2625     .close                 = mpeg_decode_end,
2626     .decode                = mpeg_decode_frame,
2627     .capabilities          = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2628                              CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2629                              CODEC_CAP_SLICE_THREADS,
2630     .flush                 = flush,
2631     .max_lowres            = 3,
2632     .long_name             = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2633     .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context)
2634 };
2635
2636 AVCodec ff_mpeg2video_decoder = {
2637     .name           = "mpeg2video",
2638     .type           = AVMEDIA_TYPE_VIDEO,
2639     .id             = AV_CODEC_ID_MPEG2VIDEO,
2640     .priv_data_size = sizeof(Mpeg1Context),
2641     .init           = mpeg_decode_init,
2642     .close          = mpeg_decode_end,
2643     .decode         = mpeg_decode_frame,
2644     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2645                       CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2646                       CODEC_CAP_SLICE_THREADS,
2647     .flush          = flush,
2648     .max_lowres     = 3,
2649     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2650     .profiles       = NULL_IF_CONFIG_SMALL(mpeg2_video_profiles),
2651 };
2652
2653 //legacy decoder
2654 AVCodec ff_mpegvideo_decoder = {
2655     .name           = "mpegvideo",
2656     .type           = AVMEDIA_TYPE_VIDEO,
2657     .id             = AV_CODEC_ID_MPEG2VIDEO,
2658     .priv_data_size = sizeof(Mpeg1Context),
2659     .init           = mpeg_decode_init,
2660     .close          = mpeg_decode_end,
2661     .decode         = mpeg_decode_frame,
2662     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
2663     .flush          = flush,
2664     .max_lowres     = 3,
2665     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2666 };
2667
2668 #if CONFIG_MPEG_XVMC_DECODER
2669 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx)
2670 {
2671     if (avctx->active_thread_type & FF_THREAD_SLICE)
2672         return -1;
2673     if (!(avctx->slice_flags & SLICE_FLAG_CODED_ORDER))
2674         return -1;
2675     if (!(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
2676         av_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2677     }
2678     mpeg_decode_init(avctx);
2679
2680     avctx->pix_fmt           = AV_PIX_FMT_XVMC_MPEG2_IDCT;
2681     avctx->xvmc_acceleration = 2; // 2 - the blocks are packed!
2682
2683     return 0;
2684 }
2685
2686 AVCodec ff_mpeg_xvmc_decoder = {
2687     .name           = "mpegvideo_xvmc",
2688     .type           = AVMEDIA_TYPE_VIDEO,
2689     .id             = AV_CODEC_ID_MPEG2VIDEO_XVMC,
2690     .priv_data_size = sizeof(Mpeg1Context),
2691     .init           = mpeg_mc_decode_init,
2692     .close          = mpeg_decode_end,
2693     .decode         = mpeg_decode_frame,
2694     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2695                       CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2696     .flush          = flush,
2697     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2698 };
2699
2700 #endif
2701
2702 #if CONFIG_MPEG_VDPAU_DECODER
2703 AVCodec ff_mpeg_vdpau_decoder = {
2704     .name           = "mpegvideo_vdpau",
2705     .type           = AVMEDIA_TYPE_VIDEO,
2706     .id             = AV_CODEC_ID_MPEG2VIDEO,
2707     .priv_data_size = sizeof(Mpeg1Context),
2708     .init           = mpeg_decode_init,
2709     .close          = mpeg_decode_end,
2710     .decode         = mpeg_decode_frame,
2711     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2712                       CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2713     .flush          = flush,
2714     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2715 };
2716 #endif
2717
2718 #if CONFIG_MPEG1_VDPAU_DECODER
2719 AVCodec ff_mpeg1_vdpau_decoder = {
2720     .name           = "mpeg1video_vdpau",
2721     .type           = AVMEDIA_TYPE_VIDEO,
2722     .id             = AV_CODEC_ID_MPEG1VIDEO,
2723     .priv_data_size = sizeof(Mpeg1Context),
2724     .init           = mpeg_decode_init,
2725     .close          = mpeg_decode_end,
2726     .decode         = mpeg_decode_frame,
2727     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2728                       CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2729     .flush          = flush,
2730     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
2731 };
2732 #endif