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   1 /*
   2  * MPEG-1/2 decoder
   3  * Copyright (c) 2000, 2001 Fabrice Bellard
   4  * Copyright (c) 2002-2013 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 #include <inttypes.h>
  30
  31 #include "libavutil/attributes.h"
  32 #include "libavutil/imgutils.h"
  33 #include "libavutil/internal.h"
  34 #include "libavutil/stereo3d.h"
  35
  36 #include "avcodec.h"
  37 #include "bytestream.h"
  38 #include "error_resilience.h"
  39 #include "idctdsp.h"
  40 #include "internal.h"
  41 #include "mpeg_er.h"
  42 #include "mpeg12.h"
  43 #include "mpeg12data.h"
  44 #include "mpegutils.h"
  45 #include "mpegvideo.h"
  46 #include "mpegvideodata.h"
  47 #include "profiles.h"
  48 #include "thread.h"
  49 #include "version.h"
  50 #include "vdpau_compat.h"
  51 #include "xvmc_internal.h"
  52
  53 typedef struct Mpeg1Context {
  54     MpegEncContext mpeg_enc_ctx;
  55     int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
  56     int repeat_field;           /* true if we must repeat the field */
  57     AVPanScan pan_scan;         /* some temporary storage for the panscan */
  58     AVStereo3D stereo3d;
  59     int has_stereo3d;
  60     uint8_t *a53_caption;
  61     int a53_caption_size;
  62     uint8_t afd;
  63     int has_afd;
  64     int slice_count;
  65     AVRational save_aspect;
  66     int save_width, save_height, save_progressive_seq;
  67     AVRational frame_rate_ext;  /* MPEG-2 specific framerate modificator */
  68     int sync;                   /* Did we reach a sync point like a GOP/SEQ/KEYFrame? */
  69     int tmpgexs;
  70     int first_slice;
  71     int extradata_decoded;
  72 } Mpeg1Context;
  73
  74 #define MB_TYPE_ZERO_MV   0x20000000
  75
  76 static const uint32_t ptype2mb_type[7] = {
  77                     MB_TYPE_INTRA,
  78                     MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
  79                     MB_TYPE_L0,
  80                     MB_TYPE_L0 | MB_TYPE_CBP,
  81     MB_TYPE_QUANT | MB_TYPE_INTRA,
  82     MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
  83     MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
  84 };
  85
  86 static const uint32_t btype2mb_type[11] = {
  87                     MB_TYPE_INTRA,
  88                     MB_TYPE_L1,
  89                     MB_TYPE_L1   | MB_TYPE_CBP,
  90                     MB_TYPE_L0,
  91                     MB_TYPE_L0   | MB_TYPE_CBP,
  92                     MB_TYPE_L0L1,
  93                     MB_TYPE_L0L1 | MB_TYPE_CBP,
  94     MB_TYPE_QUANT | MB_TYPE_INTRA,
  95     MB_TYPE_QUANT | MB_TYPE_L1   | MB_TYPE_CBP,
  96     MB_TYPE_QUANT | MB_TYPE_L0   | MB_TYPE_CBP,
  97     MB_TYPE_QUANT | MB_TYPE_L0L1 | MB_TYPE_CBP,
  98 };
  99
 100 /* as H.263, but only 17 codes */
 101 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
 102 {
 103     int code, sign, val, shift;
 104
 105     code = get_vlc2(&s->gb, ff_mv_vlc.table, MV_VLC_BITS, 2);
 106     if (code == 0)
 107         return pred;
 108     if (code < 0)
 109         return 0xffff;
 110
 111     sign  = get_bits1(&s->gb);
 112     shift = fcode - 1;
 113     val   = code;
 114     if (shift) {
 115         val  = (val - 1) << shift;
 116         val |= get_bits(&s->gb, shift);
 117         val++;
 118     }
 119     if (sign)
 120         val = -val;
 121     val += pred;
 122
 123     /* modulo decoding */
 124     return sign_extend(val, 5 + shift);
 125 }
 126
 127 #define MAX_INDEX (64 - 1)
 128 #define check_scantable_index(ctx, x)                                         \
 129     do {                                                                      \
 130         if ((x) > MAX_INDEX) {                                                \
 131             av_log(ctx->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n",     \
 132                    ctx->mb_x, ctx->mb_y);                                     \
 133             return AVERROR_INVALIDDATA;                                       \
 134         }                                                                     \
 135     } while (0)
 136
 137 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
 138                                            int16_t *block, int n)
 139 {
 140     int level, i, j, run;
 141     RLTable *rl                  = &ff_rl_mpeg1;
 142     uint8_t *const scantable     = s->intra_scantable.permutated;
 143     const uint16_t *quant_matrix = s->inter_matrix;
 144     const int qscale             = s->qscale;
 145
 146     {
 147         OPEN_READER(re, &s->gb);
 148         i = -1;
 149         // special case for first coefficient, no need to add second VLC table
 150         UPDATE_CACHE(re, &s->gb);
 151         if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
 152             level = (3 * qscale * quant_matrix[0]) >> 5;
 153             level = (level - 1) | 1;
 154             if (GET_CACHE(re, &s->gb) & 0x40000000)
 155                 level = -level;
 156             block[0] = level;
 157             i++;
 158             SKIP_BITS(re, &s->gb, 2);
 159             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
 160                 goto end;
 161         }
 162         /* now quantify & encode AC coefficients */
 163         for (;;) {
 164             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
 165                        TEX_VLC_BITS, 2, 0);
 166
 167             if (level != 0) {
 168                 i += run;
 169                 if (i > MAX_INDEX)
 170                     break;
 171                 j = scantable[i];
 172                 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 173                 level = (level - 1) | 1;
 174                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
 175                         SHOW_SBITS(re, &s->gb, 1);
 176                 SKIP_BITS(re, &s->gb, 1);
 177             } else {
 178                 /* escape */
 179                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
 180                 LAST_SKIP_BITS(re, &s->gb, 6);
 181                 UPDATE_CACHE(re, &s->gb);
 182                 level = SHOW_SBITS(re, &s->gb, 8);
 183                 SKIP_BITS(re, &s->gb, 8);
 184                 if (level == -128) {
 185                     level = SHOW_UBITS(re, &s->gb, 8) - 256;
 186                     SKIP_BITS(re, &s->gb, 8);
 187                 } else if (level == 0) {
 188                     level = SHOW_UBITS(re, &s->gb, 8);
 189                     SKIP_BITS(re, &s->gb, 8);
 190                 }
 191                 i += run;
 192                 if (i > MAX_INDEX)
 193                     break;
 194                 j = scantable[i];
 195                 if (level < 0) {
 196                     level = -level;
 197                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 198                     level = (level - 1) | 1;
 199                     level = -level;
 200                 } else {
 201                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 202                     level = (level - 1) | 1;
 203                 }
 204             }
 205
 206             block[j] = level;
 207             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
 208                 break;
 209             UPDATE_CACHE(re, &s->gb);
 210         }
 211 end:
 212         LAST_SKIP_BITS(re, &s->gb, 2);
 213         CLOSE_READER(re, &s->gb);
 214     }
 215
 216     check_scantable_index(s, i);
 217
 218     s->block_last_index[n] = i;
 219     return 0;
 220 }
 221
 222 /**
 223  * Note: this function can read out of range and crash for corrupt streams.
 224  * Changing this would eat up any speed benefits it has.
 225  * Do not use "fast" flag if you need the code to be robust.
 226  */
 227 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s,
 228                                                 int16_t *block, int n)
 229 {
 230     int level, i, j, run;
 231     RLTable *rl              = &ff_rl_mpeg1;
 232     uint8_t *const scantable = s->intra_scantable.permutated;
 233     const int qscale         = s->qscale;
 234
 235     {
 236         OPEN_READER(re, &s->gb);
 237         i = -1;
 238         // Special case for first coefficient, no need to add second VLC table.
 239         UPDATE_CACHE(re, &s->gb);
 240         if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
 241             level = (3 * qscale) >> 1;
 242             level = (level - 1) | 1;
 243             if (GET_CACHE(re, &s->gb) & 0x40000000)
 244                 level = -level;
 245             block[0] = level;
 246             i++;
 247             SKIP_BITS(re, &s->gb, 2);
 248             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
 249                 goto end;
 250         }
 251
 252         /* now quantify & encode AC coefficients */
 253         for (;;) {
 254             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
 255                        TEX_VLC_BITS, 2, 0);
 256
 257             if (level != 0) {
 258                 i += run;
 259                 if (i > MAX_INDEX)
 260                     break;
 261                 j = scantable[i];
 262                 level = ((level * 2 + 1) * qscale) >> 1;
 263                 level = (level - 1) | 1;
 264                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
 265                         SHOW_SBITS(re, &s->gb, 1);
 266                 SKIP_BITS(re, &s->gb, 1);
 267             } else {
 268                 /* escape */
 269                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
 270                 LAST_SKIP_BITS(re, &s->gb, 6);
 271                 UPDATE_CACHE(re, &s->gb);
 272                 level = SHOW_SBITS(re, &s->gb, 8);
 273                 SKIP_BITS(re, &s->gb, 8);
 274                 if (level == -128) {
 275                     level = SHOW_UBITS(re, &s->gb, 8) - 256;
 276                     SKIP_BITS(re, &s->gb, 8);
 277                 } else if (level == 0) {
 278                     level = SHOW_UBITS(re, &s->gb, 8);
 279                     SKIP_BITS(re, &s->gb, 8);
 280                 }
 281                 i += run;
 282                 if (i > MAX_INDEX)
 283                     break;
 284                 j = scantable[i];
 285                 if (level < 0) {
 286                     level = -level;
 287                     level = ((level * 2 + 1) * qscale) >> 1;
 288                     level = (level - 1) | 1;
 289                     level = -level;
 290                 } else {
 291                     level = ((level * 2 + 1) * qscale) >> 1;
 292                     level = (level - 1) | 1;
 293                 }
 294             }
 295
 296             block[j] = level;
 297             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
 298                 break;
 299             UPDATE_CACHE(re, &s->gb);
 300         }
 301 end:
 302         LAST_SKIP_BITS(re, &s->gb, 2);
 303         CLOSE_READER(re, &s->gb);
 304     }
 305
 306     check_scantable_index(s, i);
 307
 308     s->block_last_index[n] = i;
 309     return 0;
 310 }
 311
 312 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
 313                                                int16_t *block, int n)
 314 {
 315     int level, i, j, run;
 316     RLTable *rl = &ff_rl_mpeg1;
 317     uint8_t *const scantable = s->intra_scantable.permutated;
 318     const uint16_t *quant_matrix;
 319     const int qscale = s->qscale;
 320     int mismatch;
 321
 322     mismatch = 1;
 323
 324     {
 325         OPEN_READER(re, &s->gb);
 326         i = -1;
 327         if (n < 4)
 328             quant_matrix = s->inter_matrix;
 329         else
 330             quant_matrix = s->chroma_inter_matrix;
 331
 332         // Special case for first coefficient, no need to add second VLC table.
 333         UPDATE_CACHE(re, &s->gb);
 334         if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
 335             level = (3 * qscale * quant_matrix[0]) >> 5;
 336             if (GET_CACHE(re, &s->gb) & 0x40000000)
 337                 level = -level;
 338             block[0]  = level;
 339             mismatch ^= level;
 340             i++;
 341             SKIP_BITS(re, &s->gb, 2);
 342             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
 343                 goto end;
 344         }
 345
 346         /* now quantify & encode AC coefficients */
 347         for (;;) {
 348             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
 349                        TEX_VLC_BITS, 2, 0);
 350
 351             if (level != 0) {
 352                 i += run;
 353                 if (i > MAX_INDEX)
 354                     break;
 355                 j = scantable[i];
 356                 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 357                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
 358                         SHOW_SBITS(re, &s->gb, 1);
 359                 SKIP_BITS(re, &s->gb, 1);
 360             } else {
 361                 /* escape */
 362                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
 363                 LAST_SKIP_BITS(re, &s->gb, 6);
 364                 UPDATE_CACHE(re, &s->gb);
 365                 level = SHOW_SBITS(re, &s->gb, 12);
 366                 SKIP_BITS(re, &s->gb, 12);
 367
 368                 i += run;
 369                 if (i > MAX_INDEX)
 370                     break;
 371                 j = scantable[i];
 372                 if (level < 0) {
 373                     level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 374                     level = -level;
 375                 } else {
 376                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 377                 }
 378             }
 379
 380             mismatch ^= level;
 381             block[j]  = level;
 382             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
 383                 break;
 384             UPDATE_CACHE(re, &s->gb);
 385         }
 386 end:
 387         LAST_SKIP_BITS(re, &s->gb, 2);
 388         CLOSE_READER(re, &s->gb);
 389     }
 390     block[63] ^= (mismatch & 1);
 391
 392     check_scantable_index(s, i);
 393
 394     s->block_last_index[n] = i;
 395     return 0;
 396 }
 397
 398 /**
 399  * Note: this function can read out of range and crash for corrupt streams.
 400  * Changing this would eat up any speed benefits it has.
 401  * Do not use "fast" flag if you need the code to be robust.
 402  */
 403 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
 404                                                     int16_t *block, int n)
 405 {
 406     int level, i, j, run;
 407     RLTable *rl              = &ff_rl_mpeg1;
 408     uint8_t *const scantable = s->intra_scantable.permutated;
 409     const int qscale         = s->qscale;
 410     OPEN_READER(re, &s->gb);
 411     i = -1;
 412
 413     // special case for first coefficient, no need to add second VLC table
 414     UPDATE_CACHE(re, &s->gb);
 415     if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
 416         level = (3 * qscale) >> 1;
 417         if (GET_CACHE(re, &s->gb) & 0x40000000)
 418             level = -level;
 419         block[0] = level;
 420         i++;
 421         SKIP_BITS(re, &s->gb, 2);
 422         if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
 423             goto end;
 424     }
 425
 426     /* now quantify & encode AC coefficients */
 427     for (;;) {
 428         GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
 429
 430         if (level != 0) {
 431             i += run;
 432             if (i > MAX_INDEX)
 433                 break;
 434             j = scantable[i];
 435             level = ((level * 2 + 1) * qscale) >> 1;
 436             level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
 437                     SHOW_SBITS(re, &s->gb, 1);
 438             SKIP_BITS(re, &s->gb, 1);
 439         } else {
 440             /* escape */
 441             run = SHOW_UBITS(re, &s->gb, 6) + 1;
 442             LAST_SKIP_BITS(re, &s->gb, 6);
 443             UPDATE_CACHE(re, &s->gb);
 444             level = SHOW_SBITS(re, &s->gb, 12);
 445             SKIP_BITS(re, &s->gb, 12);
 446
 447             i += run;
 448             if (i > MAX_INDEX)
 449                 break;
 450             j = scantable[i];
 451             if (level < 0) {
 452                 level = ((-level * 2 + 1) * qscale) >> 1;
 453                 level = -level;
 454             } else {
 455                 level = ((level * 2 + 1) * qscale) >> 1;
 456             }
 457         }
 458
 459         block[j] = level;
 460         if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF || i > 63)
 461             break;
 462
 463         UPDATE_CACHE(re, &s->gb);
 464     }
 465 end:
 466     LAST_SKIP_BITS(re, &s->gb, 2);
 467     CLOSE_READER(re, &s->gb);
 468
 469     check_scantable_index(s, i);
 470
 471     s->block_last_index[n] = i;
 472     return 0;
 473 }
 474
 475 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
 476                                            int16_t *block, int n)
 477 {
 478     int level, dc, diff, i, j, run;
 479     int component;
 480     RLTable *rl;
 481     uint8_t *const scantable = s->intra_scantable.permutated;
 482     const uint16_t *quant_matrix;
 483     const int qscale = s->qscale;
 484     int mismatch;
 485
 486     /* DC coefficient */
 487     if (n < 4) {
 488         quant_matrix = s->intra_matrix;
 489         component    = 0;
 490     } else {
 491         quant_matrix = s->chroma_intra_matrix;
 492         component    = (n & 1) + 1;
 493     }
 494     diff = decode_dc(&s->gb, component);
 495     if (diff >= 0xffff)
 496         return AVERROR_INVALIDDATA;
 497     dc  = s->last_dc[component];
 498     dc += diff;
 499     s->last_dc[component] = dc;
 500     block[0] = dc << (3 - s->intra_dc_precision);
 501     ff_tlog(s->avctx, "dc=%d\n", block[0]);
 502     mismatch = block[0] ^ 1;
 503     i = 0;
 504     if (s->intra_vlc_format)
 505         rl = &ff_rl_mpeg2;
 506     else
 507         rl = &ff_rl_mpeg1;
 508
 509     {
 510         OPEN_READER(re, &s->gb);
 511         /* now quantify & encode AC coefficients */
 512         for (;;) {
 513             UPDATE_CACHE(re, &s->gb);
 514             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
 515                        TEX_VLC_BITS, 2, 0);
 516
 517             if (level == 127) {
 518                 break;
 519             } else if (level != 0) {
 520                 i += run;
 521                 if (i > MAX_INDEX)
 522                     break;
 523                 j = scantable[i];
 524                 level = (level * qscale * quant_matrix[j]) >> 4;
 525                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
 526                         SHOW_SBITS(re, &s->gb, 1);
 527                 LAST_SKIP_BITS(re, &s->gb, 1);
 528             } else {
 529                 /* escape */
 530                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
 531                 LAST_SKIP_BITS(re, &s->gb, 6);
 532                 UPDATE_CACHE(re, &s->gb);
 533                 level = SHOW_SBITS(re, &s->gb, 12);
 534                 SKIP_BITS(re, &s->gb, 12);
 535                 i += run;
 536                 if (i > MAX_INDEX)
 537                     break;
 538                 j = scantable[i];
 539                 if (level < 0) {
 540                     level = (-level * qscale * quant_matrix[j]) >> 4;
 541                     level = -level;
 542                 } else {
 543                     level = (level * qscale * quant_matrix[j]) >> 4;
 544                 }
 545             }
 546
 547             mismatch ^= level;
 548             block[j]  = level;
 549         }
 550         CLOSE_READER(re, &s->gb);
 551     }
 552     block[63] ^= mismatch & 1;
 553
 554     check_scantable_index(s, i);
 555
 556     s->block_last_index[n] = i;
 557     return 0;
 558 }
 559
 560 /**
 561  * Note: this function can read out of range and crash for corrupt streams.
 562  * Changing this would eat up any speed benefits it has.
 563  * Do not use "fast" flag if you need the code to be robust.
 564  */
 565 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
 566                                                 int16_t *block, int n)
 567 {
 568     int level, dc, diff, i, j, run;
 569     int component;
 570     RLTable *rl;
 571     uint8_t *const scantable = s->intra_scantable.permutated;
 572     const uint16_t *quant_matrix;
 573     const int qscale = s->qscale;
 574
 575     /* DC coefficient */
 576     if (n < 4) {
 577         quant_matrix = s->intra_matrix;
 578         component    = 0;
 579     } else {
 580         quant_matrix = s->chroma_intra_matrix;
 581         component    = (n & 1) + 1;
 582     }
 583     diff = decode_dc(&s->gb, component);
 584     if (diff >= 0xffff)
 585         return AVERROR_INVALIDDATA;
 586     dc = s->last_dc[component];
 587     dc += diff;
 588     s->last_dc[component] = dc;
 589     block[0] = dc << (3 - s->intra_dc_precision);
 590     i = 0;
 591     if (s->intra_vlc_format)
 592         rl = &ff_rl_mpeg2;
 593     else
 594         rl = &ff_rl_mpeg1;
 595
 596     {
 597         OPEN_READER(re, &s->gb);
 598         /* now quantify & encode AC coefficients */
 599         for (;;) {
 600             UPDATE_CACHE(re, &s->gb);
 601             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
 602                        TEX_VLC_BITS, 2, 0);
 603
 604             if (level >= 64 || i > 63) {
 605                 break;
 606             } else if (level != 0) {
 607                 i += run;
 608                 j = scantable[i];
 609                 level = (level * qscale * quant_matrix[j]) >> 4;
 610                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
 611                         SHOW_SBITS(re, &s->gb, 1);
 612                 LAST_SKIP_BITS(re, &s->gb, 1);
 613             } else {
 614                 /* escape */
 615                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
 616                 LAST_SKIP_BITS(re, &s->gb, 6);
 617                 UPDATE_CACHE(re, &s->gb);
 618                 level = SHOW_SBITS(re, &s->gb, 12);
 619                 SKIP_BITS(re, &s->gb, 12);
 620                 i += run;
 621                 j = scantable[i];
 622                 if (level < 0) {
 623                     level = (-level * qscale * quant_matrix[j]) >> 4;
 624                     level = -level;
 625                 } else {
 626                     level = (level * qscale * quant_matrix[j]) >> 4;
 627                 }
 628             }
 629
 630             block[j] = level;
 631         }
 632         CLOSE_READER(re, &s->gb);
 633     }
 634
 635     check_scantable_index(s, i);
 636
 637     s->block_last_index[n] = i;
 638     return 0;
 639 }
 640
 641 /******************************************/
 642 /* decoding */
 643
 644 static inline int get_dmv(MpegEncContext *s)
 645 {
 646     if (get_bits1(&s->gb))
 647         return 1 - (get_bits1(&s->gb) << 1);
 648     else
 649         return 0;
 650 }
 651
 652 static inline int get_qscale(MpegEncContext *s)
 653 {
 654     int qscale = get_bits(&s->gb, 5);
 655     if (s->q_scale_type)
 656         return ff_mpeg2_non_linear_qscale[qscale];
 657     else
 658         return qscale << 1;
 659 }
 660
 661
 662 /* motion type (for MPEG-2) */
 663 #define MT_FIELD 1
 664 #define MT_FRAME 2
 665 #define MT_16X8  2
 666 #define MT_DMV   3
 667
 668 static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
 669 {
 670     int i, j, k, cbp, val, mb_type, motion_type;
 671     const int mb_block_count = 4 + (1 << s->chroma_format);
 672     int ret;
 673
 674     ff_tlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
 675
 676     av_assert2(s->mb_skipped == 0);
 677
 678     if (s->mb_skip_run-- != 0) {
 679         if (s->pict_type == AV_PICTURE_TYPE_P) {
 680             s->mb_skipped = 1;
 681             s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
 682                 MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
 683         } else {
 684             int mb_type;
 685
 686             if (s->mb_x)
 687                 mb_type = s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
 688             else
 689                 // FIXME not sure if this is allowed in MPEG at all
 690                 mb_type = s->current_picture.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1];
 691             if (IS_INTRA(mb_type)) {
 692                 av_log(s->avctx, AV_LOG_ERROR, "skip with previntra\n");
 693                 return AVERROR_INVALIDDATA;
 694             }
 695             s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
 696                 mb_type | MB_TYPE_SKIP;
 697
 698             if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
 699                 s->mb_skipped = 1;
 700         }
 701
 702         return 0;
 703     }
 704
 705     switch (s->pict_type) {
 706     default:
 707     case AV_PICTURE_TYPE_I:
 708         if (get_bits1(&s->gb) == 0) {
 709             if (get_bits1(&s->gb) == 0) {
 710                 av_log(s->avctx, AV_LOG_ERROR,
 711                        "invalid mb type in I Frame at %d %d\n",
 712                        s->mb_x, s->mb_y);
 713                 return AVERROR_INVALIDDATA;
 714             }
 715             mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
 716         } else {
 717             mb_type = MB_TYPE_INTRA;
 718         }
 719         break;
 720     case AV_PICTURE_TYPE_P:
 721         mb_type = get_vlc2(&s->gb, ff_mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
 722         if (mb_type < 0) {
 723             av_log(s->avctx, AV_LOG_ERROR,
 724                    "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
 725             return AVERROR_INVALIDDATA;
 726         }
 727         mb_type = ptype2mb_type[mb_type];
 728         break;
 729     case AV_PICTURE_TYPE_B:
 730         mb_type = get_vlc2(&s->gb, ff_mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
 731         if (mb_type < 0) {
 732             av_log(s->avctx, AV_LOG_ERROR,
 733                    "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
 734             return AVERROR_INVALIDDATA;
 735         }
 736         mb_type = btype2mb_type[mb_type];
 737         break;
 738     }
 739     ff_tlog(s->avctx, "mb_type=%x\n", mb_type);
 740 //    motion_type = 0; /* avoid warning */
 741     if (IS_INTRA(mb_type)) {
 742         s->bdsp.clear_blocks(s->block[0]);
 743
 744         if (!s->chroma_y_shift)
 745             s->bdsp.clear_blocks(s->block[6]);
 746
 747         /* compute DCT type */
 748         // FIXME: add an interlaced_dct coded var?
 749         if (s->picture_structure == PICT_FRAME &&
 750             !s->frame_pred_frame_dct)
 751             s->interlaced_dct = get_bits1(&s->gb);
 752
 753         if (IS_QUANT(mb_type))
 754             s->qscale = get_qscale(s);
 755
 756         if (s->concealment_motion_vectors) {
 757             /* just parse them */
 758             if (s->picture_structure != PICT_FRAME)
 759                 skip_bits1(&s->gb);  /* field select */
 760
 761             s->mv[0][0][0]      =
 762             s->last_mv[0][0][0] =
 763             s->last_mv[0][1][0] = mpeg_decode_motion(s, s->mpeg_f_code[0][0],
 764                                                      s->last_mv[0][0][0]);
 765             s->mv[0][0][1]      =
 766             s->last_mv[0][0][1] =
 767             s->last_mv[0][1][1] = mpeg_decode_motion(s, s->mpeg_f_code[0][1],
 768                                                      s->last_mv[0][0][1]);
 769
 770             check_marker(&s->gb, "after concealment_motion_vectors");
 771         } else {
 772             /* reset mv prediction */
 773             memset(s->last_mv, 0, sizeof(s->last_mv));
 774         }
 775         s->mb_intra = 1;
 776         // if 1, we memcpy blocks in xvmcvideo
 777         if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
 778             ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
 779
 780         if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
 781             if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
 782                 for (i = 0; i < 6; i++)
 783                     mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
 784             } else {
 785                 for (i = 0; i < mb_block_count; i++)
 786                     if ((ret = mpeg2_decode_block_intra(s, *s->pblocks[i], i)) < 0)
 787                         return ret;
 788             }
 789         } else {
 790             for (i = 0; i < 6; i++) {
 791                 ret = ff_mpeg1_decode_block_intra(&s->gb,
 792                                                   s->intra_matrix,
 793                                                   s->intra_scantable.permutated,
 794                                                   s->last_dc, *s->pblocks[i],
 795                                                   i, s->qscale);
 796                 if (ret < 0) {
 797                     av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n",
 798                            s->mb_x, s->mb_y);
 799                     return ret;
 800                 }
 801
 802                 s->block_last_index[i] = ret;
 803             }
 804         }
 805     } else {
 806         if (mb_type & MB_TYPE_ZERO_MV) {
 807             av_assert2(mb_type & MB_TYPE_CBP);
 808
 809             s->mv_dir = MV_DIR_FORWARD;
 810             if (s->picture_structure == PICT_FRAME) {
 811                 if (s->picture_structure == PICT_FRAME
 812                     && !s->frame_pred_frame_dct)
 813                     s->interlaced_dct = get_bits1(&s->gb);
 814                 s->mv_type = MV_TYPE_16X16;
 815             } else {
 816                 s->mv_type            = MV_TYPE_FIELD;
 817                 mb_type              |= MB_TYPE_INTERLACED;
 818                 s->field_select[0][0] = s->picture_structure - 1;
 819             }
 820
 821             if (IS_QUANT(mb_type))
 822                 s->qscale = get_qscale(s);
 823
 824             s->last_mv[0][0][0] = 0;
 825             s->last_mv[0][0][1] = 0;
 826             s->last_mv[0][1][0] = 0;
 827             s->last_mv[0][1][1] = 0;
 828             s->mv[0][0][0]      = 0;
 829             s->mv[0][0][1]      = 0;
 830         } else {
 831             av_assert2(mb_type & MB_TYPE_L0L1);
 832             // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
 833             /* get additional motion vector type */
 834             if (s->picture_structure == PICT_FRAME && s->frame_pred_frame_dct) {
 835                 motion_type = MT_FRAME;
 836             } else {
 837                 motion_type = get_bits(&s->gb, 2);
 838                 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
 839                     s->interlaced_dct = get_bits1(&s->gb);
 840             }
 841
 842             if (IS_QUANT(mb_type))
 843                 s->qscale = get_qscale(s);
 844
 845             /* motion vectors */
 846             s->mv_dir = (mb_type >> 13) & 3;
 847             ff_tlog(s->avctx, "motion_type=%d\n", motion_type);
 848             switch (motion_type) {
 849             case MT_FRAME: /* or MT_16X8 */
 850                 if (s->picture_structure == PICT_FRAME) {
 851                     mb_type   |= MB_TYPE_16x16;
 852                     s->mv_type = MV_TYPE_16X16;
 853                     for (i = 0; i < 2; i++) {
 854                         if (USES_LIST(mb_type, i)) {
 855                             /* MT_FRAME */
 856                             s->mv[i][0][0]      =
 857                             s->last_mv[i][0][0] =
 858                             s->last_mv[i][1][0] =
 859                                 mpeg_decode_motion(s, s->mpeg_f_code[i][0],
 860                                                    s->last_mv[i][0][0]);
 861                             s->mv[i][0][1]      =
 862                             s->last_mv[i][0][1] =
 863                             s->last_mv[i][1][1] =
 864                                 mpeg_decode_motion(s, s->mpeg_f_code[i][1],
 865                                                    s->last_mv[i][0][1]);
 866                             /* full_pel: only for MPEG-1 */
 867                             if (s->full_pel[i]) {
 868                                 s->mv[i][0][0] <<= 1;
 869                                 s->mv[i][0][1] <<= 1;
 870                             }
 871                         }
 872                     }
 873                 } else {
 874                     mb_type   |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
 875                     s->mv_type = MV_TYPE_16X8;
 876                     for (i = 0; i < 2; i++) {
 877                         if (USES_LIST(mb_type, i)) {
 878                             /* MT_16X8 */
 879                             for (j = 0; j < 2; j++) {
 880                                 s->field_select[i][j] = get_bits1(&s->gb);
 881                                 for (k = 0; k < 2; k++) {
 882                                     val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
 883                                                              s->last_mv[i][j][k]);
 884                                     s->last_mv[i][j][k] = val;
 885                                     s->mv[i][j][k]      = val;
 886                                 }
 887                             }
 888                         }
 889                     }
 890                 }
 891                 break;
 892             case MT_FIELD:
 893                 s->mv_type = MV_TYPE_FIELD;
 894                 if (s->picture_structure == PICT_FRAME) {
 895                     mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
 896                     for (i = 0; i < 2; i++) {
 897                         if (USES_LIST(mb_type, i)) {
 898                             for (j = 0; j < 2; j++) {
 899                                 s->field_select[i][j] = get_bits1(&s->gb);
 900                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
 901                                                          s->last_mv[i][j][0]);
 902                                 s->last_mv[i][j][0] = val;
 903                                 s->mv[i][j][0]      = val;
 904                                 ff_tlog(s->avctx, "fmx=%d\n", val);
 905                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
 906                                                          s->last_mv[i][j][1] >> 1);
 907                                 s->last_mv[i][j][1] = 2 * val;
 908                                 s->mv[i][j][1]      = val;
 909                                 ff_tlog(s->avctx, "fmy=%d\n", val);
 910                             }
 911                         }
 912                     }
 913                 } else {
 914                     av_assert0(!s->progressive_sequence);
 915                     mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
 916                     for (i = 0; i < 2; i++) {
 917                         if (USES_LIST(mb_type, i)) {
 918                             s->field_select[i][0] = get_bits1(&s->gb);
 919                             for (k = 0; k < 2; k++) {
 920                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
 921                                                          s->last_mv[i][0][k]);
 922                                 s->last_mv[i][0][k] = val;
 923                                 s->last_mv[i][1][k] = val;
 924                                 s->mv[i][0][k]      = val;
 925                             }
 926                         }
 927                     }
 928                 }
 929                 break;
 930             case MT_DMV:
 931                 if (s->progressive_sequence){
 932                     av_log(s->avctx, AV_LOG_ERROR, "MT_DMV in progressive_sequence\n");
 933                     return AVERROR_INVALIDDATA;
 934                 }
 935                 s->mv_type = MV_TYPE_DMV;
 936                 for (i = 0; i < 2; i++) {
 937                     if (USES_LIST(mb_type, i)) {
 938                         int dmx, dmy, mx, my, m;
 939                         const int my_shift = s->picture_structure == PICT_FRAME;
 940
 941                         mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
 942                                                 s->last_mv[i][0][0]);
 943                         s->last_mv[i][0][0] = mx;
 944                         s->last_mv[i][1][0] = mx;
 945                         dmx = get_dmv(s);
 946                         my  = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
 947                                                  s->last_mv[i][0][1] >> my_shift);
 948                         dmy = get_dmv(s);
 949
 950
 951                         s->last_mv[i][0][1] = my << my_shift;
 952                         s->last_mv[i][1][1] = my << my_shift;
 953
 954                         s->mv[i][0][0] = mx;
 955                         s->mv[i][0][1] = my;
 956                         s->mv[i][1][0] = mx; // not used
 957                         s->mv[i][1][1] = my; // not used
 958
 959                         if (s->picture_structure == PICT_FRAME) {
 960                             mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
 961
 962                             // m = 1 + 2 * s->top_field_first;
 963                             m = s->top_field_first ? 1 : 3;
 964
 965                             /* top -> top pred */
 966                             s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
 967                             s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
 968                             m = 4 - m;
 969                             s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
 970                             s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
 971                         } else {
 972                             mb_type |= MB_TYPE_16x16;
 973
 974                             s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
 975                             s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
 976                             if (s->picture_structure == PICT_TOP_FIELD)
 977                                 s->mv[i][2][1]--;
 978                             else
 979                                 s->mv[i][2][1]++;
 980                         }
 981                     }
 982                 }
 983                 break;
 984             default:
 985                 av_log(s->avctx, AV_LOG_ERROR,
 986                        "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
 987                 return AVERROR_INVALIDDATA;
 988             }
 989         }
 990
 991         s->mb_intra = 0;
 992         if (HAS_CBP(mb_type)) {
 993             s->bdsp.clear_blocks(s->block[0]);
 994
 995             cbp = get_vlc2(&s->gb, ff_mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
 996             if (mb_block_count > 6) {
 997                 cbp <<= mb_block_count - 6;
 998                 cbp  |= get_bits(&s->gb, mb_block_count - 6);
 999                 s->bdsp.clear_blocks(s->block[6]);
1000             }
1001             if (cbp <= 0) {
1002                 av_log(s->avctx, AV_LOG_ERROR,
1003                        "invalid cbp %d at %d %d\n", cbp, s->mb_x, s->mb_y);
1004                 return AVERROR_INVALIDDATA;
1005             }
1006
1007             // if 1, we memcpy blocks in xvmcvideo
1008             if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1009                 ff_xvmc_pack_pblocks(s, cbp);
1010
1011             if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
1012                 if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
1013                     for (i = 0; i < 6; i++) {
1014                         if (cbp & 32)
1015                             mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
1016                         else
1017                             s->block_last_index[i] = -1;
1018                         cbp += cbp;
1019                     }
1020                 } else {
1021                     cbp <<= 12 - mb_block_count;
1022
1023                     for (i = 0; i < mb_block_count; i++) {
1024                         if (cbp & (1 << 11)) {
1025                             if ((ret = mpeg2_decode_block_non_intra(s, *s->pblocks[i], i)) < 0)
1026                                 return ret;
1027                         } else {
1028                             s->block_last_index[i] = -1;
1029                         }
1030                         cbp += cbp;
1031                     }
1032                 }
1033             } else {
1034                 if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
1035                     for (i = 0; i < 6; i++) {
1036                         if (cbp & 32)
1037                             mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1038                         else
1039                             s->block_last_index[i] = -1;
1040                         cbp += cbp;
1041                     }
1042                 } else {
1043                     for (i = 0; i < 6; i++) {
1044                         if (cbp & 32) {
1045                             if ((ret = mpeg1_decode_block_inter(s, *s->pblocks[i], i)) < 0)
1046                                 return ret;
1047                         } else {
1048                             s->block_last_index[i] = -1;
1049                         }
1050                         cbp += cbp;
1051                     }
1052                 }
1053             }
1054         } else {
1055             for (i = 0; i < 12; i++)
1056                 s->block_last_index[i] = -1;
1057         }
1058     }
1059
1060     s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1061
1062     return 0;
1063 }
1064
1065 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1066 {
1067     Mpeg1Context *s    = avctx->priv_data;
1068     MpegEncContext *s2 = &s->mpeg_enc_ctx;
1069
1070     ff_mpv_decode_defaults(s2);
1071
1072     if (   avctx->codec_tag != AV_RL32("VCR2")
1073         && avctx->codec_tag != AV_RL32("BW10"))
1074         avctx->coded_width = avctx->coded_height = 0; // do not trust dimensions from input
1075     ff_mpv_decode_init(s2, avctx);
1076
1077     s->mpeg_enc_ctx.avctx  = avctx;
1078
1079     /* we need some permutation to store matrices,
1080      * until the decoder sets the real permutation. */
1081     ff_mpv_idct_init(s2);
1082     ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1083     ff_mpeg12_init_vlcs();
1084
1085     s2->chroma_format              = 1;
1086     s->mpeg_enc_ctx_allocated      = 0;
1087     s->mpeg_enc_ctx.picture_number = 0;
1088     s->repeat_field                = 0;
1089     s->mpeg_enc_ctx.codec_id       = avctx->codec->id;
1090     avctx->color_range             = AVCOL_RANGE_MPEG;
1091     return 0;
1092 }
1093
1094 #if HAVE_THREADS
1095 static int mpeg_decode_update_thread_context(AVCodecContext *avctx,
1096                                              const AVCodecContext *avctx_from)
1097 {
1098     Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1099     MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1100     int err;
1101
1102     if (avctx == avctx_from               ||
1103         !ctx_from->mpeg_enc_ctx_allocated ||
1104         !s1->context_initialized)
1105         return 0;
1106
1107     err = ff_mpeg_update_thread_context(avctx, avctx_from);
1108     if (err)
1109         return err;
1110
1111     if (!ctx->mpeg_enc_ctx_allocated)
1112         memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1113
1114     if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1115         s->picture_number++;
1116
1117     return 0;
1118 }
1119 #endif
1120
1121 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1122                                  const uint8_t *new_perm)
1123 {
1124     uint16_t temp_matrix[64];
1125     int i;
1126
1127     memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1128
1129     for (i = 0; i < 64; i++)
1130         matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1131 }
1132
1133 static const enum AVPixelFormat mpeg1_hwaccel_pixfmt_list_420[] = {
1134 #if CONFIG_MPEG1_XVMC_HWACCEL
1135     AV_PIX_FMT_XVMC,
1136 #endif
1137 #if CONFIG_MPEG1_VDPAU_DECODER && FF_API_VDPAU
1138     AV_PIX_FMT_VDPAU_MPEG1,
1139 #endif
1140 #if CONFIG_MPEG1_VDPAU_HWACCEL
1141     AV_PIX_FMT_VDPAU,
1142 #endif
1143     AV_PIX_FMT_YUV420P,
1144     AV_PIX_FMT_NONE
1145 };
1146
1147 static const enum AVPixelFormat mpeg2_hwaccel_pixfmt_list_420[] = {
1148 #if CONFIG_MPEG2_XVMC_HWACCEL
1149     AV_PIX_FMT_XVMC,
1150 #endif
1151 #if CONFIG_MPEG_VDPAU_DECODER && FF_API_VDPAU
1152     AV_PIX_FMT_VDPAU_MPEG2,
1153 #endif
1154 #if CONFIG_MPEG2_VDPAU_HWACCEL
1155     AV_PIX_FMT_VDPAU,
1156 #endif
1157 #if CONFIG_MPEG2_DXVA2_HWACCEL
1158     AV_PIX_FMT_DXVA2_VLD,
1159 #endif
1160 #if CONFIG_MPEG2_D3D11VA_HWACCEL
1161     AV_PIX_FMT_D3D11VA_VLD,
1162 #endif
1163 #if CONFIG_MPEG2_VAAPI_HWACCEL
1164     AV_PIX_FMT_VAAPI,
1165 #endif
1166 #if CONFIG_MPEG2_VIDEOTOOLBOX_HWACCEL
1167     AV_PIX_FMT_VIDEOTOOLBOX,
1168 #endif
1169     AV_PIX_FMT_YUV420P,
1170     AV_PIX_FMT_NONE
1171 };
1172
1173 static const enum AVPixelFormat mpeg12_pixfmt_list_422[] = {
1174     AV_PIX_FMT_YUV422P,
1175     AV_PIX_FMT_NONE
1176 };
1177
1178 static const enum AVPixelFormat mpeg12_pixfmt_list_444[] = {
1179     AV_PIX_FMT_YUV444P,
1180     AV_PIX_FMT_NONE
1181 };
1182
1183 #if FF_API_VDPAU
1184 static inline int uses_vdpau(AVCodecContext *avctx) {
1185     return avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG1 || avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG2;
1186 }
1187 #endif
1188
1189 static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
1190 {
1191     Mpeg1Context *s1  = avctx->priv_data;
1192     MpegEncContext *s = &s1->mpeg_enc_ctx;
1193     const enum AVPixelFormat *pix_fmts;
1194
1195     if (CONFIG_GRAY && (avctx->flags & AV_CODEC_FLAG_GRAY))
1196         return AV_PIX_FMT_GRAY8;
1197
1198     if (s->chroma_format < 2)
1199         pix_fmts = avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO ?
1200                                 mpeg1_hwaccel_pixfmt_list_420 :
1201                                 mpeg2_hwaccel_pixfmt_list_420;
1202     else if (s->chroma_format == 2)
1203         pix_fmts = mpeg12_pixfmt_list_422;
1204     else
1205         pix_fmts = mpeg12_pixfmt_list_444;
1206
1207     return ff_thread_get_format(avctx, pix_fmts);
1208 }
1209
1210 static void setup_hwaccel_for_pixfmt(AVCodecContext *avctx)
1211 {
1212     // until then pix_fmt may be changed right after codec init
1213     if (avctx->hwaccel
1214 #if FF_API_VDPAU
1215         || uses_vdpau(avctx)
1216 #endif
1217         )
1218         if (avctx->idct_algo == FF_IDCT_AUTO)
1219             avctx->idct_algo = FF_IDCT_SIMPLE;
1220
1221     if (avctx->hwaccel && avctx->pix_fmt == AV_PIX_FMT_XVMC) {
1222         Mpeg1Context *s1 = avctx->priv_data;
1223         MpegEncContext *s = &s1->mpeg_enc_ctx;
1224
1225         s->pack_pblocks = 1;
1226 #if FF_API_XVMC
1227 FF_DISABLE_DEPRECATION_WARNINGS
1228         avctx->xvmc_acceleration = 2;
1229 FF_ENABLE_DEPRECATION_WARNINGS
1230 #endif /* FF_API_XVMC */
1231     }
1232 }
1233
1234 /* Call this function when we know all parameters.
1235  * It may be called in different places for MPEG-1 and MPEG-2. */
1236 static int mpeg_decode_postinit(AVCodecContext *avctx)
1237 {
1238     Mpeg1Context *s1  = avctx->priv_data;
1239     MpegEncContext *s = &s1->mpeg_enc_ctx;
1240     uint8_t old_permutation[64];
1241     int ret;
1242
1243     if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1244         // MPEG-1 aspect
1245         avctx->sample_aspect_ratio = av_d2q(1.0 / ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1246     } else { // MPEG-2
1247         // MPEG-2 aspect
1248         if (s->aspect_ratio_info > 1) {
1249             AVRational dar =
1250                 av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1251                                   (AVRational) { s1->pan_scan.width,
1252                                                  s1->pan_scan.height }),
1253                          (AVRational) { s->width, s->height });
1254
1255             /* We ignore the spec here and guess a bit as reality does not
1256              * match the spec, see for example res_change_ffmpeg_aspect.ts
1257              * and sequence-display-aspect.mpg.
1258              * issue1613, 621, 562 */
1259             if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1260                 (av_cmp_q(dar, (AVRational) { 4, 3 }) &&
1261                  av_cmp_q(dar, (AVRational) { 16, 9 }))) {
1262                 s->avctx->sample_aspect_ratio =
1263                     av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1264                              (AVRational) { s->width, s->height });
1265             } else {
1266                 s->avctx->sample_aspect_ratio =
1267                     av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1268                              (AVRational) { s1->pan_scan.width, s1->pan_scan.height });
1269 // issue1613 4/3 16/9 -> 16/9
1270 // res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1271 // widescreen-issue562.mpg 4/3 16/9 -> 16/9
1272 //                s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1273                 ff_dlog(avctx, "aspect A %d/%d\n",
1274                         ff_mpeg2_aspect[s->aspect_ratio_info].num,
1275                         ff_mpeg2_aspect[s->aspect_ratio_info].den);
1276                 ff_dlog(avctx, "aspect B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1277                         s->avctx->sample_aspect_ratio.den);
1278             }
1279         } else {
1280             s->avctx->sample_aspect_ratio =
1281                 ff_mpeg2_aspect[s->aspect_ratio_info];
1282         }
1283     } // MPEG-2
1284
1285     if (av_image_check_sar(s->width, s->height,
1286                            avctx->sample_aspect_ratio) < 0) {
1287         av_log(avctx, AV_LOG_WARNING, "ignoring invalid SAR: %u/%u\n",
1288                 avctx->sample_aspect_ratio.num,
1289                 avctx->sample_aspect_ratio.den);
1290         avctx->sample_aspect_ratio = (AVRational){ 0, 1 };
1291     }
1292
1293     if ((s1->mpeg_enc_ctx_allocated == 0)                   ||
1294         avctx->coded_width       != s->width                ||
1295         avctx->coded_height      != s->height               ||
1296         s1->save_width           != s->width                ||
1297         s1->save_height          != s->height               ||
1298         av_cmp_q(s1->save_aspect, s->avctx->sample_aspect_ratio) ||
1299         (s1->save_progressive_seq != s->progressive_sequence && FFALIGN(s->height, 16) != FFALIGN(s->height, 32)) ||
1300         0) {
1301         if (s1->mpeg_enc_ctx_allocated) {
1302             ParseContext pc = s->parse_context;
1303             s->parse_context.buffer = 0;
1304             ff_mpv_common_end(s);
1305             s->parse_context = pc;
1306             s1->mpeg_enc_ctx_allocated = 0;
1307         }
1308
1309         ret = ff_set_dimensions(avctx, s->width, s->height);
1310         if (ret < 0)
1311             return ret;
1312
1313         if (avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->bit_rate) {
1314             avctx->rc_max_rate = s->bit_rate;
1315         } else if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && s->bit_rate &&
1316                    (s->bit_rate != 0x3FFFF*400 || s->vbv_delay != 0xFFFF)) {
1317             avctx->bit_rate = s->bit_rate;
1318         }
1319         s1->save_aspect          = s->avctx->sample_aspect_ratio;
1320         s1->save_width           = s->width;
1321         s1->save_height          = s->height;
1322         s1->save_progressive_seq = s->progressive_sequence;
1323
1324         /* low_delay may be forced, in this case we will have B-frames
1325          * that behave like P-frames. */
1326         avctx->has_b_frames = !s->low_delay;
1327
1328         if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1329             // MPEG-1 fps
1330             avctx->framerate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
1331             avctx->ticks_per_frame     = 1;
1332
1333             avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1334         } else { // MPEG-2
1335             // MPEG-2 fps
1336             av_reduce(&s->avctx->framerate.num,
1337                       &s->avctx->framerate.den,
1338                       ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
1339                       ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1340                       1 << 30);
1341             avctx->ticks_per_frame = 2;
1342
1343             switch (s->chroma_format) {
1344             case 1: avctx->chroma_sample_location = AVCHROMA_LOC_LEFT; break;
1345             case 2:
1346             case 3: avctx->chroma_sample_location = AVCHROMA_LOC_TOPLEFT; break;
1347             default: av_assert0(0);
1348             }
1349         } // MPEG-2
1350
1351         avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1352         setup_hwaccel_for_pixfmt(avctx);
1353
1354         /* Quantization matrices may need reordering
1355          * if DCT permutation is changed. */
1356         memcpy(old_permutation, s->idsp.idct_permutation, 64 * sizeof(uint8_t));
1357
1358         ff_mpv_idct_init(s);
1359         if ((ret = ff_mpv_common_init(s)) < 0)
1360             return ret;
1361
1362         quant_matrix_rebuild(s->intra_matrix,        old_permutation, s->idsp.idct_permutation);
1363         quant_matrix_rebuild(s->inter_matrix,        old_permutation, s->idsp.idct_permutation);
1364         quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->idsp.idct_permutation);
1365         quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->idsp.idct_permutation);
1366
1367         s1->mpeg_enc_ctx_allocated = 1;
1368     }
1369     return 0;
1370 }
1371
1372 static int mpeg1_decode_picture(AVCodecContext *avctx, const uint8_t *buf,
1373                                 int buf_size)
1374 {
1375     Mpeg1Context *s1  = avctx->priv_data;
1376     MpegEncContext *s = &s1->mpeg_enc_ctx;
1377     int ref, f_code, vbv_delay;
1378
1379     init_get_bits(&s->gb, buf, buf_size * 8);
1380
1381     ref = get_bits(&s->gb, 10); /* temporal ref */
1382     s->pict_type = get_bits(&s->gb, 3);
1383     if (s->pict_type == 0 || s->pict_type > 3)
1384         return AVERROR_INVALIDDATA;
1385
1386     vbv_delay = get_bits(&s->gb, 16);
1387     s->vbv_delay = vbv_delay;
1388     if (s->pict_type == AV_PICTURE_TYPE_P ||
1389         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 AVERROR_INVALIDDATA;
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 AVERROR_INVALIDDATA;
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,
1412                "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1413
1414     s->y_dc_scale = 8;
1415     s->c_dc_scale = 8;
1416     return 0;
1417 }
1418
1419 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1420 {
1421     MpegEncContext *s = &s1->mpeg_enc_ctx;
1422     int horiz_size_ext, vert_size_ext;
1423     int bit_rate_ext;
1424
1425     skip_bits(&s->gb, 1); /* profile and level esc*/
1426     s->avctx->profile       = get_bits(&s->gb, 3);
1427     s->avctx->level         = get_bits(&s->gb, 4);
1428     s->progressive_sequence = get_bits1(&s->gb);   /* progressive_sequence */
1429     s->chroma_format        = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1430
1431     if (!s->chroma_format) {
1432         s->chroma_format = 1;
1433         av_log(s->avctx, AV_LOG_WARNING, "Chroma format invalid\n");
1434     }
1435
1436     horiz_size_ext          = get_bits(&s->gb, 2);
1437     vert_size_ext           = get_bits(&s->gb, 2);
1438     s->width  |= (horiz_size_ext << 12);
1439     s->height |= (vert_size_ext  << 12);
1440     bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1441     s->bit_rate += (bit_rate_ext << 18) * 400LL;
1442     check_marker(&s->gb, "after bit rate extension");
1443     s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1444
1445     s->low_delay = get_bits1(&s->gb);
1446     if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
1447         s->low_delay = 1;
1448
1449     s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1450     s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1451
1452     ff_dlog(s->avctx, "sequence extension\n");
1453     s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1454
1455     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1456         av_log(s->avctx, AV_LOG_DEBUG,
1457                "profile: %d, level: %d ps: %d cf:%d vbv buffer: %d, bitrate:%"PRId64"\n",
1458                s->avctx->profile, s->avctx->level, s->progressive_sequence, s->chroma_format,
1459                s->avctx->rc_buffer_size, s->bit_rate);
1460 }
1461
1462 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1463 {
1464     MpegEncContext *s = &s1->mpeg_enc_ctx;
1465     int color_description, w, h;
1466
1467     skip_bits(&s->gb, 3); /* video format */
1468     color_description = get_bits1(&s->gb);
1469     if (color_description) {
1470         s->avctx->color_primaries = get_bits(&s->gb, 8);
1471         s->avctx->color_trc       = get_bits(&s->gb, 8);
1472         s->avctx->colorspace      = get_bits(&s->gb, 8);
1473     }
1474     w = get_bits(&s->gb, 14);
1475     skip_bits(&s->gb, 1); // marker
1476     h = get_bits(&s->gb, 14);
1477     // remaining 3 bits are zero padding
1478
1479     s1->pan_scan.width  = 16 * w;
1480     s1->pan_scan.height = 16 * h;
1481
1482     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1483         av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1484 }
1485
1486 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1487 {
1488     MpegEncContext *s = &s1->mpeg_enc_ctx;
1489     int i, nofco;
1490
1491     nofco = 1;
1492     if (s->progressive_sequence) {
1493         if (s->repeat_first_field) {
1494             nofco++;
1495             if (s->top_field_first)
1496                 nofco++;
1497         }
1498     } else {
1499         if (s->picture_structure == PICT_FRAME) {
1500             nofco++;
1501             if (s->repeat_first_field)
1502                 nofco++;
1503         }
1504     }
1505     for (i = 0; i < nofco; i++) {
1506         s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1507         skip_bits(&s->gb, 1); // marker
1508         s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1509         skip_bits(&s->gb, 1); // marker
1510     }
1511
1512     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1513         av_log(s->avctx, AV_LOG_DEBUG,
1514                "pde (%"PRId16",%"PRId16") (%"PRId16",%"PRId16") (%"PRId16",%"PRId16")\n",
1515                s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1516                s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1517                s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1518 }
1519
1520 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64],
1521                        uint16_t matrix1[64], int intra)
1522 {
1523     int i;
1524
1525     for (i = 0; i < 64; i++) {
1526         int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1527         int v = get_bits(&s->gb, 8);
1528         if (v == 0) {
1529             av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1530             return AVERROR_INVALIDDATA;
1531         }
1532         if (intra && i == 0 && v != 8) {
1533             av_log(s->avctx, AV_LOG_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v);
1534             v = 8; // needed by pink.mpg / issue1046
1535         }
1536         matrix0[j] = v;
1537         if (matrix1)
1538             matrix1[j] = v;
1539     }
1540     return 0;
1541 }
1542
1543 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1544 {
1545     ff_dlog(s->avctx, "matrix extension\n");
1546
1547     if (get_bits1(&s->gb))
1548         load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1549     if (get_bits1(&s->gb))
1550         load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1551     if (get_bits1(&s->gb))
1552         load_matrix(s, s->chroma_intra_matrix, NULL, 1);
1553     if (get_bits1(&s->gb))
1554         load_matrix(s, s->chroma_inter_matrix, NULL, 0);
1555 }
1556
1557 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1558 {
1559     MpegEncContext *s = &s1->mpeg_enc_ctx;
1560
1561     s->full_pel[0]       = s->full_pel[1] = 0;
1562     s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1563     s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1564     s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1565     s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1566     if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1567         av_log(s->avctx, AV_LOG_ERROR,
1568                "Missing picture start code, guessing missing values\n");
1569         if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1570             if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1571                 s->pict_type = AV_PICTURE_TYPE_I;
1572             else
1573                 s->pict_type = AV_PICTURE_TYPE_P;
1574         } else
1575             s->pict_type = AV_PICTURE_TYPE_B;
1576         s->current_picture.f->pict_type = s->pict_type;
1577         s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1578     }
1579     s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0];
1580     s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1];
1581     s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0];
1582     s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1];
1583
1584     s->intra_dc_precision         = get_bits(&s->gb, 2);
1585     s->picture_structure          = get_bits(&s->gb, 2);
1586     s->top_field_first            = get_bits1(&s->gb);
1587     s->frame_pred_frame_dct       = get_bits1(&s->gb);
1588     s->concealment_motion_vectors = get_bits1(&s->gb);
1589     s->q_scale_type               = get_bits1(&s->gb);
1590     s->intra_vlc_format           = get_bits1(&s->gb);
1591     s->alternate_scan             = get_bits1(&s->gb);
1592     s->repeat_first_field         = get_bits1(&s->gb);
1593     s->chroma_420_type            = get_bits1(&s->gb);
1594     s->progressive_frame          = get_bits1(&s->gb);
1595
1596     if (s->alternate_scan) {
1597         ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1598         ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1599     } else {
1600         ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1601         ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1602     }
1603
1604     /* composite display not parsed */
1605     ff_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1606     ff_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1607     ff_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1608     ff_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1609     ff_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1610     ff_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1611     ff_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1612     ff_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1613     ff_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1614 }
1615
1616 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1617 {
1618     AVCodecContext *avctx = s->avctx;
1619     Mpeg1Context *s1      = (Mpeg1Context *) s;
1620     int ret;
1621
1622     /* start frame decoding */
1623     if (s->first_field || s->picture_structure == PICT_FRAME) {
1624         AVFrameSideData *pan_scan;
1625
1626         if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
1627             return ret;
1628
1629         ff_mpeg_er_frame_start(s);
1630
1631         /* first check if we must repeat the frame */
1632         s->current_picture_ptr->f->repeat_pict = 0;
1633         if (s->repeat_first_field) {
1634             if (s->progressive_sequence) {
1635                 if (s->top_field_first)
1636                     s->current_picture_ptr->f->repeat_pict = 4;
1637                 else
1638                     s->current_picture_ptr->f->repeat_pict = 2;
1639             } else if (s->progressive_frame) {
1640                 s->current_picture_ptr->f->repeat_pict = 1;
1641             }
1642         }
1643
1644         pan_scan = av_frame_new_side_data(s->current_picture_ptr->f,
1645                                           AV_FRAME_DATA_PANSCAN,
1646                                           sizeof(s1->pan_scan));
1647         if (!pan_scan)
1648             return AVERROR(ENOMEM);
1649         memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
1650
1651         if (s1->a53_caption) {
1652             AVFrameSideData *sd = av_frame_new_side_data(
1653                 s->current_picture_ptr->f, AV_FRAME_DATA_A53_CC,
1654                 s1->a53_caption_size);
1655             if (sd)
1656                 memcpy(sd->data, s1->a53_caption, s1->a53_caption_size);
1657             av_freep(&s1->a53_caption);
1658             avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
1659         }
1660
1661         if (s1->has_stereo3d) {
1662             AVStereo3D *stereo = av_stereo3d_create_side_data(s->current_picture_ptr->f);
1663             if (!stereo)
1664                 return AVERROR(ENOMEM);
1665
1666             *stereo = s1->stereo3d;
1667             s1->has_stereo3d = 0;
1668         }
1669
1670         if (s1->has_afd) {
1671             AVFrameSideData *sd =
1672                 av_frame_new_side_data(s->current_picture_ptr->f,
1673                                        AV_FRAME_DATA_AFD, 1);
1674             if (!sd)
1675                 return AVERROR(ENOMEM);
1676
1677             *sd->data   = s1->afd;
1678             s1->has_afd = 0;
1679         }
1680
1681         if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1682             ff_thread_finish_setup(avctx);
1683     } else { // second field
1684         int i;
1685
1686         if (!s->current_picture_ptr) {
1687             av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1688             return AVERROR_INVALIDDATA;
1689         }
1690
1691         if (s->avctx->hwaccel &&
1692             (s->avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
1693             if ((ret = s->avctx->hwaccel->end_frame(s->avctx)) < 0) {
1694                 av_log(avctx, AV_LOG_ERROR,
1695                        "hardware accelerator failed to decode first field\n");
1696                 return ret;
1697             }
1698         }
1699
1700         for (i = 0; i < 4; i++) {
1701             s->current_picture.f->data[i] = s->current_picture_ptr->f->data[i];
1702             if (s->picture_structure == PICT_BOTTOM_FIELD)
1703                 s->current_picture.f->data[i] +=
1704                     s->current_picture_ptr->f->linesize[i];
1705         }
1706     }
1707
1708     if (avctx->hwaccel) {
1709         if ((ret = avctx->hwaccel->start_frame(avctx, buf, buf_size)) < 0)
1710             return ret;
1711     }
1712
1713     return 0;
1714 }
1715
1716 #define DECODE_SLICE_ERROR -1
1717 #define DECODE_SLICE_OK     0
1718
1719 /**
1720  * Decode a slice.
1721  * MpegEncContext.mb_y must be set to the MB row from the startcode.
1722  * @return DECODE_SLICE_ERROR if the slice is damaged,
1723  *         DECODE_SLICE_OK if this slice is OK
1724  */
1725 static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1726                              const uint8_t **buf, int buf_size)
1727 {
1728     AVCodecContext *avctx = s->avctx;
1729     const int lowres      = s->avctx->lowres;
1730     const int field_pic   = s->picture_structure != PICT_FRAME;
1731     int ret;
1732
1733     s->resync_mb_x =
1734     s->resync_mb_y = -1;
1735
1736     av_assert0(mb_y < s->mb_height);
1737
1738     init_get_bits(&s->gb, *buf, buf_size * 8);
1739     if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1740         skip_bits(&s->gb, 3);
1741
1742     ff_mpeg1_clean_buffers(s);
1743     s->interlaced_dct = 0;
1744
1745     s->qscale = get_qscale(s);
1746
1747     if (s->qscale == 0) {
1748         av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1749         return AVERROR_INVALIDDATA;
1750     }
1751
1752     /* extra slice info */
1753     if (skip_1stop_8data_bits(&s->gb) < 0)
1754         return AVERROR_INVALIDDATA;
1755
1756     s->mb_x = 0;
1757
1758     if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1759         skip_bits1(&s->gb);
1760     } else {
1761         while (get_bits_left(&s->gb) > 0) {
1762             int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1763                                 MBINCR_VLC_BITS, 2);
1764             if (code < 0) {
1765                 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1766                 return AVERROR_INVALIDDATA;
1767             }
1768             if (code >= 33) {
1769                 if (code == 33)
1770                     s->mb_x += 33;
1771                 /* otherwise, stuffing, nothing to do */
1772             } else {
1773                 s->mb_x += code;
1774                 break;
1775             }
1776         }
1777     }
1778
1779     if (s->mb_x >= (unsigned) s->mb_width) {
1780         av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1781         return AVERROR_INVALIDDATA;
1782     }
1783
1784     if (avctx->hwaccel && avctx->hwaccel->decode_slice) {
1785         const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1786         int start_code = -1;
1787         buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1788         if (buf_end < *buf + buf_size)
1789             buf_end -= 4;
1790         s->mb_y = mb_y;
1791         if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1792             return DECODE_SLICE_ERROR;
1793         *buf = buf_end;
1794         return DECODE_SLICE_OK;
1795     }
1796
1797     s->resync_mb_x = s->mb_x;
1798     s->resync_mb_y = s->mb_y = mb_y;
1799     s->mb_skip_run = 0;
1800     ff_init_block_index(s);
1801
1802     if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1803         if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1804             av_log(s->avctx, AV_LOG_DEBUG,
1805                    "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",
1806                    s->qscale,
1807                    s->mpeg_f_code[0][0], s->mpeg_f_code[0][1],
1808                    s->mpeg_f_code[1][0], s->mpeg_f_code[1][1],
1809                    s->pict_type  == AV_PICTURE_TYPE_I ? "I" :
1810                    (s->pict_type == AV_PICTURE_TYPE_P ? "P" :
1811                    (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
1812                    s->progressive_sequence ? "ps"  : "",
1813                    s->progressive_frame    ? "pf"  : "",
1814                    s->alternate_scan       ? "alt" : "",
1815                    s->top_field_first      ? "top" : "",
1816                    s->intra_dc_precision, s->picture_structure,
1817                    s->frame_pred_frame_dct, s->concealment_motion_vectors,
1818                    s->q_scale_type, s->intra_vlc_format,
1819                    s->repeat_first_field, s->chroma_420_type ? "420" : "");
1820         }
1821     }
1822
1823     for (;;) {
1824         // If 1, we memcpy blocks in xvmcvideo.
1825         if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1826             ff_xvmc_init_block(s); // set s->block
1827
1828         if ((ret = mpeg_decode_mb(s, s->block)) < 0)
1829             return ret;
1830
1831         // Note motion_val is normally NULL unless we want to extract the MVs.
1832         if (s->current_picture.motion_val[0] && !s->encoding) {
1833             const int wrap = s->b8_stride;
1834             int xy         = s->mb_x * 2 + s->mb_y * 2 * wrap;
1835             int b8_xy      = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1836             int motion_x, motion_y, dir, i;
1837
1838             for (i = 0; i < 2; i++) {
1839                 for (dir = 0; dir < 2; dir++) {
1840                     if (s->mb_intra ||
1841                         (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1842                         motion_x = motion_y = 0;
1843                     } else if (s->mv_type == MV_TYPE_16X16 ||
1844                                (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1845                         motion_x = s->mv[dir][0][0];
1846                         motion_y = s->mv[dir][0][1];
1847                     } else { /* if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8)) */
1848                         motion_x = s->mv[dir][i][0];
1849                         motion_y = s->mv[dir][i][1];
1850                     }
1851
1852                     s->current_picture.motion_val[dir][xy][0]     = motion_x;
1853                     s->current_picture.motion_val[dir][xy][1]     = motion_y;
1854                     s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1855                     s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1856                     s->current_picture.ref_index [dir][b8_xy]     =
1857                     s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1858                     av_assert2(s->field_select[dir][i] == 0 ||
1859                                s->field_select[dir][i] == 1);
1860                 }
1861                 xy    += wrap;
1862                 b8_xy += 2;
1863             }
1864         }
1865
1866         s->dest[0] += 16 >> lowres;
1867         s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1868         s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1869
1870         ff_mpv_decode_mb(s, s->block);
1871
1872         if (++s->mb_x >= s->mb_width) {
1873             const int mb_size = 16 >> s->avctx->lowres;
1874             int left;
1875
1876             ff_mpeg_draw_horiz_band(s, mb_size * (s->mb_y >> field_pic), mb_size);
1877             ff_mpv_report_decode_progress(s);
1878
1879             s->mb_x  = 0;
1880             s->mb_y += 1 << field_pic;
1881
1882             if (s->mb_y >= s->mb_height) {
1883                 int left   = get_bits_left(&s->gb);
1884                 int is_d10 = s->chroma_format == 2 &&
1885                              s->pict_type == AV_PICTURE_TYPE_I &&
1886                              avctx->profile == 0 && avctx->level == 5 &&
1887                              s->intra_dc_precision == 2 &&
1888                              s->q_scale_type == 1 && s->alternate_scan == 0 &&
1889                              s->progressive_frame == 0
1890                              /* vbv_delay == 0xBBB || 0xE10 */;
1891
1892                 if (left >= 32 && !is_d10) {
1893                     GetBitContext gb = s->gb;
1894                     align_get_bits(&gb);
1895                     if (show_bits(&gb, 24) == 0x060E2B) {
1896                         av_log(avctx, AV_LOG_DEBUG, "Invalid MXF data found in video stream\n");
1897                         is_d10 = 1;
1898                     }
1899                 }
1900
1901                 if (left < 0 ||
1902                     (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10) ||
1903                     ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
1904                     av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n",
1905                            left, left>0 ? show_bits(&s->gb, FFMIN(left, 23)) : 0);
1906                     return AVERROR_INVALIDDATA;
1907                 } else
1908                     goto eos;
1909             }
1910             // There are some files out there which are missing the last slice
1911             // in cases where the slice is completely outside the visible
1912             // area, we detect this here instead of running into the end expecting
1913             // more data
1914             left = get_bits_left(&s->gb);
1915             if (s->mb_y >= ((s->height + 15) >> 4) &&
1916                 !s->progressive_sequence &&
1917                 left <= 25 &&
1918                 left >= 0 &&
1919                 s->mb_skip_run == -1 &&
1920                 (!left || show_bits(&s->gb, left) == 0))
1921                 goto eos;
1922
1923             ff_init_block_index(s);
1924         }
1925
1926         /* skip mb handling */
1927         if (s->mb_skip_run == -1) {
1928             /* read increment again */
1929             s->mb_skip_run = 0;
1930             for (;;) {
1931                 int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1932                                     MBINCR_VLC_BITS, 2);
1933                 if (code < 0) {
1934                     av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1935                     return AVERROR_INVALIDDATA;
1936                 }
1937                 if (code >= 33) {
1938                     if (code == 33) {
1939                         s->mb_skip_run += 33;
1940                     } else if (code == 35) {
1941                         if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1942                             av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1943                             return AVERROR_INVALIDDATA;
1944                         }
1945                         goto eos; /* end of slice */
1946                     }
1947                     /* otherwise, stuffing, nothing to do */
1948                 } else {
1949                     s->mb_skip_run += code;
1950                     break;
1951                 }
1952             }
1953             if (s->mb_skip_run) {
1954                 int i;
1955                 if (s->pict_type == AV_PICTURE_TYPE_I) {
1956                     av_log(s->avctx, AV_LOG_ERROR,
1957                            "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1958                     return AVERROR_INVALIDDATA;
1959                 }
1960
1961                 /* skip mb */
1962                 s->mb_intra = 0;
1963                 for (i = 0; i < 12; i++)
1964                     s->block_last_index[i] = -1;
1965                 if (s->picture_structure == PICT_FRAME)
1966                     s->mv_type = MV_TYPE_16X16;
1967                 else
1968                     s->mv_type = MV_TYPE_FIELD;
1969                 if (s->pict_type == AV_PICTURE_TYPE_P) {
1970                     /* if P type, zero motion vector is implied */
1971                     s->mv_dir             = MV_DIR_FORWARD;
1972                     s->mv[0][0][0]        = s->mv[0][0][1]      = 0;
1973                     s->last_mv[0][0][0]   = s->last_mv[0][0][1] = 0;
1974                     s->last_mv[0][1][0]   = s->last_mv[0][1][1] = 0;
1975                     s->field_select[0][0] = (s->picture_structure - 1) & 1;
1976                 } else {
1977                     /* if B type, reuse previous vectors and directions */
1978                     s->mv[0][0][0] = s->last_mv[0][0][0];
1979                     s->mv[0][0][1] = s->last_mv[0][0][1];
1980                     s->mv[1][0][0] = s->last_mv[1][0][0];
1981                     s->mv[1][0][1] = s->last_mv[1][0][1];
1982                 }
1983             }
1984         }
1985     }
1986 eos: // end of slice
1987     if (get_bits_left(&s->gb) < 0) {
1988         av_log(s, AV_LOG_ERROR, "overread %d\n", -get_bits_left(&s->gb));
1989         return AVERROR_INVALIDDATA;
1990     }
1991     *buf += (get_bits_count(&s->gb) - 1) / 8;
1992     ff_dlog(s, "Slice start:%d %d  end:%d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1993     return 0;
1994 }
1995
1996 static int slice_decode_thread(AVCodecContext *c, void *arg)
1997 {
1998     MpegEncContext *s   = *(void **) arg;
1999     const uint8_t *buf  = s->gb.buffer;
2000     int mb_y            = s->start_mb_y;
2001     const int field_pic = s->picture_structure != PICT_FRAME;
2002
2003     s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
2004
2005     for (;;) {
2006         uint32_t start_code;
2007         int ret;
2008
2009         ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
2010         emms_c();
2011         ff_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
2012                 ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
2013                 s->start_mb_y, s->end_mb_y, s->er.error_count);
2014         if (ret < 0) {
2015             if (c->err_recognition & AV_EF_EXPLODE)
2016                 return ret;
2017             if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
2018                 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2019                                 s->mb_x, s->mb_y,
2020                                 ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2021         } else {
2022             ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2023                             s->mb_x - 1, s->mb_y,
2024                             ER_AC_END | ER_DC_END | ER_MV_END);
2025         }
2026
2027         if (s->mb_y == s->end_mb_y)
2028             return 0;
2029
2030         start_code = -1;
2031         buf        = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
2032         mb_y       = start_code - SLICE_MIN_START_CODE;
2033         if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
2034             mb_y += (*buf&0xE0)<<2;
2035         mb_y <<= field_pic;
2036         if (s->picture_structure == PICT_BOTTOM_FIELD)
2037             mb_y++;
2038         if (mb_y < 0 || mb_y >= s->end_mb_y)
2039             return AVERROR_INVALIDDATA;
2040     }
2041 }
2042
2043 /**
2044  * Handle slice ends.
2045  * @return 1 if it seems to be the last slice
2046  */
2047 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2048 {
2049     Mpeg1Context *s1  = avctx->priv_data;
2050     MpegEncContext *s = &s1->mpeg_enc_ctx;
2051
2052     if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2053         return 0;
2054
2055     if (s->avctx->hwaccel) {
2056         int ret = s->avctx->hwaccel->end_frame(s->avctx);
2057         if (ret < 0) {
2058             av_log(avctx, AV_LOG_ERROR,
2059                    "hardware accelerator failed to decode picture\n");
2060             return ret;
2061         }
2062     }
2063
2064     /* end of slice reached */
2065     if (/* s->mb_y << field_pic == s->mb_height && */ !s->first_field && !s1->first_slice) {
2066         /* end of image */
2067
2068         ff_er_frame_end(&s->er);
2069
2070         ff_mpv_frame_end(s);
2071
2072         if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
2073             int ret = av_frame_ref(pict, s->current_picture_ptr->f);
2074             if (ret < 0)
2075                 return ret;
2076             ff_print_debug_info(s, s->current_picture_ptr, pict);
2077             ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2078         } else {
2079             if (avctx->active_thread_type & FF_THREAD_FRAME)
2080                 s->picture_number++;
2081             /* latency of 1 frame for I- and P-frames */
2082             /* XXX: use another variable than picture_number */
2083             if (s->last_picture_ptr) {
2084                 int ret = av_frame_ref(pict, s->last_picture_ptr->f);
2085                 if (ret < 0)
2086                     return ret;
2087                 ff_print_debug_info(s, s->last_picture_ptr, pict);
2088                 ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2089             }
2090         }
2091
2092         return 1;
2093     } else {
2094         return 0;
2095     }
2096 }
2097
2098 static int mpeg1_decode_sequence(AVCodecContext *avctx,
2099                                  const uint8_t *buf, int buf_size)
2100 {
2101     Mpeg1Context *s1  = avctx->priv_data;
2102     MpegEncContext *s = &s1->mpeg_enc_ctx;
2103     int width, height;
2104     int i, v, j;
2105
2106     init_get_bits(&s->gb, buf, buf_size * 8);
2107
2108     width  = get_bits(&s->gb, 12);
2109     height = get_bits(&s->gb, 12);
2110     if (width == 0 || height == 0) {
2111         av_log(avctx, AV_LOG_WARNING,
2112                "Invalid horizontal or vertical size value.\n");
2113         if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2114             return AVERROR_INVALIDDATA;
2115     }
2116     s->aspect_ratio_info = get_bits(&s->gb, 4);
2117     if (s->aspect_ratio_info == 0) {
2118         av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2119         if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2120             return AVERROR_INVALIDDATA;
2121     }
2122     s->frame_rate_index = get_bits(&s->gb, 4);
2123     if (s->frame_rate_index == 0 || s->frame_rate_index > 13) {
2124         av_log(avctx, AV_LOG_WARNING,
2125                "frame_rate_index %d is invalid\n", s->frame_rate_index);
2126         s->frame_rate_index = 1;
2127     }
2128     s->bit_rate = get_bits(&s->gb, 18) * 400LL;
2129     if (check_marker(&s->gb, "in sequence header") == 0) {
2130         return AVERROR_INVALIDDATA;
2131     }
2132
2133     s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2134     skip_bits(&s->gb, 1);
2135
2136     /* get matrix */
2137     if (get_bits1(&s->gb)) {
2138         load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2139     } else {
2140         for (i = 0; i < 64; i++) {
2141             j = s->idsp.idct_permutation[i];
2142             v = ff_mpeg1_default_intra_matrix[i];
2143             s->intra_matrix[j]        = v;
2144             s->chroma_intra_matrix[j] = v;
2145         }
2146     }
2147     if (get_bits1(&s->gb)) {
2148         load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2149     } else {
2150         for (i = 0; i < 64; i++) {
2151             int j = s->idsp.idct_permutation[i];
2152             v = ff_mpeg1_default_non_intra_matrix[i];
2153             s->inter_matrix[j]        = v;
2154             s->chroma_inter_matrix[j] = v;
2155         }
2156     }
2157
2158     if (show_bits(&s->gb, 23) != 0) {
2159         av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2160         return AVERROR_INVALIDDATA;
2161     }
2162
2163     s->width  = width;
2164     s->height = height;
2165
2166     /* We set MPEG-2 parameters so that it emulates MPEG-1. */
2167     s->progressive_sequence = 1;
2168     s->progressive_frame    = 1;
2169     s->picture_structure    = PICT_FRAME;
2170     s->first_field          = 0;
2171     s->frame_pred_frame_dct = 1;
2172     s->chroma_format        = 1;
2173     s->codec_id             =
2174     s->avctx->codec_id      = AV_CODEC_ID_MPEG1VIDEO;
2175     s->out_format           = FMT_MPEG1;
2176     s->swap_uv              = 0; // AFAIK VCR2 does not have SEQ_HEADER
2177     if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
2178         s->low_delay = 1;
2179
2180     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2181         av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%"PRId64", aspect_ratio_info: %d \n",
2182                s->avctx->rc_buffer_size, s->bit_rate, s->aspect_ratio_info);
2183
2184     return 0;
2185 }
2186
2187 static int vcr2_init_sequence(AVCodecContext *avctx)
2188 {
2189     Mpeg1Context *s1  = avctx->priv_data;
2190     MpegEncContext *s = &s1->mpeg_enc_ctx;
2191     int i, v, ret;
2192
2193     /* start new MPEG-1 context decoding */
2194     s->out_format = FMT_MPEG1;
2195     if (s1->mpeg_enc_ctx_allocated) {
2196         ff_mpv_common_end(s);
2197         s1->mpeg_enc_ctx_allocated = 0;
2198     }
2199     s->width            = avctx->coded_width;
2200     s->height           = avctx->coded_height;
2201     avctx->has_b_frames = 0; // true?
2202     s->low_delay        = 1;
2203
2204     avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2205     setup_hwaccel_for_pixfmt(avctx);
2206
2207     ff_mpv_idct_init(s);
2208     if ((ret = ff_mpv_common_init(s)) < 0)
2209         return ret;
2210     s1->mpeg_enc_ctx_allocated = 1;
2211
2212     for (i = 0; i < 64; i++) {
2213         int j = s->idsp.idct_permutation[i];
2214         v = ff_mpeg1_default_intra_matrix[i];
2215         s->intra_matrix[j]        = v;
2216         s->chroma_intra_matrix[j] = v;
2217
2218         v = ff_mpeg1_default_non_intra_matrix[i];
2219         s->inter_matrix[j]        = v;
2220         s->chroma_inter_matrix[j] = v;
2221     }
2222
2223     s->progressive_sequence  = 1;
2224     s->progressive_frame     = 1;
2225     s->picture_structure     = PICT_FRAME;
2226     s->first_field           = 0;
2227     s->frame_pred_frame_dct  = 1;
2228     s->chroma_format         = 1;
2229     if (s->codec_tag == AV_RL32("BW10")) {
2230         s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2231     } else {
2232         s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
2233         s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
2234     }
2235     s1->save_width           = s->width;
2236     s1->save_height          = s->height;
2237     s1->save_progressive_seq = s->progressive_sequence;
2238     return 0;
2239 }
2240
2241 static int mpeg_decode_a53_cc(AVCodecContext *avctx,
2242                               const uint8_t *p, int buf_size)
2243 {
2244     Mpeg1Context *s1 = avctx->priv_data;
2245
2246     if (buf_size >= 6 &&
2247         p[0] == 'G' && p[1] == 'A' && p[2] == '9' && p[3] == '4' &&
2248         p[4] == 3 && (p[5] & 0x40)) {
2249         /* extract A53 Part 4 CC data */
2250         int cc_count = p[5] & 0x1f;
2251         if (cc_count > 0 && buf_size >= 7 + cc_count * 3) {
2252             av_freep(&s1->a53_caption);
2253             s1->a53_caption_size = cc_count * 3;
2254             s1->a53_caption      = av_malloc(s1->a53_caption_size);
2255             if (s1->a53_caption)
2256                 memcpy(s1->a53_caption, p + 7, s1->a53_caption_size);
2257         }
2258         return 1;
2259     } else if (buf_size >= 11 &&
2260                p[0] == 'C' && p[1] == 'C' && p[2] == 0x01 && p[3] == 0xf8) {
2261         /* extract DVD CC data */
2262         int cc_count = 0;
2263         int i;
2264         // There is a caption count field in the data, but it is often
2265         // incorect.  So count the number of captions present.
2266         for (i = 5; i + 6 <= buf_size && ((p[i] & 0xfe) == 0xfe); i += 6)
2267             cc_count++;
2268         // Transform the DVD format into A53 Part 4 format
2269         if (cc_count > 0) {
2270             av_freep(&s1->a53_caption);
2271             s1->a53_caption_size = cc_count * 6;
2272             s1->a53_caption      = av_malloc(s1->a53_caption_size);
2273             if (s1->a53_caption) {
2274                 uint8_t field1 = !!(p[4] & 0x80);
2275                 uint8_t *cap = s1->a53_caption;
2276                 p += 5;
2277                 for (i = 0; i < cc_count; i++) {
2278                     cap[0] = (p[0] == 0xff && field1) ? 0xfc : 0xfd;
2279                     cap[1] = p[1];
2280                     cap[2] = p[2];
2281                     cap[3] = (p[3] == 0xff && !field1) ? 0xfc : 0xfd;
2282                     cap[4] = p[4];
2283                     cap[5] = p[5];
2284                     cap += 6;
2285                     p += 6;
2286                 }
2287             }
2288         }
2289         return 1;
2290     }
2291     return 0;
2292 }
2293
2294 static void mpeg_decode_user_data(AVCodecContext *avctx,
2295                                   const uint8_t *p, int buf_size)
2296 {
2297     Mpeg1Context *s = avctx->priv_data;
2298     const uint8_t *buf_end = p + buf_size;
2299     Mpeg1Context *s1 = avctx->priv_data;
2300
2301 #if 0
2302     int i;
2303     for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i<buf_size; i++){
2304         av_log(avctx, AV_LOG_ERROR, "%c", p[i]);
2305     }
2306     av_log(avctx, AV_LOG_ERROR, "\n");
2307 #endif
2308
2309     if (buf_size > 29){
2310         int i;
2311         for(i=0; i<20; i++)
2312             if (!memcmp(p+i, "\0TMPGEXS\0", 9)){
2313                 s->tmpgexs= 1;
2314             }
2315     }
2316     /* we parse the DTG active format information */
2317     if (buf_end - p >= 5 &&
2318         p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2319         int flags = p[4];
2320         p += 5;
2321         if (flags & 0x80) {
2322             /* skip event id */
2323             p += 2;
2324         }
2325         if (flags & 0x40) {
2326             if (buf_end - p < 1)
2327                 return;
2328 #if FF_API_AFD
2329 FF_DISABLE_DEPRECATION_WARNINGS
2330             avctx->dtg_active_format = p[0] & 0x0f;
2331 FF_ENABLE_DEPRECATION_WARNINGS
2332 #endif /* FF_API_AFD */
2333             s1->has_afd = 1;
2334             s1->afd     = p[0] & 0x0f;
2335         }
2336     } else if (buf_end - p >= 6 &&
2337                p[0] == 'J' && p[1] == 'P' && p[2] == '3' && p[3] == 'D' &&
2338                p[4] == 0x03) { // S3D_video_format_length
2339         // the 0x7F mask ignores the reserved_bit value
2340         const uint8_t S3D_video_format_type = p[5] & 0x7F;
2341
2342         if (S3D_video_format_type == 0x03 ||
2343             S3D_video_format_type == 0x04 ||
2344             S3D_video_format_type == 0x08 ||
2345             S3D_video_format_type == 0x23) {
2346
2347             s1->has_stereo3d = 1;
2348
2349             switch (S3D_video_format_type) {
2350             case 0x03:
2351                 s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE;
2352                 break;
2353             case 0x04:
2354                 s1->stereo3d.type = AV_STEREO3D_TOPBOTTOM;
2355                 break;
2356             case 0x08:
2357                 s1->stereo3d.type = AV_STEREO3D_2D;
2358                 break;
2359             case 0x23:
2360                 s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE_QUINCUNX;
2361                 break;
2362             }
2363         }
2364     } else if (mpeg_decode_a53_cc(avctx, p, buf_size)) {
2365         return;
2366     }
2367 }
2368
2369 static void mpeg_decode_gop(AVCodecContext *avctx,
2370                             const uint8_t *buf, int buf_size)
2371 {
2372     Mpeg1Context *s1  = avctx->priv_data;
2373     MpegEncContext *s = &s1->mpeg_enc_ctx;
2374     int broken_link;
2375     int64_t tc;
2376
2377     init_get_bits(&s->gb, buf, buf_size * 8);
2378
2379     tc = s-> timecode_frame_start = get_bits(&s->gb, 25);
2380
2381 #if FF_API_PRIVATE_OPT
2382 FF_DISABLE_DEPRECATION_WARNINGS
2383     avctx->timecode_frame_start = tc;
2384 FF_ENABLE_DEPRECATION_WARNINGS
2385 #endif
2386
2387     s->closed_gop = get_bits1(&s->gb);
2388     /* broken_link indicate that after editing the
2389      * reference frames of the first B-Frames after GOP I-Frame
2390      * are missing (open gop) */
2391     broken_link = get_bits1(&s->gb);
2392
2393     if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2394         char tcbuf[AV_TIMECODE_STR_SIZE];
2395         av_timecode_make_mpeg_tc_string(tcbuf, tc);
2396         av_log(s->avctx, AV_LOG_DEBUG,
2397                "GOP (%s) closed_gop=%d broken_link=%d\n",
2398                tcbuf, s->closed_gop, broken_link);
2399     }
2400 }
2401
2402 static int decode_chunks(AVCodecContext *avctx, AVFrame *picture,
2403                          int *got_output, const uint8_t *buf, int buf_size)
2404 {
2405     Mpeg1Context *s = avctx->priv_data;
2406     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2407     const uint8_t *buf_ptr = buf;
2408     const uint8_t *buf_end = buf + buf_size;
2409     int ret, input_size;
2410     int last_code = 0, skip_frame = 0;
2411     int picture_start_code_seen = 0;
2412
2413     for (;;) {
2414         /* find next start code */
2415         uint32_t start_code = -1;
2416         buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
2417         if (start_code > 0x1ff) {
2418             if (!skip_frame) {
2419                 if (HAVE_THREADS &&
2420                     (avctx->active_thread_type & FF_THREAD_SLICE) &&
2421                     !avctx->hwaccel) {
2422                     int i;
2423                     av_assert0(avctx->thread_count > 1);
2424
2425                     avctx->execute(avctx, slice_decode_thread,
2426                                    &s2->thread_context[0], NULL,
2427                                    s->slice_count, sizeof(void *));
2428                     for (i = 0; i < s->slice_count; i++)
2429                         s2->er.error_count += s2->thread_context[i]->er.error_count;
2430                 }
2431
2432 #if FF_API_VDPAU
2433                 if ((CONFIG_MPEG_VDPAU_DECODER || CONFIG_MPEG1_VDPAU_DECODER)
2434                     && uses_vdpau(avctx))
2435                     ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2436 #endif
2437
2438                 ret = slice_end(avctx, picture);
2439                 if (ret < 0)
2440                     return ret;
2441                 else if (ret) {
2442                     // FIXME: merge with the stuff in mpeg_decode_slice
2443                     if (s2->last_picture_ptr || s2->low_delay)
2444                         *got_output = 1;
2445                 }
2446             }
2447             s2->pict_type = 0;
2448
2449             if (avctx->err_recognition & AV_EF_EXPLODE && s2->er.error_count)
2450                 return AVERROR_INVALIDDATA;
2451
2452             return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2453         }
2454
2455         input_size = buf_end - buf_ptr;
2456
2457         if (avctx->debug & FF_DEBUG_STARTCODE)
2458             av_log(avctx, AV_LOG_DEBUG, "%3"PRIX32" at %"PTRDIFF_SPECIFIER" left %d\n",
2459                    start_code, buf_ptr - buf, input_size);
2460
2461         /* prepare data for next start code */
2462         switch (start_code) {
2463         case SEQ_START_CODE:
2464             if (last_code == 0) {
2465                 mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2466                 if (buf != avctx->extradata)
2467                     s->sync = 1;
2468             } else {
2469                 av_log(avctx, AV_LOG_ERROR,
2470                        "ignoring SEQ_START_CODE after %X\n", last_code);
2471                 if (avctx->err_recognition & AV_EF_EXPLODE)
2472                     return AVERROR_INVALIDDATA;
2473             }
2474             break;
2475
2476         case PICTURE_START_CODE:
2477             if (picture_start_code_seen && s2->picture_structure == PICT_FRAME) {
2478                /* If it's a frame picture, there can't be more than one picture header.
2479                   Yet, it does happen and we need to handle it. */
2480                av_log(avctx, AV_LOG_WARNING, "ignoring extra picture following a frame-picture\n");
2481                break;
2482             }
2483             picture_start_code_seen = 1;
2484
2485             if (s2->width <= 0 || s2->height <= 0) {
2486                 av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
2487                        s2->width, s2->height);
2488                 return AVERROR_INVALIDDATA;
2489             }
2490
2491             if (s->tmpgexs){
2492                 s2->intra_dc_precision= 3;
2493                 s2->intra_matrix[0]= 1;
2494             }
2495             if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
2496                 !avctx->hwaccel && s->slice_count) {
2497                 int i;
2498
2499                 avctx->execute(avctx, slice_decode_thread,
2500                                s2->thread_context, NULL,
2501                                s->slice_count, sizeof(void *));
2502                 for (i = 0; i < s->slice_count; i++)
2503                     s2->er.error_count += s2->thread_context[i]->er.error_count;
2504                 s->slice_count = 0;
2505             }
2506             if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2507                 ret = mpeg_decode_postinit(avctx);
2508                 if (ret < 0) {
2509                     av_log(avctx, AV_LOG_ERROR,
2510                            "mpeg_decode_postinit() failure\n");
2511                     return ret;
2512                 }
2513
2514                 /* We have a complete image: we try to decompress it. */
2515                 if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2516                     s2->pict_type = 0;
2517                 s->first_slice = 1;
2518                 last_code      = PICTURE_START_CODE;
2519             } else {
2520                 av_log(avctx, AV_LOG_ERROR,
2521                        "ignoring pic after %X\n", last_code);
2522                 if (avctx->err_recognition & AV_EF_EXPLODE)
2523                     return AVERROR_INVALIDDATA;
2524             }
2525             break;
2526         case EXT_START_CODE:
2527             init_get_bits(&s2->gb, buf_ptr, input_size * 8);
2528
2529             switch (get_bits(&s2->gb, 4)) {
2530             case 0x1:
2531                 if (last_code == 0) {
2532                     mpeg_decode_sequence_extension(s);
2533                 } else {
2534                     av_log(avctx, AV_LOG_ERROR,
2535                            "ignoring seq ext after %X\n", last_code);
2536                     if (avctx->err_recognition & AV_EF_EXPLODE)
2537                         return AVERROR_INVALIDDATA;
2538                 }
2539                 break;
2540             case 0x2:
2541                 mpeg_decode_sequence_display_extension(s);
2542                 break;
2543             case 0x3:
2544                 mpeg_decode_quant_matrix_extension(s2);
2545                 break;
2546             case 0x7:
2547                 mpeg_decode_picture_display_extension(s);
2548                 break;
2549             case 0x8:
2550                 if (last_code == PICTURE_START_CODE) {
2551                     mpeg_decode_picture_coding_extension(s);
2552                 } else {
2553                     av_log(avctx, AV_LOG_ERROR,
2554                            "ignoring pic cod ext after %X\n", last_code);
2555                     if (avctx->err_recognition & AV_EF_EXPLODE)
2556                         return AVERROR_INVALIDDATA;
2557                 }
2558                 break;
2559             }
2560             break;
2561         case USER_START_CODE:
2562             mpeg_decode_user_data(avctx, buf_ptr, input_size);
2563             break;
2564         case GOP_START_CODE:
2565             if (last_code == 0) {
2566                 s2->first_field = 0;
2567                 mpeg_decode_gop(avctx, buf_ptr, input_size);
2568                 s->sync = 1;
2569             } else {
2570                 av_log(avctx, AV_LOG_ERROR,
2571                        "ignoring GOP_START_CODE after %X\n", last_code);
2572                 if (avctx->err_recognition & AV_EF_EXPLODE)
2573                     return AVERROR_INVALIDDATA;
2574             }
2575             break;
2576         default:
2577             if (start_code >= SLICE_MIN_START_CODE &&
2578                 start_code <= SLICE_MAX_START_CODE && last_code == PICTURE_START_CODE) {
2579                 if (s2->progressive_sequence && !s2->progressive_frame) {
2580                     s2->progressive_frame = 1;
2581                     av_log(s2->avctx, AV_LOG_ERROR,
2582                            "interlaced frame in progressive sequence, ignoring\n");
2583                 }
2584
2585                 if (s2->picture_structure == 0 ||
2586                     (s2->progressive_frame && s2->picture_structure != PICT_FRAME)) {
2587                     av_log(s2->avctx, AV_LOG_ERROR,
2588                            "picture_structure %d invalid, ignoring\n",
2589                            s2->picture_structure);
2590                     s2->picture_structure = PICT_FRAME;
2591                 }
2592
2593                 if (s2->progressive_sequence && !s2->frame_pred_frame_dct)
2594                     av_log(s2->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
2595
2596                 if (s2->picture_structure == PICT_FRAME) {
2597                     s2->first_field = 0;
2598                     s2->v_edge_pos  = 16 * s2->mb_height;
2599                 } else {
2600                     s2->first_field ^= 1;
2601                     s2->v_edge_pos   = 8 * s2->mb_height;
2602                     memset(s2->mbskip_table, 0, s2->mb_stride * s2->mb_height);
2603                 }
2604             }
2605             if (start_code >= SLICE_MIN_START_CODE &&
2606                 start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2607                 const int field_pic = s2->picture_structure != PICT_FRAME;
2608                 int mb_y = start_code - SLICE_MIN_START_CODE;
2609                 last_code = SLICE_MIN_START_CODE;
2610                 if (s2->codec_id != AV_CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
2611                     mb_y += (*buf_ptr&0xE0)<<2;
2612
2613                 mb_y <<= field_pic;
2614                 if (s2->picture_structure == PICT_BOTTOM_FIELD)
2615                     mb_y++;
2616
2617                 if (buf_end - buf_ptr < 2) {
2618                     av_log(s2->avctx, AV_LOG_ERROR, "slice too small\n");
2619                     return AVERROR_INVALIDDATA;
2620                 }
2621
2622                 if (mb_y >= s2->mb_height) {
2623                     av_log(s2->avctx, AV_LOG_ERROR,
2624                            "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2625                     return AVERROR_INVALIDDATA;
2626                 }
2627
2628                 if (!s2->last_picture_ptr) {
2629                     /* Skip B-frames if we do not have reference frames and
2630                      * GOP is not closed. */
2631                     if (s2->pict_type == AV_PICTURE_TYPE_B) {
2632                         if (!s2->closed_gop) {
2633                             skip_frame = 1;
2634                             break;
2635                         }
2636                     }
2637                 }
2638                 if (s2->pict_type == AV_PICTURE_TYPE_I || (s2->avctx->flags2 & AV_CODEC_FLAG2_SHOW_ALL))
2639                     s->sync = 1;
2640                 if (!s2->next_picture_ptr) {
2641                     /* Skip P-frames if we do not have a reference frame or
2642                      * we have an invalid header. */
2643                     if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
2644                         skip_frame = 1;
2645                         break;
2646                     }
2647                 }
2648                 if ((avctx->skip_frame >= AVDISCARD_NONREF &&
2649                      s2->pict_type == AV_PICTURE_TYPE_B) ||
2650                     (avctx->skip_frame >= AVDISCARD_NONKEY &&
2651                      s2->pict_type != AV_PICTURE_TYPE_I) ||
2652                     avctx->skip_frame >= AVDISCARD_ALL) {
2653                     skip_frame = 1;
2654                     break;
2655                 }
2656
2657                 if (!s->mpeg_enc_ctx_allocated)
2658                     break;
2659
2660                 if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2661                     if (mb_y < avctx->skip_top ||
2662                         mb_y >= s2->mb_height - avctx->skip_bottom)
2663                         break;
2664                 }
2665
2666                 if (!s2->pict_type) {
2667                     av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2668                     if (avctx->err_recognition & AV_EF_EXPLODE)
2669                         return AVERROR_INVALIDDATA;
2670                     break;
2671                 }
2672
2673                 if (s->first_slice) {
2674                     skip_frame     = 0;
2675                     s->first_slice = 0;
2676                     if ((ret = mpeg_field_start(s2, buf, buf_size)) < 0)
2677                         return ret;
2678                 }
2679                 if (!s2->current_picture_ptr) {
2680                     av_log(avctx, AV_LOG_ERROR,
2681                            "current_picture not initialized\n");
2682                     return AVERROR_INVALIDDATA;
2683                 }
2684
2685 #if FF_API_VDPAU
2686                 if (uses_vdpau(avctx)) {
2687                     s->slice_count++;
2688                     break;
2689                 }
2690 #endif
2691
2692                 if (HAVE_THREADS &&
2693                     (avctx->active_thread_type & FF_THREAD_SLICE) &&
2694                     !avctx->hwaccel) {
2695                     int threshold = (s2->mb_height * s->slice_count +
2696                                      s2->slice_context_count / 2) /
2697                                     s2->slice_context_count;
2698                     av_assert0(avctx->thread_count > 1);
2699                     if (threshold <= mb_y) {
2700                         MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2701
2702                         thread_context->start_mb_y = mb_y;
2703                         thread_context->end_mb_y   = s2->mb_height;
2704                         if (s->slice_count) {
2705                             s2->thread_context[s->slice_count - 1]->end_mb_y = mb_y;
2706                             ret = ff_update_duplicate_context(thread_context, s2);
2707                             if (ret < 0)
2708                                 return ret;
2709                         }
2710                         init_get_bits(&thread_context->gb, buf_ptr, input_size * 8);
2711                         s->slice_count++;
2712                     }
2713                     buf_ptr += 2; // FIXME add minimum number of bytes per slice
2714                 } else {
2715                     ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2716                     emms_c();
2717
2718                     if (ret < 0) {
2719                         if (avctx->err_recognition & AV_EF_EXPLODE)
2720                             return ret;
2721                         if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2722                             ff_er_add_slice(&s2->er, s2->resync_mb_x,
2723                                             s2->resync_mb_y, s2->mb_x, s2->mb_y,
2724                                             ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2725                     } else {
2726                         ff_er_add_slice(&s2->er, s2->resync_mb_x,
2727                                         s2->resync_mb_y, s2->mb_x - 1, s2->mb_y,
2728                                         ER_AC_END | ER_DC_END | ER_MV_END);
2729                     }
2730                 }
2731             }
2732             break;
2733         }
2734     }
2735 }
2736
2737 static int mpeg_decode_frame(AVCodecContext *avctx, void *data,
2738                              int *got_output, AVPacket *avpkt)
2739 {
2740     const uint8_t *buf = avpkt->data;
2741     int ret;
2742     int buf_size = avpkt->size;
2743     Mpeg1Context *s = avctx->priv_data;
2744     AVFrame *picture = data;
2745     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2746
2747     if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2748         /* special case for last picture */
2749         if (s2->low_delay == 0 && s2->next_picture_ptr) {
2750             int ret = av_frame_ref(picture, s2->next_picture_ptr->f);
2751             if (ret < 0)
2752                 return ret;
2753
2754             s2->next_picture_ptr = NULL;
2755
2756             *got_output = 1;
2757         }
2758         return buf_size;
2759     }
2760
2761     if (s2->avctx->flags & AV_CODEC_FLAG_TRUNCATED) {
2762         int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf,
2763                                            buf_size, NULL);
2764
2765         if (ff_combine_frame(&s2->parse_context, next,
2766                              (const uint8_t **) &buf, &buf_size) < 0)
2767             return buf_size;
2768     }
2769
2770     s2->codec_tag = avpriv_toupper4(avctx->codec_tag);
2771     if (s->mpeg_enc_ctx_allocated == 0 && (   s2->codec_tag == AV_RL32("VCR2")
2772                                            || s2->codec_tag == AV_RL32("BW10")
2773                                           ))
2774         vcr2_init_sequence(avctx);
2775
2776     s->slice_count = 0;
2777
2778     if (avctx->extradata && !s->extradata_decoded) {
2779         ret = decode_chunks(avctx, picture, got_output,
2780                             avctx->extradata, avctx->extradata_size);
2781         if (*got_output) {
2782             av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
2783             *got_output = 0;
2784         }
2785         s->extradata_decoded = 1;
2786         if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) {
2787             s2->current_picture_ptr = NULL;
2788             return ret;
2789         }
2790     }
2791
2792     ret = decode_chunks(avctx, picture, got_output, buf, buf_size);
2793     if (ret<0 || *got_output) {
2794         s2->current_picture_ptr = NULL;
2795
2796         if (s2->timecode_frame_start != -1 && *got_output) {
2797             AVFrameSideData *tcside = av_frame_new_side_data(picture,
2798                                                              AV_FRAME_DATA_GOP_TIMECODE,
2799                                                              sizeof(int64_t));
2800             if (!tcside)
2801                 return AVERROR(ENOMEM);
2802             memcpy(tcside->data, &s2->timecode_frame_start, sizeof(int64_t));
2803
2804             s2->timecode_frame_start = -1;
2805         }
2806     }
2807
2808     return ret;
2809 }
2810
2811 static void flush(AVCodecContext *avctx)
2812 {
2813     Mpeg1Context *s = avctx->priv_data;
2814
2815     s->sync       = 0;
2816
2817     ff_mpeg_flush(avctx);
2818 }
2819
2820 static av_cold int mpeg_decode_end(AVCodecContext *avctx)
2821 {
2822     Mpeg1Context *s = avctx->priv_data;
2823
2824     if (s->mpeg_enc_ctx_allocated)
2825         ff_mpv_common_end(&s->mpeg_enc_ctx);
2826     av_freep(&s->a53_caption);
2827     return 0;
2828 }
2829
2830 AVCodec ff_mpeg1video_decoder = {
2831     .name                  = "mpeg1video",
2832     .long_name             = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2833     .type                  = AVMEDIA_TYPE_VIDEO,
2834     .id                    = AV_CODEC_ID_MPEG1VIDEO,
2835     .priv_data_size        = sizeof(Mpeg1Context),
2836     .init                  = mpeg_decode_init,
2837     .close                 = mpeg_decode_end,
2838     .decode                = mpeg_decode_frame,
2839     .capabilities          = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2840                              AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2841                              AV_CODEC_CAP_SLICE_THREADS,
2842     .flush                 = flush,
2843     .max_lowres            = 3,
2844     .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context)
2845 };
2846
2847 AVCodec ff_mpeg2video_decoder = {
2848     .name           = "mpeg2video",
2849     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2850     .type           = AVMEDIA_TYPE_VIDEO,
2851     .id             = AV_CODEC_ID_MPEG2VIDEO,
2852     .priv_data_size = sizeof(Mpeg1Context),
2853     .init           = mpeg_decode_init,
2854     .close          = mpeg_decode_end,
2855     .decode         = mpeg_decode_frame,
2856     .capabilities   = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2857                       AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2858                       AV_CODEC_CAP_SLICE_THREADS,
2859     .flush          = flush,
2860     .max_lowres     = 3,
2861     .profiles       = NULL_IF_CONFIG_SMALL(ff_mpeg2_video_profiles),
2862 };
2863
2864 //legacy decoder
2865 AVCodec ff_mpegvideo_decoder = {
2866     .name           = "mpegvideo",
2867     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2868     .type           = AVMEDIA_TYPE_VIDEO,
2869     .id             = AV_CODEC_ID_MPEG2VIDEO,
2870     .priv_data_size = sizeof(Mpeg1Context),
2871     .init           = mpeg_decode_init,
2872     .close          = mpeg_decode_end,
2873     .decode         = mpeg_decode_frame,
2874     .capabilities   = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 | AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SLICE_THREADS,
2875     .flush          = flush,
2876     .max_lowres     = 3,
2877 };
2878
2879 #if FF_API_XVMC
2880 #if CONFIG_MPEG_XVMC_DECODER
2881 FF_DISABLE_DEPRECATION_WARNINGS
2882 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx)
2883 {
2884     if (avctx->active_thread_type & FF_THREAD_SLICE)
2885         return -1;
2886     if (!(avctx->slice_flags & SLICE_FLAG_CODED_ORDER))
2887         return -1;
2888     if (!(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
2889         ff_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2890     }
2891     mpeg_decode_init(avctx);
2892
2893     avctx->pix_fmt           = AV_PIX_FMT_XVMC_MPEG2_IDCT;
2894     avctx->xvmc_acceleration = 2; // 2 - the blocks are packed!
2895
2896     return 0;
2897 }
2898
2899 AVCodec ff_mpeg_xvmc_decoder = {
2900     .name           = "mpegvideo_xvmc",
2901     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2902     .type           = AVMEDIA_TYPE_VIDEO,
2903     .id             = AV_CODEC_ID_MPEG2VIDEO_XVMC,
2904     .priv_data_size = sizeof(Mpeg1Context),
2905     .init           = mpeg_mc_decode_init,
2906     .close          = mpeg_decode_end,
2907     .decode         = mpeg_decode_frame,
2908     .capabilities   = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2909                       AV_CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL |
2910                       AV_CODEC_CAP_DELAY,
2911     .flush          = flush,
2912 };
2913 FF_ENABLE_DEPRECATION_WARNINGS
2914 #endif
2915 #endif /* FF_API_XVMC */
2916
2917 #if CONFIG_MPEG_VDPAU_DECODER && FF_API_VDPAU
2918 AVCodec ff_mpeg_vdpau_decoder = {
2919     .name           = "mpegvideo_vdpau",
2920     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2921     .type           = AVMEDIA_TYPE_VIDEO,
2922     .id             = AV_CODEC_ID_MPEG2VIDEO,
2923     .priv_data_size = sizeof(Mpeg1Context),
2924     .init           = mpeg_decode_init,
2925     .close          = mpeg_decode_end,
2926     .decode         = mpeg_decode_frame,
2927     .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_TRUNCATED |
2928                       AV_CODEC_CAP_HWACCEL_VDPAU | AV_CODEC_CAP_DELAY,
2929     .flush          = flush,
2930 };
2931 #endif
2932
2933 #if CONFIG_MPEG1_VDPAU_DECODER && FF_API_VDPAU
2934 AVCodec ff_mpeg1_vdpau_decoder = {
2935     .name           = "mpeg1video_vdpau",
2936     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
2937     .type           = AVMEDIA_TYPE_VIDEO,
2938     .id             = AV_CODEC_ID_MPEG1VIDEO,
2939     .priv_data_size = sizeof(Mpeg1Context),
2940     .init           = mpeg_decode_init,
2941     .close          = mpeg_decode_end,
2942     .decode         = mpeg_decode_frame,
2943     .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_TRUNCATED |
2944                       AV_CODEC_CAP_HWACCEL_VDPAU | AV_CODEC_CAP_DELAY,
2945     .flush          = flush,
2946 };
2947 #endif