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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/internal.h"
  33 #include "libavutil/stereo3d.h"
  34
  35 #include "avcodec.h"
  36 #include "bytestream.h"
  37 #include "error_resilience.h"
  38 #include "idctdsp.h"
  39 #include "internal.h"
  40 #include "mpeg_er.h"
  41 #include "mpeg12.h"
  42 #include "mpeg12data.h"
  43 #include "mpegutils.h"
  44 #include "mpegvideo.h"
  45 #include "thread.h"
  46 #include "version.h"
  47 #include "vdpau_internal.h"
  48 #include "xvmc_internal.h"
  49
  50 typedef struct Mpeg1Context {
  51     MpegEncContext mpeg_enc_ctx;
  52     int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
  53     int repeat_field;           /* true if we must repeat the field */
  54     AVPanScan pan_scan;         /* some temporary storage for the panscan */
  55     AVStereo3D stereo3d;
  56     int has_stereo3d;
  57     uint8_t *a53_caption;
  58     int a53_caption_size;
  59     uint8_t afd;
  60     int has_afd;
  61     int slice_count;
  62     int save_aspect_info;
  63     int save_width, save_height, save_progressive_seq;
  64     AVRational frame_rate_ext;  /* MPEG-2 specific framerate modificator */
  65     int sync;                   /* Did we reach a sync point like a GOP/SEQ/KEYFrame? */
  66     int tmpgexs;
  67     int first_slice;
  68     int extradata_decoded;
  69 } Mpeg1Context;
  70
  71 #define MB_TYPE_ZERO_MV   0x20000000
  72
  73 static const uint32_t ptype2mb_type[7] = {
  74                     MB_TYPE_INTRA,
  75                     MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
  76                     MB_TYPE_L0,
  77                     MB_TYPE_L0 | MB_TYPE_CBP,
  78     MB_TYPE_QUANT | MB_TYPE_INTRA,
  79     MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
  80     MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
  81 };
  82
  83 static const uint32_t btype2mb_type[11] = {
  84                     MB_TYPE_INTRA,
  85                     MB_TYPE_L1,
  86                     MB_TYPE_L1   | MB_TYPE_CBP,
  87                     MB_TYPE_L0,
  88                     MB_TYPE_L0   | MB_TYPE_CBP,
  89                     MB_TYPE_L0L1,
  90                     MB_TYPE_L0L1 | MB_TYPE_CBP,
  91     MB_TYPE_QUANT | MB_TYPE_INTRA,
  92     MB_TYPE_QUANT | MB_TYPE_L1   | MB_TYPE_CBP,
  93     MB_TYPE_QUANT | MB_TYPE_L0   | MB_TYPE_CBP,
  94     MB_TYPE_QUANT | MB_TYPE_L0L1 | MB_TYPE_CBP,
  95 };
  96
  97 static const uint8_t non_linear_qscale[32] = {
  98      0,  1,  2,  3,  4,  5,   6,   7,
  99      8, 10, 12, 14, 16, 18,  20,  22,
 100     24, 28, 32, 36, 40, 44,  48,  52,
 101     56, 64, 72, 80, 88, 96, 104, 112,
 102 };
 103
 104 /* as H.263, but only 17 codes */
 105 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
 106 {
 107     int code, sign, val, shift;
 108
 109     code = get_vlc2(&s->gb, ff_mv_vlc.table, MV_VLC_BITS, 2);
 110     if (code == 0)
 111         return pred;
 112     if (code < 0)
 113         return 0xffff;
 114
 115     sign  = get_bits1(&s->gb);
 116     shift = fcode - 1;
 117     val   = code;
 118     if (shift) {
 119         val  = (val - 1) << shift;
 120         val |= get_bits(&s->gb, shift);
 121         val++;
 122     }
 123     if (sign)
 124         val = -val;
 125     val += pred;
 126
 127     /* modulo decoding */
 128     return sign_extend(val, 5 + shift);
 129 }
 130
 131 #define check_scantable_index(ctx, x)                                         \
 132     do {                                                                      \
 133         if ((x) > 63) {                                                       \
 134             av_log(ctx->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n",     \
 135                    ctx->mb_x, ctx->mb_y);                                     \
 136             return AVERROR_INVALIDDATA;                                       \
 137         }                                                                     \
 138     } while (0)
 139
 140 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
 141                                            int16_t *block, int n)
 142 {
 143     int level, dc, diff, i, j, run;
 144     int component;
 145     RLTable *rl                  = &ff_rl_mpeg1;
 146     uint8_t *const scantable     = s->intra_scantable.permutated;
 147     const uint16_t *quant_matrix = s->intra_matrix;
 148     const int qscale             = s->qscale;
 149
 150     /* DC coefficient */
 151     component = (n <= 3 ? 0 : n - 4 + 1);
 152     diff = decode_dc(&s->gb, component);
 153     if (diff >= 0xffff)
 154         return -1;
 155     dc  = s->last_dc[component];
 156     dc += diff;
 157     s->last_dc[component] = dc;
 158     block[0] = dc * quant_matrix[0];
 159     av_dlog(s->avctx, "dc=%d diff=%d\n", dc, diff);
 160     i = 0;
 161     {
 162         OPEN_READER(re, &s->gb);
 163         UPDATE_CACHE(re, &s->gb);
 164         if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
 165             goto end;
 166
 167         /* now quantify & encode AC coefficients */
 168         for (;;) {
 169             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
 170                        TEX_VLC_BITS, 2, 0);
 171
 172             if (level != 0) {
 173                 i += run;
 174                 check_scantable_index(s, i);
 175                 j = scantable[i];
 176                 level = (level * qscale * quant_matrix[j]) >> 4;
 177                 level = (level - 1) | 1;
 178                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
 179                         SHOW_SBITS(re, &s->gb, 1);
 180                 SKIP_BITS(re, &s->gb, 1);
 181             } else {
 182                 /* escape */
 183                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
 184                 LAST_SKIP_BITS(re, &s->gb, 6);
 185                 UPDATE_CACHE(re, &s->gb);
 186                 level = SHOW_SBITS(re, &s->gb, 8);
 187                 SKIP_BITS(re, &s->gb, 8);
 188                 if (level == -128) {
 189                     level = SHOW_UBITS(re, &s->gb, 8) - 256;
 190                     SKIP_BITS(re, &s->gb, 8);
 191                 } else if (level == 0) {
 192                     level = SHOW_UBITS(re, &s->gb, 8);
 193                     SKIP_BITS(re, &s->gb, 8);
 194                 }
 195                 i += run;
 196                 check_scantable_index(s, i);
 197                 j = scantable[i];
 198                 if (level < 0) {
 199                     level = -level;
 200                     level = (level * qscale * quant_matrix[j]) >> 4;
 201                     level = (level - 1) | 1;
 202                     level = -level;
 203                 } else {
 204                     level = (level * qscale * quant_matrix[j]) >> 4;
 205                     level = (level - 1) | 1;
 206                 }
 207             }
 208
 209             block[j] = level;
 210             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
 211                break;
 212
 213             UPDATE_CACHE(re, &s->gb);
 214         }
 215 end:
 216         LAST_SKIP_BITS(re, &s->gb, 2);
 217         CLOSE_READER(re, &s->gb);
 218     }
 219     s->block_last_index[n] = i;
 220     return 0;
 221 }
 222
 223 int ff_mpeg1_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
 224 {
 225     return mpeg1_decode_block_intra(s, block, n);
 226 }
 227
 228 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
 229                                            int16_t *block, int n)
 230 {
 231     int level, i, j, run;
 232     RLTable *rl                  = &ff_rl_mpeg1;
 233     uint8_t *const scantable     = s->intra_scantable.permutated;
 234     const uint16_t *quant_matrix = s->inter_matrix;
 235     const int qscale             = s->qscale;
 236
 237     {
 238         OPEN_READER(re, &s->gb);
 239         i = -1;
 240         // special case for first coefficient, no need to add second VLC table
 241         UPDATE_CACHE(re, &s->gb);
 242         if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
 243             level = (3 * qscale * quant_matrix[0]) >> 5;
 244             level = (level - 1) | 1;
 245             if (GET_CACHE(re, &s->gb) & 0x40000000)
 246                 level = -level;
 247             block[0] = level;
 248             i++;
 249             SKIP_BITS(re, &s->gb, 2);
 250             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
 251                 goto end;
 252         }
 253         /* now quantify & encode AC coefficients */
 254         for (;;) {
 255             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
 256                        TEX_VLC_BITS, 2, 0);
 257
 258             if (level != 0) {
 259                 i += run;
 260                 check_scantable_index(s, i);
 261                 j = scantable[i];
 262                 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 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                 check_scantable_index(s, i);
 283                 j = scantable[i];
 284                 if (level < 0) {
 285                     level = -level;
 286                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 287                     level = (level - 1) | 1;
 288                     level = -level;
 289                 } else {
 290                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 291                     level = (level - 1) | 1;
 292                 }
 293             }
 294
 295             block[j] = level;
 296             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
 297                 break;
 298             UPDATE_CACHE(re, &s->gb);
 299         }
 300 end:
 301         LAST_SKIP_BITS(re, &s->gb, 2);
 302         CLOSE_READER(re, &s->gb);
 303     }
 304     s->block_last_index[n] = i;
 305     return 0;
 306 }
 307
 308 /**
 309  * Note: this function can read out of range and crash for corrupt streams.
 310  * Changing this would eat up any speed benefits it has.
 311  * Do not use "fast" flag if you need the code to be robust.
 312  */
 313 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s,
 314                                                 int16_t *block, int n)
 315 {
 316     int level, i, j, run;
 317     RLTable *rl              = &ff_rl_mpeg1;
 318     uint8_t *const scantable = s->intra_scantable.permutated;
 319     const int qscale         = s->qscale;
 320
 321     {
 322         OPEN_READER(re, &s->gb);
 323         i = -1;
 324         // Special case for first coefficient, no need to add second VLC table.
 325         UPDATE_CACHE(re, &s->gb);
 326         if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
 327             level = (3 * qscale) >> 1;
 328             level = (level - 1) | 1;
 329             if (GET_CACHE(re, &s->gb) & 0x40000000)
 330                 level = -level;
 331             block[0] = level;
 332             i++;
 333             SKIP_BITS(re, &s->gb, 2);
 334             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
 335                 goto end;
 336         }
 337
 338         /* now quantify & encode AC coefficients */
 339         for (;;) {
 340             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
 341                        TEX_VLC_BITS, 2, 0);
 342
 343             if (level != 0) {
 344                 i += run;
 345                 check_scantable_index(s, i);
 346                 j = scantable[i];
 347                 level = ((level * 2 + 1) * qscale) >> 1;
 348                 level = (level - 1) | 1;
 349                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
 350                         SHOW_SBITS(re, &s->gb, 1);
 351                 SKIP_BITS(re, &s->gb, 1);
 352             } else {
 353                 /* escape */
 354                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
 355                 LAST_SKIP_BITS(re, &s->gb, 6);
 356                 UPDATE_CACHE(re, &s->gb);
 357                 level = SHOW_SBITS(re, &s->gb, 8);
 358                 SKIP_BITS(re, &s->gb, 8);
 359                 if (level == -128) {
 360                     level = SHOW_UBITS(re, &s->gb, 8) - 256;
 361                     SKIP_BITS(re, &s->gb, 8);
 362                 } else if (level == 0) {
 363                     level = SHOW_UBITS(re, &s->gb, 8);
 364                     SKIP_BITS(re, &s->gb, 8);
 365                 }
 366                 i += run;
 367                 check_scantable_index(s, i);
 368                 j = scantable[i];
 369                 if (level < 0) {
 370                     level = -level;
 371                     level = ((level * 2 + 1) * qscale) >> 1;
 372                     level = (level - 1) | 1;
 373                     level = -level;
 374                 } else {
 375                     level = ((level * 2 + 1) * qscale) >> 1;
 376                     level = (level - 1) | 1;
 377                 }
 378             }
 379
 380             block[j] = level;
 381             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
 382                 break;
 383             UPDATE_CACHE(re, &s->gb);
 384         }
 385 end:
 386         LAST_SKIP_BITS(re, &s->gb, 2);
 387         CLOSE_READER(re, &s->gb);
 388     }
 389     s->block_last_index[n] = i;
 390     return 0;
 391 }
 392
 393 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
 394                                                int16_t *block, int n)
 395 {
 396     int level, i, j, run;
 397     RLTable *rl = &ff_rl_mpeg1;
 398     uint8_t *const scantable = s->intra_scantable.permutated;
 399     const uint16_t *quant_matrix;
 400     const int qscale = s->qscale;
 401     int mismatch;
 402
 403     mismatch = 1;
 404
 405     {
 406         OPEN_READER(re, &s->gb);
 407         i = -1;
 408         if (n < 4)
 409             quant_matrix = s->inter_matrix;
 410         else
 411             quant_matrix = s->chroma_inter_matrix;
 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 * quant_matrix[0]) >> 5;
 417             if (GET_CACHE(re, &s->gb) & 0x40000000)
 418                 level = -level;
 419             block[0]  = level;
 420             mismatch ^= level;
 421             i++;
 422             SKIP_BITS(re, &s->gb, 2);
 423             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
 424                 goto end;
 425         }
 426
 427         /* now quantify & encode AC coefficients */
 428         for (;;) {
 429             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
 430                        TEX_VLC_BITS, 2, 0);
 431
 432             if (level != 0) {
 433                 i += run;
 434                 check_scantable_index(s, i);
 435                 j = scantable[i];
 436                 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 437                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
 438                         SHOW_SBITS(re, &s->gb, 1);
 439                 SKIP_BITS(re, &s->gb, 1);
 440             } else {
 441                 /* escape */
 442                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
 443                 LAST_SKIP_BITS(re, &s->gb, 6);
 444                 UPDATE_CACHE(re, &s->gb);
 445                 level = SHOW_SBITS(re, &s->gb, 12);
 446                 SKIP_BITS(re, &s->gb, 12);
 447
 448                 i += run;
 449                 check_scantable_index(s, i);
 450                 j = scantable[i];
 451                 if (level < 0) {
 452                     level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 453                     level = -level;
 454                 } else {
 455                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 456                 }
 457             }
 458
 459             mismatch ^= level;
 460             block[j]  = level;
 461             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
 462                 break;
 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     block[63] ^= (mismatch & 1);
 470
 471     s->block_last_index[n] = i;
 472     return 0;
 473 }
 474
 475 /**
 476  * Note: this function can read out of range and crash for corrupt streams.
 477  * Changing this would eat up any speed benefits it has.
 478  * Do not use "fast" flag if you need the code to be robust.
 479  */
 480 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
 481                                                     int16_t *block, int n)
 482 {
 483     int level, i, j, run;
 484     RLTable *rl              = &ff_rl_mpeg1;
 485     uint8_t *const scantable = s->intra_scantable.permutated;
 486     const int qscale         = s->qscale;
 487     OPEN_READER(re, &s->gb);
 488     i = -1;
 489
 490     // special case for first coefficient, no need to add second VLC table
 491     UPDATE_CACHE(re, &s->gb);
 492     if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
 493         level = (3 * qscale) >> 1;
 494         if (GET_CACHE(re, &s->gb) & 0x40000000)
 495             level = -level;
 496         block[0] = level;
 497         i++;
 498         SKIP_BITS(re, &s->gb, 2);
 499         if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
 500             goto end;
 501     }
 502
 503     /* now quantify & encode AC coefficients */
 504     for (;;) {
 505         GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
 506
 507         if (level != 0) {
 508             i += run;
 509             j = scantable[i];
 510             level = ((level * 2 + 1) * qscale) >> 1;
 511             level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
 512                     SHOW_SBITS(re, &s->gb, 1);
 513             SKIP_BITS(re, &s->gb, 1);
 514         } else {
 515             /* escape */
 516             run = SHOW_UBITS(re, &s->gb, 6) + 1;
 517             LAST_SKIP_BITS(re, &s->gb, 6);
 518             UPDATE_CACHE(re, &s->gb);
 519             level = SHOW_SBITS(re, &s->gb, 12);
 520             SKIP_BITS(re, &s->gb, 12);
 521
 522             i += run;
 523             j = scantable[i];
 524             if (level < 0) {
 525                 level = ((-level * 2 + 1) * qscale) >> 1;
 526                 level = -level;
 527             } else {
 528                 level = ((level * 2 + 1) * qscale) >> 1;
 529             }
 530         }
 531
 532         block[j] = level;
 533         if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF || i > 63)
 534             break;
 535
 536         UPDATE_CACHE(re, &s->gb);
 537     }
 538 end:
 539     LAST_SKIP_BITS(re, &s->gb, 2);
 540     CLOSE_READER(re, &s->gb);
 541     s->block_last_index[n] = i;
 542     return 0;
 543 }
 544
 545 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
 546                                            int16_t *block, int n)
 547 {
 548     int level, dc, diff, i, j, run;
 549     int component;
 550     RLTable *rl;
 551     uint8_t *const scantable = s->intra_scantable.permutated;
 552     const uint16_t *quant_matrix;
 553     const int qscale = s->qscale;
 554     int mismatch;
 555
 556     /* DC coefficient */
 557     if (n < 4) {
 558         quant_matrix = s->intra_matrix;
 559         component    = 0;
 560     } else {
 561         quant_matrix = s->chroma_intra_matrix;
 562         component    = (n & 1) + 1;
 563     }
 564     diff = decode_dc(&s->gb, component);
 565     if (diff >= 0xffff)
 566         return -1;
 567     dc  = s->last_dc[component];
 568     dc += diff;
 569     s->last_dc[component] = dc;
 570     block[0] = dc << (3 - s->intra_dc_precision);
 571     av_dlog(s->avctx, "dc=%d\n", block[0]);
 572     mismatch = block[0] ^ 1;
 573     i = 0;
 574     if (s->intra_vlc_format)
 575         rl = &ff_rl_mpeg2;
 576     else
 577         rl = &ff_rl_mpeg1;
 578
 579     {
 580         OPEN_READER(re, &s->gb);
 581         /* now quantify & encode AC coefficients */
 582         for (;;) {
 583             UPDATE_CACHE(re, &s->gb);
 584             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
 585                        TEX_VLC_BITS, 2, 0);
 586
 587             if (level == 127) {
 588                 break;
 589             } else if (level != 0) {
 590                 i += run;
 591                 check_scantable_index(s, i);
 592                 j = scantable[i];
 593                 level = (level * qscale * quant_matrix[j]) >> 4;
 594                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
 595                         SHOW_SBITS(re, &s->gb, 1);
 596                 LAST_SKIP_BITS(re, &s->gb, 1);
 597             } else {
 598                 /* escape */
 599                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
 600                 LAST_SKIP_BITS(re, &s->gb, 6);
 601                 UPDATE_CACHE(re, &s->gb);
 602                 level = SHOW_SBITS(re, &s->gb, 12);
 603                 SKIP_BITS(re, &s->gb, 12);
 604                 i += run;
 605                 check_scantable_index(s, i);
 606                 j = scantable[i];
 607                 if (level < 0) {
 608                     level = (-level * qscale * quant_matrix[j]) >> 4;
 609                     level = -level;
 610                 } else {
 611                     level = (level * qscale * quant_matrix[j]) >> 4;
 612                 }
 613             }
 614
 615             mismatch ^= level;
 616             block[j]  = level;
 617         }
 618         CLOSE_READER(re, &s->gb);
 619     }
 620     block[63] ^= mismatch & 1;
 621
 622     s->block_last_index[n] = i;
 623     return 0;
 624 }
 625
 626 /**
 627  * Note: this function can read out of range and crash for corrupt streams.
 628  * Changing this would eat up any speed benefits it has.
 629  * Do not use "fast" flag if you need the code to be robust.
 630  */
 631 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
 632                                                 int16_t *block, int n)
 633 {
 634     int level, dc, diff, i, j, run;
 635     int component;
 636     RLTable *rl;
 637     uint8_t *const scantable = s->intra_scantable.permutated;
 638     const uint16_t *quant_matrix;
 639     const int qscale = s->qscale;
 640
 641     /* DC coefficient */
 642     if (n < 4) {
 643         quant_matrix = s->intra_matrix;
 644         component    = 0;
 645     } else {
 646         quant_matrix = s->chroma_intra_matrix;
 647         component    = (n & 1) + 1;
 648     }
 649     diff = decode_dc(&s->gb, component);
 650     if (diff >= 0xffff)
 651         return -1;
 652     dc = s->last_dc[component];
 653     dc += diff;
 654     s->last_dc[component] = dc;
 655     block[0] = dc << (3 - s->intra_dc_precision);
 656     i = 0;
 657     if (s->intra_vlc_format)
 658         rl = &ff_rl_mpeg2;
 659     else
 660         rl = &ff_rl_mpeg1;
 661
 662     {
 663         OPEN_READER(re, &s->gb);
 664         /* now quantify & encode AC coefficients */
 665         for (;;) {
 666             UPDATE_CACHE(re, &s->gb);
 667             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
 668                        TEX_VLC_BITS, 2, 0);
 669
 670             if (level >= 64 || i > 63) {
 671                 break;
 672             } else if (level != 0) {
 673                 i += run;
 674                 j = scantable[i];
 675                 level = (level * qscale * quant_matrix[j]) >> 4;
 676                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
 677                         SHOW_SBITS(re, &s->gb, 1);
 678                 LAST_SKIP_BITS(re, &s->gb, 1);
 679             } else {
 680                 /* escape */
 681                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
 682                 LAST_SKIP_BITS(re, &s->gb, 6);
 683                 UPDATE_CACHE(re, &s->gb);
 684                 level = SHOW_SBITS(re, &s->gb, 12);
 685                 SKIP_BITS(re, &s->gb, 12);
 686                 i += run;
 687                 j = scantable[i];
 688                 if (level < 0) {
 689                     level = (-level * qscale * quant_matrix[j]) >> 4;
 690                     level = -level;
 691                 } else {
 692                     level = (level * qscale * quant_matrix[j]) >> 4;
 693                 }
 694             }
 695
 696             block[j] = level;
 697         }
 698         CLOSE_READER(re, &s->gb);
 699     }
 700
 701     s->block_last_index[n] = i;
 702     return 0;
 703 }
 704
 705 /******************************************/
 706 /* decoding */
 707
 708 static inline int get_dmv(MpegEncContext *s)
 709 {
 710     if (get_bits1(&s->gb))
 711         return 1 - (get_bits1(&s->gb) << 1);
 712     else
 713         return 0;
 714 }
 715
 716 static inline int get_qscale(MpegEncContext *s)
 717 {
 718     int qscale = get_bits(&s->gb, 5);
 719     if (s->q_scale_type)
 720         return non_linear_qscale[qscale];
 721     else
 722         return qscale << 1;
 723 }
 724
 725
 726 /* motion type (for MPEG-2) */
 727 #define MT_FIELD 1
 728 #define MT_FRAME 2
 729 #define MT_16X8  2
 730 #define MT_DMV   3
 731
 732 static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
 733 {
 734     int i, j, k, cbp, val, mb_type, motion_type;
 735     const int mb_block_count = 4 + (1 << s->chroma_format);
 736
 737     av_dlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
 738
 739     av_assert2(s->mb_skipped == 0);
 740
 741     if (s->mb_skip_run-- != 0) {
 742         if (s->pict_type == AV_PICTURE_TYPE_P) {
 743             s->mb_skipped = 1;
 744             s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
 745                 MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
 746         } else {
 747             int mb_type;
 748
 749             if (s->mb_x)
 750                 mb_type = s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
 751             else
 752                 // FIXME not sure if this is allowed in MPEG at all
 753                 mb_type = s->current_picture.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1];
 754             if (IS_INTRA(mb_type)) {
 755                 av_log(s->avctx, AV_LOG_ERROR, "skip with previntra\n");
 756                 return -1;
 757             }
 758             s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
 759                 mb_type | MB_TYPE_SKIP;
 760
 761             if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
 762                 s->mb_skipped = 1;
 763         }
 764
 765         return 0;
 766     }
 767
 768     switch (s->pict_type) {
 769     default:
 770     case AV_PICTURE_TYPE_I:
 771         if (get_bits1(&s->gb) == 0) {
 772             if (get_bits1(&s->gb) == 0) {
 773                 av_log(s->avctx, AV_LOG_ERROR,
 774                        "invalid mb type in I Frame at %d %d\n",
 775                        s->mb_x, s->mb_y);
 776                 return -1;
 777             }
 778             mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
 779         } else {
 780             mb_type = MB_TYPE_INTRA;
 781         }
 782         break;
 783     case AV_PICTURE_TYPE_P:
 784         mb_type = get_vlc2(&s->gb, ff_mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
 785         if (mb_type < 0) {
 786             av_log(s->avctx, AV_LOG_ERROR,
 787                    "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
 788             return -1;
 789         }
 790         mb_type = ptype2mb_type[mb_type];
 791         break;
 792     case AV_PICTURE_TYPE_B:
 793         mb_type = get_vlc2(&s->gb, ff_mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
 794         if (mb_type < 0) {
 795             av_log(s->avctx, AV_LOG_ERROR,
 796                    "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
 797             return -1;
 798         }
 799         mb_type = btype2mb_type[mb_type];
 800         break;
 801     }
 802     av_dlog(s->avctx, "mb_type=%x\n", mb_type);
 803 //    motion_type = 0; /* avoid warning */
 804     if (IS_INTRA(mb_type)) {
 805         s->bdsp.clear_blocks(s->block[0]);
 806
 807         if (!s->chroma_y_shift)
 808             s->bdsp.clear_blocks(s->block[6]);
 809
 810         /* compute DCT type */
 811         // FIXME: add an interlaced_dct coded var?
 812         if (s->picture_structure == PICT_FRAME &&
 813             !s->frame_pred_frame_dct)
 814             s->interlaced_dct = get_bits1(&s->gb);
 815
 816         if (IS_QUANT(mb_type))
 817             s->qscale = get_qscale(s);
 818
 819         if (s->concealment_motion_vectors) {
 820             /* just parse them */
 821             if (s->picture_structure != PICT_FRAME)
 822                 skip_bits1(&s->gb);  /* field select */
 823
 824             s->mv[0][0][0]      =
 825             s->last_mv[0][0][0] =
 826             s->last_mv[0][1][0] = mpeg_decode_motion(s, s->mpeg_f_code[0][0],
 827                                                      s->last_mv[0][0][0]);
 828             s->mv[0][0][1]      =
 829             s->last_mv[0][0][1] =
 830             s->last_mv[0][1][1] = mpeg_decode_motion(s, s->mpeg_f_code[0][1],
 831                                                      s->last_mv[0][0][1]);
 832
 833             skip_bits1(&s->gb); /* marker */
 834         } else {
 835             /* reset mv prediction */
 836             memset(s->last_mv, 0, sizeof(s->last_mv));
 837         }
 838         s->mb_intra = 1;
 839         // if 1, we memcpy blocks in xvmcvideo
 840         if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
 841             ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
 842
 843         if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
 844             if (s->flags2 & CODEC_FLAG2_FAST) {
 845                 for (i = 0; i < 6; i++)
 846                     mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
 847             } else {
 848                 for (i = 0; i < mb_block_count; i++)
 849                     if (mpeg2_decode_block_intra(s, *s->pblocks[i], i) < 0)
 850                         return -1;
 851             }
 852         } else {
 853             for (i = 0; i < 6; i++)
 854                 if (mpeg1_decode_block_intra(s, *s->pblocks[i], i) < 0)
 855                     return -1;
 856         }
 857     } else {
 858         if (mb_type & MB_TYPE_ZERO_MV) {
 859             av_assert2(mb_type & MB_TYPE_CBP);
 860
 861             s->mv_dir = MV_DIR_FORWARD;
 862             if (s->picture_structure == PICT_FRAME) {
 863                 if (s->picture_structure == PICT_FRAME
 864                     && !s->frame_pred_frame_dct)
 865                     s->interlaced_dct = get_bits1(&s->gb);
 866                 s->mv_type = MV_TYPE_16X16;
 867             } else {
 868                 s->mv_type            = MV_TYPE_FIELD;
 869                 mb_type              |= MB_TYPE_INTERLACED;
 870                 s->field_select[0][0] = s->picture_structure - 1;
 871             }
 872
 873             if (IS_QUANT(mb_type))
 874                 s->qscale = get_qscale(s);
 875
 876             s->last_mv[0][0][0] = 0;
 877             s->last_mv[0][0][1] = 0;
 878             s->last_mv[0][1][0] = 0;
 879             s->last_mv[0][1][1] = 0;
 880             s->mv[0][0][0]      = 0;
 881             s->mv[0][0][1]      = 0;
 882         } else {
 883             av_assert2(mb_type & MB_TYPE_L0L1);
 884             // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
 885             /* get additional motion vector type */
 886             if (s->picture_structure == PICT_FRAME && s->frame_pred_frame_dct) {
 887                 motion_type = MT_FRAME;
 888             } else {
 889                 motion_type = get_bits(&s->gb, 2);
 890                 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
 891                     s->interlaced_dct = get_bits1(&s->gb);
 892             }
 893
 894             if (IS_QUANT(mb_type))
 895                 s->qscale = get_qscale(s);
 896
 897             /* motion vectors */
 898             s->mv_dir = (mb_type >> 13) & 3;
 899             av_dlog(s->avctx, "motion_type=%d\n", motion_type);
 900             switch (motion_type) {
 901             case MT_FRAME: /* or MT_16X8 */
 902                 if (s->picture_structure == PICT_FRAME) {
 903                     mb_type   |= MB_TYPE_16x16;
 904                     s->mv_type = MV_TYPE_16X16;
 905                     for (i = 0; i < 2; i++) {
 906                         if (USES_LIST(mb_type, i)) {
 907                             /* MT_FRAME */
 908                             s->mv[i][0][0]      =
 909                             s->last_mv[i][0][0] =
 910                             s->last_mv[i][1][0] =
 911                                 mpeg_decode_motion(s, s->mpeg_f_code[i][0],
 912                                                    s->last_mv[i][0][0]);
 913                             s->mv[i][0][1]      =
 914                             s->last_mv[i][0][1] =
 915                             s->last_mv[i][1][1] =
 916                                 mpeg_decode_motion(s, s->mpeg_f_code[i][1],
 917                                                    s->last_mv[i][0][1]);
 918                             /* full_pel: only for MPEG-1 */
 919                             if (s->full_pel[i]) {
 920                                 s->mv[i][0][0] <<= 1;
 921                                 s->mv[i][0][1] <<= 1;
 922                             }
 923                         }
 924                     }
 925                 } else {
 926                     mb_type   |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
 927                     s->mv_type = MV_TYPE_16X8;
 928                     for (i = 0; i < 2; i++) {
 929                         if (USES_LIST(mb_type, i)) {
 930                             /* MT_16X8 */
 931                             for (j = 0; j < 2; j++) {
 932                                 s->field_select[i][j] = get_bits1(&s->gb);
 933                                 for (k = 0; k < 2; k++) {
 934                                     val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
 935                                                              s->last_mv[i][j][k]);
 936                                     s->last_mv[i][j][k] = val;
 937                                     s->mv[i][j][k]      = val;
 938                                 }
 939                             }
 940                         }
 941                     }
 942                 }
 943                 break;
 944             case MT_FIELD:
 945                 s->mv_type = MV_TYPE_FIELD;
 946                 if (s->picture_structure == PICT_FRAME) {
 947                     mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
 948                     for (i = 0; i < 2; i++) {
 949                         if (USES_LIST(mb_type, i)) {
 950                             for (j = 0; j < 2; j++) {
 951                                 s->field_select[i][j] = get_bits1(&s->gb);
 952                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
 953                                                          s->last_mv[i][j][0]);
 954                                 s->last_mv[i][j][0] = val;
 955                                 s->mv[i][j][0]      = val;
 956                                 av_dlog(s->avctx, "fmx=%d\n", val);
 957                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
 958                                                          s->last_mv[i][j][1] >> 1);
 959                                 s->last_mv[i][j][1] = val << 1;
 960                                 s->mv[i][j][1]      = val;
 961                                 av_dlog(s->avctx, "fmy=%d\n", val);
 962                             }
 963                         }
 964                     }
 965                 } else {
 966                     av_assert0(!s->progressive_sequence);
 967                     mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
 968                     for (i = 0; i < 2; i++) {
 969                         if (USES_LIST(mb_type, i)) {
 970                             s->field_select[i][0] = get_bits1(&s->gb);
 971                             for (k = 0; k < 2; k++) {
 972                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
 973                                                          s->last_mv[i][0][k]);
 974                                 s->last_mv[i][0][k] = val;
 975                                 s->last_mv[i][1][k] = val;
 976                                 s->mv[i][0][k]      = val;
 977                             }
 978                         }
 979                     }
 980                 }
 981                 break;
 982             case MT_DMV:
 983                 if (s->progressive_sequence){
 984                     av_log(s->avctx, AV_LOG_ERROR, "MT_DMV in progressive_sequence\n");
 985                     return -1;
 986                 }
 987                 s->mv_type = MV_TYPE_DMV;
 988                 for (i = 0; i < 2; i++) {
 989                     if (USES_LIST(mb_type, i)) {
 990                         int dmx, dmy, mx, my, m;
 991                         const int my_shift = s->picture_structure == PICT_FRAME;
 992
 993                         mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
 994                                                 s->last_mv[i][0][0]);
 995                         s->last_mv[i][0][0] = mx;
 996                         s->last_mv[i][1][0] = mx;
 997                         dmx = get_dmv(s);
 998                         my  = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
 999                                                  s->last_mv[i][0][1] >> my_shift);
1000                         dmy = get_dmv(s);
1001
1002
1003                         s->last_mv[i][0][1] = my << my_shift;
1004                         s->last_mv[i][1][1] = my << my_shift;
1005
1006                         s->mv[i][0][0] = mx;
1007                         s->mv[i][0][1] = my;
1008                         s->mv[i][1][0] = mx; // not used
1009                         s->mv[i][1][1] = my; // not used
1010
1011                         if (s->picture_structure == PICT_FRAME) {
1012                             mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1013
1014                             // m = 1 + 2 * s->top_field_first;
1015                             m = s->top_field_first ? 1 : 3;
1016
1017                             /* top -> top pred */
1018                             s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1019                             s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1020                             m = 4 - m;
1021                             s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1022                             s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1023                         } else {
1024                             mb_type |= MB_TYPE_16x16;
1025
1026                             s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1027                             s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1028                             if (s->picture_structure == PICT_TOP_FIELD)
1029                                 s->mv[i][2][1]--;
1030                             else
1031                                 s->mv[i][2][1]++;
1032                         }
1033                     }
1034                 }
1035                 break;
1036             default:
1037                 av_log(s->avctx, AV_LOG_ERROR,
1038                        "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
1039                 return -1;
1040             }
1041         }
1042
1043         s->mb_intra = 0;
1044         if (HAS_CBP(mb_type)) {
1045             s->bdsp.clear_blocks(s->block[0]);
1046
1047             cbp = get_vlc2(&s->gb, ff_mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1048             if (mb_block_count > 6) {
1049                 cbp <<= mb_block_count - 6;
1050                 cbp  |= get_bits(&s->gb, mb_block_count - 6);
1051                 s->bdsp.clear_blocks(s->block[6]);
1052             }
1053             if (cbp <= 0) {
1054                 av_log(s->avctx, AV_LOG_ERROR,
1055                        "invalid cbp %d at %d %d\n", cbp, s->mb_x, s->mb_y);
1056                 return -1;
1057             }
1058
1059             // if 1, we memcpy blocks in xvmcvideo
1060             if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1061                 ff_xvmc_pack_pblocks(s, cbp);
1062
1063             if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
1064                 if (s->flags2 & CODEC_FLAG2_FAST) {
1065                     for (i = 0; i < 6; i++) {
1066                         if (cbp & 32)
1067                             mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
1068                         else
1069                             s->block_last_index[i] = -1;
1070                         cbp += cbp;
1071                     }
1072                 } else {
1073                     cbp <<= 12 - mb_block_count;
1074
1075                     for (i = 0; i < mb_block_count; i++) {
1076                         if (cbp & (1 << 11)) {
1077                             if (mpeg2_decode_block_non_intra(s, *s->pblocks[i], i) < 0)
1078                                 return -1;
1079                         } else {
1080                             s->block_last_index[i] = -1;
1081                         }
1082                         cbp += cbp;
1083                     }
1084                 }
1085             } else {
1086                 if (s->flags2 & CODEC_FLAG2_FAST) {
1087                     for (i = 0; i < 6; i++) {
1088                         if (cbp & 32)
1089                             mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1090                         else
1091                             s->block_last_index[i] = -1;
1092                         cbp += cbp;
1093                     }
1094                 } else {
1095                     for (i = 0; i < 6; i++) {
1096                         if (cbp & 32) {
1097                             if (mpeg1_decode_block_inter(s, *s->pblocks[i], i) < 0)
1098                                 return -1;
1099                         } else {
1100                             s->block_last_index[i] = -1;
1101                         }
1102                         cbp += cbp;
1103                     }
1104                 }
1105             }
1106         } else {
1107             for (i = 0; i < 12; i++)
1108                 s->block_last_index[i] = -1;
1109         }
1110     }
1111
1112     s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1113
1114     return 0;
1115 }
1116
1117 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1118 {
1119     Mpeg1Context *s    = avctx->priv_data;
1120     MpegEncContext *s2 = &s->mpeg_enc_ctx;
1121
1122     ff_mpv_decode_defaults(s2);
1123
1124     if (   avctx->codec_tag != AV_RL32("VCR2")
1125         && avctx->codec_tag != AV_RL32("BW10"))
1126         avctx->coded_width = avctx->coded_height = 0; // do not trust dimensions from input
1127     ff_mpv_decode_init(s2, avctx);
1128
1129     s->mpeg_enc_ctx.avctx  = avctx;
1130
1131     /* we need some permutation to store matrices,
1132      * until the decoder sets the real permutation. */
1133     ff_mpv_idct_init(s2);
1134     ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1135     ff_mpeg12_init_vlcs();
1136
1137     s->mpeg_enc_ctx_allocated      = 0;
1138     s->mpeg_enc_ctx.picture_number = 0;
1139     s->repeat_field                = 0;
1140     s->mpeg_enc_ctx.codec_id       = avctx->codec->id;
1141     avctx->color_range             = AVCOL_RANGE_MPEG;
1142     if (avctx->codec->id == AV_CODEC_ID_MPEG1VIDEO)
1143         avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1144     else
1145         avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
1146     return 0;
1147 }
1148
1149 static int mpeg_decode_update_thread_context(AVCodecContext *avctx,
1150                                              const AVCodecContext *avctx_from)
1151 {
1152     Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1153     MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1154     int err;
1155
1156     if (avctx == avctx_from               ||
1157         !ctx_from->mpeg_enc_ctx_allocated ||
1158         !s1->context_initialized)
1159         return 0;
1160
1161     err = ff_mpeg_update_thread_context(avctx, avctx_from);
1162     if (err)
1163         return err;
1164
1165     if (!ctx->mpeg_enc_ctx_allocated)
1166         memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1167
1168     if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1169         s->picture_number++;
1170
1171     return 0;
1172 }
1173
1174 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1175                                  const uint8_t *new_perm)
1176 {
1177     uint16_t temp_matrix[64];
1178     int i;
1179
1180     memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1181
1182     for (i = 0; i < 64; i++)
1183         matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1184 }
1185
1186 static const enum AVPixelFormat mpeg1_hwaccel_pixfmt_list_420[] = {
1187 #if CONFIG_MPEG1_XVMC_HWACCEL
1188     AV_PIX_FMT_XVMC,
1189 #endif
1190 #if CONFIG_MPEG1_VDPAU_HWACCEL
1191     AV_PIX_FMT_VDPAU_MPEG1,
1192     AV_PIX_FMT_VDPAU,
1193 #endif
1194     AV_PIX_FMT_YUV420P,
1195     AV_PIX_FMT_NONE
1196 };
1197
1198 static const enum AVPixelFormat mpeg2_hwaccel_pixfmt_list_420[] = {
1199 #if CONFIG_MPEG2_XVMC_HWACCEL
1200     AV_PIX_FMT_XVMC,
1201 #endif
1202 #if CONFIG_MPEG2_VDPAU_HWACCEL
1203     AV_PIX_FMT_VDPAU_MPEG2,
1204     AV_PIX_FMT_VDPAU,
1205 #endif
1206 #if CONFIG_MPEG2_DXVA2_HWACCEL
1207     AV_PIX_FMT_DXVA2_VLD,
1208 #endif
1209 #if CONFIG_MPEG2_VAAPI_HWACCEL
1210     AV_PIX_FMT_VAAPI_VLD,
1211 #endif
1212     AV_PIX_FMT_YUV420P,
1213     AV_PIX_FMT_NONE
1214 };
1215
1216 static const enum AVPixelFormat mpeg12_pixfmt_list_422[] = {
1217     AV_PIX_FMT_YUV422P,
1218     AV_PIX_FMT_NONE
1219 };
1220
1221 static const enum AVPixelFormat mpeg12_pixfmt_list_444[] = {
1222     AV_PIX_FMT_YUV444P,
1223     AV_PIX_FMT_NONE
1224 };
1225
1226 static inline int uses_vdpau(AVCodecContext *avctx) {
1227     return avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG1 || avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG2;
1228 }
1229
1230 static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
1231 {
1232     Mpeg1Context *s1  = avctx->priv_data;
1233     MpegEncContext *s = &s1->mpeg_enc_ctx;
1234     const enum AVPixelFormat *pix_fmts;
1235
1236     if (s->chroma_format < 2)
1237         pix_fmts = avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO ?
1238                                 mpeg1_hwaccel_pixfmt_list_420 :
1239                                 mpeg2_hwaccel_pixfmt_list_420;
1240     else if (s->chroma_format == 2)
1241         pix_fmts = mpeg12_pixfmt_list_422;
1242     else
1243         pix_fmts = mpeg12_pixfmt_list_444;
1244
1245     return ff_thread_get_format(avctx, pix_fmts);
1246 }
1247
1248 static void setup_hwaccel_for_pixfmt(AVCodecContext *avctx)
1249 {
1250     // until then pix_fmt may be changed right after codec init
1251     if (avctx->hwaccel || uses_vdpau(avctx))
1252         if (avctx->idct_algo == FF_IDCT_AUTO)
1253             avctx->idct_algo = FF_IDCT_SIMPLE;
1254
1255     if (avctx->hwaccel && avctx->pix_fmt == AV_PIX_FMT_XVMC) {
1256         Mpeg1Context *s1 = avctx->priv_data;
1257         MpegEncContext *s = &s1->mpeg_enc_ctx;
1258
1259         s->pack_pblocks = 1;
1260 #if FF_API_XVMC
1261         avctx->xvmc_acceleration = 2;
1262 #endif /* FF_API_XVMC */
1263     }
1264 }
1265
1266 /* Call this function when we know all parameters.
1267  * It may be called in different places for MPEG-1 and MPEG-2. */
1268 static int mpeg_decode_postinit(AVCodecContext *avctx)
1269 {
1270     Mpeg1Context *s1  = avctx->priv_data;
1271     MpegEncContext *s = &s1->mpeg_enc_ctx;
1272     uint8_t old_permutation[64];
1273     int ret;
1274
1275     if ((s1->mpeg_enc_ctx_allocated == 0)                   ||
1276         avctx->coded_width       != s->width                ||
1277         avctx->coded_height      != s->height               ||
1278         s1->save_width           != s->width                ||
1279         s1->save_height          != s->height               ||
1280         s1->save_aspect_info     != s->aspect_ratio_info    ||
1281         (s1->save_progressive_seq != s->progressive_sequence && FFALIGN(s->height, 16) != FFALIGN(s->height, 32)) ||
1282         0) {
1283         if (s1->mpeg_enc_ctx_allocated) {
1284             ParseContext pc = s->parse_context;
1285             s->parse_context.buffer = 0;
1286             ff_mpv_common_end(s);
1287             s->parse_context = pc;
1288             s1->mpeg_enc_ctx_allocated = 0;
1289         }
1290
1291         if ((s->width == 0) || (s->height == 0))
1292             return -2;
1293
1294         ret = ff_set_dimensions(avctx, s->width, s->height);
1295         if (ret < 0)
1296             return ret;
1297
1298         if (avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->bit_rate) {
1299             avctx->rc_max_rate = s->bit_rate;
1300         } else if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && s->bit_rate &&
1301                    (s->bit_rate != 0x3FFFF*400 || s->vbv_delay != 0xFFFF)) {
1302             avctx->bit_rate = s->bit_rate;
1303         }
1304         s1->save_aspect_info     = s->aspect_ratio_info;
1305         s1->save_width           = s->width;
1306         s1->save_height          = s->height;
1307         s1->save_progressive_seq = s->progressive_sequence;
1308
1309         /* low_delay may be forced, in this case we will have B-frames
1310          * that behave like P-frames. */
1311         avctx->has_b_frames = !s->low_delay;
1312
1313         if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1314             // MPEG-1 fps
1315             avctx->framerate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
1316             // MPEG-1 aspect
1317             avctx->sample_aspect_ratio = av_d2q(1.0 / ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1318             avctx->ticks_per_frame     = 1;
1319         } else { // MPEG-2
1320             // MPEG-2 fps
1321             av_reduce(&s->avctx->framerate.num,
1322                       &s->avctx->framerate.den,
1323                       ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
1324                       ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1325                       1 << 30);
1326             avctx->ticks_per_frame = 2;
1327             // MPEG-2 aspect
1328             if (s->aspect_ratio_info > 1) {
1329                 AVRational dar =
1330                     av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1331                                       (AVRational) { s1->pan_scan.width,
1332                                                      s1->pan_scan.height }),
1333                              (AVRational) { s->width, s->height });
1334
1335                 /* We ignore the spec here and guess a bit as reality does not
1336                  * match the spec, see for example res_change_ffmpeg_aspect.ts
1337                  * and sequence-display-aspect.mpg.
1338                  * issue1613, 621, 562 */
1339                 if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1340                     (av_cmp_q(dar, (AVRational) { 4, 3 }) &&
1341                      av_cmp_q(dar, (AVRational) { 16, 9 }))) {
1342                     s->avctx->sample_aspect_ratio =
1343                         av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1344                                  (AVRational) { s->width, s->height });
1345                 } else {
1346                     s->avctx->sample_aspect_ratio =
1347                         av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1348                                  (AVRational) { s1->pan_scan.width, s1->pan_scan.height });
1349 // issue1613 4/3 16/9 -> 16/9
1350 // res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1351 // widescreen-issue562.mpg 4/3 16/9 -> 16/9
1352 //                    s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1353                     av_dlog(avctx, "A %d/%d\n",
1354                             ff_mpeg2_aspect[s->aspect_ratio_info].num,
1355                             ff_mpeg2_aspect[s->aspect_ratio_info].den);
1356                     av_dlog(avctx, "B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1357                             s->avctx->sample_aspect_ratio.den);
1358                 }
1359             } else {
1360                 s->avctx->sample_aspect_ratio =
1361                     ff_mpeg2_aspect[s->aspect_ratio_info];
1362             }
1363         } // MPEG-2
1364
1365         ff_set_sar(s->avctx, s->avctx->sample_aspect_ratio);
1366
1367         avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1368         setup_hwaccel_for_pixfmt(avctx);
1369
1370         /* Quantization matrices may need reordering
1371          * if DCT permutation is changed. */
1372         memcpy(old_permutation, s->idsp.idct_permutation, 64 * sizeof(uint8_t));
1373
1374         ff_mpv_idct_init(s);
1375         if (ff_mpv_common_init(s) < 0)
1376             return -2;
1377
1378         quant_matrix_rebuild(s->intra_matrix,        old_permutation, s->idsp.idct_permutation);
1379         quant_matrix_rebuild(s->inter_matrix,        old_permutation, s->idsp.idct_permutation);
1380         quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->idsp.idct_permutation);
1381         quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->idsp.idct_permutation);
1382
1383         s1->mpeg_enc_ctx_allocated = 1;
1384     }
1385     return 0;
1386 }
1387
1388 static int mpeg1_decode_picture(AVCodecContext *avctx, const uint8_t *buf,
1389                                 int buf_size)
1390 {
1391     Mpeg1Context *s1  = avctx->priv_data;
1392     MpegEncContext *s = &s1->mpeg_enc_ctx;
1393     int ref, f_code, vbv_delay;
1394
1395     init_get_bits(&s->gb, buf, buf_size * 8);
1396
1397     ref = get_bits(&s->gb, 10); /* temporal ref */
1398     s->pict_type = get_bits(&s->gb, 3);
1399     if (s->pict_type == 0 || s->pict_type > 3)
1400         return -1;
1401
1402     vbv_delay = get_bits(&s->gb, 16);
1403     s->vbv_delay = vbv_delay;
1404     if (s->pict_type == AV_PICTURE_TYPE_P ||
1405         s->pict_type == AV_PICTURE_TYPE_B) {
1406         s->full_pel[0] = get_bits1(&s->gb);
1407         f_code = get_bits(&s->gb, 3);
1408         if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1409             return -1;
1410         f_code += !f_code;
1411         s->mpeg_f_code[0][0] = f_code;
1412         s->mpeg_f_code[0][1] = f_code;
1413     }
1414     if (s->pict_type == AV_PICTURE_TYPE_B) {
1415         s->full_pel[1] = get_bits1(&s->gb);
1416         f_code = get_bits(&s->gb, 3);
1417         if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1418             return -1;
1419         f_code += !f_code;
1420         s->mpeg_f_code[1][0] = f_code;
1421         s->mpeg_f_code[1][1] = f_code;
1422     }
1423     s->current_picture.f->pict_type = s->pict_type;
1424     s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1425
1426     if (avctx->debug & FF_DEBUG_PICT_INFO)
1427         av_log(avctx, AV_LOG_DEBUG,
1428                "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1429
1430     s->y_dc_scale = 8;
1431     s->c_dc_scale = 8;
1432     return 0;
1433 }
1434
1435 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1436 {
1437     MpegEncContext *s = &s1->mpeg_enc_ctx;
1438     int horiz_size_ext, vert_size_ext;
1439     int bit_rate_ext;
1440
1441     skip_bits(&s->gb, 1); /* profile and level esc*/
1442     s->avctx->profile       = get_bits(&s->gb, 3);
1443     s->avctx->level         = get_bits(&s->gb, 4);
1444     s->progressive_sequence = get_bits1(&s->gb);   /* progressive_sequence */
1445     s->chroma_format        = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1446     horiz_size_ext          = get_bits(&s->gb, 2);
1447     vert_size_ext           = get_bits(&s->gb, 2);
1448     s->width  |= (horiz_size_ext << 12);
1449     s->height |= (vert_size_ext  << 12);
1450     bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1451     s->bit_rate += (bit_rate_ext << 18) * 400;
1452     skip_bits1(&s->gb); /* marker */
1453     s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1454
1455     s->low_delay = get_bits1(&s->gb);
1456     if (s->flags & CODEC_FLAG_LOW_DELAY)
1457         s->low_delay = 1;
1458
1459     s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1460     s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1461
1462     av_dlog(s->avctx, "sequence extension\n");
1463     s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1464
1465     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1466         av_log(s->avctx, AV_LOG_DEBUG,
1467                "profile: %d, level: %d ps: %d cf:%d vbv buffer: %d, bitrate:%d\n",
1468                s->avctx->profile, s->avctx->level, s->progressive_sequence, s->chroma_format,
1469                s->avctx->rc_buffer_size, s->bit_rate);
1470 }
1471
1472 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1473 {
1474     MpegEncContext *s = &s1->mpeg_enc_ctx;
1475     int color_description, w, h;
1476
1477     skip_bits(&s->gb, 3); /* video format */
1478     color_description = get_bits1(&s->gb);
1479     if (color_description) {
1480         s->avctx->color_primaries = get_bits(&s->gb, 8);
1481         s->avctx->color_trc       = get_bits(&s->gb, 8);
1482         s->avctx->colorspace      = get_bits(&s->gb, 8);
1483     }
1484     w = get_bits(&s->gb, 14);
1485     skip_bits(&s->gb, 1); // marker
1486     h = get_bits(&s->gb, 14);
1487     // remaining 3 bits are zero padding
1488
1489     s1->pan_scan.width  = 16 * w;
1490     s1->pan_scan.height = 16 * h;
1491
1492     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1493         av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1494 }
1495
1496 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1497 {
1498     MpegEncContext *s = &s1->mpeg_enc_ctx;
1499     int i, nofco;
1500
1501     nofco = 1;
1502     if (s->progressive_sequence) {
1503         if (s->repeat_first_field) {
1504             nofco++;
1505             if (s->top_field_first)
1506                 nofco++;
1507         }
1508     } else {
1509         if (s->picture_structure == PICT_FRAME) {
1510             nofco++;
1511             if (s->repeat_first_field)
1512                 nofco++;
1513         }
1514     }
1515     for (i = 0; i < nofco; i++) {
1516         s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1517         skip_bits(&s->gb, 1); // marker
1518         s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1519         skip_bits(&s->gb, 1); // marker
1520     }
1521
1522     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1523         av_log(s->avctx, AV_LOG_DEBUG,
1524                "pde (%"PRId16",%"PRId16") (%"PRId16",%"PRId16") (%"PRId16",%"PRId16")\n",
1525                s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1526                s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1527                s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1528 }
1529
1530 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64],
1531                        uint16_t matrix1[64], int intra)
1532 {
1533     int i;
1534
1535     for (i = 0; i < 64; i++) {
1536         int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1537         int v = get_bits(&s->gb, 8);
1538         if (v == 0) {
1539             av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1540             return -1;
1541         }
1542         if (intra && i == 0 && v != 8) {
1543             av_log(s->avctx, AV_LOG_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v);
1544             v = 8; // needed by pink.mpg / issue1046
1545         }
1546         matrix0[j] = v;
1547         if (matrix1)
1548             matrix1[j] = v;
1549     }
1550     return 0;
1551 }
1552
1553 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1554 {
1555     av_dlog(s->avctx, "matrix extension\n");
1556
1557     if (get_bits1(&s->gb))
1558         load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1559     if (get_bits1(&s->gb))
1560         load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1561     if (get_bits1(&s->gb))
1562         load_matrix(s, s->chroma_intra_matrix, NULL, 1);
1563     if (get_bits1(&s->gb))
1564         load_matrix(s, s->chroma_inter_matrix, NULL, 0);
1565 }
1566
1567 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1568 {
1569     MpegEncContext *s = &s1->mpeg_enc_ctx;
1570
1571     s->full_pel[0]       = s->full_pel[1] = 0;
1572     s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1573     s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1574     s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1575     s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1576     if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1577         av_log(s->avctx, AV_LOG_ERROR,
1578                "Missing picture start code, guessing missing values\n");
1579         if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1580             if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1581                 s->pict_type = AV_PICTURE_TYPE_I;
1582             else
1583                 s->pict_type = AV_PICTURE_TYPE_P;
1584         } else
1585             s->pict_type = AV_PICTURE_TYPE_B;
1586         s->current_picture.f->pict_type = s->pict_type;
1587         s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1588     }
1589     s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0];
1590     s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1];
1591     s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0];
1592     s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1];
1593
1594     s->intra_dc_precision         = get_bits(&s->gb, 2);
1595     s->picture_structure          = get_bits(&s->gb, 2);
1596     s->top_field_first            = get_bits1(&s->gb);
1597     s->frame_pred_frame_dct       = get_bits1(&s->gb);
1598     s->concealment_motion_vectors = get_bits1(&s->gb);
1599     s->q_scale_type               = get_bits1(&s->gb);
1600     s->intra_vlc_format           = get_bits1(&s->gb);
1601     s->alternate_scan             = get_bits1(&s->gb);
1602     s->repeat_first_field         = get_bits1(&s->gb);
1603     s->chroma_420_type            = get_bits1(&s->gb);
1604     s->progressive_frame          = get_bits1(&s->gb);
1605
1606     if (s->alternate_scan) {
1607         ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1608         ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1609     } else {
1610         ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1611         ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1612     }
1613
1614     /* composite display not parsed */
1615     av_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1616     av_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1617     av_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1618     av_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1619     av_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1620     av_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1621     av_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1622     av_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1623     av_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1624 }
1625
1626 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1627 {
1628     AVCodecContext *avctx = s->avctx;
1629     Mpeg1Context *s1      = (Mpeg1Context *) s;
1630
1631     /* start frame decoding */
1632     if (s->first_field || s->picture_structure == PICT_FRAME) {
1633         AVFrameSideData *pan_scan;
1634
1635         if (ff_mpv_frame_start(s, avctx) < 0)
1636             return -1;
1637
1638         ff_mpeg_er_frame_start(s);
1639
1640         /* first check if we must repeat the frame */
1641         s->current_picture_ptr->f->repeat_pict = 0;
1642         if (s->repeat_first_field) {
1643             if (s->progressive_sequence) {
1644                 if (s->top_field_first)
1645                     s->current_picture_ptr->f->repeat_pict = 4;
1646                 else
1647                     s->current_picture_ptr->f->repeat_pict = 2;
1648             } else if (s->progressive_frame) {
1649                 s->current_picture_ptr->f->repeat_pict = 1;
1650             }
1651         }
1652
1653         pan_scan = av_frame_new_side_data(s->current_picture_ptr->f,
1654                                           AV_FRAME_DATA_PANSCAN,
1655                                           sizeof(s1->pan_scan));
1656         if (!pan_scan)
1657             return AVERROR(ENOMEM);
1658         memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
1659
1660         if (s1->a53_caption) {
1661             AVFrameSideData *sd = av_frame_new_side_data(
1662                 s->current_picture_ptr->f, AV_FRAME_DATA_A53_CC,
1663                 s1->a53_caption_size);
1664             if (sd)
1665                 memcpy(sd->data, s1->a53_caption, s1->a53_caption_size);
1666             av_freep(&s1->a53_caption);
1667         }
1668
1669         if (s1->has_stereo3d) {
1670             AVStereo3D *stereo = av_stereo3d_create_side_data(s->current_picture_ptr->f);
1671             if (!stereo)
1672                 return AVERROR(ENOMEM);
1673
1674             *stereo = s1->stereo3d;
1675             s1->has_stereo3d = 0;
1676         }
1677
1678         if (s1->has_afd) {
1679             AVFrameSideData *sd =
1680                 av_frame_new_side_data(s->current_picture_ptr->f,
1681                                        AV_FRAME_DATA_AFD, 1);
1682             if (!sd)
1683                 return AVERROR(ENOMEM);
1684
1685             *sd->data   = s1->afd;
1686             s1->has_afd = 0;
1687         }
1688
1689         if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1690             ff_thread_finish_setup(avctx);
1691     } else { // second field
1692         int i;
1693
1694         if (!s->current_picture_ptr) {
1695             av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1696             return -1;
1697         }
1698
1699         if (s->avctx->hwaccel &&
1700             (s->avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
1701             if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1702                 av_log(avctx, AV_LOG_ERROR,
1703                        "hardware accelerator failed to decode first field\n");
1704         }
1705
1706         for (i = 0; i < 4; i++) {
1707             s->current_picture.f->data[i] = s->current_picture_ptr->f->data[i];
1708             if (s->picture_structure == PICT_BOTTOM_FIELD)
1709                 s->current_picture.f->data[i] +=
1710                     s->current_picture_ptr->f->linesize[i];
1711         }
1712     }
1713
1714     if (avctx->hwaccel) {
1715         if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
1716             return -1;
1717     }
1718
1719     return 0;
1720 }
1721
1722 #define DECODE_SLICE_ERROR -1
1723 #define DECODE_SLICE_OK     0
1724
1725 /**
1726  * Decode a slice.
1727  * MpegEncContext.mb_y must be set to the MB row from the startcode.
1728  * @return DECODE_SLICE_ERROR if the slice is damaged,
1729  *         DECODE_SLICE_OK if this slice is OK
1730  */
1731 static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1732                              const uint8_t **buf, int buf_size)
1733 {
1734     AVCodecContext *avctx = s->avctx;
1735     const int lowres      = s->avctx->lowres;
1736     const int field_pic   = s->picture_structure != PICT_FRAME;
1737
1738     s->resync_mb_x =
1739     s->resync_mb_y = -1;
1740
1741     av_assert0(mb_y < s->mb_height);
1742
1743     init_get_bits(&s->gb, *buf, buf_size * 8);
1744     if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1745         skip_bits(&s->gb, 3);
1746
1747     ff_mpeg1_clean_buffers(s);
1748     s->interlaced_dct = 0;
1749
1750     s->qscale = get_qscale(s);
1751
1752     if (s->qscale == 0) {
1753         av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1754         return -1;
1755     }
1756
1757     /* extra slice info */
1758     if (skip_1stop_8data_bits(&s->gb) < 0)
1759         return AVERROR_INVALIDDATA;
1760
1761     s->mb_x = 0;
1762
1763     if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1764         skip_bits1(&s->gb);
1765     } else {
1766         while (get_bits_left(&s->gb) > 0) {
1767             int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1768                                 MBINCR_VLC_BITS, 2);
1769             if (code < 0) {
1770                 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1771                 return -1;
1772             }
1773             if (code >= 33) {
1774                 if (code == 33)
1775                     s->mb_x += 33;
1776                 /* otherwise, stuffing, nothing to do */
1777             } else {
1778                 s->mb_x += code;
1779                 break;
1780             }
1781         }
1782     }
1783
1784     if (s->mb_x >= (unsigned) s->mb_width) {
1785         av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1786         return -1;
1787     }
1788
1789     if (avctx->hwaccel && avctx->hwaccel->decode_slice) {
1790         const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1791         int start_code = -1;
1792         buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1793         if (buf_end < *buf + buf_size)
1794             buf_end -= 4;
1795         s->mb_y = mb_y;
1796         if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1797             return DECODE_SLICE_ERROR;
1798         *buf = buf_end;
1799         return DECODE_SLICE_OK;
1800     }
1801
1802     s->resync_mb_x = s->mb_x;
1803     s->resync_mb_y = s->mb_y = mb_y;
1804     s->mb_skip_run = 0;
1805     ff_init_block_index(s);
1806
1807     if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1808         if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1809             av_log(s->avctx, AV_LOG_DEBUG,
1810                    "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",
1811                    s->qscale,
1812                    s->mpeg_f_code[0][0], s->mpeg_f_code[0][1],
1813                    s->mpeg_f_code[1][0], s->mpeg_f_code[1][1],
1814                    s->pict_type  == AV_PICTURE_TYPE_I ? "I" :
1815                    (s->pict_type == AV_PICTURE_TYPE_P ? "P" :
1816                    (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
1817                    s->progressive_sequence ? "ps"  : "",
1818                    s->progressive_frame    ? "pf"  : "",
1819                    s->alternate_scan       ? "alt" : "",
1820                    s->top_field_first      ? "top" : "",
1821                    s->intra_dc_precision, s->picture_structure,
1822                    s->frame_pred_frame_dct, s->concealment_motion_vectors,
1823                    s->q_scale_type, s->intra_vlc_format,
1824                    s->repeat_first_field, s->chroma_420_type ? "420" : "");
1825         }
1826     }
1827
1828     for (;;) {
1829         // If 1, we memcpy blocks in xvmcvideo.
1830         if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1831             ff_xvmc_init_block(s); // set s->block
1832
1833         if (mpeg_decode_mb(s, s->block) < 0)
1834             return -1;
1835
1836         // Note motion_val is normally NULL unless we want to extract the MVs.
1837         if (s->current_picture.motion_val[0] && !s->encoding) {
1838             const int wrap = s->b8_stride;
1839             int xy         = s->mb_x * 2 + s->mb_y * 2 * wrap;
1840             int b8_xy      = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1841             int motion_x, motion_y, dir, i;
1842
1843             for (i = 0; i < 2; i++) {
1844                 for (dir = 0; dir < 2; dir++) {
1845                     if (s->mb_intra ||
1846                         (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1847                         motion_x = motion_y = 0;
1848                     } else if (s->mv_type == MV_TYPE_16X16 ||
1849                                (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1850                         motion_x = s->mv[dir][0][0];
1851                         motion_y = s->mv[dir][0][1];
1852                     } else { /* if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8)) */
1853                         motion_x = s->mv[dir][i][0];
1854                         motion_y = s->mv[dir][i][1];
1855                     }
1856
1857                     s->current_picture.motion_val[dir][xy][0]     = motion_x;
1858                     s->current_picture.motion_val[dir][xy][1]     = motion_y;
1859                     s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1860                     s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1861                     s->current_picture.ref_index [dir][b8_xy]     =
1862                     s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1863                     av_assert2(s->field_select[dir][i] == 0 ||
1864                                s->field_select[dir][i] == 1);
1865                 }
1866                 xy    += wrap;
1867                 b8_xy += 2;
1868             }
1869         }
1870
1871         s->dest[0] += 16 >> lowres;
1872         s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1873         s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1874
1875         ff_mpv_decode_mb(s, s->block);
1876
1877         if (++s->mb_x >= s->mb_width) {
1878             const int mb_size = 16 >> s->avctx->lowres;
1879
1880             ff_mpeg_draw_horiz_band(s, mb_size * (s->mb_y >> field_pic), mb_size);
1881             ff_mpv_report_decode_progress(s);
1882
1883             s->mb_x  = 0;
1884             s->mb_y += 1 << field_pic;
1885
1886             if (s->mb_y >= s->mb_height) {
1887                 int left   = get_bits_left(&s->gb);
1888                 int is_d10 = s->chroma_format == 2 &&
1889                              s->pict_type == AV_PICTURE_TYPE_I &&
1890                              avctx->profile == 0 && avctx->level == 5 &&
1891                              s->intra_dc_precision == 2 &&
1892                              s->q_scale_type == 1 && s->alternate_scan == 0 &&
1893                              s->progressive_frame == 0
1894                              /* vbv_delay == 0xBBB || 0xE10 */;
1895
1896                 if (left >= 32 && !is_d10) {
1897                     GetBitContext gb = s->gb;
1898                     align_get_bits(&gb);
1899                     if (show_bits(&gb, 24) == 0x060E2B) {
1900                         av_log(avctx, AV_LOG_DEBUG, "Invalid MXF data found in video stream\n");
1901                         is_d10 = 1;
1902                     }
1903                 }
1904
1905                 if (left < 0 ||
1906                     (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10) ||
1907                     ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
1908                     av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n",
1909                            left, show_bits(&s->gb, FFMIN(left, 23)));
1910                     return -1;
1911                 } else
1912                     goto eos;
1913             }
1914             // There are some files out there which are missing the last slice
1915             // in cases where the slice is completely outside the visible
1916             // area, we detect this here instead of running into the end expecting
1917             // more data
1918             if (s->mb_y >= ((s->height + 15) >> 4) &&
1919                 s->progressive_frame &&
1920                 !s->progressive_sequence &&
1921                 get_bits_left(&s->gb) <= 8 &&
1922                 get_bits_left(&s->gb) >= 0 &&
1923                 s->mb_skip_run == -1 &&
1924                 show_bits(&s->gb, 8) == 0)
1925                 goto eos;
1926
1927             ff_init_block_index(s);
1928         }
1929
1930         /* skip mb handling */
1931         if (s->mb_skip_run == -1) {
1932             /* read increment again */
1933             s->mb_skip_run = 0;
1934             for (;;) {
1935                 int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1936                                     MBINCR_VLC_BITS, 2);
1937                 if (code < 0) {
1938                     av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1939                     return -1;
1940                 }
1941                 if (code >= 33) {
1942                     if (code == 33) {
1943                         s->mb_skip_run += 33;
1944                     } else if (code == 35) {
1945                         if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1946                             av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1947                             return -1;
1948                         }
1949                         goto eos; /* end of slice */
1950                     }
1951                     /* otherwise, stuffing, nothing to do */
1952                 } else {
1953                     s->mb_skip_run += code;
1954                     break;
1955                 }
1956             }
1957             if (s->mb_skip_run) {
1958                 int i;
1959                 if (s->pict_type == AV_PICTURE_TYPE_I) {
1960                     av_log(s->avctx, AV_LOG_ERROR,
1961                            "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1962                     return -1;
1963                 }
1964
1965                 /* skip mb */
1966                 s->mb_intra = 0;
1967                 for (i = 0; i < 12; i++)
1968                     s->block_last_index[i] = -1;
1969                 if (s->picture_structure == PICT_FRAME)
1970                     s->mv_type = MV_TYPE_16X16;
1971                 else
1972                     s->mv_type = MV_TYPE_FIELD;
1973                 if (s->pict_type == AV_PICTURE_TYPE_P) {
1974                     /* if P type, zero motion vector is implied */
1975                     s->mv_dir             = MV_DIR_FORWARD;
1976                     s->mv[0][0][0]        = s->mv[0][0][1]      = 0;
1977                     s->last_mv[0][0][0]   = s->last_mv[0][0][1] = 0;
1978                     s->last_mv[0][1][0]   = s->last_mv[0][1][1] = 0;
1979                     s->field_select[0][0] = (s->picture_structure - 1) & 1;
1980                 } else {
1981                     /* if B type, reuse previous vectors and directions */
1982                     s->mv[0][0][0] = s->last_mv[0][0][0];
1983                     s->mv[0][0][1] = s->last_mv[0][0][1];
1984                     s->mv[1][0][0] = s->last_mv[1][0][0];
1985                     s->mv[1][0][1] = s->last_mv[1][0][1];
1986                 }
1987             }
1988         }
1989     }
1990 eos: // end of slice
1991     if (get_bits_left(&s->gb) < 0) {
1992         av_log(s, AV_LOG_ERROR, "overread %d\n", -get_bits_left(&s->gb));
1993         return AVERROR_INVALIDDATA;
1994     }
1995     *buf += (get_bits_count(&s->gb) - 1) / 8;
1996     av_dlog(s, "y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1997     return 0;
1998 }
1999
2000 static int slice_decode_thread(AVCodecContext *c, void *arg)
2001 {
2002     MpegEncContext *s   = *(void **) arg;
2003     const uint8_t *buf  = s->gb.buffer;
2004     int mb_y            = s->start_mb_y;
2005     const int field_pic = s->picture_structure != PICT_FRAME;
2006
2007     s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
2008
2009     for (;;) {
2010         uint32_t start_code;
2011         int ret;
2012
2013         ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
2014         emms_c();
2015         av_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
2016                 ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
2017                 s->start_mb_y, s->end_mb_y, s->er.error_count);
2018         if (ret < 0) {
2019             if (c->err_recognition & AV_EF_EXPLODE)
2020                 return ret;
2021             if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
2022                 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2023                                 s->mb_x, s->mb_y,
2024                                 ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2025         } else {
2026             ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2027                             s->mb_x - 1, s->mb_y,
2028                             ER_AC_END | ER_DC_END | ER_MV_END);
2029         }
2030
2031         if (s->mb_y == s->end_mb_y)
2032             return 0;
2033
2034         start_code = -1;
2035         buf        = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
2036         mb_y       = start_code - SLICE_MIN_START_CODE;
2037         if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
2038             mb_y += (*buf&0xE0)<<2;
2039         mb_y <<= field_pic;
2040         if (s->picture_structure == PICT_BOTTOM_FIELD)
2041             mb_y++;
2042         if (mb_y < 0 || mb_y >= s->end_mb_y)
2043             return -1;
2044     }
2045 }
2046
2047 /**
2048  * Handle slice ends.
2049  * @return 1 if it seems to be the last slice
2050  */
2051 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2052 {
2053     Mpeg1Context *s1  = avctx->priv_data;
2054     MpegEncContext *s = &s1->mpeg_enc_ctx;
2055
2056     if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2057         return 0;
2058
2059     if (s->avctx->hwaccel) {
2060         if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
2061             av_log(avctx, AV_LOG_ERROR,
2062                    "hardware accelerator failed to decode picture\n");
2063     }
2064
2065     /* end of slice reached */
2066     if (/* s->mb_y << field_pic == s->mb_height && */ !s->first_field && !s1->first_slice) {
2067         /* end of image */
2068
2069         ff_er_frame_end(&s->er);
2070
2071         ff_mpv_frame_end(s);
2072
2073         if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
2074             int ret = av_frame_ref(pict, s->current_picture_ptr->f);
2075             if (ret < 0)
2076                 return ret;
2077             ff_print_debug_info(s, s->current_picture_ptr, pict);
2078             ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2079         } else {
2080             if (avctx->active_thread_type & FF_THREAD_FRAME)
2081                 s->picture_number++;
2082             /* latency of 1 frame for I- and P-frames */
2083             /* XXX: use another variable than picture_number */
2084             if (s->last_picture_ptr) {
2085                 int ret = av_frame_ref(pict, s->last_picture_ptr->f);
2086                 if (ret < 0)
2087                     return ret;
2088                 ff_print_debug_info(s, s->last_picture_ptr, pict);
2089                 ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2090             }
2091         }
2092
2093         return 1;
2094     } else {
2095         return 0;
2096     }
2097 }
2098
2099 static int mpeg1_decode_sequence(AVCodecContext *avctx,
2100                                  const uint8_t *buf, int buf_size)
2101 {
2102     Mpeg1Context *s1  = avctx->priv_data;
2103     MpegEncContext *s = &s1->mpeg_enc_ctx;
2104     int width, height;
2105     int i, v, j;
2106
2107     init_get_bits(&s->gb, buf, buf_size * 8);
2108
2109     width  = get_bits(&s->gb, 12);
2110     height = get_bits(&s->gb, 12);
2111     if (width == 0 || height == 0) {
2112         av_log(avctx, AV_LOG_WARNING,
2113                "Invalid horizontal or vertical size value.\n");
2114         if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2115             return AVERROR_INVALIDDATA;
2116     }
2117     s->aspect_ratio_info = get_bits(&s->gb, 4);
2118     if (s->aspect_ratio_info == 0) {
2119         av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2120         if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2121             return -1;
2122     }
2123     s->frame_rate_index = get_bits(&s->gb, 4);
2124     if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
2125         return -1;
2126     s->bit_rate = get_bits(&s->gb, 18) * 400;
2127     if (get_bits1(&s->gb) == 0) /* marker */
2128         return -1;
2129     s->width  = width;
2130     s->height = height;
2131
2132     s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2133     skip_bits(&s->gb, 1);
2134
2135     /* get matrix */
2136     if (get_bits1(&s->gb)) {
2137         load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2138     } else {
2139         for (i = 0; i < 64; i++) {
2140             j = s->idsp.idct_permutation[i];
2141             v = ff_mpeg1_default_intra_matrix[i];
2142             s->intra_matrix[j]        = v;
2143             s->chroma_intra_matrix[j] = v;
2144         }
2145     }
2146     if (get_bits1(&s->gb)) {
2147         load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2148     } else {
2149         for (i = 0; i < 64; i++) {
2150             int j = s->idsp.idct_permutation[i];
2151             v = ff_mpeg1_default_non_intra_matrix[i];
2152             s->inter_matrix[j]        = v;
2153             s->chroma_inter_matrix[j] = v;
2154         }
2155     }
2156
2157     if (show_bits(&s->gb, 23) != 0) {
2158         av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2159         return -1;
2160     }
2161
2162     /* We set MPEG-2 parameters so that it emulates MPEG-1. */
2163     s->progressive_sequence = 1;
2164     s->progressive_frame    = 1;
2165     s->picture_structure    = PICT_FRAME;
2166     s->first_field          = 0;
2167     s->frame_pred_frame_dct = 1;
2168     s->chroma_format        = 1;
2169     s->codec_id             =
2170     s->avctx->codec_id      = AV_CODEC_ID_MPEG1VIDEO;
2171     s->out_format           = FMT_MPEG1;
2172     s->swap_uv              = 0; // AFAIK VCR2 does not have SEQ_HEADER
2173     if (s->flags & CODEC_FLAG_LOW_DELAY)
2174         s->low_delay = 1;
2175
2176     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2177         av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d, aspect_ratio_info: %d \n",
2178                s->avctx->rc_buffer_size, s->bit_rate, s->aspect_ratio_info);
2179
2180     return 0;
2181 }
2182
2183 static int vcr2_init_sequence(AVCodecContext *avctx)
2184 {
2185     Mpeg1Context *s1  = avctx->priv_data;
2186     MpegEncContext *s = &s1->mpeg_enc_ctx;
2187     int i, v;
2188
2189     /* start new MPEG-1 context decoding */
2190     s->out_format = FMT_MPEG1;
2191     if (s1->mpeg_enc_ctx_allocated) {
2192         ff_mpv_common_end(s);
2193         s1->mpeg_enc_ctx_allocated = 0;
2194     }
2195     s->width            = avctx->coded_width;
2196     s->height           = avctx->coded_height;
2197     avctx->has_b_frames = 0; // true?
2198     s->low_delay        = 1;
2199
2200     avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2201     setup_hwaccel_for_pixfmt(avctx);
2202
2203     ff_mpv_idct_init(s);
2204     if (ff_mpv_common_init(s) < 0)
2205         return -1;
2206     s1->mpeg_enc_ctx_allocated = 1;
2207
2208     for (i = 0; i < 64; i++) {
2209         int j = s->idsp.idct_permutation[i];
2210         v = ff_mpeg1_default_intra_matrix[i];
2211         s->intra_matrix[j]        = v;
2212         s->chroma_intra_matrix[j] = v;
2213
2214         v = ff_mpeg1_default_non_intra_matrix[i];
2215         s->inter_matrix[j]        = v;
2216         s->chroma_inter_matrix[j] = v;
2217     }
2218
2219     s->progressive_sequence  = 1;
2220     s->progressive_frame     = 1;
2221     s->picture_structure     = PICT_FRAME;
2222     s->first_field           = 0;
2223     s->frame_pred_frame_dct  = 1;
2224     s->chroma_format         = 1;
2225     if (s->codec_tag == AV_RL32("BW10")) {
2226         s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2227     } else {
2228         s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
2229         s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
2230     }
2231     s1->save_width           = s->width;
2232     s1->save_height          = s->height;
2233     s1->save_progressive_seq = s->progressive_sequence;
2234     return 0;
2235 }
2236
2237 static int mpeg_decode_a53_cc(AVCodecContext *avctx,
2238                               const uint8_t *p, int buf_size)
2239 {
2240     Mpeg1Context *s1 = avctx->priv_data;
2241
2242     if (buf_size >= 6 &&
2243         p[0] == 'G' && p[1] == 'A' && p[2] == '9' && p[3] == '4' &&
2244         p[4] == 3 && (p[5] & 0x40)) {
2245         /* extract A53 Part 4 CC data */
2246         int cc_count = p[5] & 0x1f;
2247         if (cc_count > 0 && buf_size >= 7 + cc_count * 3) {
2248             av_freep(&s1->a53_caption);
2249             s1->a53_caption_size = cc_count * 3;
2250             s1->a53_caption      = av_malloc(s1->a53_caption_size);
2251             if (s1->a53_caption)
2252                 memcpy(s1->a53_caption, p + 7, s1->a53_caption_size);
2253         }
2254         return 1;
2255     } else if (buf_size >= 11 &&
2256                p[0] == 'C' && p[1] == 'C' && p[2] == 0x01 && p[3] == 0xf8) {
2257         /* extract DVD CC data */
2258         int cc_count = 0;
2259         int i;
2260         // There is a caption count field in the data, but it is often
2261         // incorect.  So count the number of captions present.
2262         for (i = 5; i + 6 <= buf_size && ((p[i] & 0xfe) == 0xfe); i += 6)
2263             cc_count++;
2264         // Transform the DVD format into A53 Part 4 format
2265         if (cc_count > 0) {
2266             av_freep(&s1->a53_caption);
2267             s1->a53_caption_size = cc_count * 6;
2268             s1->a53_caption      = av_malloc(s1->a53_caption_size);
2269             if (s1->a53_caption) {
2270                 uint8_t field1 = !!(p[4] & 0x80);
2271                 uint8_t *cap = s1->a53_caption;
2272                 p += 5;
2273                 for (i = 0; i < cc_count; i++) {
2274                     cap[0] = (p[0] == 0xff && field1) ? 0xfc : 0xfd;
2275                     cap[1] = p[1];
2276                     cap[2] = p[2];
2277                     cap[3] = (p[3] == 0xff && !field1) ? 0xfc : 0xfd;
2278                     cap[4] = p[4];
2279                     cap[5] = p[5];
2280                     cap += 6;
2281                     p += 6;
2282                 }
2283             }
2284         }
2285         return 1;
2286     }
2287     return 0;
2288 }
2289
2290 static void mpeg_decode_user_data(AVCodecContext *avctx,
2291                                   const uint8_t *p, int buf_size)
2292 {
2293     Mpeg1Context *s = avctx->priv_data;
2294     const uint8_t *buf_end = p + buf_size;
2295     Mpeg1Context *s1 = avctx->priv_data;
2296
2297     if (buf_size > 29){
2298         int i;
2299         for(i=0; i<20; i++)
2300             if (!memcmp(p+i, "\0TMPGEXS\0", 9)){
2301                 s->tmpgexs= 1;
2302             }
2303
2304 /*        for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i<buf_size; i++){
2305             av_log(avctx, AV_LOG_ERROR, "%c", p[i]);
2306         }
2307             av_log(avctx, AV_LOG_ERROR, "\n");*/
2308     }
2309
2310     /* we parse the DTG active format information */
2311     if (buf_end - p >= 5 &&
2312         p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2313         int flags = p[4];
2314         p += 5;
2315         if (flags & 0x80) {
2316             /* skip event id */
2317             p += 2;
2318         }
2319         if (flags & 0x40) {
2320             if (buf_end - p < 1)
2321                 return;
2322 #if FF_API_AFD
2323 FF_DISABLE_DEPRECATION_WARNINGS
2324             avctx->dtg_active_format = p[0] & 0x0f;
2325 FF_ENABLE_DEPRECATION_WARNINGS
2326 #endif /* FF_API_AFD */
2327             s1->has_afd = 1;
2328             s1->afd     = p[0] & 0x0f;
2329         }
2330     } else if (buf_end - p >= 6 &&
2331                p[0] == 'J' && p[1] == 'P' && p[2] == '3' && p[3] == 'D' &&
2332                p[4] == 0x03) { // S3D_video_format_length
2333         // the 0x7F mask ignores the reserved_bit value
2334         const uint8_t S3D_video_format_type = p[5] & 0x7F;
2335
2336         if (S3D_video_format_type == 0x03 ||
2337             S3D_video_format_type == 0x04 ||
2338             S3D_video_format_type == 0x08 ||
2339             S3D_video_format_type == 0x23) {
2340
2341             s1->has_stereo3d = 1;
2342
2343             switch (S3D_video_format_type) {
2344             case 0x03:
2345                 s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE;
2346                 break;
2347             case 0x04:
2348                 s1->stereo3d.type = AV_STEREO3D_TOPBOTTOM;
2349                 break;
2350             case 0x08:
2351                 s1->stereo3d.type = AV_STEREO3D_2D;
2352                 break;
2353             case 0x23:
2354                 s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE_QUINCUNX;
2355                 break;
2356             }
2357         }
2358     } else if (mpeg_decode_a53_cc(avctx, p, buf_size)) {
2359         return;
2360     }
2361 }
2362
2363 static void mpeg_decode_gop(AVCodecContext *avctx,
2364                             const uint8_t *buf, int buf_size)
2365 {
2366     Mpeg1Context *s1  = avctx->priv_data;
2367     MpegEncContext *s = &s1->mpeg_enc_ctx;
2368     int broken_link;
2369     int64_t tc;
2370
2371     init_get_bits(&s->gb, buf, buf_size * 8);
2372
2373     tc = avctx->timecode_frame_start = get_bits(&s->gb, 25);
2374
2375     s->closed_gop = get_bits1(&s->gb);
2376     /* broken_link indicate that after editing the
2377      * reference frames of the first B-Frames after GOP I-Frame
2378      * are missing (open gop) */
2379     broken_link = get_bits1(&s->gb);
2380
2381     if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2382         char tcbuf[AV_TIMECODE_STR_SIZE];
2383         av_timecode_make_mpeg_tc_string(tcbuf, tc);
2384         av_log(s->avctx, AV_LOG_DEBUG,
2385                "GOP (%s) closed_gop=%d broken_link=%d\n",
2386                tcbuf, s->closed_gop, broken_link);
2387     }
2388 }
2389
2390 static int decode_chunks(AVCodecContext *avctx, AVFrame *picture,
2391                          int *got_output, const uint8_t *buf, int buf_size)
2392 {
2393     Mpeg1Context *s = avctx->priv_data;
2394     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2395     const uint8_t *buf_ptr = buf;
2396     const uint8_t *buf_end = buf + buf_size;
2397     int ret, input_size;
2398     int last_code = 0, skip_frame = 0;
2399     int picture_start_code_seen = 0;
2400
2401     for (;;) {
2402         /* find next start code */
2403         uint32_t start_code = -1;
2404         buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
2405         if (start_code > 0x1ff) {
2406             if (!skip_frame) {
2407                 if (HAVE_THREADS &&
2408                     (avctx->active_thread_type & FF_THREAD_SLICE) &&
2409                     !avctx->hwaccel) {
2410                     int i;
2411                     av_assert0(avctx->thread_count > 1);
2412
2413                     avctx->execute(avctx, slice_decode_thread,
2414                                    &s2->thread_context[0], NULL,
2415                                    s->slice_count, sizeof(void *));
2416                     for (i = 0; i < s->slice_count; i++)
2417                         s2->er.error_count += s2->thread_context[i]->er.error_count;
2418                 }
2419
2420                 if ((CONFIG_MPEG_VDPAU_DECODER || CONFIG_MPEG1_VDPAU_DECODER)
2421                     && uses_vdpau(avctx))
2422                     ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2423
2424                 ret = slice_end(avctx, picture);
2425                 if (ret < 0)
2426                     return ret;
2427                 else if (ret) {
2428                     // FIXME: merge with the stuff in mpeg_decode_slice
2429                     if (s2->last_picture_ptr || s2->low_delay)
2430                         *got_output = 1;
2431                 }
2432             }
2433             s2->pict_type = 0;
2434
2435             if (avctx->err_recognition & AV_EF_EXPLODE && s2->er.error_count)
2436                 return AVERROR_INVALIDDATA;
2437
2438             return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2439         }
2440
2441         input_size = buf_end - buf_ptr;
2442
2443         if (avctx->debug & FF_DEBUG_STARTCODE)
2444             av_log(avctx, AV_LOG_DEBUG, "%3"PRIX32" at %"PTRDIFF_SPECIFIER" left %d\n",
2445                    start_code, buf_ptr - buf, input_size);
2446
2447         /* prepare data for next start code */
2448         switch (start_code) {
2449         case SEQ_START_CODE:
2450             if (last_code == 0) {
2451                 mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2452                 if (buf != avctx->extradata)
2453                     s->sync = 1;
2454             } else {
2455                 av_log(avctx, AV_LOG_ERROR,
2456                        "ignoring SEQ_START_CODE after %X\n", last_code);
2457                 if (avctx->err_recognition & AV_EF_EXPLODE)
2458                     return AVERROR_INVALIDDATA;
2459             }
2460             break;
2461
2462         case PICTURE_START_CODE:
2463             if (picture_start_code_seen && s2->picture_structure == PICT_FRAME) {
2464                /* If it's a frame picture, there can't be more than one picture header.
2465                   Yet, it does happen and we need to handle it. */
2466                av_log(avctx, AV_LOG_WARNING, "ignoring extra picture following a frame-picture\n");
2467                break;
2468             }
2469             picture_start_code_seen = 1;
2470
2471             if (s2->width <= 0 || s2->height <= 0) {
2472                 av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
2473                        s2->width, s2->height);
2474                 return AVERROR_INVALIDDATA;
2475             }
2476
2477             if (s->tmpgexs){
2478                 s2->intra_dc_precision= 3;
2479                 s2->intra_matrix[0]= 1;
2480             }
2481             if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
2482                 !avctx->hwaccel && s->slice_count) {
2483                 int i;
2484
2485                 avctx->execute(avctx, slice_decode_thread,
2486                                s2->thread_context, NULL,
2487                                s->slice_count, sizeof(void *));
2488                 for (i = 0; i < s->slice_count; i++)
2489                     s2->er.error_count += s2->thread_context[i]->er.error_count;
2490                 s->slice_count = 0;
2491             }
2492             if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2493                 ret = mpeg_decode_postinit(avctx);
2494                 if (ret < 0) {
2495                     av_log(avctx, AV_LOG_ERROR,
2496                            "mpeg_decode_postinit() failure\n");
2497                     return ret;
2498                 }
2499
2500                 /* We have a complete image: we try to decompress it. */
2501                 if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2502                     s2->pict_type = 0;
2503                 s->first_slice = 1;
2504                 last_code      = PICTURE_START_CODE;
2505             } else {
2506                 av_log(avctx, AV_LOG_ERROR,
2507                        "ignoring pic after %X\n", last_code);
2508                 if (avctx->err_recognition & AV_EF_EXPLODE)
2509                     return AVERROR_INVALIDDATA;
2510             }
2511             break;
2512         case EXT_START_CODE:
2513             init_get_bits(&s2->gb, buf_ptr, input_size * 8);
2514
2515             switch (get_bits(&s2->gb, 4)) {
2516             case 0x1:
2517                 if (last_code == 0) {
2518                     mpeg_decode_sequence_extension(s);
2519                 } else {
2520                     av_log(avctx, AV_LOG_ERROR,
2521                            "ignoring seq ext after %X\n", last_code);
2522                     if (avctx->err_recognition & AV_EF_EXPLODE)
2523                         return AVERROR_INVALIDDATA;
2524                 }
2525                 break;
2526             case 0x2:
2527                 mpeg_decode_sequence_display_extension(s);
2528                 break;
2529             case 0x3:
2530                 mpeg_decode_quant_matrix_extension(s2);
2531                 break;
2532             case 0x7:
2533                 mpeg_decode_picture_display_extension(s);
2534                 break;
2535             case 0x8:
2536                 if (last_code == PICTURE_START_CODE) {
2537                     mpeg_decode_picture_coding_extension(s);
2538                 } else {
2539                     av_log(avctx, AV_LOG_ERROR,
2540                            "ignoring pic cod ext after %X\n", last_code);
2541                     if (avctx->err_recognition & AV_EF_EXPLODE)
2542                         return AVERROR_INVALIDDATA;
2543                 }
2544                 break;
2545             }
2546             break;
2547         case USER_START_CODE:
2548             mpeg_decode_user_data(avctx, buf_ptr, input_size);
2549             break;
2550         case GOP_START_CODE:
2551             if (last_code == 0) {
2552                 s2->first_field = 0;
2553                 mpeg_decode_gop(avctx, buf_ptr, input_size);
2554                 s->sync = 1;
2555             } else {
2556                 av_log(avctx, AV_LOG_ERROR,
2557                        "ignoring GOP_START_CODE after %X\n", last_code);
2558                 if (avctx->err_recognition & AV_EF_EXPLODE)
2559                     return AVERROR_INVALIDDATA;
2560             }
2561             break;
2562         default:
2563             if (start_code >= SLICE_MIN_START_CODE &&
2564                 start_code <= SLICE_MAX_START_CODE && last_code == PICTURE_START_CODE) {
2565                 if (s2->progressive_sequence && !s2->progressive_frame) {
2566                     s2->progressive_frame = 1;
2567                     av_log(s2->avctx, AV_LOG_ERROR,
2568                            "interlaced frame in progressive sequence, ignoring\n");
2569                 }
2570
2571                 if (s2->picture_structure == 0 ||
2572                     (s2->progressive_frame && s2->picture_structure != PICT_FRAME)) {
2573                     av_log(s2->avctx, AV_LOG_ERROR,
2574                            "picture_structure %d invalid, ignoring\n",
2575                            s2->picture_structure);
2576                     s2->picture_structure = PICT_FRAME;
2577                 }
2578
2579                 if (s2->progressive_sequence && !s2->frame_pred_frame_dct)
2580                     av_log(s2->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
2581
2582                 if (s2->picture_structure == PICT_FRAME) {
2583                     s2->first_field = 0;
2584                     s2->v_edge_pos  = 16 * s2->mb_height;
2585                 } else {
2586                     s2->first_field ^= 1;
2587                     s2->v_edge_pos   = 8 * s2->mb_height;
2588                     memset(s2->mbskip_table, 0, s2->mb_stride * s2->mb_height);
2589                 }
2590             }
2591             if (start_code >= SLICE_MIN_START_CODE &&
2592                 start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2593                 const int field_pic = s2->picture_structure != PICT_FRAME;
2594                 int mb_y = start_code - SLICE_MIN_START_CODE;
2595                 last_code = SLICE_MIN_START_CODE;
2596                 if (s2->codec_id != AV_CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
2597                     mb_y += (*buf_ptr&0xE0)<<2;
2598
2599                 mb_y <<= field_pic;
2600                 if (s2->picture_structure == PICT_BOTTOM_FIELD)
2601                     mb_y++;
2602
2603                 if (buf_end - buf_ptr < 2) {
2604                     av_log(s2->avctx, AV_LOG_ERROR, "slice too small\n");
2605                     return AVERROR_INVALIDDATA;
2606                 }
2607
2608                 if (mb_y >= s2->mb_height) {
2609                     av_log(s2->avctx, AV_LOG_ERROR,
2610                            "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2611                     return -1;
2612                 }
2613
2614                 if (!s2->last_picture_ptr) {
2615                     /* Skip B-frames if we do not have reference frames and
2616                      * GOP is not closed. */
2617                     if (s2->pict_type == AV_PICTURE_TYPE_B) {
2618                         if (!s2->closed_gop) {
2619                             skip_frame = 1;
2620                             break;
2621                         }
2622                     }
2623                 }
2624                 if (s2->pict_type == AV_PICTURE_TYPE_I || (s2->flags2 & CODEC_FLAG2_SHOW_ALL))
2625                     s->sync = 1;
2626                 if (!s2->next_picture_ptr) {
2627                     /* Skip P-frames if we do not have a reference frame or
2628                      * we have an invalid header. */
2629                     if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
2630                         skip_frame = 1;
2631                         break;
2632                     }
2633                 }
2634                 if ((avctx->skip_frame >= AVDISCARD_NONREF &&
2635                      s2->pict_type == AV_PICTURE_TYPE_B) ||
2636                     (avctx->skip_frame >= AVDISCARD_NONKEY &&
2637                      s2->pict_type != AV_PICTURE_TYPE_I) ||
2638                     avctx->skip_frame >= AVDISCARD_ALL) {
2639                     skip_frame = 1;
2640                     break;
2641                 }
2642
2643                 if (!s->mpeg_enc_ctx_allocated)
2644                     break;
2645
2646                 if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2647                     if (mb_y < avctx->skip_top ||
2648                         mb_y >= s2->mb_height - avctx->skip_bottom)
2649                         break;
2650                 }
2651
2652                 if (!s2->pict_type) {
2653                     av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2654                     if (avctx->err_recognition & AV_EF_EXPLODE)
2655                         return AVERROR_INVALIDDATA;
2656                     break;
2657                 }
2658
2659                 if (s->first_slice) {
2660                     skip_frame     = 0;
2661                     s->first_slice = 0;
2662                     if (mpeg_field_start(s2, buf, buf_size) < 0)
2663                         return -1;
2664                 }
2665                 if (!s2->current_picture_ptr) {
2666                     av_log(avctx, AV_LOG_ERROR,
2667                            "current_picture not initialized\n");
2668                     return AVERROR_INVALIDDATA;
2669                 }
2670
2671                 if (uses_vdpau(avctx)) {
2672                     s->slice_count++;
2673                     break;
2674                 }
2675
2676                 if (HAVE_THREADS &&
2677                     (avctx->active_thread_type & FF_THREAD_SLICE) &&
2678                     !avctx->hwaccel) {
2679                     int threshold = (s2->mb_height * s->slice_count +
2680                                      s2->slice_context_count / 2) /
2681                                     s2->slice_context_count;
2682                     av_assert0(avctx->thread_count > 1);
2683                     if (threshold <= mb_y) {
2684                         MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2685
2686                         thread_context->start_mb_y = mb_y;
2687                         thread_context->end_mb_y   = s2->mb_height;
2688                         if (s->slice_count) {
2689                             s2->thread_context[s->slice_count - 1]->end_mb_y = mb_y;
2690                             ret = ff_update_duplicate_context(thread_context, s2);
2691                             if (ret < 0)
2692                                 return ret;
2693                         }
2694                         init_get_bits(&thread_context->gb, buf_ptr, input_size * 8);
2695                         s->slice_count++;
2696                     }
2697                     buf_ptr += 2; // FIXME add minimum number of bytes per slice
2698                 } else {
2699                     ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2700                     emms_c();
2701
2702                     if (ret < 0) {
2703                         if (avctx->err_recognition & AV_EF_EXPLODE)
2704                             return ret;
2705                         if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2706                             ff_er_add_slice(&s2->er, s2->resync_mb_x,
2707                                             s2->resync_mb_y, s2->mb_x, s2->mb_y,
2708                                             ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2709                     } else {
2710                         ff_er_add_slice(&s2->er, s2->resync_mb_x,
2711                                         s2->resync_mb_y, s2->mb_x - 1, s2->mb_y,
2712                                         ER_AC_END | ER_DC_END | ER_MV_END);
2713                     }
2714                 }
2715             }
2716             break;
2717         }
2718     }
2719 }
2720
2721 static int mpeg_decode_frame(AVCodecContext *avctx, void *data,
2722                              int *got_output, AVPacket *avpkt)
2723 {
2724     const uint8_t *buf = avpkt->data;
2725     int ret;
2726     int buf_size = avpkt->size;
2727     Mpeg1Context *s = avctx->priv_data;
2728     AVFrame *picture = data;
2729     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2730
2731     if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2732         /* special case for last picture */
2733         if (s2->low_delay == 0 && s2->next_picture_ptr) {
2734             int ret = av_frame_ref(picture, s2->next_picture_ptr->f);
2735             if (ret < 0)
2736                 return ret;
2737
2738             s2->next_picture_ptr = NULL;
2739
2740             *got_output = 1;
2741         }
2742         return buf_size;
2743     }
2744
2745     if (s2->flags & CODEC_FLAG_TRUNCATED) {
2746         int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf,
2747                                            buf_size, NULL);
2748
2749         if (ff_combine_frame(&s2->parse_context, next,
2750                              (const uint8_t **) &buf, &buf_size) < 0)
2751             return buf_size;
2752     }
2753
2754     s2->codec_tag = avpriv_toupper4(avctx->codec_tag);
2755     if (s->mpeg_enc_ctx_allocated == 0 && (   s2->codec_tag == AV_RL32("VCR2")
2756                                            || s2->codec_tag == AV_RL32("BW10")
2757                                           ))
2758         vcr2_init_sequence(avctx);
2759
2760     s->slice_count = 0;
2761
2762     if (avctx->extradata && !s->extradata_decoded) {
2763         ret = decode_chunks(avctx, picture, got_output,
2764                             avctx->extradata, avctx->extradata_size);
2765         if (*got_output) {
2766             av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
2767             *got_output = 0;
2768         }
2769         s->extradata_decoded = 1;
2770         if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) {
2771             s2->current_picture_ptr = NULL;
2772             return ret;
2773         }
2774     }
2775
2776     ret = decode_chunks(avctx, picture, got_output, buf, buf_size);
2777     if (ret<0 || *got_output)
2778         s2->current_picture_ptr = NULL;
2779
2780     return ret;
2781 }
2782
2783 static void flush(AVCodecContext *avctx)
2784 {
2785     Mpeg1Context *s = avctx->priv_data;
2786
2787     s->sync       = 0;
2788
2789     ff_mpeg_flush(avctx);
2790 }
2791
2792 static av_cold int mpeg_decode_end(AVCodecContext *avctx)
2793 {
2794     Mpeg1Context *s = avctx->priv_data;
2795
2796     if (s->mpeg_enc_ctx_allocated)
2797         ff_mpv_common_end(&s->mpeg_enc_ctx);
2798     av_freep(&s->a53_caption);
2799     return 0;
2800 }
2801
2802 static const AVProfile mpeg2_video_profiles[] = {
2803     { FF_PROFILE_MPEG2_422,          "4:2:2"              },
2804     { FF_PROFILE_MPEG2_HIGH,         "High"               },
2805     { FF_PROFILE_MPEG2_SS,           "Spatially Scalable" },
2806     { FF_PROFILE_MPEG2_SNR_SCALABLE, "SNR Scalable"       },
2807     { FF_PROFILE_MPEG2_MAIN,         "Main"               },
2808     { FF_PROFILE_MPEG2_SIMPLE,       "Simple"             },
2809     { FF_PROFILE_RESERVED,           "Reserved"           },
2810     { FF_PROFILE_RESERVED,           "Reserved"           },
2811     { FF_PROFILE_UNKNOWN                                  },
2812 };
2813
2814 AVCodec ff_mpeg1video_decoder = {
2815     .name                  = "mpeg1video",
2816     .long_name             = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2817     .type                  = AVMEDIA_TYPE_VIDEO,
2818     .id                    = AV_CODEC_ID_MPEG1VIDEO,
2819     .priv_data_size        = sizeof(Mpeg1Context),
2820     .init                  = mpeg_decode_init,
2821     .close                 = mpeg_decode_end,
2822     .decode                = mpeg_decode_frame,
2823     .capabilities          = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2824                              CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2825                              CODEC_CAP_SLICE_THREADS,
2826     .flush                 = flush,
2827     .max_lowres            = 3,
2828     .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context)
2829 };
2830
2831 AVCodec ff_mpeg2video_decoder = {
2832     .name           = "mpeg2video",
2833     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2834     .type           = AVMEDIA_TYPE_VIDEO,
2835     .id             = AV_CODEC_ID_MPEG2VIDEO,
2836     .priv_data_size = sizeof(Mpeg1Context),
2837     .init           = mpeg_decode_init,
2838     .close          = mpeg_decode_end,
2839     .decode         = mpeg_decode_frame,
2840     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2841                       CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2842                       CODEC_CAP_SLICE_THREADS,
2843     .flush          = flush,
2844     .max_lowres     = 3,
2845     .profiles       = NULL_IF_CONFIG_SMALL(mpeg2_video_profiles),
2846 };
2847
2848 //legacy decoder
2849 AVCodec ff_mpegvideo_decoder = {
2850     .name           = "mpegvideo",
2851     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2852     .type           = AVMEDIA_TYPE_VIDEO,
2853     .id             = AV_CODEC_ID_MPEG2VIDEO,
2854     .priv_data_size = sizeof(Mpeg1Context),
2855     .init           = mpeg_decode_init,
2856     .close          = mpeg_decode_end,
2857     .decode         = mpeg_decode_frame,
2858     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
2859     .flush          = flush,
2860     .max_lowres     = 3,
2861 };
2862
2863 #if FF_API_XVMC
2864 #if CONFIG_MPEG_XVMC_DECODER
2865 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx)
2866 {
2867     if (avctx->active_thread_type & FF_THREAD_SLICE)
2868         return -1;
2869     if (!(avctx->slice_flags & SLICE_FLAG_CODED_ORDER))
2870         return -1;
2871     if (!(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
2872         av_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2873     }
2874     mpeg_decode_init(avctx);
2875
2876     avctx->pix_fmt           = AV_PIX_FMT_XVMC_MPEG2_IDCT;
2877     avctx->xvmc_acceleration = 2; // 2 - the blocks are packed!
2878
2879     return 0;
2880 }
2881
2882 AVCodec ff_mpeg_xvmc_decoder = {
2883     .name           = "mpegvideo_xvmc",
2884     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2885     .type           = AVMEDIA_TYPE_VIDEO,
2886     .id             = AV_CODEC_ID_MPEG2VIDEO_XVMC,
2887     .priv_data_size = sizeof(Mpeg1Context),
2888     .init           = mpeg_mc_decode_init,
2889     .close          = mpeg_decode_end,
2890     .decode         = mpeg_decode_frame,
2891     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2892                       CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2893     .flush          = flush,
2894 };
2895
2896 #endif
2897 #endif /* FF_API_XVMC */
2898
2899 #if CONFIG_MPEG_VDPAU_DECODER
2900 AVCodec ff_mpeg_vdpau_decoder = {
2901     .name           = "mpegvideo_vdpau",
2902     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2903     .type           = AVMEDIA_TYPE_VIDEO,
2904     .id             = AV_CODEC_ID_MPEG2VIDEO,
2905     .priv_data_size = sizeof(Mpeg1Context),
2906     .init           = mpeg_decode_init,
2907     .close          = mpeg_decode_end,
2908     .decode         = mpeg_decode_frame,
2909     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2910                       CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2911     .flush          = flush,
2912 };
2913 #endif
2914
2915 #if CONFIG_MPEG1_VDPAU_DECODER
2916 AVCodec ff_mpeg1_vdpau_decoder = {
2917     .name           = "mpeg1video_vdpau",
2918     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
2919     .type           = AVMEDIA_TYPE_VIDEO,
2920     .id             = AV_CODEC_ID_MPEG1VIDEO,
2921     .priv_data_size = sizeof(Mpeg1Context),
2922     .init           = mpeg_decode_init,
2923     .close          = mpeg_decode_end,
2924     .decode         = mpeg_decode_frame,
2925     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2926                       CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2927     .flush          = flush,
2928 };
2929 #endif