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   1 /*
   2  * MPEG-1/2 decoder
   3  * Copyright (c) 2000, 2001 Fabrice Bellard
   4  * Copyright (c) 2002-2013 Michael Niedermayer <michaelni@gmx.at>
   5  *
   6  * This file is part of FFmpeg.
   7  *
   8  * FFmpeg is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * FFmpeg is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with FFmpeg; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 /**
  24  * @file
  25  * MPEG-1/2 decoder
  26  */
  27
  28 #define UNCHECKED_BITSTREAM_READER 1
  29 #include <inttypes.h>
  30
  31 #include "libavutil/attributes.h"
  32 #include "libavutil/imgutils.h"
  33 #include "libavutil/internal.h"
  34 #include "libavutil/stereo3d.h"
  35
  36 #include "avcodec.h"
  37 #include "bytestream.h"
  38 #include "error_resilience.h"
  39 #include "hwconfig.h"
  40 #include "idctdsp.h"
  41 #include "internal.h"
  42 #include "mpeg_er.h"
  43 #include "mpeg12.h"
  44 #include "mpeg12data.h"
  45 #include "mpegutils.h"
  46 #include "mpegvideo.h"
  47 #include "mpegvideodata.h"
  48 #include "profiles.h"
  49 #include "thread.h"
  50 #include "version.h"
  51 #include "xvmc_internal.h"
  52
  53 typedef struct Mpeg1Context {
  54     MpegEncContext mpeg_enc_ctx;
  55     int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
  56     int repeat_field;           /* true if we must repeat the field */
  57     AVPanScan pan_scan;         /* some temporary storage for the panscan */
  58     AVStereo3D stereo3d;
  59     int has_stereo3d;
  60     AVBufferRef *a53_buf_ref;
  61     uint8_t afd;
  62     int has_afd;
  63     int slice_count;
  64     AVRational save_aspect;
  65     int save_width, save_height, save_progressive_seq;
  66     int rc_buffer_size;
  67     AVRational frame_rate_ext;  /* MPEG-2 specific framerate modificator */
  68     int sync;                   /* Did we reach a sync point like a GOP/SEQ/KEYFrame? */
  69     int tmpgexs;
  70     int first_slice;
  71     int extradata_decoded;
  72 } Mpeg1Context;
  73
  74 #define MB_TYPE_ZERO_MV   0x20000000
  75
  76 static const uint32_t ptype2mb_type[7] = {
  77                     MB_TYPE_INTRA,
  78                     MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
  79                     MB_TYPE_L0,
  80                     MB_TYPE_L0 | MB_TYPE_CBP,
  81     MB_TYPE_QUANT | MB_TYPE_INTRA,
  82     MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
  83     MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
  84 };
  85
  86 static const uint32_t btype2mb_type[11] = {
  87                     MB_TYPE_INTRA,
  88                     MB_TYPE_L1,
  89                     MB_TYPE_L1   | MB_TYPE_CBP,
  90                     MB_TYPE_L0,
  91                     MB_TYPE_L0   | MB_TYPE_CBP,
  92                     MB_TYPE_L0L1,
  93                     MB_TYPE_L0L1 | MB_TYPE_CBP,
  94     MB_TYPE_QUANT | MB_TYPE_INTRA,
  95     MB_TYPE_QUANT | MB_TYPE_L1   | MB_TYPE_CBP,
  96     MB_TYPE_QUANT | MB_TYPE_L0   | MB_TYPE_CBP,
  97     MB_TYPE_QUANT | MB_TYPE_L0L1 | MB_TYPE_CBP,
  98 };
  99
 100 /* as H.263, but only 17 codes */
 101 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
 102 {
 103     int code, sign, val, shift;
 104
 105     code = get_vlc2(&s->gb, ff_mv_vlc.table, MV_VLC_BITS, 2);
 106     if (code == 0)
 107         return pred;
 108     if (code < 0)
 109         return 0xffff;
 110
 111     sign  = get_bits1(&s->gb);
 112     shift = fcode - 1;
 113     val   = code;
 114     if (shift) {
 115         val  = (val - 1) << shift;
 116         val |= get_bits(&s->gb, shift);
 117         val++;
 118     }
 119     if (sign)
 120         val = -val;
 121     val += pred;
 122
 123     /* modulo decoding */
 124     return sign_extend(val, 5 + shift);
 125 }
 126
 127 #define MAX_INDEX (64 - 1)
 128 #define check_scantable_index(ctx, x)                                         \
 129     do {                                                                      \
 130         if ((x) > MAX_INDEX) {                                                \
 131             av_log(ctx->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n",     \
 132                    ctx->mb_x, ctx->mb_y);                                     \
 133             return AVERROR_INVALIDDATA;                                       \
 134         }                                                                     \
 135     } while (0)
 136
 137 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
 138                                            int16_t *block, int n)
 139 {
 140     int level, i, j, run;
 141     RLTable *rl                  = &ff_rl_mpeg1;
 142     uint8_t *const scantable     = s->intra_scantable.permutated;
 143     const uint16_t *quant_matrix = s->inter_matrix;
 144     const int qscale             = s->qscale;
 145
 146     {
 147         OPEN_READER(re, &s->gb);
 148         i = -1;
 149         // special case for first coefficient, no need to add second VLC table
 150         UPDATE_CACHE(re, &s->gb);
 151         if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
 152             level = (3 * qscale * quant_matrix[0]) >> 5;
 153             level = (level - 1) | 1;
 154             if (GET_CACHE(re, &s->gb) & 0x40000000)
 155                 level = -level;
 156             block[0] = level;
 157             i++;
 158             SKIP_BITS(re, &s->gb, 2);
 159             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
 160                 goto end;
 161         }
 162         /* now quantify & encode AC coefficients */
 163         for (;;) {
 164             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
 165                        TEX_VLC_BITS, 2, 0);
 166
 167             if (level != 0) {
 168                 i += run;
 169                 if (i > MAX_INDEX)
 170                     break;
 171                 j = scantable[i];
 172                 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 173                 level = (level - 1) | 1;
 174                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
 175                         SHOW_SBITS(re, &s->gb, 1);
 176                 SKIP_BITS(re, &s->gb, 1);
 177             } else {
 178                 /* escape */
 179                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
 180                 LAST_SKIP_BITS(re, &s->gb, 6);
 181                 UPDATE_CACHE(re, &s->gb);
 182                 level = SHOW_SBITS(re, &s->gb, 8);
 183                 SKIP_BITS(re, &s->gb, 8);
 184                 if (level == -128) {
 185                     level = SHOW_UBITS(re, &s->gb, 8) - 256;
 186                     SKIP_BITS(re, &s->gb, 8);
 187                 } else if (level == 0) {
 188                     level = SHOW_UBITS(re, &s->gb, 8);
 189                     SKIP_BITS(re, &s->gb, 8);
 190                 }
 191                 i += run;
 192                 if (i > MAX_INDEX)
 193                     break;
 194                 j = scantable[i];
 195                 if (level < 0) {
 196                     level = -level;
 197                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 198                     level = (level - 1) | 1;
 199                     level = -level;
 200                 } else {
 201                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 202                     level = (level - 1) | 1;
 203                 }
 204             }
 205
 206             block[j] = level;
 207             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
 208                 break;
 209             UPDATE_CACHE(re, &s->gb);
 210         }
 211 end:
 212         LAST_SKIP_BITS(re, &s->gb, 2);
 213         CLOSE_READER(re, &s->gb);
 214     }
 215
 216     check_scantable_index(s, i);
 217
 218     s->block_last_index[n] = i;
 219     return 0;
 220 }
 221
 222 /**
 223  * Changing this would eat up any speed benefits it has.
 224  * Do not use "fast" flag if you need the code to be robust.
 225  */
 226 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s,
 227                                                 int16_t *block, int n)
 228 {
 229     int level, i, j, run;
 230     RLTable *rl              = &ff_rl_mpeg1;
 231     uint8_t *const scantable = s->intra_scantable.permutated;
 232     const int qscale         = s->qscale;
 233
 234     {
 235         OPEN_READER(re, &s->gb);
 236         i = -1;
 237         // Special case for first coefficient, no need to add second VLC table.
 238         UPDATE_CACHE(re, &s->gb);
 239         if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
 240             level = (3 * qscale) >> 1;
 241             level = (level - 1) | 1;
 242             if (GET_CACHE(re, &s->gb) & 0x40000000)
 243                 level = -level;
 244             block[0] = level;
 245             i++;
 246             SKIP_BITS(re, &s->gb, 2);
 247             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
 248                 goto end;
 249         }
 250
 251         /* now quantify & encode AC coefficients */
 252         for (;;) {
 253             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
 254                        TEX_VLC_BITS, 2, 0);
 255
 256             if (level != 0) {
 257                 i += run;
 258                 if (i > MAX_INDEX)
 259                     break;
 260                 j = scantable[i];
 261                 level = ((level * 2 + 1) * qscale) >> 1;
 262                 level = (level - 1) | 1;
 263                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
 264                         SHOW_SBITS(re, &s->gb, 1);
 265                 SKIP_BITS(re, &s->gb, 1);
 266             } else {
 267                 /* escape */
 268                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
 269                 LAST_SKIP_BITS(re, &s->gb, 6);
 270                 UPDATE_CACHE(re, &s->gb);
 271                 level = SHOW_SBITS(re, &s->gb, 8);
 272                 SKIP_BITS(re, &s->gb, 8);
 273                 if (level == -128) {
 274                     level = SHOW_UBITS(re, &s->gb, 8) - 256;
 275                     SKIP_BITS(re, &s->gb, 8);
 276                 } else if (level == 0) {
 277                     level = SHOW_UBITS(re, &s->gb, 8);
 278                     SKIP_BITS(re, &s->gb, 8);
 279                 }
 280                 i += run;
 281                 if (i > MAX_INDEX)
 282                     break;
 283                 j = scantable[i];
 284                 if (level < 0) {
 285                     level = -level;
 286                     level = ((level * 2 + 1) * qscale) >> 1;
 287                     level = (level - 1) | 1;
 288                     level = -level;
 289                 } else {
 290                     level = ((level * 2 + 1) * qscale) >> 1;
 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
 305     check_scantable_index(s, i);
 306
 307     s->block_last_index[n] = i;
 308     return 0;
 309 }
 310
 311 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
 312                                                int16_t *block, int n)
 313 {
 314     int level, i, j, run;
 315     RLTable *rl = &ff_rl_mpeg1;
 316     uint8_t *const scantable = s->intra_scantable.permutated;
 317     const uint16_t *quant_matrix;
 318     const int qscale = s->qscale;
 319     int mismatch;
 320
 321     mismatch = 1;
 322
 323     {
 324         OPEN_READER(re, &s->gb);
 325         i = -1;
 326         if (n < 4)
 327             quant_matrix = s->inter_matrix;
 328         else
 329             quant_matrix = s->chroma_inter_matrix;
 330
 331         // Special case for first coefficient, no need to add second VLC table.
 332         UPDATE_CACHE(re, &s->gb);
 333         if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
 334             level = (3 * qscale * quant_matrix[0]) >> 5;
 335             if (GET_CACHE(re, &s->gb) & 0x40000000)
 336                 level = -level;
 337             block[0]  = level;
 338             mismatch ^= level;
 339             i++;
 340             SKIP_BITS(re, &s->gb, 2);
 341             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
 342                 goto end;
 343         }
 344
 345         /* now quantify & encode AC coefficients */
 346         for (;;) {
 347             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
 348                        TEX_VLC_BITS, 2, 0);
 349
 350             if (level != 0) {
 351                 i += run;
 352                 if (i > MAX_INDEX)
 353                     break;
 354                 j = scantable[i];
 355                 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 356                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
 357                         SHOW_SBITS(re, &s->gb, 1);
 358                 SKIP_BITS(re, &s->gb, 1);
 359             } else {
 360                 /* escape */
 361                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
 362                 LAST_SKIP_BITS(re, &s->gb, 6);
 363                 UPDATE_CACHE(re, &s->gb);
 364                 level = SHOW_SBITS(re, &s->gb, 12);
 365                 SKIP_BITS(re, &s->gb, 12);
 366
 367                 i += run;
 368                 if (i > MAX_INDEX)
 369                     break;
 370                 j = scantable[i];
 371                 if (level < 0) {
 372                     level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 373                     level = -level;
 374                 } else {
 375                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 376                 }
 377             }
 378
 379             mismatch ^= level;
 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     block[63] ^= (mismatch & 1);
 390
 391     check_scantable_index(s, i);
 392
 393     s->block_last_index[n] = i;
 394     return 0;
 395 }
 396
 397 /**
 398  * Changing this would eat up any speed benefits it has.
 399  * Do not use "fast" flag if you need the code to be robust.
 400  */
 401 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
 402                                                     int16_t *block, int n)
 403 {
 404     int level, i, j, run;
 405     RLTable *rl              = &ff_rl_mpeg1;
 406     uint8_t *const scantable = s->intra_scantable.permutated;
 407     const int qscale         = s->qscale;
 408     OPEN_READER(re, &s->gb);
 409     i = -1;
 410
 411     // special case for first coefficient, no need to add second VLC table
 412     UPDATE_CACHE(re, &s->gb);
 413     if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
 414         level = (3 * qscale) >> 1;
 415         if (GET_CACHE(re, &s->gb) & 0x40000000)
 416             level = -level;
 417         block[0] = level;
 418         i++;
 419         SKIP_BITS(re, &s->gb, 2);
 420         if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
 421             goto end;
 422     }
 423
 424     /* now quantify & encode AC coefficients */
 425     for (;;) {
 426         GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
 427
 428         if (level != 0) {
 429             i += run;
 430             if (i > MAX_INDEX)
 431                 break;
 432             j = scantable[i];
 433             level = ((level * 2 + 1) * qscale) >> 1;
 434             level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
 435                     SHOW_SBITS(re, &s->gb, 1);
 436             SKIP_BITS(re, &s->gb, 1);
 437         } else {
 438             /* escape */
 439             run = SHOW_UBITS(re, &s->gb, 6) + 1;
 440             LAST_SKIP_BITS(re, &s->gb, 6);
 441             UPDATE_CACHE(re, &s->gb);
 442             level = SHOW_SBITS(re, &s->gb, 12);
 443             SKIP_BITS(re, &s->gb, 12);
 444
 445             i += run;
 446             if (i > MAX_INDEX)
 447                 break;
 448             j = scantable[i];
 449             if (level < 0) {
 450                 level = ((-level * 2 + 1) * qscale) >> 1;
 451                 level = -level;
 452             } else {
 453                 level = ((level * 2 + 1) * qscale) >> 1;
 454             }
 455         }
 456
 457         block[j] = level;
 458         if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF || i > 63)
 459             break;
 460
 461         UPDATE_CACHE(re, &s->gb);
 462     }
 463 end:
 464     LAST_SKIP_BITS(re, &s->gb, 2);
 465     CLOSE_READER(re, &s->gb);
 466
 467     check_scantable_index(s, i);
 468
 469     s->block_last_index[n] = i;
 470     return 0;
 471 }
 472
 473 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
 474                                            int16_t *block, int n)
 475 {
 476     int level, dc, diff, i, j, run;
 477     int component;
 478     RLTable *rl;
 479     uint8_t *const scantable = s->intra_scantable.permutated;
 480     const uint16_t *quant_matrix;
 481     const int qscale = s->qscale;
 482     int mismatch;
 483
 484     /* DC coefficient */
 485     if (n < 4) {
 486         quant_matrix = s->intra_matrix;
 487         component    = 0;
 488     } else {
 489         quant_matrix = s->chroma_intra_matrix;
 490         component    = (n & 1) + 1;
 491     }
 492     diff = decode_dc(&s->gb, component);
 493     if (diff >= 0xffff)
 494         return AVERROR_INVALIDDATA;
 495     dc  = s->last_dc[component];
 496     dc += diff;
 497     s->last_dc[component] = dc;
 498     block[0] = dc * (1 << (3 - s->intra_dc_precision));
 499     ff_tlog(s->avctx, "dc=%d\n", block[0]);
 500     mismatch = block[0] ^ 1;
 501     i = 0;
 502     if (s->intra_vlc_format)
 503         rl = &ff_rl_mpeg2;
 504     else
 505         rl = &ff_rl_mpeg1;
 506
 507     {
 508         OPEN_READER(re, &s->gb);
 509         /* now quantify & encode AC coefficients */
 510         for (;;) {
 511             UPDATE_CACHE(re, &s->gb);
 512             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
 513                        TEX_VLC_BITS, 2, 0);
 514
 515             if (level == 127) {
 516                 break;
 517             } else if (level != 0) {
 518                 i += run;
 519                 if (i > MAX_INDEX)
 520                     break;
 521                 j = scantable[i];
 522                 level = (level * qscale * quant_matrix[j]) >> 4;
 523                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
 524                         SHOW_SBITS(re, &s->gb, 1);
 525                 LAST_SKIP_BITS(re, &s->gb, 1);
 526             } else {
 527                 /* escape */
 528                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
 529                 LAST_SKIP_BITS(re, &s->gb, 6);
 530                 UPDATE_CACHE(re, &s->gb);
 531                 level = SHOW_SBITS(re, &s->gb, 12);
 532                 SKIP_BITS(re, &s->gb, 12);
 533                 i += run;
 534                 if (i > MAX_INDEX)
 535                     break;
 536                 j = scantable[i];
 537                 if (level < 0) {
 538                     level = (-level * qscale * quant_matrix[j]) >> 4;
 539                     level = -level;
 540                 } else {
 541                     level = (level * qscale * quant_matrix[j]) >> 4;
 542                 }
 543             }
 544
 545             mismatch ^= level;
 546             block[j]  = level;
 547         }
 548         CLOSE_READER(re, &s->gb);
 549     }
 550     block[63] ^= mismatch & 1;
 551
 552     check_scantable_index(s, i);
 553
 554     s->block_last_index[n] = i;
 555     return 0;
 556 }
 557
 558 /**
 559  * Changing this would eat up any speed benefits it has.
 560  * Do not use "fast" flag if you need the code to be robust.
 561  */
 562 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
 563                                                 int16_t *block, int n)
 564 {
 565     int level, dc, diff, i, j, run;
 566     int component;
 567     RLTable *rl;
 568     uint8_t *const scantable = s->intra_scantable.permutated;
 569     const uint16_t *quant_matrix;
 570     const int qscale = s->qscale;
 571
 572     /* DC coefficient */
 573     if (n < 4) {
 574         quant_matrix = s->intra_matrix;
 575         component    = 0;
 576     } else {
 577         quant_matrix = s->chroma_intra_matrix;
 578         component    = (n & 1) + 1;
 579     }
 580     diff = decode_dc(&s->gb, component);
 581     if (diff >= 0xffff)
 582         return AVERROR_INVALIDDATA;
 583     dc = s->last_dc[component];
 584     dc += diff;
 585     s->last_dc[component] = dc;
 586     block[0] = dc * (1 << (3 - s->intra_dc_precision));
 587     i = 0;
 588     if (s->intra_vlc_format)
 589         rl = &ff_rl_mpeg2;
 590     else
 591         rl = &ff_rl_mpeg1;
 592
 593     {
 594         OPEN_READER(re, &s->gb);
 595         /* now quantify & encode AC coefficients */
 596         for (;;) {
 597             UPDATE_CACHE(re, &s->gb);
 598             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
 599                        TEX_VLC_BITS, 2, 0);
 600
 601             if (level >= 64 || i > 63) {
 602                 break;
 603             } else if (level != 0) {
 604                 i += run;
 605                 j = scantable[i];
 606                 level = (level * qscale * quant_matrix[j]) >> 4;
 607                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
 608                         SHOW_SBITS(re, &s->gb, 1);
 609                 LAST_SKIP_BITS(re, &s->gb, 1);
 610             } else {
 611                 /* escape */
 612                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
 613                 LAST_SKIP_BITS(re, &s->gb, 6);
 614                 UPDATE_CACHE(re, &s->gb);
 615                 level = SHOW_SBITS(re, &s->gb, 12);
 616                 SKIP_BITS(re, &s->gb, 12);
 617                 i += run;
 618                 j = scantable[i];
 619                 if (level < 0) {
 620                     level = (-level * qscale * quant_matrix[j]) >> 4;
 621                     level = -level;
 622                 } else {
 623                     level = (level * qscale * quant_matrix[j]) >> 4;
 624                 }
 625             }
 626
 627             block[j] = level;
 628         }
 629         CLOSE_READER(re, &s->gb);
 630     }
 631
 632     check_scantable_index(s, i);
 633
 634     s->block_last_index[n] = i;
 635     return 0;
 636 }
 637
 638 /******************************************/
 639 /* decoding */
 640
 641 static inline int get_dmv(MpegEncContext *s)
 642 {
 643     if (get_bits1(&s->gb))
 644         return 1 - (get_bits1(&s->gb) << 1);
 645     else
 646         return 0;
 647 }
 648
 649 /* motion type (for MPEG-2) */
 650 #define MT_FIELD 1
 651 #define MT_FRAME 2
 652 #define MT_16X8  2
 653 #define MT_DMV   3
 654
 655 static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
 656 {
 657     int i, j, k, cbp, val, mb_type, motion_type;
 658     const int mb_block_count = 4 + (1 << s->chroma_format);
 659     int ret;
 660
 661     ff_tlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
 662
 663     av_assert2(s->mb_skipped == 0);
 664
 665     if (s->mb_skip_run-- != 0) {
 666         if (s->pict_type == AV_PICTURE_TYPE_P) {
 667             s->mb_skipped = 1;
 668             s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
 669                 MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
 670         } else {
 671             int mb_type;
 672
 673             if (s->mb_x)
 674                 mb_type = s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
 675             else
 676                 // FIXME not sure if this is allowed in MPEG at all
 677                 mb_type = s->current_picture.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1];
 678             if (IS_INTRA(mb_type)) {
 679                 av_log(s->avctx, AV_LOG_ERROR, "skip with previntra\n");
 680                 return AVERROR_INVALIDDATA;
 681             }
 682             s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
 683                 mb_type | MB_TYPE_SKIP;
 684
 685             if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
 686                 s->mb_skipped = 1;
 687         }
 688
 689         return 0;
 690     }
 691
 692     switch (s->pict_type) {
 693     default:
 694     case AV_PICTURE_TYPE_I:
 695         if (get_bits1(&s->gb) == 0) {
 696             if (get_bits1(&s->gb) == 0) {
 697                 av_log(s->avctx, AV_LOG_ERROR,
 698                        "Invalid mb type in I-frame at %d %d\n",
 699                        s->mb_x, s->mb_y);
 700                 return AVERROR_INVALIDDATA;
 701             }
 702             mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
 703         } else {
 704             mb_type = MB_TYPE_INTRA;
 705         }
 706         break;
 707     case AV_PICTURE_TYPE_P:
 708         mb_type = get_vlc2(&s->gb, ff_mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
 709         if (mb_type < 0) {
 710             av_log(s->avctx, AV_LOG_ERROR,
 711                    "Invalid mb type in P-frame at %d %d\n", s->mb_x, s->mb_y);
 712             return AVERROR_INVALIDDATA;
 713         }
 714         mb_type = ptype2mb_type[mb_type];
 715         break;
 716     case AV_PICTURE_TYPE_B:
 717         mb_type = get_vlc2(&s->gb, ff_mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
 718         if (mb_type < 0) {
 719             av_log(s->avctx, AV_LOG_ERROR,
 720                    "Invalid mb type in B-frame at %d %d\n", s->mb_x, s->mb_y);
 721             return AVERROR_INVALIDDATA;
 722         }
 723         mb_type = btype2mb_type[mb_type];
 724         break;
 725     }
 726     ff_tlog(s->avctx, "mb_type=%x\n", mb_type);
 727 //    motion_type = 0; /* avoid warning */
 728     if (IS_INTRA(mb_type)) {
 729         s->bdsp.clear_blocks(s->block[0]);
 730
 731         if (!s->chroma_y_shift)
 732             s->bdsp.clear_blocks(s->block[6]);
 733
 734         /* compute DCT type */
 735         // FIXME: add an interlaced_dct coded var?
 736         if (s->picture_structure == PICT_FRAME &&
 737             !s->frame_pred_frame_dct)
 738             s->interlaced_dct = get_bits1(&s->gb);
 739
 740         if (IS_QUANT(mb_type))
 741             s->qscale = mpeg_get_qscale(s);
 742
 743         if (s->concealment_motion_vectors) {
 744             /* just parse them */
 745             if (s->picture_structure != PICT_FRAME)
 746                 skip_bits1(&s->gb);  /* field select */
 747
 748             s->mv[0][0][0]      =
 749             s->last_mv[0][0][0] =
 750             s->last_mv[0][1][0] = mpeg_decode_motion(s, s->mpeg_f_code[0][0],
 751                                                      s->last_mv[0][0][0]);
 752             s->mv[0][0][1]      =
 753             s->last_mv[0][0][1] =
 754             s->last_mv[0][1][1] = mpeg_decode_motion(s, s->mpeg_f_code[0][1],
 755                                                      s->last_mv[0][0][1]);
 756
 757             check_marker(s->avctx, &s->gb, "after concealment_motion_vectors");
 758         } else {
 759             /* reset mv prediction */
 760             memset(s->last_mv, 0, sizeof(s->last_mv));
 761         }
 762         s->mb_intra = 1;
 763         // if 1, we memcpy blocks in xvmcvideo
 764         if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
 765             ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
 766
 767         if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
 768             if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
 769                 for (i = 0; i < 6; i++)
 770                     mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
 771             } else {
 772                 for (i = 0; i < mb_block_count; i++)
 773                     if ((ret = mpeg2_decode_block_intra(s, *s->pblocks[i], i)) < 0)
 774                         return ret;
 775             }
 776         } else {
 777             for (i = 0; i < 6; i++) {
 778                 ret = ff_mpeg1_decode_block_intra(&s->gb,
 779                                                   s->intra_matrix,
 780                                                   s->intra_scantable.permutated,
 781                                                   s->last_dc, *s->pblocks[i],
 782                                                   i, s->qscale);
 783                 if (ret < 0) {
 784                     av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n",
 785                            s->mb_x, s->mb_y);
 786                     return ret;
 787                 }
 788
 789                 s->block_last_index[i] = ret;
 790             }
 791         }
 792     } else {
 793         if (mb_type & MB_TYPE_ZERO_MV) {
 794             av_assert2(mb_type & MB_TYPE_CBP);
 795
 796             s->mv_dir = MV_DIR_FORWARD;
 797             if (s->picture_structure == PICT_FRAME) {
 798                 if (s->picture_structure == PICT_FRAME
 799                     && !s->frame_pred_frame_dct)
 800                     s->interlaced_dct = get_bits1(&s->gb);
 801                 s->mv_type = MV_TYPE_16X16;
 802             } else {
 803                 s->mv_type            = MV_TYPE_FIELD;
 804                 mb_type              |= MB_TYPE_INTERLACED;
 805                 s->field_select[0][0] = s->picture_structure - 1;
 806             }
 807
 808             if (IS_QUANT(mb_type))
 809                 s->qscale = mpeg_get_qscale(s);
 810
 811             s->last_mv[0][0][0] = 0;
 812             s->last_mv[0][0][1] = 0;
 813             s->last_mv[0][1][0] = 0;
 814             s->last_mv[0][1][1] = 0;
 815             s->mv[0][0][0]      = 0;
 816             s->mv[0][0][1]      = 0;
 817         } else {
 818             av_assert2(mb_type & MB_TYPE_L0L1);
 819             // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
 820             /* get additional motion vector type */
 821             if (s->picture_structure == PICT_FRAME && s->frame_pred_frame_dct) {
 822                 motion_type = MT_FRAME;
 823             } else {
 824                 motion_type = get_bits(&s->gb, 2);
 825                 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
 826                     s->interlaced_dct = get_bits1(&s->gb);
 827             }
 828
 829             if (IS_QUANT(mb_type))
 830                 s->qscale = mpeg_get_qscale(s);
 831
 832             /* motion vectors */
 833             s->mv_dir = (mb_type >> 13) & 3;
 834             ff_tlog(s->avctx, "motion_type=%d\n", motion_type);
 835             switch (motion_type) {
 836             case MT_FRAME: /* or MT_16X8 */
 837                 if (s->picture_structure == PICT_FRAME) {
 838                     mb_type   |= MB_TYPE_16x16;
 839                     s->mv_type = MV_TYPE_16X16;
 840                     for (i = 0; i < 2; i++) {
 841                         if (USES_LIST(mb_type, i)) {
 842                             /* MT_FRAME */
 843                             s->mv[i][0][0]      =
 844                             s->last_mv[i][0][0] =
 845                             s->last_mv[i][1][0] =
 846                                 mpeg_decode_motion(s, s->mpeg_f_code[i][0],
 847                                                    s->last_mv[i][0][0]);
 848                             s->mv[i][0][1]      =
 849                             s->last_mv[i][0][1] =
 850                             s->last_mv[i][1][1] =
 851                                 mpeg_decode_motion(s, s->mpeg_f_code[i][1],
 852                                                    s->last_mv[i][0][1]);
 853                             /* full_pel: only for MPEG-1 */
 854                             if (s->full_pel[i]) {
 855                                 s->mv[i][0][0] *= 2;
 856                                 s->mv[i][0][1] *= 2;
 857                             }
 858                         }
 859                     }
 860                 } else {
 861                     mb_type   |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
 862                     s->mv_type = MV_TYPE_16X8;
 863                     for (i = 0; i < 2; i++) {
 864                         if (USES_LIST(mb_type, i)) {
 865                             /* MT_16X8 */
 866                             for (j = 0; j < 2; j++) {
 867                                 s->field_select[i][j] = get_bits1(&s->gb);
 868                                 for (k = 0; k < 2; k++) {
 869                                     val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
 870                                                              s->last_mv[i][j][k]);
 871                                     s->last_mv[i][j][k] = val;
 872                                     s->mv[i][j][k]      = val;
 873                                 }
 874                             }
 875                         }
 876                     }
 877                 }
 878                 break;
 879             case MT_FIELD:
 880                 s->mv_type = MV_TYPE_FIELD;
 881                 if (s->picture_structure == PICT_FRAME) {
 882                     mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
 883                     for (i = 0; i < 2; i++) {
 884                         if (USES_LIST(mb_type, i)) {
 885                             for (j = 0; j < 2; j++) {
 886                                 s->field_select[i][j] = get_bits1(&s->gb);
 887                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
 888                                                          s->last_mv[i][j][0]);
 889                                 s->last_mv[i][j][0] = val;
 890                                 s->mv[i][j][0]      = val;
 891                                 ff_tlog(s->avctx, "fmx=%d\n", val);
 892                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
 893                                                          s->last_mv[i][j][1] >> 1);
 894                                 s->last_mv[i][j][1] = 2 * val;
 895                                 s->mv[i][j][1]      = val;
 896                                 ff_tlog(s->avctx, "fmy=%d\n", val);
 897                             }
 898                         }
 899                     }
 900                 } else {
 901                     av_assert0(!s->progressive_sequence);
 902                     mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
 903                     for (i = 0; i < 2; i++) {
 904                         if (USES_LIST(mb_type, i)) {
 905                             s->field_select[i][0] = get_bits1(&s->gb);
 906                             for (k = 0; k < 2; k++) {
 907                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
 908                                                          s->last_mv[i][0][k]);
 909                                 s->last_mv[i][0][k] = val;
 910                                 s->last_mv[i][1][k] = val;
 911                                 s->mv[i][0][k]      = val;
 912                             }
 913                         }
 914                     }
 915                 }
 916                 break;
 917             case MT_DMV:
 918                 if (s->progressive_sequence){
 919                     av_log(s->avctx, AV_LOG_ERROR, "MT_DMV in progressive_sequence\n");
 920                     return AVERROR_INVALIDDATA;
 921                 }
 922                 s->mv_type = MV_TYPE_DMV;
 923                 for (i = 0; i < 2; i++) {
 924                     if (USES_LIST(mb_type, i)) {
 925                         int dmx, dmy, mx, my, m;
 926                         const int my_shift = s->picture_structure == PICT_FRAME;
 927
 928                         mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
 929                                                 s->last_mv[i][0][0]);
 930                         s->last_mv[i][0][0] = mx;
 931                         s->last_mv[i][1][0] = mx;
 932                         dmx = get_dmv(s);
 933                         my  = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
 934                                                  s->last_mv[i][0][1] >> my_shift);
 935                         dmy = get_dmv(s);
 936
 937
 938                         s->last_mv[i][0][1] = my * (1 << my_shift);
 939                         s->last_mv[i][1][1] = my * (1 << my_shift);
 940
 941                         s->mv[i][0][0] = mx;
 942                         s->mv[i][0][1] = my;
 943                         s->mv[i][1][0] = mx; // not used
 944                         s->mv[i][1][1] = my; // not used
 945
 946                         if (s->picture_structure == PICT_FRAME) {
 947                             mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
 948
 949                             // m = 1 + 2 * s->top_field_first;
 950                             m = s->top_field_first ? 1 : 3;
 951
 952                             /* top -> top pred */
 953                             s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
 954                             s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
 955                             m = 4 - m;
 956                             s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
 957                             s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
 958                         } else {
 959                             mb_type |= MB_TYPE_16x16;
 960
 961                             s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
 962                             s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
 963                             if (s->picture_structure == PICT_TOP_FIELD)
 964                                 s->mv[i][2][1]--;
 965                             else
 966                                 s->mv[i][2][1]++;
 967                         }
 968                     }
 969                 }
 970                 break;
 971             default:
 972                 av_log(s->avctx, AV_LOG_ERROR,
 973                        "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
 974                 return AVERROR_INVALIDDATA;
 975             }
 976         }
 977
 978         s->mb_intra = 0;
 979         if (HAS_CBP(mb_type)) {
 980             s->bdsp.clear_blocks(s->block[0]);
 981
 982             cbp = get_vlc2(&s->gb, ff_mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
 983             if (mb_block_count > 6) {
 984                 cbp *= 1 << mb_block_count - 6;
 985                 cbp  |= get_bits(&s->gb, mb_block_count - 6);
 986                 s->bdsp.clear_blocks(s->block[6]);
 987             }
 988             if (cbp <= 0) {
 989                 av_log(s->avctx, AV_LOG_ERROR,
 990                        "invalid cbp %d at %d %d\n", cbp, s->mb_x, s->mb_y);
 991                 return AVERROR_INVALIDDATA;
 992             }
 993
 994             // if 1, we memcpy blocks in xvmcvideo
 995             if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
 996                 ff_xvmc_pack_pblocks(s, cbp);
 997
 998             if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
 999                 if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
1000                     for (i = 0; i < 6; i++) {
1001                         if (cbp & 32)
1002                             mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
1003                         else
1004                             s->block_last_index[i] = -1;
1005                         cbp += cbp;
1006                     }
1007                 } else {
1008                     cbp <<= 12 - mb_block_count;
1009
1010                     for (i = 0; i < mb_block_count; i++) {
1011                         if (cbp & (1 << 11)) {
1012                             if ((ret = mpeg2_decode_block_non_intra(s, *s->pblocks[i], i)) < 0)
1013                                 return ret;
1014                         } else {
1015                             s->block_last_index[i] = -1;
1016                         }
1017                         cbp += cbp;
1018                     }
1019                 }
1020             } else {
1021                 if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
1022                     for (i = 0; i < 6; i++) {
1023                         if (cbp & 32)
1024                             mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1025                         else
1026                             s->block_last_index[i] = -1;
1027                         cbp += cbp;
1028                     }
1029                 } else {
1030                     for (i = 0; i < 6; i++) {
1031                         if (cbp & 32) {
1032                             if ((ret = mpeg1_decode_block_inter(s, *s->pblocks[i], i)) < 0)
1033                                 return ret;
1034                         } else {
1035                             s->block_last_index[i] = -1;
1036                         }
1037                         cbp += cbp;
1038                     }
1039                 }
1040             }
1041         } else {
1042             for (i = 0; i < 12; i++)
1043                 s->block_last_index[i] = -1;
1044         }
1045     }
1046
1047     s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1048
1049     return 0;
1050 }
1051
1052 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1053 {
1054     Mpeg1Context *s    = avctx->priv_data;
1055     MpegEncContext *s2 = &s->mpeg_enc_ctx;
1056
1057     ff_mpv_decode_defaults(s2);
1058
1059     if (   avctx->codec_tag != AV_RL32("VCR2")
1060         && avctx->codec_tag != AV_RL32("BW10"))
1061         avctx->coded_width = avctx->coded_height = 0; // do not trust dimensions from input
1062     ff_mpv_decode_init(s2, avctx);
1063
1064     s->mpeg_enc_ctx.avctx  = avctx;
1065
1066     /* we need some permutation to store matrices,
1067      * until the decoder sets the real permutation. */
1068     ff_mpv_idct_init(s2);
1069     ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1070     ff_mpeg12_init_vlcs();
1071
1072     s2->chroma_format              = 1;
1073     s->mpeg_enc_ctx_allocated      = 0;
1074     s->mpeg_enc_ctx.picture_number = 0;
1075     s->repeat_field                = 0;
1076     s->mpeg_enc_ctx.codec_id       = avctx->codec->id;
1077     avctx->color_range             = AVCOL_RANGE_MPEG;
1078     return 0;
1079 }
1080
1081 #if HAVE_THREADS
1082 static int mpeg_decode_update_thread_context(AVCodecContext *avctx,
1083                                              const AVCodecContext *avctx_from)
1084 {
1085     Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1086     MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1087     int err;
1088
1089     if (avctx == avctx_from               ||
1090         !ctx_from->mpeg_enc_ctx_allocated ||
1091         !s1->context_initialized)
1092         return 0;
1093
1094     err = ff_mpeg_update_thread_context(avctx, avctx_from);
1095     if (err)
1096         return err;
1097
1098     if (!ctx->mpeg_enc_ctx_allocated)
1099         memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1100
1101     if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1102         s->picture_number++;
1103
1104     return 0;
1105 }
1106 #endif
1107
1108 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1109                                  const uint8_t *new_perm)
1110 {
1111     uint16_t temp_matrix[64];
1112     int i;
1113
1114     memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1115
1116     for (i = 0; i < 64; i++)
1117         matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1118 }
1119
1120 static const enum AVPixelFormat mpeg1_hwaccel_pixfmt_list_420[] = {
1121 #if CONFIG_MPEG1_NVDEC_HWACCEL
1122     AV_PIX_FMT_CUDA,
1123 #endif
1124 #if CONFIG_MPEG1_XVMC_HWACCEL
1125     AV_PIX_FMT_XVMC,
1126 #endif
1127 #if CONFIG_MPEG1_VDPAU_HWACCEL
1128     AV_PIX_FMT_VDPAU,
1129 #endif
1130     AV_PIX_FMT_YUV420P,
1131     AV_PIX_FMT_NONE
1132 };
1133
1134 static const enum AVPixelFormat mpeg2_hwaccel_pixfmt_list_420[] = {
1135 #if CONFIG_MPEG2_NVDEC_HWACCEL
1136     AV_PIX_FMT_CUDA,
1137 #endif
1138 #if CONFIG_MPEG2_XVMC_HWACCEL
1139     AV_PIX_FMT_XVMC,
1140 #endif
1141 #if CONFIG_MPEG2_VDPAU_HWACCEL
1142     AV_PIX_FMT_VDPAU,
1143 #endif
1144 #if CONFIG_MPEG2_DXVA2_HWACCEL
1145     AV_PIX_FMT_DXVA2_VLD,
1146 #endif
1147 #if CONFIG_MPEG2_D3D11VA_HWACCEL
1148     AV_PIX_FMT_D3D11VA_VLD,
1149     AV_PIX_FMT_D3D11,
1150 #endif
1151 #if CONFIG_MPEG2_VAAPI_HWACCEL
1152     AV_PIX_FMT_VAAPI,
1153 #endif
1154 #if CONFIG_MPEG2_VIDEOTOOLBOX_HWACCEL
1155     AV_PIX_FMT_VIDEOTOOLBOX,
1156 #endif
1157     AV_PIX_FMT_YUV420P,
1158     AV_PIX_FMT_NONE
1159 };
1160
1161 static const enum AVPixelFormat mpeg12_pixfmt_list_422[] = {
1162     AV_PIX_FMT_YUV422P,
1163     AV_PIX_FMT_NONE
1164 };
1165
1166 static const enum AVPixelFormat mpeg12_pixfmt_list_444[] = {
1167     AV_PIX_FMT_YUV444P,
1168     AV_PIX_FMT_NONE
1169 };
1170
1171 static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
1172 {
1173     Mpeg1Context *s1  = avctx->priv_data;
1174     MpegEncContext *s = &s1->mpeg_enc_ctx;
1175     const enum AVPixelFormat *pix_fmts;
1176
1177     if (CONFIG_GRAY && (avctx->flags & AV_CODEC_FLAG_GRAY))
1178         return AV_PIX_FMT_GRAY8;
1179
1180     if (s->chroma_format < 2)
1181         pix_fmts = avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO ?
1182                                 mpeg1_hwaccel_pixfmt_list_420 :
1183                                 mpeg2_hwaccel_pixfmt_list_420;
1184     else if (s->chroma_format == 2)
1185         pix_fmts = mpeg12_pixfmt_list_422;
1186     else
1187         pix_fmts = mpeg12_pixfmt_list_444;
1188
1189     return ff_thread_get_format(avctx, pix_fmts);
1190 }
1191
1192 static void setup_hwaccel_for_pixfmt(AVCodecContext *avctx)
1193 {
1194     // until then pix_fmt may be changed right after codec init
1195     if (avctx->hwaccel)
1196         if (avctx->idct_algo == FF_IDCT_AUTO)
1197             avctx->idct_algo = FF_IDCT_NONE;
1198
1199     if (avctx->hwaccel && avctx->pix_fmt == AV_PIX_FMT_XVMC) {
1200         Mpeg1Context *s1 = avctx->priv_data;
1201         MpegEncContext *s = &s1->mpeg_enc_ctx;
1202
1203         s->pack_pblocks = 1;
1204     }
1205 }
1206
1207 /* Call this function when we know all parameters.
1208  * It may be called in different places for MPEG-1 and MPEG-2. */
1209 static int mpeg_decode_postinit(AVCodecContext *avctx)
1210 {
1211     Mpeg1Context *s1  = avctx->priv_data;
1212     MpegEncContext *s = &s1->mpeg_enc_ctx;
1213     uint8_t old_permutation[64];
1214     int ret;
1215
1216     if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1217         // MPEG-1 aspect
1218         AVRational aspect_inv = av_d2q(ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1219         avctx->sample_aspect_ratio = (AVRational) { aspect_inv.den, aspect_inv.num };
1220     } else { // MPEG-2
1221         // MPEG-2 aspect
1222         if (s->aspect_ratio_info > 1) {
1223             AVRational dar =
1224                 av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1225                                   (AVRational) { s1->pan_scan.width,
1226                                                  s1->pan_scan.height }),
1227                          (AVRational) { s->width, s->height });
1228
1229             /* We ignore the spec here and guess a bit as reality does not
1230              * match the spec, see for example res_change_ffmpeg_aspect.ts
1231              * and sequence-display-aspect.mpg.
1232              * issue1613, 621, 562 */
1233             if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1234                 (av_cmp_q(dar, (AVRational) { 4, 3 }) &&
1235                  av_cmp_q(dar, (AVRational) { 16, 9 }))) {
1236                 s->avctx->sample_aspect_ratio =
1237                     av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1238                              (AVRational) { s->width, s->height });
1239             } else {
1240                 s->avctx->sample_aspect_ratio =
1241                     av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1242                              (AVRational) { s1->pan_scan.width, s1->pan_scan.height });
1243 // issue1613 4/3 16/9 -> 16/9
1244 // res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1245 // widescreen-issue562.mpg 4/3 16/9 -> 16/9
1246 //                s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1247                 ff_dlog(avctx, "aspect A %d/%d\n",
1248                         ff_mpeg2_aspect[s->aspect_ratio_info].num,
1249                         ff_mpeg2_aspect[s->aspect_ratio_info].den);
1250                 ff_dlog(avctx, "aspect B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1251                         s->avctx->sample_aspect_ratio.den);
1252             }
1253         } else {
1254             s->avctx->sample_aspect_ratio =
1255                 ff_mpeg2_aspect[s->aspect_ratio_info];
1256         }
1257     } // MPEG-2
1258
1259     if (av_image_check_sar(s->width, s->height,
1260                            avctx->sample_aspect_ratio) < 0) {
1261         av_log(avctx, AV_LOG_WARNING, "ignoring invalid SAR: %u/%u\n",
1262                 avctx->sample_aspect_ratio.num,
1263                 avctx->sample_aspect_ratio.den);
1264         avctx->sample_aspect_ratio = (AVRational){ 0, 1 };
1265     }
1266
1267     if ((s1->mpeg_enc_ctx_allocated == 0)                   ||
1268         avctx->coded_width       != s->width                ||
1269         avctx->coded_height      != s->height               ||
1270         s1->save_width           != s->width                ||
1271         s1->save_height          != s->height               ||
1272         av_cmp_q(s1->save_aspect, s->avctx->sample_aspect_ratio) ||
1273         (s1->save_progressive_seq != s->progressive_sequence && FFALIGN(s->height, 16) != FFALIGN(s->height, 32)) ||
1274         0) {
1275         if (s1->mpeg_enc_ctx_allocated) {
1276             ParseContext pc = s->parse_context;
1277             s->parse_context.buffer = 0;
1278             ff_mpv_common_end(s);
1279             s->parse_context = pc;
1280             s1->mpeg_enc_ctx_allocated = 0;
1281         }
1282
1283         ret = ff_set_dimensions(avctx, s->width, s->height);
1284         if (ret < 0)
1285             return ret;
1286
1287         if (avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->bit_rate) {
1288             avctx->rc_max_rate = s->bit_rate;
1289         } else if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && s->bit_rate &&
1290                    (s->bit_rate != 0x3FFFF*400 || s->vbv_delay != 0xFFFF)) {
1291             avctx->bit_rate = s->bit_rate;
1292         }
1293         s1->save_aspect          = s->avctx->sample_aspect_ratio;
1294         s1->save_width           = s->width;
1295         s1->save_height          = s->height;
1296         s1->save_progressive_seq = s->progressive_sequence;
1297
1298         /* low_delay may be forced, in this case we will have B-frames
1299          * that behave like P-frames. */
1300         avctx->has_b_frames = !s->low_delay;
1301
1302         if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1303             // MPEG-1 fps
1304             avctx->framerate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
1305             avctx->ticks_per_frame     = 1;
1306
1307             avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1308         } else { // MPEG-2
1309             // MPEG-2 fps
1310             av_reduce(&s->avctx->framerate.num,
1311                       &s->avctx->framerate.den,
1312                       ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
1313                       ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1314                       1 << 30);
1315             avctx->ticks_per_frame = 2;
1316
1317             switch (s->chroma_format) {
1318             case 1: avctx->chroma_sample_location = AVCHROMA_LOC_LEFT; break;
1319             case 2:
1320             case 3: avctx->chroma_sample_location = AVCHROMA_LOC_TOPLEFT; break;
1321             default: av_assert0(0);
1322             }
1323         } // MPEG-2
1324
1325         avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1326         setup_hwaccel_for_pixfmt(avctx);
1327
1328         /* Quantization matrices may need reordering
1329          * if DCT permutation is changed. */
1330         memcpy(old_permutation, s->idsp.idct_permutation, 64 * sizeof(uint8_t));
1331
1332         ff_mpv_idct_init(s);
1333         if ((ret = ff_mpv_common_init(s)) < 0)
1334             return ret;
1335
1336         quant_matrix_rebuild(s->intra_matrix,        old_permutation, s->idsp.idct_permutation);
1337         quant_matrix_rebuild(s->inter_matrix,        old_permutation, s->idsp.idct_permutation);
1338         quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->idsp.idct_permutation);
1339         quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->idsp.idct_permutation);
1340
1341         s1->mpeg_enc_ctx_allocated = 1;
1342     }
1343     return 0;
1344 }
1345
1346 static int mpeg1_decode_picture(AVCodecContext *avctx, const uint8_t *buf,
1347                                 int buf_size)
1348 {
1349     Mpeg1Context *s1  = avctx->priv_data;
1350     MpegEncContext *s = &s1->mpeg_enc_ctx;
1351     int ref, f_code, vbv_delay;
1352
1353     init_get_bits(&s->gb, buf, buf_size * 8);
1354
1355     ref = get_bits(&s->gb, 10); /* temporal ref */
1356     s->pict_type = get_bits(&s->gb, 3);
1357     if (s->pict_type == 0 || s->pict_type > 3)
1358         return AVERROR_INVALIDDATA;
1359
1360     vbv_delay = get_bits(&s->gb, 16);
1361     s->vbv_delay = vbv_delay;
1362     if (s->pict_type == AV_PICTURE_TYPE_P ||
1363         s->pict_type == AV_PICTURE_TYPE_B) {
1364         s->full_pel[0] = get_bits1(&s->gb);
1365         f_code = get_bits(&s->gb, 3);
1366         if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1367             return AVERROR_INVALIDDATA;
1368         f_code += !f_code;
1369         s->mpeg_f_code[0][0] = f_code;
1370         s->mpeg_f_code[0][1] = f_code;
1371     }
1372     if (s->pict_type == AV_PICTURE_TYPE_B) {
1373         s->full_pel[1] = get_bits1(&s->gb);
1374         f_code = get_bits(&s->gb, 3);
1375         if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1376             return AVERROR_INVALIDDATA;
1377         f_code += !f_code;
1378         s->mpeg_f_code[1][0] = f_code;
1379         s->mpeg_f_code[1][1] = f_code;
1380     }
1381     s->current_picture.f->pict_type = s->pict_type;
1382     s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1383
1384     if (avctx->debug & FF_DEBUG_PICT_INFO)
1385         av_log(avctx, AV_LOG_DEBUG,
1386                "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1387
1388     s->y_dc_scale = 8;
1389     s->c_dc_scale = 8;
1390     return 0;
1391 }
1392
1393 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1394 {
1395     MpegEncContext *s = &s1->mpeg_enc_ctx;
1396     int horiz_size_ext, vert_size_ext;
1397     int bit_rate_ext;
1398     AVCPBProperties *cpb_props;
1399
1400     skip_bits(&s->gb, 1); /* profile and level esc*/
1401     s->avctx->profile       = get_bits(&s->gb, 3);
1402     s->avctx->level         = get_bits(&s->gb, 4);
1403     s->progressive_sequence = get_bits1(&s->gb);   /* progressive_sequence */
1404     s->chroma_format        = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1405
1406     if (!s->chroma_format) {
1407         s->chroma_format = 1;
1408         av_log(s->avctx, AV_LOG_WARNING, "Chroma format invalid\n");
1409     }
1410
1411     horiz_size_ext          = get_bits(&s->gb, 2);
1412     vert_size_ext           = get_bits(&s->gb, 2);
1413     s->width  |= (horiz_size_ext << 12);
1414     s->height |= (vert_size_ext  << 12);
1415     bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1416     s->bit_rate += (bit_rate_ext << 18) * 400LL;
1417     check_marker(s->avctx, &s->gb, "after bit rate extension");
1418     s1->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1419
1420     s->low_delay = get_bits1(&s->gb);
1421     if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
1422         s->low_delay = 1;
1423
1424     s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1425     s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1426
1427     ff_dlog(s->avctx, "sequence extension\n");
1428     s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1429
1430     if (cpb_props = ff_add_cpb_side_data(s->avctx)) {
1431         cpb_props->buffer_size = s1->rc_buffer_size;
1432         if (s->bit_rate != 0x3FFFF*400)
1433             cpb_props->max_bitrate = s->bit_rate;
1434     }
1435
1436     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1437         av_log(s->avctx, AV_LOG_DEBUG,
1438                "profile: %d, level: %d ps: %d cf:%d vbv buffer: %d, bitrate:%"PRId64"\n",
1439                s->avctx->profile, s->avctx->level, s->progressive_sequence, s->chroma_format,
1440                s1->rc_buffer_size, s->bit_rate);
1441 }
1442
1443 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1444 {
1445     MpegEncContext *s = &s1->mpeg_enc_ctx;
1446     int color_description, w, h;
1447
1448     skip_bits(&s->gb, 3); /* video format */
1449     color_description = get_bits1(&s->gb);
1450     if (color_description) {
1451         s->avctx->color_primaries = get_bits(&s->gb, 8);
1452         s->avctx->color_trc       = get_bits(&s->gb, 8);
1453         s->avctx->colorspace      = get_bits(&s->gb, 8);
1454     }
1455     w = get_bits(&s->gb, 14);
1456     skip_bits(&s->gb, 1); // marker
1457     h = get_bits(&s->gb, 14);
1458     // remaining 3 bits are zero padding
1459
1460     s1->pan_scan.width  = 16 * w;
1461     s1->pan_scan.height = 16 * h;
1462
1463     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1464         av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1465 }
1466
1467 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1468 {
1469     MpegEncContext *s = &s1->mpeg_enc_ctx;
1470     int i, nofco;
1471
1472     nofco = 1;
1473     if (s->progressive_sequence) {
1474         if (s->repeat_first_field) {
1475             nofco++;
1476             if (s->top_field_first)
1477                 nofco++;
1478         }
1479     } else {
1480         if (s->picture_structure == PICT_FRAME) {
1481             nofco++;
1482             if (s->repeat_first_field)
1483                 nofco++;
1484         }
1485     }
1486     for (i = 0; i < nofco; i++) {
1487         s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1488         skip_bits(&s->gb, 1); // marker
1489         s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1490         skip_bits(&s->gb, 1); // marker
1491     }
1492
1493     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1494         av_log(s->avctx, AV_LOG_DEBUG,
1495                "pde (%"PRId16",%"PRId16") (%"PRId16",%"PRId16") (%"PRId16",%"PRId16")\n",
1496                s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1497                s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1498                s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1499 }
1500
1501 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64],
1502                        uint16_t matrix1[64], int intra)
1503 {
1504     int i;
1505
1506     for (i = 0; i < 64; i++) {
1507         int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1508         int v = get_bits(&s->gb, 8);
1509         if (v == 0) {
1510             av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1511             return AVERROR_INVALIDDATA;
1512         }
1513         if (intra && i == 0 && v != 8) {
1514             av_log(s->avctx, AV_LOG_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v);
1515             v = 8; // needed by pink.mpg / issue1046
1516         }
1517         matrix0[j] = v;
1518         if (matrix1)
1519             matrix1[j] = v;
1520     }
1521     return 0;
1522 }
1523
1524 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1525 {
1526     ff_dlog(s->avctx, "matrix extension\n");
1527
1528     if (get_bits1(&s->gb))
1529         load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1530     if (get_bits1(&s->gb))
1531         load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1532     if (get_bits1(&s->gb))
1533         load_matrix(s, s->chroma_intra_matrix, NULL, 1);
1534     if (get_bits1(&s->gb))
1535         load_matrix(s, s->chroma_inter_matrix, NULL, 0);
1536 }
1537
1538 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1539 {
1540     MpegEncContext *s = &s1->mpeg_enc_ctx;
1541
1542     s->full_pel[0]       = s->full_pel[1] = 0;
1543     s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1544     s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1545     s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1546     s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1547     if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1548         av_log(s->avctx, AV_LOG_ERROR,
1549                "Missing picture start code, guessing missing values\n");
1550         if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1551             if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1552                 s->pict_type = AV_PICTURE_TYPE_I;
1553             else
1554                 s->pict_type = AV_PICTURE_TYPE_P;
1555         } else
1556             s->pict_type = AV_PICTURE_TYPE_B;
1557         s->current_picture.f->pict_type = s->pict_type;
1558         s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1559     }
1560     s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0];
1561     s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1];
1562     s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0];
1563     s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1];
1564
1565     s->intra_dc_precision         = get_bits(&s->gb, 2);
1566     s->picture_structure          = get_bits(&s->gb, 2);
1567     s->top_field_first            = get_bits1(&s->gb);
1568     s->frame_pred_frame_dct       = get_bits1(&s->gb);
1569     s->concealment_motion_vectors = get_bits1(&s->gb);
1570     s->q_scale_type               = get_bits1(&s->gb);
1571     s->intra_vlc_format           = get_bits1(&s->gb);
1572     s->alternate_scan             = get_bits1(&s->gb);
1573     s->repeat_first_field         = get_bits1(&s->gb);
1574     s->chroma_420_type            = get_bits1(&s->gb);
1575     s->progressive_frame          = get_bits1(&s->gb);
1576
1577     if (s->alternate_scan) {
1578         ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1579         ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1580     } else {
1581         ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1582         ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1583     }
1584
1585     /* composite display not parsed */
1586     ff_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1587     ff_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1588     ff_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1589     ff_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1590     ff_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1591     ff_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1592     ff_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1593     ff_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1594     ff_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1595 }
1596
1597 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1598 {
1599     AVCodecContext *avctx = s->avctx;
1600     Mpeg1Context *s1      = (Mpeg1Context *) s;
1601     int ret;
1602
1603     if (!(avctx->flags2 & AV_CODEC_FLAG2_CHUNKS)) {
1604         if (s->mb_width * s->mb_height * 11LL / (33 * 2 * 8) > buf_size)
1605             return AVERROR_INVALIDDATA;
1606     }
1607
1608     /* start frame decoding */
1609     if (s->first_field || s->picture_structure == PICT_FRAME) {
1610         AVFrameSideData *pan_scan;
1611
1612         if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
1613             return ret;
1614
1615         ff_mpeg_er_frame_start(s);
1616
1617         /* first check if we must repeat the frame */
1618         s->current_picture_ptr->f->repeat_pict = 0;
1619         if (s->repeat_first_field) {
1620             if (s->progressive_sequence) {
1621                 if (s->top_field_first)
1622                     s->current_picture_ptr->f->repeat_pict = 4;
1623                 else
1624                     s->current_picture_ptr->f->repeat_pict = 2;
1625             } else if (s->progressive_frame) {
1626                 s->current_picture_ptr->f->repeat_pict = 1;
1627             }
1628         }
1629
1630         pan_scan = av_frame_new_side_data(s->current_picture_ptr->f,
1631                                           AV_FRAME_DATA_PANSCAN,
1632                                           sizeof(s1->pan_scan));
1633         if (!pan_scan)
1634             return AVERROR(ENOMEM);
1635         memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
1636
1637         if (s1->a53_buf_ref) {
1638             AVFrameSideData *sd = av_frame_new_side_data_from_buf(
1639                 s->current_picture_ptr->f, AV_FRAME_DATA_A53_CC,
1640                 s1->a53_buf_ref);
1641             if (!sd)
1642                 av_buffer_unref(&s1->a53_buf_ref);
1643             s1->a53_buf_ref = NULL;
1644         }
1645
1646         if (s1->has_stereo3d) {
1647             AVStereo3D *stereo = av_stereo3d_create_side_data(s->current_picture_ptr->f);
1648             if (!stereo)
1649                 return AVERROR(ENOMEM);
1650
1651             *stereo = s1->stereo3d;
1652             s1->has_stereo3d = 0;
1653         }
1654
1655         if (s1->has_afd) {
1656             AVFrameSideData *sd =
1657                 av_frame_new_side_data(s->current_picture_ptr->f,
1658                                        AV_FRAME_DATA_AFD, 1);
1659             if (!sd)
1660                 return AVERROR(ENOMEM);
1661
1662             *sd->data   = s1->afd;
1663             s1->has_afd = 0;
1664         }
1665
1666         if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1667             ff_thread_finish_setup(avctx);
1668     } else { // second field
1669         int i;
1670
1671         if (!s->current_picture_ptr) {
1672             av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1673             return AVERROR_INVALIDDATA;
1674         }
1675
1676         if (s->avctx->hwaccel) {
1677             if ((ret = s->avctx->hwaccel->end_frame(s->avctx)) < 0) {
1678                 av_log(avctx, AV_LOG_ERROR,
1679                        "hardware accelerator failed to decode first field\n");
1680                 return ret;
1681             }
1682         }
1683
1684         for (i = 0; i < 4; i++) {
1685             s->current_picture.f->data[i] = s->current_picture_ptr->f->data[i];
1686             if (s->picture_structure == PICT_BOTTOM_FIELD)
1687                 s->current_picture.f->data[i] +=
1688                     s->current_picture_ptr->f->linesize[i];
1689         }
1690     }
1691
1692     if (avctx->hwaccel) {
1693         if ((ret = avctx->hwaccel->start_frame(avctx, buf, buf_size)) < 0)
1694             return ret;
1695     }
1696
1697     return 0;
1698 }
1699
1700 #define DECODE_SLICE_ERROR -1
1701 #define DECODE_SLICE_OK     0
1702
1703 /**
1704  * Decode a slice.
1705  * MpegEncContext.mb_y must be set to the MB row from the startcode.
1706  * @return DECODE_SLICE_ERROR if the slice is damaged,
1707  *         DECODE_SLICE_OK if this slice is OK
1708  */
1709 static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1710                              const uint8_t **buf, int buf_size)
1711 {
1712     AVCodecContext *avctx = s->avctx;
1713     const int lowres      = s->avctx->lowres;
1714     const int field_pic   = s->picture_structure != PICT_FRAME;
1715     int ret;
1716
1717     s->resync_mb_x =
1718     s->resync_mb_y = -1;
1719
1720     av_assert0(mb_y < s->mb_height);
1721
1722     init_get_bits(&s->gb, *buf, buf_size * 8);
1723     if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1724         skip_bits(&s->gb, 3);
1725
1726     ff_mpeg1_clean_buffers(s);
1727     s->interlaced_dct = 0;
1728
1729     s->qscale = mpeg_get_qscale(s);
1730
1731     if (s->qscale == 0) {
1732         av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1733         return AVERROR_INVALIDDATA;
1734     }
1735
1736     /* extra slice info */
1737     if (skip_1stop_8data_bits(&s->gb) < 0)
1738         return AVERROR_INVALIDDATA;
1739
1740     s->mb_x = 0;
1741
1742     if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1743         skip_bits1(&s->gb);
1744     } else {
1745         while (get_bits_left(&s->gb) > 0) {
1746             int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1747                                 MBINCR_VLC_BITS, 2);
1748             if (code < 0) {
1749                 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1750                 return AVERROR_INVALIDDATA;
1751             }
1752             if (code >= 33) {
1753                 if (code == 33)
1754                     s->mb_x += 33;
1755                 /* otherwise, stuffing, nothing to do */
1756             } else {
1757                 s->mb_x += code;
1758                 break;
1759             }
1760         }
1761     }
1762
1763     if (s->mb_x >= (unsigned) s->mb_width) {
1764         av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1765         return AVERROR_INVALIDDATA;
1766     }
1767
1768     if (avctx->hwaccel && avctx->hwaccel->decode_slice) {
1769         const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1770         int start_code = -1;
1771         buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1772         if (buf_end < *buf + buf_size)
1773             buf_end -= 4;
1774         s->mb_y = mb_y;
1775         if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1776             return DECODE_SLICE_ERROR;
1777         *buf = buf_end;
1778         return DECODE_SLICE_OK;
1779     }
1780
1781     s->resync_mb_x = s->mb_x;
1782     s->resync_mb_y = s->mb_y = mb_y;
1783     s->mb_skip_run = 0;
1784     ff_init_block_index(s);
1785
1786     if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1787         if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1788             av_log(s->avctx, AV_LOG_DEBUG,
1789                    "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",
1790                    s->qscale,
1791                    s->mpeg_f_code[0][0], s->mpeg_f_code[0][1],
1792                    s->mpeg_f_code[1][0], s->mpeg_f_code[1][1],
1793                    s->pict_type  == AV_PICTURE_TYPE_I ? "I" :
1794                    (s->pict_type == AV_PICTURE_TYPE_P ? "P" :
1795                    (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
1796                    s->progressive_sequence ? "ps"  : "",
1797                    s->progressive_frame    ? "pf"  : "",
1798                    s->alternate_scan       ? "alt" : "",
1799                    s->top_field_first      ? "top" : "",
1800                    s->intra_dc_precision, s->picture_structure,
1801                    s->frame_pred_frame_dct, s->concealment_motion_vectors,
1802                    s->q_scale_type, s->intra_vlc_format,
1803                    s->repeat_first_field, s->chroma_420_type ? "420" : "");
1804         }
1805     }
1806
1807     for (;;) {
1808         // If 1, we memcpy blocks in xvmcvideo.
1809         if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1810             ff_xvmc_init_block(s); // set s->block
1811
1812         if ((ret = mpeg_decode_mb(s, s->block)) < 0)
1813             return ret;
1814
1815         // Note motion_val is normally NULL unless we want to extract the MVs.
1816         if (s->current_picture.motion_val[0] && !s->encoding) {
1817             const int wrap = s->b8_stride;
1818             int xy         = s->mb_x * 2 + s->mb_y * 2 * wrap;
1819             int b8_xy      = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1820             int motion_x, motion_y, dir, i;
1821
1822             for (i = 0; i < 2; i++) {
1823                 for (dir = 0; dir < 2; dir++) {
1824                     if (s->mb_intra ||
1825                         (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1826                         motion_x = motion_y = 0;
1827                     } else if (s->mv_type == MV_TYPE_16X16 ||
1828                                (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1829                         motion_x = s->mv[dir][0][0];
1830                         motion_y = s->mv[dir][0][1];
1831                     } else { /* if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8)) */
1832                         motion_x = s->mv[dir][i][0];
1833                         motion_y = s->mv[dir][i][1];
1834                     }
1835
1836                     s->current_picture.motion_val[dir][xy][0]     = motion_x;
1837                     s->current_picture.motion_val[dir][xy][1]     = motion_y;
1838                     s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1839                     s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1840                     s->current_picture.ref_index [dir][b8_xy]     =
1841                     s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1842                     av_assert2(s->field_select[dir][i] == 0 ||
1843                                s->field_select[dir][i] == 1);
1844                 }
1845                 xy    += wrap;
1846                 b8_xy += 2;
1847             }
1848         }
1849
1850         s->dest[0] += 16 >> lowres;
1851         s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1852         s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1853
1854         ff_mpv_reconstruct_mb(s, s->block);
1855
1856         if (++s->mb_x >= s->mb_width) {
1857             const int mb_size = 16 >> s->avctx->lowres;
1858             int left;
1859
1860             ff_mpeg_draw_horiz_band(s, mb_size * (s->mb_y >> field_pic), mb_size);
1861             ff_mpv_report_decode_progress(s);
1862
1863             s->mb_x  = 0;
1864             s->mb_y += 1 << field_pic;
1865
1866             if (s->mb_y >= s->mb_height) {
1867                 int left   = get_bits_left(&s->gb);
1868                 int is_d10 = s->chroma_format == 2 &&
1869                              s->pict_type == AV_PICTURE_TYPE_I &&
1870                              avctx->profile == 0 && avctx->level == 5 &&
1871                              s->intra_dc_precision == 2 &&
1872                              s->q_scale_type == 1 && s->alternate_scan == 0 &&
1873                              s->progressive_frame == 0
1874                              /* vbv_delay == 0xBBB || 0xE10 */;
1875
1876                 if (left >= 32 && !is_d10) {
1877                     GetBitContext gb = s->gb;
1878                     align_get_bits(&gb);
1879                     if (show_bits(&gb, 24) == 0x060E2B) {
1880                         av_log(avctx, AV_LOG_DEBUG, "Invalid MXF data found in video stream\n");
1881                         is_d10 = 1;
1882                     }
1883                     if (left > 32 && show_bits_long(&gb, 32) == 0x201) {
1884                         av_log(avctx, AV_LOG_DEBUG, "skipping m704 alpha (unsupported)\n");
1885                         goto eos;
1886                     }
1887                 }
1888
1889                 if (left < 0 ||
1890                     (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10) ||
1891                     ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
1892                     av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X at %d %d\n",
1893                            left, left>0 ? show_bits(&s->gb, FFMIN(left, 23)) : 0, s->mb_x, s->mb_y);
1894                     return AVERROR_INVALIDDATA;
1895                 } else
1896                     goto eos;
1897             }
1898             // There are some files out there which are missing the last slice
1899             // in cases where the slice is completely outside the visible
1900             // area, we detect this here instead of running into the end expecting
1901             // more data
1902             left = get_bits_left(&s->gb);
1903             if (s->mb_y >= ((s->height + 15) >> 4) &&
1904                 !s->progressive_sequence &&
1905                 left <= 25 &&
1906                 left >= 0 &&
1907                 s->mb_skip_run == -1 &&
1908                 (!left || show_bits(&s->gb, left) == 0))
1909                 goto eos;
1910
1911             ff_init_block_index(s);
1912         }
1913
1914         /* skip mb handling */
1915         if (s->mb_skip_run == -1) {
1916             /* read increment again */
1917             s->mb_skip_run = 0;
1918             for (;;) {
1919                 int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1920                                     MBINCR_VLC_BITS, 2);
1921                 if (code < 0) {
1922                     av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1923                     return AVERROR_INVALIDDATA;
1924                 }
1925                 if (code >= 33) {
1926                     if (code == 33) {
1927                         s->mb_skip_run += 33;
1928                     } else if (code == 35) {
1929                         if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1930                             av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1931                             return AVERROR_INVALIDDATA;
1932                         }
1933                         goto eos; /* end of slice */
1934                     }
1935                     /* otherwise, stuffing, nothing to do */
1936                 } else {
1937                     s->mb_skip_run += code;
1938                     break;
1939                 }
1940             }
1941             if (s->mb_skip_run) {
1942                 int i;
1943                 if (s->pict_type == AV_PICTURE_TYPE_I) {
1944                     av_log(s->avctx, AV_LOG_ERROR,
1945                            "skipped MB in I-frame at %d %d\n", s->mb_x, s->mb_y);
1946                     return AVERROR_INVALIDDATA;
1947                 }
1948
1949                 /* skip mb */
1950                 s->mb_intra = 0;
1951                 for (i = 0; i < 12; i++)
1952                     s->block_last_index[i] = -1;
1953                 if (s->picture_structure == PICT_FRAME)
1954                     s->mv_type = MV_TYPE_16X16;
1955                 else
1956                     s->mv_type = MV_TYPE_FIELD;
1957                 if (s->pict_type == AV_PICTURE_TYPE_P) {
1958                     /* if P type, zero motion vector is implied */
1959                     s->mv_dir             = MV_DIR_FORWARD;
1960                     s->mv[0][0][0]        = s->mv[0][0][1]      = 0;
1961                     s->last_mv[0][0][0]   = s->last_mv[0][0][1] = 0;
1962                     s->last_mv[0][1][0]   = s->last_mv[0][1][1] = 0;
1963                     s->field_select[0][0] = (s->picture_structure - 1) & 1;
1964                 } else {
1965                     /* if B type, reuse previous vectors and directions */
1966                     s->mv[0][0][0] = s->last_mv[0][0][0];
1967                     s->mv[0][0][1] = s->last_mv[0][0][1];
1968                     s->mv[1][0][0] = s->last_mv[1][0][0];
1969                     s->mv[1][0][1] = s->last_mv[1][0][1];
1970                     s->field_select[0][0] = (s->picture_structure - 1) & 1;
1971                     s->field_select[1][0] = (s->picture_structure - 1) & 1;
1972                 }
1973             }
1974         }
1975     }
1976 eos: // end of slice
1977     if (get_bits_left(&s->gb) < 0) {
1978         av_log(s, AV_LOG_ERROR, "overread %d\n", -get_bits_left(&s->gb));
1979         return AVERROR_INVALIDDATA;
1980     }
1981     *buf += (get_bits_count(&s->gb) - 1) / 8;
1982     ff_dlog(s, "Slice start:%d %d  end:%d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1983     return 0;
1984 }
1985
1986 static int slice_decode_thread(AVCodecContext *c, void *arg)
1987 {
1988     MpegEncContext *s   = *(void **) arg;
1989     const uint8_t *buf  = s->gb.buffer;
1990     int mb_y            = s->start_mb_y;
1991     const int field_pic = s->picture_structure != PICT_FRAME;
1992
1993     s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
1994
1995     for (;;) {
1996         uint32_t start_code;
1997         int ret;
1998
1999         ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
2000         emms_c();
2001         ff_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
2002                 ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
2003                 s->start_mb_y, s->end_mb_y, s->er.error_count);
2004         if (ret < 0) {
2005             if (c->err_recognition & AV_EF_EXPLODE)
2006                 return ret;
2007             if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
2008                 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2009                                 s->mb_x, s->mb_y,
2010                                 ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2011         } else {
2012             ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2013                             s->mb_x - 1, s->mb_y,
2014                             ER_AC_END | ER_DC_END | ER_MV_END);
2015         }
2016
2017         if (s->mb_y == s->end_mb_y)
2018             return 0;
2019
2020         start_code = -1;
2021         buf        = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
2022         if (start_code < SLICE_MIN_START_CODE || start_code > SLICE_MAX_START_CODE)
2023             return AVERROR_INVALIDDATA;
2024         mb_y       = start_code - SLICE_MIN_START_CODE;
2025         if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
2026             mb_y += (*buf&0xE0)<<2;
2027         mb_y <<= field_pic;
2028         if (s->picture_structure == PICT_BOTTOM_FIELD)
2029             mb_y++;
2030         if (mb_y >= s->end_mb_y)
2031             return AVERROR_INVALIDDATA;
2032     }
2033 }
2034
2035 /**
2036  * Handle slice ends.
2037  * @return 1 if it seems to be the last slice
2038  */
2039 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2040 {
2041     Mpeg1Context *s1  = avctx->priv_data;
2042     MpegEncContext *s = &s1->mpeg_enc_ctx;
2043
2044     if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2045         return 0;
2046
2047     if (s->avctx->hwaccel) {
2048         int ret = s->avctx->hwaccel->end_frame(s->avctx);
2049         if (ret < 0) {
2050             av_log(avctx, AV_LOG_ERROR,
2051                    "hardware accelerator failed to decode picture\n");
2052             return ret;
2053         }
2054     }
2055
2056     /* end of slice reached */
2057     if (/* s->mb_y << field_pic == s->mb_height && */ !s->first_field && !s1->first_slice) {
2058         /* end of image */
2059
2060         ff_er_frame_end(&s->er);
2061
2062         ff_mpv_frame_end(s);
2063
2064         if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
2065             int ret = av_frame_ref(pict, s->current_picture_ptr->f);
2066             if (ret < 0)
2067                 return ret;
2068             ff_print_debug_info(s, s->current_picture_ptr, pict);
2069             ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2070         } else {
2071             if (avctx->active_thread_type & FF_THREAD_FRAME)
2072                 s->picture_number++;
2073             /* latency of 1 frame for I- and P-frames */
2074             /* XXX: use another variable than picture_number */
2075             if (s->last_picture_ptr) {
2076                 int ret = av_frame_ref(pict, s->last_picture_ptr->f);
2077                 if (ret < 0)
2078                     return ret;
2079                 ff_print_debug_info(s, s->last_picture_ptr, pict);
2080                 ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2081             }
2082         }
2083
2084         return 1;
2085     } else {
2086         return 0;
2087     }
2088 }
2089
2090 static int mpeg1_decode_sequence(AVCodecContext *avctx,
2091                                  const uint8_t *buf, int buf_size)
2092 {
2093     Mpeg1Context *s1  = avctx->priv_data;
2094     MpegEncContext *s = &s1->mpeg_enc_ctx;
2095     int width, height;
2096     int i, v, j;
2097
2098     init_get_bits(&s->gb, buf, buf_size * 8);
2099
2100     width  = get_bits(&s->gb, 12);
2101     height = get_bits(&s->gb, 12);
2102     if (width == 0 || height == 0) {
2103         av_log(avctx, AV_LOG_WARNING,
2104                "Invalid horizontal or vertical size value.\n");
2105         if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2106             return AVERROR_INVALIDDATA;
2107     }
2108     s->aspect_ratio_info = get_bits(&s->gb, 4);
2109     if (s->aspect_ratio_info == 0) {
2110         av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2111         if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2112             return AVERROR_INVALIDDATA;
2113     }
2114     s->frame_rate_index = get_bits(&s->gb, 4);
2115     if (s->frame_rate_index == 0 || s->frame_rate_index > 13) {
2116         av_log(avctx, AV_LOG_WARNING,
2117                "frame_rate_index %d is invalid\n", s->frame_rate_index);
2118         s->frame_rate_index = 1;
2119     }
2120     s->bit_rate = get_bits(&s->gb, 18) * 400LL;
2121     if (check_marker(s->avctx, &s->gb, "in sequence header") == 0) {
2122         return AVERROR_INVALIDDATA;
2123     }
2124
2125     s1->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2126     skip_bits(&s->gb, 1);
2127
2128     /* get matrix */
2129     if (get_bits1(&s->gb)) {
2130         load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2131     } else {
2132         for (i = 0; i < 64; i++) {
2133             j = s->idsp.idct_permutation[i];
2134             v = ff_mpeg1_default_intra_matrix[i];
2135             s->intra_matrix[j]        = v;
2136             s->chroma_intra_matrix[j] = v;
2137         }
2138     }
2139     if (get_bits1(&s->gb)) {
2140         load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2141     } else {
2142         for (i = 0; i < 64; i++) {
2143             int j = s->idsp.idct_permutation[i];
2144             v = ff_mpeg1_default_non_intra_matrix[i];
2145             s->inter_matrix[j]        = v;
2146             s->chroma_inter_matrix[j] = v;
2147         }
2148     }
2149
2150     if (show_bits(&s->gb, 23) != 0) {
2151         av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2152         return AVERROR_INVALIDDATA;
2153     }
2154
2155     s->width  = width;
2156     s->height = height;
2157
2158     /* We set MPEG-2 parameters so that it emulates MPEG-1. */
2159     s->progressive_sequence = 1;
2160     s->progressive_frame    = 1;
2161     s->picture_structure    = PICT_FRAME;
2162     s->first_field          = 0;
2163     s->frame_pred_frame_dct = 1;
2164     s->chroma_format        = 1;
2165     s->codec_id             =
2166     s->avctx->codec_id      = AV_CODEC_ID_MPEG1VIDEO;
2167     s->out_format           = FMT_MPEG1;
2168     s->swap_uv              = 0; // AFAIK VCR2 does not have SEQ_HEADER
2169     if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
2170         s->low_delay = 1;
2171
2172     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2173         av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%"PRId64", aspect_ratio_info: %d \n",
2174                s1->rc_buffer_size, s->bit_rate, s->aspect_ratio_info);
2175
2176     return 0;
2177 }
2178
2179 static int vcr2_init_sequence(AVCodecContext *avctx)
2180 {
2181     Mpeg1Context *s1  = avctx->priv_data;
2182     MpegEncContext *s = &s1->mpeg_enc_ctx;
2183     int i, v, ret;
2184
2185     /* start new MPEG-1 context decoding */
2186     s->out_format = FMT_MPEG1;
2187     if (s1->mpeg_enc_ctx_allocated) {
2188         ff_mpv_common_end(s);
2189         s1->mpeg_enc_ctx_allocated = 0;
2190     }
2191     s->width            = avctx->coded_width;
2192     s->height           = avctx->coded_height;
2193     avctx->has_b_frames = 0; // true?
2194     s->low_delay        = 1;
2195
2196     avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2197     setup_hwaccel_for_pixfmt(avctx);
2198
2199     ff_mpv_idct_init(s);
2200     if ((ret = ff_mpv_common_init(s)) < 0)
2201         return ret;
2202     s1->mpeg_enc_ctx_allocated = 1;
2203
2204     for (i = 0; i < 64; i++) {
2205         int j = s->idsp.idct_permutation[i];
2206         v = ff_mpeg1_default_intra_matrix[i];
2207         s->intra_matrix[j]        = v;
2208         s->chroma_intra_matrix[j] = v;
2209
2210         v = ff_mpeg1_default_non_intra_matrix[i];
2211         s->inter_matrix[j]        = v;
2212         s->chroma_inter_matrix[j] = v;
2213     }
2214
2215     s->progressive_sequence  = 1;
2216     s->progressive_frame     = 1;
2217     s->picture_structure     = PICT_FRAME;
2218     s->first_field           = 0;
2219     s->frame_pred_frame_dct  = 1;
2220     s->chroma_format         = 1;
2221     if (s->codec_tag == AV_RL32("BW10")) {
2222         s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2223     } else {
2224         s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
2225         s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
2226     }
2227     s1->save_width           = s->width;
2228     s1->save_height          = s->height;
2229     s1->save_progressive_seq = s->progressive_sequence;
2230     return 0;
2231 }
2232
2233 static int mpeg_decode_a53_cc(AVCodecContext *avctx,
2234                               const uint8_t *p, int buf_size)
2235 {
2236     Mpeg1Context *s1 = avctx->priv_data;
2237
2238     if (buf_size >= 6 &&
2239         p[0] == 'G' && p[1] == 'A' && p[2] == '9' && p[3] == '4' &&
2240         p[4] == 3 && (p[5] & 0x40)) {
2241         /* extract A53 Part 4 CC data */
2242         int cc_count = p[5] & 0x1f;
2243         if (cc_count > 0 && buf_size >= 7 + cc_count * 3) {
2244             int old_size = s1->a53_buf_ref ? s1->a53_buf_ref->size : 0;
2245             const uint64_t new_size = (old_size + cc_count
2246                                             * UINT64_C(3));
2247             int ret;
2248
2249             if (new_size > INT_MAX)
2250                 return AVERROR(EINVAL);
2251
2252             ret = av_buffer_realloc(&s1->a53_buf_ref, new_size);
2253             if (ret >= 0)
2254                 memcpy(s1->a53_buf_ref->data + old_size, p + 7, cc_count * UINT64_C(3));
2255
2256             avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
2257         }
2258         return 1;
2259     } else if (buf_size >= 2 &&
2260                p[0] == 0x03 && (p[1]&0x7f) == 0x01) {
2261         /* extract SCTE-20 CC data */
2262         GetBitContext gb;
2263         int cc_count = 0;
2264         int i, ret;
2265
2266         init_get_bits(&gb, p + 2, buf_size - 2);
2267         cc_count = get_bits(&gb, 5);
2268         if (cc_count > 0) {
2269             int old_size = s1->a53_buf_ref ? s1->a53_buf_ref->size : 0;
2270             const uint64_t new_size = (old_size + cc_count
2271                                             * UINT64_C(3));
2272             if (new_size > INT_MAX)
2273                 return AVERROR(EINVAL);
2274
2275             ret = av_buffer_realloc(&s1->a53_buf_ref, new_size);
2276             if (ret >= 0) {
2277                 uint8_t field, cc1, cc2;
2278                 uint8_t *cap = s1->a53_buf_ref->data;
2279
2280                 memset(s1->a53_buf_ref->data + old_size, 0, cc_count * 3);
2281                 for (i = 0; i < cc_count && get_bits_left(&gb) >= 26; i++) {
2282                     skip_bits(&gb, 2); // priority
2283                     field = get_bits(&gb, 2);
2284                     skip_bits(&gb, 5); // line_offset
2285                     cc1 = get_bits(&gb, 8);
2286                     cc2 = get_bits(&gb, 8);
2287                     skip_bits(&gb, 1); // marker
2288
2289                     if (!field) { // forbidden
2290                         cap[0] = cap[1] = cap[2] = 0x00;
2291                     } else {
2292                         field = (field == 2 ? 1 : 0);
2293                         if (!s1->mpeg_enc_ctx.top_field_first) field = !field;
2294                         cap[0] = 0x04 | field;
2295                         cap[1] = ff_reverse[cc1];
2296                         cap[2] = ff_reverse[cc2];
2297                     }
2298                     cap += 3;
2299                 }
2300             }
2301             avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
2302         }
2303         return 1;
2304     } else if (buf_size >= 11 &&
2305                p[0] == 'C' && p[1] == 'C' && p[2] == 0x01 && p[3] == 0xf8) {
2306         /* extract DVD CC data
2307          *
2308          * uint32_t   user_data_start_code        0x000001B2    (big endian)
2309          * uint16_t   user_identifier             0x4343 "CC"
2310          * uint8_t    user_data_type_code         0x01
2311          * uint8_t    caption_block_size          0xF8
2312          * uint8_t
2313          *   bit 7    caption_odd_field_first     1=odd field (CC1/CC2) first  0=even field (CC3/CC4) first
2314          *   bit 6    caption_filler              0
2315          *   bit 5:1  caption_block_count         number of caption blocks (pairs of caption words = frames). Most DVDs use 15 per start of GOP.
2316          *   bit 0    caption_extra_field_added   1=one additional caption word
2317          *
2318          * struct caption_field_block {
2319          *   uint8_t
2320          *     bit 7:1 caption_filler             0x7F (all 1s)
2321          *     bit 0   caption_field_odd          1=odd field (this is CC1/CC2)  0=even field (this is CC3/CC4)
2322          *   uint8_t   caption_first_byte
2323          *   uint8_t   caption_second_byte
2324          * } caption_block[(caption_block_count * 2) + caption_extra_field_added];
2325          *
2326          * Some DVDs encode caption data for both fields with caption_field_odd=1. The only way to decode the fields
2327          * correctly is to start on the field indicated by caption_odd_field_first and count between odd/even fields.
2328          * Don't assume that the first caption word is the odd field. There do exist MPEG files in the wild that start
2329          * on the even field. There also exist DVDs in the wild that encode an odd field count and the
2330          * caption_extra_field_added/caption_odd_field_first bits change per packet to allow that. */
2331         int cc_count = 0;
2332         int i, ret;
2333         // There is a caption count field in the data, but it is often
2334         // incorrect.  So count the number of captions present.
2335         for (i = 5; i + 6 <= buf_size && ((p[i] & 0xfe) == 0xfe); i += 6)
2336             cc_count++;
2337         // Transform the DVD format into A53 Part 4 format
2338         if (cc_count > 0) {
2339             int old_size = s1->a53_buf_ref ? s1->a53_buf_ref->size : 0;
2340             const uint64_t new_size = (old_size + cc_count
2341                                             * UINT64_C(6));
2342             if (new_size > INT_MAX)
2343                 return AVERROR(EINVAL);
2344
2345             ret = av_buffer_realloc(&s1->a53_buf_ref, new_size);
2346             if (ret >= 0) {
2347                 uint8_t field1 = !!(p[4] & 0x80);
2348                 uint8_t *cap = s1->a53_buf_ref->data;
2349                 p += 5;
2350                 for (i = 0; i < cc_count; i++) {
2351                     cap[0] = (p[0] == 0xff && field1) ? 0xfc : 0xfd;
2352                     cap[1] = p[1];
2353                     cap[2] = p[2];
2354                     cap[3] = (p[3] == 0xff && !field1) ? 0xfc : 0xfd;
2355                     cap[4] = p[4];
2356                     cap[5] = p[5];
2357                     cap += 6;
2358                     p += 6;
2359                 }
2360             }
2361             avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
2362         }
2363         return 1;
2364     }
2365     return 0;
2366 }
2367
2368 static void mpeg_decode_user_data(AVCodecContext *avctx,
2369                                   const uint8_t *p, int buf_size)
2370 {
2371     Mpeg1Context *s = avctx->priv_data;
2372     const uint8_t *buf_end = p + buf_size;
2373     Mpeg1Context *s1 = avctx->priv_data;
2374
2375 #if 0
2376     int i;
2377     for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i<buf_size; i++){
2378         av_log(avctx, AV_LOG_ERROR, "%c", p[i]);
2379     }
2380     av_log(avctx, AV_LOG_ERROR, "\n");
2381 #endif
2382
2383     if (buf_size > 29){
2384         int i;
2385         for(i=0; i<20; i++)
2386             if (!memcmp(p+i, "\0TMPGEXS\0", 9)){
2387                 s->tmpgexs= 1;
2388             }
2389     }
2390     /* we parse the DTG active format information */
2391     if (buf_end - p >= 5 &&
2392         p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2393         int flags = p[4];
2394         p += 5;
2395         if (flags & 0x80) {
2396             /* skip event id */
2397             p += 2;
2398         }
2399         if (flags & 0x40) {
2400             if (buf_end - p < 1)
2401                 return;
2402             s1->has_afd = 1;
2403             s1->afd     = p[0] & 0x0f;
2404         }
2405     } else if (buf_end - p >= 6 &&
2406                p[0] == 'J' && p[1] == 'P' && p[2] == '3' && p[3] == 'D' &&
2407                p[4] == 0x03) { // S3D_video_format_length
2408         // the 0x7F mask ignores the reserved_bit value
2409         const uint8_t S3D_video_format_type = p[5] & 0x7F;
2410
2411         if (S3D_video_format_type == 0x03 ||
2412             S3D_video_format_type == 0x04 ||
2413             S3D_video_format_type == 0x08 ||
2414             S3D_video_format_type == 0x23) {
2415
2416             s1->has_stereo3d = 1;
2417
2418             switch (S3D_video_format_type) {
2419             case 0x03:
2420                 s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE;
2421                 break;
2422             case 0x04:
2423                 s1->stereo3d.type = AV_STEREO3D_TOPBOTTOM;
2424                 break;
2425             case 0x08:
2426                 s1->stereo3d.type = AV_STEREO3D_2D;
2427                 break;
2428             case 0x23:
2429                 s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE_QUINCUNX;
2430                 break;
2431             }
2432         }
2433     } else if (mpeg_decode_a53_cc(avctx, p, buf_size)) {
2434         return;
2435     }
2436 }
2437
2438 static void mpeg_decode_gop(AVCodecContext *avctx,
2439                             const uint8_t *buf, int buf_size)
2440 {
2441     Mpeg1Context *s1  = avctx->priv_data;
2442     MpegEncContext *s = &s1->mpeg_enc_ctx;
2443     int broken_link;
2444     int64_t tc;
2445
2446     init_get_bits(&s->gb, buf, buf_size * 8);
2447
2448     tc = s-> timecode_frame_start = get_bits(&s->gb, 25);
2449
2450 #if FF_API_PRIVATE_OPT
2451 FF_DISABLE_DEPRECATION_WARNINGS
2452     avctx->timecode_frame_start = tc;
2453 FF_ENABLE_DEPRECATION_WARNINGS
2454 #endif
2455
2456     s->closed_gop = get_bits1(&s->gb);
2457     /* broken_link indicates that after editing the
2458      * reference frames of the first B-Frames after GOP I-Frame
2459      * are missing (open gop) */
2460     broken_link = get_bits1(&s->gb);
2461
2462     if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2463         char tcbuf[AV_TIMECODE_STR_SIZE];
2464         av_timecode_make_mpeg_tc_string(tcbuf, tc);
2465         av_log(s->avctx, AV_LOG_DEBUG,
2466                "GOP (%s) closed_gop=%d broken_link=%d\n",
2467                tcbuf, s->closed_gop, broken_link);
2468     }
2469 }
2470
2471 static int decode_chunks(AVCodecContext *avctx, AVFrame *picture,
2472                          int *got_output, const uint8_t *buf, int buf_size)
2473 {
2474     Mpeg1Context *s = avctx->priv_data;
2475     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2476     const uint8_t *buf_ptr = buf;
2477     const uint8_t *buf_end = buf + buf_size;
2478     int ret, input_size;
2479     int last_code = 0, skip_frame = 0;
2480     int picture_start_code_seen = 0;
2481
2482     for (;;) {
2483         /* find next start code */
2484         uint32_t start_code = -1;
2485         buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
2486         if (start_code > 0x1ff) {
2487             if (!skip_frame) {
2488                 if (HAVE_THREADS &&
2489                     (avctx->active_thread_type & FF_THREAD_SLICE) &&
2490                     !avctx->hwaccel) {
2491                     int i;
2492                     av_assert0(avctx->thread_count > 1);
2493
2494                     avctx->execute(avctx, slice_decode_thread,
2495                                    &s2->thread_context[0], NULL,
2496                                    s->slice_count, sizeof(void *));
2497                     for (i = 0; i < s->slice_count; i++)
2498                         s2->er.error_count += s2->thread_context[i]->er.error_count;
2499                 }
2500
2501                 ret = slice_end(avctx, picture);
2502                 if (ret < 0)
2503                     return ret;
2504                 else if (ret) {
2505                     // FIXME: merge with the stuff in mpeg_decode_slice
2506                     if (s2->last_picture_ptr || s2->low_delay || s2->pict_type == AV_PICTURE_TYPE_B)
2507                         *got_output = 1;
2508                 }
2509             }
2510             s2->pict_type = 0;
2511
2512             if (avctx->err_recognition & AV_EF_EXPLODE && s2->er.error_count)
2513                 return AVERROR_INVALIDDATA;
2514
2515             return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2516         }
2517
2518         input_size = buf_end - buf_ptr;
2519
2520         if (avctx->debug & FF_DEBUG_STARTCODE)
2521             av_log(avctx, AV_LOG_DEBUG, "%3"PRIX32" at %"PTRDIFF_SPECIFIER" left %d\n",
2522                    start_code, buf_ptr - buf, input_size);
2523
2524         /* prepare data for next start code */
2525         switch (start_code) {
2526         case SEQ_START_CODE:
2527             if (last_code == 0) {
2528                 mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2529                 if (buf != avctx->extradata)
2530                     s->sync = 1;
2531             } else {
2532                 av_log(avctx, AV_LOG_ERROR,
2533                        "ignoring SEQ_START_CODE after %X\n", last_code);
2534                 if (avctx->err_recognition & AV_EF_EXPLODE)
2535                     return AVERROR_INVALIDDATA;
2536             }
2537             break;
2538
2539         case PICTURE_START_CODE:
2540             if (picture_start_code_seen && s2->picture_structure == PICT_FRAME) {
2541                /* If it's a frame picture, there can't be more than one picture header.
2542                   Yet, it does happen and we need to handle it. */
2543                av_log(avctx, AV_LOG_WARNING, "ignoring extra picture following a frame-picture\n");
2544                break;
2545             }
2546             picture_start_code_seen = 1;
2547
2548             if (s2->width <= 0 || s2->height <= 0) {
2549                 av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
2550                        s2->width, s2->height);
2551                 return AVERROR_INVALIDDATA;
2552             }
2553
2554             if (s->tmpgexs){
2555                 s2->intra_dc_precision= 3;
2556                 s2->intra_matrix[0]= 1;
2557             }
2558             if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
2559                 !avctx->hwaccel && s->slice_count) {
2560                 int i;
2561
2562                 avctx->execute(avctx, slice_decode_thread,
2563                                s2->thread_context, NULL,
2564                                s->slice_count, sizeof(void *));
2565                 for (i = 0; i < s->slice_count; i++)
2566                     s2->er.error_count += s2->thread_context[i]->er.error_count;
2567                 s->slice_count = 0;
2568             }
2569             if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2570                 ret = mpeg_decode_postinit(avctx);
2571                 if (ret < 0) {
2572                     av_log(avctx, AV_LOG_ERROR,
2573                            "mpeg_decode_postinit() failure\n");
2574                     return ret;
2575                 }
2576
2577                 /* We have a complete image: we try to decompress it. */
2578                 if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2579                     s2->pict_type = 0;
2580                 s->first_slice = 1;
2581                 last_code      = PICTURE_START_CODE;
2582             } else {
2583                 av_log(avctx, AV_LOG_ERROR,
2584                        "ignoring pic after %X\n", last_code);
2585                 if (avctx->err_recognition & AV_EF_EXPLODE)
2586                     return AVERROR_INVALIDDATA;
2587             }
2588             break;
2589         case EXT_START_CODE:
2590             init_get_bits(&s2->gb, buf_ptr, input_size * 8);
2591
2592             switch (get_bits(&s2->gb, 4)) {
2593             case 0x1:
2594                 if (last_code == 0) {
2595                     mpeg_decode_sequence_extension(s);
2596                 } else {
2597                     av_log(avctx, AV_LOG_ERROR,
2598                            "ignoring seq ext after %X\n", last_code);
2599                     if (avctx->err_recognition & AV_EF_EXPLODE)
2600                         return AVERROR_INVALIDDATA;
2601                 }
2602                 break;
2603             case 0x2:
2604                 mpeg_decode_sequence_display_extension(s);
2605                 break;
2606             case 0x3:
2607                 mpeg_decode_quant_matrix_extension(s2);
2608                 break;
2609             case 0x7:
2610                 mpeg_decode_picture_display_extension(s);
2611                 break;
2612             case 0x8:
2613                 if (last_code == PICTURE_START_CODE) {
2614                     mpeg_decode_picture_coding_extension(s);
2615                 } else {
2616                     av_log(avctx, AV_LOG_ERROR,
2617                            "ignoring pic cod ext after %X\n", last_code);
2618                     if (avctx->err_recognition & AV_EF_EXPLODE)
2619                         return AVERROR_INVALIDDATA;
2620                 }
2621                 break;
2622             }
2623             break;
2624         case USER_START_CODE:
2625             mpeg_decode_user_data(avctx, buf_ptr, input_size);
2626             break;
2627         case GOP_START_CODE:
2628             if (last_code == 0) {
2629                 s2->first_field = 0;
2630                 mpeg_decode_gop(avctx, buf_ptr, input_size);
2631                 s->sync = 1;
2632             } else {
2633                 av_log(avctx, AV_LOG_ERROR,
2634                        "ignoring GOP_START_CODE after %X\n", last_code);
2635                 if (avctx->err_recognition & AV_EF_EXPLODE)
2636                     return AVERROR_INVALIDDATA;
2637             }
2638             break;
2639         default:
2640             if (start_code >= SLICE_MIN_START_CODE &&
2641                 start_code <= SLICE_MAX_START_CODE && last_code == PICTURE_START_CODE) {
2642                 if (s2->progressive_sequence && !s2->progressive_frame) {
2643                     s2->progressive_frame = 1;
2644                     av_log(s2->avctx, AV_LOG_ERROR,
2645                            "interlaced frame in progressive sequence, ignoring\n");
2646                 }
2647
2648                 if (s2->picture_structure == 0 ||
2649                     (s2->progressive_frame && s2->picture_structure != PICT_FRAME)) {
2650                     av_log(s2->avctx, AV_LOG_ERROR,
2651                            "picture_structure %d invalid, ignoring\n",
2652                            s2->picture_structure);
2653                     s2->picture_structure = PICT_FRAME;
2654                 }
2655
2656                 if (s2->progressive_sequence && !s2->frame_pred_frame_dct)
2657                     av_log(s2->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
2658
2659                 if (s2->picture_structure == PICT_FRAME) {
2660                     s2->first_field = 0;
2661                     s2->v_edge_pos  = 16 * s2->mb_height;
2662                 } else {
2663                     s2->first_field ^= 1;
2664                     s2->v_edge_pos   = 8 * s2->mb_height;
2665                     memset(s2->mbskip_table, 0, s2->mb_stride * s2->mb_height);
2666                 }
2667             }
2668             if (start_code >= SLICE_MIN_START_CODE &&
2669                 start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2670                 const int field_pic = s2->picture_structure != PICT_FRAME;
2671                 int mb_y = start_code - SLICE_MIN_START_CODE;
2672                 last_code = SLICE_MIN_START_CODE;
2673                 if (s2->codec_id != AV_CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
2674                     mb_y += (*buf_ptr&0xE0)<<2;
2675
2676                 mb_y <<= field_pic;
2677                 if (s2->picture_structure == PICT_BOTTOM_FIELD)
2678                     mb_y++;
2679
2680                 if (buf_end - buf_ptr < 2) {
2681                     av_log(s2->avctx, AV_LOG_ERROR, "slice too small\n");
2682                     return AVERROR_INVALIDDATA;
2683                 }
2684
2685                 if (mb_y >= s2->mb_height) {
2686                     av_log(s2->avctx, AV_LOG_ERROR,
2687                            "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2688                     return AVERROR_INVALIDDATA;
2689                 }
2690
2691                 if (!s2->last_picture_ptr) {
2692                     /* Skip B-frames if we do not have reference frames and
2693                      * GOP is not closed. */
2694                     if (s2->pict_type == AV_PICTURE_TYPE_B) {
2695                         if (!s2->closed_gop) {
2696                             skip_frame = 1;
2697                             av_log(s2->avctx, AV_LOG_DEBUG,
2698                                    "Skipping B slice due to open GOP\n");
2699                             break;
2700                         }
2701                     }
2702                 }
2703                 if (s2->pict_type == AV_PICTURE_TYPE_I || (s2->avctx->flags2 & AV_CODEC_FLAG2_SHOW_ALL))
2704                     s->sync = 1;
2705                 if (!s2->next_picture_ptr) {
2706                     /* Skip P-frames if we do not have a reference frame or
2707                      * we have an invalid header. */
2708                     if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
2709                         skip_frame = 1;
2710                         av_log(s2->avctx, AV_LOG_DEBUG,
2711                                "Skipping P slice due to !sync\n");
2712                         break;
2713                     }
2714                 }
2715                 if ((avctx->skip_frame >= AVDISCARD_NONREF &&
2716                      s2->pict_type == AV_PICTURE_TYPE_B) ||
2717                     (avctx->skip_frame >= AVDISCARD_NONKEY &&
2718                      s2->pict_type != AV_PICTURE_TYPE_I) ||
2719                     avctx->skip_frame >= AVDISCARD_ALL) {
2720                     skip_frame = 1;
2721                     break;
2722                 }
2723
2724                 if (!s->mpeg_enc_ctx_allocated)
2725                     break;
2726
2727                 if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2728                     if (mb_y < avctx->skip_top ||
2729                         mb_y >= s2->mb_height - avctx->skip_bottom)
2730                         break;
2731                 }
2732
2733                 if (!s2->pict_type) {
2734                     av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2735                     if (avctx->err_recognition & AV_EF_EXPLODE)
2736                         return AVERROR_INVALIDDATA;
2737                     break;
2738                 }
2739
2740                 if (s->first_slice) {
2741                     skip_frame     = 0;
2742                     s->first_slice = 0;
2743                     if ((ret = mpeg_field_start(s2, buf, buf_size)) < 0)
2744                         return ret;
2745                 }
2746                 if (!s2->current_picture_ptr) {
2747                     av_log(avctx, AV_LOG_ERROR,
2748                            "current_picture not initialized\n");
2749                     return AVERROR_INVALIDDATA;
2750                 }
2751
2752                 if (HAVE_THREADS &&
2753                     (avctx->active_thread_type & FF_THREAD_SLICE) &&
2754                     !avctx->hwaccel) {
2755                     int threshold = (s2->mb_height * s->slice_count +
2756                                      s2->slice_context_count / 2) /
2757                                     s2->slice_context_count;
2758                     av_assert0(avctx->thread_count > 1);
2759                     if (threshold <= mb_y) {
2760                         MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2761
2762                         thread_context->start_mb_y = mb_y;
2763                         thread_context->end_mb_y   = s2->mb_height;
2764                         if (s->slice_count) {
2765                             s2->thread_context[s->slice_count - 1]->end_mb_y = mb_y;
2766                             ret = ff_update_duplicate_context(thread_context, s2);
2767                             if (ret < 0)
2768                                 return ret;
2769                         }
2770                         init_get_bits(&thread_context->gb, buf_ptr, input_size * 8);
2771                         s->slice_count++;
2772                     }
2773                     buf_ptr += 2; // FIXME add minimum number of bytes per slice
2774                 } else {
2775                     ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2776                     emms_c();
2777
2778                     if (ret < 0) {
2779                         if (avctx->err_recognition & AV_EF_EXPLODE)
2780                             return ret;
2781                         if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2782                             ff_er_add_slice(&s2->er, s2->resync_mb_x,
2783                                             s2->resync_mb_y, s2->mb_x, s2->mb_y,
2784                                             ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2785                     } else {
2786                         ff_er_add_slice(&s2->er, s2->resync_mb_x,
2787                                         s2->resync_mb_y, s2->mb_x - 1, s2->mb_y,
2788                                         ER_AC_END | ER_DC_END | ER_MV_END);
2789                     }
2790                 }
2791             }
2792             break;
2793         }
2794     }
2795 }
2796
2797 static int mpeg_decode_frame(AVCodecContext *avctx, void *data,
2798                              int *got_output, AVPacket *avpkt)
2799 {
2800     const uint8_t *buf = avpkt->data;
2801     int ret;
2802     int buf_size = avpkt->size;
2803     Mpeg1Context *s = avctx->priv_data;
2804     AVFrame *picture = data;
2805     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2806
2807     if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2808         /* special case for last picture */
2809         if (s2->low_delay == 0 && s2->next_picture_ptr) {
2810             int ret = av_frame_ref(picture, s2->next_picture_ptr->f);
2811             if (ret < 0)
2812                 return ret;
2813
2814             s2->next_picture_ptr = NULL;
2815
2816             *got_output = 1;
2817         }
2818         return buf_size;
2819     }
2820
2821     if (s2->avctx->flags & AV_CODEC_FLAG_TRUNCATED) {
2822         int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf,
2823                                            buf_size, NULL);
2824
2825         if (ff_combine_frame(&s2->parse_context, next,
2826                              (const uint8_t **) &buf, &buf_size) < 0)
2827             return buf_size;
2828     }
2829
2830     s2->codec_tag = avpriv_toupper4(avctx->codec_tag);
2831     if (s->mpeg_enc_ctx_allocated == 0 && (   s2->codec_tag == AV_RL32("VCR2")
2832                                            || s2->codec_tag == AV_RL32("BW10")
2833                                           ))
2834         vcr2_init_sequence(avctx);
2835
2836     s->slice_count = 0;
2837
2838     if (avctx->extradata && !s->extradata_decoded) {
2839         ret = decode_chunks(avctx, picture, got_output,
2840                             avctx->extradata, avctx->extradata_size);
2841         if (*got_output) {
2842             av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
2843             av_frame_unref(picture);
2844             *got_output = 0;
2845         }
2846         s->extradata_decoded = 1;
2847         if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) {
2848             s2->current_picture_ptr = NULL;
2849             return ret;
2850         }
2851     }
2852
2853     ret = decode_chunks(avctx, picture, got_output, buf, buf_size);
2854     if (ret<0 || *got_output) {
2855         s2->current_picture_ptr = NULL;
2856
2857         if (s2->timecode_frame_start != -1 && *got_output) {
2858             char tcbuf[AV_TIMECODE_STR_SIZE];
2859             AVFrameSideData *tcside = av_frame_new_side_data(picture,
2860                                                              AV_FRAME_DATA_GOP_TIMECODE,
2861                                                              sizeof(int64_t));
2862             if (!tcside)
2863                 return AVERROR(ENOMEM);
2864             memcpy(tcside->data, &s2->timecode_frame_start, sizeof(int64_t));
2865
2866             av_timecode_make_mpeg_tc_string(tcbuf, s2->timecode_frame_start);
2867             av_dict_set(&picture->metadata, "timecode", tcbuf, 0);
2868
2869             s2->timecode_frame_start = -1;
2870         }
2871     }
2872
2873     return ret;
2874 }
2875
2876 static void flush(AVCodecContext *avctx)
2877 {
2878     Mpeg1Context *s = avctx->priv_data;
2879
2880     s->sync       = 0;
2881
2882     ff_mpeg_flush(avctx);
2883 }
2884
2885 static av_cold int mpeg_decode_end(AVCodecContext *avctx)
2886 {
2887     Mpeg1Context *s = avctx->priv_data;
2888
2889     ff_mpv_common_end(&s->mpeg_enc_ctx);
2890     av_buffer_unref(&s->a53_buf_ref);
2891     return 0;
2892 }
2893
2894 AVCodec ff_mpeg1video_decoder = {
2895     .name                  = "mpeg1video",
2896     .long_name             = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2897     .type                  = AVMEDIA_TYPE_VIDEO,
2898     .id                    = AV_CODEC_ID_MPEG1VIDEO,
2899     .priv_data_size        = sizeof(Mpeg1Context),
2900     .init                  = mpeg_decode_init,
2901     .close                 = mpeg_decode_end,
2902     .decode                = mpeg_decode_frame,
2903     .capabilities          = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2904                              AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2905                              AV_CODEC_CAP_SLICE_THREADS,
2906     .caps_internal         = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM | FF_CODEC_CAP_INIT_CLEANUP,
2907     .flush                 = flush,
2908     .max_lowres            = 3,
2909     .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context),
2910     .hw_configs            = (const AVCodecHWConfigInternal*[]) {
2911 #if CONFIG_MPEG1_NVDEC_HWACCEL
2912                                HWACCEL_NVDEC(mpeg1),
2913 #endif
2914 #if CONFIG_MPEG1_VDPAU_HWACCEL
2915                                HWACCEL_VDPAU(mpeg1),
2916 #endif
2917 #if CONFIG_MPEG1_VIDEOTOOLBOX_HWACCEL
2918                                HWACCEL_VIDEOTOOLBOX(mpeg1),
2919 #endif
2920 #if CONFIG_MPEG1_XVMC_HWACCEL
2921                                HWACCEL_XVMC(mpeg1),
2922 #endif
2923                                NULL
2924                            },
2925 };
2926
2927 AVCodec ff_mpeg2video_decoder = {
2928     .name           = "mpeg2video",
2929     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2930     .type           = AVMEDIA_TYPE_VIDEO,
2931     .id             = AV_CODEC_ID_MPEG2VIDEO,
2932     .priv_data_size = sizeof(Mpeg1Context),
2933     .init           = mpeg_decode_init,
2934     .close          = mpeg_decode_end,
2935     .decode         = mpeg_decode_frame,
2936     .capabilities   = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2937                       AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2938                       AV_CODEC_CAP_SLICE_THREADS,
2939     .caps_internal  = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM | FF_CODEC_CAP_INIT_CLEANUP,
2940     .flush          = flush,
2941     .max_lowres     = 3,
2942     .profiles       = NULL_IF_CONFIG_SMALL(ff_mpeg2_video_profiles),
2943     .hw_configs     = (const AVCodecHWConfigInternal*[]) {
2944 #if CONFIG_MPEG2_DXVA2_HWACCEL
2945                         HWACCEL_DXVA2(mpeg2),
2946 #endif
2947 #if CONFIG_MPEG2_D3D11VA_HWACCEL
2948                         HWACCEL_D3D11VA(mpeg2),
2949 #endif
2950 #if CONFIG_MPEG2_D3D11VA2_HWACCEL
2951                         HWACCEL_D3D11VA2(mpeg2),
2952 #endif
2953 #if CONFIG_MPEG2_NVDEC_HWACCEL
2954                         HWACCEL_NVDEC(mpeg2),
2955 #endif
2956 #if CONFIG_MPEG2_VAAPI_HWACCEL
2957                         HWACCEL_VAAPI(mpeg2),
2958 #endif
2959 #if CONFIG_MPEG2_VDPAU_HWACCEL
2960                         HWACCEL_VDPAU(mpeg2),
2961 #endif
2962 #if CONFIG_MPEG2_VIDEOTOOLBOX_HWACCEL
2963                         HWACCEL_VIDEOTOOLBOX(mpeg2),
2964 #endif
2965 #if CONFIG_MPEG2_XVMC_HWACCEL
2966                         HWACCEL_XVMC(mpeg2),
2967 #endif
2968                         NULL
2969                     },
2970 };
2971
2972 //legacy decoder
2973 AVCodec ff_mpegvideo_decoder = {
2974     .name           = "mpegvideo",
2975     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2976     .type           = AVMEDIA_TYPE_VIDEO,
2977     .id             = AV_CODEC_ID_MPEG2VIDEO,
2978     .priv_data_size = sizeof(Mpeg1Context),
2979     .init           = mpeg_decode_init,
2980     .close          = mpeg_decode_end,
2981     .decode         = mpeg_decode_frame,
2982     .capabilities   = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 | AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SLICE_THREADS,
2983     .caps_internal  = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM | FF_CODEC_CAP_INIT_CLEANUP,
2984     .flush          = flush,
2985     .max_lowres     = 3,
2986 };