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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     uint8_t *a53_caption;
  61     int a53_caption_size;
  62     uint8_t afd;
  63     int has_afd;
  64     int slice_count;
  65     AVRational save_aspect;
  66     int save_width, save_height, save_progressive_seq;
  67     int rc_buffer_size;
  68     AVRational frame_rate_ext;  /* MPEG-2 specific framerate modificator */
  69     int sync;                   /* Did we reach a sync point like a GOP/SEQ/KEYFrame? */
  70     int tmpgexs;
  71     int first_slice;
  72     int extradata_decoded;
  73 } Mpeg1Context;
  74
  75 #define MB_TYPE_ZERO_MV   0x20000000
  76
  77 static const uint32_t ptype2mb_type[7] = {
  78                     MB_TYPE_INTRA,
  79                     MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
  80                     MB_TYPE_L0,
  81                     MB_TYPE_L0 | MB_TYPE_CBP,
  82     MB_TYPE_QUANT | MB_TYPE_INTRA,
  83     MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
  84     MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
  85 };
  86
  87 static const uint32_t btype2mb_type[11] = {
  88                     MB_TYPE_INTRA,
  89                     MB_TYPE_L1,
  90                     MB_TYPE_L1   | MB_TYPE_CBP,
  91                     MB_TYPE_L0,
  92                     MB_TYPE_L0   | MB_TYPE_CBP,
  93                     MB_TYPE_L0L1,
  94                     MB_TYPE_L0L1 | MB_TYPE_CBP,
  95     MB_TYPE_QUANT | MB_TYPE_INTRA,
  96     MB_TYPE_QUANT | MB_TYPE_L1   | MB_TYPE_CBP,
  97     MB_TYPE_QUANT | MB_TYPE_L0   | MB_TYPE_CBP,
  98     MB_TYPE_QUANT | MB_TYPE_L0L1 | MB_TYPE_CBP,
  99 };
 100
 101 /* as H.263, but only 17 codes */
 102 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
 103 {
 104     int code, sign, val, shift;
 105
 106     code = get_vlc2(&s->gb, ff_mv_vlc.table, MV_VLC_BITS, 2);
 107     if (code == 0)
 108         return pred;
 109     if (code < 0)
 110         return 0xffff;
 111
 112     sign  = get_bits1(&s->gb);
 113     shift = fcode - 1;
 114     val   = code;
 115     if (shift) {
 116         val  = (val - 1) << shift;
 117         val |= get_bits(&s->gb, shift);
 118         val++;
 119     }
 120     if (sign)
 121         val = -val;
 122     val += pred;
 123
 124     /* modulo decoding */
 125     return sign_extend(val, 5 + shift);
 126 }
 127
 128 #define MAX_INDEX (64 - 1)
 129 #define check_scantable_index(ctx, x)                                         \
 130     do {                                                                      \
 131         if ((x) > MAX_INDEX) {                                                \
 132             av_log(ctx->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n",     \
 133                    ctx->mb_x, ctx->mb_y);                                     \
 134             return AVERROR_INVALIDDATA;                                       \
 135         }                                                                     \
 136     } while (0)
 137
 138 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
 139                                            int16_t *block, int n)
 140 {
 141     int level, i, j, run;
 142     RLTable *rl                  = &ff_rl_mpeg1;
 143     uint8_t *const scantable     = s->intra_scantable.permutated;
 144     const uint16_t *quant_matrix = s->inter_matrix;
 145     const int qscale             = s->qscale;
 146
 147     {
 148         OPEN_READER(re, &s->gb);
 149         i = -1;
 150         // special case for first coefficient, no need to add second VLC table
 151         UPDATE_CACHE(re, &s->gb);
 152         if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
 153             level = (3 * qscale * quant_matrix[0]) >> 5;
 154             level = (level - 1) | 1;
 155             if (GET_CACHE(re, &s->gb) & 0x40000000)
 156                 level = -level;
 157             block[0] = level;
 158             i++;
 159             SKIP_BITS(re, &s->gb, 2);
 160             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
 161                 goto end;
 162         }
 163         /* now quantify & encode AC coefficients */
 164         for (;;) {
 165             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
 166                        TEX_VLC_BITS, 2, 0);
 167
 168             if (level != 0) {
 169                 i += run;
 170                 if (i > MAX_INDEX)
 171                     break;
 172                 j = scantable[i];
 173                 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 174                 level = (level - 1) | 1;
 175                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
 176                         SHOW_SBITS(re, &s->gb, 1);
 177                 SKIP_BITS(re, &s->gb, 1);
 178             } else {
 179                 /* escape */
 180                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
 181                 LAST_SKIP_BITS(re, &s->gb, 6);
 182                 UPDATE_CACHE(re, &s->gb);
 183                 level = SHOW_SBITS(re, &s->gb, 8);
 184                 SKIP_BITS(re, &s->gb, 8);
 185                 if (level == -128) {
 186                     level = SHOW_UBITS(re, &s->gb, 8) - 256;
 187                     SKIP_BITS(re, &s->gb, 8);
 188                 } else if (level == 0) {
 189                     level = SHOW_UBITS(re, &s->gb, 8);
 190                     SKIP_BITS(re, &s->gb, 8);
 191                 }
 192                 i += run;
 193                 if (i > MAX_INDEX)
 194                     break;
 195                 j = scantable[i];
 196                 if (level < 0) {
 197                     level = -level;
 198                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 199                     level = (level - 1) | 1;
 200                     level = -level;
 201                 } else {
 202                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 203                     level = (level - 1) | 1;
 204                 }
 205             }
 206
 207             block[j] = level;
 208             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
 209                 break;
 210             UPDATE_CACHE(re, &s->gb);
 211         }
 212 end:
 213         LAST_SKIP_BITS(re, &s->gb, 2);
 214         CLOSE_READER(re, &s->gb);
 215     }
 216
 217     check_scantable_index(s, i);
 218
 219     s->block_last_index[n] = i;
 220     return 0;
 221 }
 222
 223 /**
 224  * Changing this would eat up any speed benefits it has.
 225  * Do not use "fast" flag if you need the code to be robust.
 226  */
 227 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s,
 228                                                 int16_t *block, int n)
 229 {
 230     int level, i, j, run;
 231     RLTable *rl              = &ff_rl_mpeg1;
 232     uint8_t *const scantable = s->intra_scantable.permutated;
 233     const int qscale         = s->qscale;
 234
 235     {
 236         OPEN_READER(re, &s->gb);
 237         i = -1;
 238         // Special case for first coefficient, no need to add second VLC table.
 239         UPDATE_CACHE(re, &s->gb);
 240         if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
 241             level = (3 * qscale) >> 1;
 242             level = (level - 1) | 1;
 243             if (GET_CACHE(re, &s->gb) & 0x40000000)
 244                 level = -level;
 245             block[0] = level;
 246             i++;
 247             SKIP_BITS(re, &s->gb, 2);
 248             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
 249                 goto end;
 250         }
 251
 252         /* now quantify & encode AC coefficients */
 253         for (;;) {
 254             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
 255                        TEX_VLC_BITS, 2, 0);
 256
 257             if (level != 0) {
 258                 i += run;
 259                 if (i > MAX_INDEX)
 260                     break;
 261                 j = scantable[i];
 262                 level = ((level * 2 + 1) * qscale) >> 1;
 263                 level = (level - 1) | 1;
 264                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
 265                         SHOW_SBITS(re, &s->gb, 1);
 266                 SKIP_BITS(re, &s->gb, 1);
 267             } else {
 268                 /* escape */
 269                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
 270                 LAST_SKIP_BITS(re, &s->gb, 6);
 271                 UPDATE_CACHE(re, &s->gb);
 272                 level = SHOW_SBITS(re, &s->gb, 8);
 273                 SKIP_BITS(re, &s->gb, 8);
 274                 if (level == -128) {
 275                     level = SHOW_UBITS(re, &s->gb, 8) - 256;
 276                     SKIP_BITS(re, &s->gb, 8);
 277                 } else if (level == 0) {
 278                     level = SHOW_UBITS(re, &s->gb, 8);
 279                     SKIP_BITS(re, &s->gb, 8);
 280                 }
 281                 i += run;
 282                 if (i > MAX_INDEX)
 283                     break;
 284                 j = scantable[i];
 285                 if (level < 0) {
 286                     level = -level;
 287                     level = ((level * 2 + 1) * qscale) >> 1;
 288                     level = (level - 1) | 1;
 289                     level = -level;
 290                 } else {
 291                     level = ((level * 2 + 1) * qscale) >> 1;
 292                     level = (level - 1) | 1;
 293                 }
 294             }
 295
 296             block[j] = level;
 297             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
 298                 break;
 299             UPDATE_CACHE(re, &s->gb);
 300         }
 301 end:
 302         LAST_SKIP_BITS(re, &s->gb, 2);
 303         CLOSE_READER(re, &s->gb);
 304     }
 305
 306     check_scantable_index(s, i);
 307
 308     s->block_last_index[n] = i;
 309     return 0;
 310 }
 311
 312 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
 313                                                int16_t *block, int n)
 314 {
 315     int level, i, j, run;
 316     RLTable *rl = &ff_rl_mpeg1;
 317     uint8_t *const scantable = s->intra_scantable.permutated;
 318     const uint16_t *quant_matrix;
 319     const int qscale = s->qscale;
 320     int mismatch;
 321
 322     mismatch = 1;
 323
 324     {
 325         OPEN_READER(re, &s->gb);
 326         i = -1;
 327         if (n < 4)
 328             quant_matrix = s->inter_matrix;
 329         else
 330             quant_matrix = s->chroma_inter_matrix;
 331
 332         // Special case for first coefficient, no need to add second VLC table.
 333         UPDATE_CACHE(re, &s->gb);
 334         if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
 335             level = (3 * qscale * quant_matrix[0]) >> 5;
 336             if (GET_CACHE(re, &s->gb) & 0x40000000)
 337                 level = -level;
 338             block[0]  = level;
 339             mismatch ^= level;
 340             i++;
 341             SKIP_BITS(re, &s->gb, 2);
 342             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
 343                 goto end;
 344         }
 345
 346         /* now quantify & encode AC coefficients */
 347         for (;;) {
 348             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
 349                        TEX_VLC_BITS, 2, 0);
 350
 351             if (level != 0) {
 352                 i += run;
 353                 if (i > MAX_INDEX)
 354                     break;
 355                 j = scantable[i];
 356                 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 357                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
 358                         SHOW_SBITS(re, &s->gb, 1);
 359                 SKIP_BITS(re, &s->gb, 1);
 360             } else {
 361                 /* escape */
 362                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
 363                 LAST_SKIP_BITS(re, &s->gb, 6);
 364                 UPDATE_CACHE(re, &s->gb);
 365                 level = SHOW_SBITS(re, &s->gb, 12);
 366                 SKIP_BITS(re, &s->gb, 12);
 367
 368                 i += run;
 369                 if (i > MAX_INDEX)
 370                     break;
 371                 j = scantable[i];
 372                 if (level < 0) {
 373                     level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 374                     level = -level;
 375                 } else {
 376                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 377                 }
 378             }
 379
 380             mismatch ^= level;
 381             block[j]  = level;
 382             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
 383                 break;
 384             UPDATE_CACHE(re, &s->gb);
 385         }
 386 end:
 387         LAST_SKIP_BITS(re, &s->gb, 2);
 388         CLOSE_READER(re, &s->gb);
 389     }
 390     block[63] ^= (mismatch & 1);
 391
 392     check_scantable_index(s, i);
 393
 394     s->block_last_index[n] = i;
 395     return 0;
 396 }
 397
 398 /**
 399  * Changing this would eat up any speed benefits it has.
 400  * Do not use "fast" flag if you need the code to be robust.
 401  */
 402 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
 403                                                     int16_t *block, int n)
 404 {
 405     int level, i, j, run;
 406     RLTable *rl              = &ff_rl_mpeg1;
 407     uint8_t *const scantable = s->intra_scantable.permutated;
 408     const int qscale         = s->qscale;
 409     OPEN_READER(re, &s->gb);
 410     i = -1;
 411
 412     // special case for first coefficient, no need to add second VLC table
 413     UPDATE_CACHE(re, &s->gb);
 414     if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
 415         level = (3 * qscale) >> 1;
 416         if (GET_CACHE(re, &s->gb) & 0x40000000)
 417             level = -level;
 418         block[0] = level;
 419         i++;
 420         SKIP_BITS(re, &s->gb, 2);
 421         if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
 422             goto end;
 423     }
 424
 425     /* now quantify & encode AC coefficients */
 426     for (;;) {
 427         GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
 428
 429         if (level != 0) {
 430             i += run;
 431             if (i > MAX_INDEX)
 432                 break;
 433             j = scantable[i];
 434             level = ((level * 2 + 1) * qscale) >> 1;
 435             level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
 436                     SHOW_SBITS(re, &s->gb, 1);
 437             SKIP_BITS(re, &s->gb, 1);
 438         } else {
 439             /* escape */
 440             run = SHOW_UBITS(re, &s->gb, 6) + 1;
 441             LAST_SKIP_BITS(re, &s->gb, 6);
 442             UPDATE_CACHE(re, &s->gb);
 443             level = SHOW_SBITS(re, &s->gb, 12);
 444             SKIP_BITS(re, &s->gb, 12);
 445
 446             i += run;
 447             if (i > MAX_INDEX)
 448                 break;
 449             j = scantable[i];
 450             if (level < 0) {
 451                 level = ((-level * 2 + 1) * qscale) >> 1;
 452                 level = -level;
 453             } else {
 454                 level = ((level * 2 + 1) * qscale) >> 1;
 455             }
 456         }
 457
 458         block[j] = level;
 459         if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF || i > 63)
 460             break;
 461
 462         UPDATE_CACHE(re, &s->gb);
 463     }
 464 end:
 465     LAST_SKIP_BITS(re, &s->gb, 2);
 466     CLOSE_READER(re, &s->gb);
 467
 468     check_scantable_index(s, i);
 469
 470     s->block_last_index[n] = i;
 471     return 0;
 472 }
 473
 474 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
 475                                            int16_t *block, int n)
 476 {
 477     int level, dc, diff, i, j, run;
 478     int component;
 479     RLTable *rl;
 480     uint8_t *const scantable = s->intra_scantable.permutated;
 481     const uint16_t *quant_matrix;
 482     const int qscale = s->qscale;
 483     int mismatch;
 484
 485     /* DC coefficient */
 486     if (n < 4) {
 487         quant_matrix = s->intra_matrix;
 488         component    = 0;
 489     } else {
 490         quant_matrix = s->chroma_intra_matrix;
 491         component    = (n & 1) + 1;
 492     }
 493     diff = decode_dc(&s->gb, component);
 494     if (diff >= 0xffff)
 495         return AVERROR_INVALIDDATA;
 496     dc  = s->last_dc[component];
 497     dc += diff;
 498     s->last_dc[component] = dc;
 499     block[0] = dc * (1 << (3 - s->intra_dc_precision));
 500     ff_tlog(s->avctx, "dc=%d\n", block[0]);
 501     mismatch = block[0] ^ 1;
 502     i = 0;
 503     if (s->intra_vlc_format)
 504         rl = &ff_rl_mpeg2;
 505     else
 506         rl = &ff_rl_mpeg1;
 507
 508     {
 509         OPEN_READER(re, &s->gb);
 510         /* now quantify & encode AC coefficients */
 511         for (;;) {
 512             UPDATE_CACHE(re, &s->gb);
 513             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
 514                        TEX_VLC_BITS, 2, 0);
 515
 516             if (level == 127) {
 517                 break;
 518             } else if (level != 0) {
 519                 i += run;
 520                 if (i > MAX_INDEX)
 521                     break;
 522                 j = scantable[i];
 523                 level = (level * qscale * quant_matrix[j]) >> 4;
 524                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
 525                         SHOW_SBITS(re, &s->gb, 1);
 526                 LAST_SKIP_BITS(re, &s->gb, 1);
 527             } else {
 528                 /* escape */
 529                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
 530                 LAST_SKIP_BITS(re, &s->gb, 6);
 531                 UPDATE_CACHE(re, &s->gb);
 532                 level = SHOW_SBITS(re, &s->gb, 12);
 533                 SKIP_BITS(re, &s->gb, 12);
 534                 i += run;
 535                 if (i > MAX_INDEX)
 536                     break;
 537                 j = scantable[i];
 538                 if (level < 0) {
 539                     level = (-level * qscale * quant_matrix[j]) >> 4;
 540                     level = -level;
 541                 } else {
 542                     level = (level * qscale * quant_matrix[j]) >> 4;
 543                 }
 544             }
 545
 546             mismatch ^= level;
 547             block[j]  = level;
 548         }
 549         CLOSE_READER(re, &s->gb);
 550     }
 551     block[63] ^= mismatch & 1;
 552
 553     check_scantable_index(s, i);
 554
 555     s->block_last_index[n] = i;
 556     return 0;
 557 }
 558
 559 /**
 560  * Changing this would eat up any speed benefits it has.
 561  * Do not use "fast" flag if you need the code to be robust.
 562  */
 563 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
 564                                                 int16_t *block, int n)
 565 {
 566     int level, dc, diff, i, j, run;
 567     int component;
 568     RLTable *rl;
 569     uint8_t *const scantable = s->intra_scantable.permutated;
 570     const uint16_t *quant_matrix;
 571     const int qscale = s->qscale;
 572
 573     /* DC coefficient */
 574     if (n < 4) {
 575         quant_matrix = s->intra_matrix;
 576         component    = 0;
 577     } else {
 578         quant_matrix = s->chroma_intra_matrix;
 579         component    = (n & 1) + 1;
 580     }
 581     diff = decode_dc(&s->gb, component);
 582     if (diff >= 0xffff)
 583         return AVERROR_INVALIDDATA;
 584     dc = s->last_dc[component];
 585     dc += diff;
 586     s->last_dc[component] = dc;
 587     block[0] = dc * (1 << (3 - s->intra_dc_precision));
 588     i = 0;
 589     if (s->intra_vlc_format)
 590         rl = &ff_rl_mpeg2;
 591     else
 592         rl = &ff_rl_mpeg1;
 593
 594     {
 595         OPEN_READER(re, &s->gb);
 596         /* now quantify & encode AC coefficients */
 597         for (;;) {
 598             UPDATE_CACHE(re, &s->gb);
 599             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
 600                        TEX_VLC_BITS, 2, 0);
 601
 602             if (level >= 64 || i > 63) {
 603                 break;
 604             } else if (level != 0) {
 605                 i += run;
 606                 j = scantable[i];
 607                 level = (level * qscale * quant_matrix[j]) >> 4;
 608                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
 609                         SHOW_SBITS(re, &s->gb, 1);
 610                 LAST_SKIP_BITS(re, &s->gb, 1);
 611             } else {
 612                 /* escape */
 613                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
 614                 LAST_SKIP_BITS(re, &s->gb, 6);
 615                 UPDATE_CACHE(re, &s->gb);
 616                 level = SHOW_SBITS(re, &s->gb, 12);
 617                 SKIP_BITS(re, &s->gb, 12);
 618                 i += run;
 619                 j = scantable[i];
 620                 if (level < 0) {
 621                     level = (-level * qscale * quant_matrix[j]) >> 4;
 622                     level = -level;
 623                 } else {
 624                     level = (level * qscale * quant_matrix[j]) >> 4;
 625                 }
 626             }
 627
 628             block[j] = level;
 629         }
 630         CLOSE_READER(re, &s->gb);
 631     }
 632
 633     check_scantable_index(s, i);
 634
 635     s->block_last_index[n] = i;
 636     return 0;
 637 }
 638
 639 /******************************************/
 640 /* decoding */
 641
 642 static inline int get_dmv(MpegEncContext *s)
 643 {
 644     if (get_bits1(&s->gb))
 645         return 1 - (get_bits1(&s->gb) << 1);
 646     else
 647         return 0;
 648 }
 649
 650 /* motion type (for MPEG-2) */
 651 #define MT_FIELD 1
 652 #define MT_FRAME 2
 653 #define MT_16X8  2
 654 #define MT_DMV   3
 655
 656 static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
 657 {
 658     int i, j, k, cbp, val, mb_type, motion_type;
 659     const int mb_block_count = 4 + (1 << s->chroma_format);
 660     int ret;
 661
 662     ff_tlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
 663
 664     av_assert2(s->mb_skipped == 0);
 665
 666     if (s->mb_skip_run-- != 0) {
 667         if (s->pict_type == AV_PICTURE_TYPE_P) {
 668             s->mb_skipped = 1;
 669             s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
 670                 MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
 671         } else {
 672             int mb_type;
 673
 674             if (s->mb_x)
 675                 mb_type = s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
 676             else
 677                 // FIXME not sure if this is allowed in MPEG at all
 678                 mb_type = s->current_picture.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1];
 679             if (IS_INTRA(mb_type)) {
 680                 av_log(s->avctx, AV_LOG_ERROR, "skip with previntra\n");
 681                 return AVERROR_INVALIDDATA;
 682             }
 683             s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
 684                 mb_type | MB_TYPE_SKIP;
 685
 686             if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
 687                 s->mb_skipped = 1;
 688         }
 689
 690         return 0;
 691     }
 692
 693     switch (s->pict_type) {
 694     default:
 695     case AV_PICTURE_TYPE_I:
 696         if (get_bits1(&s->gb) == 0) {
 697             if (get_bits1(&s->gb) == 0) {
 698                 av_log(s->avctx, AV_LOG_ERROR,
 699                        "Invalid mb type in I-frame at %d %d\n",
 700                        s->mb_x, s->mb_y);
 701                 return AVERROR_INVALIDDATA;
 702             }
 703             mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
 704         } else {
 705             mb_type = MB_TYPE_INTRA;
 706         }
 707         break;
 708     case AV_PICTURE_TYPE_P:
 709         mb_type = get_vlc2(&s->gb, ff_mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
 710         if (mb_type < 0) {
 711             av_log(s->avctx, AV_LOG_ERROR,
 712                    "Invalid mb type in P-frame at %d %d\n", s->mb_x, s->mb_y);
 713             return AVERROR_INVALIDDATA;
 714         }
 715         mb_type = ptype2mb_type[mb_type];
 716         break;
 717     case AV_PICTURE_TYPE_B:
 718         mb_type = get_vlc2(&s->gb, ff_mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
 719         if (mb_type < 0) {
 720             av_log(s->avctx, AV_LOG_ERROR,
 721                    "Invalid mb type in B-frame at %d %d\n", s->mb_x, s->mb_y);
 722             return AVERROR_INVALIDDATA;
 723         }
 724         mb_type = btype2mb_type[mb_type];
 725         break;
 726     }
 727     ff_tlog(s->avctx, "mb_type=%x\n", mb_type);
 728 //    motion_type = 0; /* avoid warning */
 729     if (IS_INTRA(mb_type)) {
 730         s->bdsp.clear_blocks(s->block[0]);
 731
 732         if (!s->chroma_y_shift)
 733             s->bdsp.clear_blocks(s->block[6]);
 734
 735         /* compute DCT type */
 736         // FIXME: add an interlaced_dct coded var?
 737         if (s->picture_structure == PICT_FRAME &&
 738             !s->frame_pred_frame_dct)
 739             s->interlaced_dct = get_bits1(&s->gb);
 740
 741         if (IS_QUANT(mb_type))
 742             s->qscale = mpeg_get_qscale(s);
 743
 744         if (s->concealment_motion_vectors) {
 745             /* just parse them */
 746             if (s->picture_structure != PICT_FRAME)
 747                 skip_bits1(&s->gb);  /* field select */
 748
 749             s->mv[0][0][0]      =
 750             s->last_mv[0][0][0] =
 751             s->last_mv[0][1][0] = mpeg_decode_motion(s, s->mpeg_f_code[0][0],
 752                                                      s->last_mv[0][0][0]);
 753             s->mv[0][0][1]      =
 754             s->last_mv[0][0][1] =
 755             s->last_mv[0][1][1] = mpeg_decode_motion(s, s->mpeg_f_code[0][1],
 756                                                      s->last_mv[0][0][1]);
 757
 758             check_marker(s->avctx, &s->gb, "after concealment_motion_vectors");
 759         } else {
 760             /* reset mv prediction */
 761             memset(s->last_mv, 0, sizeof(s->last_mv));
 762         }
 763         s->mb_intra = 1;
 764         // if 1, we memcpy blocks in xvmcvideo
 765         if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
 766             ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
 767
 768         if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
 769             if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
 770                 for (i = 0; i < 6; i++)
 771                     mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
 772             } else {
 773                 for (i = 0; i < mb_block_count; i++)
 774                     if ((ret = mpeg2_decode_block_intra(s, *s->pblocks[i], i)) < 0)
 775                         return ret;
 776             }
 777         } else {
 778             for (i = 0; i < 6; i++) {
 779                 ret = ff_mpeg1_decode_block_intra(&s->gb,
 780                                                   s->intra_matrix,
 781                                                   s->intra_scantable.permutated,
 782                                                   s->last_dc, *s->pblocks[i],
 783                                                   i, s->qscale);
 784                 if (ret < 0) {
 785                     av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n",
 786                            s->mb_x, s->mb_y);
 787                     return ret;
 788                 }
 789
 790                 s->block_last_index[i] = ret;
 791             }
 792         }
 793     } else {
 794         if (mb_type & MB_TYPE_ZERO_MV) {
 795             av_assert2(mb_type & MB_TYPE_CBP);
 796
 797             s->mv_dir = MV_DIR_FORWARD;
 798             if (s->picture_structure == PICT_FRAME) {
 799                 if (s->picture_structure == PICT_FRAME
 800                     && !s->frame_pred_frame_dct)
 801                     s->interlaced_dct = get_bits1(&s->gb);
 802                 s->mv_type = MV_TYPE_16X16;
 803             } else {
 804                 s->mv_type            = MV_TYPE_FIELD;
 805                 mb_type              |= MB_TYPE_INTERLACED;
 806                 s->field_select[0][0] = s->picture_structure - 1;
 807             }
 808
 809             if (IS_QUANT(mb_type))
 810                 s->qscale = mpeg_get_qscale(s);
 811
 812             s->last_mv[0][0][0] = 0;
 813             s->last_mv[0][0][1] = 0;
 814             s->last_mv[0][1][0] = 0;
 815             s->last_mv[0][1][1] = 0;
 816             s->mv[0][0][0]      = 0;
 817             s->mv[0][0][1]      = 0;
 818         } else {
 819             av_assert2(mb_type & MB_TYPE_L0L1);
 820             // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
 821             /* get additional motion vector type */
 822             if (s->picture_structure == PICT_FRAME && s->frame_pred_frame_dct) {
 823                 motion_type = MT_FRAME;
 824             } else {
 825                 motion_type = get_bits(&s->gb, 2);
 826                 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
 827                     s->interlaced_dct = get_bits1(&s->gb);
 828             }
 829
 830             if (IS_QUANT(mb_type))
 831                 s->qscale = mpeg_get_qscale(s);
 832
 833             /* motion vectors */
 834             s->mv_dir = (mb_type >> 13) & 3;
 835             ff_tlog(s->avctx, "motion_type=%d\n", motion_type);
 836             switch (motion_type) {
 837             case MT_FRAME: /* or MT_16X8 */
 838                 if (s->picture_structure == PICT_FRAME) {
 839                     mb_type   |= MB_TYPE_16x16;
 840                     s->mv_type = MV_TYPE_16X16;
 841                     for (i = 0; i < 2; i++) {
 842                         if (USES_LIST(mb_type, i)) {
 843                             /* MT_FRAME */
 844                             s->mv[i][0][0]      =
 845                             s->last_mv[i][0][0] =
 846                             s->last_mv[i][1][0] =
 847                                 mpeg_decode_motion(s, s->mpeg_f_code[i][0],
 848                                                    s->last_mv[i][0][0]);
 849                             s->mv[i][0][1]      =
 850                             s->last_mv[i][0][1] =
 851                             s->last_mv[i][1][1] =
 852                                 mpeg_decode_motion(s, s->mpeg_f_code[i][1],
 853                                                    s->last_mv[i][0][1]);
 854                             /* full_pel: only for MPEG-1 */
 855                             if (s->full_pel[i]) {
 856                                 s->mv[i][0][0] *= 2;
 857                                 s->mv[i][0][1] *= 2;
 858                             }
 859                         }
 860                     }
 861                 } else {
 862                     mb_type   |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
 863                     s->mv_type = MV_TYPE_16X8;
 864                     for (i = 0; i < 2; i++) {
 865                         if (USES_LIST(mb_type, i)) {
 866                             /* MT_16X8 */
 867                             for (j = 0; j < 2; j++) {
 868                                 s->field_select[i][j] = get_bits1(&s->gb);
 869                                 for (k = 0; k < 2; k++) {
 870                                     val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
 871                                                              s->last_mv[i][j][k]);
 872                                     s->last_mv[i][j][k] = val;
 873                                     s->mv[i][j][k]      = val;
 874                                 }
 875                             }
 876                         }
 877                     }
 878                 }
 879                 break;
 880             case MT_FIELD:
 881                 s->mv_type = MV_TYPE_FIELD;
 882                 if (s->picture_structure == PICT_FRAME) {
 883                     mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
 884                     for (i = 0; i < 2; i++) {
 885                         if (USES_LIST(mb_type, i)) {
 886                             for (j = 0; j < 2; j++) {
 887                                 s->field_select[i][j] = get_bits1(&s->gb);
 888                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
 889                                                          s->last_mv[i][j][0]);
 890                                 s->last_mv[i][j][0] = val;
 891                                 s->mv[i][j][0]      = val;
 892                                 ff_tlog(s->avctx, "fmx=%d\n", val);
 893                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
 894                                                          s->last_mv[i][j][1] >> 1);
 895                                 s->last_mv[i][j][1] = 2 * val;
 896                                 s->mv[i][j][1]      = val;
 897                                 ff_tlog(s->avctx, "fmy=%d\n", val);
 898                             }
 899                         }
 900                     }
 901                 } else {
 902                     av_assert0(!s->progressive_sequence);
 903                     mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
 904                     for (i = 0; i < 2; i++) {
 905                         if (USES_LIST(mb_type, i)) {
 906                             s->field_select[i][0] = get_bits1(&s->gb);
 907                             for (k = 0; k < 2; k++) {
 908                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
 909                                                          s->last_mv[i][0][k]);
 910                                 s->last_mv[i][0][k] = val;
 911                                 s->last_mv[i][1][k] = val;
 912                                 s->mv[i][0][k]      = val;
 913                             }
 914                         }
 915                     }
 916                 }
 917                 break;
 918             case MT_DMV:
 919                 if (s->progressive_sequence){
 920                     av_log(s->avctx, AV_LOG_ERROR, "MT_DMV in progressive_sequence\n");
 921                     return AVERROR_INVALIDDATA;
 922                 }
 923                 s->mv_type = MV_TYPE_DMV;
 924                 for (i = 0; i < 2; i++) {
 925                     if (USES_LIST(mb_type, i)) {
 926                         int dmx, dmy, mx, my, m;
 927                         const int my_shift = s->picture_structure == PICT_FRAME;
 928
 929                         mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
 930                                                 s->last_mv[i][0][0]);
 931                         s->last_mv[i][0][0] = mx;
 932                         s->last_mv[i][1][0] = mx;
 933                         dmx = get_dmv(s);
 934                         my  = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
 935                                                  s->last_mv[i][0][1] >> my_shift);
 936                         dmy = get_dmv(s);
 937
 938
 939                         s->last_mv[i][0][1] = my * (1 << my_shift);
 940                         s->last_mv[i][1][1] = my * (1 << my_shift);
 941
 942                         s->mv[i][0][0] = mx;
 943                         s->mv[i][0][1] = my;
 944                         s->mv[i][1][0] = mx; // not used
 945                         s->mv[i][1][1] = my; // not used
 946
 947                         if (s->picture_structure == PICT_FRAME) {
 948                             mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
 949
 950                             // m = 1 + 2 * s->top_field_first;
 951                             m = s->top_field_first ? 1 : 3;
 952
 953                             /* top -> top pred */
 954                             s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
 955                             s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
 956                             m = 4 - m;
 957                             s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
 958                             s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
 959                         } else {
 960                             mb_type |= MB_TYPE_16x16;
 961
 962                             s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
 963                             s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
 964                             if (s->picture_structure == PICT_TOP_FIELD)
 965                                 s->mv[i][2][1]--;
 966                             else
 967                                 s->mv[i][2][1]++;
 968                         }
 969                     }
 970                 }
 971                 break;
 972             default:
 973                 av_log(s->avctx, AV_LOG_ERROR,
 974                        "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
 975                 return AVERROR_INVALIDDATA;
 976             }
 977         }
 978
 979         s->mb_intra = 0;
 980         if (HAS_CBP(mb_type)) {
 981             s->bdsp.clear_blocks(s->block[0]);
 982
 983             cbp = get_vlc2(&s->gb, ff_mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
 984             if (mb_block_count > 6) {
 985                 cbp *= 1 << mb_block_count - 6;
 986                 cbp  |= get_bits(&s->gb, mb_block_count - 6);
 987                 s->bdsp.clear_blocks(s->block[6]);
 988             }
 989             if (cbp <= 0) {
 990                 av_log(s->avctx, AV_LOG_ERROR,
 991                        "invalid cbp %d at %d %d\n", cbp, s->mb_x, s->mb_y);
 992                 return AVERROR_INVALIDDATA;
 993             }
 994
 995             // if 1, we memcpy blocks in xvmcvideo
 996             if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
 997                 ff_xvmc_pack_pblocks(s, cbp);
 998
 999             if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
1000                 if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
1001                     for (i = 0; i < 6; i++) {
1002                         if (cbp & 32)
1003                             mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
1004                         else
1005                             s->block_last_index[i] = -1;
1006                         cbp += cbp;
1007                     }
1008                 } else {
1009                     cbp <<= 12 - mb_block_count;
1010
1011                     for (i = 0; i < mb_block_count; i++) {
1012                         if (cbp & (1 << 11)) {
1013                             if ((ret = mpeg2_decode_block_non_intra(s, *s->pblocks[i], i)) < 0)
1014                                 return ret;
1015                         } else {
1016                             s->block_last_index[i] = -1;
1017                         }
1018                         cbp += cbp;
1019                     }
1020                 }
1021             } else {
1022                 if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
1023                     for (i = 0; i < 6; i++) {
1024                         if (cbp & 32)
1025                             mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1026                         else
1027                             s->block_last_index[i] = -1;
1028                         cbp += cbp;
1029                     }
1030                 } else {
1031                     for (i = 0; i < 6; i++) {
1032                         if (cbp & 32) {
1033                             if ((ret = mpeg1_decode_block_inter(s, *s->pblocks[i], i)) < 0)
1034                                 return ret;
1035                         } else {
1036                             s->block_last_index[i] = -1;
1037                         }
1038                         cbp += cbp;
1039                     }
1040                 }
1041             }
1042         } else {
1043             for (i = 0; i < 12; i++)
1044                 s->block_last_index[i] = -1;
1045         }
1046     }
1047
1048     s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1049
1050     return 0;
1051 }
1052
1053 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1054 {
1055     Mpeg1Context *s    = avctx->priv_data;
1056     MpegEncContext *s2 = &s->mpeg_enc_ctx;
1057
1058     ff_mpv_decode_defaults(s2);
1059
1060     if (   avctx->codec_tag != AV_RL32("VCR2")
1061         && avctx->codec_tag != AV_RL32("BW10"))
1062         avctx->coded_width = avctx->coded_height = 0; // do not trust dimensions from input
1063     ff_mpv_decode_init(s2, avctx);
1064
1065     s->mpeg_enc_ctx.avctx  = avctx;
1066
1067     /* we need some permutation to store matrices,
1068      * until the decoder sets the real permutation. */
1069     ff_mpv_idct_init(s2);
1070     ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1071     ff_mpeg12_init_vlcs();
1072
1073     s2->chroma_format              = 1;
1074     s->mpeg_enc_ctx_allocated      = 0;
1075     s->mpeg_enc_ctx.picture_number = 0;
1076     s->repeat_field                = 0;
1077     s->mpeg_enc_ctx.codec_id       = avctx->codec->id;
1078     avctx->color_range             = AVCOL_RANGE_MPEG;
1079     return 0;
1080 }
1081
1082 #if HAVE_THREADS
1083 static int mpeg_decode_update_thread_context(AVCodecContext *avctx,
1084                                              const AVCodecContext *avctx_from)
1085 {
1086     Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1087     MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1088     int err;
1089
1090     if (avctx == avctx_from               ||
1091         !ctx_from->mpeg_enc_ctx_allocated ||
1092         !s1->context_initialized)
1093         return 0;
1094
1095     err = ff_mpeg_update_thread_context(avctx, avctx_from);
1096     if (err)
1097         return err;
1098
1099     if (!ctx->mpeg_enc_ctx_allocated)
1100         memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1101
1102     if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1103         s->picture_number++;
1104
1105     return 0;
1106 }
1107 #endif
1108
1109 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1110                                  const uint8_t *new_perm)
1111 {
1112     uint16_t temp_matrix[64];
1113     int i;
1114
1115     memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1116
1117     for (i = 0; i < 64; i++)
1118         matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1119 }
1120
1121 static const enum AVPixelFormat mpeg1_hwaccel_pixfmt_list_420[] = {
1122 #if CONFIG_MPEG1_NVDEC_HWACCEL
1123     AV_PIX_FMT_CUDA,
1124 #endif
1125 #if CONFIG_MPEG1_XVMC_HWACCEL
1126     AV_PIX_FMT_XVMC,
1127 #endif
1128 #if CONFIG_MPEG1_VDPAU_HWACCEL
1129     AV_PIX_FMT_VDPAU,
1130 #endif
1131     AV_PIX_FMT_YUV420P,
1132     AV_PIX_FMT_NONE
1133 };
1134
1135 static const enum AVPixelFormat mpeg2_hwaccel_pixfmt_list_420[] = {
1136 #if CONFIG_MPEG2_NVDEC_HWACCEL
1137     AV_PIX_FMT_CUDA,
1138 #endif
1139 #if CONFIG_MPEG2_XVMC_HWACCEL
1140     AV_PIX_FMT_XVMC,
1141 #endif
1142 #if CONFIG_MPEG2_VDPAU_HWACCEL
1143     AV_PIX_FMT_VDPAU,
1144 #endif
1145 #if CONFIG_MPEG2_DXVA2_HWACCEL
1146     AV_PIX_FMT_DXVA2_VLD,
1147 #endif
1148 #if CONFIG_MPEG2_D3D11VA_HWACCEL
1149     AV_PIX_FMT_D3D11VA_VLD,
1150     AV_PIX_FMT_D3D11,
1151 #endif
1152 #if CONFIG_MPEG2_VAAPI_HWACCEL
1153     AV_PIX_FMT_VAAPI,
1154 #endif
1155 #if CONFIG_MPEG2_VIDEOTOOLBOX_HWACCEL
1156     AV_PIX_FMT_VIDEOTOOLBOX,
1157 #endif
1158     AV_PIX_FMT_YUV420P,
1159     AV_PIX_FMT_NONE
1160 };
1161
1162 static const enum AVPixelFormat mpeg12_pixfmt_list_422[] = {
1163     AV_PIX_FMT_YUV422P,
1164     AV_PIX_FMT_NONE
1165 };
1166
1167 static const enum AVPixelFormat mpeg12_pixfmt_list_444[] = {
1168     AV_PIX_FMT_YUV444P,
1169     AV_PIX_FMT_NONE
1170 };
1171
1172 static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
1173 {
1174     Mpeg1Context *s1  = avctx->priv_data;
1175     MpegEncContext *s = &s1->mpeg_enc_ctx;
1176     const enum AVPixelFormat *pix_fmts;
1177
1178     if (CONFIG_GRAY && (avctx->flags & AV_CODEC_FLAG_GRAY))
1179         return AV_PIX_FMT_GRAY8;
1180
1181     if (s->chroma_format < 2)
1182         pix_fmts = avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO ?
1183                                 mpeg1_hwaccel_pixfmt_list_420 :
1184                                 mpeg2_hwaccel_pixfmt_list_420;
1185     else if (s->chroma_format == 2)
1186         pix_fmts = mpeg12_pixfmt_list_422;
1187     else
1188         pix_fmts = mpeg12_pixfmt_list_444;
1189
1190     return ff_thread_get_format(avctx, pix_fmts);
1191 }
1192
1193 static void setup_hwaccel_for_pixfmt(AVCodecContext *avctx)
1194 {
1195     // until then pix_fmt may be changed right after codec init
1196     if (avctx->hwaccel)
1197         if (avctx->idct_algo == FF_IDCT_AUTO)
1198             avctx->idct_algo = FF_IDCT_NONE;
1199
1200     if (avctx->hwaccel && avctx->pix_fmt == AV_PIX_FMT_XVMC) {
1201         Mpeg1Context *s1 = avctx->priv_data;
1202         MpegEncContext *s = &s1->mpeg_enc_ctx;
1203
1204         s->pack_pblocks = 1;
1205     }
1206 }
1207
1208 /* Call this function when we know all parameters.
1209  * It may be called in different places for MPEG-1 and MPEG-2. */
1210 static int mpeg_decode_postinit(AVCodecContext *avctx)
1211 {
1212     Mpeg1Context *s1  = avctx->priv_data;
1213     MpegEncContext *s = &s1->mpeg_enc_ctx;
1214     uint8_t old_permutation[64];
1215     int ret;
1216
1217     if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1218         // MPEG-1 aspect
1219         AVRational aspect_inv = av_d2q(ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1220         avctx->sample_aspect_ratio = (AVRational) { aspect_inv.den, aspect_inv.num };
1221     } else { // MPEG-2
1222         // MPEG-2 aspect
1223         if (s->aspect_ratio_info > 1) {
1224             AVRational dar =
1225                 av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1226                                   (AVRational) { s1->pan_scan.width,
1227                                                  s1->pan_scan.height }),
1228                          (AVRational) { s->width, s->height });
1229
1230             /* We ignore the spec here and guess a bit as reality does not
1231              * match the spec, see for example res_change_ffmpeg_aspect.ts
1232              * and sequence-display-aspect.mpg.
1233              * issue1613, 621, 562 */
1234             if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1235                 (av_cmp_q(dar, (AVRational) { 4, 3 }) &&
1236                  av_cmp_q(dar, (AVRational) { 16, 9 }))) {
1237                 s->avctx->sample_aspect_ratio =
1238                     av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1239                              (AVRational) { s->width, s->height });
1240             } else {
1241                 s->avctx->sample_aspect_ratio =
1242                     av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1243                              (AVRational) { s1->pan_scan.width, s1->pan_scan.height });
1244 // issue1613 4/3 16/9 -> 16/9
1245 // res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1246 // widescreen-issue562.mpg 4/3 16/9 -> 16/9
1247 //                s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1248                 ff_dlog(avctx, "aspect A %d/%d\n",
1249                         ff_mpeg2_aspect[s->aspect_ratio_info].num,
1250                         ff_mpeg2_aspect[s->aspect_ratio_info].den);
1251                 ff_dlog(avctx, "aspect B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1252                         s->avctx->sample_aspect_ratio.den);
1253             }
1254         } else {
1255             s->avctx->sample_aspect_ratio =
1256                 ff_mpeg2_aspect[s->aspect_ratio_info];
1257         }
1258     } // MPEG-2
1259
1260     if (av_image_check_sar(s->width, s->height,
1261                            avctx->sample_aspect_ratio) < 0) {
1262         av_log(avctx, AV_LOG_WARNING, "ignoring invalid SAR: %u/%u\n",
1263                 avctx->sample_aspect_ratio.num,
1264                 avctx->sample_aspect_ratio.den);
1265         avctx->sample_aspect_ratio = (AVRational){ 0, 1 };
1266     }
1267
1268     if ((s1->mpeg_enc_ctx_allocated == 0)                   ||
1269         avctx->coded_width       != s->width                ||
1270         avctx->coded_height      != s->height               ||
1271         s1->save_width           != s->width                ||
1272         s1->save_height          != s->height               ||
1273         av_cmp_q(s1->save_aspect, s->avctx->sample_aspect_ratio) ||
1274         (s1->save_progressive_seq != s->progressive_sequence && FFALIGN(s->height, 16) != FFALIGN(s->height, 32)) ||
1275         0) {
1276         if (s1->mpeg_enc_ctx_allocated) {
1277             ParseContext pc = s->parse_context;
1278             s->parse_context.buffer = 0;
1279             ff_mpv_common_end(s);
1280             s->parse_context = pc;
1281             s1->mpeg_enc_ctx_allocated = 0;
1282         }
1283
1284         ret = ff_set_dimensions(avctx, s->width, s->height);
1285         if (ret < 0)
1286             return ret;
1287
1288         if (avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->bit_rate) {
1289             avctx->rc_max_rate = s->bit_rate;
1290         } else if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && s->bit_rate &&
1291                    (s->bit_rate != 0x3FFFF*400 || s->vbv_delay != 0xFFFF)) {
1292             avctx->bit_rate = s->bit_rate;
1293         }
1294         s1->save_aspect          = s->avctx->sample_aspect_ratio;
1295         s1->save_width           = s->width;
1296         s1->save_height          = s->height;
1297         s1->save_progressive_seq = s->progressive_sequence;
1298
1299         /* low_delay may be forced, in this case we will have B-frames
1300          * that behave like P-frames. */
1301         avctx->has_b_frames = !s->low_delay;
1302
1303         if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1304             // MPEG-1 fps
1305             avctx->framerate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
1306             avctx->ticks_per_frame     = 1;
1307
1308             avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1309         } else { // MPEG-2
1310             // MPEG-2 fps
1311             av_reduce(&s->avctx->framerate.num,
1312                       &s->avctx->framerate.den,
1313                       ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
1314                       ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1315                       1 << 30);
1316             avctx->ticks_per_frame = 2;
1317
1318             switch (s->chroma_format) {
1319             case 1: avctx->chroma_sample_location = AVCHROMA_LOC_LEFT; break;
1320             case 2:
1321             case 3: avctx->chroma_sample_location = AVCHROMA_LOC_TOPLEFT; break;
1322             default: av_assert0(0);
1323             }
1324         } // MPEG-2
1325
1326         avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1327         setup_hwaccel_for_pixfmt(avctx);
1328
1329         /* Quantization matrices may need reordering
1330          * if DCT permutation is changed. */
1331         memcpy(old_permutation, s->idsp.idct_permutation, 64 * sizeof(uint8_t));
1332
1333         ff_mpv_idct_init(s);
1334         if ((ret = ff_mpv_common_init(s)) < 0)
1335             return ret;
1336
1337         quant_matrix_rebuild(s->intra_matrix,        old_permutation, s->idsp.idct_permutation);
1338         quant_matrix_rebuild(s->inter_matrix,        old_permutation, s->idsp.idct_permutation);
1339         quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->idsp.idct_permutation);
1340         quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->idsp.idct_permutation);
1341
1342         s1->mpeg_enc_ctx_allocated = 1;
1343     }
1344     return 0;
1345 }
1346
1347 static int mpeg1_decode_picture(AVCodecContext *avctx, const uint8_t *buf,
1348                                 int buf_size)
1349 {
1350     Mpeg1Context *s1  = avctx->priv_data;
1351     MpegEncContext *s = &s1->mpeg_enc_ctx;
1352     int ref, f_code, vbv_delay;
1353
1354     init_get_bits(&s->gb, buf, buf_size * 8);
1355
1356     ref = get_bits(&s->gb, 10); /* temporal ref */
1357     s->pict_type = get_bits(&s->gb, 3);
1358     if (s->pict_type == 0 || s->pict_type > 3)
1359         return AVERROR_INVALIDDATA;
1360
1361     vbv_delay = get_bits(&s->gb, 16);
1362     s->vbv_delay = vbv_delay;
1363     if (s->pict_type == AV_PICTURE_TYPE_P ||
1364         s->pict_type == AV_PICTURE_TYPE_B) {
1365         s->full_pel[0] = get_bits1(&s->gb);
1366         f_code = get_bits(&s->gb, 3);
1367         if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1368             return AVERROR_INVALIDDATA;
1369         f_code += !f_code;
1370         s->mpeg_f_code[0][0] = f_code;
1371         s->mpeg_f_code[0][1] = f_code;
1372     }
1373     if (s->pict_type == AV_PICTURE_TYPE_B) {
1374         s->full_pel[1] = get_bits1(&s->gb);
1375         f_code = get_bits(&s->gb, 3);
1376         if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1377             return AVERROR_INVALIDDATA;
1378         f_code += !f_code;
1379         s->mpeg_f_code[1][0] = f_code;
1380         s->mpeg_f_code[1][1] = f_code;
1381     }
1382     s->current_picture.f->pict_type = s->pict_type;
1383     s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1384
1385     if (avctx->debug & FF_DEBUG_PICT_INFO)
1386         av_log(avctx, AV_LOG_DEBUG,
1387                "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1388
1389     s->y_dc_scale = 8;
1390     s->c_dc_scale = 8;
1391     return 0;
1392 }
1393
1394 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1395 {
1396     MpegEncContext *s = &s1->mpeg_enc_ctx;
1397     int horiz_size_ext, vert_size_ext;
1398     int bit_rate_ext;
1399     AVCPBProperties *cpb_props;
1400
1401     skip_bits(&s->gb, 1); /* profile and level esc*/
1402     s->avctx->profile       = get_bits(&s->gb, 3);
1403     s->avctx->level         = get_bits(&s->gb, 4);
1404     s->progressive_sequence = get_bits1(&s->gb);   /* progressive_sequence */
1405     s->chroma_format        = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1406
1407     if (!s->chroma_format) {
1408         s->chroma_format = 1;
1409         av_log(s->avctx, AV_LOG_WARNING, "Chroma format invalid\n");
1410     }
1411
1412     horiz_size_ext          = get_bits(&s->gb, 2);
1413     vert_size_ext           = get_bits(&s->gb, 2);
1414     s->width  |= (horiz_size_ext << 12);
1415     s->height |= (vert_size_ext  << 12);
1416     bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1417     s->bit_rate += (bit_rate_ext << 18) * 400LL;
1418     check_marker(s->avctx, &s->gb, "after bit rate extension");
1419     s1->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1420
1421     s->low_delay = get_bits1(&s->gb);
1422     if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
1423         s->low_delay = 1;
1424
1425     s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1426     s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1427
1428     ff_dlog(s->avctx, "sequence extension\n");
1429     s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1430
1431     if (cpb_props = ff_add_cpb_side_data(s->avctx)) {
1432         cpb_props->buffer_size = s1->rc_buffer_size;
1433         if (s->bit_rate != 0x3FFFF*400)
1434             cpb_props->max_bitrate = s->bit_rate;
1435     }
1436
1437     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1438         av_log(s->avctx, AV_LOG_DEBUG,
1439                "profile: %d, level: %d ps: %d cf:%d vbv buffer: %d, bitrate:%"PRId64"\n",
1440                s->avctx->profile, s->avctx->level, s->progressive_sequence, s->chroma_format,
1441                s1->rc_buffer_size, s->bit_rate);
1442 }
1443
1444 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1445 {
1446     MpegEncContext *s = &s1->mpeg_enc_ctx;
1447     int color_description, w, h;
1448
1449     skip_bits(&s->gb, 3); /* video format */
1450     color_description = get_bits1(&s->gb);
1451     if (color_description) {
1452         s->avctx->color_primaries = get_bits(&s->gb, 8);
1453         s->avctx->color_trc       = get_bits(&s->gb, 8);
1454         s->avctx->colorspace      = get_bits(&s->gb, 8);
1455     }
1456     w = get_bits(&s->gb, 14);
1457     skip_bits(&s->gb, 1); // marker
1458     h = get_bits(&s->gb, 14);
1459     // remaining 3 bits are zero padding
1460
1461     s1->pan_scan.width  = 16 * w;
1462     s1->pan_scan.height = 16 * h;
1463
1464     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1465         av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1466 }
1467
1468 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1469 {
1470     MpegEncContext *s = &s1->mpeg_enc_ctx;
1471     int i, nofco;
1472
1473     nofco = 1;
1474     if (s->progressive_sequence) {
1475         if (s->repeat_first_field) {
1476             nofco++;
1477             if (s->top_field_first)
1478                 nofco++;
1479         }
1480     } else {
1481         if (s->picture_structure == PICT_FRAME) {
1482             nofco++;
1483             if (s->repeat_first_field)
1484                 nofco++;
1485         }
1486     }
1487     for (i = 0; i < nofco; i++) {
1488         s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1489         skip_bits(&s->gb, 1); // marker
1490         s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1491         skip_bits(&s->gb, 1); // marker
1492     }
1493
1494     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1495         av_log(s->avctx, AV_LOG_DEBUG,
1496                "pde (%"PRId16",%"PRId16") (%"PRId16",%"PRId16") (%"PRId16",%"PRId16")\n",
1497                s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1498                s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1499                s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1500 }
1501
1502 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64],
1503                        uint16_t matrix1[64], int intra)
1504 {
1505     int i;
1506
1507     for (i = 0; i < 64; i++) {
1508         int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1509         int v = get_bits(&s->gb, 8);
1510         if (v == 0) {
1511             av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1512             return AVERROR_INVALIDDATA;
1513         }
1514         if (intra && i == 0 && v != 8) {
1515             av_log(s->avctx, AV_LOG_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v);
1516             v = 8; // needed by pink.mpg / issue1046
1517         }
1518         matrix0[j] = v;
1519         if (matrix1)
1520             matrix1[j] = v;
1521     }
1522     return 0;
1523 }
1524
1525 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1526 {
1527     ff_dlog(s->avctx, "matrix extension\n");
1528
1529     if (get_bits1(&s->gb))
1530         load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1531     if (get_bits1(&s->gb))
1532         load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1533     if (get_bits1(&s->gb))
1534         load_matrix(s, s->chroma_intra_matrix, NULL, 1);
1535     if (get_bits1(&s->gb))
1536         load_matrix(s, s->chroma_inter_matrix, NULL, 0);
1537 }
1538
1539 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1540 {
1541     MpegEncContext *s = &s1->mpeg_enc_ctx;
1542
1543     s->full_pel[0]       = s->full_pel[1] = 0;
1544     s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1545     s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1546     s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1547     s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1548     if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1549         av_log(s->avctx, AV_LOG_ERROR,
1550                "Missing picture start code, guessing missing values\n");
1551         if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1552             if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1553                 s->pict_type = AV_PICTURE_TYPE_I;
1554             else
1555                 s->pict_type = AV_PICTURE_TYPE_P;
1556         } else
1557             s->pict_type = AV_PICTURE_TYPE_B;
1558         s->current_picture.f->pict_type = s->pict_type;
1559         s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1560     }
1561     s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0];
1562     s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1];
1563     s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0];
1564     s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1];
1565
1566     s->intra_dc_precision         = get_bits(&s->gb, 2);
1567     s->picture_structure          = get_bits(&s->gb, 2);
1568     s->top_field_first            = get_bits1(&s->gb);
1569     s->frame_pred_frame_dct       = get_bits1(&s->gb);
1570     s->concealment_motion_vectors = get_bits1(&s->gb);
1571     s->q_scale_type               = get_bits1(&s->gb);
1572     s->intra_vlc_format           = get_bits1(&s->gb);
1573     s->alternate_scan             = get_bits1(&s->gb);
1574     s->repeat_first_field         = get_bits1(&s->gb);
1575     s->chroma_420_type            = get_bits1(&s->gb);
1576     s->progressive_frame          = get_bits1(&s->gb);
1577
1578     if (s->alternate_scan) {
1579         ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1580         ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1581     } else {
1582         ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1583         ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1584     }
1585
1586     /* composite display not parsed */
1587     ff_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1588     ff_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1589     ff_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1590     ff_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1591     ff_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1592     ff_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1593     ff_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1594     ff_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1595     ff_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1596 }
1597
1598 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1599 {
1600     AVCodecContext *avctx = s->avctx;
1601     Mpeg1Context *s1      = (Mpeg1Context *) s;
1602     int ret;
1603
1604     if (!(avctx->flags2 & AV_CODEC_FLAG2_CHUNKS)) {
1605         if (s->mb_width * s->mb_height * 11LL / (33 * 2 * 8) > buf_size)
1606             return AVERROR_INVALIDDATA;
1607     }
1608
1609     /* start frame decoding */
1610     if (s->first_field || s->picture_structure == PICT_FRAME) {
1611         AVFrameSideData *pan_scan;
1612
1613         if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
1614             return ret;
1615
1616         ff_mpeg_er_frame_start(s);
1617
1618         /* first check if we must repeat the frame */
1619         s->current_picture_ptr->f->repeat_pict = 0;
1620         if (s->repeat_first_field) {
1621             if (s->progressive_sequence) {
1622                 if (s->top_field_first)
1623                     s->current_picture_ptr->f->repeat_pict = 4;
1624                 else
1625                     s->current_picture_ptr->f->repeat_pict = 2;
1626             } else if (s->progressive_frame) {
1627                 s->current_picture_ptr->f->repeat_pict = 1;
1628             }
1629         }
1630
1631         pan_scan = av_frame_new_side_data(s->current_picture_ptr->f,
1632                                           AV_FRAME_DATA_PANSCAN,
1633                                           sizeof(s1->pan_scan));
1634         if (!pan_scan)
1635             return AVERROR(ENOMEM);
1636         memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
1637
1638         if (s1->a53_caption) {
1639             AVFrameSideData *sd = av_frame_new_side_data(
1640                 s->current_picture_ptr->f, AV_FRAME_DATA_A53_CC,
1641                 s1->a53_caption_size);
1642             if (sd)
1643                 memcpy(sd->data, s1->a53_caption, s1->a53_caption_size);
1644             av_freep(&s1->a53_caption);
1645         }
1646
1647         if (s1->has_stereo3d) {
1648             AVStereo3D *stereo = av_stereo3d_create_side_data(s->current_picture_ptr->f);
1649             if (!stereo)
1650                 return AVERROR(ENOMEM);
1651
1652             *stereo = s1->stereo3d;
1653             s1->has_stereo3d = 0;
1654         }
1655
1656         if (s1->has_afd) {
1657             AVFrameSideData *sd =
1658                 av_frame_new_side_data(s->current_picture_ptr->f,
1659                                        AV_FRAME_DATA_AFD, 1);
1660             if (!sd)
1661                 return AVERROR(ENOMEM);
1662
1663             *sd->data   = s1->afd;
1664             s1->has_afd = 0;
1665         }
1666
1667         if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1668             ff_thread_finish_setup(avctx);
1669     } else { // second field
1670         int i;
1671
1672         if (!s->current_picture_ptr) {
1673             av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1674             return AVERROR_INVALIDDATA;
1675         }
1676
1677         if (s->avctx->hwaccel) {
1678             if ((ret = s->avctx->hwaccel->end_frame(s->avctx)) < 0) {
1679                 av_log(avctx, AV_LOG_ERROR,
1680                        "hardware accelerator failed to decode first field\n");
1681                 return ret;
1682             }
1683         }
1684
1685         for (i = 0; i < 4; i++) {
1686             s->current_picture.f->data[i] = s->current_picture_ptr->f->data[i];
1687             if (s->picture_structure == PICT_BOTTOM_FIELD)
1688                 s->current_picture.f->data[i] +=
1689                     s->current_picture_ptr->f->linesize[i];
1690         }
1691     }
1692
1693     if (avctx->hwaccel) {
1694         if ((ret = avctx->hwaccel->start_frame(avctx, buf, buf_size)) < 0)
1695             return ret;
1696     }
1697
1698     return 0;
1699 }
1700
1701 #define DECODE_SLICE_ERROR -1
1702 #define DECODE_SLICE_OK     0
1703
1704 /**
1705  * Decode a slice.
1706  * MpegEncContext.mb_y must be set to the MB row from the startcode.
1707  * @return DECODE_SLICE_ERROR if the slice is damaged,
1708  *         DECODE_SLICE_OK if this slice is OK
1709  */
1710 static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1711                              const uint8_t **buf, int buf_size)
1712 {
1713     AVCodecContext *avctx = s->avctx;
1714     const int lowres      = s->avctx->lowres;
1715     const int field_pic   = s->picture_structure != PICT_FRAME;
1716     int ret;
1717
1718     s->resync_mb_x =
1719     s->resync_mb_y = -1;
1720
1721     av_assert0(mb_y < s->mb_height);
1722
1723     init_get_bits(&s->gb, *buf, buf_size * 8);
1724     if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1725         skip_bits(&s->gb, 3);
1726
1727     ff_mpeg1_clean_buffers(s);
1728     s->interlaced_dct = 0;
1729
1730     s->qscale = mpeg_get_qscale(s);
1731
1732     if (s->qscale == 0) {
1733         av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1734         return AVERROR_INVALIDDATA;
1735     }
1736
1737     /* extra slice info */
1738     if (skip_1stop_8data_bits(&s->gb) < 0)
1739         return AVERROR_INVALIDDATA;
1740
1741     s->mb_x = 0;
1742
1743     if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1744         skip_bits1(&s->gb);
1745     } else {
1746         while (get_bits_left(&s->gb) > 0) {
1747             int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1748                                 MBINCR_VLC_BITS, 2);
1749             if (code < 0) {
1750                 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1751                 return AVERROR_INVALIDDATA;
1752             }
1753             if (code >= 33) {
1754                 if (code == 33)
1755                     s->mb_x += 33;
1756                 /* otherwise, stuffing, nothing to do */
1757             } else {
1758                 s->mb_x += code;
1759                 break;
1760             }
1761         }
1762     }
1763
1764     if (s->mb_x >= (unsigned) s->mb_width) {
1765         av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1766         return AVERROR_INVALIDDATA;
1767     }
1768
1769     if (avctx->hwaccel && avctx->hwaccel->decode_slice) {
1770         const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1771         int start_code = -1;
1772         buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1773         if (buf_end < *buf + buf_size)
1774             buf_end -= 4;
1775         s->mb_y = mb_y;
1776         if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1777             return DECODE_SLICE_ERROR;
1778         *buf = buf_end;
1779         return DECODE_SLICE_OK;
1780     }
1781
1782     s->resync_mb_x = s->mb_x;
1783     s->resync_mb_y = s->mb_y = mb_y;
1784     s->mb_skip_run = 0;
1785     ff_init_block_index(s);
1786
1787     if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1788         if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1789             av_log(s->avctx, AV_LOG_DEBUG,
1790                    "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",
1791                    s->qscale,
1792                    s->mpeg_f_code[0][0], s->mpeg_f_code[0][1],
1793                    s->mpeg_f_code[1][0], s->mpeg_f_code[1][1],
1794                    s->pict_type  == AV_PICTURE_TYPE_I ? "I" :
1795                    (s->pict_type == AV_PICTURE_TYPE_P ? "P" :
1796                    (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
1797                    s->progressive_sequence ? "ps"  : "",
1798                    s->progressive_frame    ? "pf"  : "",
1799                    s->alternate_scan       ? "alt" : "",
1800                    s->top_field_first      ? "top" : "",
1801                    s->intra_dc_precision, s->picture_structure,
1802                    s->frame_pred_frame_dct, s->concealment_motion_vectors,
1803                    s->q_scale_type, s->intra_vlc_format,
1804                    s->repeat_first_field, s->chroma_420_type ? "420" : "");
1805         }
1806     }
1807
1808     for (;;) {
1809         // If 1, we memcpy blocks in xvmcvideo.
1810         if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1811             ff_xvmc_init_block(s); // set s->block
1812
1813         if ((ret = mpeg_decode_mb(s, s->block)) < 0)
1814             return ret;
1815
1816         // Note motion_val is normally NULL unless we want to extract the MVs.
1817         if (s->current_picture.motion_val[0] && !s->encoding) {
1818             const int wrap = s->b8_stride;
1819             int xy         = s->mb_x * 2 + s->mb_y * 2 * wrap;
1820             int b8_xy      = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1821             int motion_x, motion_y, dir, i;
1822
1823             for (i = 0; i < 2; i++) {
1824                 for (dir = 0; dir < 2; dir++) {
1825                     if (s->mb_intra ||
1826                         (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1827                         motion_x = motion_y = 0;
1828                     } else if (s->mv_type == MV_TYPE_16X16 ||
1829                                (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1830                         motion_x = s->mv[dir][0][0];
1831                         motion_y = s->mv[dir][0][1];
1832                     } else { /* if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8)) */
1833                         motion_x = s->mv[dir][i][0];
1834                         motion_y = s->mv[dir][i][1];
1835                     }
1836
1837                     s->current_picture.motion_val[dir][xy][0]     = motion_x;
1838                     s->current_picture.motion_val[dir][xy][1]     = motion_y;
1839                     s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1840                     s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1841                     s->current_picture.ref_index [dir][b8_xy]     =
1842                     s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1843                     av_assert2(s->field_select[dir][i] == 0 ||
1844                                s->field_select[dir][i] == 1);
1845                 }
1846                 xy    += wrap;
1847                 b8_xy += 2;
1848             }
1849         }
1850
1851         s->dest[0] += 16 >> lowres;
1852         s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1853         s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1854
1855         ff_mpv_reconstruct_mb(s, s->block);
1856
1857         if (++s->mb_x >= s->mb_width) {
1858             const int mb_size = 16 >> s->avctx->lowres;
1859             int left;
1860
1861             ff_mpeg_draw_horiz_band(s, mb_size * (s->mb_y >> field_pic), mb_size);
1862             ff_mpv_report_decode_progress(s);
1863
1864             s->mb_x  = 0;
1865             s->mb_y += 1 << field_pic;
1866
1867             if (s->mb_y >= s->mb_height) {
1868                 int left   = get_bits_left(&s->gb);
1869                 int is_d10 = s->chroma_format == 2 &&
1870                              s->pict_type == AV_PICTURE_TYPE_I &&
1871                              avctx->profile == 0 && avctx->level == 5 &&
1872                              s->intra_dc_precision == 2 &&
1873                              s->q_scale_type == 1 && s->alternate_scan == 0 &&
1874                              s->progressive_frame == 0
1875                              /* vbv_delay == 0xBBB || 0xE10 */;
1876
1877                 if (left >= 32 && !is_d10) {
1878                     GetBitContext gb = s->gb;
1879                     align_get_bits(&gb);
1880                     if (show_bits(&gb, 24) == 0x060E2B) {
1881                         av_log(avctx, AV_LOG_DEBUG, "Invalid MXF data found in video stream\n");
1882                         is_d10 = 1;
1883                     }
1884                     if (left > 32 && show_bits_long(&gb, 32) == 0x201) {
1885                         av_log(avctx, AV_LOG_DEBUG, "skipping m704 alpha (unsupported)\n");
1886                         goto eos;
1887                     }
1888                 }
1889
1890                 if (left < 0 ||
1891                     (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10) ||
1892                     ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
1893                     av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X at %d %d\n",
1894                            left, left>0 ? show_bits(&s->gb, FFMIN(left, 23)) : 0, s->mb_x, s->mb_y);
1895                     return AVERROR_INVALIDDATA;
1896                 } else
1897                     goto eos;
1898             }
1899             // There are some files out there which are missing the last slice
1900             // in cases where the slice is completely outside the visible
1901             // area, we detect this here instead of running into the end expecting
1902             // more data
1903             left = get_bits_left(&s->gb);
1904             if (s->mb_y >= ((s->height + 15) >> 4) &&
1905                 !s->progressive_sequence &&
1906                 left <= 25 &&
1907                 left >= 0 &&
1908                 s->mb_skip_run == -1 &&
1909                 (!left || show_bits(&s->gb, left) == 0))
1910                 goto eos;
1911
1912             ff_init_block_index(s);
1913         }
1914
1915         /* skip mb handling */
1916         if (s->mb_skip_run == -1) {
1917             /* read increment again */
1918             s->mb_skip_run = 0;
1919             for (;;) {
1920                 int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1921                                     MBINCR_VLC_BITS, 2);
1922                 if (code < 0) {
1923                     av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1924                     return AVERROR_INVALIDDATA;
1925                 }
1926                 if (code >= 33) {
1927                     if (code == 33) {
1928                         s->mb_skip_run += 33;
1929                     } else if (code == 35) {
1930                         if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1931                             av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1932                             return AVERROR_INVALIDDATA;
1933                         }
1934                         goto eos; /* end of slice */
1935                     }
1936                     /* otherwise, stuffing, nothing to do */
1937                 } else {
1938                     s->mb_skip_run += code;
1939                     break;
1940                 }
1941             }
1942             if (s->mb_skip_run) {
1943                 int i;
1944                 if (s->pict_type == AV_PICTURE_TYPE_I) {
1945                     av_log(s->avctx, AV_LOG_ERROR,
1946                            "skipped MB in I-frame at %d %d\n", s->mb_x, s->mb_y);
1947                     return AVERROR_INVALIDDATA;
1948                 }
1949
1950                 /* skip mb */
1951                 s->mb_intra = 0;
1952                 for (i = 0; i < 12; i++)
1953                     s->block_last_index[i] = -1;
1954                 if (s->picture_structure == PICT_FRAME)
1955                     s->mv_type = MV_TYPE_16X16;
1956                 else
1957                     s->mv_type = MV_TYPE_FIELD;
1958                 if (s->pict_type == AV_PICTURE_TYPE_P) {
1959                     /* if P type, zero motion vector is implied */
1960                     s->mv_dir             = MV_DIR_FORWARD;
1961                     s->mv[0][0][0]        = s->mv[0][0][1]      = 0;
1962                     s->last_mv[0][0][0]   = s->last_mv[0][0][1] = 0;
1963                     s->last_mv[0][1][0]   = s->last_mv[0][1][1] = 0;
1964                     s->field_select[0][0] = (s->picture_structure - 1) & 1;
1965                 } else {
1966                     /* if B type, reuse previous vectors and directions */
1967                     s->mv[0][0][0] = s->last_mv[0][0][0];
1968                     s->mv[0][0][1] = s->last_mv[0][0][1];
1969                     s->mv[1][0][0] = s->last_mv[1][0][0];
1970                     s->mv[1][0][1] = s->last_mv[1][0][1];
1971                     s->field_select[0][0] = (s->picture_structure - 1) & 1;
1972                     s->field_select[1][0] = (s->picture_structure - 1) & 1;
1973                 }
1974             }
1975         }
1976     }
1977 eos: // end of slice
1978     if (get_bits_left(&s->gb) < 0) {
1979         av_log(s, AV_LOG_ERROR, "overread %d\n", -get_bits_left(&s->gb));
1980         return AVERROR_INVALIDDATA;
1981     }
1982     *buf += (get_bits_count(&s->gb) - 1) / 8;
1983     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);
1984     return 0;
1985 }
1986
1987 static int slice_decode_thread(AVCodecContext *c, void *arg)
1988 {
1989     MpegEncContext *s   = *(void **) arg;
1990     const uint8_t *buf  = s->gb.buffer;
1991     int mb_y            = s->start_mb_y;
1992     const int field_pic = s->picture_structure != PICT_FRAME;
1993
1994     s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
1995
1996     for (;;) {
1997         uint32_t start_code;
1998         int ret;
1999
2000         ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
2001         emms_c();
2002         ff_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
2003                 ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
2004                 s->start_mb_y, s->end_mb_y, s->er.error_count);
2005         if (ret < 0) {
2006             if (c->err_recognition & AV_EF_EXPLODE)
2007                 return ret;
2008             if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
2009                 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2010                                 s->mb_x, s->mb_y,
2011                                 ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2012         } else {
2013             ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2014                             s->mb_x - 1, s->mb_y,
2015                             ER_AC_END | ER_DC_END | ER_MV_END);
2016         }
2017
2018         if (s->mb_y == s->end_mb_y)
2019             return 0;
2020
2021         start_code = -1;
2022         buf        = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
2023         if (start_code < SLICE_MIN_START_CODE || start_code > SLICE_MAX_START_CODE)
2024             return AVERROR_INVALIDDATA;
2025         mb_y       = start_code - SLICE_MIN_START_CODE;
2026         if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
2027             mb_y += (*buf&0xE0)<<2;
2028         mb_y <<= field_pic;
2029         if (s->picture_structure == PICT_BOTTOM_FIELD)
2030             mb_y++;
2031         if (mb_y >= s->end_mb_y)
2032             return AVERROR_INVALIDDATA;
2033     }
2034 }
2035
2036 /**
2037  * Handle slice ends.
2038  * @return 1 if it seems to be the last slice
2039  */
2040 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2041 {
2042     Mpeg1Context *s1  = avctx->priv_data;
2043     MpegEncContext *s = &s1->mpeg_enc_ctx;
2044
2045     if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2046         return 0;
2047
2048     if (s->avctx->hwaccel) {
2049         int ret = s->avctx->hwaccel->end_frame(s->avctx);
2050         if (ret < 0) {
2051             av_log(avctx, AV_LOG_ERROR,
2052                    "hardware accelerator failed to decode picture\n");
2053             return ret;
2054         }
2055     }
2056
2057     /* end of slice reached */
2058     if (/* s->mb_y << field_pic == s->mb_height && */ !s->first_field && !s1->first_slice) {
2059         /* end of image */
2060
2061         ff_er_frame_end(&s->er);
2062
2063         ff_mpv_frame_end(s);
2064
2065         if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
2066             int ret = av_frame_ref(pict, s->current_picture_ptr->f);
2067             if (ret < 0)
2068                 return ret;
2069             ff_print_debug_info(s, s->current_picture_ptr, pict);
2070             ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2071         } else {
2072             if (avctx->active_thread_type & FF_THREAD_FRAME)
2073                 s->picture_number++;
2074             /* latency of 1 frame for I- and P-frames */
2075             /* XXX: use another variable than picture_number */
2076             if (s->last_picture_ptr) {
2077                 int ret = av_frame_ref(pict, s->last_picture_ptr->f);
2078                 if (ret < 0)
2079                     return ret;
2080                 ff_print_debug_info(s, s->last_picture_ptr, pict);
2081                 ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2082             }
2083         }
2084
2085         return 1;
2086     } else {
2087         return 0;
2088     }
2089 }
2090
2091 static int mpeg1_decode_sequence(AVCodecContext *avctx,
2092                                  const uint8_t *buf, int buf_size)
2093 {
2094     Mpeg1Context *s1  = avctx->priv_data;
2095     MpegEncContext *s = &s1->mpeg_enc_ctx;
2096     int width, height;
2097     int i, v, j;
2098
2099     init_get_bits(&s->gb, buf, buf_size * 8);
2100
2101     width  = get_bits(&s->gb, 12);
2102     height = get_bits(&s->gb, 12);
2103     if (width == 0 || height == 0) {
2104         av_log(avctx, AV_LOG_WARNING,
2105                "Invalid horizontal or vertical size value.\n");
2106         if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2107             return AVERROR_INVALIDDATA;
2108     }
2109     s->aspect_ratio_info = get_bits(&s->gb, 4);
2110     if (s->aspect_ratio_info == 0) {
2111         av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2112         if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2113             return AVERROR_INVALIDDATA;
2114     }
2115     s->frame_rate_index = get_bits(&s->gb, 4);
2116     if (s->frame_rate_index == 0 || s->frame_rate_index > 13) {
2117         av_log(avctx, AV_LOG_WARNING,
2118                "frame_rate_index %d is invalid\n", s->frame_rate_index);
2119         s->frame_rate_index = 1;
2120     }
2121     s->bit_rate = get_bits(&s->gb, 18) * 400LL;
2122     if (check_marker(s->avctx, &s->gb, "in sequence header") == 0) {
2123         return AVERROR_INVALIDDATA;
2124     }
2125
2126     s1->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2127     skip_bits(&s->gb, 1);
2128
2129     /* get matrix */
2130     if (get_bits1(&s->gb)) {
2131         load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2132     } else {
2133         for (i = 0; i < 64; i++) {
2134             j = s->idsp.idct_permutation[i];
2135             v = ff_mpeg1_default_intra_matrix[i];
2136             s->intra_matrix[j]        = v;
2137             s->chroma_intra_matrix[j] = v;
2138         }
2139     }
2140     if (get_bits1(&s->gb)) {
2141         load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2142     } else {
2143         for (i = 0; i < 64; i++) {
2144             int j = s->idsp.idct_permutation[i];
2145             v = ff_mpeg1_default_non_intra_matrix[i];
2146             s->inter_matrix[j]        = v;
2147             s->chroma_inter_matrix[j] = v;
2148         }
2149     }
2150
2151     if (show_bits(&s->gb, 23) != 0) {
2152         av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2153         return AVERROR_INVALIDDATA;
2154     }
2155
2156     s->width  = width;
2157     s->height = height;
2158
2159     /* We set MPEG-2 parameters so that it emulates MPEG-1. */
2160     s->progressive_sequence = 1;
2161     s->progressive_frame    = 1;
2162     s->picture_structure    = PICT_FRAME;
2163     s->first_field          = 0;
2164     s->frame_pred_frame_dct = 1;
2165     s->chroma_format        = 1;
2166     s->codec_id             =
2167     s->avctx->codec_id      = AV_CODEC_ID_MPEG1VIDEO;
2168     s->out_format           = FMT_MPEG1;
2169     s->swap_uv              = 0; // AFAIK VCR2 does not have SEQ_HEADER
2170     if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
2171         s->low_delay = 1;
2172
2173     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2174         av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%"PRId64", aspect_ratio_info: %d \n",
2175                s1->rc_buffer_size, s->bit_rate, s->aspect_ratio_info);
2176
2177     return 0;
2178 }
2179
2180 static int vcr2_init_sequence(AVCodecContext *avctx)
2181 {
2182     Mpeg1Context *s1  = avctx->priv_data;
2183     MpegEncContext *s = &s1->mpeg_enc_ctx;
2184     int i, v, ret;
2185
2186     /* start new MPEG-1 context decoding */
2187     s->out_format = FMT_MPEG1;
2188     if (s1->mpeg_enc_ctx_allocated) {
2189         ff_mpv_common_end(s);
2190         s1->mpeg_enc_ctx_allocated = 0;
2191     }
2192     s->width            = avctx->coded_width;
2193     s->height           = avctx->coded_height;
2194     avctx->has_b_frames = 0; // true?
2195     s->low_delay        = 1;
2196
2197     avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2198     setup_hwaccel_for_pixfmt(avctx);
2199
2200     ff_mpv_idct_init(s);
2201     if ((ret = ff_mpv_common_init(s)) < 0)
2202         return ret;
2203     s1->mpeg_enc_ctx_allocated = 1;
2204
2205     for (i = 0; i < 64; i++) {
2206         int j = s->idsp.idct_permutation[i];
2207         v = ff_mpeg1_default_intra_matrix[i];
2208         s->intra_matrix[j]        = v;
2209         s->chroma_intra_matrix[j] = v;
2210
2211         v = ff_mpeg1_default_non_intra_matrix[i];
2212         s->inter_matrix[j]        = v;
2213         s->chroma_inter_matrix[j] = v;
2214     }
2215
2216     s->progressive_sequence  = 1;
2217     s->progressive_frame     = 1;
2218     s->picture_structure     = PICT_FRAME;
2219     s->first_field           = 0;
2220     s->frame_pred_frame_dct  = 1;
2221     s->chroma_format         = 1;
2222     if (s->codec_tag == AV_RL32("BW10")) {
2223         s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2224     } else {
2225         s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
2226         s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
2227     }
2228     s1->save_width           = s->width;
2229     s1->save_height          = s->height;
2230     s1->save_progressive_seq = s->progressive_sequence;
2231     return 0;
2232 }
2233
2234 static int mpeg_decode_a53_cc(AVCodecContext *avctx,
2235                               const uint8_t *p, int buf_size)
2236 {
2237     Mpeg1Context *s1 = avctx->priv_data;
2238
2239     if (buf_size >= 6 &&
2240         p[0] == 'G' && p[1] == 'A' && p[2] == '9' && p[3] == '4' &&
2241         p[4] == 3 && (p[5] & 0x40)) {
2242         /* extract A53 Part 4 CC data */
2243         int cc_count = p[5] & 0x1f;
2244         if (cc_count > 0 && buf_size >= 7 + cc_count * 3) {
2245             av_freep(&s1->a53_caption);
2246             s1->a53_caption_size = cc_count * 3;
2247             s1->a53_caption      = av_malloc(s1->a53_caption_size);
2248             if (!s1->a53_caption) {
2249                 s1->a53_caption_size = 0;
2250             } else {
2251                 memcpy(s1->a53_caption, p + 7, s1->a53_caption_size);
2252             }
2253             avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
2254         }
2255         return 1;
2256     } else if (buf_size >= 2 &&
2257                p[0] == 0x03 && (p[1]&0x7f) == 0x01) {
2258         /* extract SCTE-20 CC data */
2259         GetBitContext gb;
2260         int cc_count = 0;
2261         int i;
2262
2263         init_get_bits(&gb, p + 2, buf_size - 2);
2264         cc_count = get_bits(&gb, 5);
2265         if (cc_count > 0) {
2266             av_freep(&s1->a53_caption);
2267             s1->a53_caption_size = cc_count * 3;
2268             s1->a53_caption      = av_mallocz(s1->a53_caption_size);
2269             if (!s1->a53_caption) {
2270                 s1->a53_caption_size = 0;
2271             } else {
2272                 uint8_t field, cc1, cc2;
2273                 uint8_t *cap = s1->a53_caption;
2274                 for (i = 0; i < cc_count && get_bits_left(&gb) >= 26; i++) {
2275                     skip_bits(&gb, 2); // priority
2276                     field = get_bits(&gb, 2);
2277                     skip_bits(&gb, 5); // line_offset
2278                     cc1 = get_bits(&gb, 8);
2279                     cc2 = get_bits(&gb, 8);
2280                     skip_bits(&gb, 1); // marker
2281
2282                     if (!field) { // forbidden
2283                         cap[0] = cap[1] = cap[2] = 0x00;
2284                     } else {
2285                         field = (field == 2 ? 1 : 0);
2286                         if (!s1->mpeg_enc_ctx.top_field_first) field = !field;
2287                         cap[0] = 0x04 | field;
2288                         cap[1] = ff_reverse[cc1];
2289                         cap[2] = ff_reverse[cc2];
2290                     }
2291                     cap += 3;
2292                 }
2293             }
2294             avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
2295         }
2296         return 1;
2297     } else if (buf_size >= 11 &&
2298                p[0] == 'C' && p[1] == 'C' && p[2] == 0x01 && p[3] == 0xf8) {
2299         /* extract DVD CC data
2300          *
2301          * uint32_t   user_data_start_code        0x000001B2    (big endian)
2302          * uint16_t   user_identifier             0x4343 "CC"
2303          * uint8_t    user_data_type_code         0x01
2304          * uint8_t    caption_block_size          0xF8
2305          * uint8_t
2306          *   bit 7    caption_odd_field_first     1=odd field (CC1/CC2) first  0=even field (CC3/CC4) first
2307          *   bit 6    caption_filler              0
2308          *   bit 5:1  caption_block_count         number of caption blocks (pairs of caption words = frames). Most DVDs use 15 per start of GOP.
2309          *   bit 0    caption_extra_field_added   1=one additional caption word
2310          *
2311          * struct caption_field_block {
2312          *   uint8_t
2313          *     bit 7:1 caption_filler             0x7F (all 1s)
2314          *     bit 0   caption_field_odd          1=odd field (this is CC1/CC2)  0=even field (this is CC3/CC4)
2315          *   uint8_t   caption_first_byte
2316          *   uint8_t   caption_second_byte
2317          * } caption_block[(caption_block_count * 2) + caption_extra_field_added];
2318          *
2319          * Some DVDs encode caption data for both fields with caption_field_odd=1. The only way to decode the fields
2320          * correctly is to start on the field indicated by caption_odd_field_first and count between odd/even fields.
2321          * Don't assume that the first caption word is the odd field. There do exist MPEG files in the wild that start
2322          * on the even field. There also exist DVDs in the wild that encode an odd field count and the
2323          * caption_extra_field_added/caption_odd_field_first bits change per packet to allow that. */
2324         int cc_count = 0;
2325         int i;
2326         // There is a caption count field in the data, but it is often
2327         // incorrect.  So count the number of captions present.
2328         for (i = 5; i + 6 <= buf_size && ((p[i] & 0xfe) == 0xfe); i += 6)
2329             cc_count++;
2330         // Transform the DVD format into A53 Part 4 format
2331         if (cc_count > 0) {
2332             av_freep(&s1->a53_caption);
2333             s1->a53_caption_size = cc_count * 6;
2334             s1->a53_caption      = av_malloc(s1->a53_caption_size);
2335             if (!s1->a53_caption) {
2336                 s1->a53_caption_size = 0;
2337             } else {
2338                 uint8_t field1 = !!(p[4] & 0x80);
2339                 uint8_t *cap = s1->a53_caption;
2340                 p += 5;
2341                 for (i = 0; i < cc_count; i++) {
2342                     cap[0] = (p[0] == 0xff && field1) ? 0xfc : 0xfd;
2343                     cap[1] = p[1];
2344                     cap[2] = p[2];
2345                     cap[3] = (p[3] == 0xff && !field1) ? 0xfc : 0xfd;
2346                     cap[4] = p[4];
2347                     cap[5] = p[5];
2348                     cap += 6;
2349                     p += 6;
2350                 }
2351             }
2352             avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
2353         }
2354         return 1;
2355     }
2356     return 0;
2357 }
2358
2359 static void mpeg_decode_user_data(AVCodecContext *avctx,
2360                                   const uint8_t *p, int buf_size)
2361 {
2362     Mpeg1Context *s = avctx->priv_data;
2363     const uint8_t *buf_end = p + buf_size;
2364     Mpeg1Context *s1 = avctx->priv_data;
2365
2366 #if 0
2367     int i;
2368     for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i<buf_size; i++){
2369         av_log(avctx, AV_LOG_ERROR, "%c", p[i]);
2370     }
2371     av_log(avctx, AV_LOG_ERROR, "\n");
2372 #endif
2373
2374     if (buf_size > 29){
2375         int i;
2376         for(i=0; i<20; i++)
2377             if (!memcmp(p+i, "\0TMPGEXS\0", 9)){
2378                 s->tmpgexs= 1;
2379             }
2380     }
2381     /* we parse the DTG active format information */
2382     if (buf_end - p >= 5 &&
2383         p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2384         int flags = p[4];
2385         p += 5;
2386         if (flags & 0x80) {
2387             /* skip event id */
2388             p += 2;
2389         }
2390         if (flags & 0x40) {
2391             if (buf_end - p < 1)
2392                 return;
2393             s1->has_afd = 1;
2394             s1->afd     = p[0] & 0x0f;
2395         }
2396     } else if (buf_end - p >= 6 &&
2397                p[0] == 'J' && p[1] == 'P' && p[2] == '3' && p[3] == 'D' &&
2398                p[4] == 0x03) { // S3D_video_format_length
2399         // the 0x7F mask ignores the reserved_bit value
2400         const uint8_t S3D_video_format_type = p[5] & 0x7F;
2401
2402         if (S3D_video_format_type == 0x03 ||
2403             S3D_video_format_type == 0x04 ||
2404             S3D_video_format_type == 0x08 ||
2405             S3D_video_format_type == 0x23) {
2406
2407             s1->has_stereo3d = 1;
2408
2409             switch (S3D_video_format_type) {
2410             case 0x03:
2411                 s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE;
2412                 break;
2413             case 0x04:
2414                 s1->stereo3d.type = AV_STEREO3D_TOPBOTTOM;
2415                 break;
2416             case 0x08:
2417                 s1->stereo3d.type = AV_STEREO3D_2D;
2418                 break;
2419             case 0x23:
2420                 s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE_QUINCUNX;
2421                 break;
2422             }
2423         }
2424     } else if (mpeg_decode_a53_cc(avctx, p, buf_size)) {
2425         return;
2426     }
2427 }
2428
2429 static void mpeg_decode_gop(AVCodecContext *avctx,
2430                             const uint8_t *buf, int buf_size)
2431 {
2432     Mpeg1Context *s1  = avctx->priv_data;
2433     MpegEncContext *s = &s1->mpeg_enc_ctx;
2434     int broken_link;
2435     int64_t tc;
2436
2437     init_get_bits(&s->gb, buf, buf_size * 8);
2438
2439     tc = s-> timecode_frame_start = get_bits(&s->gb, 25);
2440
2441 #if FF_API_PRIVATE_OPT
2442 FF_DISABLE_DEPRECATION_WARNINGS
2443     avctx->timecode_frame_start = tc;
2444 FF_ENABLE_DEPRECATION_WARNINGS
2445 #endif
2446
2447     s->closed_gop = get_bits1(&s->gb);
2448     /* broken_link indicates that after editing the
2449      * reference frames of the first B-Frames after GOP I-Frame
2450      * are missing (open gop) */
2451     broken_link = get_bits1(&s->gb);
2452
2453     if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2454         char tcbuf[AV_TIMECODE_STR_SIZE];
2455         av_timecode_make_mpeg_tc_string(tcbuf, tc);
2456         av_log(s->avctx, AV_LOG_DEBUG,
2457                "GOP (%s) closed_gop=%d broken_link=%d\n",
2458                tcbuf, s->closed_gop, broken_link);
2459     }
2460 }
2461
2462 static int decode_chunks(AVCodecContext *avctx, AVFrame *picture,
2463                          int *got_output, const uint8_t *buf, int buf_size)
2464 {
2465     Mpeg1Context *s = avctx->priv_data;
2466     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2467     const uint8_t *buf_ptr = buf;
2468     const uint8_t *buf_end = buf + buf_size;
2469     int ret, input_size;
2470     int last_code = 0, skip_frame = 0;
2471     int picture_start_code_seen = 0;
2472
2473     for (;;) {
2474         /* find next start code */
2475         uint32_t start_code = -1;
2476         buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
2477         if (start_code > 0x1ff) {
2478             if (!skip_frame) {
2479                 if (HAVE_THREADS &&
2480                     (avctx->active_thread_type & FF_THREAD_SLICE) &&
2481                     !avctx->hwaccel) {
2482                     int i;
2483                     av_assert0(avctx->thread_count > 1);
2484
2485                     avctx->execute(avctx, slice_decode_thread,
2486                                    &s2->thread_context[0], NULL,
2487                                    s->slice_count, sizeof(void *));
2488                     for (i = 0; i < s->slice_count; i++)
2489                         s2->er.error_count += s2->thread_context[i]->er.error_count;
2490                 }
2491
2492                 ret = slice_end(avctx, picture);
2493                 if (ret < 0)
2494                     return ret;
2495                 else if (ret) {
2496                     // FIXME: merge with the stuff in mpeg_decode_slice
2497                     if (s2->last_picture_ptr || s2->low_delay || s2->pict_type == AV_PICTURE_TYPE_B)
2498                         *got_output = 1;
2499                 }
2500             }
2501             s2->pict_type = 0;
2502
2503             if (avctx->err_recognition & AV_EF_EXPLODE && s2->er.error_count)
2504                 return AVERROR_INVALIDDATA;
2505
2506             return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2507         }
2508
2509         input_size = buf_end - buf_ptr;
2510
2511         if (avctx->debug & FF_DEBUG_STARTCODE)
2512             av_log(avctx, AV_LOG_DEBUG, "%3"PRIX32" at %"PTRDIFF_SPECIFIER" left %d\n",
2513                    start_code, buf_ptr - buf, input_size);
2514
2515         /* prepare data for next start code */
2516         switch (start_code) {
2517         case SEQ_START_CODE:
2518             if (last_code == 0) {
2519                 mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2520                 if (buf != avctx->extradata)
2521                     s->sync = 1;
2522             } else {
2523                 av_log(avctx, AV_LOG_ERROR,
2524                        "ignoring SEQ_START_CODE after %X\n", last_code);
2525                 if (avctx->err_recognition & AV_EF_EXPLODE)
2526                     return AVERROR_INVALIDDATA;
2527             }
2528             break;
2529
2530         case PICTURE_START_CODE:
2531             if (picture_start_code_seen && s2->picture_structure == PICT_FRAME) {
2532                /* If it's a frame picture, there can't be more than one picture header.
2533                   Yet, it does happen and we need to handle it. */
2534                av_log(avctx, AV_LOG_WARNING, "ignoring extra picture following a frame-picture\n");
2535                break;
2536             }
2537             picture_start_code_seen = 1;
2538
2539             if (s2->width <= 0 || s2->height <= 0) {
2540                 av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
2541                        s2->width, s2->height);
2542                 return AVERROR_INVALIDDATA;
2543             }
2544
2545             if (s->tmpgexs){
2546                 s2->intra_dc_precision= 3;
2547                 s2->intra_matrix[0]= 1;
2548             }
2549             if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
2550                 !avctx->hwaccel && s->slice_count) {
2551                 int i;
2552
2553                 avctx->execute(avctx, slice_decode_thread,
2554                                s2->thread_context, NULL,
2555                                s->slice_count, sizeof(void *));
2556                 for (i = 0; i < s->slice_count; i++)
2557                     s2->er.error_count += s2->thread_context[i]->er.error_count;
2558                 s->slice_count = 0;
2559             }
2560             if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2561                 ret = mpeg_decode_postinit(avctx);
2562                 if (ret < 0) {
2563                     av_log(avctx, AV_LOG_ERROR,
2564                            "mpeg_decode_postinit() failure\n");
2565                     return ret;
2566                 }
2567
2568                 /* We have a complete image: we try to decompress it. */
2569                 if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2570                     s2->pict_type = 0;
2571                 s->first_slice = 1;
2572                 last_code      = PICTURE_START_CODE;
2573             } else {
2574                 av_log(avctx, AV_LOG_ERROR,
2575                        "ignoring pic after %X\n", last_code);
2576                 if (avctx->err_recognition & AV_EF_EXPLODE)
2577                     return AVERROR_INVALIDDATA;
2578             }
2579             break;
2580         case EXT_START_CODE:
2581             init_get_bits(&s2->gb, buf_ptr, input_size * 8);
2582
2583             switch (get_bits(&s2->gb, 4)) {
2584             case 0x1:
2585                 if (last_code == 0) {
2586                     mpeg_decode_sequence_extension(s);
2587                 } else {
2588                     av_log(avctx, AV_LOG_ERROR,
2589                            "ignoring seq ext after %X\n", last_code);
2590                     if (avctx->err_recognition & AV_EF_EXPLODE)
2591                         return AVERROR_INVALIDDATA;
2592                 }
2593                 break;
2594             case 0x2:
2595                 mpeg_decode_sequence_display_extension(s);
2596                 break;
2597             case 0x3:
2598                 mpeg_decode_quant_matrix_extension(s2);
2599                 break;
2600             case 0x7:
2601                 mpeg_decode_picture_display_extension(s);
2602                 break;
2603             case 0x8:
2604                 if (last_code == PICTURE_START_CODE) {
2605                     mpeg_decode_picture_coding_extension(s);
2606                 } else {
2607                     av_log(avctx, AV_LOG_ERROR,
2608                            "ignoring pic cod ext after %X\n", last_code);
2609                     if (avctx->err_recognition & AV_EF_EXPLODE)
2610                         return AVERROR_INVALIDDATA;
2611                 }
2612                 break;
2613             }
2614             break;
2615         case USER_START_CODE:
2616             mpeg_decode_user_data(avctx, buf_ptr, input_size);
2617             break;
2618         case GOP_START_CODE:
2619             if (last_code == 0) {
2620                 s2->first_field = 0;
2621                 mpeg_decode_gop(avctx, buf_ptr, input_size);
2622                 s->sync = 1;
2623             } else {
2624                 av_log(avctx, AV_LOG_ERROR,
2625                        "ignoring GOP_START_CODE after %X\n", last_code);
2626                 if (avctx->err_recognition & AV_EF_EXPLODE)
2627                     return AVERROR_INVALIDDATA;
2628             }
2629             break;
2630         default:
2631             if (start_code >= SLICE_MIN_START_CODE &&
2632                 start_code <= SLICE_MAX_START_CODE && last_code == PICTURE_START_CODE) {
2633                 if (s2->progressive_sequence && !s2->progressive_frame) {
2634                     s2->progressive_frame = 1;
2635                     av_log(s2->avctx, AV_LOG_ERROR,
2636                            "interlaced frame in progressive sequence, ignoring\n");
2637                 }
2638
2639                 if (s2->picture_structure == 0 ||
2640                     (s2->progressive_frame && s2->picture_structure != PICT_FRAME)) {
2641                     av_log(s2->avctx, AV_LOG_ERROR,
2642                            "picture_structure %d invalid, ignoring\n",
2643                            s2->picture_structure);
2644                     s2->picture_structure = PICT_FRAME;
2645                 }
2646
2647                 if (s2->progressive_sequence && !s2->frame_pred_frame_dct)
2648                     av_log(s2->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
2649
2650                 if (s2->picture_structure == PICT_FRAME) {
2651                     s2->first_field = 0;
2652                     s2->v_edge_pos  = 16 * s2->mb_height;
2653                 } else {
2654                     s2->first_field ^= 1;
2655                     s2->v_edge_pos   = 8 * s2->mb_height;
2656                     memset(s2->mbskip_table, 0, s2->mb_stride * s2->mb_height);
2657                 }
2658             }
2659             if (start_code >= SLICE_MIN_START_CODE &&
2660                 start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2661                 const int field_pic = s2->picture_structure != PICT_FRAME;
2662                 int mb_y = start_code - SLICE_MIN_START_CODE;
2663                 last_code = SLICE_MIN_START_CODE;
2664                 if (s2->codec_id != AV_CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
2665                     mb_y += (*buf_ptr&0xE0)<<2;
2666
2667                 mb_y <<= field_pic;
2668                 if (s2->picture_structure == PICT_BOTTOM_FIELD)
2669                     mb_y++;
2670
2671                 if (buf_end - buf_ptr < 2) {
2672                     av_log(s2->avctx, AV_LOG_ERROR, "slice too small\n");
2673                     return AVERROR_INVALIDDATA;
2674                 }
2675
2676                 if (mb_y >= s2->mb_height) {
2677                     av_log(s2->avctx, AV_LOG_ERROR,
2678                            "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2679                     return AVERROR_INVALIDDATA;
2680                 }
2681
2682                 if (!s2->last_picture_ptr) {
2683                     /* Skip B-frames if we do not have reference frames and
2684                      * GOP is not closed. */
2685                     if (s2->pict_type == AV_PICTURE_TYPE_B) {
2686                         if (!s2->closed_gop) {
2687                             skip_frame = 1;
2688                             av_log(s2->avctx, AV_LOG_DEBUG,
2689                                    "Skipping B slice due to open GOP\n");
2690                             break;
2691                         }
2692                     }
2693                 }
2694                 if (s2->pict_type == AV_PICTURE_TYPE_I || (s2->avctx->flags2 & AV_CODEC_FLAG2_SHOW_ALL))
2695                     s->sync = 1;
2696                 if (!s2->next_picture_ptr) {
2697                     /* Skip P-frames if we do not have a reference frame or
2698                      * we have an invalid header. */
2699                     if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
2700                         skip_frame = 1;
2701                         av_log(s2->avctx, AV_LOG_DEBUG,
2702                                "Skipping P slice due to !sync\n");
2703                         break;
2704                     }
2705                 }
2706                 if ((avctx->skip_frame >= AVDISCARD_NONREF &&
2707                      s2->pict_type == AV_PICTURE_TYPE_B) ||
2708                     (avctx->skip_frame >= AVDISCARD_NONKEY &&
2709                      s2->pict_type != AV_PICTURE_TYPE_I) ||
2710                     avctx->skip_frame >= AVDISCARD_ALL) {
2711                     skip_frame = 1;
2712                     break;
2713                 }
2714
2715                 if (!s->mpeg_enc_ctx_allocated)
2716                     break;
2717
2718                 if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2719                     if (mb_y < avctx->skip_top ||
2720                         mb_y >= s2->mb_height - avctx->skip_bottom)
2721                         break;
2722                 }
2723
2724                 if (!s2->pict_type) {
2725                     av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2726                     if (avctx->err_recognition & AV_EF_EXPLODE)
2727                         return AVERROR_INVALIDDATA;
2728                     break;
2729                 }
2730
2731                 if (s->first_slice) {
2732                     skip_frame     = 0;
2733                     s->first_slice = 0;
2734                     if ((ret = mpeg_field_start(s2, buf, buf_size)) < 0)
2735                         return ret;
2736                 }
2737                 if (!s2->current_picture_ptr) {
2738                     av_log(avctx, AV_LOG_ERROR,
2739                            "current_picture not initialized\n");
2740                     return AVERROR_INVALIDDATA;
2741                 }
2742
2743                 if (HAVE_THREADS &&
2744                     (avctx->active_thread_type & FF_THREAD_SLICE) &&
2745                     !avctx->hwaccel) {
2746                     int threshold = (s2->mb_height * s->slice_count +
2747                                      s2->slice_context_count / 2) /
2748                                     s2->slice_context_count;
2749                     av_assert0(avctx->thread_count > 1);
2750                     if (threshold <= mb_y) {
2751                         MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2752
2753                         thread_context->start_mb_y = mb_y;
2754                         thread_context->end_mb_y   = s2->mb_height;
2755                         if (s->slice_count) {
2756                             s2->thread_context[s->slice_count - 1]->end_mb_y = mb_y;
2757                             ret = ff_update_duplicate_context(thread_context, s2);
2758                             if (ret < 0)
2759                                 return ret;
2760                         }
2761                         init_get_bits(&thread_context->gb, buf_ptr, input_size * 8);
2762                         s->slice_count++;
2763                     }
2764                     buf_ptr += 2; // FIXME add minimum number of bytes per slice
2765                 } else {
2766                     ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2767                     emms_c();
2768
2769                     if (ret < 0) {
2770                         if (avctx->err_recognition & AV_EF_EXPLODE)
2771                             return ret;
2772                         if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2773                             ff_er_add_slice(&s2->er, s2->resync_mb_x,
2774                                             s2->resync_mb_y, s2->mb_x, s2->mb_y,
2775                                             ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2776                     } else {
2777                         ff_er_add_slice(&s2->er, s2->resync_mb_x,
2778                                         s2->resync_mb_y, s2->mb_x - 1, s2->mb_y,
2779                                         ER_AC_END | ER_DC_END | ER_MV_END);
2780                     }
2781                 }
2782             }
2783             break;
2784         }
2785     }
2786 }
2787
2788 static int mpeg_decode_frame(AVCodecContext *avctx, void *data,
2789                              int *got_output, AVPacket *avpkt)
2790 {
2791     const uint8_t *buf = avpkt->data;
2792     int ret;
2793     int buf_size = avpkt->size;
2794     Mpeg1Context *s = avctx->priv_data;
2795     AVFrame *picture = data;
2796     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2797
2798     if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2799         /* special case for last picture */
2800         if (s2->low_delay == 0 && s2->next_picture_ptr) {
2801             int ret = av_frame_ref(picture, s2->next_picture_ptr->f);
2802             if (ret < 0)
2803                 return ret;
2804
2805             s2->next_picture_ptr = NULL;
2806
2807             *got_output = 1;
2808         }
2809         return buf_size;
2810     }
2811
2812     if (s2->avctx->flags & AV_CODEC_FLAG_TRUNCATED) {
2813         int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf,
2814                                            buf_size, NULL);
2815
2816         if (ff_combine_frame(&s2->parse_context, next,
2817                              (const uint8_t **) &buf, &buf_size) < 0)
2818             return buf_size;
2819     }
2820
2821     s2->codec_tag = avpriv_toupper4(avctx->codec_tag);
2822     if (s->mpeg_enc_ctx_allocated == 0 && (   s2->codec_tag == AV_RL32("VCR2")
2823                                            || s2->codec_tag == AV_RL32("BW10")
2824                                           ))
2825         vcr2_init_sequence(avctx);
2826
2827     s->slice_count = 0;
2828
2829     if (avctx->extradata && !s->extradata_decoded) {
2830         ret = decode_chunks(avctx, picture, got_output,
2831                             avctx->extradata, avctx->extradata_size);
2832         if (*got_output) {
2833             av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
2834             av_frame_unref(picture);
2835             *got_output = 0;
2836         }
2837         s->extradata_decoded = 1;
2838         if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) {
2839             s2->current_picture_ptr = NULL;
2840             return ret;
2841         }
2842     }
2843
2844     ret = decode_chunks(avctx, picture, got_output, buf, buf_size);
2845     if (ret<0 || *got_output) {
2846         s2->current_picture_ptr = NULL;
2847
2848         if (s2->timecode_frame_start != -1 && *got_output) {
2849             AVFrameSideData *tcside = av_frame_new_side_data(picture,
2850                                                              AV_FRAME_DATA_GOP_TIMECODE,
2851                                                              sizeof(int64_t));
2852             if (!tcside)
2853                 return AVERROR(ENOMEM);
2854             memcpy(tcside->data, &s2->timecode_frame_start, sizeof(int64_t));
2855
2856             s2->timecode_frame_start = -1;
2857         }
2858     }
2859
2860     return ret;
2861 }
2862
2863 static void flush(AVCodecContext *avctx)
2864 {
2865     Mpeg1Context *s = avctx->priv_data;
2866
2867     s->sync       = 0;
2868
2869     ff_mpeg_flush(avctx);
2870 }
2871
2872 static av_cold int mpeg_decode_end(AVCodecContext *avctx)
2873 {
2874     Mpeg1Context *s = avctx->priv_data;
2875
2876     if (s->mpeg_enc_ctx_allocated)
2877         ff_mpv_common_end(&s->mpeg_enc_ctx);
2878     av_freep(&s->a53_caption);
2879     return 0;
2880 }
2881
2882 AVCodec ff_mpeg1video_decoder = {
2883     .name                  = "mpeg1video",
2884     .long_name             = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2885     .type                  = AVMEDIA_TYPE_VIDEO,
2886     .id                    = AV_CODEC_ID_MPEG1VIDEO,
2887     .priv_data_size        = sizeof(Mpeg1Context),
2888     .init                  = mpeg_decode_init,
2889     .close                 = mpeg_decode_end,
2890     .decode                = mpeg_decode_frame,
2891     .capabilities          = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2892                              AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2893                              AV_CODEC_CAP_SLICE_THREADS,
2894     .caps_internal         = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
2895     .flush                 = flush,
2896     .max_lowres            = 3,
2897     .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context),
2898     .hw_configs            = (const AVCodecHWConfigInternal*[]) {
2899 #if CONFIG_MPEG1_NVDEC_HWACCEL
2900                                HWACCEL_NVDEC(mpeg1),
2901 #endif
2902 #if CONFIG_MPEG1_VDPAU_HWACCEL
2903                                HWACCEL_VDPAU(mpeg1),
2904 #endif
2905 #if CONFIG_MPEG1_VIDEOTOOLBOX_HWACCEL
2906                                HWACCEL_VIDEOTOOLBOX(mpeg1),
2907 #endif
2908 #if CONFIG_MPEG1_XVMC_HWACCEL
2909                                HWACCEL_XVMC(mpeg1),
2910 #endif
2911                                NULL
2912                            },
2913 };
2914
2915 AVCodec ff_mpeg2video_decoder = {
2916     .name           = "mpeg2video",
2917     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2918     .type           = AVMEDIA_TYPE_VIDEO,
2919     .id             = AV_CODEC_ID_MPEG2VIDEO,
2920     .priv_data_size = sizeof(Mpeg1Context),
2921     .init           = mpeg_decode_init,
2922     .close          = mpeg_decode_end,
2923     .decode         = mpeg_decode_frame,
2924     .capabilities   = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2925                       AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2926                       AV_CODEC_CAP_SLICE_THREADS,
2927     .caps_internal  = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
2928     .flush          = flush,
2929     .max_lowres     = 3,
2930     .profiles       = NULL_IF_CONFIG_SMALL(ff_mpeg2_video_profiles),
2931     .hw_configs     = (const AVCodecHWConfigInternal*[]) {
2932 #if CONFIG_MPEG2_DXVA2_HWACCEL
2933                         HWACCEL_DXVA2(mpeg2),
2934 #endif
2935 #if CONFIG_MPEG2_D3D11VA_HWACCEL
2936                         HWACCEL_D3D11VA(mpeg2),
2937 #endif
2938 #if CONFIG_MPEG2_D3D11VA2_HWACCEL
2939                         HWACCEL_D3D11VA2(mpeg2),
2940 #endif
2941 #if CONFIG_MPEG2_NVDEC_HWACCEL
2942                         HWACCEL_NVDEC(mpeg2),
2943 #endif
2944 #if CONFIG_MPEG2_VAAPI_HWACCEL
2945                         HWACCEL_VAAPI(mpeg2),
2946 #endif
2947 #if CONFIG_MPEG2_VDPAU_HWACCEL
2948                         HWACCEL_VDPAU(mpeg2),
2949 #endif
2950 #if CONFIG_MPEG2_VIDEOTOOLBOX_HWACCEL
2951                         HWACCEL_VIDEOTOOLBOX(mpeg2),
2952 #endif
2953 #if CONFIG_MPEG2_XVMC_HWACCEL
2954                         HWACCEL_XVMC(mpeg2),
2955 #endif
2956                         NULL
2957                     },
2958 };
2959
2960 //legacy decoder
2961 AVCodec ff_mpegvideo_decoder = {
2962     .name           = "mpegvideo",
2963     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2964     .type           = AVMEDIA_TYPE_VIDEO,
2965     .id             = AV_CODEC_ID_MPEG2VIDEO,
2966     .priv_data_size = sizeof(Mpeg1Context),
2967     .init           = mpeg_decode_init,
2968     .close          = mpeg_decode_end,
2969     .decode         = mpeg_decode_frame,
2970     .capabilities   = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 | AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SLICE_THREADS,
2971     .caps_internal  = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
2972     .flush          = flush,
2973     .max_lowres     = 3,
2974 };