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   1 /*
   2  * MPEG-1/2 decoder
   3  * Copyright (c) 2000, 2001 Fabrice Bellard
   4  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
   5  *
   6  * This file is part of Libav.
   7  *
   8  * Libav 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  * Libav 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 Libav; 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 #include <inttypes.h>
  29
  30 #include "libavutil/attributes.h"
  31 #include "libavutil/internal.h"
  32 #include "libavutil/stereo3d.h"
  33
  34 #include "avcodec.h"
  35 #include "bytestream.h"
  36 #include "error_resilience.h"
  37 #include "idctdsp.h"
  38 #include "internal.h"
  39 #include "mpeg_er.h"
  40 #include "mpeg12.h"
  41 #include "mpeg12data.h"
  42 #include "mpegutils.h"
  43 #include "mpegvideo.h"
  44 #include "thread.h"
  45 #include "version.h"
  46 #include "xvmc_internal.h"
  47
  48 typedef struct Mpeg1Context {
  49     MpegEncContext mpeg_enc_ctx;
  50     int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
  51     int repeat_field;           /* true if we must repeat the field */
  52     AVPanScan pan_scan;         /* some temporary storage for the panscan */
  53     AVStereo3D stereo3d;
  54     int has_stereo3d;
  55     uint8_t *a53_caption;
  56     int a53_caption_size;
  57     uint8_t afd;
  58     int has_afd;
  59     int slice_count;
  60     int save_aspect_info;
  61     int save_width, save_height, save_progressive_seq;
  62     AVRational frame_rate_ext;  /* MPEG-2 specific framerate modificator */
  63     int sync;                   /* Did we reach a sync point like a GOP/SEQ/KEYFrame? */
  64     int closed_gop;             /* GOP is closed */
  65     int first_slice;
  66     int extradata_decoded;
  67 } Mpeg1Context;
  68
  69 #define MB_TYPE_ZERO_MV   0x20000000
  70
  71 static const uint32_t ptype2mb_type[7] = {
  72                     MB_TYPE_INTRA,
  73                     MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
  74                     MB_TYPE_L0,
  75                     MB_TYPE_L0 | MB_TYPE_CBP,
  76     MB_TYPE_QUANT | MB_TYPE_INTRA,
  77     MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
  78     MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
  79 };
  80
  81 static const uint32_t btype2mb_type[11] = {
  82                     MB_TYPE_INTRA,
  83                     MB_TYPE_L1,
  84                     MB_TYPE_L1   | MB_TYPE_CBP,
  85                     MB_TYPE_L0,
  86                     MB_TYPE_L0   | MB_TYPE_CBP,
  87                     MB_TYPE_L0L1,
  88                     MB_TYPE_L0L1 | MB_TYPE_CBP,
  89     MB_TYPE_QUANT | MB_TYPE_INTRA,
  90     MB_TYPE_QUANT | MB_TYPE_L1   | MB_TYPE_CBP,
  91     MB_TYPE_QUANT | MB_TYPE_L0   | MB_TYPE_CBP,
  92     MB_TYPE_QUANT | MB_TYPE_L0L1 | MB_TYPE_CBP,
  93 };
  94
  95 static const uint8_t non_linear_qscale[32] = {
  96      0,  1,  2,  3,  4,  5,   6,   7,
  97      8, 10, 12, 14, 16, 18,  20,  22,
  98     24, 28, 32, 36, 40, 44,  48,  52,
  99     56, 64, 72, 80, 88, 96, 104, 112,
 100 };
 101
 102 /* as H.263, but only 17 codes */
 103 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
 104 {
 105     int code, sign, val, shift;
 106
 107     code = get_vlc2(&s->gb, ff_mv_vlc.table, MV_VLC_BITS, 2);
 108     if (code == 0)
 109         return pred;
 110     if (code < 0)
 111         return 0xffff;
 112
 113     sign  = get_bits1(&s->gb);
 114     shift = fcode - 1;
 115     val   = code;
 116     if (shift) {
 117         val  = (val - 1) << shift;
 118         val |= get_bits(&s->gb, shift);
 119         val++;
 120     }
 121     if (sign)
 122         val = -val;
 123     val += pred;
 124
 125     /* modulo decoding */
 126     return sign_extend(val, 5 + shift);
 127 }
 128
 129 #define check_scantable_index(ctx, x)                                         \
 130     do {                                                                      \
 131         if ((x) > 63) {                                                       \
 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_intra(MpegEncContext *s,
 139                                            int16_t *block, int n)
 140 {
 141     int level, dc, diff, i, j, run;
 142     int component;
 143     RLTable *rl                  = &ff_rl_mpeg1;
 144     uint8_t *const scantable     = s->intra_scantable.permutated;
 145     const uint16_t *quant_matrix = s->intra_matrix;
 146     const int qscale             = s->qscale;
 147
 148     /* DC coefficient */
 149     component = (n <= 3 ? 0 : n - 4 + 1);
 150     diff = decode_dc(&s->gb, component);
 151     if (diff >= 0xffff)
 152         return -1;
 153     dc  = s->last_dc[component];
 154     dc += diff;
 155     s->last_dc[component] = dc;
 156     block[0] = dc * quant_matrix[0];
 157     av_dlog(s->avctx, "dc=%d diff=%d\n", dc, diff);
 158     i = 0;
 159     {
 160         OPEN_READER(re, &s->gb);
 161         /* now quantify & encode AC coefficients */
 162         for (;;) {
 163             UPDATE_CACHE(re, &s->gb);
 164             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
 165                        TEX_VLC_BITS, 2, 0);
 166
 167             if (level == 127) {
 168                 break;
 169             } else if (level != 0) {
 170                 i += run;
 171                 check_scantable_index(s, i);
 172                 j = scantable[i];
 173                 level = (level * qscale * quant_matrix[j]) >> 4;
 174                 level = (level - 1) | 1;
 175                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
 176                         SHOW_SBITS(re, &s->gb, 1);
 177                 LAST_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                     LAST_SKIP_BITS(re, &s->gb, 8);
 188                 } else if (level == 0) {
 189                     level = SHOW_UBITS(re, &s->gb, 8);
 190                     LAST_SKIP_BITS(re, &s->gb, 8);
 191                 }
 192                 i += run;
 193                 check_scantable_index(s, i);
 194                 j = scantable[i];
 195                 if (level < 0) {
 196                     level = -level;
 197                     level = (level * qscale * quant_matrix[j]) >> 4;
 198                     level = (level - 1) | 1;
 199                     level = -level;
 200                 } else {
 201                     level = (level * qscale * quant_matrix[j]) >> 4;
 202                     level = (level - 1) | 1;
 203                 }
 204             }
 205
 206             block[j] = level;
 207         }
 208         CLOSE_READER(re, &s->gb);
 209     }
 210     s->block_last_index[n] = i;
 211     return 0;
 212 }
 213
 214 int ff_mpeg1_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
 215 {
 216     return mpeg1_decode_block_intra(s, block, n);
 217 }
 218
 219 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
 220                                            int16_t *block, int n)
 221 {
 222     int level, i, j, run;
 223     RLTable *rl                  = &ff_rl_mpeg1;
 224     uint8_t *const scantable     = s->intra_scantable.permutated;
 225     const uint16_t *quant_matrix = s->inter_matrix;
 226     const int qscale             = s->qscale;
 227
 228     {
 229         OPEN_READER(re, &s->gb);
 230         i = -1;
 231         // special case for first coefficient, no need to add second VLC table
 232         UPDATE_CACHE(re, &s->gb);
 233         if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
 234             level = (3 * qscale * quant_matrix[0]) >> 5;
 235             level = (level - 1) | 1;
 236             if (GET_CACHE(re, &s->gb) & 0x40000000)
 237                 level = -level;
 238             block[0] = level;
 239             i++;
 240             SKIP_BITS(re, &s->gb, 2);
 241             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
 242                 goto end;
 243         }
 244         /* now quantify & encode AC coefficients */
 245         for (;;) {
 246             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
 247                        TEX_VLC_BITS, 2, 0);
 248
 249             if (level != 0) {
 250                 i += run;
 251                 check_scantable_index(s, i);
 252                 j = scantable[i];
 253                 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 254                 level = (level - 1) | 1;
 255                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
 256                         SHOW_SBITS(re, &s->gb, 1);
 257                 SKIP_BITS(re, &s->gb, 1);
 258             } else {
 259                 /* escape */
 260                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
 261                 LAST_SKIP_BITS(re, &s->gb, 6);
 262                 UPDATE_CACHE(re, &s->gb);
 263                 level = SHOW_SBITS(re, &s->gb, 8);
 264                 SKIP_BITS(re, &s->gb, 8);
 265                 if (level == -128) {
 266                     level = SHOW_UBITS(re, &s->gb, 8) - 256;
 267                     SKIP_BITS(re, &s->gb, 8);
 268                 } else if (level == 0) {
 269                     level = SHOW_UBITS(re, &s->gb, 8);
 270                     SKIP_BITS(re, &s->gb, 8);
 271                 }
 272                 i += run;
 273                 check_scantable_index(s, i);
 274                 j = scantable[i];
 275                 if (level < 0) {
 276                     level = -level;
 277                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 278                     level = (level - 1) | 1;
 279                     level = -level;
 280                 } else {
 281                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 282                     level = (level - 1) | 1;
 283                 }
 284             }
 285
 286             block[j] = level;
 287             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
 288                 break;
 289             UPDATE_CACHE(re, &s->gb);
 290         }
 291 end:
 292         LAST_SKIP_BITS(re, &s->gb, 2);
 293         CLOSE_READER(re, &s->gb);
 294     }
 295     s->block_last_index[n] = i;
 296     return 0;
 297 }
 298
 299 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s,
 300                                                 int16_t *block, int n)
 301 {
 302     int level, i, j, run;
 303     RLTable *rl              = &ff_rl_mpeg1;
 304     uint8_t *const scantable = s->intra_scantable.permutated;
 305     const int qscale         = s->qscale;
 306
 307     {
 308         OPEN_READER(re, &s->gb);
 309         i = -1;
 310         // Special case for first coefficient, no need to add second VLC table.
 311         UPDATE_CACHE(re, &s->gb);
 312         if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
 313             level = (3 * qscale) >> 1;
 314             level = (level - 1) | 1;
 315             if (GET_CACHE(re, &s->gb) & 0x40000000)
 316                 level = -level;
 317             block[0] = level;
 318             i++;
 319             SKIP_BITS(re, &s->gb, 2);
 320             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
 321                 goto end;
 322         }
 323
 324         /* now quantify & encode AC coefficients */
 325         for (;;) {
 326             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
 327                        TEX_VLC_BITS, 2, 0);
 328
 329             if (level != 0) {
 330                 i += run;
 331                 check_scantable_index(s, i);
 332                 j = scantable[i];
 333                 level = ((level * 2 + 1) * qscale) >> 1;
 334                 level = (level - 1) | 1;
 335                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
 336                         SHOW_SBITS(re, &s->gb, 1);
 337                 SKIP_BITS(re, &s->gb, 1);
 338             } else {
 339                 /* escape */
 340                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
 341                 LAST_SKIP_BITS(re, &s->gb, 6);
 342                 UPDATE_CACHE(re, &s->gb);
 343                 level = SHOW_SBITS(re, &s->gb, 8);
 344                 SKIP_BITS(re, &s->gb, 8);
 345                 if (level == -128) {
 346                     level = SHOW_UBITS(re, &s->gb, 8) - 256;
 347                     SKIP_BITS(re, &s->gb, 8);
 348                 } else if (level == 0) {
 349                     level = SHOW_UBITS(re, &s->gb, 8);
 350                     SKIP_BITS(re, &s->gb, 8);
 351                 }
 352                 i += run;
 353                 check_scantable_index(s, i);
 354                 j = scantable[i];
 355                 if (level < 0) {
 356                     level = -level;
 357                     level = ((level * 2 + 1) * qscale) >> 1;
 358                     level = (level - 1) | 1;
 359                     level = -level;
 360                 } else {
 361                     level = ((level * 2 + 1) * qscale) >> 1;
 362                     level = (level - 1) | 1;
 363                 }
 364             }
 365
 366             block[j] = level;
 367             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
 368                 break;
 369             UPDATE_CACHE(re, &s->gb);
 370         }
 371 end:
 372         LAST_SKIP_BITS(re, &s->gb, 2);
 373         CLOSE_READER(re, &s->gb);
 374     }
 375     s->block_last_index[n] = i;
 376     return 0;
 377 }
 378
 379 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
 380                                                int16_t *block, int n)
 381 {
 382     int level, i, j, run;
 383     RLTable *rl = &ff_rl_mpeg1;
 384     uint8_t *const scantable = s->intra_scantable.permutated;
 385     const uint16_t *quant_matrix;
 386     const int qscale = s->qscale;
 387     int mismatch;
 388
 389     mismatch = 1;
 390
 391     {
 392         OPEN_READER(re, &s->gb);
 393         i = -1;
 394         if (n < 4)
 395             quant_matrix = s->inter_matrix;
 396         else
 397             quant_matrix = s->chroma_inter_matrix;
 398
 399         // Special case for first coefficient, no need to add second VLC table.
 400         UPDATE_CACHE(re, &s->gb);
 401         if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
 402             level = (3 * qscale * quant_matrix[0]) >> 5;
 403             if (GET_CACHE(re, &s->gb) & 0x40000000)
 404                 level = -level;
 405             block[0]  = level;
 406             mismatch ^= level;
 407             i++;
 408             SKIP_BITS(re, &s->gb, 2);
 409             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
 410                 goto end;
 411         }
 412
 413         /* now quantify & encode AC coefficients */
 414         for (;;) {
 415             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
 416                        TEX_VLC_BITS, 2, 0);
 417
 418             if (level != 0) {
 419                 i += run;
 420                 check_scantable_index(s, i);
 421                 j = scantable[i];
 422                 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 423                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
 424                         SHOW_SBITS(re, &s->gb, 1);
 425                 SKIP_BITS(re, &s->gb, 1);
 426             } else {
 427                 /* escape */
 428                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
 429                 LAST_SKIP_BITS(re, &s->gb, 6);
 430                 UPDATE_CACHE(re, &s->gb);
 431                 level = SHOW_SBITS(re, &s->gb, 12);
 432                 SKIP_BITS(re, &s->gb, 12);
 433
 434                 i += run;
 435                 check_scantable_index(s, i);
 436                 j = scantable[i];
 437                 if (level < 0) {
 438                     level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 439                     level = -level;
 440                 } else {
 441                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 442                 }
 443             }
 444
 445             mismatch ^= level;
 446             block[j]  = level;
 447             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
 448                 break;
 449             UPDATE_CACHE(re, &s->gb);
 450         }
 451 end:
 452         LAST_SKIP_BITS(re, &s->gb, 2);
 453         CLOSE_READER(re, &s->gb);
 454     }
 455     block[63] ^= (mismatch & 1);
 456
 457     s->block_last_index[n] = i;
 458     return 0;
 459 }
 460
 461 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
 462                                                     int16_t *block, int n)
 463 {
 464     int level, i, j, run;
 465     RLTable *rl              = &ff_rl_mpeg1;
 466     uint8_t *const scantable = s->intra_scantable.permutated;
 467     const int qscale         = s->qscale;
 468     OPEN_READER(re, &s->gb);
 469     i = -1;
 470
 471     // special case for first coefficient, no need to add second VLC table
 472     UPDATE_CACHE(re, &s->gb);
 473     if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
 474         level = (3 * qscale) >> 1;
 475         if (GET_CACHE(re, &s->gb) & 0x40000000)
 476             level = -level;
 477         block[0] = level;
 478         i++;
 479         SKIP_BITS(re, &s->gb, 2);
 480         if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
 481             goto end;
 482     }
 483
 484     /* now quantify & encode AC coefficients */
 485     for (;;) {
 486         GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
 487
 488         if (level != 0) {
 489             i += run;
 490             check_scantable_index(s, i);
 491             j = scantable[i];
 492             level = ((level * 2 + 1) * qscale) >> 1;
 493             level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
 494                     SHOW_SBITS(re, &s->gb, 1);
 495             SKIP_BITS(re, &s->gb, 1);
 496         } else {
 497             /* escape */
 498             run = SHOW_UBITS(re, &s->gb, 6) + 1;
 499             LAST_SKIP_BITS(re, &s->gb, 6);
 500             UPDATE_CACHE(re, &s->gb);
 501             level = SHOW_SBITS(re, &s->gb, 12);
 502             SKIP_BITS(re, &s->gb, 12);
 503
 504             i += run;
 505             check_scantable_index(s, i);
 506             j = scantable[i];
 507             if (level < 0) {
 508                 level = ((-level * 2 + 1) * qscale) >> 1;
 509                 level = -level;
 510             } else {
 511                 level = ((level * 2 + 1) * qscale) >> 1;
 512             }
 513         }
 514
 515         block[j] = level;
 516         if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
 517             break;
 518         UPDATE_CACHE(re, &s->gb);
 519     }
 520 end:
 521     LAST_SKIP_BITS(re, &s->gb, 2);
 522     CLOSE_READER(re, &s->gb);
 523     s->block_last_index[n] = i;
 524     return 0;
 525 }
 526
 527 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
 528                                            int16_t *block, int n)
 529 {
 530     int level, dc, diff, i, j, run;
 531     int component;
 532     RLTable *rl;
 533     uint8_t *const scantable = s->intra_scantable.permutated;
 534     const uint16_t *quant_matrix;
 535     const int qscale = s->qscale;
 536     int mismatch;
 537
 538     /* DC coefficient */
 539     if (n < 4) {
 540         quant_matrix = s->intra_matrix;
 541         component    = 0;
 542     } else {
 543         quant_matrix = s->chroma_intra_matrix;
 544         component    = (n & 1) + 1;
 545     }
 546     diff = decode_dc(&s->gb, component);
 547     if (diff >= 0xffff)
 548         return -1;
 549     dc  = s->last_dc[component];
 550     dc += diff;
 551     s->last_dc[component] = dc;
 552     block[0] = dc << (3 - s->intra_dc_precision);
 553     av_dlog(s->avctx, "dc=%d\n", block[0]);
 554     mismatch = block[0] ^ 1;
 555     i = 0;
 556     if (s->intra_vlc_format)
 557         rl = &ff_rl_mpeg2;
 558     else
 559         rl = &ff_rl_mpeg1;
 560
 561     {
 562         OPEN_READER(re, &s->gb);
 563         /* now quantify & encode AC coefficients */
 564         for (;;) {
 565             UPDATE_CACHE(re, &s->gb);
 566             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
 567                        TEX_VLC_BITS, 2, 0);
 568
 569             if (level == 127) {
 570                 break;
 571             } else if (level != 0) {
 572                 i += run;
 573                 check_scantable_index(s, i);
 574                 j = scantable[i];
 575                 level = (level * qscale * quant_matrix[j]) >> 4;
 576                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
 577                         SHOW_SBITS(re, &s->gb, 1);
 578                 LAST_SKIP_BITS(re, &s->gb, 1);
 579             } else {
 580                 /* escape */
 581                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
 582                 LAST_SKIP_BITS(re, &s->gb, 6);
 583                 UPDATE_CACHE(re, &s->gb);
 584                 level = SHOW_SBITS(re, &s->gb, 12);
 585                 SKIP_BITS(re, &s->gb, 12);
 586                 i += run;
 587                 check_scantable_index(s, i);
 588                 j = scantable[i];
 589                 if (level < 0) {
 590                     level = (-level * qscale * quant_matrix[j]) >> 4;
 591                     level = -level;
 592                 } else {
 593                     level = (level * qscale * quant_matrix[j]) >> 4;
 594                 }
 595             }
 596
 597             mismatch ^= level;
 598             block[j]  = level;
 599         }
 600         CLOSE_READER(re, &s->gb);
 601     }
 602     block[63] ^= mismatch & 1;
 603
 604     s->block_last_index[n] = i;
 605     return 0;
 606 }
 607
 608 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
 609                                                 int16_t *block, int n)
 610 {
 611     int level, dc, diff, i, j, run;
 612     int component;
 613     RLTable *rl;
 614     uint8_t *const scantable = s->intra_scantable.permutated;
 615     const uint16_t *quant_matrix;
 616     const int qscale = s->qscale;
 617
 618     /* DC coefficient */
 619     if (n < 4) {
 620         quant_matrix = s->intra_matrix;
 621         component    = 0;
 622     } else {
 623         quant_matrix = s->chroma_intra_matrix;
 624         component    = (n & 1) + 1;
 625     }
 626     diff = decode_dc(&s->gb, component);
 627     if (diff >= 0xffff)
 628         return -1;
 629     dc = s->last_dc[component];
 630     dc += diff;
 631     s->last_dc[component] = dc;
 632     block[0] = dc << (3 - s->intra_dc_precision);
 633     i = 0;
 634     if (s->intra_vlc_format)
 635         rl = &ff_rl_mpeg2;
 636     else
 637         rl = &ff_rl_mpeg1;
 638
 639     {
 640         OPEN_READER(re, &s->gb);
 641         /* now quantify & encode AC coefficients */
 642         for (;;) {
 643             UPDATE_CACHE(re, &s->gb);
 644             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
 645                        TEX_VLC_BITS, 2, 0);
 646
 647             if (level == 127) {
 648                 break;
 649             } else if (level != 0) {
 650                 i += run;
 651                 check_scantable_index(s, i);
 652                 j = scantable[i];
 653                 level = (level * qscale * quant_matrix[j]) >> 4;
 654                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
 655                         SHOW_SBITS(re, &s->gb, 1);
 656                 LAST_SKIP_BITS(re, &s->gb, 1);
 657             } else {
 658                 /* escape */
 659                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
 660                 LAST_SKIP_BITS(re, &s->gb, 6);
 661                 UPDATE_CACHE(re, &s->gb);
 662                 level = SHOW_SBITS(re, &s->gb, 12);
 663                 SKIP_BITS(re, &s->gb, 12);
 664                 i += run;
 665                 check_scantable_index(s, i);
 666                 j = scantable[i];
 667                 if (level < 0) {
 668                     level = (-level * qscale * quant_matrix[j]) >> 4;
 669                     level = -level;
 670                 } else {
 671                     level = (level * qscale * quant_matrix[j]) >> 4;
 672                 }
 673             }
 674
 675             block[j] = level;
 676         }
 677         CLOSE_READER(re, &s->gb);
 678     }
 679
 680     s->block_last_index[n] = i;
 681     return 0;
 682 }
 683
 684 /******************************************/
 685 /* decoding */
 686
 687 static inline int get_dmv(MpegEncContext *s)
 688 {
 689     if (get_bits1(&s->gb))
 690         return 1 - (get_bits1(&s->gb) << 1);
 691     else
 692         return 0;
 693 }
 694
 695 static inline int get_qscale(MpegEncContext *s)
 696 {
 697     int qscale = get_bits(&s->gb, 5);
 698     if (s->q_scale_type)
 699         return non_linear_qscale[qscale];
 700     else
 701         return qscale << 1;
 702 }
 703
 704 /* motion type (for MPEG-2) */
 705 #define MT_FIELD 1
 706 #define MT_FRAME 2
 707 #define MT_16X8  2
 708 #define MT_DMV   3
 709
 710 static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
 711 {
 712     int i, j, k, cbp, val, mb_type, motion_type;
 713     const int mb_block_count = 4 + (1 << s->chroma_format);
 714
 715     av_dlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
 716
 717     assert(s->mb_skipped == 0);
 718
 719     if (s->mb_skip_run-- != 0) {
 720         if (s->pict_type == AV_PICTURE_TYPE_P) {
 721             s->mb_skipped = 1;
 722             s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
 723                 MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
 724         } else {
 725             int mb_type;
 726
 727             if (s->mb_x)
 728                 mb_type = s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
 729             else
 730                 // FIXME not sure if this is allowed in MPEG at all
 731                 mb_type = s->current_picture.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1];
 732             if (IS_INTRA(mb_type))
 733                 return -1;
 734             s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
 735                 mb_type | MB_TYPE_SKIP;
 736 //            assert(s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1] & (MB_TYPE_16x16 | MB_TYPE_16x8));
 737
 738             if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
 739                 s->mb_skipped = 1;
 740         }
 741
 742         return 0;
 743     }
 744
 745     switch (s->pict_type) {
 746     default:
 747     case AV_PICTURE_TYPE_I:
 748         if (get_bits1(&s->gb) == 0) {
 749             if (get_bits1(&s->gb) == 0) {
 750                 av_log(s->avctx, AV_LOG_ERROR,
 751                        "invalid mb type in I Frame at %d %d\n",
 752                        s->mb_x, s->mb_y);
 753                 return -1;
 754             }
 755             mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
 756         } else {
 757             mb_type = MB_TYPE_INTRA;
 758         }
 759         break;
 760     case AV_PICTURE_TYPE_P:
 761         mb_type = get_vlc2(&s->gb, ff_mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
 762         if (mb_type < 0) {
 763             av_log(s->avctx, AV_LOG_ERROR,
 764                    "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
 765             return -1;
 766         }
 767         mb_type = ptype2mb_type[mb_type];
 768         break;
 769     case AV_PICTURE_TYPE_B:
 770         mb_type = get_vlc2(&s->gb, ff_mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
 771         if (mb_type < 0) {
 772             av_log(s->avctx, AV_LOG_ERROR,
 773                    "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
 774             return -1;
 775         }
 776         mb_type = btype2mb_type[mb_type];
 777         break;
 778     }
 779     av_dlog(s->avctx, "mb_type=%x\n", mb_type);
 780 //    motion_type = 0; /* avoid warning */
 781     if (IS_INTRA(mb_type)) {
 782         s->bdsp.clear_blocks(s->block[0]);
 783
 784         if (!s->chroma_y_shift)
 785             s->bdsp.clear_blocks(s->block[6]);
 786
 787         /* compute DCT type */
 788         // FIXME: add an interlaced_dct coded var?
 789         if (s->picture_structure == PICT_FRAME &&
 790             !s->frame_pred_frame_dct)
 791             s->interlaced_dct = get_bits1(&s->gb);
 792
 793         if (IS_QUANT(mb_type))
 794             s->qscale = get_qscale(s);
 795
 796         if (s->concealment_motion_vectors) {
 797             /* just parse them */
 798             if (s->picture_structure != PICT_FRAME)
 799                 skip_bits1(&s->gb);  /* field select */
 800
 801             s->mv[0][0][0]      =
 802             s->last_mv[0][0][0] =
 803             s->last_mv[0][1][0] = mpeg_decode_motion(s, s->mpeg_f_code[0][0],
 804                                                      s->last_mv[0][0][0]);
 805             s->mv[0][0][1]      =
 806             s->last_mv[0][0][1] =
 807             s->last_mv[0][1][1] = mpeg_decode_motion(s, s->mpeg_f_code[0][1],
 808                                                      s->last_mv[0][0][1]);
 809
 810             skip_bits1(&s->gb); /* marker */
 811         } else {
 812             /* reset mv prediction */
 813             memset(s->last_mv, 0, sizeof(s->last_mv));
 814         }
 815         s->mb_intra = 1;
 816 #if FF_API_XVMC
 817 FF_DISABLE_DEPRECATION_WARNINGS
 818         // if 1, we memcpy blocks in xvmcvideo
 819         if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
 820             ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
 821 FF_ENABLE_DEPRECATION_WARNINGS
 822 #endif /* FF_API_XVMC */
 823
 824         if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
 825             if (s->flags2 & CODEC_FLAG2_FAST) {
 826                 for (i = 0; i < 6; i++)
 827                     mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
 828             } else {
 829                 for (i = 0; i < mb_block_count; i++)
 830                     if (mpeg2_decode_block_intra(s, *s->pblocks[i], i) < 0)
 831                         return -1;
 832             }
 833         } else {
 834             for (i = 0; i < 6; i++)
 835                 if (mpeg1_decode_block_intra(s, *s->pblocks[i], i) < 0)
 836                     return -1;
 837         }
 838     } else {
 839         if (mb_type & MB_TYPE_ZERO_MV) {
 840             assert(mb_type & MB_TYPE_CBP);
 841
 842             s->mv_dir = MV_DIR_FORWARD;
 843             if (s->picture_structure == PICT_FRAME) {
 844                 if (!s->frame_pred_frame_dct)
 845                     s->interlaced_dct = get_bits1(&s->gb);
 846                 s->mv_type = MV_TYPE_16X16;
 847             } else {
 848                 s->mv_type            = MV_TYPE_FIELD;
 849                 mb_type              |= MB_TYPE_INTERLACED;
 850                 s->field_select[0][0] = s->picture_structure - 1;
 851             }
 852
 853             if (IS_QUANT(mb_type))
 854                 s->qscale = get_qscale(s);
 855
 856             s->last_mv[0][0][0] = 0;
 857             s->last_mv[0][0][1] = 0;
 858             s->last_mv[0][1][0] = 0;
 859             s->last_mv[0][1][1] = 0;
 860             s->mv[0][0][0]      = 0;
 861             s->mv[0][0][1]      = 0;
 862         } else {
 863             assert(mb_type & MB_TYPE_L0L1);
 864             // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
 865             /* get additional motion vector type */
 866             if (s->frame_pred_frame_dct) {
 867                 motion_type = MT_FRAME;
 868             } else {
 869                 motion_type = get_bits(&s->gb, 2);
 870                 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
 871                     s->interlaced_dct = get_bits1(&s->gb);
 872             }
 873
 874             if (IS_QUANT(mb_type))
 875                 s->qscale = get_qscale(s);
 876
 877             /* motion vectors */
 878             s->mv_dir = (mb_type >> 13) & 3;
 879             av_dlog(s->avctx, "motion_type=%d\n", motion_type);
 880             switch (motion_type) {
 881             case MT_FRAME: /* or MT_16X8 */
 882                 if (s->picture_structure == PICT_FRAME) {
 883                     mb_type   |= MB_TYPE_16x16;
 884                     s->mv_type = MV_TYPE_16X16;
 885                     for (i = 0; i < 2; i++) {
 886                         if (USES_LIST(mb_type, i)) {
 887                             /* MT_FRAME */
 888                             s->mv[i][0][0]      =
 889                             s->last_mv[i][0][0] =
 890                             s->last_mv[i][1][0] =
 891                                 mpeg_decode_motion(s, s->mpeg_f_code[i][0],
 892                                                    s->last_mv[i][0][0]);
 893                             s->mv[i][0][1]      =
 894                             s->last_mv[i][0][1] =
 895                             s->last_mv[i][1][1] =
 896                                 mpeg_decode_motion(s, s->mpeg_f_code[i][1],
 897                                                    s->last_mv[i][0][1]);
 898                             /* full_pel: only for MPEG-1 */
 899                             if (s->full_pel[i]) {
 900                                 s->mv[i][0][0] <<= 1;
 901                                 s->mv[i][0][1] <<= 1;
 902                             }
 903                         }
 904                     }
 905                 } else {
 906                     mb_type   |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
 907                     s->mv_type = MV_TYPE_16X8;
 908                     for (i = 0; i < 2; i++) {
 909                         if (USES_LIST(mb_type, i)) {
 910                             /* MT_16X8 */
 911                             for (j = 0; j < 2; j++) {
 912                                 s->field_select[i][j] = get_bits1(&s->gb);
 913                                 for (k = 0; k < 2; k++) {
 914                                     val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
 915                                                              s->last_mv[i][j][k]);
 916                                     s->last_mv[i][j][k] = val;
 917                                     s->mv[i][j][k]      = val;
 918                                 }
 919                             }
 920                         }
 921                     }
 922                 }
 923                 break;
 924             case MT_FIELD:
 925                 s->mv_type = MV_TYPE_FIELD;
 926                 if (s->picture_structure == PICT_FRAME) {
 927                     mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
 928                     for (i = 0; i < 2; i++) {
 929                         if (USES_LIST(mb_type, i)) {
 930                             for (j = 0; j < 2; j++) {
 931                                 s->field_select[i][j] = get_bits1(&s->gb);
 932                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
 933                                                          s->last_mv[i][j][0]);
 934                                 s->last_mv[i][j][0] = val;
 935                                 s->mv[i][j][0]      = val;
 936                                 av_dlog(s->avctx, "fmx=%d\n", val);
 937                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
 938                                                          s->last_mv[i][j][1] >> 1);
 939                                 s->last_mv[i][j][1] = val << 1;
 940                                 s->mv[i][j][1]      = val;
 941                                 av_dlog(s->avctx, "fmy=%d\n", val);
 942                             }
 943                         }
 944                     }
 945                 } else {
 946                     mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
 947                     for (i = 0; i < 2; i++) {
 948                         if (USES_LIST(mb_type, i)) {
 949                             s->field_select[i][0] = get_bits1(&s->gb);
 950                             for (k = 0; k < 2; k++) {
 951                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
 952                                                          s->last_mv[i][0][k]);
 953                                 s->last_mv[i][0][k] = val;
 954                                 s->last_mv[i][1][k] = val;
 955                                 s->mv[i][0][k]      = val;
 956                             }
 957                         }
 958                     }
 959                 }
 960                 break;
 961             case MT_DMV:
 962                 s->mv_type = MV_TYPE_DMV;
 963                 for (i = 0; i < 2; i++) {
 964                     if (USES_LIST(mb_type, i)) {
 965                         int dmx, dmy, mx, my, m;
 966                         const int my_shift = s->picture_structure == PICT_FRAME;
 967
 968                         mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
 969                                                 s->last_mv[i][0][0]);
 970                         s->last_mv[i][0][0] = mx;
 971                         s->last_mv[i][1][0] = mx;
 972                         dmx = get_dmv(s);
 973                         my  = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
 974                                                  s->last_mv[i][0][1] >> my_shift);
 975                         dmy = get_dmv(s);
 976
 977
 978                         s->last_mv[i][0][1] = my << my_shift;
 979                         s->last_mv[i][1][1] = my << my_shift;
 980
 981                         s->mv[i][0][0] = mx;
 982                         s->mv[i][0][1] = my;
 983                         s->mv[i][1][0] = mx; // not used
 984                         s->mv[i][1][1] = my; // not used
 985
 986                         if (s->picture_structure == PICT_FRAME) {
 987                             mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
 988
 989                             // m = 1 + 2 * s->top_field_first;
 990                             m = s->top_field_first ? 1 : 3;
 991
 992                             /* top -> top pred */
 993                             s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
 994                             s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
 995                             m = 4 - m;
 996                             s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
 997                             s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
 998                         } else {
 999                             mb_type |= MB_TYPE_16x16;
1000
1001                             s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1002                             s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1003                             if (s->picture_structure == PICT_TOP_FIELD)
1004                                 s->mv[i][2][1]--;
1005                             else
1006                                 s->mv[i][2][1]++;
1007                         }
1008                     }
1009                 }
1010                 break;
1011             default:
1012                 av_log(s->avctx, AV_LOG_ERROR,
1013                        "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
1014                 return -1;
1015             }
1016         }
1017
1018         s->mb_intra = 0;
1019         if (HAS_CBP(mb_type)) {
1020             s->bdsp.clear_blocks(s->block[0]);
1021
1022             cbp = get_vlc2(&s->gb, ff_mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1023             if (mb_block_count > 6) {
1024                 cbp <<= mb_block_count - 6;
1025                 cbp  |= get_bits(&s->gb, mb_block_count - 6);
1026                 s->bdsp.clear_blocks(s->block[6]);
1027             }
1028             if (cbp <= 0) {
1029                 av_log(s->avctx, AV_LOG_ERROR,
1030                        "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
1031                 return -1;
1032             }
1033
1034 #if FF_API_XVMC
1035 FF_DISABLE_DEPRECATION_WARNINGS
1036             // if 1, we memcpy blocks in xvmcvideo
1037             if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
1038                 ff_xvmc_pack_pblocks(s, cbp);
1039 FF_ENABLE_DEPRECATION_WARNINGS
1040 #endif /* FF_API_XVMC */
1041
1042             if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
1043                 if (s->flags2 & CODEC_FLAG2_FAST) {
1044                     for (i = 0; i < 6; i++) {
1045                         if (cbp & 32)
1046                             mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
1047                         else
1048                             s->block_last_index[i] = -1;
1049                         cbp += cbp;
1050                     }
1051                 } else {
1052                     cbp <<= 12 - mb_block_count;
1053
1054                     for (i = 0; i < mb_block_count; i++) {
1055                         if (cbp & (1 << 11)) {
1056                             if (mpeg2_decode_block_non_intra(s, *s->pblocks[i], i) < 0)
1057                                 return -1;
1058                         } else {
1059                             s->block_last_index[i] = -1;
1060                         }
1061                         cbp += cbp;
1062                     }
1063                 }
1064             } else {
1065                 if (s->flags2 & CODEC_FLAG2_FAST) {
1066                     for (i = 0; i < 6; i++) {
1067                         if (cbp & 32)
1068                             mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1069                         else
1070                             s->block_last_index[i] = -1;
1071                         cbp += cbp;
1072                     }
1073                 } else {
1074                     for (i = 0; i < 6; i++) {
1075                         if (cbp & 32) {
1076                             if (mpeg1_decode_block_inter(s, *s->pblocks[i], i) < 0)
1077                                 return -1;
1078                         } else {
1079                             s->block_last_index[i] = -1;
1080                         }
1081                         cbp += cbp;
1082                     }
1083                 }
1084             }
1085         } else {
1086             for (i = 0; i < 12; i++)
1087                 s->block_last_index[i] = -1;
1088         }
1089     }
1090
1091     s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1092
1093     return 0;
1094 }
1095
1096 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1097 {
1098     Mpeg1Context *s    = avctx->priv_data;
1099     MpegEncContext *s2 = &s->mpeg_enc_ctx;
1100
1101     ff_mpv_decode_defaults(s2);
1102
1103     s->mpeg_enc_ctx.avctx  = avctx;
1104     s->mpeg_enc_ctx.flags  = avctx->flags;
1105     s->mpeg_enc_ctx.flags2 = avctx->flags2;
1106
1107     /* we need some permutation to store matrices,
1108      * until the decoder sets the real permutation. */
1109     ff_mpv_idct_init(s2);
1110     ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1111     ff_mpeg12_init_vlcs();
1112
1113     s->mpeg_enc_ctx_allocated      = 0;
1114     s->mpeg_enc_ctx.picture_number = 0;
1115     s->repeat_field                = 0;
1116     s->mpeg_enc_ctx.codec_id       = avctx->codec->id;
1117     avctx->color_range             = AVCOL_RANGE_MPEG;
1118     if (avctx->codec->id == AV_CODEC_ID_MPEG1VIDEO)
1119         avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1120     else
1121         avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
1122     return 0;
1123 }
1124
1125 static int mpeg_decode_update_thread_context(AVCodecContext *avctx,
1126                                              const AVCodecContext *avctx_from)
1127 {
1128     Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1129     MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1130     int err;
1131
1132     if (avctx == avctx_from               ||
1133         !ctx_from->mpeg_enc_ctx_allocated ||
1134         !s1->context_initialized)
1135         return 0;
1136
1137     err = ff_mpeg_update_thread_context(avctx, avctx_from);
1138     if (err)
1139         return err;
1140
1141     if (!ctx->mpeg_enc_ctx_allocated)
1142         memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1143
1144     if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1145         s->picture_number++;
1146
1147     return 0;
1148 }
1149
1150 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1151                                  const uint8_t *new_perm)
1152 {
1153     uint16_t temp_matrix[64];
1154     int i;
1155
1156     memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1157
1158     for (i = 0; i < 64; i++)
1159         matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1160 }
1161
1162 #if FF_API_XVMC
1163 static const enum AVPixelFormat pixfmt_xvmc_mpg2_420[] = {
1164     AV_PIX_FMT_XVMC_MPEG2_IDCT,
1165     AV_PIX_FMT_XVMC_MPEG2_MC,
1166     AV_PIX_FMT_NONE
1167 };
1168 #endif /* FF_API_XVMC */
1169
1170 static const enum AVPixelFormat mpeg12_hwaccel_pixfmt_list_420[] = {
1171 #if CONFIG_MPEG2_DXVA2_HWACCEL
1172     AV_PIX_FMT_DXVA2_VLD,
1173 #endif
1174 #if CONFIG_MPEG2_VAAPI_HWACCEL
1175     AV_PIX_FMT_VAAPI_VLD,
1176 #endif
1177 #if CONFIG_MPEG1_VDPAU_HWACCEL | CONFIG_MPEG2_VDPAU_HWACCEL
1178     AV_PIX_FMT_VDPAU,
1179 #endif
1180     AV_PIX_FMT_YUV420P,
1181     AV_PIX_FMT_NONE
1182 };
1183
1184 static const enum AVPixelFormat mpeg12_pixfmt_list_422[] = {
1185     AV_PIX_FMT_YUV422P,
1186     AV_PIX_FMT_NONE
1187 };
1188
1189 static const enum AVPixelFormat mpeg12_pixfmt_list_444[] = {
1190     AV_PIX_FMT_YUV444P,
1191     AV_PIX_FMT_NONE
1192 };
1193
1194 static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
1195 {
1196     Mpeg1Context *s1  = avctx->priv_data;
1197     MpegEncContext *s = &s1->mpeg_enc_ctx;
1198     const enum AVPixelFormat *pix_fmts;
1199
1200 #if FF_API_XVMC
1201 FF_DISABLE_DEPRECATION_WARNINGS
1202     if (avctx->xvmc_acceleration)
1203         return ff_get_format(avctx, pixfmt_xvmc_mpg2_420);
1204 FF_ENABLE_DEPRECATION_WARNINGS
1205 #endif /* FF_API_XVMC */
1206
1207     if (s->chroma_format < 2)
1208         pix_fmts = mpeg12_hwaccel_pixfmt_list_420;
1209     else if (s->chroma_format == 2)
1210         pix_fmts = mpeg12_pixfmt_list_422;
1211     else
1212         pix_fmts = mpeg12_pixfmt_list_444;
1213
1214     return ff_get_format(avctx, pix_fmts);
1215 }
1216
1217 /* Call this function when we know all parameters.
1218  * It may be called in different places for MPEG-1 and MPEG-2. */
1219 static int mpeg_decode_postinit(AVCodecContext *avctx)
1220 {
1221     Mpeg1Context *s1  = avctx->priv_data;
1222     MpegEncContext *s = &s1->mpeg_enc_ctx;
1223     uint8_t old_permutation[64];
1224     int ret;
1225
1226     if ((s1->mpeg_enc_ctx_allocated == 0)                   ||
1227         avctx->coded_width       != s->width                ||
1228         avctx->coded_height      != s->height               ||
1229         s1->save_width           != s->width                ||
1230         s1->save_height          != s->height               ||
1231         s1->save_aspect_info     != s->aspect_ratio_info    ||
1232         s1->save_progressive_seq != s->progressive_sequence ||
1233         0) {
1234         if (s1->mpeg_enc_ctx_allocated) {
1235             ParseContext pc = s->parse_context;
1236             s->parse_context.buffer = 0;
1237             ff_mpv_common_end(s);
1238             s->parse_context = pc;
1239         }
1240
1241         if ((s->width == 0) || (s->height == 0))
1242             return -2;
1243
1244         ret = ff_set_dimensions(avctx, s->width, s->height);
1245         if (ret < 0)
1246             return ret;
1247
1248         avctx->bit_rate          = s->bit_rate;
1249         s1->save_aspect_info     = s->aspect_ratio_info;
1250         s1->save_width           = s->width;
1251         s1->save_height          = s->height;
1252         s1->save_progressive_seq = s->progressive_sequence;
1253
1254         /* low_delay may be forced, in this case we will have B-frames
1255          * that behave like P-frames. */
1256         avctx->has_b_frames = !s->low_delay;
1257
1258         if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1259             // MPEG-1 fps
1260             avctx->time_base.den = ff_mpeg12_frame_rate_tab[s->frame_rate_index].num;
1261             avctx->time_base.num = ff_mpeg12_frame_rate_tab[s->frame_rate_index].den;
1262             // MPEG-1 aspect
1263             avctx->sample_aspect_ratio = av_d2q(1.0 / ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1264             avctx->ticks_per_frame     = 1;
1265         } else { // MPEG-2
1266             // MPEG-2 fps
1267             av_reduce(&s->avctx->time_base.den,
1268                       &s->avctx->time_base.num,
1269                       ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num * 2,
1270                       ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1271                       1 << 30);
1272             avctx->ticks_per_frame = 2;
1273             // MPEG-2 aspect
1274             if (s->aspect_ratio_info > 1) {
1275                 AVRational dar =
1276                     av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1277                                       (AVRational) { s1->pan_scan.width,
1278                                                      s1->pan_scan.height }),
1279                              (AVRational) { s->width, s->height });
1280
1281                 /* We ignore the spec here and guess a bit as reality does not
1282                  * match the spec, see for example res_change_ffmpeg_aspect.ts
1283                  * and sequence-display-aspect.mpg.
1284                  * issue1613, 621, 562 */
1285                 if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1286                     (av_cmp_q(dar, (AVRational) { 4, 3 }) &&
1287                      av_cmp_q(dar, (AVRational) { 16, 9 }))) {
1288                     s->avctx->sample_aspect_ratio =
1289                         av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1290                                  (AVRational) { s->width, s->height });
1291                 } else {
1292                     s->avctx->sample_aspect_ratio =
1293                         av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1294                                  (AVRational) { s1->pan_scan.width, s1->pan_scan.height });
1295 // issue1613 4/3 16/9 -> 16/9
1296 // res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1297 // widescreen-issue562.mpg 4/3 16/9 -> 16/9
1298 //                    s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1299                     av_dlog(avctx, "A %d/%d\n",
1300                             ff_mpeg2_aspect[s->aspect_ratio_info].num,
1301                             ff_mpeg2_aspect[s->aspect_ratio_info].den);
1302                     av_dlog(avctx, "B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1303                             s->avctx->sample_aspect_ratio.den);
1304                 }
1305             } else {
1306                 s->avctx->sample_aspect_ratio =
1307                     ff_mpeg2_aspect[s->aspect_ratio_info];
1308             }
1309         } // MPEG-2
1310
1311         ff_set_sar(s->avctx, s->avctx->sample_aspect_ratio);
1312
1313         avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1314         // until then pix_fmt may be changed right after codec init
1315 #if FF_API_XVMC
1316         if ((avctx->pix_fmt == AV_PIX_FMT_XVMC_MPEG2_IDCT ||
1317              avctx->hwaccel) && avctx->idct_algo == FF_IDCT_AUTO)
1318 #else
1319         if (avctx->hwaccel && avctx->idct_algo == FF_IDCT_AUTO)
1320 #endif /* FF_API_XVMC */
1321             avctx->idct_algo = FF_IDCT_SIMPLE;
1322
1323         /* Quantization matrices may need reordering
1324          * if DCT permutation is changed. */
1325         memcpy(old_permutation, s->idsp.idct_permutation, 64 * sizeof(uint8_t));
1326
1327         ff_mpv_idct_init(s);
1328         if (ff_mpv_common_init(s) < 0)
1329             return -2;
1330
1331         quant_matrix_rebuild(s->intra_matrix,        old_permutation, s->idsp.idct_permutation);
1332         quant_matrix_rebuild(s->inter_matrix,        old_permutation, s->idsp.idct_permutation);
1333         quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->idsp.idct_permutation);
1334         quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->idsp.idct_permutation);
1335
1336         s1->mpeg_enc_ctx_allocated = 1;
1337     }
1338     return 0;
1339 }
1340
1341 static int mpeg1_decode_picture(AVCodecContext *avctx, const uint8_t *buf,
1342                                 int buf_size)
1343 {
1344     Mpeg1Context *s1  = avctx->priv_data;
1345     MpegEncContext *s = &s1->mpeg_enc_ctx;
1346     int ref, f_code, vbv_delay;
1347
1348     init_get_bits(&s->gb, buf, buf_size * 8);
1349
1350     ref = get_bits(&s->gb, 10); /* temporal ref */
1351     s->pict_type = get_bits(&s->gb, 3);
1352     if (s->pict_type == 0 || s->pict_type > 3)
1353         return -1;
1354
1355     vbv_delay = get_bits(&s->gb, 16);
1356     if (s->pict_type == AV_PICTURE_TYPE_P ||
1357         s->pict_type == AV_PICTURE_TYPE_B) {
1358         s->full_pel[0] = get_bits1(&s->gb);
1359         f_code = get_bits(&s->gb, 3);
1360         if (f_code == 0 && (avctx->err_recognition & AV_EF_BITSTREAM))
1361             return -1;
1362         s->mpeg_f_code[0][0] = f_code;
1363         s->mpeg_f_code[0][1] = f_code;
1364     }
1365     if (s->pict_type == AV_PICTURE_TYPE_B) {
1366         s->full_pel[1] = get_bits1(&s->gb);
1367         f_code = get_bits(&s->gb, 3);
1368         if (f_code == 0 && (avctx->err_recognition & AV_EF_BITSTREAM))
1369             return -1;
1370         s->mpeg_f_code[1][0] = f_code;
1371         s->mpeg_f_code[1][1] = f_code;
1372     }
1373     s->current_picture.f->pict_type = s->pict_type;
1374     s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1375
1376     if (avctx->debug & FF_DEBUG_PICT_INFO)
1377         av_log(avctx, AV_LOG_DEBUG,
1378                "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1379
1380     s->y_dc_scale = 8;
1381     s->c_dc_scale = 8;
1382     return 0;
1383 }
1384
1385 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1386 {
1387     MpegEncContext *s = &s1->mpeg_enc_ctx;
1388     int horiz_size_ext, vert_size_ext;
1389     int bit_rate_ext;
1390
1391     skip_bits(&s->gb, 1); /* profile and level esc*/
1392     s->avctx->profile       = get_bits(&s->gb, 3);
1393     s->avctx->level         = get_bits(&s->gb, 4);
1394     s->progressive_sequence = get_bits1(&s->gb);   /* progressive_sequence */
1395     s->chroma_format        = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1396     horiz_size_ext          = get_bits(&s->gb, 2);
1397     vert_size_ext           = get_bits(&s->gb, 2);
1398     s->width  |= (horiz_size_ext << 12);
1399     s->height |= (vert_size_ext  << 12);
1400     bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1401     s->bit_rate += (bit_rate_ext << 18) * 400;
1402     skip_bits1(&s->gb); /* marker */
1403     s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1404
1405     s->low_delay = get_bits1(&s->gb);
1406     if (s->flags & CODEC_FLAG_LOW_DELAY)
1407         s->low_delay = 1;
1408
1409     s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1410     s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1411
1412     av_dlog(s->avctx, "sequence extension\n");
1413     s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1414
1415     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1416         av_log(s->avctx, AV_LOG_DEBUG,
1417                "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1418                s->avctx->profile, s->avctx->level,
1419                s->avctx->rc_buffer_size, s->bit_rate);
1420 }
1421
1422 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1423 {
1424     MpegEncContext *s = &s1->mpeg_enc_ctx;
1425     int color_description, w, h;
1426
1427     skip_bits(&s->gb, 3); /* video format */
1428     color_description = get_bits1(&s->gb);
1429     if (color_description) {
1430         s->avctx->color_primaries = get_bits(&s->gb, 8);
1431         s->avctx->color_trc       = get_bits(&s->gb, 8);
1432         s->avctx->colorspace      = get_bits(&s->gb, 8);
1433     }
1434     w = get_bits(&s->gb, 14);
1435     skip_bits(&s->gb, 1); // marker
1436     h = get_bits(&s->gb, 14);
1437     // remaining 3 bits are zero padding
1438
1439     s1->pan_scan.width  = 16 * w;
1440     s1->pan_scan.height = 16 * h;
1441
1442     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1443         av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1444 }
1445
1446 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1447 {
1448     MpegEncContext *s = &s1->mpeg_enc_ctx;
1449     int i, nofco;
1450
1451     nofco = 1;
1452     if (s->progressive_sequence) {
1453         if (s->repeat_first_field) {
1454             nofco++;
1455             if (s->top_field_first)
1456                 nofco++;
1457         }
1458     } else {
1459         if (s->picture_structure == PICT_FRAME) {
1460             nofco++;
1461             if (s->repeat_first_field)
1462                 nofco++;
1463         }
1464     }
1465     for (i = 0; i < nofco; i++) {
1466         s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1467         skip_bits(&s->gb, 1); // marker
1468         s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1469         skip_bits(&s->gb, 1); // marker
1470     }
1471
1472     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1473         av_log(s->avctx, AV_LOG_DEBUG,
1474                "pde (%"PRId16",%"PRId16") (%"PRId16",%"PRId16") (%"PRId16",%"PRId16")\n",
1475                s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1476                s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1477                s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1478 }
1479
1480 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64],
1481                        uint16_t matrix1[64], int intra)
1482 {
1483     int i;
1484
1485     for (i = 0; i < 64; i++) {
1486         int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1487         int v = get_bits(&s->gb, 8);
1488         if (v == 0) {
1489             av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1490             return -1;
1491         }
1492         if (intra && i == 0 && v != 8) {
1493             av_log(s->avctx, AV_LOG_ERROR, "intra matrix invalid, ignoring\n");
1494             v = 8; // needed by pink.mpg / issue1046
1495         }
1496         matrix0[j] = v;
1497         if (matrix1)
1498             matrix1[j] = v;
1499     }
1500     return 0;
1501 }
1502
1503 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1504 {
1505     av_dlog(s->avctx, "matrix extension\n");
1506
1507     if (get_bits1(&s->gb))
1508         load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1509     if (get_bits1(&s->gb))
1510         load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1511     if (get_bits1(&s->gb))
1512         load_matrix(s, s->chroma_intra_matrix, NULL, 1);
1513     if (get_bits1(&s->gb))
1514         load_matrix(s, s->chroma_inter_matrix, NULL, 0);
1515 }
1516
1517 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1518 {
1519     MpegEncContext *s = &s1->mpeg_enc_ctx;
1520
1521     s->full_pel[0]       = s->full_pel[1] = 0;
1522     s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1523     s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1524     s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1525     s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1526     if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1527         av_log(s->avctx, AV_LOG_ERROR,
1528                "Missing picture start code, guessing missing values\n");
1529         if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1530             if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1531                 s->pict_type = AV_PICTURE_TYPE_I;
1532             else
1533                 s->pict_type = AV_PICTURE_TYPE_P;
1534         } else
1535             s->pict_type = AV_PICTURE_TYPE_B;
1536         s->current_picture.f->pict_type = s->pict_type;
1537         s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1538     }
1539     s->intra_dc_precision         = get_bits(&s->gb, 2);
1540     s->picture_structure          = get_bits(&s->gb, 2);
1541     s->top_field_first            = get_bits1(&s->gb);
1542     s->frame_pred_frame_dct       = get_bits1(&s->gb);
1543     s->concealment_motion_vectors = get_bits1(&s->gb);
1544     s->q_scale_type               = get_bits1(&s->gb);
1545     s->intra_vlc_format           = get_bits1(&s->gb);
1546     s->alternate_scan             = get_bits1(&s->gb);
1547     s->repeat_first_field         = get_bits1(&s->gb);
1548     s->chroma_420_type            = get_bits1(&s->gb);
1549     s->progressive_frame          = get_bits1(&s->gb);
1550
1551     if (s->progressive_sequence && !s->progressive_frame) {
1552         s->progressive_frame = 1;
1553         av_log(s->avctx, AV_LOG_ERROR,
1554                "interlaced frame in progressive sequence, ignoring\n");
1555     }
1556
1557     if (s->picture_structure == 0 ||
1558         (s->progressive_frame && s->picture_structure != PICT_FRAME)) {
1559         av_log(s->avctx, AV_LOG_ERROR,
1560                "picture_structure %d invalid, ignoring\n",
1561                s->picture_structure);
1562         s->picture_structure = PICT_FRAME;
1563     }
1564
1565     if (s->progressive_sequence && !s->frame_pred_frame_dct)
1566         av_log(s->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
1567
1568     if (s->picture_structure == PICT_FRAME) {
1569         s->first_field = 0;
1570         s->v_edge_pos  = 16 * s->mb_height;
1571     } else {
1572         s->first_field ^= 1;
1573         s->v_edge_pos   = 8 * s->mb_height;
1574         memset(s->mbskip_table, 0, s->mb_stride * s->mb_height);
1575     }
1576
1577     if (s->alternate_scan) {
1578         ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1579         ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1580     } else {
1581         ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1582         ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1583     }
1584
1585     /* composite display not parsed */
1586     av_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1587     av_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1588     av_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1589     av_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1590     av_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1591     av_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1592     av_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1593     av_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1594     av_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1595 }
1596
1597 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1598 {
1599     AVCodecContext *avctx = s->avctx;
1600     Mpeg1Context *s1      = (Mpeg1Context *) s;
1601
1602     /* start frame decoding */
1603     if (s->first_field || s->picture_structure == PICT_FRAME) {
1604         AVFrameSideData *pan_scan;
1605
1606         if (ff_mpv_frame_start(s, avctx) < 0)
1607             return -1;
1608
1609         ff_mpeg_er_frame_start(s);
1610
1611         /* first check if we must repeat the frame */
1612         s->current_picture_ptr->f->repeat_pict = 0;
1613         if (s->repeat_first_field) {
1614             if (s->progressive_sequence) {
1615                 if (s->top_field_first)
1616                     s->current_picture_ptr->f->repeat_pict = 4;
1617                 else
1618                     s->current_picture_ptr->f->repeat_pict = 2;
1619             } else if (s->progressive_frame) {
1620                 s->current_picture_ptr->f->repeat_pict = 1;
1621             }
1622         }
1623
1624         pan_scan = av_frame_new_side_data(s->current_picture_ptr->f,
1625                                           AV_FRAME_DATA_PANSCAN,
1626                                           sizeof(s1->pan_scan));
1627         if (!pan_scan)
1628             return AVERROR(ENOMEM);
1629         memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
1630
1631         if (s1->a53_caption) {
1632             AVFrameSideData *sd = av_frame_new_side_data(
1633                 s->current_picture_ptr->f, AV_FRAME_DATA_A53_CC,
1634                 s1->a53_caption_size);
1635             if (sd)
1636                 memcpy(sd->data, s1->a53_caption, s1->a53_caption_size);
1637             av_freep(&s1->a53_caption);
1638         }
1639
1640         if (s1->has_stereo3d) {
1641             AVStereo3D *stereo = av_stereo3d_create_side_data(s->current_picture_ptr->f);
1642             if (!stereo)
1643                 return AVERROR(ENOMEM);
1644
1645             *stereo = s1->stereo3d;
1646             s1->has_stereo3d = 0;
1647         }
1648
1649         if (s1->has_afd) {
1650             AVFrameSideData *sd =
1651                 av_frame_new_side_data(s->current_picture_ptr->f,
1652                                        AV_FRAME_DATA_AFD, 1);
1653             if (!sd)
1654                 return AVERROR(ENOMEM);
1655
1656             *sd->data   = s1->afd;
1657             s1->has_afd = 0;
1658         }
1659
1660         if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1661             ff_thread_finish_setup(avctx);
1662     } else { // second field
1663         int i;
1664
1665         if (!s->current_picture_ptr) {
1666             av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1667             return -1;
1668         }
1669
1670         if (s->avctx->hwaccel &&
1671             (s->avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
1672             if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1673                 av_log(avctx, AV_LOG_ERROR,
1674                        "hardware accelerator failed to decode first field\n");
1675         }
1676
1677         for (i = 0; i < 4; i++) {
1678             s->current_picture.f->data[i] = s->current_picture_ptr->f->data[i];
1679             if (s->picture_structure == PICT_BOTTOM_FIELD)
1680                 s->current_picture.f->data[i] +=
1681                     s->current_picture_ptr->f->linesize[i];
1682         }
1683     }
1684
1685     if (avctx->hwaccel) {
1686         if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
1687             return -1;
1688     }
1689
1690 #if FF_API_XVMC
1691 FF_DISABLE_DEPRECATION_WARNINGS
1692 // ff_mpv_frame_start will call this function too,
1693 // but we need to call it on every field
1694     if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1695         if (ff_xvmc_field_start(s, avctx) < 0)
1696             return -1;
1697 FF_ENABLE_DEPRECATION_WARNINGS
1698 #endif /* FF_API_XVMC */
1699
1700     return 0;
1701 }
1702
1703 #define DECODE_SLICE_ERROR -1
1704 #define DECODE_SLICE_OK     0
1705
1706 /**
1707  * Decode a slice.
1708  * MpegEncContext.mb_y must be set to the MB row from the startcode.
1709  * @return DECODE_SLICE_ERROR if the slice is damaged,
1710  *         DECODE_SLICE_OK if this slice is OK
1711  */
1712 static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1713                              const uint8_t **buf, int buf_size)
1714 {
1715     AVCodecContext *avctx = s->avctx;
1716     const int field_pic   = s->picture_structure != PICT_FRAME;
1717
1718     s->resync_mb_x =
1719     s->resync_mb_y = -1;
1720
1721     assert(mb_y < s->mb_height);
1722
1723     init_get_bits(&s->gb, *buf, buf_size * 8);
1724
1725     ff_mpeg1_clean_buffers(s);
1726     s->interlaced_dct = 0;
1727
1728     s->qscale = get_qscale(s);
1729
1730     if (s->qscale == 0) {
1731         av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1732         return -1;
1733     }
1734
1735     /* extra slice info */
1736     while (get_bits1(&s->gb) != 0)
1737         skip_bits(&s->gb, 8);
1738
1739     s->mb_x = 0;
1740
1741     if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1742         skip_bits1(&s->gb);
1743     } else {
1744         while (get_bits_left(&s->gb) > 0) {
1745             int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1746                                 MBINCR_VLC_BITS, 2);
1747             if (code < 0) {
1748                 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1749                 return -1;
1750             }
1751             if (code >= 33) {
1752                 if (code == 33)
1753                     s->mb_x += 33;
1754                 /* otherwise, stuffing, nothing to do */
1755             } else {
1756                 s->mb_x += code;
1757                 break;
1758             }
1759         }
1760     }
1761
1762     if (s->mb_x >= (unsigned) s->mb_width) {
1763         av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1764         return -1;
1765     }
1766
1767     if (avctx->hwaccel) {
1768         const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1769         int start_code = -1;
1770         buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1771         if (buf_end < *buf + buf_size)
1772             buf_end -= 4;
1773         s->mb_y = mb_y;
1774         if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1775             return DECODE_SLICE_ERROR;
1776         *buf = buf_end;
1777         return DECODE_SLICE_OK;
1778     }
1779
1780     s->resync_mb_x = s->mb_x;
1781     s->resync_mb_y = s->mb_y = mb_y;
1782     s->mb_skip_run = 0;
1783     ff_init_block_index(s);
1784
1785     if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1786         if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1787             av_log(s->avctx, AV_LOG_DEBUG,
1788                    "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",
1789                    s->qscale,
1790                    s->mpeg_f_code[0][0], s->mpeg_f_code[0][1],
1791                    s->mpeg_f_code[1][0], s->mpeg_f_code[1][1],
1792                    s->pict_type  == AV_PICTURE_TYPE_I ? "I" :
1793                    (s->pict_type == AV_PICTURE_TYPE_P ? "P" :
1794                    (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
1795                    s->progressive_sequence ? "ps"  : "",
1796                    s->progressive_frame    ? "pf"  : "",
1797                    s->alternate_scan       ? "alt" : "",
1798                    s->top_field_first      ? "top" : "",
1799                    s->intra_dc_precision, s->picture_structure,
1800                    s->frame_pred_frame_dct, s->concealment_motion_vectors,
1801                    s->q_scale_type, s->intra_vlc_format,
1802                    s->repeat_first_field, s->chroma_420_type ? "420" : "");
1803         }
1804     }
1805
1806     for (;;) {
1807 #if FF_API_XVMC
1808 FF_DISABLE_DEPRECATION_WARNINGS
1809         // If 1, we memcpy blocks in xvmcvideo.
1810         if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
1811             ff_xvmc_init_block(s); // set s->block
1812 FF_ENABLE_DEPRECATION_WARNINGS
1813 #endif /* FF_API_XVMC */
1814
1815         if (mpeg_decode_mb(s, s->block) < 0)
1816             return -1;
1817
1818         // Note motion_val is normally NULL unless we want to extract the MVs.
1819         if (s->current_picture.motion_val[0] && !s->encoding) {
1820             const int wrap = s->b8_stride;
1821             int xy         = s->mb_x * 2 + s->mb_y * 2 * wrap;
1822             int b8_xy      = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1823             int motion_x, motion_y, dir, i;
1824
1825             for (i = 0; i < 2; i++) {
1826                 for (dir = 0; dir < 2; dir++) {
1827                     if (s->mb_intra ||
1828                         (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1829                         motion_x = motion_y = 0;
1830                     } else if (s->mv_type == MV_TYPE_16X16 ||
1831                                (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1832                         motion_x = s->mv[dir][0][0];
1833                         motion_y = s->mv[dir][0][1];
1834                     } else { /* if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8)) */
1835                         motion_x = s->mv[dir][i][0];
1836                         motion_y = s->mv[dir][i][1];
1837                     }
1838
1839                     s->current_picture.motion_val[dir][xy][0]     = motion_x;
1840                     s->current_picture.motion_val[dir][xy][1]     = motion_y;
1841                     s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1842                     s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1843                     s->current_picture.ref_index [dir][b8_xy]     =
1844                     s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1845                     assert(s->field_select[dir][i] == 0 ||
1846                            s->field_select[dir][i] == 1);
1847                 }
1848                 xy    += wrap;
1849                 b8_xy += 2;
1850             }
1851         }
1852
1853         s->dest[0] += 16;
1854         s->dest[1] += 16 >> s->chroma_x_shift;
1855         s->dest[2] += 16 >> s->chroma_x_shift;
1856
1857         ff_mpv_decode_mb(s, s->block);
1858
1859         if (++s->mb_x >= s->mb_width) {
1860             const int mb_size = 16;
1861
1862             ff_mpeg_draw_horiz_band(s, mb_size * (s->mb_y >> field_pic), mb_size);
1863             ff_mpv_report_decode_progress(s);
1864
1865             s->mb_x  = 0;
1866             s->mb_y += 1 << field_pic;
1867
1868             if (s->mb_y >= s->mb_height) {
1869                 int left   = get_bits_left(&s->gb);
1870                 int is_d10 = s->chroma_format == 2 &&
1871                              s->pict_type == AV_PICTURE_TYPE_I &&
1872                              avctx->profile == 0 && avctx->level == 5 &&
1873                              s->intra_dc_precision == 2 &&
1874                              s->q_scale_type == 1 && s->alternate_scan == 0 &&
1875                              s->progressive_frame == 0
1876                              /* vbv_delay == 0xBBB || 0xE10 */;
1877
1878                 if (left < 0 ||
1879                     (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10) ||
1880                     ((avctx->err_recognition & AV_EF_BUFFER) && left > 8)) {
1881                     av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n",
1882                            left, show_bits(&s->gb, FFMIN(left, 23)));
1883                     return -1;
1884                 } else
1885                     goto eos;
1886             }
1887
1888             ff_init_block_index(s);
1889         }
1890
1891         /* skip mb handling */
1892         if (s->mb_skip_run == -1) {
1893             /* read increment again */
1894             s->mb_skip_run = 0;
1895             for (;;) {
1896                 int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1897                                     MBINCR_VLC_BITS, 2);
1898                 if (code < 0) {
1899                     av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1900                     return -1;
1901                 }
1902                 if (code >= 33) {
1903                     if (code == 33) {
1904                         s->mb_skip_run += 33;
1905                     } else if (code == 35) {
1906                         if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1907                             av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1908                             return -1;
1909                         }
1910                         goto eos; /* end of slice */
1911                     }
1912                     /* otherwise, stuffing, nothing to do */
1913                 } else {
1914                     s->mb_skip_run += code;
1915                     break;
1916                 }
1917             }
1918             if (s->mb_skip_run) {
1919                 int i;
1920                 if (s->pict_type == AV_PICTURE_TYPE_I) {
1921                     av_log(s->avctx, AV_LOG_ERROR,
1922                            "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1923                     return -1;
1924                 }
1925
1926                 /* skip mb */
1927                 s->mb_intra = 0;
1928                 for (i = 0; i < 12; i++)
1929                     s->block_last_index[i] = -1;
1930                 if (s->picture_structure == PICT_FRAME)
1931                     s->mv_type = MV_TYPE_16X16;
1932                 else
1933                     s->mv_type = MV_TYPE_FIELD;
1934                 if (s->pict_type == AV_PICTURE_TYPE_P) {
1935                     /* if P type, zero motion vector is implied */
1936                     s->mv_dir             = MV_DIR_FORWARD;
1937                     s->mv[0][0][0]        = s->mv[0][0][1]      = 0;
1938                     s->last_mv[0][0][0]   = s->last_mv[0][0][1] = 0;
1939                     s->last_mv[0][1][0]   = s->last_mv[0][1][1] = 0;
1940                     s->field_select[0][0] = (s->picture_structure - 1) & 1;
1941                 } else {
1942                     /* if B type, reuse previous vectors and directions */
1943                     s->mv[0][0][0] = s->last_mv[0][0][0];
1944                     s->mv[0][0][1] = s->last_mv[0][0][1];
1945                     s->mv[1][0][0] = s->last_mv[1][0][0];
1946                     s->mv[1][0][1] = s->last_mv[1][0][1];
1947                 }
1948             }
1949         }
1950     }
1951 eos: // end of slice
1952     *buf += (get_bits_count(&s->gb) - 1) / 8;
1953     av_dlog(s, "y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1954     return 0;
1955 }
1956
1957 static int slice_decode_thread(AVCodecContext *c, void *arg)
1958 {
1959     MpegEncContext *s   = *(void **) arg;
1960     const uint8_t *buf  = s->gb.buffer;
1961     int mb_y            = s->start_mb_y;
1962     const int field_pic = s->picture_structure != PICT_FRAME;
1963
1964     s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
1965
1966     for (;;) {
1967         uint32_t start_code;
1968         int ret;
1969
1970         ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
1971         emms_c();
1972         av_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1973                 ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
1974                 s->start_mb_y, s->end_mb_y, s->er.error_count);
1975         if (ret < 0) {
1976             if (c->err_recognition & AV_EF_EXPLODE)
1977                 return ret;
1978             if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
1979                 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
1980                                 s->mb_x, s->mb_y,
1981                                 ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
1982         } else {
1983             ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
1984                             s->mb_x - 1, s->mb_y,
1985                             ER_AC_END | ER_DC_END | ER_MV_END);
1986         }
1987
1988         if (s->mb_y == s->end_mb_y)
1989             return 0;
1990
1991         start_code = -1;
1992         buf        = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
1993         mb_y       = (start_code - SLICE_MIN_START_CODE) << field_pic;
1994         if (s->picture_structure == PICT_BOTTOM_FIELD)
1995             mb_y++;
1996         if (mb_y < 0 || mb_y >= s->end_mb_y)
1997             return -1;
1998     }
1999 }
2000
2001 /**
2002  * Handle slice ends.
2003  * @return 1 if it seems to be the last slice
2004  */
2005 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2006 {
2007     Mpeg1Context *s1  = avctx->priv_data;
2008     MpegEncContext *s = &s1->mpeg_enc_ctx;
2009
2010     if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2011         return 0;
2012
2013     if (s->avctx->hwaccel) {
2014         if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
2015             av_log(avctx, AV_LOG_ERROR,
2016                    "hardware accelerator failed to decode picture\n");
2017     }
2018
2019 #if FF_API_XVMC
2020 FF_DISABLE_DEPRECATION_WARNINGS
2021     if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
2022         ff_xvmc_field_end(s);
2023 FF_ENABLE_DEPRECATION_WARNINGS
2024 #endif /* FF_API_XVMC */
2025
2026     /* end of slice reached */
2027     if (/* s->mb_y << field_pic == s->mb_height && */ !s->first_field) {
2028         /* end of image */
2029
2030         ff_er_frame_end(&s->er);
2031
2032         ff_mpv_frame_end(s);
2033
2034         if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
2035             int ret = av_frame_ref(pict, s->current_picture_ptr->f);
2036             if (ret < 0)
2037                 return ret;
2038             ff_print_debug_info(s, s->current_picture_ptr);
2039         } else {
2040             if (avctx->active_thread_type & FF_THREAD_FRAME)
2041                 s->picture_number++;
2042             /* latency of 1 frame for I- and P-frames */
2043             /* XXX: use another variable than picture_number */
2044             if (s->last_picture_ptr) {
2045                 int ret = av_frame_ref(pict, s->last_picture_ptr->f);
2046                 if (ret < 0)
2047                     return ret;
2048                 ff_print_debug_info(s, s->last_picture_ptr);
2049             }
2050         }
2051
2052         return 1;
2053     } else {
2054         return 0;
2055     }
2056 }
2057
2058 static int mpeg1_decode_sequence(AVCodecContext *avctx,
2059                                  const uint8_t *buf, int buf_size)
2060 {
2061     Mpeg1Context *s1  = avctx->priv_data;
2062     MpegEncContext *s = &s1->mpeg_enc_ctx;
2063     int width, height;
2064     int i, v, j;
2065
2066     init_get_bits(&s->gb, buf, buf_size * 8);
2067
2068     width  = get_bits(&s->gb, 12);
2069     height = get_bits(&s->gb, 12);
2070     if (width == 0 || height == 0) {
2071         av_log(avctx, AV_LOG_WARNING,
2072                "Invalid horizontal or vertical size value.\n");
2073         if (avctx->err_recognition & AV_EF_BITSTREAM)
2074             return AVERROR_INVALIDDATA;
2075     }
2076     s->aspect_ratio_info = get_bits(&s->gb, 4);
2077     if (s->aspect_ratio_info == 0) {
2078         av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2079         if (avctx->err_recognition & AV_EF_BITSTREAM)
2080             return -1;
2081     }
2082     s->frame_rate_index = get_bits(&s->gb, 4);
2083     if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
2084         return -1;
2085     s->bit_rate = get_bits(&s->gb, 18) * 400;
2086     if (get_bits1(&s->gb) == 0) /* marker */
2087         return -1;
2088     s->width  = width;
2089     s->height = height;
2090
2091     s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2092     skip_bits(&s->gb, 1);
2093
2094     /* get matrix */
2095     if (get_bits1(&s->gb)) {
2096         load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2097     } else {
2098         for (i = 0; i < 64; i++) {
2099             j = s->idsp.idct_permutation[i];
2100             v = ff_mpeg1_default_intra_matrix[i];
2101             s->intra_matrix[j]        = v;
2102             s->chroma_intra_matrix[j] = v;
2103         }
2104     }
2105     if (get_bits1(&s->gb)) {
2106         load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2107     } else {
2108         for (i = 0; i < 64; i++) {
2109             int j = s->idsp.idct_permutation[i];
2110             v = ff_mpeg1_default_non_intra_matrix[i];
2111             s->inter_matrix[j]        = v;
2112             s->chroma_inter_matrix[j] = v;
2113         }
2114     }
2115
2116     if (show_bits(&s->gb, 23) != 0) {
2117         av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2118         return -1;
2119     }
2120
2121     /* We set MPEG-2 parameters so that it emulates MPEG-1. */
2122     s->progressive_sequence = 1;
2123     s->progressive_frame    = 1;
2124     s->picture_structure    = PICT_FRAME;
2125     s->frame_pred_frame_dct = 1;
2126     s->chroma_format        = 1;
2127     s->codec_id             =
2128     s->avctx->codec_id      = AV_CODEC_ID_MPEG1VIDEO;
2129     s->out_format           = FMT_MPEG1;
2130     if (s->flags & CODEC_FLAG_LOW_DELAY)
2131         s->low_delay = 1;
2132
2133     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2134         av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2135                s->avctx->rc_buffer_size, s->bit_rate);
2136
2137     return 0;
2138 }
2139
2140 static int vcr2_init_sequence(AVCodecContext *avctx)
2141 {
2142     Mpeg1Context *s1  = avctx->priv_data;
2143     MpegEncContext *s = &s1->mpeg_enc_ctx;
2144     int i, v;
2145
2146     /* start new MPEG-1 context decoding */
2147     s->out_format = FMT_MPEG1;
2148     if (s1->mpeg_enc_ctx_allocated) {
2149         ff_mpv_common_end(s);
2150     }
2151     s->width            = avctx->coded_width;
2152     s->height           = avctx->coded_height;
2153     avctx->has_b_frames = 0; // true?
2154     s->low_delay        = 1;
2155
2156     avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2157
2158 #if FF_API_XVMC
2159     if ((avctx->pix_fmt == AV_PIX_FMT_XVMC_MPEG2_IDCT || avctx->hwaccel) &&
2160         avctx->idct_algo == FF_IDCT_AUTO)
2161 #else
2162     if (avctx->hwaccel && avctx->idct_algo == FF_IDCT_AUTO)
2163 #endif /* FF_API_XVMC */
2164         avctx->idct_algo = FF_IDCT_SIMPLE;
2165
2166     ff_mpv_idct_init(s);
2167     if (ff_mpv_common_init(s) < 0)
2168         return -1;
2169     s1->mpeg_enc_ctx_allocated = 1;
2170
2171     for (i = 0; i < 64; i++) {
2172         int j = s->idsp.idct_permutation[i];
2173         v = ff_mpeg1_default_intra_matrix[i];
2174         s->intra_matrix[j]        = v;
2175         s->chroma_intra_matrix[j] = v;
2176
2177         v = ff_mpeg1_default_non_intra_matrix[i];
2178         s->inter_matrix[j]        = v;
2179         s->chroma_inter_matrix[j] = v;
2180     }
2181
2182     s->progressive_sequence  = 1;
2183     s->progressive_frame     = 1;
2184     s->picture_structure     = PICT_FRAME;
2185     s->frame_pred_frame_dct  = 1;
2186     s->chroma_format         = 1;
2187     s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
2188     s1->save_width           = s->width;
2189     s1->save_height          = s->height;
2190     s1->save_progressive_seq = s->progressive_sequence;
2191     return 0;
2192 }
2193
2194 static int mpeg_decode_a53_cc(AVCodecContext *avctx,
2195                               const uint8_t *p, int buf_size)
2196 {
2197     Mpeg1Context *s1 = avctx->priv_data;
2198
2199     if (buf_size >= 6 &&
2200         p[0] == 'G' && p[1] == 'A' && p[2] == '9' && p[3] == '4' &&
2201         p[4] == 3 && (p[5] & 0x40)) {
2202         /* extract A53 Part 4 CC data */
2203         int cc_count = p[5] & 0x1f;
2204         if (cc_count > 0 && buf_size >= 7 + cc_count * 3) {
2205             av_freep(&s1->a53_caption);
2206             s1->a53_caption_size = cc_count * 3;
2207             s1->a53_caption      = av_malloc(s1->a53_caption_size);
2208             if (s1->a53_caption)
2209                 memcpy(s1->a53_caption, p + 7, s1->a53_caption_size);
2210         }
2211         return 1;
2212     } else if (buf_size >= 11 &&
2213                p[0] == 'C' && p[1] == 'C' && p[2] == 0x01 && p[3] == 0xf8) {
2214         /* extract DVD CC data */
2215         int cc_count = 0;
2216         int i;
2217         // There is a caption count field in the data, but it is often
2218         // incorect.  So count the number of captions present.
2219         for (i = 5; i + 6 <= buf_size && ((p[i] & 0xfe) == 0xfe); i += 6)
2220             cc_count++;
2221         // Transform the DVD format into A53 Part 4 format
2222         if (cc_count > 0) {
2223             av_freep(&s1->a53_caption);
2224             s1->a53_caption_size = cc_count * 6;
2225             s1->a53_caption      = av_malloc(s1->a53_caption_size);
2226             if (s1->a53_caption) {
2227                 uint8_t field1 = !!(p[4] & 0x80);
2228                 uint8_t *cap = s1->a53_caption;
2229                 p += 5;
2230                 for (i = 0; i < cc_count; i++) {
2231                     cap[0] = (p[0] == 0xff && field1) ? 0xfc : 0xfd;
2232                     cap[1] = p[1];
2233                     cap[2] = p[2];
2234                     cap[3] = (p[3] == 0xff && !field1) ? 0xfc : 0xfd;
2235                     cap[4] = p[4];
2236                     cap[5] = p[5];
2237                     cap += 6;
2238                     p += 6;
2239                 }
2240             }
2241         }
2242         return 1;
2243     }
2244     return 0;
2245 }
2246
2247 static void mpeg_decode_user_data(AVCodecContext *avctx,
2248                                   const uint8_t *p, int buf_size)
2249 {
2250     const uint8_t *buf_end = p + buf_size;
2251     Mpeg1Context *s1 = avctx->priv_data;
2252
2253     /* we parse the DTG active format information */
2254     if (buf_end - p >= 5 &&
2255         p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2256         int flags = p[4];
2257         p += 5;
2258         if (flags & 0x80) {
2259             /* skip event id */
2260             p += 2;
2261         }
2262         if (flags & 0x40) {
2263             if (buf_end - p < 1)
2264                 return;
2265 #if FF_API_AFD
2266 FF_DISABLE_DEPRECATION_WARNINGS
2267             avctx->dtg_active_format = p[0] & 0x0f;
2268 FF_ENABLE_DEPRECATION_WARNINGS
2269 #endif /* FF_API_AFD */
2270             s1->has_afd = 1;
2271             s1->afd     = p[0] & 0x0f;
2272         }
2273     } else if (buf_end - p >= 6 &&
2274                p[0] == 'J' && p[1] == 'P' && p[2] == '3' && p[3] == 'D' &&
2275                p[4] == 0x03) { // S3D_video_format_length
2276         // the 0x7F mask ignores the reserved_bit value
2277         const uint8_t S3D_video_format_type = p[5] & 0x7F;
2278
2279         if (S3D_video_format_type == 0x03 ||
2280             S3D_video_format_type == 0x04 ||
2281             S3D_video_format_type == 0x08 ||
2282             S3D_video_format_type == 0x23) {
2283
2284             s1->has_stereo3d = 1;
2285
2286             switch (S3D_video_format_type) {
2287             case 0x03:
2288                 s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE;
2289                 break;
2290             case 0x04:
2291                 s1->stereo3d.type = AV_STEREO3D_TOPBOTTOM;
2292                 break;
2293             case 0x08:
2294                 s1->stereo3d.type = AV_STEREO3D_2D;
2295                 break;
2296             case 0x23:
2297                 s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE_QUINCUNX;
2298                 break;
2299             }
2300         }
2301     } else if (mpeg_decode_a53_cc(avctx, p, buf_size)) {
2302         return;
2303     }
2304 }
2305
2306 static void mpeg_decode_gop(AVCodecContext *avctx,
2307                             const uint8_t *buf, int buf_size)
2308 {
2309     Mpeg1Context *s1  = avctx->priv_data;
2310     MpegEncContext *s = &s1->mpeg_enc_ctx;
2311
2312     int time_code_hours, time_code_minutes;
2313     int time_code_seconds, time_code_pictures;
2314     int broken_link;
2315
2316     init_get_bits(&s->gb, buf, buf_size * 8);
2317
2318     skip_bits1(&s->gb); /* drop_frame_flag */
2319
2320     time_code_hours   = get_bits(&s->gb, 5);
2321     time_code_minutes = get_bits(&s->gb, 6);
2322     skip_bits1(&s->gb); // marker bit
2323     time_code_seconds  = get_bits(&s->gb, 6);
2324     time_code_pictures = get_bits(&s->gb, 6);
2325
2326     s1->closed_gop = get_bits1(&s->gb);
2327     /* broken_link indicate that after editing the
2328      * reference frames of the first B-Frames after GOP I-Frame
2329      * are missing (open gop) */
2330     broken_link = get_bits1(&s->gb);
2331
2332     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2333         av_log(s->avctx, AV_LOG_DEBUG,
2334                "GOP (%2d:%02d:%02d.[%02d]) closed_gop=%d broken_link=%d\n",
2335                time_code_hours, time_code_minutes, time_code_seconds,
2336                time_code_pictures, s1->closed_gop, broken_link);
2337 }
2338
2339 static int decode_chunks(AVCodecContext *avctx, AVFrame *picture,
2340                          int *got_output, const uint8_t *buf, int buf_size)
2341 {
2342     Mpeg1Context *s = avctx->priv_data;
2343     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2344     const uint8_t *buf_ptr = buf;
2345     const uint8_t *buf_end = buf + buf_size;
2346     int ret, input_size;
2347     int last_code = 0, skip_frame = 0;
2348
2349     for (;;) {
2350         /* find next start code */
2351         uint32_t start_code = -1;
2352         buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
2353         if (start_code > 0x1ff) {
2354             if (!skip_frame) {
2355                 if (HAVE_THREADS &&
2356                     (avctx->active_thread_type & FF_THREAD_SLICE) &&
2357                     !avctx->hwaccel) {
2358                     int i;
2359
2360                     avctx->execute(avctx, slice_decode_thread,
2361                                    &s2->thread_context[0], NULL,
2362                                    s->slice_count, sizeof(void *));
2363                     for (i = 0; i < s->slice_count; i++)
2364                         s2->er.error_count += s2->thread_context[i]->er.error_count;
2365                 }
2366
2367                 ret = slice_end(avctx, picture);
2368                 if (ret < 0)
2369                     return ret;
2370                 else if (ret) {
2371                     // FIXME: merge with the stuff in mpeg_decode_slice
2372                     if (s2->last_picture_ptr || s2->low_delay)
2373                         *got_output = 1;
2374                 }
2375             }
2376             s2->pict_type = 0;
2377             return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2378         }
2379
2380         input_size = buf_end - buf_ptr;
2381
2382         if (avctx->debug & FF_DEBUG_STARTCODE)
2383             av_log(avctx, AV_LOG_DEBUG, "%3"PRIX32" at %td left %d\n",
2384                    start_code, buf_ptr - buf, input_size);
2385
2386         /* prepare data for next start code */
2387         switch (start_code) {
2388         case SEQ_START_CODE:
2389             if (last_code == 0) {
2390                 mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2391                 s->sync = 1;
2392             } else {
2393                 av_log(avctx, AV_LOG_ERROR,
2394                        "ignoring SEQ_START_CODE after %X\n", last_code);
2395                 if (avctx->err_recognition & AV_EF_EXPLODE)
2396                     return AVERROR_INVALIDDATA;
2397             }
2398             break;
2399
2400         case PICTURE_START_CODE:
2401             if (s2->width <= 0 || s2->height <= 0) {
2402                 av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
2403                        s2->width, s2->height);
2404                 return AVERROR_INVALIDDATA;
2405             }
2406
2407             if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
2408                 !avctx->hwaccel && s->slice_count) {
2409                 int i;
2410
2411                 avctx->execute(avctx, slice_decode_thread,
2412                                s2->thread_context, NULL,
2413                                s->slice_count, sizeof(void *));
2414                 for (i = 0; i < s->slice_count; i++)
2415                     s2->er.error_count += s2->thread_context[i]->er.error_count;
2416                 s->slice_count = 0;
2417             }
2418             if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2419                 ret = mpeg_decode_postinit(avctx);
2420                 if (ret < 0) {
2421                     av_log(avctx, AV_LOG_ERROR,
2422                            "mpeg_decode_postinit() failure\n");
2423                     return ret;
2424                 }
2425
2426                 /* We have a complete image: we try to decompress it. */
2427                 if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2428                     s2->pict_type = 0;
2429                 s->first_slice = 1;
2430                 last_code      = PICTURE_START_CODE;
2431             } else {
2432                 av_log(avctx, AV_LOG_ERROR,
2433                        "ignoring pic after %X\n", last_code);
2434                 if (avctx->err_recognition & AV_EF_EXPLODE)
2435                     return AVERROR_INVALIDDATA;
2436             }
2437             break;
2438         case EXT_START_CODE:
2439             init_get_bits(&s2->gb, buf_ptr, input_size * 8);
2440
2441             switch (get_bits(&s2->gb, 4)) {
2442             case 0x1:
2443                 if (last_code == 0) {
2444                     mpeg_decode_sequence_extension(s);
2445                 } else {
2446                     av_log(avctx, AV_LOG_ERROR,
2447                            "ignoring seq ext after %X\n", last_code);
2448                     if (avctx->err_recognition & AV_EF_EXPLODE)
2449                         return AVERROR_INVALIDDATA;
2450                 }
2451                 break;
2452             case 0x2:
2453                 mpeg_decode_sequence_display_extension(s);
2454                 break;
2455             case 0x3:
2456                 mpeg_decode_quant_matrix_extension(s2);
2457                 break;
2458             case 0x7:
2459                 mpeg_decode_picture_display_extension(s);
2460                 break;
2461             case 0x8:
2462                 if (last_code == PICTURE_START_CODE) {
2463                     mpeg_decode_picture_coding_extension(s);
2464                 } else {
2465                     av_log(avctx, AV_LOG_ERROR,
2466                            "ignoring pic cod ext after %X\n", last_code);
2467                     if (avctx->err_recognition & AV_EF_EXPLODE)
2468                         return AVERROR_INVALIDDATA;
2469                 }
2470                 break;
2471             }
2472             break;
2473         case USER_START_CODE:
2474             mpeg_decode_user_data(avctx, buf_ptr, input_size);
2475             break;
2476         case GOP_START_CODE:
2477             if (last_code == 0) {
2478                 s2->first_field = 0;
2479                 mpeg_decode_gop(avctx, buf_ptr, input_size);
2480                 s->sync = 1;
2481             } else {
2482                 av_log(avctx, AV_LOG_ERROR,
2483                        "ignoring GOP_START_CODE after %X\n", last_code);
2484                 if (avctx->err_recognition & AV_EF_EXPLODE)
2485                     return AVERROR_INVALIDDATA;
2486             }
2487             break;
2488         default:
2489             if (start_code >= SLICE_MIN_START_CODE &&
2490                 start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2491                 const int field_pic = s2->picture_structure != PICT_FRAME;
2492                 int mb_y = (start_code - SLICE_MIN_START_CODE) << field_pic;
2493                 last_code = SLICE_MIN_START_CODE;
2494
2495                 if (s2->picture_structure == PICT_BOTTOM_FIELD)
2496                     mb_y++;
2497
2498                 if (mb_y >= s2->mb_height) {
2499                     av_log(s2->avctx, AV_LOG_ERROR,
2500                            "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2501                     return -1;
2502                 }
2503
2504                 if (!s2->last_picture_ptr) {
2505                     /* Skip B-frames if we do not have reference frames and
2506                      * GOP is not closed. */
2507                     if (s2->pict_type == AV_PICTURE_TYPE_B) {
2508                         if (!s->closed_gop) {
2509                             skip_frame = 1;
2510                             break;
2511                         }
2512                     }
2513                 }
2514                 if (s2->pict_type == AV_PICTURE_TYPE_I)
2515                     s->sync = 1;
2516                 if (!s2->next_picture_ptr) {
2517                     /* Skip P-frames if we do not have a reference frame or
2518                      * we have an invalid header. */
2519                     if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
2520                         skip_frame = 1;
2521                         break;
2522                     }
2523                 }
2524                 if ((avctx->skip_frame >= AVDISCARD_NONREF &&
2525                      s2->pict_type == AV_PICTURE_TYPE_B) ||
2526                     (avctx->skip_frame >= AVDISCARD_NONKEY &&
2527                      s2->pict_type != AV_PICTURE_TYPE_I) ||
2528                     avctx->skip_frame >= AVDISCARD_ALL) {
2529                     skip_frame = 1;
2530                     break;
2531                 }
2532
2533                 if (!s->mpeg_enc_ctx_allocated)
2534                     break;
2535
2536                 if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2537                     if (mb_y < avctx->skip_top ||
2538                         mb_y >= s2->mb_height - avctx->skip_bottom)
2539                         break;
2540                 }
2541
2542                 if (!s2->pict_type) {
2543                     av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2544                     if (avctx->err_recognition & AV_EF_EXPLODE)
2545                         return AVERROR_INVALIDDATA;
2546                     break;
2547                 }
2548
2549                 if (s->first_slice) {
2550                     skip_frame     = 0;
2551                     s->first_slice = 0;
2552                     if (mpeg_field_start(s2, buf, buf_size) < 0)
2553                         return -1;
2554                 }
2555                 if (!s2->current_picture_ptr) {
2556                     av_log(avctx, AV_LOG_ERROR,
2557                            "current_picture not initialized\n");
2558                     return AVERROR_INVALIDDATA;
2559                 }
2560
2561                 if (HAVE_THREADS &&
2562                     (avctx->active_thread_type & FF_THREAD_SLICE) &&
2563                     !avctx->hwaccel) {
2564                     int threshold = (s2->mb_height * s->slice_count +
2565                                      s2->slice_context_count / 2) /
2566                                     s2->slice_context_count;
2567                     if (threshold <= mb_y) {
2568                         MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2569
2570                         thread_context->start_mb_y = mb_y;
2571                         thread_context->end_mb_y   = s2->mb_height;
2572                         if (s->slice_count) {
2573                             s2->thread_context[s->slice_count - 1]->end_mb_y = mb_y;
2574                             ret = ff_update_duplicate_context(thread_context, s2);
2575                             if (ret < 0)
2576                                 return ret;
2577                         }
2578                         init_get_bits(&thread_context->gb, buf_ptr, input_size * 8);
2579                         s->slice_count++;
2580                     }
2581                     buf_ptr += 2; // FIXME add minimum number of bytes per slice
2582                 } else {
2583                     ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2584                     emms_c();
2585
2586                     if (ret < 0) {
2587                         if (avctx->err_recognition & AV_EF_EXPLODE)
2588                             return ret;
2589                         if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2590                             ff_er_add_slice(&s2->er, s2->resync_mb_x,
2591                                             s2->resync_mb_y, s2->mb_x, s2->mb_y,
2592                                             ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2593                     } else {
2594                         ff_er_add_slice(&s2->er, s2->resync_mb_x,
2595                                         s2->resync_mb_y, s2->mb_x - 1, s2->mb_y,
2596                                         ER_AC_END | ER_DC_END | ER_MV_END);
2597                     }
2598                 }
2599             }
2600             break;
2601         }
2602     }
2603 }
2604
2605 static int mpeg_decode_frame(AVCodecContext *avctx, void *data,
2606                              int *got_output, AVPacket *avpkt)
2607 {
2608     const uint8_t *buf = avpkt->data;
2609     int buf_size = avpkt->size;
2610     Mpeg1Context *s = avctx->priv_data;
2611     AVFrame *picture = data;
2612     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2613     av_dlog(avctx, "fill_buffer\n");
2614
2615     if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2616         /* special case for last picture */
2617         if (s2->low_delay == 0 && s2->next_picture_ptr) {
2618             int ret = av_frame_ref(picture, s2->next_picture_ptr->f);
2619             if (ret < 0)
2620                 return ret;
2621
2622             s2->next_picture_ptr = NULL;
2623
2624             *got_output = 1;
2625         }
2626         return buf_size;
2627     }
2628
2629     if (s2->flags & CODEC_FLAG_TRUNCATED) {
2630         int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf,
2631                                            buf_size, NULL);
2632
2633         if (ff_combine_frame(&s2->parse_context, next,
2634                              (const uint8_t **) &buf, &buf_size) < 0)
2635             return buf_size;
2636     }
2637
2638     if (s->mpeg_enc_ctx_allocated == 0 && avctx->codec_tag == AV_RL32("VCR2"))
2639         vcr2_init_sequence(avctx);
2640
2641     s->slice_count = 0;
2642
2643     if (avctx->extradata && !s->extradata_decoded) {
2644         int ret = decode_chunks(avctx, picture, got_output,
2645                                 avctx->extradata, avctx->extradata_size);
2646         s->extradata_decoded = 1;
2647         if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
2648             return ret;
2649     }
2650
2651     return decode_chunks(avctx, picture, got_output, buf, buf_size);
2652 }
2653
2654 static void flush(AVCodecContext *avctx)
2655 {
2656     Mpeg1Context *s = avctx->priv_data;
2657
2658     s->sync       = 0;
2659     s->closed_gop = 0;
2660
2661     ff_mpeg_flush(avctx);
2662 }
2663
2664 static av_cold int mpeg_decode_end(AVCodecContext *avctx)
2665 {
2666     Mpeg1Context *s = avctx->priv_data;
2667
2668     if (s->mpeg_enc_ctx_allocated)
2669         ff_mpv_common_end(&s->mpeg_enc_ctx);
2670     av_freep(&s->a53_caption);
2671     return 0;
2672 }
2673
2674 static const AVProfile mpeg2_video_profiles[] = {
2675     { FF_PROFILE_MPEG2_422,          "4:2:2"              },
2676     { FF_PROFILE_MPEG2_HIGH,         "High"               },
2677     { FF_PROFILE_MPEG2_SS,           "Spatially Scalable" },
2678     { FF_PROFILE_MPEG2_SNR_SCALABLE, "SNR Scalable"       },
2679     { FF_PROFILE_MPEG2_MAIN,         "Main"               },
2680     { FF_PROFILE_MPEG2_SIMPLE,       "Simple"             },
2681     { FF_PROFILE_RESERVED,           "Reserved"           },
2682     { FF_PROFILE_RESERVED,           "Reserved"           },
2683     { FF_PROFILE_UNKNOWN                                  },
2684 };
2685
2686 AVCodec ff_mpeg1video_decoder = {
2687     .name                  = "mpeg1video",
2688     .long_name             = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2689     .type                  = AVMEDIA_TYPE_VIDEO,
2690     .id                    = AV_CODEC_ID_MPEG1VIDEO,
2691     .priv_data_size        = sizeof(Mpeg1Context),
2692     .init                  = mpeg_decode_init,
2693     .close                 = mpeg_decode_end,
2694     .decode                = mpeg_decode_frame,
2695     .capabilities          = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2696                              CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2697                              CODEC_CAP_SLICE_THREADS,
2698     .flush                 = flush,
2699     .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context)
2700 };
2701
2702 AVCodec ff_mpeg2video_decoder = {
2703     .name           = "mpeg2video",
2704     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2705     .type           = AVMEDIA_TYPE_VIDEO,
2706     .id             = AV_CODEC_ID_MPEG2VIDEO,
2707     .priv_data_size = sizeof(Mpeg1Context),
2708     .init           = mpeg_decode_init,
2709     .close          = mpeg_decode_end,
2710     .decode         = mpeg_decode_frame,
2711     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2712                       CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2713                       CODEC_CAP_SLICE_THREADS,
2714     .flush          = flush,
2715     .profiles       = NULL_IF_CONFIG_SMALL(mpeg2_video_profiles),
2716 };
2717
2718 #if FF_API_XVMC
2719 #if CONFIG_MPEG_XVMC_DECODER
2720 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx)
2721 {
2722     if (avctx->active_thread_type & FF_THREAD_SLICE)
2723         return -1;
2724     if (!(avctx->slice_flags & SLICE_FLAG_CODED_ORDER))
2725         return -1;
2726     if (!(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
2727         av_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2728     }
2729     mpeg_decode_init(avctx);
2730
2731     avctx->pix_fmt           = AV_PIX_FMT_XVMC_MPEG2_IDCT;
2732     avctx->xvmc_acceleration = 2; // 2 - the blocks are packed!
2733
2734     return 0;
2735 }
2736
2737 AVCodec ff_mpeg_xvmc_decoder = {
2738     .name           = "mpegvideo_xvmc",
2739     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2740     .type           = AVMEDIA_TYPE_VIDEO,
2741     .id             = AV_CODEC_ID_MPEG2VIDEO_XVMC,
2742     .priv_data_size = sizeof(Mpeg1Context),
2743     .init           = mpeg_mc_decode_init,
2744     .close          = mpeg_decode_end,
2745     .decode         = mpeg_decode_frame,
2746     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2747                       CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2748     .flush          = flush,
2749 };
2750
2751 #endif
2752 #endif /* FF_API_XVMC */