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   1 /*
   2  * MPEG-1/2 decoder
   3  * Copyright (c) 2000, 2001 Fabrice Bellard
   4  * Copyright (c) 2002-2013 Michael Niedermayer <michaelni@gmx.at>
   5  *
   6  * This file is part of FFmpeg.
   7  *
   8  * FFmpeg is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * FFmpeg is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with FFmpeg; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 /**
  24  * @file
  25  * MPEG-1/2 decoder
  26  */
  27
  28 #define UNCHECKED_BITSTREAM_READER 1
  29 #include <inttypes.h>
  30
  31 #include "libavutil/attributes.h"
  32 #include "libavutil/internal.h"
  33 #include "libavutil/stereo3d.h"
  34
  35 #include "avcodec.h"
  36 #include "bytestream.h"
  37 #include "error_resilience.h"
  38 #include "idctdsp.h"
  39 #include "internal.h"
  40 #include "mpeg_er.h"
  41 #include "mpeg12.h"
  42 #include "mpeg12data.h"
  43 #include "mpegutils.h"
  44 #include "mpegvideo.h"
  45 #include "thread.h"
  46 #include "version.h"
  47 #include "vdpau_internal.h"
  48 #include "xvmc_internal.h"
  49
  50 typedef struct Mpeg1Context {
  51     MpegEncContext mpeg_enc_ctx;
  52     int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
  53     int repeat_field;           /* true if we must repeat the field */
  54     AVPanScan pan_scan;         /* some temporary storage for the panscan */
  55     AVStereo3D stereo3d;
  56     int has_stereo3d;
  57     uint8_t *a53_caption;
  58     int a53_caption_size;
  59     uint8_t afd;
  60     int has_afd;
  61     int slice_count;
  62     int save_aspect_info;
  63     int save_width, save_height, save_progressive_seq;
  64     AVRational frame_rate_ext;  /* MPEG-2 specific framerate modificator */
  65     int sync;                   /* Did we reach a sync point like a GOP/SEQ/KEYFrame? */
  66     int tmpgexs;
  67     int first_slice;
  68     int extradata_decoded;
  69 } Mpeg1Context;
  70
  71 #define MB_TYPE_ZERO_MV   0x20000000
  72
  73 static const uint32_t ptype2mb_type[7] = {
  74                     MB_TYPE_INTRA,
  75                     MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
  76                     MB_TYPE_L0,
  77                     MB_TYPE_L0 | MB_TYPE_CBP,
  78     MB_TYPE_QUANT | MB_TYPE_INTRA,
  79     MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
  80     MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
  81 };
  82
  83 static const uint32_t btype2mb_type[11] = {
  84                     MB_TYPE_INTRA,
  85                     MB_TYPE_L1,
  86                     MB_TYPE_L1   | MB_TYPE_CBP,
  87                     MB_TYPE_L0,
  88                     MB_TYPE_L0   | MB_TYPE_CBP,
  89                     MB_TYPE_L0L1,
  90                     MB_TYPE_L0L1 | MB_TYPE_CBP,
  91     MB_TYPE_QUANT | MB_TYPE_INTRA,
  92     MB_TYPE_QUANT | MB_TYPE_L1   | MB_TYPE_CBP,
  93     MB_TYPE_QUANT | MB_TYPE_L0   | MB_TYPE_CBP,
  94     MB_TYPE_QUANT | MB_TYPE_L0L1 | MB_TYPE_CBP,
  95 };
  96
  97 static const uint8_t non_linear_qscale[32] = {
  98      0,  1,  2,  3,  4,  5,   6,   7,
  99      8, 10, 12, 14, 16, 18,  20,  22,
 100     24, 28, 32, 36, 40, 44,  48,  52,
 101     56, 64, 72, 80, 88, 96, 104, 112,
 102 };
 103
 104 /* as H.263, but only 17 codes */
 105 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
 106 {
 107     int code, sign, val, shift;
 108
 109     code = get_vlc2(&s->gb, ff_mv_vlc.table, MV_VLC_BITS, 2);
 110     if (code == 0)
 111         return pred;
 112     if (code < 0)
 113         return 0xffff;
 114
 115     sign  = get_bits1(&s->gb);
 116     shift = fcode - 1;
 117     val   = code;
 118     if (shift) {
 119         val  = (val - 1) << shift;
 120         val |= get_bits(&s->gb, shift);
 121         val++;
 122     }
 123     if (sign)
 124         val = -val;
 125     val += pred;
 126
 127     /* modulo decoding */
 128     return sign_extend(val, 5 + shift);
 129 }
 130
 131 #define check_scantable_index(ctx, x)                                         \
 132     do {                                                                      \
 133         if ((x) > 63) {                                                       \
 134             av_log(ctx->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n",     \
 135                    ctx->mb_x, ctx->mb_y);                                     \
 136             return AVERROR_INVALIDDATA;                                       \
 137         }                                                                     \
 138     } while (0)
 139
 140 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
 141                                            int16_t *block, int n)
 142 {
 143     int level, dc, diff, i, j, run;
 144     int component;
 145     RLTable *rl                  = &ff_rl_mpeg1;
 146     uint8_t *const scantable     = s->intra_scantable.permutated;
 147     const uint16_t *quant_matrix = s->intra_matrix;
 148     const int qscale             = s->qscale;
 149
 150     /* DC coefficient */
 151     component = (n <= 3 ? 0 : n - 4 + 1);
 152     diff = decode_dc(&s->gb, component);
 153     if (diff >= 0xffff)
 154         return -1;
 155     dc  = s->last_dc[component];
 156     dc += diff;
 157     s->last_dc[component] = dc;
 158     block[0] = dc * quant_matrix[0];
 159     av_dlog(s->avctx, "dc=%d diff=%d\n", dc, diff);
 160     i = 0;
 161     {
 162         OPEN_READER(re, &s->gb);
 163         UPDATE_CACHE(re, &s->gb);
 164         if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
 165             goto end;
 166
 167         /* now quantify & encode AC coefficients */
 168         for (;;) {
 169             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
 170                        TEX_VLC_BITS, 2, 0);
 171
 172             if (level != 0) {
 173                 i += run;
 174                 check_scantable_index(s, i);
 175                 j = scantable[i];
 176                 level = (level * qscale * quant_matrix[j]) >> 4;
 177                 level = (level - 1) | 1;
 178                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
 179                         SHOW_SBITS(re, &s->gb, 1);
 180                 SKIP_BITS(re, &s->gb, 1);
 181             } else {
 182                 /* escape */
 183                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
 184                 LAST_SKIP_BITS(re, &s->gb, 6);
 185                 UPDATE_CACHE(re, &s->gb);
 186                 level = SHOW_SBITS(re, &s->gb, 8);
 187                 SKIP_BITS(re, &s->gb, 8);
 188                 if (level == -128) {
 189                     level = SHOW_UBITS(re, &s->gb, 8) - 256;
 190                     SKIP_BITS(re, &s->gb, 8);
 191                 } else if (level == 0) {
 192                     level = SHOW_UBITS(re, &s->gb, 8);
 193                     SKIP_BITS(re, &s->gb, 8);
 194                 }
 195                 i += run;
 196                 check_scantable_index(s, i);
 197                 j = scantable[i];
 198                 if (level < 0) {
 199                     level = -level;
 200                     level = (level * qscale * quant_matrix[j]) >> 4;
 201                     level = (level - 1) | 1;
 202                     level = -level;
 203                 } else {
 204                     level = (level * qscale * quant_matrix[j]) >> 4;
 205                     level = (level - 1) | 1;
 206                 }
 207             }
 208
 209             block[j] = level;
 210             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
 211                break;
 212
 213             UPDATE_CACHE(re, &s->gb);
 214         }
 215 end:
 216         LAST_SKIP_BITS(re, &s->gb, 2);
 217         CLOSE_READER(re, &s->gb);
 218     }
 219     s->block_last_index[n] = i;
 220     return 0;
 221 }
 222
 223 int ff_mpeg1_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
 224 {
 225     return mpeg1_decode_block_intra(s, block, n);
 226 }
 227
 228 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
 229                                            int16_t *block, int n)
 230 {
 231     int level, i, j, run;
 232     RLTable *rl                  = &ff_rl_mpeg1;
 233     uint8_t *const scantable     = s->intra_scantable.permutated;
 234     const uint16_t *quant_matrix = s->inter_matrix;
 235     const int qscale             = s->qscale;
 236
 237     {
 238         OPEN_READER(re, &s->gb);
 239         i = -1;
 240         // special case for first coefficient, no need to add second VLC table
 241         UPDATE_CACHE(re, &s->gb);
 242         if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
 243             level = (3 * qscale * quant_matrix[0]) >> 5;
 244             level = (level - 1) | 1;
 245             if (GET_CACHE(re, &s->gb) & 0x40000000)
 246                 level = -level;
 247             block[0] = level;
 248             i++;
 249             SKIP_BITS(re, &s->gb, 2);
 250             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
 251                 goto end;
 252         }
 253         /* now quantify & encode AC coefficients */
 254         for (;;) {
 255             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
 256                        TEX_VLC_BITS, 2, 0);
 257
 258             if (level != 0) {
 259                 i += run;
 260                 check_scantable_index(s, i);
 261                 j = scantable[i];
 262                 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 263                 level = (level - 1) | 1;
 264                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
 265                         SHOW_SBITS(re, &s->gb, 1);
 266                 SKIP_BITS(re, &s->gb, 1);
 267             } else {
 268                 /* escape */
 269                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
 270                 LAST_SKIP_BITS(re, &s->gb, 6);
 271                 UPDATE_CACHE(re, &s->gb);
 272                 level = SHOW_SBITS(re, &s->gb, 8);
 273                 SKIP_BITS(re, &s->gb, 8);
 274                 if (level == -128) {
 275                     level = SHOW_UBITS(re, &s->gb, 8) - 256;
 276                     SKIP_BITS(re, &s->gb, 8);
 277                 } else if (level == 0) {
 278                     level = SHOW_UBITS(re, &s->gb, 8);
 279                     SKIP_BITS(re, &s->gb, 8);
 280                 }
 281                 i += run;
 282                 check_scantable_index(s, i);
 283                 j = scantable[i];
 284                 if (level < 0) {
 285                     level = -level;
 286                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 287                     level = (level - 1) | 1;
 288                     level = -level;
 289                 } else {
 290                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 291                     level = (level - 1) | 1;
 292                 }
 293             }
 294
 295             block[j] = level;
 296             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
 297                 break;
 298             UPDATE_CACHE(re, &s->gb);
 299         }
 300 end:
 301         LAST_SKIP_BITS(re, &s->gb, 2);
 302         CLOSE_READER(re, &s->gb);
 303     }
 304     s->block_last_index[n] = i;
 305     return 0;
 306 }
 307
 308 /**
 309  * Note: this function can read out of range and crash for corrupt streams.
 310  * Changing this would eat up any speed benefits it has.
 311  * Do not use "fast" flag if you need the code to be robust.
 312  */
 313 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s,
 314                                                 int16_t *block, int n)
 315 {
 316     int level, i, j, run;
 317     RLTable *rl              = &ff_rl_mpeg1;
 318     uint8_t *const scantable = s->intra_scantable.permutated;
 319     const int qscale         = s->qscale;
 320
 321     {
 322         OPEN_READER(re, &s->gb);
 323         i = -1;
 324         // Special case for first coefficient, no need to add second VLC table.
 325         UPDATE_CACHE(re, &s->gb);
 326         if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
 327             level = (3 * qscale) >> 1;
 328             level = (level - 1) | 1;
 329             if (GET_CACHE(re, &s->gb) & 0x40000000)
 330                 level = -level;
 331             block[0] = level;
 332             i++;
 333             SKIP_BITS(re, &s->gb, 2);
 334             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
 335                 goto end;
 336         }
 337
 338         /* now quantify & encode AC coefficients */
 339         for (;;) {
 340             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
 341                        TEX_VLC_BITS, 2, 0);
 342
 343             if (level != 0) {
 344                 i += run;
 345                 check_scantable_index(s, i);
 346                 j = scantable[i];
 347                 level = ((level * 2 + 1) * qscale) >> 1;
 348                 level = (level - 1) | 1;
 349                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
 350                         SHOW_SBITS(re, &s->gb, 1);
 351                 SKIP_BITS(re, &s->gb, 1);
 352             } else {
 353                 /* escape */
 354                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
 355                 LAST_SKIP_BITS(re, &s->gb, 6);
 356                 UPDATE_CACHE(re, &s->gb);
 357                 level = SHOW_SBITS(re, &s->gb, 8);
 358                 SKIP_BITS(re, &s->gb, 8);
 359                 if (level == -128) {
 360                     level = SHOW_UBITS(re, &s->gb, 8) - 256;
 361                     SKIP_BITS(re, &s->gb, 8);
 362                 } else if (level == 0) {
 363                     level = SHOW_UBITS(re, &s->gb, 8);
 364                     SKIP_BITS(re, &s->gb, 8);
 365                 }
 366                 i += run;
 367                 check_scantable_index(s, i);
 368                 j = scantable[i];
 369                 if (level < 0) {
 370                     level = -level;
 371                     level = ((level * 2 + 1) * qscale) >> 1;
 372                     level = (level - 1) | 1;
 373                     level = -level;
 374                 } else {
 375                     level = ((level * 2 + 1) * qscale) >> 1;
 376                     level = (level - 1) | 1;
 377                 }
 378             }
 379
 380             block[j] = level;
 381             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
 382                 break;
 383             UPDATE_CACHE(re, &s->gb);
 384         }
 385 end:
 386         LAST_SKIP_BITS(re, &s->gb, 2);
 387         CLOSE_READER(re, &s->gb);
 388     }
 389     s->block_last_index[n] = i;
 390     return 0;
 391 }
 392
 393 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
 394                                                int16_t *block, int n)
 395 {
 396     int level, i, j, run;
 397     RLTable *rl = &ff_rl_mpeg1;
 398     uint8_t *const scantable = s->intra_scantable.permutated;
 399     const uint16_t *quant_matrix;
 400     const int qscale = s->qscale;
 401     int mismatch;
 402
 403     mismatch = 1;
 404
 405     {
 406         OPEN_READER(re, &s->gb);
 407         i = -1;
 408         if (n < 4)
 409             quant_matrix = s->inter_matrix;
 410         else
 411             quant_matrix = s->chroma_inter_matrix;
 412
 413         // Special case for first coefficient, no need to add second VLC table.
 414         UPDATE_CACHE(re, &s->gb);
 415         if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
 416             level = (3 * qscale * quant_matrix[0]) >> 5;
 417             if (GET_CACHE(re, &s->gb) & 0x40000000)
 418                 level = -level;
 419             block[0]  = level;
 420             mismatch ^= level;
 421             i++;
 422             SKIP_BITS(re, &s->gb, 2);
 423             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
 424                 goto end;
 425         }
 426
 427         /* now quantify & encode AC coefficients */
 428         for (;;) {
 429             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
 430                        TEX_VLC_BITS, 2, 0);
 431
 432             if (level != 0) {
 433                 i += run;
 434                 check_scantable_index(s, i);
 435                 j = scantable[i];
 436                 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 437                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
 438                         SHOW_SBITS(re, &s->gb, 1);
 439                 SKIP_BITS(re, &s->gb, 1);
 440             } else {
 441                 /* escape */
 442                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
 443                 LAST_SKIP_BITS(re, &s->gb, 6);
 444                 UPDATE_CACHE(re, &s->gb);
 445                 level = SHOW_SBITS(re, &s->gb, 12);
 446                 SKIP_BITS(re, &s->gb, 12);
 447
 448                 i += run;
 449                 check_scantable_index(s, i);
 450                 j = scantable[i];
 451                 if (level < 0) {
 452                     level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 453                     level = -level;
 454                 } else {
 455                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 456                 }
 457             }
 458
 459             mismatch ^= level;
 460             block[j]  = level;
 461             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
 462                 break;
 463             UPDATE_CACHE(re, &s->gb);
 464         }
 465 end:
 466         LAST_SKIP_BITS(re, &s->gb, 2);
 467         CLOSE_READER(re, &s->gb);
 468     }
 469     block[63] ^= (mismatch & 1);
 470
 471     s->block_last_index[n] = i;
 472     return 0;
 473 }
 474
 475 /**
 476  * Note: this function can read out of range and crash for corrupt streams.
 477  * Changing this would eat up any speed benefits it has.
 478  * Do not use "fast" flag if you need the code to be robust.
 479  */
 480 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
 481                                                     int16_t *block, int n)
 482 {
 483     int level, i, j, run;
 484     RLTable *rl              = &ff_rl_mpeg1;
 485     uint8_t *const scantable = s->intra_scantable.permutated;
 486     const int qscale         = s->qscale;
 487     OPEN_READER(re, &s->gb);
 488     i = -1;
 489
 490     // special case for first coefficient, no need to add second VLC table
 491     UPDATE_CACHE(re, &s->gb);
 492     if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
 493         level = (3 * qscale) >> 1;
 494         if (GET_CACHE(re, &s->gb) & 0x40000000)
 495             level = -level;
 496         block[0] = level;
 497         i++;
 498         SKIP_BITS(re, &s->gb, 2);
 499         if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
 500             goto end;
 501     }
 502
 503     /* now quantify & encode AC coefficients */
 504     for (;;) {
 505         GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
 506
 507         if (level != 0) {
 508             i += run;
 509             j = scantable[i];
 510             level = ((level * 2 + 1) * qscale) >> 1;
 511             level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
 512                     SHOW_SBITS(re, &s->gb, 1);
 513             SKIP_BITS(re, &s->gb, 1);
 514         } else {
 515             /* escape */
 516             run = SHOW_UBITS(re, &s->gb, 6) + 1;
 517             LAST_SKIP_BITS(re, &s->gb, 6);
 518             UPDATE_CACHE(re, &s->gb);
 519             level = SHOW_SBITS(re, &s->gb, 12);
 520             SKIP_BITS(re, &s->gb, 12);
 521
 522             i += run;
 523             j = scantable[i];
 524             if (level < 0) {
 525                 level = ((-level * 2 + 1) * qscale) >> 1;
 526                 level = -level;
 527             } else {
 528                 level = ((level * 2 + 1) * qscale) >> 1;
 529             }
 530         }
 531
 532         block[j] = level;
 533         if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF || i > 63)
 534             break;
 535
 536         UPDATE_CACHE(re, &s->gb);
 537     }
 538 end:
 539     LAST_SKIP_BITS(re, &s->gb, 2);
 540     CLOSE_READER(re, &s->gb);
 541     s->block_last_index[n] = i;
 542     return 0;
 543 }
 544
 545 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
 546                                            int16_t *block, int n)
 547 {
 548     int level, dc, diff, i, j, run;
 549     int component;
 550     RLTable *rl;
 551     uint8_t *const scantable = s->intra_scantable.permutated;
 552     const uint16_t *quant_matrix;
 553     const int qscale = s->qscale;
 554     int mismatch;
 555
 556     /* DC coefficient */
 557     if (n < 4) {
 558         quant_matrix = s->intra_matrix;
 559         component    = 0;
 560     } else {
 561         quant_matrix = s->chroma_intra_matrix;
 562         component    = (n & 1) + 1;
 563     }
 564     diff = decode_dc(&s->gb, component);
 565     if (diff >= 0xffff)
 566         return -1;
 567     dc  = s->last_dc[component];
 568     dc += diff;
 569     s->last_dc[component] = dc;
 570     block[0] = dc << (3 - s->intra_dc_precision);
 571     av_dlog(s->avctx, "dc=%d\n", block[0]);
 572     mismatch = block[0] ^ 1;
 573     i = 0;
 574     if (s->intra_vlc_format)
 575         rl = &ff_rl_mpeg2;
 576     else
 577         rl = &ff_rl_mpeg1;
 578
 579     {
 580         OPEN_READER(re, &s->gb);
 581         /* now quantify & encode AC coefficients */
 582         for (;;) {
 583             UPDATE_CACHE(re, &s->gb);
 584             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
 585                        TEX_VLC_BITS, 2, 0);
 586
 587             if (level == 127) {
 588                 break;
 589             } else if (level != 0) {
 590                 i += run;
 591                 check_scantable_index(s, i);
 592                 j = scantable[i];
 593                 level = (level * qscale * quant_matrix[j]) >> 4;
 594                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
 595                         SHOW_SBITS(re, &s->gb, 1);
 596                 LAST_SKIP_BITS(re, &s->gb, 1);
 597             } else {
 598                 /* escape */
 599                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
 600                 LAST_SKIP_BITS(re, &s->gb, 6);
 601                 UPDATE_CACHE(re, &s->gb);
 602                 level = SHOW_SBITS(re, &s->gb, 12);
 603                 SKIP_BITS(re, &s->gb, 12);
 604                 i += run;
 605                 check_scantable_index(s, i);
 606                 j = scantable[i];
 607                 if (level < 0) {
 608                     level = (-level * qscale * quant_matrix[j]) >> 4;
 609                     level = -level;
 610                 } else {
 611                     level = (level * qscale * quant_matrix[j]) >> 4;
 612                 }
 613             }
 614
 615             mismatch ^= level;
 616             block[j]  = level;
 617         }
 618         CLOSE_READER(re, &s->gb);
 619     }
 620     block[63] ^= mismatch & 1;
 621
 622     s->block_last_index[n] = i;
 623     return 0;
 624 }
 625
 626 /**
 627  * Note: this function can read out of range and crash for corrupt streams.
 628  * Changing this would eat up any speed benefits it has.
 629  * Do not use "fast" flag if you need the code to be robust.
 630  */
 631 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
 632                                                 int16_t *block, int n)
 633 {
 634     int level, dc, diff, i, j, run;
 635     int component;
 636     RLTable *rl;
 637     uint8_t *const scantable = s->intra_scantable.permutated;
 638     const uint16_t *quant_matrix;
 639     const int qscale = s->qscale;
 640
 641     /* DC coefficient */
 642     if (n < 4) {
 643         quant_matrix = s->intra_matrix;
 644         component    = 0;
 645     } else {
 646         quant_matrix = s->chroma_intra_matrix;
 647         component    = (n & 1) + 1;
 648     }
 649     diff = decode_dc(&s->gb, component);
 650     if (diff >= 0xffff)
 651         return -1;
 652     dc = s->last_dc[component];
 653     dc += diff;
 654     s->last_dc[component] = dc;
 655     block[0] = dc << (3 - s->intra_dc_precision);
 656     i = 0;
 657     if (s->intra_vlc_format)
 658         rl = &ff_rl_mpeg2;
 659     else
 660         rl = &ff_rl_mpeg1;
 661
 662     {
 663         OPEN_READER(re, &s->gb);
 664         /* now quantify & encode AC coefficients */
 665         for (;;) {
 666             UPDATE_CACHE(re, &s->gb);
 667             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
 668                        TEX_VLC_BITS, 2, 0);
 669
 670             if (level >= 64 || i > 63) {
 671                 break;
 672             } else if (level != 0) {
 673                 i += run;
 674                 j = scantable[i];
 675                 level = (level * qscale * quant_matrix[j]) >> 4;
 676                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
 677                         SHOW_SBITS(re, &s->gb, 1);
 678                 LAST_SKIP_BITS(re, &s->gb, 1);
 679             } else {
 680                 /* escape */
 681                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
 682                 LAST_SKIP_BITS(re, &s->gb, 6);
 683                 UPDATE_CACHE(re, &s->gb);
 684                 level = SHOW_SBITS(re, &s->gb, 12);
 685                 SKIP_BITS(re, &s->gb, 12);
 686                 i += run;
 687                 j = scantable[i];
 688                 if (level < 0) {
 689                     level = (-level * qscale * quant_matrix[j]) >> 4;
 690                     level = -level;
 691                 } else {
 692                     level = (level * qscale * quant_matrix[j]) >> 4;
 693                 }
 694             }
 695
 696             block[j] = level;
 697         }
 698         CLOSE_READER(re, &s->gb);
 699     }
 700
 701     s->block_last_index[n] = i;
 702     return 0;
 703 }
 704
 705 /******************************************/
 706 /* decoding */
 707
 708 static inline int get_dmv(MpegEncContext *s)
 709 {
 710     if (get_bits1(&s->gb))
 711         return 1 - (get_bits1(&s->gb) << 1);
 712     else
 713         return 0;
 714 }
 715
 716 static inline int get_qscale(MpegEncContext *s)
 717 {
 718     int qscale = get_bits(&s->gb, 5);
 719     if (s->q_scale_type)
 720         return non_linear_qscale[qscale];
 721     else
 722         return qscale << 1;
 723 }
 724
 725
 726 /* motion type (for MPEG-2) */
 727 #define MT_FIELD 1
 728 #define MT_FRAME 2
 729 #define MT_16X8  2
 730 #define MT_DMV   3
 731
 732 static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
 733 {
 734     int i, j, k, cbp, val, mb_type, motion_type;
 735     const int mb_block_count = 4 + (1 << s->chroma_format);
 736     int ret;
 737
 738     av_dlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
 739
 740     av_assert2(s->mb_skipped == 0);
 741
 742     if (s->mb_skip_run-- != 0) {
 743         if (s->pict_type == AV_PICTURE_TYPE_P) {
 744             s->mb_skipped = 1;
 745             s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
 746                 MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
 747         } else {
 748             int mb_type;
 749
 750             if (s->mb_x)
 751                 mb_type = s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
 752             else
 753                 // FIXME not sure if this is allowed in MPEG at all
 754                 mb_type = s->current_picture.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1];
 755             if (IS_INTRA(mb_type)) {
 756                 av_log(s->avctx, AV_LOG_ERROR, "skip with previntra\n");
 757                 return AVERROR_INVALIDDATA;
 758             }
 759             s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
 760                 mb_type | MB_TYPE_SKIP;
 761
 762             if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
 763                 s->mb_skipped = 1;
 764         }
 765
 766         return 0;
 767     }
 768
 769     switch (s->pict_type) {
 770     default:
 771     case AV_PICTURE_TYPE_I:
 772         if (get_bits1(&s->gb) == 0) {
 773             if (get_bits1(&s->gb) == 0) {
 774                 av_log(s->avctx, AV_LOG_ERROR,
 775                        "invalid mb type in I Frame at %d %d\n",
 776                        s->mb_x, s->mb_y);
 777                 return AVERROR_INVALIDDATA;
 778             }
 779             mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
 780         } else {
 781             mb_type = MB_TYPE_INTRA;
 782         }
 783         break;
 784     case AV_PICTURE_TYPE_P:
 785         mb_type = get_vlc2(&s->gb, ff_mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
 786         if (mb_type < 0) {
 787             av_log(s->avctx, AV_LOG_ERROR,
 788                    "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
 789             return AVERROR_INVALIDDATA;
 790         }
 791         mb_type = ptype2mb_type[mb_type];
 792         break;
 793     case AV_PICTURE_TYPE_B:
 794         mb_type = get_vlc2(&s->gb, ff_mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
 795         if (mb_type < 0) {
 796             av_log(s->avctx, AV_LOG_ERROR,
 797                    "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
 798             return AVERROR_INVALIDDATA;
 799         }
 800         mb_type = btype2mb_type[mb_type];
 801         break;
 802     }
 803     av_dlog(s->avctx, "mb_type=%x\n", mb_type);
 804 //    motion_type = 0; /* avoid warning */
 805     if (IS_INTRA(mb_type)) {
 806         s->bdsp.clear_blocks(s->block[0]);
 807
 808         if (!s->chroma_y_shift)
 809             s->bdsp.clear_blocks(s->block[6]);
 810
 811         /* compute DCT type */
 812         // FIXME: add an interlaced_dct coded var?
 813         if (s->picture_structure == PICT_FRAME &&
 814             !s->frame_pred_frame_dct)
 815             s->interlaced_dct = get_bits1(&s->gb);
 816
 817         if (IS_QUANT(mb_type))
 818             s->qscale = get_qscale(s);
 819
 820         if (s->concealment_motion_vectors) {
 821             /* just parse them */
 822             if (s->picture_structure != PICT_FRAME)
 823                 skip_bits1(&s->gb);  /* field select */
 824
 825             s->mv[0][0][0]      =
 826             s->last_mv[0][0][0] =
 827             s->last_mv[0][1][0] = mpeg_decode_motion(s, s->mpeg_f_code[0][0],
 828                                                      s->last_mv[0][0][0]);
 829             s->mv[0][0][1]      =
 830             s->last_mv[0][0][1] =
 831             s->last_mv[0][1][1] = mpeg_decode_motion(s, s->mpeg_f_code[0][1],
 832                                                      s->last_mv[0][0][1]);
 833
 834             skip_bits1(&s->gb); /* marker */
 835         } else {
 836             /* reset mv prediction */
 837             memset(s->last_mv, 0, sizeof(s->last_mv));
 838         }
 839         s->mb_intra = 1;
 840         // if 1, we memcpy blocks in xvmcvideo
 841         if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
 842             ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
 843
 844         if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
 845             if (s->flags2 & CODEC_FLAG2_FAST) {
 846                 for (i = 0; i < 6; i++)
 847                     mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
 848             } else {
 849                 for (i = 0; i < mb_block_count; i++)
 850                     if ((ret = mpeg2_decode_block_intra(s, *s->pblocks[i], i)) < 0)
 851                         return ret;
 852             }
 853         } else {
 854             for (i = 0; i < 6; i++)
 855                 if ((ret = mpeg1_decode_block_intra(s, *s->pblocks[i], i)) < 0)
 856                     return ret;
 857         }
 858     } else {
 859         if (mb_type & MB_TYPE_ZERO_MV) {
 860             av_assert2(mb_type & MB_TYPE_CBP);
 861
 862             s->mv_dir = MV_DIR_FORWARD;
 863             if (s->picture_structure == PICT_FRAME) {
 864                 if (s->picture_structure == PICT_FRAME
 865                     && !s->frame_pred_frame_dct)
 866                     s->interlaced_dct = get_bits1(&s->gb);
 867                 s->mv_type = MV_TYPE_16X16;
 868             } else {
 869                 s->mv_type            = MV_TYPE_FIELD;
 870                 mb_type              |= MB_TYPE_INTERLACED;
 871                 s->field_select[0][0] = s->picture_structure - 1;
 872             }
 873
 874             if (IS_QUANT(mb_type))
 875                 s->qscale = get_qscale(s);
 876
 877             s->last_mv[0][0][0] = 0;
 878             s->last_mv[0][0][1] = 0;
 879             s->last_mv[0][1][0] = 0;
 880             s->last_mv[0][1][1] = 0;
 881             s->mv[0][0][0]      = 0;
 882             s->mv[0][0][1]      = 0;
 883         } else {
 884             av_assert2(mb_type & MB_TYPE_L0L1);
 885             // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
 886             /* get additional motion vector type */
 887             if (s->picture_structure == PICT_FRAME && s->frame_pred_frame_dct) {
 888                 motion_type = MT_FRAME;
 889             } else {
 890                 motion_type = get_bits(&s->gb, 2);
 891                 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
 892                     s->interlaced_dct = get_bits1(&s->gb);
 893             }
 894
 895             if (IS_QUANT(mb_type))
 896                 s->qscale = get_qscale(s);
 897
 898             /* motion vectors */
 899             s->mv_dir = (mb_type >> 13) & 3;
 900             av_dlog(s->avctx, "motion_type=%d\n", motion_type);
 901             switch (motion_type) {
 902             case MT_FRAME: /* or MT_16X8 */
 903                 if (s->picture_structure == PICT_FRAME) {
 904                     mb_type   |= MB_TYPE_16x16;
 905                     s->mv_type = MV_TYPE_16X16;
 906                     for (i = 0; i < 2; i++) {
 907                         if (USES_LIST(mb_type, i)) {
 908                             /* MT_FRAME */
 909                             s->mv[i][0][0]      =
 910                             s->last_mv[i][0][0] =
 911                             s->last_mv[i][1][0] =
 912                                 mpeg_decode_motion(s, s->mpeg_f_code[i][0],
 913                                                    s->last_mv[i][0][0]);
 914                             s->mv[i][0][1]      =
 915                             s->last_mv[i][0][1] =
 916                             s->last_mv[i][1][1] =
 917                                 mpeg_decode_motion(s, s->mpeg_f_code[i][1],
 918                                                    s->last_mv[i][0][1]);
 919                             /* full_pel: only for MPEG-1 */
 920                             if (s->full_pel[i]) {
 921                                 s->mv[i][0][0] <<= 1;
 922                                 s->mv[i][0][1] <<= 1;
 923                             }
 924                         }
 925                     }
 926                 } else {
 927                     mb_type   |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
 928                     s->mv_type = MV_TYPE_16X8;
 929                     for (i = 0; i < 2; i++) {
 930                         if (USES_LIST(mb_type, i)) {
 931                             /* MT_16X8 */
 932                             for (j = 0; j < 2; j++) {
 933                                 s->field_select[i][j] = get_bits1(&s->gb);
 934                                 for (k = 0; k < 2; k++) {
 935                                     val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
 936                                                              s->last_mv[i][j][k]);
 937                                     s->last_mv[i][j][k] = val;
 938                                     s->mv[i][j][k]      = val;
 939                                 }
 940                             }
 941                         }
 942                     }
 943                 }
 944                 break;
 945             case MT_FIELD:
 946                 s->mv_type = MV_TYPE_FIELD;
 947                 if (s->picture_structure == PICT_FRAME) {
 948                     mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
 949                     for (i = 0; i < 2; i++) {
 950                         if (USES_LIST(mb_type, i)) {
 951                             for (j = 0; j < 2; j++) {
 952                                 s->field_select[i][j] = get_bits1(&s->gb);
 953                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
 954                                                          s->last_mv[i][j][0]);
 955                                 s->last_mv[i][j][0] = val;
 956                                 s->mv[i][j][0]      = val;
 957                                 av_dlog(s->avctx, "fmx=%d\n", val);
 958                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
 959                                                          s->last_mv[i][j][1] >> 1);
 960                                 s->last_mv[i][j][1] = val << 1;
 961                                 s->mv[i][j][1]      = val;
 962                                 av_dlog(s->avctx, "fmy=%d\n", val);
 963                             }
 964                         }
 965                     }
 966                 } else {
 967                     av_assert0(!s->progressive_sequence);
 968                     mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
 969                     for (i = 0; i < 2; i++) {
 970                         if (USES_LIST(mb_type, i)) {
 971                             s->field_select[i][0] = get_bits1(&s->gb);
 972                             for (k = 0; k < 2; k++) {
 973                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
 974                                                          s->last_mv[i][0][k]);
 975                                 s->last_mv[i][0][k] = val;
 976                                 s->last_mv[i][1][k] = val;
 977                                 s->mv[i][0][k]      = val;
 978                             }
 979                         }
 980                     }
 981                 }
 982                 break;
 983             case MT_DMV:
 984                 if (s->progressive_sequence){
 985                     av_log(s->avctx, AV_LOG_ERROR, "MT_DMV in progressive_sequence\n");
 986                     return AVERROR_INVALIDDATA;
 987                 }
 988                 s->mv_type = MV_TYPE_DMV;
 989                 for (i = 0; i < 2; i++) {
 990                     if (USES_LIST(mb_type, i)) {
 991                         int dmx, dmy, mx, my, m;
 992                         const int my_shift = s->picture_structure == PICT_FRAME;
 993
 994                         mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
 995                                                 s->last_mv[i][0][0]);
 996                         s->last_mv[i][0][0] = mx;
 997                         s->last_mv[i][1][0] = mx;
 998                         dmx = get_dmv(s);
 999                         my  = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
1000                                                  s->last_mv[i][0][1] >> my_shift);
1001                         dmy = get_dmv(s);
1002
1003
1004                         s->last_mv[i][0][1] = my << my_shift;
1005                         s->last_mv[i][1][1] = my << my_shift;
1006
1007                         s->mv[i][0][0] = mx;
1008                         s->mv[i][0][1] = my;
1009                         s->mv[i][1][0] = mx; // not used
1010                         s->mv[i][1][1] = my; // not used
1011
1012                         if (s->picture_structure == PICT_FRAME) {
1013                             mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
1014
1015                             // m = 1 + 2 * s->top_field_first;
1016                             m = s->top_field_first ? 1 : 3;
1017
1018                             /* top -> top pred */
1019                             s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1020                             s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
1021                             m = 4 - m;
1022                             s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
1023                             s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
1024                         } else {
1025                             mb_type |= MB_TYPE_16x16;
1026
1027                             s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
1028                             s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
1029                             if (s->picture_structure == PICT_TOP_FIELD)
1030                                 s->mv[i][2][1]--;
1031                             else
1032                                 s->mv[i][2][1]++;
1033                         }
1034                     }
1035                 }
1036                 break;
1037             default:
1038                 av_log(s->avctx, AV_LOG_ERROR,
1039                        "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
1040                 return AVERROR_INVALIDDATA;
1041             }
1042         }
1043
1044         s->mb_intra = 0;
1045         if (HAS_CBP(mb_type)) {
1046             s->bdsp.clear_blocks(s->block[0]);
1047
1048             cbp = get_vlc2(&s->gb, ff_mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
1049             if (mb_block_count > 6) {
1050                 cbp <<= mb_block_count - 6;
1051                 cbp  |= get_bits(&s->gb, mb_block_count - 6);
1052                 s->bdsp.clear_blocks(s->block[6]);
1053             }
1054             if (cbp <= 0) {
1055                 av_log(s->avctx, AV_LOG_ERROR,
1056                        "invalid cbp %d at %d %d\n", cbp, s->mb_x, s->mb_y);
1057                 return AVERROR_INVALIDDATA;
1058             }
1059
1060             // if 1, we memcpy blocks in xvmcvideo
1061             if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1062                 ff_xvmc_pack_pblocks(s, cbp);
1063
1064             if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
1065                 if (s->flags2 & CODEC_FLAG2_FAST) {
1066                     for (i = 0; i < 6; i++) {
1067                         if (cbp & 32)
1068                             mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
1069                         else
1070                             s->block_last_index[i] = -1;
1071                         cbp += cbp;
1072                     }
1073                 } else {
1074                     cbp <<= 12 - mb_block_count;
1075
1076                     for (i = 0; i < mb_block_count; i++) {
1077                         if (cbp & (1 << 11)) {
1078                             if ((ret = mpeg2_decode_block_non_intra(s, *s->pblocks[i], i)) < 0)
1079                                 return ret;
1080                         } else {
1081                             s->block_last_index[i] = -1;
1082                         }
1083                         cbp += cbp;
1084                     }
1085                 }
1086             } else {
1087                 if (s->flags2 & CODEC_FLAG2_FAST) {
1088                     for (i = 0; i < 6; i++) {
1089                         if (cbp & 32)
1090                             mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1091                         else
1092                             s->block_last_index[i] = -1;
1093                         cbp += cbp;
1094                     }
1095                 } else {
1096                     for (i = 0; i < 6; i++) {
1097                         if (cbp & 32) {
1098                             if ((ret = mpeg1_decode_block_inter(s, *s->pblocks[i], i)) < 0)
1099                                 return ret;
1100                         } else {
1101                             s->block_last_index[i] = -1;
1102                         }
1103                         cbp += cbp;
1104                     }
1105                 }
1106             }
1107         } else {
1108             for (i = 0; i < 12; i++)
1109                 s->block_last_index[i] = -1;
1110         }
1111     }
1112
1113     s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1114
1115     return 0;
1116 }
1117
1118 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1119 {
1120     Mpeg1Context *s    = avctx->priv_data;
1121     MpegEncContext *s2 = &s->mpeg_enc_ctx;
1122
1123     ff_mpv_decode_defaults(s2);
1124
1125     if (   avctx->codec_tag != AV_RL32("VCR2")
1126         && avctx->codec_tag != AV_RL32("BW10"))
1127         avctx->coded_width = avctx->coded_height = 0; // do not trust dimensions from input
1128     ff_mpv_decode_init(s2, avctx);
1129
1130     s->mpeg_enc_ctx.avctx  = avctx;
1131
1132     /* we need some permutation to store matrices,
1133      * until the decoder sets the real permutation. */
1134     ff_mpv_idct_init(s2);
1135     ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1136     ff_mpeg12_init_vlcs();
1137
1138     s->mpeg_enc_ctx_allocated      = 0;
1139     s->mpeg_enc_ctx.picture_number = 0;
1140     s->repeat_field                = 0;
1141     s->mpeg_enc_ctx.codec_id       = avctx->codec->id;
1142     avctx->color_range             = AVCOL_RANGE_MPEG;
1143     if (avctx->codec->id == AV_CODEC_ID_MPEG1VIDEO)
1144         avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1145     else
1146         avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
1147     return 0;
1148 }
1149
1150 static int mpeg_decode_update_thread_context(AVCodecContext *avctx,
1151                                              const AVCodecContext *avctx_from)
1152 {
1153     Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1154     MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1155     int err;
1156
1157     if (avctx == avctx_from               ||
1158         !ctx_from->mpeg_enc_ctx_allocated ||
1159         !s1->context_initialized)
1160         return 0;
1161
1162     err = ff_mpeg_update_thread_context(avctx, avctx_from);
1163     if (err)
1164         return err;
1165
1166     if (!ctx->mpeg_enc_ctx_allocated)
1167         memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1168
1169     if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1170         s->picture_number++;
1171
1172     return 0;
1173 }
1174
1175 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1176                                  const uint8_t *new_perm)
1177 {
1178     uint16_t temp_matrix[64];
1179     int i;
1180
1181     memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1182
1183     for (i = 0; i < 64; i++)
1184         matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1185 }
1186
1187 static const enum AVPixelFormat mpeg1_hwaccel_pixfmt_list_420[] = {
1188 #if CONFIG_MPEG1_XVMC_HWACCEL
1189     AV_PIX_FMT_XVMC,
1190 #endif
1191 #if CONFIG_MPEG1_VDPAU_HWACCEL
1192     AV_PIX_FMT_VDPAU_MPEG1,
1193     AV_PIX_FMT_VDPAU,
1194 #endif
1195     AV_PIX_FMT_YUV420P,
1196     AV_PIX_FMT_NONE
1197 };
1198
1199 static const enum AVPixelFormat mpeg2_hwaccel_pixfmt_list_420[] = {
1200 #if CONFIG_MPEG2_XVMC_HWACCEL
1201     AV_PIX_FMT_XVMC,
1202 #endif
1203 #if CONFIG_MPEG2_VDPAU_HWACCEL
1204     AV_PIX_FMT_VDPAU_MPEG2,
1205     AV_PIX_FMT_VDPAU,
1206 #endif
1207 #if CONFIG_MPEG2_DXVA2_HWACCEL
1208     AV_PIX_FMT_DXVA2_VLD,
1209 #endif
1210 #if CONFIG_MPEG2_VAAPI_HWACCEL
1211     AV_PIX_FMT_VAAPI_VLD,
1212 #endif
1213     AV_PIX_FMT_YUV420P,
1214     AV_PIX_FMT_NONE
1215 };
1216
1217 static const enum AVPixelFormat mpeg12_pixfmt_list_422[] = {
1218     AV_PIX_FMT_YUV422P,
1219     AV_PIX_FMT_NONE
1220 };
1221
1222 static const enum AVPixelFormat mpeg12_pixfmt_list_444[] = {
1223     AV_PIX_FMT_YUV444P,
1224     AV_PIX_FMT_NONE
1225 };
1226
1227 static inline int uses_vdpau(AVCodecContext *avctx) {
1228     return avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG1 || avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG2;
1229 }
1230
1231 static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
1232 {
1233     Mpeg1Context *s1  = avctx->priv_data;
1234     MpegEncContext *s = &s1->mpeg_enc_ctx;
1235     const enum AVPixelFormat *pix_fmts;
1236
1237     if (s->chroma_format < 2)
1238         pix_fmts = avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO ?
1239                                 mpeg1_hwaccel_pixfmt_list_420 :
1240                                 mpeg2_hwaccel_pixfmt_list_420;
1241     else if (s->chroma_format == 2)
1242         pix_fmts = mpeg12_pixfmt_list_422;
1243     else
1244         pix_fmts = mpeg12_pixfmt_list_444;
1245
1246     return ff_thread_get_format(avctx, pix_fmts);
1247 }
1248
1249 static void setup_hwaccel_for_pixfmt(AVCodecContext *avctx)
1250 {
1251     // until then pix_fmt may be changed right after codec init
1252     if (avctx->hwaccel || uses_vdpau(avctx))
1253         if (avctx->idct_algo == FF_IDCT_AUTO)
1254             avctx->idct_algo = FF_IDCT_SIMPLE;
1255
1256     if (avctx->hwaccel && avctx->pix_fmt == AV_PIX_FMT_XVMC) {
1257         Mpeg1Context *s1 = avctx->priv_data;
1258         MpegEncContext *s = &s1->mpeg_enc_ctx;
1259
1260         s->pack_pblocks = 1;
1261 #if FF_API_XVMC
1262         avctx->xvmc_acceleration = 2;
1263 #endif /* FF_API_XVMC */
1264     }
1265 }
1266
1267 /* Call this function when we know all parameters.
1268  * It may be called in different places for MPEG-1 and MPEG-2. */
1269 static int mpeg_decode_postinit(AVCodecContext *avctx)
1270 {
1271     Mpeg1Context *s1  = avctx->priv_data;
1272     MpegEncContext *s = &s1->mpeg_enc_ctx;
1273     uint8_t old_permutation[64];
1274     int ret;
1275
1276     if ((s1->mpeg_enc_ctx_allocated == 0)                   ||
1277         avctx->coded_width       != s->width                ||
1278         avctx->coded_height      != s->height               ||
1279         s1->save_width           != s->width                ||
1280         s1->save_height          != s->height               ||
1281         s1->save_aspect_info     != s->aspect_ratio_info    ||
1282         (s1->save_progressive_seq != s->progressive_sequence && FFALIGN(s->height, 16) != FFALIGN(s->height, 32)) ||
1283         0) {
1284         if (s1->mpeg_enc_ctx_allocated) {
1285             ParseContext pc = s->parse_context;
1286             s->parse_context.buffer = 0;
1287             ff_mpv_common_end(s);
1288             s->parse_context = pc;
1289             s1->mpeg_enc_ctx_allocated = 0;
1290         }
1291
1292         if ((s->width == 0) || (s->height == 0))
1293             return -2;
1294
1295         ret = ff_set_dimensions(avctx, s->width, s->height);
1296         if (ret < 0)
1297             return ret;
1298
1299         if (avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->bit_rate) {
1300             avctx->rc_max_rate = s->bit_rate;
1301         } else if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && s->bit_rate &&
1302                    (s->bit_rate != 0x3FFFF*400 || s->vbv_delay != 0xFFFF)) {
1303             avctx->bit_rate = s->bit_rate;
1304         }
1305         s1->save_aspect_info     = s->aspect_ratio_info;
1306         s1->save_width           = s->width;
1307         s1->save_height          = s->height;
1308         s1->save_progressive_seq = s->progressive_sequence;
1309
1310         /* low_delay may be forced, in this case we will have B-frames
1311          * that behave like P-frames. */
1312         avctx->has_b_frames = !s->low_delay;
1313
1314         if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1315             // MPEG-1 fps
1316             avctx->framerate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
1317             // MPEG-1 aspect
1318             avctx->sample_aspect_ratio = av_d2q(1.0 / ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1319             avctx->ticks_per_frame     = 1;
1320         } else { // MPEG-2
1321             // MPEG-2 fps
1322             av_reduce(&s->avctx->framerate.num,
1323                       &s->avctx->framerate.den,
1324                       ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
1325                       ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1326                       1 << 30);
1327             avctx->ticks_per_frame = 2;
1328             // MPEG-2 aspect
1329             if (s->aspect_ratio_info > 1) {
1330                 AVRational dar =
1331                     av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1332                                       (AVRational) { s1->pan_scan.width,
1333                                                      s1->pan_scan.height }),
1334                              (AVRational) { s->width, s->height });
1335
1336                 /* We ignore the spec here and guess a bit as reality does not
1337                  * match the spec, see for example res_change_ffmpeg_aspect.ts
1338                  * and sequence-display-aspect.mpg.
1339                  * issue1613, 621, 562 */
1340                 if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1341                     (av_cmp_q(dar, (AVRational) { 4, 3 }) &&
1342                      av_cmp_q(dar, (AVRational) { 16, 9 }))) {
1343                     s->avctx->sample_aspect_ratio =
1344                         av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1345                                  (AVRational) { s->width, s->height });
1346                 } else {
1347                     s->avctx->sample_aspect_ratio =
1348                         av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1349                                  (AVRational) { s1->pan_scan.width, s1->pan_scan.height });
1350 // issue1613 4/3 16/9 -> 16/9
1351 // res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1352 // widescreen-issue562.mpg 4/3 16/9 -> 16/9
1353 //                    s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1354                     av_dlog(avctx, "A %d/%d\n",
1355                             ff_mpeg2_aspect[s->aspect_ratio_info].num,
1356                             ff_mpeg2_aspect[s->aspect_ratio_info].den);
1357                     av_dlog(avctx, "B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1358                             s->avctx->sample_aspect_ratio.den);
1359                 }
1360             } else {
1361                 s->avctx->sample_aspect_ratio =
1362                     ff_mpeg2_aspect[s->aspect_ratio_info];
1363             }
1364         } // MPEG-2
1365
1366         ff_set_sar(s->avctx, s->avctx->sample_aspect_ratio);
1367
1368         avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1369         setup_hwaccel_for_pixfmt(avctx);
1370
1371         /* Quantization matrices may need reordering
1372          * if DCT permutation is changed. */
1373         memcpy(old_permutation, s->idsp.idct_permutation, 64 * sizeof(uint8_t));
1374
1375         ff_mpv_idct_init(s);
1376         if (ff_mpv_common_init(s) < 0)
1377             return -2;
1378
1379         quant_matrix_rebuild(s->intra_matrix,        old_permutation, s->idsp.idct_permutation);
1380         quant_matrix_rebuild(s->inter_matrix,        old_permutation, s->idsp.idct_permutation);
1381         quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->idsp.idct_permutation);
1382         quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->idsp.idct_permutation);
1383
1384         s1->mpeg_enc_ctx_allocated = 1;
1385     }
1386     return 0;
1387 }
1388
1389 static int mpeg1_decode_picture(AVCodecContext *avctx, const uint8_t *buf,
1390                                 int buf_size)
1391 {
1392     Mpeg1Context *s1  = avctx->priv_data;
1393     MpegEncContext *s = &s1->mpeg_enc_ctx;
1394     int ref, f_code, vbv_delay;
1395
1396     init_get_bits(&s->gb, buf, buf_size * 8);
1397
1398     ref = get_bits(&s->gb, 10); /* temporal ref */
1399     s->pict_type = get_bits(&s->gb, 3);
1400     if (s->pict_type == 0 || s->pict_type > 3)
1401         return AVERROR_INVALIDDATA;
1402
1403     vbv_delay = get_bits(&s->gb, 16);
1404     s->vbv_delay = vbv_delay;
1405     if (s->pict_type == AV_PICTURE_TYPE_P ||
1406         s->pict_type == AV_PICTURE_TYPE_B) {
1407         s->full_pel[0] = get_bits1(&s->gb);
1408         f_code = get_bits(&s->gb, 3);
1409         if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1410             return AVERROR_INVALIDDATA;
1411         f_code += !f_code;
1412         s->mpeg_f_code[0][0] = f_code;
1413         s->mpeg_f_code[0][1] = f_code;
1414     }
1415     if (s->pict_type == AV_PICTURE_TYPE_B) {
1416         s->full_pel[1] = get_bits1(&s->gb);
1417         f_code = get_bits(&s->gb, 3);
1418         if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1419             return AVERROR_INVALIDDATA;
1420         f_code += !f_code;
1421         s->mpeg_f_code[1][0] = f_code;
1422         s->mpeg_f_code[1][1] = f_code;
1423     }
1424     s->current_picture.f->pict_type = s->pict_type;
1425     s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1426
1427     if (avctx->debug & FF_DEBUG_PICT_INFO)
1428         av_log(avctx, AV_LOG_DEBUG,
1429                "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1430
1431     s->y_dc_scale = 8;
1432     s->c_dc_scale = 8;
1433     return 0;
1434 }
1435
1436 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1437 {
1438     MpegEncContext *s = &s1->mpeg_enc_ctx;
1439     int horiz_size_ext, vert_size_ext;
1440     int bit_rate_ext;
1441
1442     skip_bits(&s->gb, 1); /* profile and level esc*/
1443     s->avctx->profile       = get_bits(&s->gb, 3);
1444     s->avctx->level         = get_bits(&s->gb, 4);
1445     s->progressive_sequence = get_bits1(&s->gb);   /* progressive_sequence */
1446     s->chroma_format        = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1447     horiz_size_ext          = get_bits(&s->gb, 2);
1448     vert_size_ext           = get_bits(&s->gb, 2);
1449     s->width  |= (horiz_size_ext << 12);
1450     s->height |= (vert_size_ext  << 12);
1451     bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1452     s->bit_rate += (bit_rate_ext << 18) * 400;
1453     skip_bits1(&s->gb); /* marker */
1454     s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1455
1456     s->low_delay = get_bits1(&s->gb);
1457     if (s->flags & CODEC_FLAG_LOW_DELAY)
1458         s->low_delay = 1;
1459
1460     s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1461     s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1462
1463     av_dlog(s->avctx, "sequence extension\n");
1464     s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1465
1466     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1467         av_log(s->avctx, AV_LOG_DEBUG,
1468                "profile: %d, level: %d ps: %d cf:%d vbv buffer: %d, bitrate:%d\n",
1469                s->avctx->profile, s->avctx->level, s->progressive_sequence, s->chroma_format,
1470                s->avctx->rc_buffer_size, s->bit_rate);
1471 }
1472
1473 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1474 {
1475     MpegEncContext *s = &s1->mpeg_enc_ctx;
1476     int color_description, w, h;
1477
1478     skip_bits(&s->gb, 3); /* video format */
1479     color_description = get_bits1(&s->gb);
1480     if (color_description) {
1481         s->avctx->color_primaries = get_bits(&s->gb, 8);
1482         s->avctx->color_trc       = get_bits(&s->gb, 8);
1483         s->avctx->colorspace      = get_bits(&s->gb, 8);
1484     }
1485     w = get_bits(&s->gb, 14);
1486     skip_bits(&s->gb, 1); // marker
1487     h = get_bits(&s->gb, 14);
1488     // remaining 3 bits are zero padding
1489
1490     s1->pan_scan.width  = 16 * w;
1491     s1->pan_scan.height = 16 * h;
1492
1493     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1494         av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1495 }
1496
1497 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1498 {
1499     MpegEncContext *s = &s1->mpeg_enc_ctx;
1500     int i, nofco;
1501
1502     nofco = 1;
1503     if (s->progressive_sequence) {
1504         if (s->repeat_first_field) {
1505             nofco++;
1506             if (s->top_field_first)
1507                 nofco++;
1508         }
1509     } else {
1510         if (s->picture_structure == PICT_FRAME) {
1511             nofco++;
1512             if (s->repeat_first_field)
1513                 nofco++;
1514         }
1515     }
1516     for (i = 0; i < nofco; i++) {
1517         s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1518         skip_bits(&s->gb, 1); // marker
1519         s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1520         skip_bits(&s->gb, 1); // marker
1521     }
1522
1523     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1524         av_log(s->avctx, AV_LOG_DEBUG,
1525                "pde (%"PRId16",%"PRId16") (%"PRId16",%"PRId16") (%"PRId16",%"PRId16")\n",
1526                s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1527                s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1528                s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1529 }
1530
1531 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64],
1532                        uint16_t matrix1[64], int intra)
1533 {
1534     int i;
1535
1536     for (i = 0; i < 64; i++) {
1537         int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1538         int v = get_bits(&s->gb, 8);
1539         if (v == 0) {
1540             av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1541             return AVERROR_INVALIDDATA;
1542         }
1543         if (intra && i == 0 && v != 8) {
1544             av_log(s->avctx, AV_LOG_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v);
1545             v = 8; // needed by pink.mpg / issue1046
1546         }
1547         matrix0[j] = v;
1548         if (matrix1)
1549             matrix1[j] = v;
1550     }
1551     return 0;
1552 }
1553
1554 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1555 {
1556     av_dlog(s->avctx, "matrix extension\n");
1557
1558     if (get_bits1(&s->gb))
1559         load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1560     if (get_bits1(&s->gb))
1561         load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1562     if (get_bits1(&s->gb))
1563         load_matrix(s, s->chroma_intra_matrix, NULL, 1);
1564     if (get_bits1(&s->gb))
1565         load_matrix(s, s->chroma_inter_matrix, NULL, 0);
1566 }
1567
1568 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1569 {
1570     MpegEncContext *s = &s1->mpeg_enc_ctx;
1571
1572     s->full_pel[0]       = s->full_pel[1] = 0;
1573     s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1574     s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1575     s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1576     s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1577     if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1578         av_log(s->avctx, AV_LOG_ERROR,
1579                "Missing picture start code, guessing missing values\n");
1580         if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1581             if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1582                 s->pict_type = AV_PICTURE_TYPE_I;
1583             else
1584                 s->pict_type = AV_PICTURE_TYPE_P;
1585         } else
1586             s->pict_type = AV_PICTURE_TYPE_B;
1587         s->current_picture.f->pict_type = s->pict_type;
1588         s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1589     }
1590     s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0];
1591     s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1];
1592     s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0];
1593     s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1];
1594
1595     s->intra_dc_precision         = get_bits(&s->gb, 2);
1596     s->picture_structure          = get_bits(&s->gb, 2);
1597     s->top_field_first            = get_bits1(&s->gb);
1598     s->frame_pred_frame_dct       = get_bits1(&s->gb);
1599     s->concealment_motion_vectors = get_bits1(&s->gb);
1600     s->q_scale_type               = get_bits1(&s->gb);
1601     s->intra_vlc_format           = get_bits1(&s->gb);
1602     s->alternate_scan             = get_bits1(&s->gb);
1603     s->repeat_first_field         = get_bits1(&s->gb);
1604     s->chroma_420_type            = get_bits1(&s->gb);
1605     s->progressive_frame          = get_bits1(&s->gb);
1606
1607     if (s->alternate_scan) {
1608         ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1609         ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1610     } else {
1611         ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1612         ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1613     }
1614
1615     /* composite display not parsed */
1616     av_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1617     av_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1618     av_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1619     av_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1620     av_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1621     av_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1622     av_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1623     av_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1624     av_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1625 }
1626
1627 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1628 {
1629     AVCodecContext *avctx = s->avctx;
1630     Mpeg1Context *s1      = (Mpeg1Context *) s;
1631     int ret;
1632
1633     /* start frame decoding */
1634     if (s->first_field || s->picture_structure == PICT_FRAME) {
1635         AVFrameSideData *pan_scan;
1636
1637         if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
1638             return ret;
1639
1640         ff_mpeg_er_frame_start(s);
1641
1642         /* first check if we must repeat the frame */
1643         s->current_picture_ptr->f->repeat_pict = 0;
1644         if (s->repeat_first_field) {
1645             if (s->progressive_sequence) {
1646                 if (s->top_field_first)
1647                     s->current_picture_ptr->f->repeat_pict = 4;
1648                 else
1649                     s->current_picture_ptr->f->repeat_pict = 2;
1650             } else if (s->progressive_frame) {
1651                 s->current_picture_ptr->f->repeat_pict = 1;
1652             }
1653         }
1654
1655         pan_scan = av_frame_new_side_data(s->current_picture_ptr->f,
1656                                           AV_FRAME_DATA_PANSCAN,
1657                                           sizeof(s1->pan_scan));
1658         if (!pan_scan)
1659             return AVERROR(ENOMEM);
1660         memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
1661
1662         if (s1->a53_caption) {
1663             AVFrameSideData *sd = av_frame_new_side_data(
1664                 s->current_picture_ptr->f, AV_FRAME_DATA_A53_CC,
1665                 s1->a53_caption_size);
1666             if (sd)
1667                 memcpy(sd->data, s1->a53_caption, s1->a53_caption_size);
1668             av_freep(&s1->a53_caption);
1669         }
1670
1671         if (s1->has_stereo3d) {
1672             AVStereo3D *stereo = av_stereo3d_create_side_data(s->current_picture_ptr->f);
1673             if (!stereo)
1674                 return AVERROR(ENOMEM);
1675
1676             *stereo = s1->stereo3d;
1677             s1->has_stereo3d = 0;
1678         }
1679
1680         if (s1->has_afd) {
1681             AVFrameSideData *sd =
1682                 av_frame_new_side_data(s->current_picture_ptr->f,
1683                                        AV_FRAME_DATA_AFD, 1);
1684             if (!sd)
1685                 return AVERROR(ENOMEM);
1686
1687             *sd->data   = s1->afd;
1688             s1->has_afd = 0;
1689         }
1690
1691         if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1692             ff_thread_finish_setup(avctx);
1693     } else { // second field
1694         int i;
1695
1696         if (!s->current_picture_ptr) {
1697             av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1698             return -1;
1699         }
1700
1701         if (s->avctx->hwaccel &&
1702             (s->avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
1703             if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1704                 av_log(avctx, AV_LOG_ERROR,
1705                        "hardware accelerator failed to decode first field\n");
1706         }
1707
1708         for (i = 0; i < 4; i++) {
1709             s->current_picture.f->data[i] = s->current_picture_ptr->f->data[i];
1710             if (s->picture_structure == PICT_BOTTOM_FIELD)
1711                 s->current_picture.f->data[i] +=
1712                     s->current_picture_ptr->f->linesize[i];
1713         }
1714     }
1715
1716     if (avctx->hwaccel) {
1717         if ((ret = avctx->hwaccel->start_frame(avctx, buf, buf_size)) < 0)
1718             return ret;
1719     }
1720
1721     return 0;
1722 }
1723
1724 #define DECODE_SLICE_ERROR -1
1725 #define DECODE_SLICE_OK     0
1726
1727 /**
1728  * Decode a slice.
1729  * MpegEncContext.mb_y must be set to the MB row from the startcode.
1730  * @return DECODE_SLICE_ERROR if the slice is damaged,
1731  *         DECODE_SLICE_OK if this slice is OK
1732  */
1733 static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1734                              const uint8_t **buf, int buf_size)
1735 {
1736     AVCodecContext *avctx = s->avctx;
1737     const int lowres      = s->avctx->lowres;
1738     const int field_pic   = s->picture_structure != PICT_FRAME;
1739     int ret;
1740
1741     s->resync_mb_x =
1742     s->resync_mb_y = -1;
1743
1744     av_assert0(mb_y < s->mb_height);
1745
1746     init_get_bits(&s->gb, *buf, buf_size * 8);
1747     if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1748         skip_bits(&s->gb, 3);
1749
1750     ff_mpeg1_clean_buffers(s);
1751     s->interlaced_dct = 0;
1752
1753     s->qscale = get_qscale(s);
1754
1755     if (s->qscale == 0) {
1756         av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1757         return AVERROR_INVALIDDATA;
1758     }
1759
1760     /* extra slice info */
1761     if (skip_1stop_8data_bits(&s->gb) < 0)
1762         return AVERROR_INVALIDDATA;
1763
1764     s->mb_x = 0;
1765
1766     if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1767         skip_bits1(&s->gb);
1768     } else {
1769         while (get_bits_left(&s->gb) > 0) {
1770             int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1771                                 MBINCR_VLC_BITS, 2);
1772             if (code < 0) {
1773                 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1774                 return AVERROR_INVALIDDATA;
1775             }
1776             if (code >= 33) {
1777                 if (code == 33)
1778                     s->mb_x += 33;
1779                 /* otherwise, stuffing, nothing to do */
1780             } else {
1781                 s->mb_x += code;
1782                 break;
1783             }
1784         }
1785     }
1786
1787     if (s->mb_x >= (unsigned) s->mb_width) {
1788         av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1789         return AVERROR_INVALIDDATA;
1790     }
1791
1792     if (avctx->hwaccel && avctx->hwaccel->decode_slice) {
1793         const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1794         int start_code = -1;
1795         buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1796         if (buf_end < *buf + buf_size)
1797             buf_end -= 4;
1798         s->mb_y = mb_y;
1799         if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1800             return DECODE_SLICE_ERROR;
1801         *buf = buf_end;
1802         return DECODE_SLICE_OK;
1803     }
1804
1805     s->resync_mb_x = s->mb_x;
1806     s->resync_mb_y = s->mb_y = mb_y;
1807     s->mb_skip_run = 0;
1808     ff_init_block_index(s);
1809
1810     if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1811         if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1812             av_log(s->avctx, AV_LOG_DEBUG,
1813                    "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",
1814                    s->qscale,
1815                    s->mpeg_f_code[0][0], s->mpeg_f_code[0][1],
1816                    s->mpeg_f_code[1][0], s->mpeg_f_code[1][1],
1817                    s->pict_type  == AV_PICTURE_TYPE_I ? "I" :
1818                    (s->pict_type == AV_PICTURE_TYPE_P ? "P" :
1819                    (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
1820                    s->progressive_sequence ? "ps"  : "",
1821                    s->progressive_frame    ? "pf"  : "",
1822                    s->alternate_scan       ? "alt" : "",
1823                    s->top_field_first      ? "top" : "",
1824                    s->intra_dc_precision, s->picture_structure,
1825                    s->frame_pred_frame_dct, s->concealment_motion_vectors,
1826                    s->q_scale_type, s->intra_vlc_format,
1827                    s->repeat_first_field, s->chroma_420_type ? "420" : "");
1828         }
1829     }
1830
1831     for (;;) {
1832         // If 1, we memcpy blocks in xvmcvideo.
1833         if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1834             ff_xvmc_init_block(s); // set s->block
1835
1836         if ((ret = mpeg_decode_mb(s, s->block)) < 0)
1837             return ret;
1838
1839         // Note motion_val is normally NULL unless we want to extract the MVs.
1840         if (s->current_picture.motion_val[0] && !s->encoding) {
1841             const int wrap = s->b8_stride;
1842             int xy         = s->mb_x * 2 + s->mb_y * 2 * wrap;
1843             int b8_xy      = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1844             int motion_x, motion_y, dir, i;
1845
1846             for (i = 0; i < 2; i++) {
1847                 for (dir = 0; dir < 2; dir++) {
1848                     if (s->mb_intra ||
1849                         (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1850                         motion_x = motion_y = 0;
1851                     } else if (s->mv_type == MV_TYPE_16X16 ||
1852                                (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1853                         motion_x = s->mv[dir][0][0];
1854                         motion_y = s->mv[dir][0][1];
1855                     } else { /* if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8)) */
1856                         motion_x = s->mv[dir][i][0];
1857                         motion_y = s->mv[dir][i][1];
1858                     }
1859
1860                     s->current_picture.motion_val[dir][xy][0]     = motion_x;
1861                     s->current_picture.motion_val[dir][xy][1]     = motion_y;
1862                     s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1863                     s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1864                     s->current_picture.ref_index [dir][b8_xy]     =
1865                     s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1866                     av_assert2(s->field_select[dir][i] == 0 ||
1867                                s->field_select[dir][i] == 1);
1868                 }
1869                 xy    += wrap;
1870                 b8_xy += 2;
1871             }
1872         }
1873
1874         s->dest[0] += 16 >> lowres;
1875         s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1876         s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1877
1878         ff_mpv_decode_mb(s, s->block);
1879
1880         if (++s->mb_x >= s->mb_width) {
1881             const int mb_size = 16 >> s->avctx->lowres;
1882
1883             ff_mpeg_draw_horiz_band(s, mb_size * (s->mb_y >> field_pic), mb_size);
1884             ff_mpv_report_decode_progress(s);
1885
1886             s->mb_x  = 0;
1887             s->mb_y += 1 << field_pic;
1888
1889             if (s->mb_y >= s->mb_height) {
1890                 int left   = get_bits_left(&s->gb);
1891                 int is_d10 = s->chroma_format == 2 &&
1892                              s->pict_type == AV_PICTURE_TYPE_I &&
1893                              avctx->profile == 0 && avctx->level == 5 &&
1894                              s->intra_dc_precision == 2 &&
1895                              s->q_scale_type == 1 && s->alternate_scan == 0 &&
1896                              s->progressive_frame == 0
1897                              /* vbv_delay == 0xBBB || 0xE10 */;
1898
1899                 if (left >= 32 && !is_d10) {
1900                     GetBitContext gb = s->gb;
1901                     align_get_bits(&gb);
1902                     if (show_bits(&gb, 24) == 0x060E2B) {
1903                         av_log(avctx, AV_LOG_DEBUG, "Invalid MXF data found in video stream\n");
1904                         is_d10 = 1;
1905                     }
1906                 }
1907
1908                 if (left < 0 ||
1909                     (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10) ||
1910                     ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
1911                     av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n",
1912                            left, show_bits(&s->gb, FFMIN(left, 23)));
1913                     return -1;
1914                 } else
1915                     goto eos;
1916             }
1917             // There are some files out there which are missing the last slice
1918             // in cases where the slice is completely outside the visible
1919             // area, we detect this here instead of running into the end expecting
1920             // more data
1921             if (s->mb_y >= ((s->height + 15) >> 4) &&
1922                 s->progressive_frame &&
1923                 !s->progressive_sequence &&
1924                 get_bits_left(&s->gb) <= 8 &&
1925                 get_bits_left(&s->gb) >= 0 &&
1926                 s->mb_skip_run == -1 &&
1927                 show_bits(&s->gb, 8) == 0)
1928                 goto eos;
1929
1930             ff_init_block_index(s);
1931         }
1932
1933         /* skip mb handling */
1934         if (s->mb_skip_run == -1) {
1935             /* read increment again */
1936             s->mb_skip_run = 0;
1937             for (;;) {
1938                 int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1939                                     MBINCR_VLC_BITS, 2);
1940                 if (code < 0) {
1941                     av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1942                     return AVERROR_INVALIDDATA;
1943                 }
1944                 if (code >= 33) {
1945                     if (code == 33) {
1946                         s->mb_skip_run += 33;
1947                     } else if (code == 35) {
1948                         if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1949                             av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1950                             return -1;
1951                         }
1952                         goto eos; /* end of slice */
1953                     }
1954                     /* otherwise, stuffing, nothing to do */
1955                 } else {
1956                     s->mb_skip_run += code;
1957                     break;
1958                 }
1959             }
1960             if (s->mb_skip_run) {
1961                 int i;
1962                 if (s->pict_type == AV_PICTURE_TYPE_I) {
1963                     av_log(s->avctx, AV_LOG_ERROR,
1964                            "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1965                     return AVERROR_INVALIDDATA;
1966                 }
1967
1968                 /* skip mb */
1969                 s->mb_intra = 0;
1970                 for (i = 0; i < 12; i++)
1971                     s->block_last_index[i] = -1;
1972                 if (s->picture_structure == PICT_FRAME)
1973                     s->mv_type = MV_TYPE_16X16;
1974                 else
1975                     s->mv_type = MV_TYPE_FIELD;
1976                 if (s->pict_type == AV_PICTURE_TYPE_P) {
1977                     /* if P type, zero motion vector is implied */
1978                     s->mv_dir             = MV_DIR_FORWARD;
1979                     s->mv[0][0][0]        = s->mv[0][0][1]      = 0;
1980                     s->last_mv[0][0][0]   = s->last_mv[0][0][1] = 0;
1981                     s->last_mv[0][1][0]   = s->last_mv[0][1][1] = 0;
1982                     s->field_select[0][0] = (s->picture_structure - 1) & 1;
1983                 } else {
1984                     /* if B type, reuse previous vectors and directions */
1985                     s->mv[0][0][0] = s->last_mv[0][0][0];
1986                     s->mv[0][0][1] = s->last_mv[0][0][1];
1987                     s->mv[1][0][0] = s->last_mv[1][0][0];
1988                     s->mv[1][0][1] = s->last_mv[1][0][1];
1989                 }
1990             }
1991         }
1992     }
1993 eos: // end of slice
1994     if (get_bits_left(&s->gb) < 0) {
1995         av_log(s, AV_LOG_ERROR, "overread %d\n", -get_bits_left(&s->gb));
1996         return AVERROR_INVALIDDATA;
1997     }
1998     *buf += (get_bits_count(&s->gb) - 1) / 8;
1999     av_dlog(s, "y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
2000     return 0;
2001 }
2002
2003 static int slice_decode_thread(AVCodecContext *c, void *arg)
2004 {
2005     MpegEncContext *s   = *(void **) arg;
2006     const uint8_t *buf  = s->gb.buffer;
2007     int mb_y            = s->start_mb_y;
2008     const int field_pic = s->picture_structure != PICT_FRAME;
2009
2010     s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
2011
2012     for (;;) {
2013         uint32_t start_code;
2014         int ret;
2015
2016         ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
2017         emms_c();
2018         av_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
2019                 ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
2020                 s->start_mb_y, s->end_mb_y, s->er.error_count);
2021         if (ret < 0) {
2022             if (c->err_recognition & AV_EF_EXPLODE)
2023                 return ret;
2024             if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
2025                 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2026                                 s->mb_x, s->mb_y,
2027                                 ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2028         } else {
2029             ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2030                             s->mb_x - 1, s->mb_y,
2031                             ER_AC_END | ER_DC_END | ER_MV_END);
2032         }
2033
2034         if (s->mb_y == s->end_mb_y)
2035             return 0;
2036
2037         start_code = -1;
2038         buf        = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
2039         mb_y       = start_code - SLICE_MIN_START_CODE;
2040         if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
2041             mb_y += (*buf&0xE0)<<2;
2042         mb_y <<= field_pic;
2043         if (s->picture_structure == PICT_BOTTOM_FIELD)
2044             mb_y++;
2045         if (mb_y < 0 || mb_y >= s->end_mb_y)
2046             return -1;
2047     }
2048 }
2049
2050 /**
2051  * Handle slice ends.
2052  * @return 1 if it seems to be the last slice
2053  */
2054 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2055 {
2056     Mpeg1Context *s1  = avctx->priv_data;
2057     MpegEncContext *s = &s1->mpeg_enc_ctx;
2058
2059     if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2060         return 0;
2061
2062     if (s->avctx->hwaccel) {
2063         if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
2064             av_log(avctx, AV_LOG_ERROR,
2065                    "hardware accelerator failed to decode picture\n");
2066     }
2067
2068     /* end of slice reached */
2069     if (/* s->mb_y << field_pic == s->mb_height && */ !s->first_field && !s1->first_slice) {
2070         /* end of image */
2071
2072         ff_er_frame_end(&s->er);
2073
2074         ff_mpv_frame_end(s);
2075
2076         if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
2077             int ret = av_frame_ref(pict, s->current_picture_ptr->f);
2078             if (ret < 0)
2079                 return ret;
2080             ff_print_debug_info(s, s->current_picture_ptr, pict);
2081             ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2082         } else {
2083             if (avctx->active_thread_type & FF_THREAD_FRAME)
2084                 s->picture_number++;
2085             /* latency of 1 frame for I- and P-frames */
2086             /* XXX: use another variable than picture_number */
2087             if (s->last_picture_ptr) {
2088                 int ret = av_frame_ref(pict, s->last_picture_ptr->f);
2089                 if (ret < 0)
2090                     return ret;
2091                 ff_print_debug_info(s, s->last_picture_ptr, pict);
2092                 ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2093             }
2094         }
2095
2096         return 1;
2097     } else {
2098         return 0;
2099     }
2100 }
2101
2102 static int mpeg1_decode_sequence(AVCodecContext *avctx,
2103                                  const uint8_t *buf, int buf_size)
2104 {
2105     Mpeg1Context *s1  = avctx->priv_data;
2106     MpegEncContext *s = &s1->mpeg_enc_ctx;
2107     int width, height;
2108     int i, v, j;
2109
2110     init_get_bits(&s->gb, buf, buf_size * 8);
2111
2112     width  = get_bits(&s->gb, 12);
2113     height = get_bits(&s->gb, 12);
2114     if (width == 0 || height == 0) {
2115         av_log(avctx, AV_LOG_WARNING,
2116                "Invalid horizontal or vertical size value.\n");
2117         if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2118             return AVERROR_INVALIDDATA;
2119     }
2120     s->aspect_ratio_info = get_bits(&s->gb, 4);
2121     if (s->aspect_ratio_info == 0) {
2122         av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2123         if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2124             return AVERROR_INVALIDDATA;
2125     }
2126     s->frame_rate_index = get_bits(&s->gb, 4);
2127     if (s->frame_rate_index == 0 || s->frame_rate_index > 13) {
2128         av_log(avctx, AV_LOG_WARNING, "frame_rate_index %d is invalid\n", s->frame_rate_index);
2129         s->frame_rate_index = 1;
2130     }
2131     s->bit_rate = get_bits(&s->gb, 18) * 400;
2132     if (get_bits1(&s->gb) == 0) { /* marker */
2133         av_log(avctx, AV_LOG_ERROR, "Marker in sequence header missing\n");
2134         return AVERROR_INVALIDDATA;
2135     }
2136     s->width  = width;
2137     s->height = height;
2138
2139     s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2140     skip_bits(&s->gb, 1);
2141
2142     /* get matrix */
2143     if (get_bits1(&s->gb)) {
2144         load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2145     } else {
2146         for (i = 0; i < 64; i++) {
2147             j = s->idsp.idct_permutation[i];
2148             v = ff_mpeg1_default_intra_matrix[i];
2149             s->intra_matrix[j]        = v;
2150             s->chroma_intra_matrix[j] = v;
2151         }
2152     }
2153     if (get_bits1(&s->gb)) {
2154         load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2155     } else {
2156         for (i = 0; i < 64; i++) {
2157             int j = s->idsp.idct_permutation[i];
2158             v = ff_mpeg1_default_non_intra_matrix[i];
2159             s->inter_matrix[j]        = v;
2160             s->chroma_inter_matrix[j] = v;
2161         }
2162     }
2163
2164     if (show_bits(&s->gb, 23) != 0) {
2165         av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2166         return AVERROR_INVALIDDATA;
2167     }
2168
2169     /* We set MPEG-2 parameters so that it emulates MPEG-1. */
2170     s->progressive_sequence = 1;
2171     s->progressive_frame    = 1;
2172     s->picture_structure    = PICT_FRAME;
2173     s->first_field          = 0;
2174     s->frame_pred_frame_dct = 1;
2175     s->chroma_format        = 1;
2176     s->codec_id             =
2177     s->avctx->codec_id      = AV_CODEC_ID_MPEG1VIDEO;
2178     s->out_format           = FMT_MPEG1;
2179     s->swap_uv              = 0; // AFAIK VCR2 does not have SEQ_HEADER
2180     if (s->flags & CODEC_FLAG_LOW_DELAY)
2181         s->low_delay = 1;
2182
2183     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2184         av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d, aspect_ratio_info: %d \n",
2185                s->avctx->rc_buffer_size, s->bit_rate, s->aspect_ratio_info);
2186
2187     return 0;
2188 }
2189
2190 static int vcr2_init_sequence(AVCodecContext *avctx)
2191 {
2192     Mpeg1Context *s1  = avctx->priv_data;
2193     MpegEncContext *s = &s1->mpeg_enc_ctx;
2194     int i, v;
2195     int ret;
2196
2197     /* start new MPEG-1 context decoding */
2198     s->out_format = FMT_MPEG1;
2199     if (s1->mpeg_enc_ctx_allocated) {
2200         ff_mpv_common_end(s);
2201         s1->mpeg_enc_ctx_allocated = 0;
2202     }
2203     s->width            = avctx->coded_width;
2204     s->height           = avctx->coded_height;
2205     avctx->has_b_frames = 0; // true?
2206     s->low_delay        = 1;
2207
2208     avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2209     setup_hwaccel_for_pixfmt(avctx);
2210
2211     ff_mpv_idct_init(s);
2212     if ((ret = ff_mpv_common_init(s)) < 0)
2213         return ret;
2214     s1->mpeg_enc_ctx_allocated = 1;
2215
2216     for (i = 0; i < 64; i++) {
2217         int j = s->idsp.idct_permutation[i];
2218         v = ff_mpeg1_default_intra_matrix[i];
2219         s->intra_matrix[j]        = v;
2220         s->chroma_intra_matrix[j] = v;
2221
2222         v = ff_mpeg1_default_non_intra_matrix[i];
2223         s->inter_matrix[j]        = v;
2224         s->chroma_inter_matrix[j] = v;
2225     }
2226
2227     s->progressive_sequence  = 1;
2228     s->progressive_frame     = 1;
2229     s->picture_structure     = PICT_FRAME;
2230     s->first_field           = 0;
2231     s->frame_pred_frame_dct  = 1;
2232     s->chroma_format         = 1;
2233     if (s->codec_tag == AV_RL32("BW10")) {
2234         s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2235     } else {
2236         s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
2237         s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
2238     }
2239     s1->save_width           = s->width;
2240     s1->save_height          = s->height;
2241     s1->save_progressive_seq = s->progressive_sequence;
2242     return 0;
2243 }
2244
2245 static int mpeg_decode_a53_cc(AVCodecContext *avctx,
2246                               const uint8_t *p, int buf_size)
2247 {
2248     Mpeg1Context *s1 = avctx->priv_data;
2249
2250     if (buf_size >= 6 &&
2251         p[0] == 'G' && p[1] == 'A' && p[2] == '9' && p[3] == '4' &&
2252         p[4] == 3 && (p[5] & 0x40)) {
2253         /* extract A53 Part 4 CC data */
2254         int cc_count = p[5] & 0x1f;
2255         if (cc_count > 0 && buf_size >= 7 + cc_count * 3) {
2256             av_freep(&s1->a53_caption);
2257             s1->a53_caption_size = cc_count * 3;
2258             s1->a53_caption      = av_malloc(s1->a53_caption_size);
2259             if (s1->a53_caption)
2260                 memcpy(s1->a53_caption, p + 7, s1->a53_caption_size);
2261         }
2262         return 1;
2263     } else if (buf_size >= 11 &&
2264                p[0] == 'C' && p[1] == 'C' && p[2] == 0x01 && p[3] == 0xf8) {
2265         /* extract DVD CC data */
2266         int cc_count = 0;
2267         int i;
2268         // There is a caption count field in the data, but it is often
2269         // incorect.  So count the number of captions present.
2270         for (i = 5; i + 6 <= buf_size && ((p[i] & 0xfe) == 0xfe); i += 6)
2271             cc_count++;
2272         // Transform the DVD format into A53 Part 4 format
2273         if (cc_count > 0) {
2274             av_freep(&s1->a53_caption);
2275             s1->a53_caption_size = cc_count * 6;
2276             s1->a53_caption      = av_malloc(s1->a53_caption_size);
2277             if (s1->a53_caption) {
2278                 uint8_t field1 = !!(p[4] & 0x80);
2279                 uint8_t *cap = s1->a53_caption;
2280                 p += 5;
2281                 for (i = 0; i < cc_count; i++) {
2282                     cap[0] = (p[0] == 0xff && field1) ? 0xfc : 0xfd;
2283                     cap[1] = p[1];
2284                     cap[2] = p[2];
2285                     cap[3] = (p[3] == 0xff && !field1) ? 0xfc : 0xfd;
2286                     cap[4] = p[4];
2287                     cap[5] = p[5];
2288                     cap += 6;
2289                     p += 6;
2290                 }
2291             }
2292         }
2293         return 1;
2294     }
2295     return 0;
2296 }
2297
2298 static void mpeg_decode_user_data(AVCodecContext *avctx,
2299                                   const uint8_t *p, int buf_size)
2300 {
2301     Mpeg1Context *s = avctx->priv_data;
2302     const uint8_t *buf_end = p + buf_size;
2303     Mpeg1Context *s1 = avctx->priv_data;
2304
2305     if (buf_size > 29){
2306         int i;
2307         for(i=0; i<20; i++)
2308             if (!memcmp(p+i, "\0TMPGEXS\0", 9)){
2309                 s->tmpgexs= 1;
2310             }
2311
2312 /*        for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i<buf_size; i++){
2313             av_log(avctx, AV_LOG_ERROR, "%c", p[i]);
2314         }
2315             av_log(avctx, AV_LOG_ERROR, "\n");*/
2316     }
2317
2318     /* we parse the DTG active format information */
2319     if (buf_end - p >= 5 &&
2320         p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2321         int flags = p[4];
2322         p += 5;
2323         if (flags & 0x80) {
2324             /* skip event id */
2325             p += 2;
2326         }
2327         if (flags & 0x40) {
2328             if (buf_end - p < 1)
2329                 return;
2330 #if FF_API_AFD
2331 FF_DISABLE_DEPRECATION_WARNINGS
2332             avctx->dtg_active_format = p[0] & 0x0f;
2333 FF_ENABLE_DEPRECATION_WARNINGS
2334 #endif /* FF_API_AFD */
2335             s1->has_afd = 1;
2336             s1->afd     = p[0] & 0x0f;
2337         }
2338     } else if (buf_end - p >= 6 &&
2339                p[0] == 'J' && p[1] == 'P' && p[2] == '3' && p[3] == 'D' &&
2340                p[4] == 0x03) { // S3D_video_format_length
2341         // the 0x7F mask ignores the reserved_bit value
2342         const uint8_t S3D_video_format_type = p[5] & 0x7F;
2343
2344         if (S3D_video_format_type == 0x03 ||
2345             S3D_video_format_type == 0x04 ||
2346             S3D_video_format_type == 0x08 ||
2347             S3D_video_format_type == 0x23) {
2348
2349             s1->has_stereo3d = 1;
2350
2351             switch (S3D_video_format_type) {
2352             case 0x03:
2353                 s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE;
2354                 break;
2355             case 0x04:
2356                 s1->stereo3d.type = AV_STEREO3D_TOPBOTTOM;
2357                 break;
2358             case 0x08:
2359                 s1->stereo3d.type = AV_STEREO3D_2D;
2360                 break;
2361             case 0x23:
2362                 s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE_QUINCUNX;
2363                 break;
2364             }
2365         }
2366     } else if (mpeg_decode_a53_cc(avctx, p, buf_size)) {
2367         return;
2368     }
2369 }
2370
2371 static void mpeg_decode_gop(AVCodecContext *avctx,
2372                             const uint8_t *buf, int buf_size)
2373 {
2374     Mpeg1Context *s1  = avctx->priv_data;
2375     MpegEncContext *s = &s1->mpeg_enc_ctx;
2376     int broken_link;
2377     int64_t tc;
2378
2379     init_get_bits(&s->gb, buf, buf_size * 8);
2380
2381     tc = avctx->timecode_frame_start = get_bits(&s->gb, 25);
2382
2383     s->closed_gop = get_bits1(&s->gb);
2384     /* broken_link indicate that after editing the
2385      * reference frames of the first B-Frames after GOP I-Frame
2386      * are missing (open gop) */
2387     broken_link = get_bits1(&s->gb);
2388
2389     if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2390         char tcbuf[AV_TIMECODE_STR_SIZE];
2391         av_timecode_make_mpeg_tc_string(tcbuf, tc);
2392         av_log(s->avctx, AV_LOG_DEBUG,
2393                "GOP (%s) closed_gop=%d broken_link=%d\n",
2394                tcbuf, s->closed_gop, broken_link);
2395     }
2396 }
2397
2398 static int decode_chunks(AVCodecContext *avctx, AVFrame *picture,
2399                          int *got_output, const uint8_t *buf, int buf_size)
2400 {
2401     Mpeg1Context *s = avctx->priv_data;
2402     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2403     const uint8_t *buf_ptr = buf;
2404     const uint8_t *buf_end = buf + buf_size;
2405     int ret, input_size;
2406     int last_code = 0, skip_frame = 0;
2407     int picture_start_code_seen = 0;
2408
2409     for (;;) {
2410         /* find next start code */
2411         uint32_t start_code = -1;
2412         buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
2413         if (start_code > 0x1ff) {
2414             if (!skip_frame) {
2415                 if (HAVE_THREADS &&
2416                     (avctx->active_thread_type & FF_THREAD_SLICE) &&
2417                     !avctx->hwaccel) {
2418                     int i;
2419                     av_assert0(avctx->thread_count > 1);
2420
2421                     avctx->execute(avctx, slice_decode_thread,
2422                                    &s2->thread_context[0], NULL,
2423                                    s->slice_count, sizeof(void *));
2424                     for (i = 0; i < s->slice_count; i++)
2425                         s2->er.error_count += s2->thread_context[i]->er.error_count;
2426                 }
2427
2428                 if ((CONFIG_MPEG_VDPAU_DECODER || CONFIG_MPEG1_VDPAU_DECODER)
2429                     && uses_vdpau(avctx))
2430                     ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2431
2432                 ret = slice_end(avctx, picture);
2433                 if (ret < 0)
2434                     return ret;
2435                 else if (ret) {
2436                     // FIXME: merge with the stuff in mpeg_decode_slice
2437                     if (s2->last_picture_ptr || s2->low_delay)
2438                         *got_output = 1;
2439                 }
2440             }
2441             s2->pict_type = 0;
2442
2443             if (avctx->err_recognition & AV_EF_EXPLODE && s2->er.error_count)
2444                 return AVERROR_INVALIDDATA;
2445
2446             return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2447         }
2448
2449         input_size = buf_end - buf_ptr;
2450
2451         if (avctx->debug & FF_DEBUG_STARTCODE)
2452             av_log(avctx, AV_LOG_DEBUG, "%3"PRIX32" at %"PTRDIFF_SPECIFIER" left %d\n",
2453                    start_code, buf_ptr - buf, input_size);
2454
2455         /* prepare data for next start code */
2456         switch (start_code) {
2457         case SEQ_START_CODE:
2458             if (last_code == 0) {
2459                 mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2460                 if (buf != avctx->extradata)
2461                     s->sync = 1;
2462             } else {
2463                 av_log(avctx, AV_LOG_ERROR,
2464                        "ignoring SEQ_START_CODE after %X\n", last_code);
2465                 if (avctx->err_recognition & AV_EF_EXPLODE)
2466                     return AVERROR_INVALIDDATA;
2467             }
2468             break;
2469
2470         case PICTURE_START_CODE:
2471             if (picture_start_code_seen && s2->picture_structure == PICT_FRAME) {
2472                /* If it's a frame picture, there can't be more than one picture header.
2473                   Yet, it does happen and we need to handle it. */
2474                av_log(avctx, AV_LOG_WARNING, "ignoring extra picture following a frame-picture\n");
2475                break;
2476             }
2477             picture_start_code_seen = 1;
2478
2479             if (s2->width <= 0 || s2->height <= 0) {
2480                 av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
2481                        s2->width, s2->height);
2482                 return AVERROR_INVALIDDATA;
2483             }
2484
2485             if (s->tmpgexs){
2486                 s2->intra_dc_precision= 3;
2487                 s2->intra_matrix[0]= 1;
2488             }
2489             if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
2490                 !avctx->hwaccel && s->slice_count) {
2491                 int i;
2492
2493                 avctx->execute(avctx, slice_decode_thread,
2494                                s2->thread_context, NULL,
2495                                s->slice_count, sizeof(void *));
2496                 for (i = 0; i < s->slice_count; i++)
2497                     s2->er.error_count += s2->thread_context[i]->er.error_count;
2498                 s->slice_count = 0;
2499             }
2500             if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2501                 ret = mpeg_decode_postinit(avctx);
2502                 if (ret < 0) {
2503                     av_log(avctx, AV_LOG_ERROR,
2504                            "mpeg_decode_postinit() failure\n");
2505                     return ret;
2506                 }
2507
2508                 /* We have a complete image: we try to decompress it. */
2509                 if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2510                     s2->pict_type = 0;
2511                 s->first_slice = 1;
2512                 last_code      = PICTURE_START_CODE;
2513             } else {
2514                 av_log(avctx, AV_LOG_ERROR,
2515                        "ignoring pic after %X\n", last_code);
2516                 if (avctx->err_recognition & AV_EF_EXPLODE)
2517                     return AVERROR_INVALIDDATA;
2518             }
2519             break;
2520         case EXT_START_CODE:
2521             init_get_bits(&s2->gb, buf_ptr, input_size * 8);
2522
2523             switch (get_bits(&s2->gb, 4)) {
2524             case 0x1:
2525                 if (last_code == 0) {
2526                     mpeg_decode_sequence_extension(s);
2527                 } else {
2528                     av_log(avctx, AV_LOG_ERROR,
2529                            "ignoring seq ext after %X\n", last_code);
2530                     if (avctx->err_recognition & AV_EF_EXPLODE)
2531                         return AVERROR_INVALIDDATA;
2532                 }
2533                 break;
2534             case 0x2:
2535                 mpeg_decode_sequence_display_extension(s);
2536                 break;
2537             case 0x3:
2538                 mpeg_decode_quant_matrix_extension(s2);
2539                 break;
2540             case 0x7:
2541                 mpeg_decode_picture_display_extension(s);
2542                 break;
2543             case 0x8:
2544                 if (last_code == PICTURE_START_CODE) {
2545                     mpeg_decode_picture_coding_extension(s);
2546                 } else {
2547                     av_log(avctx, AV_LOG_ERROR,
2548                            "ignoring pic cod ext after %X\n", last_code);
2549                     if (avctx->err_recognition & AV_EF_EXPLODE)
2550                         return AVERROR_INVALIDDATA;
2551                 }
2552                 break;
2553             }
2554             break;
2555         case USER_START_CODE:
2556             mpeg_decode_user_data(avctx, buf_ptr, input_size);
2557             break;
2558         case GOP_START_CODE:
2559             if (last_code == 0) {
2560                 s2->first_field = 0;
2561                 mpeg_decode_gop(avctx, buf_ptr, input_size);
2562                 s->sync = 1;
2563             } else {
2564                 av_log(avctx, AV_LOG_ERROR,
2565                        "ignoring GOP_START_CODE after %X\n", last_code);
2566                 if (avctx->err_recognition & AV_EF_EXPLODE)
2567                     return AVERROR_INVALIDDATA;
2568             }
2569             break;
2570         default:
2571             if (start_code >= SLICE_MIN_START_CODE &&
2572                 start_code <= SLICE_MAX_START_CODE && last_code == PICTURE_START_CODE) {
2573                 if (s2->progressive_sequence && !s2->progressive_frame) {
2574                     s2->progressive_frame = 1;
2575                     av_log(s2->avctx, AV_LOG_ERROR,
2576                            "interlaced frame in progressive sequence, ignoring\n");
2577                 }
2578
2579                 if (s2->picture_structure == 0 ||
2580                     (s2->progressive_frame && s2->picture_structure != PICT_FRAME)) {
2581                     av_log(s2->avctx, AV_LOG_ERROR,
2582                            "picture_structure %d invalid, ignoring\n",
2583                            s2->picture_structure);
2584                     s2->picture_structure = PICT_FRAME;
2585                 }
2586
2587                 if (s2->progressive_sequence && !s2->frame_pred_frame_dct)
2588                     av_log(s2->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
2589
2590                 if (s2->picture_structure == PICT_FRAME) {
2591                     s2->first_field = 0;
2592                     s2->v_edge_pos  = 16 * s2->mb_height;
2593                 } else {
2594                     s2->first_field ^= 1;
2595                     s2->v_edge_pos   = 8 * s2->mb_height;
2596                     memset(s2->mbskip_table, 0, s2->mb_stride * s2->mb_height);
2597                 }
2598             }
2599             if (start_code >= SLICE_MIN_START_CODE &&
2600                 start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2601                 const int field_pic = s2->picture_structure != PICT_FRAME;
2602                 int mb_y = start_code - SLICE_MIN_START_CODE;
2603                 last_code = SLICE_MIN_START_CODE;
2604                 if (s2->codec_id != AV_CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
2605                     mb_y += (*buf_ptr&0xE0)<<2;
2606
2607                 mb_y <<= field_pic;
2608                 if (s2->picture_structure == PICT_BOTTOM_FIELD)
2609                     mb_y++;
2610
2611                 if (buf_end - buf_ptr < 2) {
2612                     av_log(s2->avctx, AV_LOG_ERROR, "slice too small\n");
2613                     return AVERROR_INVALIDDATA;
2614                 }
2615
2616                 if (mb_y >= s2->mb_height) {
2617                     av_log(s2->avctx, AV_LOG_ERROR,
2618                            "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2619                     return AVERROR_INVALIDDATA;
2620                 }
2621
2622                 if (!s2->last_picture_ptr) {
2623                     /* Skip B-frames if we do not have reference frames and
2624                      * GOP is not closed. */
2625                     if (s2->pict_type == AV_PICTURE_TYPE_B) {
2626                         if (!s2->closed_gop) {
2627                             skip_frame = 1;
2628                             break;
2629                         }
2630                     }
2631                 }
2632                 if (s2->pict_type == AV_PICTURE_TYPE_I || (s2->flags2 & CODEC_FLAG2_SHOW_ALL))
2633                     s->sync = 1;
2634                 if (!s2->next_picture_ptr) {
2635                     /* Skip P-frames if we do not have a reference frame or
2636                      * we have an invalid header. */
2637                     if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
2638                         skip_frame = 1;
2639                         break;
2640                     }
2641                 }
2642                 if ((avctx->skip_frame >= AVDISCARD_NONREF &&
2643                      s2->pict_type == AV_PICTURE_TYPE_B) ||
2644                     (avctx->skip_frame >= AVDISCARD_NONKEY &&
2645                      s2->pict_type != AV_PICTURE_TYPE_I) ||
2646                     avctx->skip_frame >= AVDISCARD_ALL) {
2647                     skip_frame = 1;
2648                     break;
2649                 }
2650
2651                 if (!s->mpeg_enc_ctx_allocated)
2652                     break;
2653
2654                 if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2655                     if (mb_y < avctx->skip_top ||
2656                         mb_y >= s2->mb_height - avctx->skip_bottom)
2657                         break;
2658                 }
2659
2660                 if (!s2->pict_type) {
2661                     av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2662                     if (avctx->err_recognition & AV_EF_EXPLODE)
2663                         return AVERROR_INVALIDDATA;
2664                     break;
2665                 }
2666
2667                 if (s->first_slice) {
2668                     skip_frame     = 0;
2669                     s->first_slice = 0;
2670                     if ((ret = mpeg_field_start(s2, buf, buf_size)) < 0)
2671                         return ret;
2672                 }
2673                 if (!s2->current_picture_ptr) {
2674                     av_log(avctx, AV_LOG_ERROR,
2675                            "current_picture not initialized\n");
2676                     return AVERROR_INVALIDDATA;
2677                 }
2678
2679                 if (uses_vdpau(avctx)) {
2680                     s->slice_count++;
2681                     break;
2682                 }
2683
2684                 if (HAVE_THREADS &&
2685                     (avctx->active_thread_type & FF_THREAD_SLICE) &&
2686                     !avctx->hwaccel) {
2687                     int threshold = (s2->mb_height * s->slice_count +
2688                                      s2->slice_context_count / 2) /
2689                                     s2->slice_context_count;
2690                     av_assert0(avctx->thread_count > 1);
2691                     if (threshold <= mb_y) {
2692                         MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2693
2694                         thread_context->start_mb_y = mb_y;
2695                         thread_context->end_mb_y   = s2->mb_height;
2696                         if (s->slice_count) {
2697                             s2->thread_context[s->slice_count - 1]->end_mb_y = mb_y;
2698                             ret = ff_update_duplicate_context(thread_context, s2);
2699                             if (ret < 0)
2700                                 return ret;
2701                         }
2702                         init_get_bits(&thread_context->gb, buf_ptr, input_size * 8);
2703                         s->slice_count++;
2704                     }
2705                     buf_ptr += 2; // FIXME add minimum number of bytes per slice
2706                 } else {
2707                     ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2708                     emms_c();
2709
2710                     if (ret < 0) {
2711                         if (avctx->err_recognition & AV_EF_EXPLODE)
2712                             return ret;
2713                         if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2714                             ff_er_add_slice(&s2->er, s2->resync_mb_x,
2715                                             s2->resync_mb_y, s2->mb_x, s2->mb_y,
2716                                             ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2717                     } else {
2718                         ff_er_add_slice(&s2->er, s2->resync_mb_x,
2719                                         s2->resync_mb_y, s2->mb_x - 1, s2->mb_y,
2720                                         ER_AC_END | ER_DC_END | ER_MV_END);
2721                     }
2722                 }
2723             }
2724             break;
2725         }
2726     }
2727 }
2728
2729 static int mpeg_decode_frame(AVCodecContext *avctx, void *data,
2730                              int *got_output, AVPacket *avpkt)
2731 {
2732     const uint8_t *buf = avpkt->data;
2733     int ret;
2734     int buf_size = avpkt->size;
2735     Mpeg1Context *s = avctx->priv_data;
2736     AVFrame *picture = data;
2737     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2738
2739     if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2740         /* special case for last picture */
2741         if (s2->low_delay == 0 && s2->next_picture_ptr) {
2742             int ret = av_frame_ref(picture, s2->next_picture_ptr->f);
2743             if (ret < 0)
2744                 return ret;
2745
2746             s2->next_picture_ptr = NULL;
2747
2748             *got_output = 1;
2749         }
2750         return buf_size;
2751     }
2752
2753     if (s2->flags & CODEC_FLAG_TRUNCATED) {
2754         int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf,
2755                                            buf_size, NULL);
2756
2757         if (ff_combine_frame(&s2->parse_context, next,
2758                              (const uint8_t **) &buf, &buf_size) < 0)
2759             return buf_size;
2760     }
2761
2762     s2->codec_tag = avpriv_toupper4(avctx->codec_tag);
2763     if (s->mpeg_enc_ctx_allocated == 0 && (   s2->codec_tag == AV_RL32("VCR2")
2764                                            || s2->codec_tag == AV_RL32("BW10")
2765                                           ))
2766         vcr2_init_sequence(avctx);
2767
2768     s->slice_count = 0;
2769
2770     if (avctx->extradata && !s->extradata_decoded) {
2771         ret = decode_chunks(avctx, picture, got_output,
2772                             avctx->extradata, avctx->extradata_size);
2773         if (*got_output) {
2774             av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
2775             *got_output = 0;
2776         }
2777         s->extradata_decoded = 1;
2778         if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) {
2779             s2->current_picture_ptr = NULL;
2780             return ret;
2781         }
2782     }
2783
2784     ret = decode_chunks(avctx, picture, got_output, buf, buf_size);
2785     if (ret<0 || *got_output)
2786         s2->current_picture_ptr = NULL;
2787
2788     return ret;
2789 }
2790
2791 static void flush(AVCodecContext *avctx)
2792 {
2793     Mpeg1Context *s = avctx->priv_data;
2794
2795     s->sync       = 0;
2796
2797     ff_mpeg_flush(avctx);
2798 }
2799
2800 static av_cold int mpeg_decode_end(AVCodecContext *avctx)
2801 {
2802     Mpeg1Context *s = avctx->priv_data;
2803
2804     if (s->mpeg_enc_ctx_allocated)
2805         ff_mpv_common_end(&s->mpeg_enc_ctx);
2806     av_freep(&s->a53_caption);
2807     return 0;
2808 }
2809
2810 static const AVProfile mpeg2_video_profiles[] = {
2811     { FF_PROFILE_MPEG2_422,          "4:2:2"              },
2812     { FF_PROFILE_MPEG2_HIGH,         "High"               },
2813     { FF_PROFILE_MPEG2_SS,           "Spatially Scalable" },
2814     { FF_PROFILE_MPEG2_SNR_SCALABLE, "SNR Scalable"       },
2815     { FF_PROFILE_MPEG2_MAIN,         "Main"               },
2816     { FF_PROFILE_MPEG2_SIMPLE,       "Simple"             },
2817     { FF_PROFILE_RESERVED,           "Reserved"           },
2818     { FF_PROFILE_RESERVED,           "Reserved"           },
2819     { FF_PROFILE_UNKNOWN                                  },
2820 };
2821
2822 AVCodec ff_mpeg1video_decoder = {
2823     .name                  = "mpeg1video",
2824     .long_name             = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2825     .type                  = AVMEDIA_TYPE_VIDEO,
2826     .id                    = AV_CODEC_ID_MPEG1VIDEO,
2827     .priv_data_size        = sizeof(Mpeg1Context),
2828     .init                  = mpeg_decode_init,
2829     .close                 = mpeg_decode_end,
2830     .decode                = mpeg_decode_frame,
2831     .capabilities          = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2832                              CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2833                              CODEC_CAP_SLICE_THREADS,
2834     .flush                 = flush,
2835     .max_lowres            = 3,
2836     .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context)
2837 };
2838
2839 AVCodec ff_mpeg2video_decoder = {
2840     .name           = "mpeg2video",
2841     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2842     .type           = AVMEDIA_TYPE_VIDEO,
2843     .id             = AV_CODEC_ID_MPEG2VIDEO,
2844     .priv_data_size = sizeof(Mpeg1Context),
2845     .init           = mpeg_decode_init,
2846     .close          = mpeg_decode_end,
2847     .decode         = mpeg_decode_frame,
2848     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2849                       CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2850                       CODEC_CAP_SLICE_THREADS,
2851     .flush          = flush,
2852     .max_lowres     = 3,
2853     .profiles       = NULL_IF_CONFIG_SMALL(mpeg2_video_profiles),
2854 };
2855
2856 //legacy decoder
2857 AVCodec ff_mpegvideo_decoder = {
2858     .name           = "mpegvideo",
2859     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2860     .type           = AVMEDIA_TYPE_VIDEO,
2861     .id             = AV_CODEC_ID_MPEG2VIDEO,
2862     .priv_data_size = sizeof(Mpeg1Context),
2863     .init           = mpeg_decode_init,
2864     .close          = mpeg_decode_end,
2865     .decode         = mpeg_decode_frame,
2866     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
2867     .flush          = flush,
2868     .max_lowres     = 3,
2869 };
2870
2871 #if FF_API_XVMC
2872 #if CONFIG_MPEG_XVMC_DECODER
2873 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx)
2874 {
2875     if (avctx->active_thread_type & FF_THREAD_SLICE)
2876         return -1;
2877     if (!(avctx->slice_flags & SLICE_FLAG_CODED_ORDER))
2878         return -1;
2879     if (!(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
2880         av_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2881     }
2882     mpeg_decode_init(avctx);
2883
2884     avctx->pix_fmt           = AV_PIX_FMT_XVMC_MPEG2_IDCT;
2885     avctx->xvmc_acceleration = 2; // 2 - the blocks are packed!
2886
2887     return 0;
2888 }
2889
2890 AVCodec ff_mpeg_xvmc_decoder = {
2891     .name           = "mpegvideo_xvmc",
2892     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2893     .type           = AVMEDIA_TYPE_VIDEO,
2894     .id             = AV_CODEC_ID_MPEG2VIDEO_XVMC,
2895     .priv_data_size = sizeof(Mpeg1Context),
2896     .init           = mpeg_mc_decode_init,
2897     .close          = mpeg_decode_end,
2898     .decode         = mpeg_decode_frame,
2899     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2900                       CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2901     .flush          = flush,
2902 };
2903
2904 #endif
2905 #endif /* FF_API_XVMC */
2906
2907 #if CONFIG_MPEG_VDPAU_DECODER
2908 AVCodec ff_mpeg_vdpau_decoder = {
2909     .name           = "mpegvideo_vdpau",
2910     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2911     .type           = AVMEDIA_TYPE_VIDEO,
2912     .id             = AV_CODEC_ID_MPEG2VIDEO,
2913     .priv_data_size = sizeof(Mpeg1Context),
2914     .init           = mpeg_decode_init,
2915     .close          = mpeg_decode_end,
2916     .decode         = mpeg_decode_frame,
2917     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2918                       CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2919     .flush          = flush,
2920 };
2921 #endif
2922
2923 #if CONFIG_MPEG1_VDPAU_DECODER
2924 AVCodec ff_mpeg1_vdpau_decoder = {
2925     .name           = "mpeg1video_vdpau",
2926     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
2927     .type           = AVMEDIA_TYPE_VIDEO,
2928     .id             = AV_CODEC_ID_MPEG1VIDEO,
2929     .priv_data_size = sizeof(Mpeg1Context),
2930     .init           = mpeg_decode_init,
2931     .close          = mpeg_decode_end,
2932     .decode         = mpeg_decode_frame,
2933     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2934                       CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2935     .flush          = flush,
2936 };
2937 #endif