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   1 /*
   2  * MPEG-1/2 decoder
   3  * Copyright (c) 2000, 2001 Fabrice Bellard
   4  * Copyright (c) 2002-2013 Michael Niedermayer <michaelni@gmx.at>
   5  *
   6  * This file is part of FFmpeg.
   7  *
   8  * FFmpeg is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * FFmpeg is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with FFmpeg; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 /**
  24  * @file
  25  * MPEG-1/2 decoder
  26  */
  27
  28 #define UNCHECKED_BITSTREAM_READER 1
  29 #include <inttypes.h>
  30
  31 #include "libavutil/attributes.h"
  32 #include "libavutil/imgutils.h"
  33 #include "libavutil/internal.h"
  34 #include "libavutil/mem_internal.h"
  35 #include "libavutil/stereo3d.h"
  36 #include "libavutil/video_enc_params.h"
  37
  38 #include "avcodec.h"
  39 #include "bytestream.h"
  40 #include "error_resilience.h"
  41 #include "hwconfig.h"
  42 #include "idctdsp.h"
  43 #include "internal.h"
  44 #include "mpeg_er.h"
  45 #include "mpeg12.h"
  46 #include "mpeg12data.h"
  47 #include "mpegutils.h"
  48 #include "mpegvideo.h"
  49 #include "mpegvideodata.h"
  50 #include "profiles.h"
  51 #include "thread.h"
  52 #include "xvmc_internal.h"
  53
  54 #define A53_MAX_CC_COUNT 2000
  55
  56 typedef struct Mpeg1Context {
  57     MpegEncContext mpeg_enc_ctx;
  58     int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
  59     int repeat_field;           /* true if we must repeat the field */
  60     AVPanScan pan_scan;         /* some temporary storage for the panscan */
  61     AVStereo3D stereo3d;
  62     int has_stereo3d;
  63     AVBufferRef *a53_buf_ref;
  64     uint8_t afd;
  65     int has_afd;
  66     int slice_count;
  67     AVRational save_aspect;
  68     int save_width, save_height, save_progressive_seq;
  69     int rc_buffer_size;
  70     AVRational frame_rate_ext;  /* MPEG-2 specific framerate modificator */
  71     int sync;                   /* Did we reach a sync point like a GOP/SEQ/KEYFrame? */
  72     int tmpgexs;
  73     int first_slice;
  74     int extradata_decoded;
  75 } Mpeg1Context;
  76
  77 #define MB_TYPE_ZERO_MV   0x20000000
  78
  79 static const uint32_t ptype2mb_type[7] = {
  80                     MB_TYPE_INTRA,
  81                     MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
  82                     MB_TYPE_L0,
  83                     MB_TYPE_L0 | MB_TYPE_CBP,
  84     MB_TYPE_QUANT | MB_TYPE_INTRA,
  85     MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
  86     MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
  87 };
  88
  89 static const uint32_t btype2mb_type[11] = {
  90                     MB_TYPE_INTRA,
  91                     MB_TYPE_L1,
  92                     MB_TYPE_L1   | MB_TYPE_CBP,
  93                     MB_TYPE_L0,
  94                     MB_TYPE_L0   | MB_TYPE_CBP,
  95                     MB_TYPE_L0L1,
  96                     MB_TYPE_L0L1 | MB_TYPE_CBP,
  97     MB_TYPE_QUANT | MB_TYPE_INTRA,
  98     MB_TYPE_QUANT | MB_TYPE_L1   | MB_TYPE_CBP,
  99     MB_TYPE_QUANT | MB_TYPE_L0   | MB_TYPE_CBP,
 100     MB_TYPE_QUANT | MB_TYPE_L0L1 | MB_TYPE_CBP,
 101 };
 102
 103 /* as H.263, but only 17 codes */
 104 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
 105 {
 106     int code, sign, val, shift;
 107
 108     code = get_vlc2(&s->gb, ff_mv_vlc.table, MV_VLC_BITS, 2);
 109     if (code == 0)
 110         return pred;
 111     if (code < 0)
 112         return 0xffff;
 113
 114     sign  = get_bits1(&s->gb);
 115     shift = fcode - 1;
 116     val   = code;
 117     if (shift) {
 118         val  = (val - 1) << shift;
 119         val |= get_bits(&s->gb, shift);
 120         val++;
 121     }
 122     if (sign)
 123         val = -val;
 124     val += pred;
 125
 126     /* modulo decoding */
 127     return sign_extend(val, 5 + shift);
 128 }
 129
 130 #define MAX_INDEX (64 - 1)
 131 #define check_scantable_index(ctx, x)                                         \
 132     do {                                                                      \
 133         if ((x) > MAX_INDEX) {                                                \
 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_inter(MpegEncContext *s,
 141                                            int16_t *block, int n)
 142 {
 143     int level, i, j, run;
 144     RLTable *rl                  = &ff_rl_mpeg1;
 145     uint8_t *const scantable     = s->intra_scantable.permutated;
 146     const uint16_t *quant_matrix = s->inter_matrix;
 147     const int qscale             = s->qscale;
 148
 149     {
 150         OPEN_READER(re, &s->gb);
 151         i = -1;
 152         // special case for first coefficient, no need to add second VLC table
 153         UPDATE_CACHE(re, &s->gb);
 154         if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
 155             level = (3 * qscale * quant_matrix[0]) >> 5;
 156             level = (level - 1) | 1;
 157             if (GET_CACHE(re, &s->gb) & 0x40000000)
 158                 level = -level;
 159             block[0] = level;
 160             i++;
 161             SKIP_BITS(re, &s->gb, 2);
 162             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
 163                 goto end;
 164         }
 165         /* now quantify & encode AC coefficients */
 166         for (;;) {
 167             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
 168                        TEX_VLC_BITS, 2, 0);
 169
 170             if (level != 0) {
 171                 i += run;
 172                 if (i > MAX_INDEX)
 173                     break;
 174                 j = scantable[i];
 175                 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 176                 level = (level - 1) | 1;
 177                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
 178                         SHOW_SBITS(re, &s->gb, 1);
 179                 SKIP_BITS(re, &s->gb, 1);
 180             } else {
 181                 /* escape */
 182                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
 183                 LAST_SKIP_BITS(re, &s->gb, 6);
 184                 UPDATE_CACHE(re, &s->gb);
 185                 level = SHOW_SBITS(re, &s->gb, 8);
 186                 SKIP_BITS(re, &s->gb, 8);
 187                 if (level == -128) {
 188                     level = SHOW_UBITS(re, &s->gb, 8) - 256;
 189                     SKIP_BITS(re, &s->gb, 8);
 190                 } else if (level == 0) {
 191                     level = SHOW_UBITS(re, &s->gb, 8);
 192                     SKIP_BITS(re, &s->gb, 8);
 193                 }
 194                 i += run;
 195                 if (i > MAX_INDEX)
 196                     break;
 197                 j = scantable[i];
 198                 if (level < 0) {
 199                     level = -level;
 200                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 201                     level = (level - 1) | 1;
 202                     level = -level;
 203                 } else {
 204                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 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             UPDATE_CACHE(re, &s->gb);
 213         }
 214 end:
 215         LAST_SKIP_BITS(re, &s->gb, 2);
 216         CLOSE_READER(re, &s->gb);
 217     }
 218
 219     check_scantable_index(s, i);
 220
 221     s->block_last_index[n] = i;
 222     return 0;
 223 }
 224
 225 /**
 226  * Changing this would eat up any speed benefits it has.
 227  * Do not use "fast" flag if you need the code to be robust.
 228  */
 229 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s,
 230                                                 int16_t *block, int n)
 231 {
 232     int level, i, j, run;
 233     RLTable *rl              = &ff_rl_mpeg1;
 234     uint8_t *const scantable = s->intra_scantable.permutated;
 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) >> 1;
 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
 254         /* now quantify & encode AC coefficients */
 255         for (;;) {
 256             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
 257                        TEX_VLC_BITS, 2, 0);
 258
 259             if (level != 0) {
 260                 i += run;
 261                 if (i > MAX_INDEX)
 262                     break;
 263                 j = scantable[i];
 264                 level = ((level * 2 + 1) * qscale) >> 1;
 265                 level = (level - 1) | 1;
 266                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
 267                         SHOW_SBITS(re, &s->gb, 1);
 268                 SKIP_BITS(re, &s->gb, 1);
 269             } else {
 270                 /* escape */
 271                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
 272                 LAST_SKIP_BITS(re, &s->gb, 6);
 273                 UPDATE_CACHE(re, &s->gb);
 274                 level = SHOW_SBITS(re, &s->gb, 8);
 275                 SKIP_BITS(re, &s->gb, 8);
 276                 if (level == -128) {
 277                     level = SHOW_UBITS(re, &s->gb, 8) - 256;
 278                     SKIP_BITS(re, &s->gb, 8);
 279                 } else if (level == 0) {
 280                     level = SHOW_UBITS(re, &s->gb, 8);
 281                     SKIP_BITS(re, &s->gb, 8);
 282                 }
 283                 i += run;
 284                 if (i > MAX_INDEX)
 285                     break;
 286                 j = scantable[i];
 287                 if (level < 0) {
 288                     level = -level;
 289                     level = ((level * 2 + 1) * qscale) >> 1;
 290                     level = (level - 1) | 1;
 291                     level = -level;
 292                 } else {
 293                     level = ((level * 2 + 1) * qscale) >> 1;
 294                     level = (level - 1) | 1;
 295                 }
 296             }
 297
 298             block[j] = level;
 299             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
 300                 break;
 301             UPDATE_CACHE(re, &s->gb);
 302         }
 303 end:
 304         LAST_SKIP_BITS(re, &s->gb, 2);
 305         CLOSE_READER(re, &s->gb);
 306     }
 307
 308     check_scantable_index(s, i);
 309
 310     s->block_last_index[n] = i;
 311     return 0;
 312 }
 313
 314 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
 315                                                int16_t *block, int n)
 316 {
 317     int level, i, j, run;
 318     RLTable *rl = &ff_rl_mpeg1;
 319     uint8_t *const scantable = s->intra_scantable.permutated;
 320     const uint16_t *quant_matrix;
 321     const int qscale = s->qscale;
 322     int mismatch;
 323
 324     mismatch = 1;
 325
 326     {
 327         OPEN_READER(re, &s->gb);
 328         i = -1;
 329         if (n < 4)
 330             quant_matrix = s->inter_matrix;
 331         else
 332             quant_matrix = s->chroma_inter_matrix;
 333
 334         // Special case for first coefficient, no need to add second VLC table.
 335         UPDATE_CACHE(re, &s->gb);
 336         if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
 337             level = (3 * qscale * quant_matrix[0]) >> 5;
 338             if (GET_CACHE(re, &s->gb) & 0x40000000)
 339                 level = -level;
 340             block[0]  = level;
 341             mismatch ^= level;
 342             i++;
 343             SKIP_BITS(re, &s->gb, 2);
 344             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
 345                 goto end;
 346         }
 347
 348         /* now quantify & encode AC coefficients */
 349         for (;;) {
 350             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
 351                        TEX_VLC_BITS, 2, 0);
 352
 353             if (level != 0) {
 354                 i += run;
 355                 if (i > MAX_INDEX)
 356                     break;
 357                 j = scantable[i];
 358                 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 359                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
 360                         SHOW_SBITS(re, &s->gb, 1);
 361                 SKIP_BITS(re, &s->gb, 1);
 362             } else {
 363                 /* escape */
 364                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
 365                 LAST_SKIP_BITS(re, &s->gb, 6);
 366                 UPDATE_CACHE(re, &s->gb);
 367                 level = SHOW_SBITS(re, &s->gb, 12);
 368                 SKIP_BITS(re, &s->gb, 12);
 369
 370                 i += run;
 371                 if (i > MAX_INDEX)
 372                     break;
 373                 j = scantable[i];
 374                 if (level < 0) {
 375                     level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 376                     level = -level;
 377                 } else {
 378                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 379                 }
 380             }
 381
 382             mismatch ^= level;
 383             block[j]  = level;
 384             if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
 385                 break;
 386             UPDATE_CACHE(re, &s->gb);
 387         }
 388 end:
 389         LAST_SKIP_BITS(re, &s->gb, 2);
 390         CLOSE_READER(re, &s->gb);
 391     }
 392     block[63] ^= (mismatch & 1);
 393
 394     check_scantable_index(s, i);
 395
 396     s->block_last_index[n] = i;
 397     return 0;
 398 }
 399
 400 /**
 401  * Changing this would eat up any speed benefits it has.
 402  * Do not use "fast" flag if you need the code to be robust.
 403  */
 404 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
 405                                                     int16_t *block, int n)
 406 {
 407     int level, i, j, run;
 408     RLTable *rl              = &ff_rl_mpeg1;
 409     uint8_t *const scantable = s->intra_scantable.permutated;
 410     const int qscale         = s->qscale;
 411     OPEN_READER(re, &s->gb);
 412     i = -1;
 413
 414     // special case for first coefficient, no need to add second VLC table
 415     UPDATE_CACHE(re, &s->gb);
 416     if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
 417         level = (3 * qscale) >> 1;
 418         if (GET_CACHE(re, &s->gb) & 0x40000000)
 419             level = -level;
 420         block[0] = 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], TEX_VLC_BITS, 2, 0);
 430
 431         if (level != 0) {
 432             i += run;
 433             if (i > MAX_INDEX)
 434                 break;
 435             j = scantable[i];
 436             level = ((level * 2 + 1) * qscale) >> 1;
 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             if (i > MAX_INDEX)
 450                 break;
 451             j = scantable[i];
 452             if (level < 0) {
 453                 level = ((-level * 2 + 1) * qscale) >> 1;
 454                 level = -level;
 455             } else {
 456                 level = ((level * 2 + 1) * qscale) >> 1;
 457             }
 458         }
 459
 460         block[j] = level;
 461         if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF || i > 63)
 462             break;
 463
 464         UPDATE_CACHE(re, &s->gb);
 465     }
 466 end:
 467     LAST_SKIP_BITS(re, &s->gb, 2);
 468     CLOSE_READER(re, &s->gb);
 469
 470     check_scantable_index(s, i);
 471
 472     s->block_last_index[n] = i;
 473     return 0;
 474 }
 475
 476 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
 477                                            int16_t *block, int n)
 478 {
 479     int level, dc, diff, i, j, run;
 480     int component;
 481     RLTable *rl;
 482     uint8_t *const scantable = s->intra_scantable.permutated;
 483     const uint16_t *quant_matrix;
 484     const int qscale = s->qscale;
 485     int mismatch;
 486
 487     /* DC coefficient */
 488     if (n < 4) {
 489         quant_matrix = s->intra_matrix;
 490         component    = 0;
 491     } else {
 492         quant_matrix = s->chroma_intra_matrix;
 493         component    = (n & 1) + 1;
 494     }
 495     diff = decode_dc(&s->gb, component);
 496     dc  = s->last_dc[component];
 497     dc += diff;
 498     s->last_dc[component] = dc;
 499     block[0] = dc * (1 << (3 - s->intra_dc_precision));
 500     ff_tlog(s->avctx, "dc=%d\n", block[0]);
 501     mismatch = block[0] ^ 1;
 502     i = 0;
 503     if (s->intra_vlc_format)
 504         rl = &ff_rl_mpeg2;
 505     else
 506         rl = &ff_rl_mpeg1;
 507
 508     {
 509         OPEN_READER(re, &s->gb);
 510         /* now quantify & encode AC coefficients */
 511         for (;;) {
 512             UPDATE_CACHE(re, &s->gb);
 513             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
 514                        TEX_VLC_BITS, 2, 0);
 515
 516             if (level == 127) {
 517                 break;
 518             } else if (level != 0) {
 519                 i += run;
 520                 if (i > MAX_INDEX)
 521                     break;
 522                 j = scantable[i];
 523                 level = (level * qscale * quant_matrix[j]) >> 4;
 524                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
 525                         SHOW_SBITS(re, &s->gb, 1);
 526                 LAST_SKIP_BITS(re, &s->gb, 1);
 527             } else {
 528                 /* escape */
 529                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
 530                 SKIP_BITS(re, &s->gb, 6);
 531                 level = SHOW_SBITS(re, &s->gb, 12);
 532                 LAST_SKIP_BITS(re, &s->gb, 12);
 533                 i += run;
 534                 if (i > MAX_INDEX)
 535                     break;
 536                 j = scantable[i];
 537                 if (level < 0) {
 538                     level = (-level * qscale * quant_matrix[j]) >> 4;
 539                     level = -level;
 540                 } else {
 541                     level = (level * qscale * quant_matrix[j]) >> 4;
 542                 }
 543             }
 544
 545             mismatch ^= level;
 546             block[j]  = level;
 547         }
 548         CLOSE_READER(re, &s->gb);
 549     }
 550     block[63] ^= mismatch & 1;
 551
 552     check_scantable_index(s, i);
 553
 554     s->block_last_index[n] = i;
 555     return 0;
 556 }
 557
 558 /**
 559  * Changing this would eat up any speed benefits it has.
 560  * Do not use "fast" flag if you need the code to be robust.
 561  */
 562 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
 563                                                 int16_t *block, int n)
 564 {
 565     int level, dc, diff, i, j, run;
 566     int component;
 567     RLTable *rl;
 568     uint8_t *const scantable = s->intra_scantable.permutated;
 569     const uint16_t *quant_matrix;
 570     const int qscale = s->qscale;
 571
 572     /* DC coefficient */
 573     if (n < 4) {
 574         quant_matrix = s->intra_matrix;
 575         component    = 0;
 576     } else {
 577         quant_matrix = s->chroma_intra_matrix;
 578         component    = (n & 1) + 1;
 579     }
 580     diff = decode_dc(&s->gb, component);
 581     dc = s->last_dc[component];
 582     dc += diff;
 583     s->last_dc[component] = dc;
 584     block[0] = dc * (1 << (3 - s->intra_dc_precision));
 585     i = 0;
 586     if (s->intra_vlc_format)
 587         rl = &ff_rl_mpeg2;
 588     else
 589         rl = &ff_rl_mpeg1;
 590
 591     {
 592         OPEN_READER(re, &s->gb);
 593         /* now quantify & encode AC coefficients */
 594         for (;;) {
 595             UPDATE_CACHE(re, &s->gb);
 596             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
 597                        TEX_VLC_BITS, 2, 0);
 598
 599             if (level >= 64 || i > 63) {
 600                 break;
 601             } else if (level != 0) {
 602                 i += run;
 603                 j = scantable[i];
 604                 level = (level * qscale * quant_matrix[j]) >> 4;
 605                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
 606                         SHOW_SBITS(re, &s->gb, 1);
 607                 LAST_SKIP_BITS(re, &s->gb, 1);
 608             } else {
 609                 /* escape */
 610                 run = SHOW_UBITS(re, &s->gb, 6) + 1;
 611                 SKIP_BITS(re, &s->gb, 6);
 612                 level = SHOW_SBITS(re, &s->gb, 12);
 613                 LAST_SKIP_BITS(re, &s->gb, 12);
 614                 i += run;
 615                 j = scantable[i];
 616                 if (level < 0) {
 617                     level = (-level * qscale * quant_matrix[j]) >> 4;
 618                     level = -level;
 619                 } else {
 620                     level = (level * qscale * quant_matrix[j]) >> 4;
 621                 }
 622             }
 623
 624             block[j] = level;
 625         }
 626         CLOSE_READER(re, &s->gb);
 627     }
 628
 629     check_scantable_index(s, i);
 630
 631     s->block_last_index[n] = i;
 632     return 0;
 633 }
 634
 635 /******************************************/
 636 /* decoding */
 637
 638 static inline int get_dmv(MpegEncContext *s)
 639 {
 640     if (get_bits1(&s->gb))
 641         return 1 - (get_bits1(&s->gb) << 1);
 642     else
 643         return 0;
 644 }
 645
 646 /* motion type (for MPEG-2) */
 647 #define MT_FIELD 1
 648 #define MT_FRAME 2
 649 #define MT_16X8  2
 650 #define MT_DMV   3
 651
 652 static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
 653 {
 654     int i, j, k, cbp, val, mb_type, motion_type;
 655     const int mb_block_count = 4 + (1 << s->chroma_format);
 656     int ret;
 657
 658     ff_tlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
 659
 660     av_assert2(s->mb_skipped == 0);
 661
 662     if (s->mb_skip_run-- != 0) {
 663         if (s->pict_type == AV_PICTURE_TYPE_P) {
 664             s->mb_skipped = 1;
 665             s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
 666                 MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
 667         } else {
 668             int mb_type;
 669
 670             if (s->mb_x)
 671                 mb_type = s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
 672             else
 673                 // FIXME not sure if this is allowed in MPEG at all
 674                 mb_type = s->current_picture.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1];
 675             if (IS_INTRA(mb_type)) {
 676                 av_log(s->avctx, AV_LOG_ERROR, "skip with previntra\n");
 677                 return AVERROR_INVALIDDATA;
 678             }
 679             s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
 680                 mb_type | MB_TYPE_SKIP;
 681
 682             if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
 683                 s->mb_skipped = 1;
 684         }
 685
 686         return 0;
 687     }
 688
 689     switch (s->pict_type) {
 690     default:
 691     case AV_PICTURE_TYPE_I:
 692         if (get_bits1(&s->gb) == 0) {
 693             if (get_bits1(&s->gb) == 0) {
 694                 av_log(s->avctx, AV_LOG_ERROR,
 695                        "Invalid mb type in I-frame at %d %d\n",
 696                        s->mb_x, s->mb_y);
 697                 return AVERROR_INVALIDDATA;
 698             }
 699             mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
 700         } else {
 701             mb_type = MB_TYPE_INTRA;
 702         }
 703         break;
 704     case AV_PICTURE_TYPE_P:
 705         mb_type = get_vlc2(&s->gb, ff_mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
 706         if (mb_type < 0) {
 707             av_log(s->avctx, AV_LOG_ERROR,
 708                    "Invalid mb type in P-frame at %d %d\n", s->mb_x, s->mb_y);
 709             return AVERROR_INVALIDDATA;
 710         }
 711         mb_type = ptype2mb_type[mb_type];
 712         break;
 713     case AV_PICTURE_TYPE_B:
 714         mb_type = get_vlc2(&s->gb, ff_mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
 715         if (mb_type < 0) {
 716             av_log(s->avctx, AV_LOG_ERROR,
 717                    "Invalid mb type in B-frame at %d %d\n", s->mb_x, s->mb_y);
 718             return AVERROR_INVALIDDATA;
 719         }
 720         mb_type = btype2mb_type[mb_type];
 721         break;
 722     }
 723     ff_tlog(s->avctx, "mb_type=%x\n", mb_type);
 724 //    motion_type = 0; /* avoid warning */
 725     if (IS_INTRA(mb_type)) {
 726         s->bdsp.clear_blocks(s->block[0]);
 727
 728         if (!s->chroma_y_shift)
 729             s->bdsp.clear_blocks(s->block[6]);
 730
 731         /* compute DCT type */
 732         // FIXME: add an interlaced_dct coded var?
 733         if (s->picture_structure == PICT_FRAME &&
 734             !s->frame_pred_frame_dct)
 735             s->interlaced_dct = get_bits1(&s->gb);
 736
 737         if (IS_QUANT(mb_type))
 738             s->qscale = mpeg_get_qscale(s);
 739
 740         if (s->concealment_motion_vectors) {
 741             /* just parse them */
 742             if (s->picture_structure != PICT_FRAME)
 743                 skip_bits1(&s->gb);  /* field select */
 744
 745             s->mv[0][0][0]      =
 746             s->last_mv[0][0][0] =
 747             s->last_mv[0][1][0] = mpeg_decode_motion(s, s->mpeg_f_code[0][0],
 748                                                      s->last_mv[0][0][0]);
 749             s->mv[0][0][1]      =
 750             s->last_mv[0][0][1] =
 751             s->last_mv[0][1][1] = mpeg_decode_motion(s, s->mpeg_f_code[0][1],
 752                                                      s->last_mv[0][0][1]);
 753
 754             check_marker(s->avctx, &s->gb, "after concealment_motion_vectors");
 755         } else {
 756             /* reset mv prediction */
 757             memset(s->last_mv, 0, sizeof(s->last_mv));
 758         }
 759         s->mb_intra = 1;
 760         // if 1, we memcpy blocks in xvmcvideo
 761         if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
 762             ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
 763
 764         if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
 765             if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
 766                 for (i = 0; i < 6; i++)
 767                     mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
 768             } else {
 769                 for (i = 0; i < mb_block_count; i++)
 770                     if ((ret = mpeg2_decode_block_intra(s, *s->pblocks[i], i)) < 0)
 771                         return ret;
 772             }
 773         } else {
 774             for (i = 0; i < 6; i++) {
 775                 ret = ff_mpeg1_decode_block_intra(&s->gb,
 776                                                   s->intra_matrix,
 777                                                   s->intra_scantable.permutated,
 778                                                   s->last_dc, *s->pblocks[i],
 779                                                   i, s->qscale);
 780                 if (ret < 0) {
 781                     av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n",
 782                            s->mb_x, s->mb_y);
 783                     return ret;
 784                 }
 785
 786                 s->block_last_index[i] = ret;
 787             }
 788         }
 789     } else {
 790         if (mb_type & MB_TYPE_ZERO_MV) {
 791             av_assert2(mb_type & MB_TYPE_CBP);
 792
 793             s->mv_dir = MV_DIR_FORWARD;
 794             if (s->picture_structure == PICT_FRAME) {
 795                 if (s->picture_structure == PICT_FRAME
 796                     && !s->frame_pred_frame_dct)
 797                     s->interlaced_dct = get_bits1(&s->gb);
 798                 s->mv_type = MV_TYPE_16X16;
 799             } else {
 800                 s->mv_type            = MV_TYPE_FIELD;
 801                 mb_type              |= MB_TYPE_INTERLACED;
 802                 s->field_select[0][0] = s->picture_structure - 1;
 803             }
 804
 805             if (IS_QUANT(mb_type))
 806                 s->qscale = mpeg_get_qscale(s);
 807
 808             s->last_mv[0][0][0] = 0;
 809             s->last_mv[0][0][1] = 0;
 810             s->last_mv[0][1][0] = 0;
 811             s->last_mv[0][1][1] = 0;
 812             s->mv[0][0][0]      = 0;
 813             s->mv[0][0][1]      = 0;
 814         } else {
 815             av_assert2(mb_type & MB_TYPE_L0L1);
 816             // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
 817             /* get additional motion vector type */
 818             if (s->picture_structure == PICT_FRAME && s->frame_pred_frame_dct) {
 819                 motion_type = MT_FRAME;
 820             } else {
 821                 motion_type = get_bits(&s->gb, 2);
 822                 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
 823                     s->interlaced_dct = get_bits1(&s->gb);
 824             }
 825
 826             if (IS_QUANT(mb_type))
 827                 s->qscale = mpeg_get_qscale(s);
 828
 829             /* motion vectors */
 830             s->mv_dir = (mb_type >> 13) & 3;
 831             ff_tlog(s->avctx, "motion_type=%d\n", motion_type);
 832             switch (motion_type) {
 833             case MT_FRAME: /* or MT_16X8 */
 834                 if (s->picture_structure == PICT_FRAME) {
 835                     mb_type   |= MB_TYPE_16x16;
 836                     s->mv_type = MV_TYPE_16X16;
 837                     for (i = 0; i < 2; i++) {
 838                         if (USES_LIST(mb_type, i)) {
 839                             /* MT_FRAME */
 840                             s->mv[i][0][0]      =
 841                             s->last_mv[i][0][0] =
 842                             s->last_mv[i][1][0] =
 843                                 mpeg_decode_motion(s, s->mpeg_f_code[i][0],
 844                                                    s->last_mv[i][0][0]);
 845                             s->mv[i][0][1]      =
 846                             s->last_mv[i][0][1] =
 847                             s->last_mv[i][1][1] =
 848                                 mpeg_decode_motion(s, s->mpeg_f_code[i][1],
 849                                                    s->last_mv[i][0][1]);
 850                             /* full_pel: only for MPEG-1 */
 851                             if (s->full_pel[i]) {
 852                                 s->mv[i][0][0] *= 2;
 853                                 s->mv[i][0][1] *= 2;
 854                             }
 855                         }
 856                     }
 857                 } else {
 858                     mb_type   |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
 859                     s->mv_type = MV_TYPE_16X8;
 860                     for (i = 0; i < 2; i++) {
 861                         if (USES_LIST(mb_type, i)) {
 862                             /* MT_16X8 */
 863                             for (j = 0; j < 2; j++) {
 864                                 s->field_select[i][j] = get_bits1(&s->gb);
 865                                 for (k = 0; k < 2; k++) {
 866                                     val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
 867                                                              s->last_mv[i][j][k]);
 868                                     s->last_mv[i][j][k] = val;
 869                                     s->mv[i][j][k]      = val;
 870                                 }
 871                             }
 872                         }
 873                     }
 874                 }
 875                 break;
 876             case MT_FIELD:
 877                 s->mv_type = MV_TYPE_FIELD;
 878                 if (s->picture_structure == PICT_FRAME) {
 879                     mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
 880                     for (i = 0; i < 2; i++) {
 881                         if (USES_LIST(mb_type, i)) {
 882                             for (j = 0; j < 2; j++) {
 883                                 s->field_select[i][j] = get_bits1(&s->gb);
 884                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
 885                                                          s->last_mv[i][j][0]);
 886                                 s->last_mv[i][j][0] = val;
 887                                 s->mv[i][j][0]      = val;
 888                                 ff_tlog(s->avctx, "fmx=%d\n", val);
 889                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
 890                                                          s->last_mv[i][j][1] >> 1);
 891                                 s->last_mv[i][j][1] = 2 * val;
 892                                 s->mv[i][j][1]      = val;
 893                                 ff_tlog(s->avctx, "fmy=%d\n", val);
 894                             }
 895                         }
 896                     }
 897                 } else {
 898                     av_assert0(!s->progressive_sequence);
 899                     mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
 900                     for (i = 0; i < 2; i++) {
 901                         if (USES_LIST(mb_type, i)) {
 902                             s->field_select[i][0] = get_bits1(&s->gb);
 903                             for (k = 0; k < 2; k++) {
 904                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
 905                                                          s->last_mv[i][0][k]);
 906                                 s->last_mv[i][0][k] = val;
 907                                 s->last_mv[i][1][k] = val;
 908                                 s->mv[i][0][k]      = val;
 909                             }
 910                         }
 911                     }
 912                 }
 913                 break;
 914             case MT_DMV:
 915                 if (s->progressive_sequence){
 916                     av_log(s->avctx, AV_LOG_ERROR, "MT_DMV in progressive_sequence\n");
 917                     return AVERROR_INVALIDDATA;
 918                 }
 919                 s->mv_type = MV_TYPE_DMV;
 920                 for (i = 0; i < 2; i++) {
 921                     if (USES_LIST(mb_type, i)) {
 922                         int dmx, dmy, mx, my, m;
 923                         const int my_shift = s->picture_structure == PICT_FRAME;
 924
 925                         mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
 926                                                 s->last_mv[i][0][0]);
 927                         s->last_mv[i][0][0] = mx;
 928                         s->last_mv[i][1][0] = mx;
 929                         dmx = get_dmv(s);
 930                         my  = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
 931                                                  s->last_mv[i][0][1] >> my_shift);
 932                         dmy = get_dmv(s);
 933
 934
 935                         s->last_mv[i][0][1] = my * (1 << my_shift);
 936                         s->last_mv[i][1][1] = my * (1 << my_shift);
 937
 938                         s->mv[i][0][0] = mx;
 939                         s->mv[i][0][1] = my;
 940                         s->mv[i][1][0] = mx; // not used
 941                         s->mv[i][1][1] = my; // not used
 942
 943                         if (s->picture_structure == PICT_FRAME) {
 944                             mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
 945
 946                             // m = 1 + 2 * s->top_field_first;
 947                             m = s->top_field_first ? 1 : 3;
 948
 949                             /* top -> top pred */
 950                             s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
 951                             s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
 952                             m = 4 - m;
 953                             s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
 954                             s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
 955                         } else {
 956                             mb_type |= MB_TYPE_16x16;
 957
 958                             s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
 959                             s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
 960                             if (s->picture_structure == PICT_TOP_FIELD)
 961                                 s->mv[i][2][1]--;
 962                             else
 963                                 s->mv[i][2][1]++;
 964                         }
 965                     }
 966                 }
 967                 break;
 968             default:
 969                 av_log(s->avctx, AV_LOG_ERROR,
 970                        "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
 971                 return AVERROR_INVALIDDATA;
 972             }
 973         }
 974
 975         s->mb_intra = 0;
 976         if (HAS_CBP(mb_type)) {
 977             s->bdsp.clear_blocks(s->block[0]);
 978
 979             cbp = get_vlc2(&s->gb, ff_mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
 980             if (mb_block_count > 6) {
 981                 cbp *= 1 << mb_block_count - 6;
 982                 cbp  |= get_bits(&s->gb, mb_block_count - 6);
 983                 s->bdsp.clear_blocks(s->block[6]);
 984             }
 985             if (cbp <= 0) {
 986                 av_log(s->avctx, AV_LOG_ERROR,
 987                        "invalid cbp %d at %d %d\n", cbp, s->mb_x, s->mb_y);
 988                 return AVERROR_INVALIDDATA;
 989             }
 990
 991             // if 1, we memcpy blocks in xvmcvideo
 992             if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
 993                 ff_xvmc_pack_pblocks(s, cbp);
 994
 995             if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
 996                 if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
 997                     for (i = 0; i < 6; i++) {
 998                         if (cbp & 32)
 999                             mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
1000                         else
1001                             s->block_last_index[i] = -1;
1002                         cbp += cbp;
1003                     }
1004                 } else {
1005                     cbp <<= 12 - mb_block_count;
1006
1007                     for (i = 0; i < mb_block_count; i++) {
1008                         if (cbp & (1 << 11)) {
1009                             if ((ret = mpeg2_decode_block_non_intra(s, *s->pblocks[i], i)) < 0)
1010                                 return ret;
1011                         } else {
1012                             s->block_last_index[i] = -1;
1013                         }
1014                         cbp += cbp;
1015                     }
1016                 }
1017             } else {
1018                 if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
1019                     for (i = 0; i < 6; i++) {
1020                         if (cbp & 32)
1021                             mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1022                         else
1023                             s->block_last_index[i] = -1;
1024                         cbp += cbp;
1025                     }
1026                 } else {
1027                     for (i = 0; i < 6; i++) {
1028                         if (cbp & 32) {
1029                             if ((ret = mpeg1_decode_block_inter(s, *s->pblocks[i], i)) < 0)
1030                                 return ret;
1031                         } else {
1032                             s->block_last_index[i] = -1;
1033                         }
1034                         cbp += cbp;
1035                     }
1036                 }
1037             }
1038         } else {
1039             for (i = 0; i < 12; i++)
1040                 s->block_last_index[i] = -1;
1041         }
1042     }
1043
1044     s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1045
1046     return 0;
1047 }
1048
1049 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1050 {
1051     Mpeg1Context *s    = avctx->priv_data;
1052     MpegEncContext *s2 = &s->mpeg_enc_ctx;
1053
1054     if (   avctx->codec_tag != AV_RL32("VCR2")
1055         && avctx->codec_tag != AV_RL32("BW10"))
1056         avctx->coded_width = avctx->coded_height = 0; // do not trust dimensions from input
1057     ff_mpv_decode_init(s2, avctx);
1058
1059     /* we need some permutation to store matrices,
1060      * until the decoder sets the real permutation. */
1061     ff_mpv_idct_init(s2);
1062     ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1063     ff_mpeg12_init_vlcs();
1064
1065     s2->chroma_format              = 1;
1066     s->mpeg_enc_ctx_allocated      = 0;
1067     s->mpeg_enc_ctx.picture_number = 0;
1068     s->repeat_field                = 0;
1069     avctx->color_range             = AVCOL_RANGE_MPEG;
1070     return 0;
1071 }
1072
1073 #if HAVE_THREADS
1074 static int mpeg_decode_update_thread_context(AVCodecContext *avctx,
1075                                              const AVCodecContext *avctx_from)
1076 {
1077     Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1078     MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1079     int err;
1080
1081     if (avctx == avctx_from               ||
1082         !ctx_from->mpeg_enc_ctx_allocated ||
1083         !s1->context_initialized)
1084         return 0;
1085
1086     err = ff_mpeg_update_thread_context(avctx, avctx_from);
1087     if (err)
1088         return err;
1089
1090     if (!ctx->mpeg_enc_ctx_allocated)
1091         memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1092
1093     if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1094         s->picture_number++;
1095
1096     return 0;
1097 }
1098 #endif
1099
1100 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1101                                  const uint8_t *new_perm)
1102 {
1103     uint16_t temp_matrix[64];
1104     int i;
1105
1106     memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1107
1108     for (i = 0; i < 64; i++)
1109         matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1110 }
1111
1112 static const enum AVPixelFormat mpeg1_hwaccel_pixfmt_list_420[] = {
1113 #if CONFIG_MPEG1_NVDEC_HWACCEL
1114     AV_PIX_FMT_CUDA,
1115 #endif
1116 #if CONFIG_MPEG1_XVMC_HWACCEL
1117     AV_PIX_FMT_XVMC,
1118 #endif
1119 #if CONFIG_MPEG1_VDPAU_HWACCEL
1120     AV_PIX_FMT_VDPAU,
1121 #endif
1122     AV_PIX_FMT_YUV420P,
1123     AV_PIX_FMT_NONE
1124 };
1125
1126 static const enum AVPixelFormat mpeg2_hwaccel_pixfmt_list_420[] = {
1127 #if CONFIG_MPEG2_NVDEC_HWACCEL
1128     AV_PIX_FMT_CUDA,
1129 #endif
1130 #if CONFIG_MPEG2_XVMC_HWACCEL
1131     AV_PIX_FMT_XVMC,
1132 #endif
1133 #if CONFIG_MPEG2_VDPAU_HWACCEL
1134     AV_PIX_FMT_VDPAU,
1135 #endif
1136 #if CONFIG_MPEG2_DXVA2_HWACCEL
1137     AV_PIX_FMT_DXVA2_VLD,
1138 #endif
1139 #if CONFIG_MPEG2_D3D11VA_HWACCEL
1140     AV_PIX_FMT_D3D11VA_VLD,
1141     AV_PIX_FMT_D3D11,
1142 #endif
1143 #if CONFIG_MPEG2_VAAPI_HWACCEL
1144     AV_PIX_FMT_VAAPI,
1145 #endif
1146 #if CONFIG_MPEG2_VIDEOTOOLBOX_HWACCEL
1147     AV_PIX_FMT_VIDEOTOOLBOX,
1148 #endif
1149     AV_PIX_FMT_YUV420P,
1150     AV_PIX_FMT_NONE
1151 };
1152
1153 static const enum AVPixelFormat mpeg12_pixfmt_list_422[] = {
1154     AV_PIX_FMT_YUV422P,
1155     AV_PIX_FMT_NONE
1156 };
1157
1158 static const enum AVPixelFormat mpeg12_pixfmt_list_444[] = {
1159     AV_PIX_FMT_YUV444P,
1160     AV_PIX_FMT_NONE
1161 };
1162
1163 static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
1164 {
1165     Mpeg1Context *s1  = avctx->priv_data;
1166     MpegEncContext *s = &s1->mpeg_enc_ctx;
1167     const enum AVPixelFormat *pix_fmts;
1168
1169     if (CONFIG_GRAY && (avctx->flags & AV_CODEC_FLAG_GRAY))
1170         return AV_PIX_FMT_GRAY8;
1171
1172     if (s->chroma_format < 2)
1173         pix_fmts = avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO ?
1174                                 mpeg1_hwaccel_pixfmt_list_420 :
1175                                 mpeg2_hwaccel_pixfmt_list_420;
1176     else if (s->chroma_format == 2)
1177         pix_fmts = mpeg12_pixfmt_list_422;
1178     else
1179         pix_fmts = mpeg12_pixfmt_list_444;
1180
1181     return ff_thread_get_format(avctx, pix_fmts);
1182 }
1183
1184 static void setup_hwaccel_for_pixfmt(AVCodecContext *avctx)
1185 {
1186     // until then pix_fmt may be changed right after codec init
1187     if (avctx->hwaccel)
1188         if (avctx->idct_algo == FF_IDCT_AUTO)
1189             avctx->idct_algo = FF_IDCT_NONE;
1190
1191     if (avctx->hwaccel && avctx->pix_fmt == AV_PIX_FMT_XVMC) {
1192         Mpeg1Context *s1 = avctx->priv_data;
1193         MpegEncContext *s = &s1->mpeg_enc_ctx;
1194
1195         s->pack_pblocks = 1;
1196     }
1197 }
1198
1199 /* Call this function when we know all parameters.
1200  * It may be called in different places for MPEG-1 and MPEG-2. */
1201 static int mpeg_decode_postinit(AVCodecContext *avctx)
1202 {
1203     Mpeg1Context *s1  = avctx->priv_data;
1204     MpegEncContext *s = &s1->mpeg_enc_ctx;
1205     uint8_t old_permutation[64];
1206     int ret;
1207
1208     if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1209         // MPEG-1 aspect
1210         AVRational aspect_inv = av_d2q(ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1211         avctx->sample_aspect_ratio = (AVRational) { aspect_inv.den, aspect_inv.num };
1212     } else { // MPEG-2
1213         // MPEG-2 aspect
1214         if (s->aspect_ratio_info > 1) {
1215             AVRational dar =
1216                 av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1217                                   (AVRational) { s1->pan_scan.width,
1218                                                  s1->pan_scan.height }),
1219                          (AVRational) { s->width, s->height });
1220
1221             /* We ignore the spec here and guess a bit as reality does not
1222              * match the spec, see for example res_change_ffmpeg_aspect.ts
1223              * and sequence-display-aspect.mpg.
1224              * issue1613, 621, 562 */
1225             if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1226                 (av_cmp_q(dar, (AVRational) { 4, 3 }) &&
1227                  av_cmp_q(dar, (AVRational) { 16, 9 }))) {
1228                 s->avctx->sample_aspect_ratio =
1229                     av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1230                              (AVRational) { s->width, s->height });
1231             } else {
1232                 s->avctx->sample_aspect_ratio =
1233                     av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1234                              (AVRational) { s1->pan_scan.width, s1->pan_scan.height });
1235 // issue1613 4/3 16/9 -> 16/9
1236 // res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1237 // widescreen-issue562.mpg 4/3 16/9 -> 16/9
1238 //                s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1239                 ff_dlog(avctx, "aspect A %d/%d\n",
1240                         ff_mpeg2_aspect[s->aspect_ratio_info].num,
1241                         ff_mpeg2_aspect[s->aspect_ratio_info].den);
1242                 ff_dlog(avctx, "aspect B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1243                         s->avctx->sample_aspect_ratio.den);
1244             }
1245         } else {
1246             s->avctx->sample_aspect_ratio =
1247                 ff_mpeg2_aspect[s->aspect_ratio_info];
1248         }
1249     } // MPEG-2
1250
1251     if (av_image_check_sar(s->width, s->height,
1252                            avctx->sample_aspect_ratio) < 0) {
1253         av_log(avctx, AV_LOG_WARNING, "ignoring invalid SAR: %u/%u\n",
1254                 avctx->sample_aspect_ratio.num,
1255                 avctx->sample_aspect_ratio.den);
1256         avctx->sample_aspect_ratio = (AVRational){ 0, 1 };
1257     }
1258
1259     if ((s1->mpeg_enc_ctx_allocated == 0)                   ||
1260         avctx->coded_width       != s->width                ||
1261         avctx->coded_height      != s->height               ||
1262         s1->save_width           != s->width                ||
1263         s1->save_height          != s->height               ||
1264         av_cmp_q(s1->save_aspect, s->avctx->sample_aspect_ratio) ||
1265         (s1->save_progressive_seq != s->progressive_sequence && FFALIGN(s->height, 16) != FFALIGN(s->height, 32)) ||
1266         0) {
1267         if (s1->mpeg_enc_ctx_allocated) {
1268             ParseContext pc = s->parse_context;
1269             s->parse_context.buffer = 0;
1270             ff_mpv_common_end(s);
1271             s->parse_context = pc;
1272             s1->mpeg_enc_ctx_allocated = 0;
1273         }
1274
1275         ret = ff_set_dimensions(avctx, s->width, s->height);
1276         if (ret < 0)
1277             return ret;
1278
1279         if (avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->bit_rate) {
1280             avctx->rc_max_rate = s->bit_rate;
1281         } else if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && s->bit_rate &&
1282                    (s->bit_rate != 0x3FFFF*400 || s->vbv_delay != 0xFFFF)) {
1283             avctx->bit_rate = s->bit_rate;
1284         }
1285         s1->save_aspect          = s->avctx->sample_aspect_ratio;
1286         s1->save_width           = s->width;
1287         s1->save_height          = s->height;
1288         s1->save_progressive_seq = s->progressive_sequence;
1289
1290         /* low_delay may be forced, in this case we will have B-frames
1291          * that behave like P-frames. */
1292         avctx->has_b_frames = !s->low_delay;
1293
1294         if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1295             // MPEG-1 fps
1296             avctx->framerate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
1297             avctx->ticks_per_frame     = 1;
1298
1299             avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1300         } else { // MPEG-2
1301             // MPEG-2 fps
1302             av_reduce(&s->avctx->framerate.num,
1303                       &s->avctx->framerate.den,
1304                       ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
1305                       ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1306                       1 << 30);
1307             avctx->ticks_per_frame = 2;
1308
1309             switch (s->chroma_format) {
1310             case 1: avctx->chroma_sample_location = AVCHROMA_LOC_LEFT; break;
1311             case 2:
1312             case 3: avctx->chroma_sample_location = AVCHROMA_LOC_TOPLEFT; break;
1313             default: av_assert0(0);
1314             }
1315         } // MPEG-2
1316
1317         avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1318         setup_hwaccel_for_pixfmt(avctx);
1319
1320         /* Quantization matrices may need reordering
1321          * if DCT permutation is changed. */
1322         memcpy(old_permutation, s->idsp.idct_permutation, 64 * sizeof(uint8_t));
1323
1324         ff_mpv_idct_init(s);
1325         if ((ret = ff_mpv_common_init(s)) < 0)
1326             return ret;
1327
1328         quant_matrix_rebuild(s->intra_matrix,        old_permutation, s->idsp.idct_permutation);
1329         quant_matrix_rebuild(s->inter_matrix,        old_permutation, s->idsp.idct_permutation);
1330         quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->idsp.idct_permutation);
1331         quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->idsp.idct_permutation);
1332
1333         s1->mpeg_enc_ctx_allocated = 1;
1334     }
1335     return 0;
1336 }
1337
1338 static int mpeg1_decode_picture(AVCodecContext *avctx, const uint8_t *buf,
1339                                 int buf_size)
1340 {
1341     Mpeg1Context *s1  = avctx->priv_data;
1342     MpegEncContext *s = &s1->mpeg_enc_ctx;
1343     int ref, f_code, vbv_delay;
1344
1345     init_get_bits(&s->gb, buf, buf_size * 8);
1346
1347     ref = get_bits(&s->gb, 10); /* temporal ref */
1348     s->pict_type = get_bits(&s->gb, 3);
1349     if (s->pict_type == 0 || s->pict_type > 3)
1350         return AVERROR_INVALIDDATA;
1351
1352     vbv_delay = get_bits(&s->gb, 16);
1353     s->vbv_delay = vbv_delay;
1354     if (s->pict_type == AV_PICTURE_TYPE_P ||
1355         s->pict_type == AV_PICTURE_TYPE_B) {
1356         s->full_pel[0] = get_bits1(&s->gb);
1357         f_code = get_bits(&s->gb, 3);
1358         if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1359             return AVERROR_INVALIDDATA;
1360         f_code += !f_code;
1361         s->mpeg_f_code[0][0] = f_code;
1362         s->mpeg_f_code[0][1] = f_code;
1363     }
1364     if (s->pict_type == AV_PICTURE_TYPE_B) {
1365         s->full_pel[1] = get_bits1(&s->gb);
1366         f_code = get_bits(&s->gb, 3);
1367         if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1368             return AVERROR_INVALIDDATA;
1369         f_code += !f_code;
1370         s->mpeg_f_code[1][0] = f_code;
1371         s->mpeg_f_code[1][1] = f_code;
1372     }
1373     s->current_picture.f->pict_type = s->pict_type;
1374     s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1375
1376     if (avctx->debug & FF_DEBUG_PICT_INFO)
1377         av_log(avctx, AV_LOG_DEBUG,
1378                "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1379
1380     s->y_dc_scale = 8;
1381     s->c_dc_scale = 8;
1382     return 0;
1383 }
1384
1385 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1386 {
1387     MpegEncContext *s = &s1->mpeg_enc_ctx;
1388     int horiz_size_ext, vert_size_ext;
1389     int bit_rate_ext;
1390     AVCPBProperties *cpb_props;
1391
1392     skip_bits(&s->gb, 1); /* profile and level esc*/
1393     s->avctx->profile       = get_bits(&s->gb, 3);
1394     s->avctx->level         = get_bits(&s->gb, 4);
1395     s->progressive_sequence = get_bits1(&s->gb);   /* progressive_sequence */
1396     s->chroma_format        = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1397
1398     if (!s->chroma_format) {
1399         s->chroma_format = 1;
1400         av_log(s->avctx, AV_LOG_WARNING, "Chroma format invalid\n");
1401     }
1402
1403     horiz_size_ext          = get_bits(&s->gb, 2);
1404     vert_size_ext           = get_bits(&s->gb, 2);
1405     s->width  |= (horiz_size_ext << 12);
1406     s->height |= (vert_size_ext  << 12);
1407     bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1408     s->bit_rate += (bit_rate_ext << 18) * 400LL;
1409     check_marker(s->avctx, &s->gb, "after bit rate extension");
1410     s1->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1411
1412     s->low_delay = get_bits1(&s->gb);
1413     if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
1414         s->low_delay = 1;
1415
1416     s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1417     s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1418
1419     ff_dlog(s->avctx, "sequence extension\n");
1420     s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1421
1422     if (cpb_props = ff_add_cpb_side_data(s->avctx)) {
1423         cpb_props->buffer_size = s1->rc_buffer_size;
1424         if (s->bit_rate != 0x3FFFF*400)
1425             cpb_props->max_bitrate = s->bit_rate;
1426     }
1427
1428     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1429         av_log(s->avctx, AV_LOG_DEBUG,
1430                "profile: %d, level: %d ps: %d cf:%d vbv buffer: %d, bitrate:%"PRId64"\n",
1431                s->avctx->profile, s->avctx->level, s->progressive_sequence, s->chroma_format,
1432                s1->rc_buffer_size, s->bit_rate);
1433 }
1434
1435 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1436 {
1437     MpegEncContext *s = &s1->mpeg_enc_ctx;
1438     int color_description, w, h;
1439
1440     skip_bits(&s->gb, 3); /* video format */
1441     color_description = get_bits1(&s->gb);
1442     if (color_description) {
1443         s->avctx->color_primaries = get_bits(&s->gb, 8);
1444         s->avctx->color_trc       = get_bits(&s->gb, 8);
1445         s->avctx->colorspace      = get_bits(&s->gb, 8);
1446     }
1447     w = get_bits(&s->gb, 14);
1448     skip_bits(&s->gb, 1); // marker
1449     h = get_bits(&s->gb, 14);
1450     // remaining 3 bits are zero padding
1451
1452     s1->pan_scan.width  = 16 * w;
1453     s1->pan_scan.height = 16 * h;
1454
1455     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1456         av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1457 }
1458
1459 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1460 {
1461     MpegEncContext *s = &s1->mpeg_enc_ctx;
1462     int i, nofco;
1463
1464     nofco = 1;
1465     if (s->progressive_sequence) {
1466         if (s->repeat_first_field) {
1467             nofco++;
1468             if (s->top_field_first)
1469                 nofco++;
1470         }
1471     } else {
1472         if (s->picture_structure == PICT_FRAME) {
1473             nofco++;
1474             if (s->repeat_first_field)
1475                 nofco++;
1476         }
1477     }
1478     for (i = 0; i < nofco; i++) {
1479         s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1480         skip_bits(&s->gb, 1); // marker
1481         s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1482         skip_bits(&s->gb, 1); // marker
1483     }
1484
1485     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1486         av_log(s->avctx, AV_LOG_DEBUG,
1487                "pde (%"PRId16",%"PRId16") (%"PRId16",%"PRId16") (%"PRId16",%"PRId16")\n",
1488                s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1489                s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1490                s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1491 }
1492
1493 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64],
1494                        uint16_t matrix1[64], int intra)
1495 {
1496     int i;
1497
1498     for (i = 0; i < 64; i++) {
1499         int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1500         int v = get_bits(&s->gb, 8);
1501         if (v == 0) {
1502             av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1503             return AVERROR_INVALIDDATA;
1504         }
1505         if (intra && i == 0 && v != 8) {
1506             av_log(s->avctx, AV_LOG_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v);
1507             v = 8; // needed by pink.mpg / issue1046
1508         }
1509         matrix0[j] = v;
1510         if (matrix1)
1511             matrix1[j] = v;
1512     }
1513     return 0;
1514 }
1515
1516 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1517 {
1518     ff_dlog(s->avctx, "matrix extension\n");
1519
1520     if (get_bits1(&s->gb))
1521         load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1522     if (get_bits1(&s->gb))
1523         load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1524     if (get_bits1(&s->gb))
1525         load_matrix(s, s->chroma_intra_matrix, NULL, 1);
1526     if (get_bits1(&s->gb))
1527         load_matrix(s, s->chroma_inter_matrix, NULL, 0);
1528 }
1529
1530 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1531 {
1532     MpegEncContext *s = &s1->mpeg_enc_ctx;
1533
1534     s->full_pel[0]       = s->full_pel[1] = 0;
1535     s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1536     s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1537     s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1538     s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1539     if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1540         av_log(s->avctx, AV_LOG_ERROR,
1541                "Missing picture start code, guessing missing values\n");
1542         if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1543             if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1544                 s->pict_type = AV_PICTURE_TYPE_I;
1545             else
1546                 s->pict_type = AV_PICTURE_TYPE_P;
1547         } else
1548             s->pict_type = AV_PICTURE_TYPE_B;
1549         s->current_picture.f->pict_type = s->pict_type;
1550         s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1551     }
1552     s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0];
1553     s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1];
1554     s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0];
1555     s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1];
1556
1557     s->intra_dc_precision         = get_bits(&s->gb, 2);
1558     s->picture_structure          = get_bits(&s->gb, 2);
1559     s->top_field_first            = get_bits1(&s->gb);
1560     s->frame_pred_frame_dct       = get_bits1(&s->gb);
1561     s->concealment_motion_vectors = get_bits1(&s->gb);
1562     s->q_scale_type               = get_bits1(&s->gb);
1563     s->intra_vlc_format           = get_bits1(&s->gb);
1564     s->alternate_scan             = get_bits1(&s->gb);
1565     s->repeat_first_field         = get_bits1(&s->gb);
1566     s->chroma_420_type            = get_bits1(&s->gb);
1567     s->progressive_frame          = get_bits1(&s->gb);
1568
1569     if (s->alternate_scan) {
1570         ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1571         ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1572     } else {
1573         ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1574         ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1575     }
1576
1577     /* composite display not parsed */
1578     ff_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1579     ff_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1580     ff_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1581     ff_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1582     ff_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1583     ff_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1584     ff_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1585     ff_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1586     ff_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1587 }
1588
1589 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1590 {
1591     AVCodecContext *avctx = s->avctx;
1592     Mpeg1Context *s1      = (Mpeg1Context *) s;
1593     int ret;
1594
1595     if (!(avctx->flags2 & AV_CODEC_FLAG2_CHUNKS)) {
1596         if (s->mb_width * s->mb_height * 11LL / (33 * 2 * 8) > buf_size)
1597             return AVERROR_INVALIDDATA;
1598     }
1599
1600     /* start frame decoding */
1601     if (s->first_field || s->picture_structure == PICT_FRAME) {
1602         AVFrameSideData *pan_scan;
1603
1604         if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
1605             return ret;
1606
1607         ff_mpeg_er_frame_start(s);
1608
1609         /* first check if we must repeat the frame */
1610         s->current_picture_ptr->f->repeat_pict = 0;
1611         if (s->repeat_first_field) {
1612             if (s->progressive_sequence) {
1613                 if (s->top_field_first)
1614                     s->current_picture_ptr->f->repeat_pict = 4;
1615                 else
1616                     s->current_picture_ptr->f->repeat_pict = 2;
1617             } else if (s->progressive_frame) {
1618                 s->current_picture_ptr->f->repeat_pict = 1;
1619             }
1620         }
1621
1622         pan_scan = av_frame_new_side_data(s->current_picture_ptr->f,
1623                                           AV_FRAME_DATA_PANSCAN,
1624                                           sizeof(s1->pan_scan));
1625         if (!pan_scan)
1626             return AVERROR(ENOMEM);
1627         memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
1628
1629         if (s1->a53_buf_ref) {
1630             AVFrameSideData *sd = av_frame_new_side_data_from_buf(
1631                 s->current_picture_ptr->f, AV_FRAME_DATA_A53_CC,
1632                 s1->a53_buf_ref);
1633             if (!sd)
1634                 av_buffer_unref(&s1->a53_buf_ref);
1635             s1->a53_buf_ref = NULL;
1636         }
1637
1638         if (s1->has_stereo3d) {
1639             AVStereo3D *stereo = av_stereo3d_create_side_data(s->current_picture_ptr->f);
1640             if (!stereo)
1641                 return AVERROR(ENOMEM);
1642
1643             *stereo = s1->stereo3d;
1644             s1->has_stereo3d = 0;
1645         }
1646
1647         if (s1->has_afd) {
1648             AVFrameSideData *sd =
1649                 av_frame_new_side_data(s->current_picture_ptr->f,
1650                                        AV_FRAME_DATA_AFD, 1);
1651             if (!sd)
1652                 return AVERROR(ENOMEM);
1653
1654             *sd->data   = s1->afd;
1655             s1->has_afd = 0;
1656         }
1657
1658         if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1659             ff_thread_finish_setup(avctx);
1660     } else { // second field
1661         int i;
1662
1663         if (!s->current_picture_ptr) {
1664             av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1665             return AVERROR_INVALIDDATA;
1666         }
1667
1668         if (s->avctx->hwaccel) {
1669             if ((ret = s->avctx->hwaccel->end_frame(s->avctx)) < 0) {
1670                 av_log(avctx, AV_LOG_ERROR,
1671                        "hardware accelerator failed to decode first field\n");
1672                 return ret;
1673             }
1674         }
1675
1676         for (i = 0; i < 4; i++) {
1677             s->current_picture.f->data[i] = s->current_picture_ptr->f->data[i];
1678             if (s->picture_structure == PICT_BOTTOM_FIELD)
1679                 s->current_picture.f->data[i] +=
1680                     s->current_picture_ptr->f->linesize[i];
1681         }
1682     }
1683
1684     if (avctx->hwaccel) {
1685         if ((ret = avctx->hwaccel->start_frame(avctx, buf, buf_size)) < 0)
1686             return ret;
1687     }
1688
1689     return 0;
1690 }
1691
1692 #define DECODE_SLICE_ERROR -1
1693 #define DECODE_SLICE_OK     0
1694
1695 /**
1696  * Decode a slice.
1697  * MpegEncContext.mb_y must be set to the MB row from the startcode.
1698  * @return DECODE_SLICE_ERROR if the slice is damaged,
1699  *         DECODE_SLICE_OK if this slice is OK
1700  */
1701 static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1702                              const uint8_t **buf, int buf_size)
1703 {
1704     AVCodecContext *avctx = s->avctx;
1705     const int lowres      = s->avctx->lowres;
1706     const int field_pic   = s->picture_structure != PICT_FRAME;
1707     int ret;
1708
1709     s->resync_mb_x =
1710     s->resync_mb_y = -1;
1711
1712     av_assert0(mb_y < s->mb_height);
1713
1714     init_get_bits(&s->gb, *buf, buf_size * 8);
1715     if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1716         skip_bits(&s->gb, 3);
1717
1718     ff_mpeg1_clean_buffers(s);
1719     s->interlaced_dct = 0;
1720
1721     s->qscale = mpeg_get_qscale(s);
1722
1723     if (s->qscale == 0) {
1724         av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1725         return AVERROR_INVALIDDATA;
1726     }
1727
1728     /* extra slice info */
1729     if (skip_1stop_8data_bits(&s->gb) < 0)
1730         return AVERROR_INVALIDDATA;
1731
1732     s->mb_x = 0;
1733
1734     if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1735         skip_bits1(&s->gb);
1736     } else {
1737         while (get_bits_left(&s->gb) > 0) {
1738             int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1739                                 MBINCR_VLC_BITS, 2);
1740             if (code < 0) {
1741                 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1742                 return AVERROR_INVALIDDATA;
1743             }
1744             if (code >= 33) {
1745                 if (code == 33)
1746                     s->mb_x += 33;
1747                 /* otherwise, stuffing, nothing to do */
1748             } else {
1749                 s->mb_x += code;
1750                 break;
1751             }
1752         }
1753     }
1754
1755     if (s->mb_x >= (unsigned) s->mb_width) {
1756         av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1757         return AVERROR_INVALIDDATA;
1758     }
1759
1760     if (avctx->hwaccel && avctx->hwaccel->decode_slice) {
1761         const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1762         int start_code = -1;
1763         buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1764         if (buf_end < *buf + buf_size)
1765             buf_end -= 4;
1766         s->mb_y = mb_y;
1767         if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1768             return DECODE_SLICE_ERROR;
1769         *buf = buf_end;
1770         return DECODE_SLICE_OK;
1771     }
1772
1773     s->resync_mb_x = s->mb_x;
1774     s->resync_mb_y = s->mb_y = mb_y;
1775     s->mb_skip_run = 0;
1776     ff_init_block_index(s);
1777
1778     if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1779         if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1780             av_log(s->avctx, AV_LOG_DEBUG,
1781                    "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",
1782                    s->qscale,
1783                    s->mpeg_f_code[0][0], s->mpeg_f_code[0][1],
1784                    s->mpeg_f_code[1][0], s->mpeg_f_code[1][1],
1785                    s->pict_type  == AV_PICTURE_TYPE_I ? "I" :
1786                    (s->pict_type == AV_PICTURE_TYPE_P ? "P" :
1787                    (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
1788                    s->progressive_sequence ? "ps"  : "",
1789                    s->progressive_frame    ? "pf"  : "",
1790                    s->alternate_scan       ? "alt" : "",
1791                    s->top_field_first      ? "top" : "",
1792                    s->intra_dc_precision, s->picture_structure,
1793                    s->frame_pred_frame_dct, s->concealment_motion_vectors,
1794                    s->q_scale_type, s->intra_vlc_format,
1795                    s->repeat_first_field, s->chroma_420_type ? "420" : "");
1796         }
1797     }
1798
1799     for (;;) {
1800         // If 1, we memcpy blocks in xvmcvideo.
1801         if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1802             ff_xvmc_init_block(s); // set s->block
1803
1804         if ((ret = mpeg_decode_mb(s, s->block)) < 0)
1805             return ret;
1806
1807         // Note motion_val is normally NULL unless we want to extract the MVs.
1808         if (s->current_picture.motion_val[0] && !s->encoding) {
1809             const int wrap = s->b8_stride;
1810             int xy         = s->mb_x * 2 + s->mb_y * 2 * wrap;
1811             int b8_xy      = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1812             int motion_x, motion_y, dir, i;
1813
1814             for (i = 0; i < 2; i++) {
1815                 for (dir = 0; dir < 2; dir++) {
1816                     if (s->mb_intra ||
1817                         (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1818                         motion_x = motion_y = 0;
1819                     } else if (s->mv_type == MV_TYPE_16X16 ||
1820                                (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1821                         motion_x = s->mv[dir][0][0];
1822                         motion_y = s->mv[dir][0][1];
1823                     } else { /* if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8)) */
1824                         motion_x = s->mv[dir][i][0];
1825                         motion_y = s->mv[dir][i][1];
1826                     }
1827
1828                     s->current_picture.motion_val[dir][xy][0]     = motion_x;
1829                     s->current_picture.motion_val[dir][xy][1]     = motion_y;
1830                     s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1831                     s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1832                     s->current_picture.ref_index [dir][b8_xy]     =
1833                     s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1834                     av_assert2(s->field_select[dir][i] == 0 ||
1835                                s->field_select[dir][i] == 1);
1836                 }
1837                 xy    += wrap;
1838                 b8_xy += 2;
1839             }
1840         }
1841
1842         s->dest[0] += 16 >> lowres;
1843         s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1844         s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1845
1846         ff_mpv_reconstruct_mb(s, s->block);
1847
1848         if (++s->mb_x >= s->mb_width) {
1849             const int mb_size = 16 >> s->avctx->lowres;
1850             int left;
1851
1852             ff_mpeg_draw_horiz_band(s, mb_size * (s->mb_y >> field_pic), mb_size);
1853             ff_mpv_report_decode_progress(s);
1854
1855             s->mb_x  = 0;
1856             s->mb_y += 1 << field_pic;
1857
1858             if (s->mb_y >= s->mb_height) {
1859                 int left   = get_bits_left(&s->gb);
1860                 int is_d10 = s->chroma_format == 2 &&
1861                              s->pict_type == AV_PICTURE_TYPE_I &&
1862                              avctx->profile == 0 && avctx->level == 5 &&
1863                              s->intra_dc_precision == 2 &&
1864                              s->q_scale_type == 1 && s->alternate_scan == 0 &&
1865                              s->progressive_frame == 0
1866                              /* vbv_delay == 0xBBB || 0xE10 */;
1867
1868                 if (left >= 32 && !is_d10) {
1869                     GetBitContext gb = s->gb;
1870                     align_get_bits(&gb);
1871                     if (show_bits(&gb, 24) == 0x060E2B) {
1872                         av_log(avctx, AV_LOG_DEBUG, "Invalid MXF data found in video stream\n");
1873                         is_d10 = 1;
1874                     }
1875                     if (left > 32 && show_bits_long(&gb, 32) == 0x201) {
1876                         av_log(avctx, AV_LOG_DEBUG, "skipping m704 alpha (unsupported)\n");
1877                         goto eos;
1878                     }
1879                 }
1880
1881                 if (left < 0 ||
1882                     (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10) ||
1883                     ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
1884                     av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X at %d %d\n",
1885                            left, left>0 ? show_bits(&s->gb, FFMIN(left, 23)) : 0, s->mb_x, s->mb_y);
1886                     return AVERROR_INVALIDDATA;
1887                 } else
1888                     goto eos;
1889             }
1890             // There are some files out there which are missing the last slice
1891             // in cases where the slice is completely outside the visible
1892             // area, we detect this here instead of running into the end expecting
1893             // more data
1894             left = get_bits_left(&s->gb);
1895             if (s->mb_y >= ((s->height + 15) >> 4) &&
1896                 !s->progressive_sequence &&
1897                 left <= 25 &&
1898                 left >= 0 &&
1899                 s->mb_skip_run == -1 &&
1900                 (!left || show_bits(&s->gb, left) == 0))
1901                 goto eos;
1902
1903             ff_init_block_index(s);
1904         }
1905
1906         /* skip mb handling */
1907         if (s->mb_skip_run == -1) {
1908             /* read increment again */
1909             s->mb_skip_run = 0;
1910             for (;;) {
1911                 int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1912                                     MBINCR_VLC_BITS, 2);
1913                 if (code < 0) {
1914                     av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1915                     return AVERROR_INVALIDDATA;
1916                 }
1917                 if (code >= 33) {
1918                     if (code == 33) {
1919                         s->mb_skip_run += 33;
1920                     } else if (code == 35) {
1921                         if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1922                             av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1923                             return AVERROR_INVALIDDATA;
1924                         }
1925                         goto eos; /* end of slice */
1926                     }
1927                     /* otherwise, stuffing, nothing to do */
1928                 } else {
1929                     s->mb_skip_run += code;
1930                     break;
1931                 }
1932             }
1933             if (s->mb_skip_run) {
1934                 int i;
1935                 if (s->pict_type == AV_PICTURE_TYPE_I) {
1936                     av_log(s->avctx, AV_LOG_ERROR,
1937                            "skipped MB in I-frame at %d %d\n", s->mb_x, s->mb_y);
1938                     return AVERROR_INVALIDDATA;
1939                 }
1940
1941                 /* skip mb */
1942                 s->mb_intra = 0;
1943                 for (i = 0; i < 12; i++)
1944                     s->block_last_index[i] = -1;
1945                 if (s->picture_structure == PICT_FRAME)
1946                     s->mv_type = MV_TYPE_16X16;
1947                 else
1948                     s->mv_type = MV_TYPE_FIELD;
1949                 if (s->pict_type == AV_PICTURE_TYPE_P) {
1950                     /* if P type, zero motion vector is implied */
1951                     s->mv_dir             = MV_DIR_FORWARD;
1952                     s->mv[0][0][0]        = s->mv[0][0][1]      = 0;
1953                     s->last_mv[0][0][0]   = s->last_mv[0][0][1] = 0;
1954                     s->last_mv[0][1][0]   = s->last_mv[0][1][1] = 0;
1955                     s->field_select[0][0] = (s->picture_structure - 1) & 1;
1956                 } else {
1957                     /* if B type, reuse previous vectors and directions */
1958                     s->mv[0][0][0] = s->last_mv[0][0][0];
1959                     s->mv[0][0][1] = s->last_mv[0][0][1];
1960                     s->mv[1][0][0] = s->last_mv[1][0][0];
1961                     s->mv[1][0][1] = s->last_mv[1][0][1];
1962                     s->field_select[0][0] = (s->picture_structure - 1) & 1;
1963                     s->field_select[1][0] = (s->picture_structure - 1) & 1;
1964                 }
1965             }
1966         }
1967     }
1968 eos: // end of slice
1969     if (get_bits_left(&s->gb) < 0) {
1970         av_log(s, AV_LOG_ERROR, "overread %d\n", -get_bits_left(&s->gb));
1971         return AVERROR_INVALIDDATA;
1972     }
1973     *buf += (get_bits_count(&s->gb) - 1) / 8;
1974     ff_dlog(s, "Slice start:%d %d  end:%d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1975     return 0;
1976 }
1977
1978 static int slice_decode_thread(AVCodecContext *c, void *arg)
1979 {
1980     MpegEncContext *s   = *(void **) arg;
1981     const uint8_t *buf  = s->gb.buffer;
1982     int mb_y            = s->start_mb_y;
1983     const int field_pic = s->picture_structure != PICT_FRAME;
1984
1985     s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
1986
1987     for (;;) {
1988         uint32_t start_code;
1989         int ret;
1990
1991         ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
1992         emms_c();
1993         ff_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1994                 ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
1995                 s->start_mb_y, s->end_mb_y, s->er.error_count);
1996         if (ret < 0) {
1997             if (c->err_recognition & AV_EF_EXPLODE)
1998                 return ret;
1999             if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
2000                 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2001                                 s->mb_x, s->mb_y,
2002                                 ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2003         } else {
2004             ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2005                             s->mb_x - 1, s->mb_y,
2006                             ER_AC_END | ER_DC_END | ER_MV_END);
2007         }
2008
2009         if (s->mb_y == s->end_mb_y)
2010             return 0;
2011
2012         start_code = -1;
2013         buf        = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
2014         if (start_code < SLICE_MIN_START_CODE || start_code > SLICE_MAX_START_CODE)
2015             return AVERROR_INVALIDDATA;
2016         mb_y       = start_code - SLICE_MIN_START_CODE;
2017         if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
2018             mb_y += (*buf&0xE0)<<2;
2019         mb_y <<= field_pic;
2020         if (s->picture_structure == PICT_BOTTOM_FIELD)
2021             mb_y++;
2022         if (mb_y >= s->end_mb_y)
2023             return AVERROR_INVALIDDATA;
2024     }
2025 }
2026
2027 /**
2028  * Handle slice ends.
2029  * @return 1 if it seems to be the last slice
2030  */
2031 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2032 {
2033     Mpeg1Context *s1  = avctx->priv_data;
2034     MpegEncContext *s = &s1->mpeg_enc_ctx;
2035
2036     if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2037         return 0;
2038
2039     if (s->avctx->hwaccel) {
2040         int ret = s->avctx->hwaccel->end_frame(s->avctx);
2041         if (ret < 0) {
2042             av_log(avctx, AV_LOG_ERROR,
2043                    "hardware accelerator failed to decode picture\n");
2044             return ret;
2045         }
2046     }
2047
2048     /* end of slice reached */
2049     if (/* s->mb_y << field_pic == s->mb_height && */ !s->first_field && !s1->first_slice) {
2050         /* end of image */
2051
2052         ff_er_frame_end(&s->er);
2053
2054         ff_mpv_frame_end(s);
2055
2056         if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
2057             int ret = av_frame_ref(pict, s->current_picture_ptr->f);
2058             if (ret < 0)
2059                 return ret;
2060             ff_print_debug_info(s, s->current_picture_ptr, pict);
2061             ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2062         } else {
2063             if (avctx->active_thread_type & FF_THREAD_FRAME)
2064                 s->picture_number++;
2065             /* latency of 1 frame for I- and P-frames */
2066             /* XXX: use another variable than picture_number */
2067             if (s->last_picture_ptr) {
2068                 int ret = av_frame_ref(pict, s->last_picture_ptr->f);
2069                 if (ret < 0)
2070                     return ret;
2071                 ff_print_debug_info(s, s->last_picture_ptr, pict);
2072                 ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2073             }
2074         }
2075
2076         return 1;
2077     } else {
2078         return 0;
2079     }
2080 }
2081
2082 static int mpeg1_decode_sequence(AVCodecContext *avctx,
2083                                  const uint8_t *buf, int buf_size)
2084 {
2085     Mpeg1Context *s1  = avctx->priv_data;
2086     MpegEncContext *s = &s1->mpeg_enc_ctx;
2087     int width, height;
2088     int i, v, j;
2089
2090     init_get_bits(&s->gb, buf, buf_size * 8);
2091
2092     width  = get_bits(&s->gb, 12);
2093     height = get_bits(&s->gb, 12);
2094     if (width == 0 || height == 0) {
2095         av_log(avctx, AV_LOG_WARNING,
2096                "Invalid horizontal or vertical size value.\n");
2097         if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2098             return AVERROR_INVALIDDATA;
2099     }
2100     s->aspect_ratio_info = get_bits(&s->gb, 4);
2101     if (s->aspect_ratio_info == 0) {
2102         av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2103         if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2104             return AVERROR_INVALIDDATA;
2105     }
2106     s->frame_rate_index = get_bits(&s->gb, 4);
2107     if (s->frame_rate_index == 0 || s->frame_rate_index > 13) {
2108         av_log(avctx, AV_LOG_WARNING,
2109                "frame_rate_index %d is invalid\n", s->frame_rate_index);
2110         s->frame_rate_index = 1;
2111     }
2112     s->bit_rate = get_bits(&s->gb, 18) * 400LL;
2113     if (check_marker(s->avctx, &s->gb, "in sequence header") == 0) {
2114         return AVERROR_INVALIDDATA;
2115     }
2116
2117     s1->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2118     skip_bits(&s->gb, 1);
2119
2120     /* get matrix */
2121     if (get_bits1(&s->gb)) {
2122         load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2123     } else {
2124         for (i = 0; i < 64; i++) {
2125             j = s->idsp.idct_permutation[i];
2126             v = ff_mpeg1_default_intra_matrix[i];
2127             s->intra_matrix[j]        = v;
2128             s->chroma_intra_matrix[j] = v;
2129         }
2130     }
2131     if (get_bits1(&s->gb)) {
2132         load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2133     } else {
2134         for (i = 0; i < 64; i++) {
2135             int j = s->idsp.idct_permutation[i];
2136             v = ff_mpeg1_default_non_intra_matrix[i];
2137             s->inter_matrix[j]        = v;
2138             s->chroma_inter_matrix[j] = v;
2139         }
2140     }
2141
2142     if (show_bits(&s->gb, 23) != 0) {
2143         av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2144         return AVERROR_INVALIDDATA;
2145     }
2146
2147     s->width  = width;
2148     s->height = height;
2149
2150     /* We set MPEG-2 parameters so that it emulates MPEG-1. */
2151     s->progressive_sequence = 1;
2152     s->progressive_frame    = 1;
2153     s->picture_structure    = PICT_FRAME;
2154     s->first_field          = 0;
2155     s->frame_pred_frame_dct = 1;
2156     s->chroma_format        = 1;
2157     s->codec_id             =
2158     s->avctx->codec_id      = AV_CODEC_ID_MPEG1VIDEO;
2159     s->out_format           = FMT_MPEG1;
2160     s->swap_uv              = 0; // AFAIK VCR2 does not have SEQ_HEADER
2161     if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
2162         s->low_delay = 1;
2163
2164     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2165         av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%"PRId64", aspect_ratio_info: %d \n",
2166                s1->rc_buffer_size, s->bit_rate, s->aspect_ratio_info);
2167
2168     return 0;
2169 }
2170
2171 static int vcr2_init_sequence(AVCodecContext *avctx)
2172 {
2173     Mpeg1Context *s1  = avctx->priv_data;
2174     MpegEncContext *s = &s1->mpeg_enc_ctx;
2175     int i, v, ret;
2176
2177     /* start new MPEG-1 context decoding */
2178     s->out_format = FMT_MPEG1;
2179     if (s1->mpeg_enc_ctx_allocated) {
2180         ff_mpv_common_end(s);
2181         s1->mpeg_enc_ctx_allocated = 0;
2182     }
2183     s->width            = avctx->coded_width;
2184     s->height           = avctx->coded_height;
2185     avctx->has_b_frames = 0; // true?
2186     s->low_delay        = 1;
2187
2188     avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2189     setup_hwaccel_for_pixfmt(avctx);
2190
2191     ff_mpv_idct_init(s);
2192     if ((ret = ff_mpv_common_init(s)) < 0)
2193         return ret;
2194     s1->mpeg_enc_ctx_allocated = 1;
2195
2196     for (i = 0; i < 64; i++) {
2197         int j = s->idsp.idct_permutation[i];
2198         v = ff_mpeg1_default_intra_matrix[i];
2199         s->intra_matrix[j]        = v;
2200         s->chroma_intra_matrix[j] = v;
2201
2202         v = ff_mpeg1_default_non_intra_matrix[i];
2203         s->inter_matrix[j]        = v;
2204         s->chroma_inter_matrix[j] = v;
2205     }
2206
2207     s->progressive_sequence  = 1;
2208     s->progressive_frame     = 1;
2209     s->picture_structure     = PICT_FRAME;
2210     s->first_field           = 0;
2211     s->frame_pred_frame_dct  = 1;
2212     s->chroma_format         = 1;
2213     if (s->codec_tag == AV_RL32("BW10")) {
2214         s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2215     } else {
2216         s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
2217         s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
2218     }
2219     s1->save_width           = s->width;
2220     s1->save_height          = s->height;
2221     s1->save_progressive_seq = s->progressive_sequence;
2222     return 0;
2223 }
2224
2225 static int mpeg_decode_a53_cc(AVCodecContext *avctx,
2226                               const uint8_t *p, int buf_size)
2227 {
2228     Mpeg1Context *s1 = avctx->priv_data;
2229
2230     if (buf_size >= 6 &&
2231         p[0] == 'G' && p[1] == 'A' && p[2] == '9' && p[3] == '4' &&
2232         p[4] == 3 && (p[5] & 0x40)) {
2233         /* extract A53 Part 4 CC data */
2234         int cc_count = p[5] & 0x1f;
2235         if (cc_count > 0 && buf_size >= 7 + cc_count * 3) {
2236             int old_size = s1->a53_buf_ref ? s1->a53_buf_ref->size : 0;
2237             const uint64_t new_size = (old_size + cc_count
2238                                             * UINT64_C(3));
2239             int ret;
2240
2241             if (new_size > 3*A53_MAX_CC_COUNT)
2242                 return AVERROR(EINVAL);
2243
2244             ret = av_buffer_realloc(&s1->a53_buf_ref, new_size);
2245             if (ret >= 0)
2246                 memcpy(s1->a53_buf_ref->data + old_size, p + 7, cc_count * UINT64_C(3));
2247
2248             avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
2249         }
2250         return 1;
2251     } else if (buf_size >= 2 &&
2252                p[0] == 0x03 && (p[1]&0x7f) == 0x01) {
2253         /* extract SCTE-20 CC data */
2254         GetBitContext gb;
2255         int cc_count = 0;
2256         int i, ret;
2257
2258         init_get_bits(&gb, p + 2, buf_size - 2);
2259         cc_count = get_bits(&gb, 5);
2260         if (cc_count > 0) {
2261             int old_size = s1->a53_buf_ref ? s1->a53_buf_ref->size : 0;
2262             const uint64_t new_size = (old_size + cc_count
2263                                             * UINT64_C(3));
2264             if (new_size > 3*A53_MAX_CC_COUNT)
2265                 return AVERROR(EINVAL);
2266
2267             ret = av_buffer_realloc(&s1->a53_buf_ref, new_size);
2268             if (ret >= 0) {
2269                 uint8_t field, cc1, cc2;
2270                 uint8_t *cap = s1->a53_buf_ref->data;
2271
2272                 memset(s1->a53_buf_ref->data + old_size, 0, cc_count * 3);
2273                 for (i = 0; i < cc_count && get_bits_left(&gb) >= 26; i++) {
2274                     skip_bits(&gb, 2); // priority
2275                     field = get_bits(&gb, 2);
2276                     skip_bits(&gb, 5); // line_offset
2277                     cc1 = get_bits(&gb, 8);
2278                     cc2 = get_bits(&gb, 8);
2279                     skip_bits(&gb, 1); // marker
2280
2281                     if (!field) { // forbidden
2282                         cap[0] = cap[1] = cap[2] = 0x00;
2283                     } else {
2284                         field = (field == 2 ? 1 : 0);
2285                         if (!s1->mpeg_enc_ctx.top_field_first) field = !field;
2286                         cap[0] = 0x04 | field;
2287                         cap[1] = ff_reverse[cc1];
2288                         cap[2] = ff_reverse[cc2];
2289                     }
2290                     cap += 3;
2291                 }
2292             }
2293             avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
2294         }
2295         return 1;
2296     } else if (buf_size >= 11 &&
2297                p[0] == 'C' && p[1] == 'C' && p[2] == 0x01 && p[3] == 0xf8) {
2298         /* extract DVD CC data
2299          *
2300          * uint32_t   user_data_start_code        0x000001B2    (big endian)
2301          * uint16_t   user_identifier             0x4343 "CC"
2302          * uint8_t    user_data_type_code         0x01
2303          * uint8_t    caption_block_size          0xF8
2304          * uint8_t
2305          *   bit 7    caption_odd_field_first     1=odd field (CC1/CC2) first  0=even field (CC3/CC4) first
2306          *   bit 6    caption_filler              0
2307          *   bit 5:1  caption_block_count         number of caption blocks (pairs of caption words = frames). Most DVDs use 15 per start of GOP.
2308          *   bit 0    caption_extra_field_added   1=one additional caption word
2309          *
2310          * struct caption_field_block {
2311          *   uint8_t
2312          *     bit 7:1 caption_filler             0x7F (all 1s)
2313          *     bit 0   caption_field_odd          1=odd field (this is CC1/CC2)  0=even field (this is CC3/CC4)
2314          *   uint8_t   caption_first_byte
2315          *   uint8_t   caption_second_byte
2316          * } caption_block[(caption_block_count * 2) + caption_extra_field_added];
2317          *
2318          * Some DVDs encode caption data for both fields with caption_field_odd=1. The only way to decode the fields
2319          * correctly is to start on the field indicated by caption_odd_field_first and count between odd/even fields.
2320          * Don't assume that the first caption word is the odd field. There do exist MPEG files in the wild that start
2321          * on the even field. There also exist DVDs in the wild that encode an odd field count and the
2322          * caption_extra_field_added/caption_odd_field_first bits change per packet to allow that. */
2323         int cc_count = 0;
2324         int i, ret;
2325         // There is a caption count field in the data, but it is often
2326         // incorrect.  So count the number of captions present.
2327         for (i = 5; i + 6 <= buf_size && ((p[i] & 0xfe) == 0xfe); i += 6)
2328             cc_count++;
2329         // Transform the DVD format into A53 Part 4 format
2330         if (cc_count > 0) {
2331             int old_size = s1->a53_buf_ref ? s1->a53_buf_ref->size : 0;
2332             const uint64_t new_size = (old_size + cc_count
2333                                             * UINT64_C(6));
2334             if (new_size > 3*A53_MAX_CC_COUNT)
2335                 return AVERROR(EINVAL);
2336
2337             ret = av_buffer_realloc(&s1->a53_buf_ref, new_size);
2338             if (ret >= 0) {
2339                 uint8_t field1 = !!(p[4] & 0x80);
2340                 uint8_t *cap = s1->a53_buf_ref->data;
2341                 p += 5;
2342                 for (i = 0; i < cc_count; i++) {
2343                     cap[0] = (p[0] == 0xff && field1) ? 0xfc : 0xfd;
2344                     cap[1] = p[1];
2345                     cap[2] = p[2];
2346                     cap[3] = (p[3] == 0xff && !field1) ? 0xfc : 0xfd;
2347                     cap[4] = p[4];
2348                     cap[5] = p[5];
2349                     cap += 6;
2350                     p += 6;
2351                 }
2352             }
2353             avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
2354         }
2355         return 1;
2356     }
2357     return 0;
2358 }
2359
2360 static void mpeg_decode_user_data(AVCodecContext *avctx,
2361                                   const uint8_t *p, int buf_size)
2362 {
2363     Mpeg1Context *s = avctx->priv_data;
2364     const uint8_t *buf_end = p + buf_size;
2365     Mpeg1Context *s1 = avctx->priv_data;
2366
2367 #if 0
2368     int i;
2369     for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i<buf_size; i++){
2370         av_log(avctx, AV_LOG_ERROR, "%c", p[i]);
2371     }
2372     av_log(avctx, AV_LOG_ERROR, "\n");
2373 #endif
2374
2375     if (buf_size > 29){
2376         int i;
2377         for(i=0; i<20; i++)
2378             if (!memcmp(p+i, "\0TMPGEXS\0", 9)){
2379                 s->tmpgexs= 1;
2380             }
2381     }
2382     /* we parse the DTG active format information */
2383     if (buf_end - p >= 5 &&
2384         p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2385         int flags = p[4];
2386         p += 5;
2387         if (flags & 0x80) {
2388             /* skip event id */
2389             p += 2;
2390         }
2391         if (flags & 0x40) {
2392             if (buf_end - p < 1)
2393                 return;
2394             s1->has_afd = 1;
2395             s1->afd     = p[0] & 0x0f;
2396         }
2397     } else if (buf_end - p >= 6 &&
2398                p[0] == 'J' && p[1] == 'P' && p[2] == '3' && p[3] == 'D' &&
2399                p[4] == 0x03) { // S3D_video_format_length
2400         // the 0x7F mask ignores the reserved_bit value
2401         const uint8_t S3D_video_format_type = p[5] & 0x7F;
2402
2403         if (S3D_video_format_type == 0x03 ||
2404             S3D_video_format_type == 0x04 ||
2405             S3D_video_format_type == 0x08 ||
2406             S3D_video_format_type == 0x23) {
2407
2408             s1->has_stereo3d = 1;
2409
2410             switch (S3D_video_format_type) {
2411             case 0x03:
2412                 s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE;
2413                 break;
2414             case 0x04:
2415                 s1->stereo3d.type = AV_STEREO3D_TOPBOTTOM;
2416                 break;
2417             case 0x08:
2418                 s1->stereo3d.type = AV_STEREO3D_2D;
2419                 break;
2420             case 0x23:
2421                 s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE_QUINCUNX;
2422                 break;
2423             }
2424         }
2425     } else if (mpeg_decode_a53_cc(avctx, p, buf_size)) {
2426         return;
2427     }
2428 }
2429
2430 static void mpeg_decode_gop(AVCodecContext *avctx,
2431                             const uint8_t *buf, int buf_size)
2432 {
2433     Mpeg1Context *s1  = avctx->priv_data;
2434     MpegEncContext *s = &s1->mpeg_enc_ctx;
2435     int broken_link;
2436     int64_t tc;
2437
2438     init_get_bits(&s->gb, buf, buf_size * 8);
2439
2440     tc = s-> timecode_frame_start = get_bits(&s->gb, 25);
2441
2442     s->closed_gop = get_bits1(&s->gb);
2443     /* broken_link indicates that after editing the
2444      * reference frames of the first B-Frames after GOP I-Frame
2445      * are missing (open gop) */
2446     broken_link = get_bits1(&s->gb);
2447
2448     if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2449         char tcbuf[AV_TIMECODE_STR_SIZE];
2450         av_timecode_make_mpeg_tc_string(tcbuf, tc);
2451         av_log(s->avctx, AV_LOG_DEBUG,
2452                "GOP (%s) closed_gop=%d broken_link=%d\n",
2453                tcbuf, s->closed_gop, broken_link);
2454     }
2455 }
2456
2457 static int decode_chunks(AVCodecContext *avctx, AVFrame *picture,
2458                          int *got_output, const uint8_t *buf, int buf_size)
2459 {
2460     Mpeg1Context *s = avctx->priv_data;
2461     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2462     const uint8_t *buf_ptr = buf;
2463     const uint8_t *buf_end = buf + buf_size;
2464     int ret, input_size;
2465     int last_code = 0, skip_frame = 0;
2466     int picture_start_code_seen = 0;
2467
2468     for (;;) {
2469         /* find next start code */
2470         uint32_t start_code = -1;
2471         buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
2472         if (start_code > 0x1ff) {
2473             if (!skip_frame) {
2474                 if (HAVE_THREADS &&
2475                     (avctx->active_thread_type & FF_THREAD_SLICE) &&
2476                     !avctx->hwaccel) {
2477                     int i;
2478                     av_assert0(avctx->thread_count > 1);
2479
2480                     avctx->execute(avctx, slice_decode_thread,
2481                                    &s2->thread_context[0], NULL,
2482                                    s->slice_count, sizeof(void *));
2483                     for (i = 0; i < s->slice_count; i++)
2484                         s2->er.error_count += s2->thread_context[i]->er.error_count;
2485                 }
2486
2487                 ret = slice_end(avctx, picture);
2488                 if (ret < 0)
2489                     return ret;
2490                 else if (ret) {
2491                     // FIXME: merge with the stuff in mpeg_decode_slice
2492                     if (s2->last_picture_ptr || s2->low_delay || s2->pict_type == AV_PICTURE_TYPE_B)
2493                         *got_output = 1;
2494                 }
2495             }
2496             s2->pict_type = 0;
2497
2498             if (avctx->err_recognition & AV_EF_EXPLODE && s2->er.error_count)
2499                 return AVERROR_INVALIDDATA;
2500
2501             return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2502         }
2503
2504         input_size = buf_end - buf_ptr;
2505
2506         if (avctx->debug & FF_DEBUG_STARTCODE)
2507             av_log(avctx, AV_LOG_DEBUG, "%3"PRIX32" at %"PTRDIFF_SPECIFIER" left %d\n",
2508                    start_code, buf_ptr - buf, input_size);
2509
2510         /* prepare data for next start code */
2511         switch (start_code) {
2512         case SEQ_START_CODE:
2513             if (last_code == 0) {
2514                 mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2515                 if (buf != avctx->extradata)
2516                     s->sync = 1;
2517             } else {
2518                 av_log(avctx, AV_LOG_ERROR,
2519                        "ignoring SEQ_START_CODE after %X\n", last_code);
2520                 if (avctx->err_recognition & AV_EF_EXPLODE)
2521                     return AVERROR_INVALIDDATA;
2522             }
2523             break;
2524
2525         case PICTURE_START_CODE:
2526             if (picture_start_code_seen && s2->picture_structure == PICT_FRAME) {
2527                /* If it's a frame picture, there can't be more than one picture header.
2528                   Yet, it does happen and we need to handle it. */
2529                av_log(avctx, AV_LOG_WARNING, "ignoring extra picture following a frame-picture\n");
2530                break;
2531             }
2532             picture_start_code_seen = 1;
2533
2534             if (s2->width <= 0 || s2->height <= 0) {
2535                 av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
2536                        s2->width, s2->height);
2537                 return AVERROR_INVALIDDATA;
2538             }
2539
2540             if (s->tmpgexs){
2541                 s2->intra_dc_precision= 3;
2542                 s2->intra_matrix[0]= 1;
2543             }
2544             if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
2545                 !avctx->hwaccel && s->slice_count) {
2546                 int i;
2547
2548                 avctx->execute(avctx, slice_decode_thread,
2549                                s2->thread_context, NULL,
2550                                s->slice_count, sizeof(void *));
2551                 for (i = 0; i < s->slice_count; i++)
2552                     s2->er.error_count += s2->thread_context[i]->er.error_count;
2553                 s->slice_count = 0;
2554             }
2555             if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2556                 ret = mpeg_decode_postinit(avctx);
2557                 if (ret < 0) {
2558                     av_log(avctx, AV_LOG_ERROR,
2559                            "mpeg_decode_postinit() failure\n");
2560                     return ret;
2561                 }
2562
2563                 /* We have a complete image: we try to decompress it. */
2564                 if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2565                     s2->pict_type = 0;
2566                 s->first_slice = 1;
2567                 last_code      = PICTURE_START_CODE;
2568             } else {
2569                 av_log(avctx, AV_LOG_ERROR,
2570                        "ignoring pic after %X\n", last_code);
2571                 if (avctx->err_recognition & AV_EF_EXPLODE)
2572                     return AVERROR_INVALIDDATA;
2573             }
2574             break;
2575         case EXT_START_CODE:
2576             init_get_bits(&s2->gb, buf_ptr, input_size * 8);
2577
2578             switch (get_bits(&s2->gb, 4)) {
2579             case 0x1:
2580                 if (last_code == 0) {
2581                     mpeg_decode_sequence_extension(s);
2582                 } else {
2583                     av_log(avctx, AV_LOG_ERROR,
2584                            "ignoring seq ext after %X\n", last_code);
2585                     if (avctx->err_recognition & AV_EF_EXPLODE)
2586                         return AVERROR_INVALIDDATA;
2587                 }
2588                 break;
2589             case 0x2:
2590                 mpeg_decode_sequence_display_extension(s);
2591                 break;
2592             case 0x3:
2593                 mpeg_decode_quant_matrix_extension(s2);
2594                 break;
2595             case 0x7:
2596                 mpeg_decode_picture_display_extension(s);
2597                 break;
2598             case 0x8:
2599                 if (last_code == PICTURE_START_CODE) {
2600                     mpeg_decode_picture_coding_extension(s);
2601                 } else {
2602                     av_log(avctx, AV_LOG_ERROR,
2603                            "ignoring pic cod ext after %X\n", last_code);
2604                     if (avctx->err_recognition & AV_EF_EXPLODE)
2605                         return AVERROR_INVALIDDATA;
2606                 }
2607                 break;
2608             }
2609             break;
2610         case USER_START_CODE:
2611             mpeg_decode_user_data(avctx, buf_ptr, input_size);
2612             break;
2613         case GOP_START_CODE:
2614             if (last_code == 0) {
2615                 s2->first_field = 0;
2616                 mpeg_decode_gop(avctx, buf_ptr, input_size);
2617                 s->sync = 1;
2618             } else {
2619                 av_log(avctx, AV_LOG_ERROR,
2620                        "ignoring GOP_START_CODE after %X\n", last_code);
2621                 if (avctx->err_recognition & AV_EF_EXPLODE)
2622                     return AVERROR_INVALIDDATA;
2623             }
2624             break;
2625         default:
2626             if (start_code >= SLICE_MIN_START_CODE &&
2627                 start_code <= SLICE_MAX_START_CODE && last_code == PICTURE_START_CODE) {
2628                 if (s2->progressive_sequence && !s2->progressive_frame) {
2629                     s2->progressive_frame = 1;
2630                     av_log(s2->avctx, AV_LOG_ERROR,
2631                            "interlaced frame in progressive sequence, ignoring\n");
2632                 }
2633
2634                 if (s2->picture_structure == 0 ||
2635                     (s2->progressive_frame && s2->picture_structure != PICT_FRAME)) {
2636                     av_log(s2->avctx, AV_LOG_ERROR,
2637                            "picture_structure %d invalid, ignoring\n",
2638                            s2->picture_structure);
2639                     s2->picture_structure = PICT_FRAME;
2640                 }
2641
2642                 if (s2->progressive_sequence && !s2->frame_pred_frame_dct)
2643                     av_log(s2->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
2644
2645                 if (s2->picture_structure == PICT_FRAME) {
2646                     s2->first_field = 0;
2647                     s2->v_edge_pos  = 16 * s2->mb_height;
2648                 } else {
2649                     s2->first_field ^= 1;
2650                     s2->v_edge_pos   = 8 * s2->mb_height;
2651                     memset(s2->mbskip_table, 0, s2->mb_stride * s2->mb_height);
2652                 }
2653             }
2654             if (start_code >= SLICE_MIN_START_CODE &&
2655                 start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2656                 const int field_pic = s2->picture_structure != PICT_FRAME;
2657                 int mb_y = start_code - SLICE_MIN_START_CODE;
2658                 last_code = SLICE_MIN_START_CODE;
2659                 if (s2->codec_id != AV_CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
2660                     mb_y += (*buf_ptr&0xE0)<<2;
2661
2662                 mb_y <<= field_pic;
2663                 if (s2->picture_structure == PICT_BOTTOM_FIELD)
2664                     mb_y++;
2665
2666                 if (buf_end - buf_ptr < 2) {
2667                     av_log(s2->avctx, AV_LOG_ERROR, "slice too small\n");
2668                     return AVERROR_INVALIDDATA;
2669                 }
2670
2671                 if (mb_y >= s2->mb_height) {
2672                     av_log(s2->avctx, AV_LOG_ERROR,
2673                            "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2674                     return AVERROR_INVALIDDATA;
2675                 }
2676
2677                 if (!s2->last_picture_ptr) {
2678                     /* Skip B-frames if we do not have reference frames and
2679                      * GOP is not closed. */
2680                     if (s2->pict_type == AV_PICTURE_TYPE_B) {
2681                         if (!s2->closed_gop) {
2682                             skip_frame = 1;
2683                             av_log(s2->avctx, AV_LOG_DEBUG,
2684                                    "Skipping B slice due to open GOP\n");
2685                             break;
2686                         }
2687                     }
2688                 }
2689                 if (s2->pict_type == AV_PICTURE_TYPE_I || (s2->avctx->flags2 & AV_CODEC_FLAG2_SHOW_ALL))
2690                     s->sync = 1;
2691                 if (!s2->next_picture_ptr) {
2692                     /* Skip P-frames if we do not have a reference frame or
2693                      * we have an invalid header. */
2694                     if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
2695                         skip_frame = 1;
2696                         av_log(s2->avctx, AV_LOG_DEBUG,
2697                                "Skipping P slice due to !sync\n");
2698                         break;
2699                     }
2700                 }
2701                 if ((avctx->skip_frame >= AVDISCARD_NONREF &&
2702                      s2->pict_type == AV_PICTURE_TYPE_B) ||
2703                     (avctx->skip_frame >= AVDISCARD_NONKEY &&
2704                      s2->pict_type != AV_PICTURE_TYPE_I) ||
2705                     avctx->skip_frame >= AVDISCARD_ALL) {
2706                     skip_frame = 1;
2707                     break;
2708                 }
2709
2710                 if (!s->mpeg_enc_ctx_allocated)
2711                     break;
2712
2713                 if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2714                     if (mb_y < avctx->skip_top ||
2715                         mb_y >= s2->mb_height - avctx->skip_bottom)
2716                         break;
2717                 }
2718
2719                 if (!s2->pict_type) {
2720                     av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2721                     if (avctx->err_recognition & AV_EF_EXPLODE)
2722                         return AVERROR_INVALIDDATA;
2723                     break;
2724                 }
2725
2726                 if (s->first_slice) {
2727                     skip_frame     = 0;
2728                     s->first_slice = 0;
2729                     if ((ret = mpeg_field_start(s2, buf, buf_size)) < 0)
2730                         return ret;
2731                 }
2732                 if (!s2->current_picture_ptr) {
2733                     av_log(avctx, AV_LOG_ERROR,
2734                            "current_picture not initialized\n");
2735                     return AVERROR_INVALIDDATA;
2736                 }
2737
2738                 if (HAVE_THREADS &&
2739                     (avctx->active_thread_type & FF_THREAD_SLICE) &&
2740                     !avctx->hwaccel) {
2741                     int threshold = (s2->mb_height * s->slice_count +
2742                                      s2->slice_context_count / 2) /
2743                                     s2->slice_context_count;
2744                     av_assert0(avctx->thread_count > 1);
2745                     if (threshold <= mb_y) {
2746                         MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2747
2748                         thread_context->start_mb_y = mb_y;
2749                         thread_context->end_mb_y   = s2->mb_height;
2750                         if (s->slice_count) {
2751                             s2->thread_context[s->slice_count - 1]->end_mb_y = mb_y;
2752                             ret = ff_update_duplicate_context(thread_context, s2);
2753                             if (ret < 0)
2754                                 return ret;
2755                         }
2756                         init_get_bits(&thread_context->gb, buf_ptr, input_size * 8);
2757                         s->slice_count++;
2758                     }
2759                     buf_ptr += 2; // FIXME add minimum number of bytes per slice
2760                 } else {
2761                     ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2762                     emms_c();
2763
2764                     if (ret < 0) {
2765                         if (avctx->err_recognition & AV_EF_EXPLODE)
2766                             return ret;
2767                         if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2768                             ff_er_add_slice(&s2->er, s2->resync_mb_x,
2769                                             s2->resync_mb_y, s2->mb_x, s2->mb_y,
2770                                             ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2771                     } else {
2772                         ff_er_add_slice(&s2->er, s2->resync_mb_x,
2773                                         s2->resync_mb_y, s2->mb_x - 1, s2->mb_y,
2774                                         ER_AC_END | ER_DC_END | ER_MV_END);
2775                     }
2776                 }
2777             }
2778             break;
2779         }
2780     }
2781 }
2782
2783 static int mpeg_decode_frame(AVCodecContext *avctx, void *data,
2784                              int *got_output, AVPacket *avpkt)
2785 {
2786     const uint8_t *buf = avpkt->data;
2787     int ret;
2788     int buf_size = avpkt->size;
2789     Mpeg1Context *s = avctx->priv_data;
2790     AVFrame *picture = data;
2791     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2792
2793     if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2794         /* special case for last picture */
2795         if (s2->low_delay == 0 && s2->next_picture_ptr) {
2796             int ret = av_frame_ref(picture, s2->next_picture_ptr->f);
2797             if (ret < 0)
2798                 return ret;
2799
2800             s2->next_picture_ptr = NULL;
2801
2802             *got_output = 1;
2803         }
2804         return buf_size;
2805     }
2806
2807     if (s2->avctx->flags & AV_CODEC_FLAG_TRUNCATED) {
2808         int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf,
2809                                            buf_size, NULL);
2810
2811         if (ff_combine_frame(&s2->parse_context, next,
2812                              (const uint8_t **) &buf, &buf_size) < 0)
2813             return buf_size;
2814     }
2815
2816     s2->codec_tag = avpriv_toupper4(avctx->codec_tag);
2817     if (s->mpeg_enc_ctx_allocated == 0 && (   s2->codec_tag == AV_RL32("VCR2")
2818                                            || s2->codec_tag == AV_RL32("BW10")
2819                                           ))
2820         vcr2_init_sequence(avctx);
2821
2822     s->slice_count = 0;
2823
2824     if (avctx->extradata && !s->extradata_decoded) {
2825         ret = decode_chunks(avctx, picture, got_output,
2826                             avctx->extradata, avctx->extradata_size);
2827         if (*got_output) {
2828             av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
2829             av_frame_unref(picture);
2830             *got_output = 0;
2831         }
2832         s->extradata_decoded = 1;
2833         if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) {
2834             s2->current_picture_ptr = NULL;
2835             return ret;
2836         }
2837     }
2838
2839     ret = decode_chunks(avctx, picture, got_output, buf, buf_size);
2840     if (ret<0 || *got_output) {
2841         s2->current_picture_ptr = NULL;
2842
2843         if (s2->timecode_frame_start != -1 && *got_output) {
2844             char tcbuf[AV_TIMECODE_STR_SIZE];
2845             AVFrameSideData *tcside = av_frame_new_side_data(picture,
2846                                                              AV_FRAME_DATA_GOP_TIMECODE,
2847                                                              sizeof(int64_t));
2848             if (!tcside)
2849                 return AVERROR(ENOMEM);
2850             memcpy(tcside->data, &s2->timecode_frame_start, sizeof(int64_t));
2851
2852             av_timecode_make_mpeg_tc_string(tcbuf, s2->timecode_frame_start);
2853             av_dict_set(&picture->metadata, "timecode", tcbuf, 0);
2854
2855             s2->timecode_frame_start = -1;
2856         }
2857     }
2858
2859     return ret;
2860 }
2861
2862 static void flush(AVCodecContext *avctx)
2863 {
2864     Mpeg1Context *s = avctx->priv_data;
2865
2866     s->sync       = 0;
2867
2868     ff_mpeg_flush(avctx);
2869 }
2870
2871 static av_cold int mpeg_decode_end(AVCodecContext *avctx)
2872 {
2873     Mpeg1Context *s = avctx->priv_data;
2874
2875     if (s->mpeg_enc_ctx_allocated)
2876         ff_mpv_common_end(&s->mpeg_enc_ctx);
2877     av_buffer_unref(&s->a53_buf_ref);
2878     return 0;
2879 }
2880
2881 const AVCodec ff_mpeg1video_decoder = {
2882     .name                  = "mpeg1video",
2883     .long_name             = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2884     .type                  = AVMEDIA_TYPE_VIDEO,
2885     .id                    = AV_CODEC_ID_MPEG1VIDEO,
2886     .priv_data_size        = sizeof(Mpeg1Context),
2887     .init                  = mpeg_decode_init,
2888     .close                 = mpeg_decode_end,
2889     .decode                = mpeg_decode_frame,
2890     .capabilities          = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2891                              AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2892                              AV_CODEC_CAP_SLICE_THREADS,
2893     .caps_internal         = FF_CODEC_CAP_INIT_THREADSAFE |
2894                              FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
2895     .flush                 = flush,
2896     .max_lowres            = 3,
2897     .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context),
2898     .hw_configs            = (const AVCodecHWConfigInternal *const []) {
2899 #if CONFIG_MPEG1_NVDEC_HWACCEL
2900                                HWACCEL_NVDEC(mpeg1),
2901 #endif
2902 #if CONFIG_MPEG1_VDPAU_HWACCEL
2903                                HWACCEL_VDPAU(mpeg1),
2904 #endif
2905 #if CONFIG_MPEG1_VIDEOTOOLBOX_HWACCEL
2906                                HWACCEL_VIDEOTOOLBOX(mpeg1),
2907 #endif
2908 #if CONFIG_MPEG1_XVMC_HWACCEL
2909                                HWACCEL_XVMC(mpeg1),
2910 #endif
2911                                NULL
2912                            },
2913 };
2914
2915 const AVCodec ff_mpeg2video_decoder = {
2916     .name           = "mpeg2video",
2917     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2918     .type           = AVMEDIA_TYPE_VIDEO,
2919     .id             = AV_CODEC_ID_MPEG2VIDEO,
2920     .priv_data_size = sizeof(Mpeg1Context),
2921     .init           = mpeg_decode_init,
2922     .close          = mpeg_decode_end,
2923     .decode         = mpeg_decode_frame,
2924     .capabilities   = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2925                       AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2926                       AV_CODEC_CAP_SLICE_THREADS,
2927     .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE |
2928                       FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
2929     .flush          = flush,
2930     .max_lowres     = 3,
2931     .profiles       = NULL_IF_CONFIG_SMALL(ff_mpeg2_video_profiles),
2932     .hw_configs     = (const AVCodecHWConfigInternal *const []) {
2933 #if CONFIG_MPEG2_DXVA2_HWACCEL
2934                         HWACCEL_DXVA2(mpeg2),
2935 #endif
2936 #if CONFIG_MPEG2_D3D11VA_HWACCEL
2937                         HWACCEL_D3D11VA(mpeg2),
2938 #endif
2939 #if CONFIG_MPEG2_D3D11VA2_HWACCEL
2940                         HWACCEL_D3D11VA2(mpeg2),
2941 #endif
2942 #if CONFIG_MPEG2_NVDEC_HWACCEL
2943                         HWACCEL_NVDEC(mpeg2),
2944 #endif
2945 #if CONFIG_MPEG2_VAAPI_HWACCEL
2946                         HWACCEL_VAAPI(mpeg2),
2947 #endif
2948 #if CONFIG_MPEG2_VDPAU_HWACCEL
2949                         HWACCEL_VDPAU(mpeg2),
2950 #endif
2951 #if CONFIG_MPEG2_VIDEOTOOLBOX_HWACCEL
2952                         HWACCEL_VIDEOTOOLBOX(mpeg2),
2953 #endif
2954 #if CONFIG_MPEG2_XVMC_HWACCEL
2955                         HWACCEL_XVMC(mpeg2),
2956 #endif
2957                         NULL
2958                     },
2959 };
2960
2961 //legacy decoder
2962 const AVCodec ff_mpegvideo_decoder = {
2963     .name           = "mpegvideo",
2964     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2965     .type           = AVMEDIA_TYPE_VIDEO,
2966     .id             = AV_CODEC_ID_MPEG2VIDEO,
2967     .priv_data_size = sizeof(Mpeg1Context),
2968     .init           = mpeg_decode_init,
2969     .close          = mpeg_decode_end,
2970     .decode         = mpeg_decode_frame,
2971     .capabilities   = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 | AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SLICE_THREADS,
2972     .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE |
2973                       FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
2974     .flush          = flush,
2975     .max_lowres     = 3,
2976 };
2977
2978 typedef struct IPUContext {
2979     MpegEncContext m;
2980
2981     int flags;
2982     DECLARE_ALIGNED(32, int16_t, block)[6][64];
2983 } IPUContext;
2984
2985 static int ipu_decode_frame(AVCodecContext *avctx, void *data,
2986                             int *got_frame, AVPacket *avpkt)
2987 {
2988     IPUContext *s = avctx->priv_data;
2989     MpegEncContext *m = &s->m;
2990     GetBitContext *gb = &m->gb;
2991     AVFrame * const frame = data;
2992     int ret;
2993
2994     ret = ff_get_buffer(avctx, frame, 0);
2995     if (ret < 0)
2996         return ret;
2997
2998     ret = init_get_bits8(gb, avpkt->data, avpkt->size);
2999     if (ret < 0)
3000         return ret;
3001
3002     s->flags = get_bits(gb, 8);
3003     m->intra_dc_precision = s->flags & 3;
3004     m->q_scale_type = !!(s->flags & 0x40);
3005     m->intra_vlc_format = !!(s->flags & 0x20);
3006     m->alternate_scan = !!(s->flags & 0x10);
3007
3008     if (s->flags & 0x10) {
3009         ff_init_scantable(m->idsp.idct_permutation, &m->inter_scantable, ff_alternate_vertical_scan);
3010         ff_init_scantable(m->idsp.idct_permutation, &m->intra_scantable, ff_alternate_vertical_scan);
3011     } else {
3012         ff_init_scantable(m->idsp.idct_permutation, &m->inter_scantable, ff_zigzag_direct);
3013         ff_init_scantable(m->idsp.idct_permutation, &m->intra_scantable, ff_zigzag_direct);
3014     }
3015
3016     m->last_dc[0] = m->last_dc[1] = m->last_dc[2] = 1 << (7 + (s->flags & 3));
3017     m->qscale = 1;
3018
3019     for (int y = 0; y < avctx->height; y += 16) {
3020         int intraquant;
3021
3022         for (int x = 0; x < avctx->width; x += 16) {
3023             if (x || y) {
3024                 if (!get_bits1(gb))
3025                     return AVERROR_INVALIDDATA;
3026             }
3027             if (get_bits1(gb)) {
3028                 intraquant = 0;
3029             } else {
3030                 if (!get_bits1(gb))
3031                     return AVERROR_INVALIDDATA;
3032                 intraquant = 1;
3033             }
3034
3035             if (s->flags & 4)
3036                 skip_bits1(gb);
3037
3038             if (intraquant)
3039                 m->qscale = mpeg_get_qscale(m);
3040
3041             memset(s->block, 0, sizeof(s->block));
3042
3043             for (int n = 0; n < 6; n++) {
3044                 if (s->flags & 0x80) {
3045                     ret = ff_mpeg1_decode_block_intra(&m->gb,
3046                                                       m->intra_matrix,
3047                                                       m->intra_scantable.permutated,
3048                                                       m->last_dc, s->block[n],
3049                                                       n, m->qscale);
3050                     if (ret >= 0)
3051                         m->block_last_index[n] = ret;
3052                 } else {
3053                     ret = mpeg2_decode_block_intra(m, s->block[n], n);
3054                 }
3055
3056                 if (ret < 0)
3057                     return ret;
3058             }
3059
3060             m->idsp.idct_put(frame->data[0] + y * frame->linesize[0] + x,
3061                              frame->linesize[0], s->block[0]);
3062             m->idsp.idct_put(frame->data[0] + y * frame->linesize[0] + x + 8,
3063                              frame->linesize[0], s->block[1]);
3064             m->idsp.idct_put(frame->data[0] + (y + 8) * frame->linesize[0] + x,
3065                              frame->linesize[0], s->block[2]);
3066             m->idsp.idct_put(frame->data[0] + (y + 8) * frame->linesize[0] + x + 8,
3067                              frame->linesize[0], s->block[3]);
3068             m->idsp.idct_put(frame->data[1] + (y >> 1) * frame->linesize[1] + (x >> 1),
3069                              frame->linesize[1], s->block[4]);
3070             m->idsp.idct_put(frame->data[2] + (y >> 1) * frame->linesize[2] + (x >> 1),
3071                              frame->linesize[2], s->block[5]);
3072         }
3073     }
3074
3075     align_get_bits(gb);
3076     if (get_bits_left(gb) != 32)
3077         return AVERROR_INVALIDDATA;
3078
3079     frame->pict_type = AV_PICTURE_TYPE_I;
3080     frame->key_frame = 1;
3081     *got_frame = 1;
3082
3083     return avpkt->size;
3084 }
3085
3086 static av_cold int ipu_decode_init(AVCodecContext *avctx)
3087 {
3088     IPUContext *s = avctx->priv_data;
3089     MpegEncContext *m = &s->m;
3090
3091     avctx->pix_fmt = AV_PIX_FMT_YUV420P;
3092
3093     ff_mpv_decode_init(m, avctx);
3094     ff_mpv_idct_init(m);
3095     ff_mpeg12_common_init(m);
3096     ff_mpeg12_init_vlcs();
3097
3098     for (int i = 0; i < 64; i++) {
3099         int j = m->idsp.idct_permutation[i];
3100         int v = ff_mpeg1_default_intra_matrix[i];
3101         m->intra_matrix[j]        = v;
3102         m->chroma_intra_matrix[j] = v;
3103     }
3104
3105     for (int i = 0; i < 64; i++) {
3106         int j = m->idsp.idct_permutation[i];
3107         int v = ff_mpeg1_default_non_intra_matrix[i];
3108         m->inter_matrix[j]        = v;
3109         m->chroma_inter_matrix[j] = v;
3110     }
3111
3112     return 0;
3113 }
3114
3115 static av_cold int ipu_decode_end(AVCodecContext *avctx)
3116 {
3117     IPUContext *s = avctx->priv_data;
3118
3119     ff_mpv_common_end(&s->m);
3120
3121     return 0;
3122 }
3123
3124 const AVCodec ff_ipu_decoder = {
3125     .name           = "ipu",
3126     .long_name      = NULL_IF_CONFIG_SMALL("IPU Video"),
3127     .type           = AVMEDIA_TYPE_VIDEO,
3128     .id             = AV_CODEC_ID_IPU,
3129     .priv_data_size = sizeof(IPUContext),
3130     .init           = ipu_decode_init,
3131     .decode         = ipu_decode_frame,
3132     .close          = ipu_decode_end,
3133     .capabilities   = AV_CODEC_CAP_DR1,
3134     .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
3135 };