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