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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 #include "libavutil/attributes.h"
  29 #include "libavutil/internal.h"
  30 #include "internal.h"
  31 #include "avcodec.h"
  32 #include "dsputil.h"
  33 #include "mpegvideo.h"
  34 #include "error_resilience.h"
  35 #include "mpeg12.h"
  36 #include "mpeg12data.h"
  37 #include "bytestream.h"
  38 #include "vdpau_internal.h"
  39 #include "xvmc_internal.h"
  40 #include "thread.h"
  41 #include "version.h"
  42
  43 typedef struct Mpeg1Context {
  44     MpegEncContext mpeg_enc_ctx;
  45     int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
  46     int repeat_field; /* true if we must repeat the field */
  47     AVPanScan pan_scan;              /**< some temporary storage for the panscan */
  48     int slice_count;
  49     int save_aspect_info;
  50     int save_width, save_height, save_progressive_seq;
  51     AVRational frame_rate_ext;       ///< MPEG-2 specific framerate modificator
  52     int sync;                        ///< Did we reach a sync point like a GOP/SEQ/KEYFrame?
  53     int tmpgexs;
  54     int extradata_decoded;
  55 } Mpeg1Context;
  56
  57 #define MB_TYPE_ZERO_MV   0x20000000
  58
  59 static const uint32_t ptype2mb_type[7] = {
  60                     MB_TYPE_INTRA,
  61                     MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
  62                     MB_TYPE_L0,
  63                     MB_TYPE_L0 | MB_TYPE_CBP,
  64     MB_TYPE_QUANT | MB_TYPE_INTRA,
  65     MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
  66     MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
  67 };
  68
  69 static const uint32_t btype2mb_type[11] = {
  70                     MB_TYPE_INTRA,
  71                     MB_TYPE_L1,
  72                     MB_TYPE_L1   | MB_TYPE_CBP,
  73                     MB_TYPE_L0,
  74                     MB_TYPE_L0   | MB_TYPE_CBP,
  75                     MB_TYPE_L0L1,
  76                     MB_TYPE_L0L1 | MB_TYPE_CBP,
  77     MB_TYPE_QUANT | MB_TYPE_INTRA,
  78     MB_TYPE_QUANT | MB_TYPE_L1   | MB_TYPE_CBP,
  79     MB_TYPE_QUANT | MB_TYPE_L0   | MB_TYPE_CBP,
  80     MB_TYPE_QUANT | MB_TYPE_L0L1 | MB_TYPE_CBP,
  81 };
  82
  83 static const uint8_t non_linear_qscale[32] = {
  84     0, 1, 2, 3, 4, 5, 6, 7,
  85     8,10,12,14,16,18,20,22,
  86     24,28,32,36,40,44,48,52,
  87     56,64,72,80,88,96,104,112,
  88 };
  89
  90 /* as H.263, but only 17 codes */
  91 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
  92 {
  93     int code, sign, val, shift;
  94
  95     code = get_vlc2(&s->gb, ff_mv_vlc.table, MV_VLC_BITS, 2);
  96     if (code == 0) {
  97         return pred;
  98     }
  99     if (code < 0) {
 100         return 0xffff;
 101     }
 102
 103     sign  = get_bits1(&s->gb);
 104     shift = fcode - 1;
 105     val   = code;
 106     if (shift) {
 107         val  = (val - 1) << shift;
 108         val |= get_bits(&s->gb, shift);
 109         val++;
 110     }
 111     if (sign)
 112         val = -val;
 113     val += pred;
 114
 115     /* modulo decoding */
 116     return sign_extend(val, 5 + shift);
 117 }
 118
 119 static inline int mpeg1_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
 120 {
 121     int level, dc, diff, i, j, run;
 122     int component;
 123     RLTable *rl = &ff_rl_mpeg1;
 124     uint8_t * const scantable    = s->intra_scantable.permutated;
 125     const uint16_t *quant_matrix = s->intra_matrix;
 126     const int qscale             = s->qscale;
 127
 128     /* DC coefficient */
 129     component = (n <= 3 ? 0 : n - 4 + 1);
 130     diff = decode_dc(&s->gb, component);
 131     if (diff >= 0xffff)
 132         return -1;
 133     dc  = s->last_dc[component];
 134     dc += diff;
 135     s->last_dc[component] = dc;
 136     block[0] = dc * quant_matrix[0];
 137     av_dlog(s->avctx, "dc=%d diff=%d\n", dc, diff);
 138     i = 0;
 139     {
 140         OPEN_READER(re, &s->gb);
 141         /* now quantify & encode AC coefficients */
 142         for (;;) {
 143             UPDATE_CACHE(re, &s->gb);
 144             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
 145
 146             if (level == 127) {
 147                 break;
 148             } else if (level != 0) {
 149                 i += run;
 150                 j = scantable[i];
 151                 level = (level * qscale * quant_matrix[j]) >> 4;
 152                 level = (level - 1) | 1;
 153                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
 154                 LAST_SKIP_BITS(re, &s->gb, 1);
 155             } else {
 156                 /* escape */
 157                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
 158                 UPDATE_CACHE(re, &s->gb);
 159                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
 160                 if (level == -128) {
 161                     level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
 162                 } else if (level == 0) {
 163                     level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
 164                 }
 165                 i += run;
 166                 j = scantable[i];
 167                 if (level < 0) {
 168                     level = -level;
 169                     level = (level * qscale * quant_matrix[j]) >> 4;
 170                     level = (level - 1) | 1;
 171                     level = -level;
 172                 } else {
 173                     level = (level * qscale * quant_matrix[j]) >> 4;
 174                     level = (level - 1) | 1;
 175                 }
 176             }
 177             if (i > 63) {
 178                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
 179                 return -1;
 180             }
 181
 182             block[j] = level;
 183         }
 184         CLOSE_READER(re, &s->gb);
 185     }
 186     s->block_last_index[n] = i;
 187    return 0;
 188 }
 189
 190 int ff_mpeg1_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
 191 {
 192     return mpeg1_decode_block_intra(s, block, n);
 193 }
 194
 195 static inline int mpeg1_decode_block_inter(MpegEncContext *s, int16_t *block, int n)
 196 {
 197     int level, i, j, run;
 198     RLTable *rl = &ff_rl_mpeg1;
 199     uint8_t * const scantable    = s->intra_scantable.permutated;
 200     const uint16_t *quant_matrix = s->inter_matrix;
 201     const int qscale             = s->qscale;
 202
 203     {
 204         OPEN_READER(re, &s->gb);
 205         i = -1;
 206         // special case for first coefficient, no need to add second VLC table
 207         UPDATE_CACHE(re, &s->gb);
 208         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
 209             level = (3 * qscale * quant_matrix[0]) >> 5;
 210             level = (level - 1) | 1;
 211             if (GET_CACHE(re, &s->gb) & 0x40000000)
 212                 level = -level;
 213             block[0] = level;
 214             i++;
 215             SKIP_BITS(re, &s->gb, 2);
 216             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
 217                 goto end;
 218         }
 219         /* now quantify & encode AC coefficients */
 220         for (;;) {
 221             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
 222
 223             if (level != 0) {
 224                 i += run;
 225                 j = scantable[i];
 226                 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 227                 level = (level - 1) | 1;
 228                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
 229                 SKIP_BITS(re, &s->gb, 1);
 230             } else {
 231                 /* escape */
 232                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
 233                 UPDATE_CACHE(re, &s->gb);
 234                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
 235                 if (level == -128) {
 236                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
 237                 } else if (level == 0) {
 238                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
 239                 }
 240                 i += run;
 241                 j = scantable[i];
 242                 if (level < 0) {
 243                     level = -level;
 244                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 245                     level = (level - 1) | 1;
 246                     level = -level;
 247                 } else {
 248                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 249                     level = (level - 1) | 1;
 250                 }
 251             }
 252             if (i > 63) {
 253                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
 254                 return -1;
 255             }
 256
 257             block[j] = level;
 258             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
 259                 break;
 260             UPDATE_CACHE(re, &s->gb);
 261         }
 262 end:
 263         LAST_SKIP_BITS(re, &s->gb, 2);
 264         CLOSE_READER(re, &s->gb);
 265     }
 266     s->block_last_index[n] = i;
 267     return 0;
 268 }
 269
 270 /**
 271  * Note: this function can read out of range and crash for corrupt streams.
 272  * Changing this would eat up any speed benefits it has.
 273  * Do not use "fast" flag if you need the code to be robust.
 274  */
 275 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, int16_t *block, int n)
 276 {
 277     int level, i, j, run;
 278     RLTable *rl = &ff_rl_mpeg1;
 279     uint8_t * const scantable = s->intra_scantable.permutated;
 280     const int qscale          = s->qscale;
 281
 282     {
 283         OPEN_READER(re, &s->gb);
 284         i = -1;
 285         // special case for first coefficient, no need to add second VLC table
 286         UPDATE_CACHE(re, &s->gb);
 287         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
 288             level = (3 * qscale) >> 1;
 289             level = (level - 1) | 1;
 290             if (GET_CACHE(re, &s->gb) & 0x40000000)
 291                 level = -level;
 292             block[0] = level;
 293             i++;
 294             SKIP_BITS(re, &s->gb, 2);
 295             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
 296                 goto end;
 297         }
 298
 299         /* now quantify & encode AC coefficients */
 300         for (;;) {
 301             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
 302
 303             if (level != 0) {
 304                 i += run;
 305                 j = scantable[i];
 306                 level = ((level * 2 + 1) * qscale) >> 1;
 307                 level = (level - 1) | 1;
 308                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
 309                 SKIP_BITS(re, &s->gb, 1);
 310             } else {
 311                 /* escape */
 312                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
 313                 UPDATE_CACHE(re, &s->gb);
 314                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
 315                 if (level == -128) {
 316                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
 317                 } else if (level == 0) {
 318                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
 319                 }
 320                 i += run;
 321                 j = scantable[i];
 322                 if (level < 0) {
 323                     level = -level;
 324                     level = ((level * 2 + 1) * qscale) >> 1;
 325                     level = (level - 1) | 1;
 326                     level = -level;
 327                 } else {
 328                     level = ((level * 2 + 1) * qscale) >> 1;
 329                     level = (level - 1) | 1;
 330                 }
 331             }
 332
 333             block[j] = level;
 334             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
 335                 break;
 336             UPDATE_CACHE(re, &s->gb);
 337         }
 338 end:
 339         LAST_SKIP_BITS(re, &s->gb, 2);
 340         CLOSE_READER(re, &s->gb);
 341     }
 342     s->block_last_index[n] = i;
 343     return 0;
 344 }
 345
 346
 347 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s, int16_t *block, int n)
 348 {
 349     int level, i, j, run;
 350     RLTable *rl = &ff_rl_mpeg1;
 351     uint8_t * const scantable = s->intra_scantable.permutated;
 352     const uint16_t *quant_matrix;
 353     const int qscale = s->qscale;
 354     int mismatch;
 355
 356     mismatch = 1;
 357
 358     {
 359         OPEN_READER(re, &s->gb);
 360         i = -1;
 361         if (n < 4)
 362             quant_matrix = s->inter_matrix;
 363         else
 364             quant_matrix = s->chroma_inter_matrix;
 365
 366         // special case for first coefficient, no need to add second VLC table
 367         UPDATE_CACHE(re, &s->gb);
 368         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
 369             level= (3 * qscale * quant_matrix[0]) >> 5;
 370             if (GET_CACHE(re, &s->gb) & 0x40000000)
 371                 level = -level;
 372             block[0]  = level;
 373             mismatch ^= level;
 374             i++;
 375             SKIP_BITS(re, &s->gb, 2);
 376             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
 377                 goto end;
 378         }
 379
 380         /* now quantify & encode AC coefficients */
 381         for (;;) {
 382             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
 383
 384             if (level != 0) {
 385                 i += run;
 386                 j = scantable[i];
 387                 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 388                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
 389                 SKIP_BITS(re, &s->gb, 1);
 390             } else {
 391                 /* escape */
 392                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
 393                 UPDATE_CACHE(re, &s->gb);
 394                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
 395
 396                 i += run;
 397                 j = scantable[i];
 398                 if (level < 0) {
 399                     level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 400                     level = -level;
 401                 } else {
 402                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 403                 }
 404             }
 405             if (i > 63) {
 406                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
 407                 return -1;
 408             }
 409
 410             mismatch ^= level;
 411             block[j]  = level;
 412             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
 413                 break;
 414             UPDATE_CACHE(re, &s->gb);
 415         }
 416 end:
 417         LAST_SKIP_BITS(re, &s->gb, 2);
 418         CLOSE_READER(re, &s->gb);
 419     }
 420     block[63] ^= (mismatch & 1);
 421
 422     s->block_last_index[n] = i;
 423     return 0;
 424 }
 425
 426 /**
 427  * Note: this function can read out of range and crash for corrupt streams.
 428  * Changing this would eat up any speed benefits it has.
 429  * Do not use "fast" flag if you need the code to be robust.
 430  */
 431 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
 432                                                     int16_t *block, int n)
 433 {
 434     int level, i, j, run;
 435     RLTable *rl = &ff_rl_mpeg1;
 436     uint8_t * const scantable = s->intra_scantable.permutated;
 437     const int qscale          = s->qscale;
 438     OPEN_READER(re, &s->gb);
 439     i = -1;
 440
 441     // special case for first coefficient, no need to add second VLC table
 442     UPDATE_CACHE(re, &s->gb);
 443     if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
 444         level = (3 * qscale) >> 1;
 445         if (GET_CACHE(re, &s->gb) & 0x40000000)
 446             level = -level;
 447         block[0] = level;
 448         i++;
 449         SKIP_BITS(re, &s->gb, 2);
 450         if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
 451             goto end;
 452     }
 453
 454     /* now quantify & encode AC coefficients */
 455     for (;;) {
 456         GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
 457
 458         if (level != 0) {
 459             i += run;
 460             j  = scantable[i];
 461             level = ((level * 2 + 1) * qscale) >> 1;
 462             level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
 463             SKIP_BITS(re, &s->gb, 1);
 464         } else {
 465             /* escape */
 466             run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
 467             UPDATE_CACHE(re, &s->gb);
 468             level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
 469
 470             i += run;
 471             j  = scantable[i];
 472             if (level < 0) {
 473                 level = ((-level * 2 + 1) * qscale) >> 1;
 474                 level = -level;
 475             } else {
 476                 level = ((level * 2 + 1) * qscale) >> 1;
 477             }
 478         }
 479
 480         block[j] = level;
 481         if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
 482             break;
 483         UPDATE_CACHE(re, &s->gb);
 484     }
 485 end:
 486     LAST_SKIP_BITS(re, &s->gb, 2);
 487     CLOSE_READER(re, &s->gb);
 488     s->block_last_index[n] = i;
 489     return 0;
 490 }
 491
 492
 493 static inline int mpeg2_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
 494 {
 495     int level, dc, diff, i, j, run;
 496     int component;
 497     RLTable *rl;
 498     uint8_t * const scantable = s->intra_scantable.permutated;
 499     const uint16_t *quant_matrix;
 500     const int qscale = s->qscale;
 501     int mismatch;
 502
 503     /* DC coefficient */
 504     if (n < 4) {
 505         quant_matrix = s->intra_matrix;
 506         component = 0;
 507     } else {
 508         quant_matrix = s->chroma_intra_matrix;
 509         component = (n & 1) + 1;
 510     }
 511     diff = decode_dc(&s->gb, component);
 512     if (diff >= 0xffff)
 513         return -1;
 514     dc  = s->last_dc[component];
 515     dc += diff;
 516     s->last_dc[component] = dc;
 517     block[0] = dc << (3 - s->intra_dc_precision);
 518     av_dlog(s->avctx, "dc=%d\n", block[0]);
 519     mismatch = block[0] ^ 1;
 520     i = 0;
 521     if (s->intra_vlc_format)
 522         rl = &ff_rl_mpeg2;
 523     else
 524         rl = &ff_rl_mpeg1;
 525
 526     {
 527         OPEN_READER(re, &s->gb);
 528         /* now quantify & encode AC coefficients */
 529         for (;;) {
 530             UPDATE_CACHE(re, &s->gb);
 531             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
 532
 533             if (level == 127) {
 534                 break;
 535             } else if (level != 0) {
 536                 i += run;
 537                 j  = scantable[i];
 538                 level = (level * qscale * quant_matrix[j]) >> 4;
 539                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
 540                 LAST_SKIP_BITS(re, &s->gb, 1);
 541             } else {
 542                 /* escape */
 543                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
 544                 UPDATE_CACHE(re, &s->gb);
 545                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
 546                 i += run;
 547                 j  = scantable[i];
 548                 if (level < 0) {
 549                     level = (-level * qscale * quant_matrix[j]) >> 4;
 550                     level = -level;
 551                 } else {
 552                     level = (level * qscale * quant_matrix[j]) >> 4;
 553                 }
 554             }
 555             if (i > 63) {
 556                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
 557                 return -1;
 558             }
 559
 560             mismatch ^= level;
 561             block[j]  = level;
 562         }
 563         CLOSE_READER(re, &s->gb);
 564     }
 565     block[63] ^= mismatch & 1;
 566
 567     s->block_last_index[n] = i;
 568     return 0;
 569 }
 570
 571 /**
 572  * Note: this function can read out of range and crash for corrupt streams.
 573  * Changing this would eat up any speed benefits it has.
 574  * Do not use "fast" flag if you need the code to be robust.
 575  */
 576 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
 577 {
 578     int level, dc, diff, j, run;
 579     int component;
 580     RLTable *rl;
 581     uint8_t * scantable = s->intra_scantable.permutated;
 582     const uint16_t *quant_matrix;
 583     const int qscale = s->qscale;
 584
 585     /* DC coefficient */
 586     if (n < 4) {
 587         quant_matrix = s->intra_matrix;
 588         component = 0;
 589     } else {
 590         quant_matrix = s->chroma_intra_matrix;
 591         component = (n & 1) + 1;
 592     }
 593     diff = decode_dc(&s->gb, component);
 594     if (diff >= 0xffff)
 595         return -1;
 596     dc = s->last_dc[component];
 597     dc += diff;
 598     s->last_dc[component] = dc;
 599     block[0] = dc << (3 - s->intra_dc_precision);
 600     if (s->intra_vlc_format)
 601         rl = &ff_rl_mpeg2;
 602     else
 603         rl = &ff_rl_mpeg1;
 604
 605     {
 606         OPEN_READER(re, &s->gb);
 607         /* now quantify & encode AC coefficients */
 608         for (;;) {
 609             UPDATE_CACHE(re, &s->gb);
 610             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
 611
 612             if (level == 127) {
 613                 break;
 614             } else if (level != 0) {
 615                 scantable += run;
 616                 j = *scantable;
 617                 level = (level * qscale * quant_matrix[j]) >> 4;
 618                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
 619                 LAST_SKIP_BITS(re, &s->gb, 1);
 620             } else {
 621                 /* escape */
 622                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
 623                 UPDATE_CACHE(re, &s->gb);
 624                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
 625                 scantable += run;
 626                 j = *scantable;
 627                 if (level < 0) {
 628                     level = (-level * qscale * quant_matrix[j]) >> 4;
 629                     level = -level;
 630                 } else {
 631                     level = (level * qscale * quant_matrix[j]) >> 4;
 632                 }
 633             }
 634
 635             block[j] = level;
 636         }
 637         CLOSE_READER(re, &s->gb);
 638     }
 639
 640     s->block_last_index[n] = scantable - s->intra_scantable.permutated;
 641     return 0;
 642 }
 643
 644 /******************************************/
 645 /* decoding */
 646
 647 static inline int get_dmv(MpegEncContext *s)
 648 {
 649     if (get_bits1(&s->gb))
 650         return 1 - (get_bits1(&s->gb) << 1);
 651     else
 652         return 0;
 653 }
 654
 655 static inline int get_qscale(MpegEncContext *s)
 656 {
 657     int qscale = get_bits(&s->gb, 5);
 658     if (s->q_scale_type) {
 659         return non_linear_qscale[qscale];
 660     } else {
 661         return qscale << 1;
 662     }
 663 }
 664
 665 static void exchange_uv(MpegEncContext *s)
 666 {
 667     int16_t (*tmp)[64];
 668
 669     tmp           = s->pblocks[4];
 670     s->pblocks[4] = s->pblocks[5];
 671     s->pblocks[5] = tmp;
 672 }
 673
 674 /* motion type (for MPEG-2) */
 675 #define MT_FIELD 1
 676 #define MT_FRAME 2
 677 #define MT_16X8  2
 678 #define MT_DMV   3
 679
 680 static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
 681 {
 682     int i, j, k, cbp, val, mb_type, motion_type;
 683     const int mb_block_count = 4 + (1 << s->chroma_format);
 684
 685     av_dlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
 686
 687     av_assert2(s->mb_skipped == 0);
 688
 689     if (s->mb_skip_run-- != 0) {
 690         if (s->pict_type == AV_PICTURE_TYPE_P) {
 691             s->mb_skipped = 1;
 692             s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
 693         } else {
 694             int mb_type;
 695
 696             if (s->mb_x)
 697                 mb_type = s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
 698             else
 699                 mb_type = s->current_picture.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1]; // FIXME not sure if this is allowed in MPEG at all
 700             if (IS_INTRA(mb_type)) {
 701                 av_log(s->avctx, AV_LOG_ERROR, "skip with previntra\n");
 702                 return -1;
 703             }
 704             s->current_picture.mb_type[s->mb_x + s->mb_y*s->mb_stride] =
 705                 mb_type | MB_TYPE_SKIP;
 706
 707             if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
 708                 s->mb_skipped = 1;
 709         }
 710
 711         return 0;
 712     }
 713
 714     switch (s->pict_type) {
 715     default:
 716     case AV_PICTURE_TYPE_I:
 717         if (get_bits1(&s->gb) == 0) {
 718             if (get_bits1(&s->gb) == 0) {
 719                 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
 720                 return -1;
 721             }
 722             mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
 723         } else {
 724             mb_type = MB_TYPE_INTRA;
 725         }
 726         break;
 727     case AV_PICTURE_TYPE_P:
 728         mb_type = get_vlc2(&s->gb, ff_mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
 729         if (mb_type < 0) {
 730             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
 731             return -1;
 732         }
 733         mb_type = ptype2mb_type[mb_type];
 734         break;
 735     case AV_PICTURE_TYPE_B:
 736         mb_type = get_vlc2(&s->gb, ff_mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
 737         if (mb_type < 0) {
 738             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
 739             return -1;
 740         }
 741         mb_type = btype2mb_type[mb_type];
 742         break;
 743     }
 744     av_dlog(s->avctx, "mb_type=%x\n", mb_type);
 745 //    motion_type = 0; /* avoid warning */
 746     if (IS_INTRA(mb_type)) {
 747         s->dsp.clear_blocks(s->block[0]);
 748
 749         if (!s->chroma_y_shift) {
 750             s->dsp.clear_blocks(s->block[6]);
 751         }
 752
 753         /* compute DCT type */
 754         if (s->picture_structure == PICT_FRAME && // FIXME add an interlaced_dct coded var?
 755             !s->frame_pred_frame_dct) {
 756             s->interlaced_dct = get_bits1(&s->gb);
 757         }
 758
 759         if (IS_QUANT(mb_type))
 760             s->qscale = get_qscale(s);
 761
 762         if (s->concealment_motion_vectors) {
 763             /* just parse them */
 764             if (s->picture_structure != PICT_FRAME)
 765                 skip_bits1(&s->gb); /* field select */
 766
 767             s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
 768                 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
 769             s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
 770                 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
 771
 772             skip_bits1(&s->gb); /* marker */
 773         } else
 774             memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
 775         s->mb_intra = 1;
 776 #if FF_API_XVMC
 777 FF_DISABLE_DEPRECATION_WARNINGS
 778         // if 1, we memcpy blocks in xvmcvideo
 779         if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1) {
 780             ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
 781             if (s->swap_uv) {
 782                 exchange_uv(s);
 783             }
 784         }
 785 FF_ENABLE_DEPRECATION_WARNINGS
 786 #endif /* FF_API_XVMC */
 787
 788         if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
 789             if (s->flags2 & CODEC_FLAG2_FAST) {
 790                 for (i = 0; i < 6; i++) {
 791                     mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
 792                 }
 793             } else {
 794                 for (i = 0; i < mb_block_count; i++) {
 795                     if (mpeg2_decode_block_intra(s, *s->pblocks[i], i) < 0)
 796                         return -1;
 797                 }
 798             }
 799         } else {
 800             for (i = 0; i < 6; i++) {
 801                 if (mpeg1_decode_block_intra(s, *s->pblocks[i], i) < 0)
 802                     return -1;
 803             }
 804         }
 805     } else {
 806         if (mb_type & MB_TYPE_ZERO_MV) {
 807             av_assert2(mb_type & MB_TYPE_CBP);
 808
 809             s->mv_dir = MV_DIR_FORWARD;
 810             if (s->picture_structure == PICT_FRAME) {
 811                 if (s->picture_structure == PICT_FRAME
 812                     && !s->frame_pred_frame_dct)
 813                     s->interlaced_dct = get_bits1(&s->gb);
 814                 s->mv_type = MV_TYPE_16X16;
 815             } else {
 816                 s->mv_type = MV_TYPE_FIELD;
 817                 mb_type |= MB_TYPE_INTERLACED;
 818                 s->field_select[0][0] = s->picture_structure - 1;
 819             }
 820
 821             if (IS_QUANT(mb_type))
 822                 s->qscale = get_qscale(s);
 823
 824             s->last_mv[0][0][0] = 0;
 825             s->last_mv[0][0][1] = 0;
 826             s->last_mv[0][1][0] = 0;
 827             s->last_mv[0][1][1] = 0;
 828             s->mv[0][0][0] = 0;
 829             s->mv[0][0][1] = 0;
 830         } else {
 831             av_assert2(mb_type & MB_TYPE_L0L1);
 832             // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
 833             /* get additional motion vector type */
 834             if (s->picture_structure == PICT_FRAME && s->frame_pred_frame_dct)
 835                 motion_type = MT_FRAME;
 836             else {
 837                 motion_type = get_bits(&s->gb, 2);
 838                 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
 839                     s->interlaced_dct = get_bits1(&s->gb);
 840             }
 841
 842             if (IS_QUANT(mb_type))
 843                 s->qscale = get_qscale(s);
 844
 845             /* motion vectors */
 846             s->mv_dir = (mb_type >> 13) & 3;
 847             av_dlog(s->avctx, "motion_type=%d\n", motion_type);
 848             switch (motion_type) {
 849             case MT_FRAME: /* or MT_16X8 */
 850                 if (s->picture_structure == PICT_FRAME) {
 851                     mb_type |= MB_TYPE_16x16;
 852                     s->mv_type = MV_TYPE_16X16;
 853                     for (i = 0; i < 2; i++) {
 854                         if (USES_LIST(mb_type, i)) {
 855                             /* MT_FRAME */
 856                             s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
 857                                 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
 858                             s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
 859                                 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
 860                             /* full_pel: only for MPEG-1 */
 861                             if (s->full_pel[i]) {
 862                                 s->mv[i][0][0] <<= 1;
 863                                 s->mv[i][0][1] <<= 1;
 864                             }
 865                         }
 866                     }
 867                 } else {
 868                     mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
 869                     s->mv_type = MV_TYPE_16X8;
 870                     for (i = 0; i < 2; i++) {
 871                         if (USES_LIST(mb_type, i)) {
 872                             /* MT_16X8 */
 873                             for (j = 0; j < 2; j++) {
 874                                 s->field_select[i][j] = get_bits1(&s->gb);
 875                                 for (k = 0; k < 2; k++) {
 876                                     val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
 877                                                              s->last_mv[i][j][k]);
 878                                     s->last_mv[i][j][k] = val;
 879                                     s->mv[i][j][k]      = val;
 880                                 }
 881                             }
 882                         }
 883                     }
 884                 }
 885                 break;
 886             case MT_FIELD:
 887                 s->mv_type = MV_TYPE_FIELD;
 888                 if (s->picture_structure == PICT_FRAME) {
 889                     mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
 890                     for (i = 0; i < 2; i++) {
 891                         if (USES_LIST(mb_type, i)) {
 892                             for (j = 0; j < 2; j++) {
 893                                 s->field_select[i][j] = get_bits1(&s->gb);
 894                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
 895                                                          s->last_mv[i][j][0]);
 896                                 s->last_mv[i][j][0] = val;
 897                                 s->mv[i][j][0]      = val;
 898                                 av_dlog(s->avctx, "fmx=%d\n", val);
 899                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
 900                                                          s->last_mv[i][j][1] >> 1);
 901                                 s->last_mv[i][j][1] = val << 1;
 902                                 s->mv[i][j][1]      = val;
 903                                 av_dlog(s->avctx, "fmy=%d\n", val);
 904                             }
 905                         }
 906                     }
 907                 } else {
 908                     av_assert0(!s->progressive_sequence);
 909                     mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
 910                     for (i = 0; i < 2; i++) {
 911                         if (USES_LIST(mb_type, i)) {
 912                             s->field_select[i][0] = get_bits1(&s->gb);
 913                             for (k = 0; k < 2; k++) {
 914                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
 915                                                          s->last_mv[i][0][k]);
 916                                 s->last_mv[i][0][k] = val;
 917                                 s->last_mv[i][1][k] = val;
 918                                 s->mv[i][0][k]      = val;
 919                             }
 920                         }
 921                     }
 922                 }
 923                 break;
 924             case MT_DMV:
 925                 if(s->progressive_sequence){
 926                     av_log(s->avctx, AV_LOG_ERROR, "MT_DMV in progressive_sequence\n");
 927                     return -1;
 928                 }
 929                 s->mv_type = MV_TYPE_DMV;
 930                 for (i = 0; i < 2; i++) {
 931                     if (USES_LIST(mb_type, i)) {
 932                         int dmx, dmy, mx, my, m;
 933                         const int my_shift = s->picture_structure == PICT_FRAME;
 934
 935                         mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
 936                                                 s->last_mv[i][0][0]);
 937                         s->last_mv[i][0][0] = mx;
 938                         s->last_mv[i][1][0] = mx;
 939                         dmx = get_dmv(s);
 940                         my  = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
 941                                                  s->last_mv[i][0][1] >> my_shift);
 942                         dmy = get_dmv(s);
 943
 944
 945                         s->last_mv[i][0][1] = my << my_shift;
 946                         s->last_mv[i][1][1] = my << my_shift;
 947
 948                         s->mv[i][0][0] = mx;
 949                         s->mv[i][0][1] = my;
 950                         s->mv[i][1][0] = mx; // not used
 951                         s->mv[i][1][1] = my; // not used
 952
 953                         if (s->picture_structure == PICT_FRAME) {
 954                             mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
 955
 956                             // m = 1 + 2 * s->top_field_first;
 957                             m = s->top_field_first ? 1 : 3;
 958
 959                             /* top -> top pred */
 960                             s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
 961                             s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
 962                             m = 4 - m;
 963                             s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
 964                             s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
 965                         } else {
 966                             mb_type |= MB_TYPE_16x16;
 967
 968                             s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
 969                             s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
 970                             if (s->picture_structure == PICT_TOP_FIELD)
 971                                 s->mv[i][2][1]--;
 972                             else
 973                                 s->mv[i][2][1]++;
 974                         }
 975                     }
 976                 }
 977                 break;
 978             default:
 979                 av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
 980                 return -1;
 981             }
 982         }
 983
 984         s->mb_intra = 0;
 985         if (HAS_CBP(mb_type)) {
 986             s->dsp.clear_blocks(s->block[0]);
 987
 988             cbp = get_vlc2(&s->gb, ff_mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
 989             if (mb_block_count > 6) {
 990                  cbp <<= mb_block_count - 6;
 991                  cbp  |= get_bits(&s->gb, mb_block_count - 6);
 992                  s->dsp.clear_blocks(s->block[6]);
 993             }
 994             if (cbp <= 0) {
 995                 av_log(s->avctx, AV_LOG_ERROR, "invalid cbp %d at %d %d\n", cbp, s->mb_x, s->mb_y);
 996                 return -1;
 997             }
 998
 999 #if FF_API_XVMC
1000 FF_DISABLE_DEPRECATION_WARNINGS
1001             //if 1, we memcpy blocks in xvmcvideo
1002             if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1) {
1003                 ff_xvmc_pack_pblocks(s, cbp);
1004                 if (s->swap_uv) {
1005                     exchange_uv(s);
1006                 }
1007             }
1008 FF_ENABLE_DEPRECATION_WARNINGS
1009 #endif /* FF_API_XVMC */
1010
1011             if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
1012                 if (s->flags2 & CODEC_FLAG2_FAST) {
1013                     for (i = 0; i < 6; i++) {
1014                         if (cbp & 32) {
1015                             mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
1016                         } else {
1017                             s->block_last_index[i] = -1;
1018                         }
1019                         cbp += cbp;
1020                     }
1021                 } else {
1022                     cbp <<= 12-mb_block_count;
1023
1024                     for (i = 0; i < mb_block_count; i++) {
1025                         if (cbp & (1 << 11)) {
1026                             if (mpeg2_decode_block_non_intra(s, *s->pblocks[i], i) < 0)
1027                                 return -1;
1028                         } else {
1029                             s->block_last_index[i] = -1;
1030                         }
1031                         cbp += cbp;
1032                     }
1033                 }
1034             } else {
1035                 if (s->flags2 & CODEC_FLAG2_FAST) {
1036                     for (i = 0; i < 6; i++) {
1037                         if (cbp & 32) {
1038                             mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1039                         } else {
1040                             s->block_last_index[i] = -1;
1041                         }
1042                         cbp += cbp;
1043                     }
1044                 } else {
1045                     for (i = 0; i < 6; i++) {
1046                         if (cbp & 32) {
1047                             if (mpeg1_decode_block_inter(s, *s->pblocks[i], i) < 0)
1048                                 return -1;
1049                         } else {
1050                             s->block_last_index[i] = -1;
1051                         }
1052                         cbp += cbp;
1053                     }
1054                 }
1055             }
1056         } else {
1057             for (i = 0; i < 12; i++)
1058                 s->block_last_index[i] = -1;
1059         }
1060     }
1061
1062     s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1063
1064     return 0;
1065 }
1066
1067 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1068 {
1069     Mpeg1Context *s = avctx->priv_data;
1070     MpegEncContext *s2 = &s->mpeg_enc_ctx;
1071     int i;
1072
1073     /* we need some permutation to store matrices,
1074      * until MPV_common_init() sets the real permutation. */
1075     for (i = 0; i < 64; i++)
1076        s2->dsp.idct_permutation[i]=i;
1077
1078     ff_MPV_decode_defaults(s2);
1079
1080     s->mpeg_enc_ctx.avctx  = avctx;
1081     s->mpeg_enc_ctx.flags  = avctx->flags;
1082     s->mpeg_enc_ctx.flags2 = avctx->flags2;
1083     ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1084     ff_mpeg12_init_vlcs();
1085
1086     s->mpeg_enc_ctx_allocated      = 0;
1087     s->mpeg_enc_ctx.picture_number = 0;
1088     s->repeat_field                = 0;
1089     s->mpeg_enc_ctx.codec_id       = avctx->codec->id;
1090     avctx->color_range = AVCOL_RANGE_MPEG;
1091     if (avctx->codec->id == AV_CODEC_ID_MPEG1VIDEO)
1092         avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1093     else
1094         avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
1095     return 0;
1096 }
1097
1098 static int mpeg_decode_update_thread_context(AVCodecContext *avctx, const AVCodecContext *avctx_from)
1099 {
1100     Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1101     MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1102     int err;
1103
1104     if (avctx == avctx_from || !ctx_from->mpeg_enc_ctx_allocated || !s1->context_initialized)
1105         return 0;
1106
1107     err = ff_mpeg_update_thread_context(avctx, avctx_from);
1108     if (err) return err;
1109
1110     if (!ctx->mpeg_enc_ctx_allocated)
1111         memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1112
1113     if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1114         s->picture_number++;
1115
1116     return 0;
1117 }
1118
1119 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1120                                  const uint8_t *new_perm)
1121 {
1122     uint16_t temp_matrix[64];
1123     int i;
1124
1125     memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1126
1127     for (i = 0; i < 64; i++) {
1128         matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1129     }
1130 }
1131
1132 static const enum AVPixelFormat mpeg1_hwaccel_pixfmt_list_420[] = {
1133 #if FF_API_XVMC
1134 #if CONFIG_MPEG_XVMC_DECODER
1135     AV_PIX_FMT_XVMC_MPEG2_IDCT,
1136     AV_PIX_FMT_XVMC_MPEG2_MC,
1137 #endif
1138 #endif /* FF_API_XVMC */
1139 #if CONFIG_MPEG1_VDPAU_HWACCEL
1140     AV_PIX_FMT_VDPAU_MPEG1,
1141     AV_PIX_FMT_VDPAU,
1142 #endif
1143     AV_PIX_FMT_YUV420P,
1144     AV_PIX_FMT_NONE
1145 };
1146
1147 static const enum AVPixelFormat mpeg2_hwaccel_pixfmt_list_420[] = {
1148 #if FF_API_XVMC
1149 #if CONFIG_MPEG_XVMC_DECODER
1150     AV_PIX_FMT_XVMC_MPEG2_IDCT,
1151     AV_PIX_FMT_XVMC_MPEG2_MC,
1152 #endif
1153 #endif /* FF_API_XVMC */
1154 #if CONFIG_MPEG2_VDPAU_HWACCEL
1155     AV_PIX_FMT_VDPAU_MPEG2,
1156     AV_PIX_FMT_VDPAU,
1157 #endif
1158 #if CONFIG_MPEG2_DXVA2_HWACCEL
1159     AV_PIX_FMT_DXVA2_VLD,
1160 #endif
1161 #if CONFIG_MPEG2_VAAPI_HWACCEL
1162     AV_PIX_FMT_VAAPI_VLD,
1163 #endif
1164     AV_PIX_FMT_YUV420P,
1165     AV_PIX_FMT_NONE
1166 };
1167
1168 static inline int uses_vdpau(AVCodecContext *avctx) {
1169     return avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG1 || avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG2;
1170 }
1171
1172 static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
1173 {
1174     Mpeg1Context *s1 = avctx->priv_data;
1175     MpegEncContext *s = &s1->mpeg_enc_ctx;
1176
1177     if(s->chroma_format < 2) {
1178         return ff_thread_get_format(avctx,
1179                                 avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO ?
1180                                 mpeg1_hwaccel_pixfmt_list_420 :
1181                                 mpeg2_hwaccel_pixfmt_list_420);
1182     } else if(s->chroma_format == 2)
1183         return AV_PIX_FMT_YUV422P;
1184     else
1185         return AV_PIX_FMT_YUV444P;
1186 }
1187
1188 static void setup_hwaccel_for_pixfmt(AVCodecContext *avctx)
1189 {
1190 #if FF_API_XVMC
1191 FF_DISABLE_DEPRECATION_WARNINGS
1192     if (avctx->pix_fmt != AV_PIX_FMT_XVMC_MPEG2_IDCT && avctx->pix_fmt != AV_PIX_FMT_XVMC_MPEG2_MC) {
1193         avctx->xvmc_acceleration = 0;
1194     } else if (!avctx->xvmc_acceleration) {
1195         avctx->xvmc_acceleration = 2;
1196     }
1197 FF_ENABLE_DEPRECATION_WARNINGS
1198 #endif /* FF_API_XVMC */
1199     avctx->hwaccel = ff_find_hwaccel(avctx);
1200     // until then pix_fmt may be changed right after codec init
1201 #if FF_API_XVMC
1202     if (avctx->pix_fmt == AV_PIX_FMT_XVMC_MPEG2_IDCT ||
1203 #else
1204     if (
1205 #endif
1206         avctx->hwaccel || uses_vdpau(avctx))
1207         if (avctx->idct_algo == FF_IDCT_AUTO)
1208             avctx->idct_algo = FF_IDCT_SIMPLE;
1209 }
1210
1211 /* Call this function when we know all parameters.
1212  * It may be called in different places for MPEG-1 and MPEG-2. */
1213 static int mpeg_decode_postinit(AVCodecContext *avctx)
1214 {
1215     Mpeg1Context *s1 = avctx->priv_data;
1216     MpegEncContext *s = &s1->mpeg_enc_ctx;
1217     uint8_t old_permutation[64];
1218     int ret;
1219
1220     if ((s1->mpeg_enc_ctx_allocated == 0) ||
1221         avctx->coded_width  != s->width   ||
1222         avctx->coded_height != s->height  ||
1223         s1->save_width           != s->width                ||
1224         s1->save_height          != s->height               ||
1225         s1->save_aspect_info     != s->aspect_ratio_info    ||
1226         (s1->save_progressive_seq != s->progressive_sequence && (s->height&31)) ||
1227         0)
1228     {
1229
1230         if (s1->mpeg_enc_ctx_allocated) {
1231             ParseContext pc = s->parse_context;
1232             s->parse_context.buffer = 0;
1233             ff_MPV_common_end(s);
1234             s->parse_context = pc;
1235             s1->mpeg_enc_ctx_allocated = 0;
1236         }
1237
1238         if ((s->width == 0) || (s->height == 0))
1239             return -2;
1240
1241         ret = ff_set_dimensions(avctx, s->width, s->height);
1242         if (ret < 0)
1243             return ret;
1244
1245         if (avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->bit_rate) {
1246             avctx->rc_max_rate = s->bit_rate;
1247         } else if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && s->bit_rate &&
1248                    (s->bit_rate != 0x3FFFF*400 || s->vbv_delay != 0xFFFF)) {
1249             avctx->bit_rate = s->bit_rate;
1250         }
1251         s1->save_aspect_info     = s->aspect_ratio_info;
1252         s1->save_width           = s->width;
1253         s1->save_height          = s->height;
1254         s1->save_progressive_seq = s->progressive_sequence;
1255
1256         /* low_delay may be forced, in this case we will have B-frames
1257          * that behave like P-frames. */
1258         avctx->has_b_frames = !s->low_delay;
1259
1260         if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1261             //MPEG-1 fps
1262             avctx->time_base.den = ff_mpeg12_frame_rate_tab[s->frame_rate_index].num;
1263             avctx->time_base.num = ff_mpeg12_frame_rate_tab[s->frame_rate_index].den;
1264             //MPEG-1 aspect
1265             avctx->sample_aspect_ratio = av_d2q(1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1266             avctx->ticks_per_frame=1;
1267         } else {//MPEG-2
1268         //MPEG-2 fps
1269             av_reduce(&s->avctx->time_base.den,
1270                       &s->avctx->time_base.num,
1271                       ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num*2,
1272                       ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1273                       1 << 30);
1274             avctx->ticks_per_frame = 2;
1275             //MPEG-2 aspect
1276             if (s->aspect_ratio_info > 1) {
1277                 AVRational dar =
1278                     av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1279                                       (AVRational) {s1->pan_scan.width, s1->pan_scan.height}),
1280                              (AVRational) {s->width, s->height});
1281
1282                 // we ignore the spec here and guess a bit as reality does not match the spec, see for example
1283                 // res_change_ffmpeg_aspect.ts and sequence-display-aspect.mpg
1284                 // issue1613, 621, 562
1285                 if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1286                    (av_cmp_q(dar, (AVRational) {4, 3}) && av_cmp_q(dar, (AVRational) {16, 9}))) {
1287                     s->avctx->sample_aspect_ratio =
1288                         av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1289                                  (AVRational) {s->width, s->height});
1290                 } else {
1291                     s->avctx->sample_aspect_ratio =
1292                         av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1293                                  (AVRational) {s1->pan_scan.width, s1->pan_scan.height});
1294 //issue1613 4/3 16/9 -> 16/9
1295 //res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1296 //widescreen-issue562.mpg 4/3 16/9 -> 16/9
1297 //                    s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1298                     av_dlog(avctx, "A %d/%d\n",
1299                             ff_mpeg2_aspect[s->aspect_ratio_info].num, ff_mpeg2_aspect[s->aspect_ratio_info].den);
1300                     av_dlog(avctx, "B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1301                             s->avctx->sample_aspect_ratio.den);
1302                 }
1303             } else {
1304                 s->avctx->sample_aspect_ratio =
1305                     ff_mpeg2_aspect[s->aspect_ratio_info];
1306             }
1307         } // MPEG-2
1308
1309         avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1310         setup_hwaccel_for_pixfmt(avctx);
1311
1312         /* Quantization matrices may need reordering
1313          * if DCT permutation is changed. */
1314         memcpy(old_permutation, s->dsp.idct_permutation, 64 * sizeof(uint8_t));
1315
1316         if (ff_MPV_common_init(s) < 0)
1317             return -2;
1318
1319         quant_matrix_rebuild(s->intra_matrix,        old_permutation, s->dsp.idct_permutation);
1320         quant_matrix_rebuild(s->inter_matrix,        old_permutation, s->dsp.idct_permutation);
1321         quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->dsp.idct_permutation);
1322         quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->dsp.idct_permutation);
1323
1324         s1->mpeg_enc_ctx_allocated = 1;
1325     }
1326     return 0;
1327 }
1328
1329 static int mpeg1_decode_picture(AVCodecContext *avctx,
1330                                 const uint8_t *buf, int buf_size)
1331 {
1332     Mpeg1Context *s1 = avctx->priv_data;
1333     MpegEncContext *s = &s1->mpeg_enc_ctx;
1334     int ref, f_code, vbv_delay;
1335
1336     init_get_bits(&s->gb, buf, buf_size*8);
1337
1338     ref = get_bits(&s->gb, 10); /* temporal ref */
1339     s->pict_type = get_bits(&s->gb, 3);
1340     if (s->pict_type == 0 || s->pict_type > 3)
1341         return -1;
1342
1343     vbv_delay = get_bits(&s->gb, 16);
1344     s->vbv_delay = vbv_delay;
1345     if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
1346         s->full_pel[0] = get_bits1(&s->gb);
1347         f_code = get_bits(&s->gb, 3);
1348         if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1349             return -1;
1350         f_code += !f_code;
1351         s->mpeg_f_code[0][0] = f_code;
1352         s->mpeg_f_code[0][1] = f_code;
1353     }
1354     if (s->pict_type == AV_PICTURE_TYPE_B) {
1355         s->full_pel[1] = get_bits1(&s->gb);
1356         f_code = get_bits(&s->gb, 3);
1357         if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1358             return -1;
1359         f_code += !f_code;
1360         s->mpeg_f_code[1][0] = f_code;
1361         s->mpeg_f_code[1][1] = f_code;
1362     }
1363     s->current_picture.f.pict_type = s->pict_type;
1364     s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1365
1366     if (avctx->debug & FF_DEBUG_PICT_INFO)
1367         av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1368
1369     s->y_dc_scale = 8;
1370     s->c_dc_scale = 8;
1371     return 0;
1372 }
1373
1374 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1375 {
1376     MpegEncContext *s= &s1->mpeg_enc_ctx;
1377     int horiz_size_ext, vert_size_ext;
1378     int bit_rate_ext;
1379
1380     skip_bits(&s->gb, 1); /* profile and level esc*/
1381     s->avctx->profile       = get_bits(&s->gb, 3);
1382     s->avctx->level         = get_bits(&s->gb, 4);
1383     s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1384     s->chroma_format        = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1385     horiz_size_ext          = get_bits(&s->gb, 2);
1386     vert_size_ext           = get_bits(&s->gb, 2);
1387     s->width  |= (horiz_size_ext << 12);
1388     s->height |= (vert_size_ext  << 12);
1389     bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1390     s->bit_rate += (bit_rate_ext << 18) * 400;
1391     skip_bits1(&s->gb); /* marker */
1392     s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1393
1394     s->low_delay = get_bits1(&s->gb);
1395     if (s->flags & CODEC_FLAG_LOW_DELAY)
1396         s->low_delay = 1;
1397
1398     s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1399     s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1400
1401     av_dlog(s->avctx, "sequence extension\n");
1402     s->codec_id      = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1403
1404     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1405         av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d ps: %d cf:%d vbv buffer: %d, bitrate:%d\n",
1406                s->avctx->profile, s->avctx->level, s->progressive_sequence, s->chroma_format, s->avctx->rc_buffer_size, s->bit_rate);
1407
1408 }
1409
1410 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1411 {
1412     MpegEncContext *s = &s1->mpeg_enc_ctx;
1413     int color_description, w, h;
1414
1415     skip_bits(&s->gb, 3); /* video format */
1416     color_description = get_bits1(&s->gb);
1417     if (color_description) {
1418         s->avctx->color_primaries = get_bits(&s->gb, 8);
1419         s->avctx->color_trc       = get_bits(&s->gb, 8);
1420         s->avctx->colorspace      = get_bits(&s->gb, 8);
1421     }
1422     w = get_bits(&s->gb, 14);
1423     skip_bits(&s->gb, 1); //marker
1424     h = get_bits(&s->gb, 14);
1425     // remaining 3 bits are zero padding
1426
1427     s1->pan_scan.width  = 16 * w;
1428     s1->pan_scan.height = 16 * h;
1429
1430     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1431         av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1432 }
1433
1434 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1435 {
1436     MpegEncContext *s = &s1->mpeg_enc_ctx;
1437     int i, nofco;
1438
1439     nofco = 1;
1440     if (s->progressive_sequence) {
1441         if (s->repeat_first_field) {
1442             nofco++;
1443             if (s->top_field_first)
1444                 nofco++;
1445         }
1446     } else {
1447         if (s->picture_structure == PICT_FRAME) {
1448             nofco++;
1449             if (s->repeat_first_field)
1450                 nofco++;
1451         }
1452     }
1453     for (i = 0; i < nofco; i++) {
1454         s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1455         skip_bits(&s->gb, 1); // marker
1456         s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1457         skip_bits(&s->gb, 1); // marker
1458     }
1459
1460     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1461         av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1462                s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1463                s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1464                s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1465 }
1466
1467 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64], uint16_t matrix1[64], int intra)
1468 {
1469     int i;
1470
1471     for (i = 0; i < 64; i++) {
1472         int j = s->dsp.idct_permutation[ff_zigzag_direct[i]];
1473         int v = get_bits(&s->gb, 8);
1474         if (v == 0) {
1475             av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1476             return -1;
1477         }
1478         if (intra && i == 0 && v != 8) {
1479             av_log(s->avctx, AV_LOG_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v);
1480             v = 8; // needed by pink.mpg / issue1046
1481         }
1482         matrix0[j] = v;
1483         if (matrix1)
1484             matrix1[j] = v;
1485     }
1486     return 0;
1487 }
1488
1489 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1490 {
1491     av_dlog(s->avctx, "matrix extension\n");
1492
1493     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1494     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1495     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, NULL           , 1);
1496     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, NULL           , 0);
1497 }
1498
1499 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1500 {
1501     MpegEncContext *s = &s1->mpeg_enc_ctx;
1502
1503     s->full_pel[0] = s->full_pel[1] = 0;
1504     s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1505     s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1506     s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1507     s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1508     if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1509         av_log(s->avctx, AV_LOG_ERROR, "Missing picture start code, guessing missing values\n");
1510         if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1511             if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1512                 s->pict_type = AV_PICTURE_TYPE_I;
1513             else
1514                 s->pict_type = AV_PICTURE_TYPE_P;
1515         } else
1516             s->pict_type = AV_PICTURE_TYPE_B;
1517         s->current_picture.f.pict_type = s->pict_type;
1518         s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1519     }
1520     s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0];
1521     s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1];
1522     s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0];
1523     s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1];
1524
1525     s->intra_dc_precision         = get_bits(&s->gb, 2);
1526     s->picture_structure          = get_bits(&s->gb, 2);
1527     s->top_field_first            = get_bits1(&s->gb);
1528     s->frame_pred_frame_dct       = get_bits1(&s->gb);
1529     s->concealment_motion_vectors = get_bits1(&s->gb);
1530     s->q_scale_type               = get_bits1(&s->gb);
1531     s->intra_vlc_format           = get_bits1(&s->gb);
1532     s->alternate_scan             = get_bits1(&s->gb);
1533     s->repeat_first_field         = get_bits1(&s->gb);
1534     s->chroma_420_type            = get_bits1(&s->gb);
1535     s->progressive_frame          = get_bits1(&s->gb);
1536
1537
1538     if (s->alternate_scan) {
1539         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1540         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1541     } else {
1542         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1543         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1544     }
1545
1546     /* composite display not parsed */
1547     av_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1548     av_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1549     av_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1550     av_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1551     av_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1552     av_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1553     av_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1554     av_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1555     av_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1556 }
1557
1558 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1559 {
1560     AVCodecContext *avctx = s->avctx;
1561     Mpeg1Context *s1 = (Mpeg1Context*)s;
1562
1563     /* start frame decoding */
1564     if (s->first_field || s->picture_structure == PICT_FRAME) {
1565         AVFrameSideData *pan_scan;
1566
1567         if (ff_MPV_frame_start(s, avctx) < 0)
1568             return -1;
1569
1570         ff_mpeg_er_frame_start(s);
1571
1572         /* first check if we must repeat the frame */
1573         s->current_picture_ptr->f.repeat_pict = 0;
1574         if (s->repeat_first_field) {
1575             if (s->progressive_sequence) {
1576                 if (s->top_field_first)
1577                     s->current_picture_ptr->f.repeat_pict = 4;
1578                 else
1579                     s->current_picture_ptr->f.repeat_pict = 2;
1580             } else if (s->progressive_frame) {
1581                 s->current_picture_ptr->f.repeat_pict = 1;
1582             }
1583         }
1584
1585         pan_scan = av_frame_new_side_data(&s->current_picture_ptr->f,
1586                                           AV_FRAME_DATA_PANSCAN,
1587                                           sizeof(s1->pan_scan));
1588         if (!pan_scan)
1589             return AVERROR(ENOMEM);
1590         memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
1591
1592         if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1593             ff_thread_finish_setup(avctx);
1594     } else { // second field
1595         int i;
1596
1597         if (!s->current_picture_ptr) {
1598             av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1599             return -1;
1600         }
1601
1602         if (s->avctx->hwaccel &&
1603             (s->avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
1604             if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1605                 av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode first field\n");
1606         }
1607
1608         for (i = 0; i < 4; i++) {
1609             s->current_picture.f.data[i] = s->current_picture_ptr->f.data[i];
1610             if (s->picture_structure == PICT_BOTTOM_FIELD) {
1611                 s->current_picture.f.data[i] += s->current_picture_ptr->f.linesize[i];
1612             }
1613         }
1614     }
1615
1616     if (avctx->hwaccel) {
1617         if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
1618             return -1;
1619     }
1620
1621 #if FF_API_XVMC
1622 FF_DISABLE_DEPRECATION_WARNINGS
1623 // MPV_frame_start will call this function too,
1624 // but we need to call it on every field
1625     if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1626         if (ff_xvmc_field_start(s, avctx) < 0)
1627             return -1;
1628 FF_ENABLE_DEPRECATION_WARNINGS
1629 #endif /* FF_API_XVMC */
1630
1631     return 0;
1632 }
1633
1634 #define DECODE_SLICE_ERROR -1
1635 #define DECODE_SLICE_OK     0
1636
1637 /**
1638  * Decode a slice.
1639  * MpegEncContext.mb_y must be set to the MB row from the startcode.
1640  * @return DECODE_SLICE_ERROR if the slice is damaged,
1641  *         DECODE_SLICE_OK if this slice is OK
1642  */
1643 static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1644                              const uint8_t **buf, int buf_size)
1645 {
1646     AVCodecContext *avctx = s->avctx;
1647     const int lowres      = s->avctx->lowres;
1648     const int field_pic   = s->picture_structure != PICT_FRAME;
1649
1650     s->resync_mb_x =
1651     s->resync_mb_y = -1;
1652
1653     av_assert0(mb_y < s->mb_height);
1654
1655     init_get_bits(&s->gb, *buf, buf_size * 8);
1656     if(s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1657         skip_bits(&s->gb, 3);
1658
1659     ff_mpeg1_clean_buffers(s);
1660     s->interlaced_dct = 0;
1661
1662     s->qscale = get_qscale(s);
1663
1664     if (s->qscale == 0) {
1665         av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1666         return -1;
1667     }
1668
1669     /* extra slice info */
1670     if (skip_1stop_8data_bits(&s->gb) < 0)
1671         return AVERROR_INVALIDDATA;
1672
1673     s->mb_x = 0;
1674
1675     if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1676         skip_bits1(&s->gb);
1677     } else {
1678         while (get_bits_left(&s->gb) > 0) {
1679             int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1680                                 MBINCR_VLC_BITS, 2);
1681             if (code < 0) {
1682                 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1683                 return -1;
1684             }
1685             if (code >= 33) {
1686                 if (code == 33) {
1687                     s->mb_x += 33;
1688                 }
1689                 /* otherwise, stuffing, nothing to do */
1690             } else {
1691                 s->mb_x += code;
1692                 break;
1693             }
1694         }
1695     }
1696
1697     if (s->mb_x >= (unsigned)s->mb_width) {
1698         av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1699         return -1;
1700     }
1701
1702     if (avctx->hwaccel) {
1703         const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1704         int start_code = -1;
1705         buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1706         if (buf_end < *buf + buf_size)
1707             buf_end -= 4;
1708         s->mb_y = mb_y;
1709         if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1710             return DECODE_SLICE_ERROR;
1711         *buf = buf_end;
1712         return DECODE_SLICE_OK;
1713     }
1714
1715     s->resync_mb_x = s->mb_x;
1716     s->resync_mb_y = s->mb_y = mb_y;
1717     s->mb_skip_run = 0;
1718     ff_init_block_index(s);
1719
1720     if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1721         if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1722              av_log(s->avctx, AV_LOG_DEBUG, "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",
1723                     s->qscale, s->mpeg_f_code[0][0], s->mpeg_f_code[0][1], s->mpeg_f_code[1][0], s->mpeg_f_code[1][1],
1724                     s->pict_type == AV_PICTURE_TYPE_I ? "I" : (s->pict_type == AV_PICTURE_TYPE_P ? "P" : (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
1725                     s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1726                     s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1727                     s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1728         }
1729     }
1730
1731     for (;;) {
1732 #if FF_API_XVMC
1733 FF_DISABLE_DEPRECATION_WARNINGS
1734         // If 1, we memcpy blocks in xvmcvideo.
1735         if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
1736             ff_xvmc_init_block(s); // set s->block
1737 FF_ENABLE_DEPRECATION_WARNINGS
1738 #endif /* FF_API_XVMC */
1739
1740         if (mpeg_decode_mb(s, s->block) < 0)
1741             return -1;
1742
1743         if (s->current_picture.motion_val[0] && !s->encoding) { // note motion_val is normally NULL unless we want to extract the MVs
1744             const int wrap = s->b8_stride;
1745             int xy         = s->mb_x * 2 + s->mb_y * 2 * wrap;
1746             int b8_xy      = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1747             int motion_x, motion_y, dir, i;
1748
1749             for (i = 0; i < 2; i++) {
1750                 for (dir = 0; dir < 2; dir++) {
1751                     if (s->mb_intra || (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1752                         motion_x = motion_y = 0;
1753                     } else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1754                         motion_x = s->mv[dir][0][0];
1755                         motion_y = s->mv[dir][0][1];
1756                     } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
1757                         motion_x = s->mv[dir][i][0];
1758                         motion_y = s->mv[dir][i][1];
1759                     }
1760
1761                     s->current_picture.motion_val[dir][xy    ][0] = motion_x;
1762                     s->current_picture.motion_val[dir][xy    ][1] = motion_y;
1763                     s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1764                     s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1765                     s->current_picture.ref_index [dir][b8_xy    ] =
1766                     s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1767                     av_assert2(s->field_select[dir][i] == 0 || s->field_select[dir][i] == 1);
1768                 }
1769                 xy += wrap;
1770                 b8_xy +=2;
1771             }
1772         }
1773
1774         s->dest[0] += 16 >> lowres;
1775         s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1776         s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1777
1778         ff_MPV_decode_mb(s, s->block);
1779
1780         if (++s->mb_x >= s->mb_width) {
1781             const int mb_size = 16 >> s->avctx->lowres;
1782
1783             ff_mpeg_draw_horiz_band(s, mb_size*(s->mb_y >> field_pic), mb_size);
1784             ff_MPV_report_decode_progress(s);
1785
1786             s->mb_x = 0;
1787             s->mb_y += 1 << field_pic;
1788
1789             if (s->mb_y >= s->mb_height) {
1790                 int left   = get_bits_left(&s->gb);
1791                 int is_d10 = s->chroma_format == 2 && s->pict_type == AV_PICTURE_TYPE_I && avctx->profile == 0 && avctx->level == 5
1792                              && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
1793                              && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
1794
1795                 if (left >= 32 && !is_d10) {
1796                     GetBitContext gb = s->gb;
1797                     align_get_bits(&gb);
1798                     if (show_bits(&gb, 24) == 0x060E2B) {
1799                         av_log(avctx, AV_LOG_DEBUG, "Invalid MXF data found in video stream\n");
1800                         is_d10 = 1;
1801                     }
1802                 }
1803
1804                 if (left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
1805                     || ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
1806                     av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
1807                     return -1;
1808                 } else
1809                     goto eos;
1810             }
1811
1812             ff_init_block_index(s);
1813         }
1814
1815         /* skip mb handling */
1816         if (s->mb_skip_run == -1) {
1817             /* read increment again */
1818             s->mb_skip_run = 0;
1819             for (;;) {
1820                 int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1821                                     MBINCR_VLC_BITS, 2);
1822                 if (code < 0) {
1823                     av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1824                     return -1;
1825                 }
1826                 if (code >= 33) {
1827                     if (code == 33) {
1828                         s->mb_skip_run += 33;
1829                     } else if (code == 35) {
1830                         if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1831                             av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1832                             return -1;
1833                         }
1834                         goto eos; /* end of slice */
1835                     }
1836                     /* otherwise, stuffing, nothing to do */
1837                 } else {
1838                     s->mb_skip_run += code;
1839                     break;
1840                 }
1841             }
1842             if (s->mb_skip_run) {
1843                 int i;
1844                 if (s->pict_type == AV_PICTURE_TYPE_I) {
1845                     av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1846                     return -1;
1847                 }
1848
1849                 /* skip mb */
1850                 s->mb_intra = 0;
1851                 for (i = 0; i < 12; i++)
1852                     s->block_last_index[i] = -1;
1853                 if (s->picture_structure == PICT_FRAME)
1854                     s->mv_type = MV_TYPE_16X16;
1855                 else
1856                     s->mv_type = MV_TYPE_FIELD;
1857                 if (s->pict_type == AV_PICTURE_TYPE_P) {
1858                     /* if P type, zero motion vector is implied */
1859                     s->mv_dir             = MV_DIR_FORWARD;
1860                     s->mv[0][0][0]        = s->mv[0][0][1]      = 0;
1861                     s->last_mv[0][0][0]   = s->last_mv[0][0][1] = 0;
1862                     s->last_mv[0][1][0]   = s->last_mv[0][1][1] = 0;
1863                     s->field_select[0][0] = (s->picture_structure - 1) & 1;
1864                 } else {
1865                     /* if B type, reuse previous vectors and directions */
1866                     s->mv[0][0][0] = s->last_mv[0][0][0];
1867                     s->mv[0][0][1] = s->last_mv[0][0][1];
1868                     s->mv[1][0][0] = s->last_mv[1][0][0];
1869                     s->mv[1][0][1] = s->last_mv[1][0][1];
1870                 }
1871             }
1872         }
1873     }
1874 eos: // end of slice
1875     *buf += (get_bits_count(&s->gb)-1)/8;
1876     av_dlog(s, "y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1877     return 0;
1878 }
1879
1880 static int slice_decode_thread(AVCodecContext *c, void *arg)
1881 {
1882     MpegEncContext *s   = *(void**)arg;
1883     const uint8_t *buf  = s->gb.buffer;
1884     int mb_y            = s->start_mb_y;
1885     const int field_pic = s->picture_structure != PICT_FRAME;
1886
1887     s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
1888
1889     for (;;) {
1890         uint32_t start_code;
1891         int ret;
1892
1893         ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
1894         emms_c();
1895         av_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1896                 ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
1897                 s->start_mb_y, s->end_mb_y, s->er.error_count);
1898         if (ret < 0) {
1899             if (c->err_recognition & AV_EF_EXPLODE)
1900                 return ret;
1901             if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
1902                 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
1903         } else {
1904             ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_AC_END | ER_DC_END | ER_MV_END);
1905         }
1906
1907         if (s->mb_y == s->end_mb_y)
1908             return 0;
1909
1910         start_code = -1;
1911         buf = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
1912         mb_y= start_code - SLICE_MIN_START_CODE;
1913         if(s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1914             mb_y += (*buf&0xE0)<<2;
1915         mb_y <<= field_pic;
1916         if (s->picture_structure == PICT_BOTTOM_FIELD)
1917             mb_y++;
1918         if (mb_y < 0 || mb_y >= s->end_mb_y)
1919             return -1;
1920     }
1921 }
1922
1923 /**
1924  * Handle slice ends.
1925  * @return 1 if it seems to be the last slice
1926  */
1927 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1928 {
1929     Mpeg1Context *s1 = avctx->priv_data;
1930     MpegEncContext *s = &s1->mpeg_enc_ctx;
1931
1932     if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1933         return 0;
1934
1935     if (s->avctx->hwaccel) {
1936         if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1937             av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode picture\n");
1938     }
1939
1940 #if FF_API_XVMC
1941 FF_DISABLE_DEPRECATION_WARNINGS
1942     if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1943         ff_xvmc_field_end(s);
1944 FF_ENABLE_DEPRECATION_WARNINGS
1945 #endif /* FF_API_XVMC */
1946
1947     /* end of slice reached */
1948     if (/*s->mb_y << field_pic == s->mb_height &&*/ !s->first_field && !s->first_slice) {
1949         /* end of image */
1950
1951         ff_er_frame_end(&s->er);
1952
1953         ff_MPV_frame_end(s);
1954
1955         if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
1956             int ret = av_frame_ref(pict, &s->current_picture_ptr->f);
1957             if (ret < 0)
1958                 return ret;
1959             ff_print_debug_info(s, s->current_picture_ptr, pict);
1960             ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG2);
1961         } else {
1962             if (avctx->active_thread_type & FF_THREAD_FRAME)
1963                 s->picture_number++;
1964             /* latency of 1 frame for I- and P-frames */
1965             /* XXX: use another variable than picture_number */
1966             if (s->last_picture_ptr != NULL) {
1967                 int ret = av_frame_ref(pict, &s->last_picture_ptr->f);
1968                 if (ret < 0)
1969                     return ret;
1970                 ff_print_debug_info(s, s->last_picture_ptr, pict);
1971                 ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG2);
1972             }
1973         }
1974
1975         return 1;
1976     } else {
1977         return 0;
1978     }
1979 }
1980
1981 static int mpeg1_decode_sequence(AVCodecContext *avctx,
1982                                  const uint8_t *buf, int buf_size)
1983 {
1984     Mpeg1Context *s1 = avctx->priv_data;
1985     MpegEncContext *s = &s1->mpeg_enc_ctx;
1986     int width, height;
1987     int i, v, j;
1988
1989     init_get_bits(&s->gb, buf, buf_size*8);
1990
1991     width  = get_bits(&s->gb, 12);
1992     height = get_bits(&s->gb, 12);
1993     if (width == 0 || height == 0) {
1994         av_log(avctx, AV_LOG_WARNING, "Invalid horizontal or vertical size "
1995                "value.\n");
1996         if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
1997             return AVERROR_INVALIDDATA;
1998     }
1999     s->aspect_ratio_info = get_bits(&s->gb, 4);
2000     if (s->aspect_ratio_info == 0) {
2001         av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2002         if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2003             return -1;
2004     }
2005     s->frame_rate_index = get_bits(&s->gb, 4);
2006     if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
2007         return -1;
2008     s->bit_rate = get_bits(&s->gb, 18) * 400;
2009     if (get_bits1(&s->gb) == 0) /* marker */
2010         return -1;
2011     s->width  = width;
2012     s->height = height;
2013
2014     s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2015     skip_bits(&s->gb, 1);
2016
2017     /* get matrix */
2018     if (get_bits1(&s->gb)) {
2019         load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2020     } else {
2021         for (i = 0; i < 64; i++) {
2022             j = s->dsp.idct_permutation[i];
2023             v = ff_mpeg1_default_intra_matrix[i];
2024             s->intra_matrix[j]        = v;
2025             s->chroma_intra_matrix[j] = v;
2026         }
2027     }
2028     if (get_bits1(&s->gb)) {
2029         load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2030     } else {
2031         for (i = 0; i < 64; i++) {
2032             int j = s->dsp.idct_permutation[i];
2033             v = ff_mpeg1_default_non_intra_matrix[i];
2034             s->inter_matrix[j]        = v;
2035             s->chroma_inter_matrix[j] = v;
2036         }
2037     }
2038
2039     if (show_bits(&s->gb, 23) != 0) {
2040         av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2041         return -1;
2042     }
2043
2044     /* we set MPEG-2 parameters so that it emulates MPEG-1 */
2045     s->progressive_sequence = 1;
2046     s->progressive_frame    = 1;
2047     s->picture_structure    = PICT_FRAME;
2048     s->first_field          = 0;
2049     s->frame_pred_frame_dct = 1;
2050     s->chroma_format        = 1;
2051     s->codec_id             = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2052     s->out_format           = FMT_MPEG1;
2053     s->swap_uv              = 0; // AFAIK VCR2 does not have SEQ_HEADER
2054     if (s->flags & CODEC_FLAG_LOW_DELAY)
2055         s->low_delay = 1;
2056
2057     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2058         av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2059                s->avctx->rc_buffer_size, s->bit_rate);
2060
2061     return 0;
2062 }
2063
2064 static int vcr2_init_sequence(AVCodecContext *avctx)
2065 {
2066     Mpeg1Context *s1 = avctx->priv_data;
2067     MpegEncContext *s = &s1->mpeg_enc_ctx;
2068     int i, v;
2069
2070     /* start new MPEG-1 context decoding */
2071     s->out_format = FMT_MPEG1;
2072     if (s1->mpeg_enc_ctx_allocated) {
2073         ff_MPV_common_end(s);
2074         s1->mpeg_enc_ctx_allocated = 0;
2075     }
2076     s->width  = avctx->coded_width;
2077     s->height = avctx->coded_height;
2078     avctx->has_b_frames = 0; // true?
2079     s->low_delay = 1;
2080
2081     avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2082     setup_hwaccel_for_pixfmt(avctx);
2083
2084     if (ff_MPV_common_init(s) < 0)
2085         return -1;
2086     s1->mpeg_enc_ctx_allocated = 1;
2087
2088     for (i = 0; i < 64; i++) {
2089         int j = s->dsp.idct_permutation[i];
2090         v = ff_mpeg1_default_intra_matrix[i];
2091         s->intra_matrix[j]        = v;
2092         s->chroma_intra_matrix[j] = v;
2093
2094         v = ff_mpeg1_default_non_intra_matrix[i];
2095         s->inter_matrix[j]        = v;
2096         s->chroma_inter_matrix[j] = v;
2097     }
2098
2099     s->progressive_sequence  = 1;
2100     s->progressive_frame     = 1;
2101     s->picture_structure     = PICT_FRAME;
2102     s->first_field           = 0;
2103     s->frame_pred_frame_dct  = 1;
2104     s->chroma_format         = 1;
2105     if (s->codec_tag == AV_RL32("BW10")) {
2106         s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2107     } else {
2108         s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
2109         s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
2110     }
2111     s1->save_width           = s->width;
2112     s1->save_height          = s->height;
2113     s1->save_progressive_seq = s->progressive_sequence;
2114     return 0;
2115 }
2116
2117
2118 static void mpeg_decode_user_data(AVCodecContext *avctx,
2119                                   const uint8_t *p, int buf_size)
2120 {
2121     Mpeg1Context *s = avctx->priv_data;
2122     const uint8_t *buf_end = p + buf_size;
2123
2124     if(buf_size > 29){
2125         int i;
2126         for(i=0; i<20; i++)
2127             if(!memcmp(p+i, "\0TMPGEXS\0", 9)){
2128                 s->tmpgexs= 1;
2129             }
2130
2131 /*        for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i<buf_size; i++){
2132             av_log(avctx, AV_LOG_ERROR, "%c", p[i]);
2133         }
2134             av_log(avctx, AV_LOG_ERROR, "\n");*/
2135     }
2136
2137     /* we parse the DTG active format information */
2138     if (buf_end - p >= 5 &&
2139         p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2140         int flags = p[4];
2141         p += 5;
2142         if (flags & 0x80) {
2143             /* skip event id */
2144             p += 2;
2145         }
2146         if (flags & 0x40) {
2147             if (buf_end - p < 1)
2148                 return;
2149             avctx->dtg_active_format = p[0] & 0x0f;
2150         }
2151     }
2152 }
2153
2154 static void mpeg_decode_gop(AVCodecContext *avctx,
2155                             const uint8_t *buf, int buf_size)
2156 {
2157     Mpeg1Context *s1  = avctx->priv_data;
2158     MpegEncContext *s = &s1->mpeg_enc_ctx;
2159     int broken_link;
2160     int64_t tc;
2161
2162     init_get_bits(&s->gb, buf, buf_size*8);
2163
2164     tc = avctx->timecode_frame_start = get_bits(&s->gb, 25);
2165
2166     s->closed_gop = get_bits1(&s->gb);
2167     /*broken_link indicate that after editing the
2168       reference frames of the first B-Frames after GOP I-Frame
2169       are missing (open gop)*/
2170     broken_link = get_bits1(&s->gb);
2171
2172     if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2173         char tcbuf[AV_TIMECODE_STR_SIZE];
2174         av_timecode_make_mpeg_tc_string(tcbuf, tc);
2175         av_log(s->avctx, AV_LOG_DEBUG,
2176                "GOP (%s) closed_gop=%d broken_link=%d\n",
2177                tcbuf, s->closed_gop, broken_link);
2178     }
2179 }
2180
2181 static int decode_chunks(AVCodecContext *avctx,
2182                          AVFrame *picture, int *got_output,
2183                          const uint8_t *buf, int buf_size)
2184 {
2185     Mpeg1Context *s = avctx->priv_data;
2186     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2187     const uint8_t *buf_ptr = buf;
2188     const uint8_t *buf_end = buf + buf_size;
2189     int ret, input_size;
2190     int last_code = 0, skip_frame = 0;
2191     int picture_start_code_seen = 0;
2192
2193     for (;;) {
2194         /* find next start code */
2195         uint32_t start_code = -1;
2196         buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
2197         if (start_code > 0x1ff) {
2198             if (!skip_frame) {
2199                 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
2200                     !avctx->hwaccel) {
2201                     int i;
2202                     av_assert0(avctx->thread_count > 1);
2203
2204                     avctx->execute(avctx, slice_decode_thread,  &s2->thread_context[0], NULL, s->slice_count, sizeof(void*));
2205                     for (i = 0; i < s->slice_count; i++)
2206                         s2->er.error_count += s2->thread_context[i]->er.error_count;
2207                 }
2208
2209                 if ((CONFIG_MPEG_VDPAU_DECODER || CONFIG_MPEG1_VDPAU_DECODER)
2210                     && uses_vdpau(avctx))
2211                     ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2212
2213                 ret = slice_end(avctx, picture);
2214                 if (ret < 0)
2215                     return ret;
2216                 else if (ret) {
2217                     if (s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2218                         *got_output = 1;
2219                 }
2220             }
2221             s2->pict_type = 0;
2222
2223             if (avctx->err_recognition & AV_EF_EXPLODE && s2->er.error_count)
2224                 return AVERROR_INVALIDDATA;
2225
2226             return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2227         }
2228
2229         input_size = buf_end - buf_ptr;
2230
2231         if (avctx->debug & FF_DEBUG_STARTCODE) {
2232             av_log(avctx, AV_LOG_DEBUG, "%3X at %td left %d\n", start_code, buf_ptr-buf, input_size);
2233         }
2234
2235         /* prepare data for next start code */
2236         switch (start_code) {
2237         case SEQ_START_CODE:
2238             if (last_code == 0) {
2239                 mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2240                 if(buf != avctx->extradata)
2241                     s->sync=1;
2242             } else {
2243                 av_log(avctx, AV_LOG_ERROR, "ignoring SEQ_START_CODE after %X\n", last_code);
2244                 if (avctx->err_recognition & AV_EF_EXPLODE)
2245                     return AVERROR_INVALIDDATA;
2246             }
2247             break;
2248
2249         case PICTURE_START_CODE:
2250             if (picture_start_code_seen && s2->picture_structure == PICT_FRAME) {
2251                /* If it's a frame picture, there can't be more than one picture header.
2252                   Yet, it does happen and we need to handle it. */
2253                av_log(avctx, AV_LOG_WARNING, "ignoring extra picture following a frame-picture\n");
2254                break;
2255             }
2256             picture_start_code_seen = 1;
2257
2258             if (s2->width <= 0 || s2->height <= 0) {
2259                 av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
2260                        s2->width, s2->height);
2261                 return AVERROR_INVALIDDATA;
2262             }
2263
2264             if(s->tmpgexs){
2265                 s2->intra_dc_precision= 3;
2266                 s2->intra_matrix[0]= 1;
2267             }
2268             if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
2269                 !avctx->hwaccel && s->slice_count) {
2270                 int i;
2271
2272                 avctx->execute(avctx, slice_decode_thread,
2273                                s2->thread_context, NULL,
2274                                s->slice_count, sizeof(void*));
2275                 for (i = 0; i < s->slice_count; i++)
2276                     s2->er.error_count += s2->thread_context[i]->er.error_count;
2277                 s->slice_count = 0;
2278             }
2279             if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2280                 ret = mpeg_decode_postinit(avctx);
2281                 if (ret < 0) {
2282                     av_log(avctx, AV_LOG_ERROR, "mpeg_decode_postinit() failure\n");
2283                     return ret;
2284                 }
2285
2286                 /* we have a complete image: we try to decompress it */
2287                 if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2288                     s2->pict_type = 0;
2289                 s2->first_slice = 1;
2290                 last_code = PICTURE_START_CODE;
2291             } else {
2292                 av_log(avctx, AV_LOG_ERROR, "ignoring pic after %X\n", last_code);
2293                 if (avctx->err_recognition & AV_EF_EXPLODE)
2294                     return AVERROR_INVALIDDATA;
2295             }
2296             break;
2297         case EXT_START_CODE:
2298             init_get_bits(&s2->gb, buf_ptr, input_size*8);
2299
2300             switch (get_bits(&s2->gb, 4)) {
2301             case 0x1:
2302                 if (last_code == 0) {
2303                 mpeg_decode_sequence_extension(s);
2304                 } else {
2305                     av_log(avctx, AV_LOG_ERROR, "ignoring seq ext after %X\n", last_code);
2306                     if (avctx->err_recognition & AV_EF_EXPLODE)
2307                         return AVERROR_INVALIDDATA;
2308                 }
2309                 break;
2310             case 0x2:
2311                 mpeg_decode_sequence_display_extension(s);
2312                 break;
2313             case 0x3:
2314                 mpeg_decode_quant_matrix_extension(s2);
2315                 break;
2316             case 0x7:
2317                 mpeg_decode_picture_display_extension(s);
2318                 break;
2319             case 0x8:
2320                 if (last_code == PICTURE_START_CODE) {
2321                     mpeg_decode_picture_coding_extension(s);
2322                 } else {
2323                     av_log(avctx, AV_LOG_ERROR, "ignoring pic cod ext after %X\n", last_code);
2324                     if (avctx->err_recognition & AV_EF_EXPLODE)
2325                         return AVERROR_INVALIDDATA;
2326                 }
2327                 break;
2328             }
2329             break;
2330         case USER_START_CODE:
2331             mpeg_decode_user_data(avctx, buf_ptr, input_size);
2332             break;
2333         case GOP_START_CODE:
2334             if (last_code == 0) {
2335                 s2->first_field=0;
2336                 mpeg_decode_gop(avctx, buf_ptr, input_size);
2337                 s->sync=1;
2338             } else {
2339                 av_log(avctx, AV_LOG_ERROR, "ignoring GOP_START_CODE after %X\n", last_code);
2340                 if (avctx->err_recognition & AV_EF_EXPLODE)
2341                     return AVERROR_INVALIDDATA;
2342             }
2343             break;
2344         default:
2345             if (start_code >= SLICE_MIN_START_CODE &&
2346                 start_code <= SLICE_MAX_START_CODE && last_code == PICTURE_START_CODE) {
2347
2348                 if (s2->progressive_sequence && !s2->progressive_frame) {
2349                     s2->progressive_frame = 1;
2350                     av_log(s2->avctx, AV_LOG_ERROR, "interlaced frame in progressive sequence, ignoring\n");
2351                 }
2352
2353                 if (s2->picture_structure == 0 || (s2->progressive_frame && s2->picture_structure != PICT_FRAME)) {
2354                     av_log(s2->avctx, AV_LOG_ERROR, "picture_structure %d invalid, ignoring\n", s2->picture_structure);
2355                     s2->picture_structure = PICT_FRAME;
2356                 }
2357
2358                 if (s2->progressive_sequence && !s2->frame_pred_frame_dct) {
2359                     av_log(s2->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
2360                 }
2361
2362                 if (s2->picture_structure == PICT_FRAME) {
2363                     s2->first_field = 0;
2364                     s2->v_edge_pos  = 16 * s2->mb_height;
2365                 } else {
2366                     s2->first_field ^= 1;
2367                     s2->v_edge_pos   = 8 * s2->mb_height;
2368                     memset(s2->mbskip_table, 0, s2->mb_stride * s2->mb_height);
2369                 }
2370             }
2371             if (start_code >= SLICE_MIN_START_CODE &&
2372                 start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2373                 const int field_pic = s2->picture_structure != PICT_FRAME;
2374                 int mb_y = start_code - SLICE_MIN_START_CODE;
2375                 last_code = SLICE_MIN_START_CODE;
2376                 if(s2->codec_id != AV_CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
2377                     mb_y += (*buf_ptr&0xE0)<<2;
2378
2379                 mb_y <<= field_pic;
2380                 if (s2->picture_structure == PICT_BOTTOM_FIELD)
2381                     mb_y++;
2382
2383                 if (buf_end - buf_ptr < 2) {
2384                     av_log(s2->avctx, AV_LOG_ERROR, "slice too small\n");
2385                     return AVERROR_INVALIDDATA;
2386                 }
2387
2388                 if (mb_y >= s2->mb_height) {
2389                     av_log(s2->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2390                     return -1;
2391                 }
2392
2393                 if (s2->last_picture_ptr == NULL) {
2394                 /* Skip B-frames if we do not have reference frames and gop is not closed */
2395                     if (s2->pict_type == AV_PICTURE_TYPE_B) {
2396                         if (!s2->closed_gop) {
2397                             skip_frame = 1;
2398                             break;
2399                         }
2400                     }
2401                 }
2402                 if (s2->pict_type == AV_PICTURE_TYPE_I || (s2->flags2 & CODEC_FLAG2_SHOW_ALL))
2403                     s->sync=1;
2404                 if (s2->next_picture_ptr == NULL) {
2405                 /* Skip P-frames if we do not have a reference frame or we have an invalid header. */
2406                     if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
2407                         skip_frame = 1;
2408                         break;
2409                     }
2410                 }
2411                 if ((avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type == AV_PICTURE_TYPE_B) ||
2412                     (avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type != AV_PICTURE_TYPE_I) ||
2413                      avctx->skip_frame >= AVDISCARD_ALL) {
2414                     skip_frame = 1;
2415                     break;
2416                 }
2417
2418                 if (!s->mpeg_enc_ctx_allocated)
2419                     break;
2420
2421                 if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2422                     if (mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
2423                         break;
2424                 }
2425
2426                 if (!s2->pict_type) {
2427                     av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2428                     if (avctx->err_recognition & AV_EF_EXPLODE)
2429                         return AVERROR_INVALIDDATA;
2430                     break;
2431                 }
2432
2433                 if (s2->first_slice) {
2434                     skip_frame = 0;
2435                     s2->first_slice = 0;
2436                     if (mpeg_field_start(s2, buf, buf_size) < 0)
2437                         return -1;
2438                 }
2439                 if (!s2->current_picture_ptr) {
2440                     av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
2441                     return AVERROR_INVALIDDATA;
2442                 }
2443
2444                 if (uses_vdpau(avctx)) {
2445                     s->slice_count++;
2446                     break;
2447                 }
2448
2449                 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
2450                     !avctx->hwaccel) {
2451                     int threshold = (s2->mb_height * s->slice_count +
2452                                      s2->slice_context_count / 2) /
2453                                     s2->slice_context_count;
2454                     av_assert0(avctx->thread_count > 1);
2455                     if (threshold <= mb_y) {
2456                         MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2457
2458                         thread_context->start_mb_y = mb_y;
2459                         thread_context->end_mb_y   = s2->mb_height;
2460                         if (s->slice_count) {
2461                             s2->thread_context[s->slice_count-1]->end_mb_y = mb_y;
2462                             ret = ff_update_duplicate_context(thread_context,
2463                                                               s2);
2464                             if (ret < 0)
2465                                 return ret;
2466                         }
2467                         init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2468                         s->slice_count++;
2469                     }
2470                     buf_ptr += 2; // FIXME add minimum number of bytes per slice
2471                 } else {
2472                     ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2473                     emms_c();
2474
2475                     if (ret < 0) {
2476                         if (avctx->err_recognition & AV_EF_EXPLODE)
2477                             return ret;
2478                         if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2479                             ff_er_add_slice(&s2->er, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x, s2->mb_y, ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2480                     } else {
2481                         ff_er_add_slice(&s2->er, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x-1, s2->mb_y, ER_AC_END | ER_DC_END | ER_MV_END);
2482                     }
2483                 }
2484             }
2485             break;
2486         }
2487     }
2488 }
2489
2490 static int mpeg_decode_frame(AVCodecContext *avctx,
2491                              void *data, int *got_output,
2492                              AVPacket *avpkt)
2493 {
2494     const uint8_t *buf = avpkt->data;
2495     int ret;
2496     int buf_size = avpkt->size;
2497     Mpeg1Context *s = avctx->priv_data;
2498     AVFrame *picture = data;
2499     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2500     av_dlog(avctx, "fill_buffer\n");
2501
2502     if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2503         /* special case for last picture */
2504         if (s2->low_delay == 0 && s2->next_picture_ptr) {
2505             int ret = av_frame_ref(picture, &s2->next_picture_ptr->f);
2506             if (ret < 0)
2507                 return ret;
2508
2509             s2->next_picture_ptr = NULL;
2510
2511             *got_output = 1;
2512         }
2513         return buf_size;
2514     }
2515
2516     if (s2->flags & CODEC_FLAG_TRUNCATED) {
2517         int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size, NULL);
2518
2519         if (ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0)
2520             return buf_size;
2521     }
2522
2523     s2->codec_tag = avpriv_toupper4(avctx->codec_tag);
2524     if (s->mpeg_enc_ctx_allocated == 0 && (   s2->codec_tag == AV_RL32("VCR2")
2525                                            || s2->codec_tag == AV_RL32("BW10")
2526                                           ))
2527         vcr2_init_sequence(avctx);
2528
2529     s->slice_count = 0;
2530
2531     if (avctx->extradata && !s->extradata_decoded) {
2532         ret = decode_chunks(avctx, picture, got_output, avctx->extradata, avctx->extradata_size);
2533         if(*got_output) {
2534             av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
2535             *got_output = 0;
2536         }
2537         s->extradata_decoded = 1;
2538         if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) {
2539             s2->current_picture_ptr = NULL;
2540             return ret;
2541         }
2542     }
2543
2544     ret = decode_chunks(avctx, picture, got_output, buf, buf_size);
2545     if (ret<0 || *got_output)
2546         s2->current_picture_ptr = NULL;
2547
2548     return ret;
2549 }
2550
2551
2552 static void flush(AVCodecContext *avctx)
2553 {
2554     Mpeg1Context *s = avctx->priv_data;
2555
2556     s->sync=0;
2557
2558     ff_mpeg_flush(avctx);
2559 }
2560
2561 static av_cold int mpeg_decode_end(AVCodecContext *avctx)
2562 {
2563     Mpeg1Context *s = avctx->priv_data;
2564
2565     if (s->mpeg_enc_ctx_allocated)
2566         ff_MPV_common_end(&s->mpeg_enc_ctx);
2567     return 0;
2568 }
2569
2570 static const AVProfile mpeg2_video_profiles[] = {
2571     { FF_PROFILE_MPEG2_422,          "4:2:2"              },
2572     { FF_PROFILE_MPEG2_HIGH,         "High"               },
2573     { FF_PROFILE_MPEG2_SS,           "Spatially Scalable" },
2574     { FF_PROFILE_MPEG2_SNR_SCALABLE, "SNR Scalable"       },
2575     { FF_PROFILE_MPEG2_MAIN,         "Main"               },
2576     { FF_PROFILE_MPEG2_SIMPLE,       "Simple"             },
2577     { FF_PROFILE_RESERVED,           "Reserved"           },
2578     { FF_PROFILE_RESERVED,           "Reserved"           },
2579     { FF_PROFILE_UNKNOWN },
2580 };
2581
2582
2583 AVCodec ff_mpeg1video_decoder = {
2584     .name                  = "mpeg1video",
2585     .long_name             = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2586     .type                  = AVMEDIA_TYPE_VIDEO,
2587     .id                    = AV_CODEC_ID_MPEG1VIDEO,
2588     .priv_data_size        = sizeof(Mpeg1Context),
2589     .init                  = mpeg_decode_init,
2590     .close                 = mpeg_decode_end,
2591     .decode                = mpeg_decode_frame,
2592     .capabilities          = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2593                              CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2594                              CODEC_CAP_SLICE_THREADS,
2595     .flush                 = flush,
2596     .max_lowres            = 3,
2597     .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context)
2598 };
2599
2600 AVCodec ff_mpeg2video_decoder = {
2601     .name           = "mpeg2video",
2602     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2603     .type           = AVMEDIA_TYPE_VIDEO,
2604     .id             = AV_CODEC_ID_MPEG2VIDEO,
2605     .priv_data_size = sizeof(Mpeg1Context),
2606     .init           = mpeg_decode_init,
2607     .close          = mpeg_decode_end,
2608     .decode         = mpeg_decode_frame,
2609     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2610                       CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2611                       CODEC_CAP_SLICE_THREADS,
2612     .flush          = flush,
2613     .max_lowres     = 3,
2614     .profiles       = NULL_IF_CONFIG_SMALL(mpeg2_video_profiles),
2615 };
2616
2617 //legacy decoder
2618 AVCodec ff_mpegvideo_decoder = {
2619     .name           = "mpegvideo",
2620     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2621     .type           = AVMEDIA_TYPE_VIDEO,
2622     .id             = AV_CODEC_ID_MPEG2VIDEO,
2623     .priv_data_size = sizeof(Mpeg1Context),
2624     .init           = mpeg_decode_init,
2625     .close          = mpeg_decode_end,
2626     .decode         = mpeg_decode_frame,
2627     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
2628     .flush          = flush,
2629     .max_lowres     = 3,
2630 };
2631
2632 #if FF_API_XVMC
2633 #if CONFIG_MPEG_XVMC_DECODER
2634 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx)
2635 {
2636     if (avctx->active_thread_type & FF_THREAD_SLICE)
2637         return -1;
2638     if (!(avctx->slice_flags & SLICE_FLAG_CODED_ORDER))
2639         return -1;
2640     if (!(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
2641         av_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2642     }
2643     mpeg_decode_init(avctx);
2644
2645     avctx->pix_fmt           = AV_PIX_FMT_XVMC_MPEG2_IDCT;
2646     avctx->xvmc_acceleration = 2; // 2 - the blocks are packed!
2647
2648     return 0;
2649 }
2650
2651 AVCodec ff_mpeg_xvmc_decoder = {
2652     .name           = "mpegvideo_xvmc",
2653     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2654     .type           = AVMEDIA_TYPE_VIDEO,
2655     .id             = AV_CODEC_ID_MPEG2VIDEO_XVMC,
2656     .priv_data_size = sizeof(Mpeg1Context),
2657     .init           = mpeg_mc_decode_init,
2658     .close          = mpeg_decode_end,
2659     .decode         = mpeg_decode_frame,
2660     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2661                       CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2662     .flush          = flush,
2663 };
2664
2665 #endif
2666 #endif /* FF_API_XVMC */
2667
2668 #if CONFIG_MPEG_VDPAU_DECODER
2669 AVCodec ff_mpeg_vdpau_decoder = {
2670     .name           = "mpegvideo_vdpau",
2671     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2672     .type           = AVMEDIA_TYPE_VIDEO,
2673     .id             = AV_CODEC_ID_MPEG2VIDEO,
2674     .priv_data_size = sizeof(Mpeg1Context),
2675     .init           = mpeg_decode_init,
2676     .close          = mpeg_decode_end,
2677     .decode         = mpeg_decode_frame,
2678     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2679                       CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2680     .flush          = flush,
2681 };
2682 #endif
2683
2684 #if CONFIG_MPEG1_VDPAU_DECODER
2685 AVCodec ff_mpeg1_vdpau_decoder = {
2686     .name           = "mpeg1video_vdpau",
2687     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
2688     .type           = AVMEDIA_TYPE_VIDEO,
2689     .id             = AV_CODEC_ID_MPEG1VIDEO,
2690     .priv_data_size = sizeof(Mpeg1Context),
2691     .init           = mpeg_decode_init,
2692     .close          = mpeg_decode_end,
2693     .decode         = mpeg_decode_frame,
2694     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2695                       CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2696     .flush          = flush,
2697 };
2698 #endif