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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 "mpeg12decdata.h"
  38 #include "bytestream.h"
  39 #include "vdpau_internal.h"
  40 #include "xvmc_internal.h"
  41 #include "thread.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 swap_uv;//indicate VCR2
  50     int save_aspect_info;
  51     int save_width, save_height, save_progressive_seq;
  52     AVRational frame_rate_ext;       ///< MPEG-2 specific framerate modificator
  53     int sync;                        ///< Did we reach a sync point like a GOP/SEQ/KEYFrame?
  54     int tmpgexs;
  55     int extradata_decoded;
  56 } Mpeg1Context;
  57
  58 /* as H.263, but only 17 codes */
  59 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
  60 {
  61     int code, sign, val, shift;
  62
  63     code = get_vlc2(&s->gb, ff_mv_vlc.table, MV_VLC_BITS, 2);
  64     if (code == 0) {
  65         return pred;
  66     }
  67     if (code < 0) {
  68         return 0xffff;
  69     }
  70
  71     sign  = get_bits1(&s->gb);
  72     shift = fcode - 1;
  73     val   = code;
  74     if (shift) {
  75         val  = (val - 1) << shift;
  76         val |= get_bits(&s->gb, shift);
  77         val++;
  78     }
  79     if (sign)
  80         val = -val;
  81     val += pred;
  82
  83     /* modulo decoding */
  84     return sign_extend(val, 5 + shift);
  85 }
  86
  87 static inline int mpeg1_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
  88 {
  89     int level, dc, diff, i, j, run;
  90     int component;
  91     RLTable *rl = &ff_rl_mpeg1;
  92     uint8_t * const scantable    = s->intra_scantable.permutated;
  93     const uint16_t *quant_matrix = s->intra_matrix;
  94     const int qscale             = s->qscale;
  95
  96     /* DC coefficient */
  97     component = (n <= 3 ? 0 : n - 4 + 1);
  98     diff = decode_dc(&s->gb, component);
  99     if (diff >= 0xffff)
 100         return -1;
 101     dc  = s->last_dc[component];
 102     dc += diff;
 103     s->last_dc[component] = dc;
 104     block[0] = dc * quant_matrix[0];
 105     av_dlog(s->avctx, "dc=%d diff=%d\n", dc, diff);
 106     i = 0;
 107     {
 108         OPEN_READER(re, &s->gb);
 109         /* now quantify & encode AC coefficients */
 110         for (;;) {
 111             UPDATE_CACHE(re, &s->gb);
 112             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
 113
 114             if (level == 127) {
 115                 break;
 116             } else if (level != 0) {
 117                 i += run;
 118                 j = scantable[i];
 119                 level = (level * qscale * quant_matrix[j]) >> 4;
 120                 level = (level - 1) | 1;
 121                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
 122                 LAST_SKIP_BITS(re, &s->gb, 1);
 123             } else {
 124                 /* escape */
 125                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
 126                 UPDATE_CACHE(re, &s->gb);
 127                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
 128                 if (level == -128) {
 129                     level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
 130                 } else if (level == 0) {
 131                     level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
 132                 }
 133                 i += run;
 134                 j = scantable[i];
 135                 if (level < 0) {
 136                     level = -level;
 137                     level = (level * qscale * quant_matrix[j]) >> 4;
 138                     level = (level - 1) | 1;
 139                     level = -level;
 140                 } else {
 141                     level = (level * qscale * quant_matrix[j]) >> 4;
 142                     level = (level - 1) | 1;
 143                 }
 144             }
 145             if (i > 63) {
 146                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
 147                 return -1;
 148             }
 149
 150             block[j] = level;
 151         }
 152         CLOSE_READER(re, &s->gb);
 153     }
 154     s->block_last_index[n] = i;
 155    return 0;
 156 }
 157
 158 int ff_mpeg1_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
 159 {
 160     return mpeg1_decode_block_intra(s, block, n);
 161 }
 162
 163 static inline int mpeg1_decode_block_inter(MpegEncContext *s, int16_t *block, int n)
 164 {
 165     int level, i, j, run;
 166     RLTable *rl = &ff_rl_mpeg1;
 167     uint8_t * const scantable    = s->intra_scantable.permutated;
 168     const uint16_t *quant_matrix = s->inter_matrix;
 169     const int qscale             = s->qscale;
 170
 171     {
 172         OPEN_READER(re, &s->gb);
 173         i = -1;
 174         // special case for first coefficient, no need to add second VLC table
 175         UPDATE_CACHE(re, &s->gb);
 176         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
 177             level = (3 * qscale * quant_matrix[0]) >> 5;
 178             level = (level - 1) | 1;
 179             if (GET_CACHE(re, &s->gb) & 0x40000000)
 180                 level = -level;
 181             block[0] = level;
 182             i++;
 183             SKIP_BITS(re, &s->gb, 2);
 184             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
 185                 goto end;
 186         }
 187         /* now quantify & encode AC coefficients */
 188         for (;;) {
 189             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
 190
 191             if (level != 0) {
 192                 i += run;
 193                 j = scantable[i];
 194                 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 195                 level = (level - 1) | 1;
 196                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
 197                 SKIP_BITS(re, &s->gb, 1);
 198             } else {
 199                 /* escape */
 200                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
 201                 UPDATE_CACHE(re, &s->gb);
 202                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
 203                 if (level == -128) {
 204                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
 205                 } else if (level == 0) {
 206                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
 207                 }
 208                 i += run;
 209                 j = scantable[i];
 210                 if (level < 0) {
 211                     level = -level;
 212                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 213                     level = (level - 1) | 1;
 214                     level = -level;
 215                 } else {
 216                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 217                     level = (level - 1) | 1;
 218                 }
 219             }
 220             if (i > 63) {
 221                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
 222                 return -1;
 223             }
 224
 225             block[j] = level;
 226             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
 227                 break;
 228             UPDATE_CACHE(re, &s->gb);
 229         }
 230 end:
 231         LAST_SKIP_BITS(re, &s->gb, 2);
 232         CLOSE_READER(re, &s->gb);
 233     }
 234     s->block_last_index[n] = i;
 235     return 0;
 236 }
 237
 238 /**
 239  * Note: this function can read out of range and crash for corrupt streams.
 240  * Changing this would eat up any speed benefits it has.
 241  * Do not use "fast" flag if you need the code to be robust.
 242  */
 243 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, int16_t *block, int n)
 244 {
 245     int level, i, j, run;
 246     RLTable *rl = &ff_rl_mpeg1;
 247     uint8_t * const scantable = s->intra_scantable.permutated;
 248     const int qscale          = s->qscale;
 249
 250     {
 251         OPEN_READER(re, &s->gb);
 252         i = -1;
 253         // special case for first coefficient, no need to add second VLC table
 254         UPDATE_CACHE(re, &s->gb);
 255         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
 256             level = (3 * qscale) >> 1;
 257             level = (level - 1) | 1;
 258             if (GET_CACHE(re, &s->gb) & 0x40000000)
 259                 level = -level;
 260             block[0] = level;
 261             i++;
 262             SKIP_BITS(re, &s->gb, 2);
 263             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
 264                 goto end;
 265         }
 266
 267         /* now quantify & encode AC coefficients */
 268         for (;;) {
 269             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
 270
 271             if (level != 0) {
 272                 i += run;
 273                 j = scantable[i];
 274                 level = ((level * 2 + 1) * qscale) >> 1;
 275                 level = (level - 1) | 1;
 276                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
 277                 SKIP_BITS(re, &s->gb, 1);
 278             } else {
 279                 /* escape */
 280                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
 281                 UPDATE_CACHE(re, &s->gb);
 282                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
 283                 if (level == -128) {
 284                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
 285                 } else if (level == 0) {
 286                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
 287                 }
 288                 i += run;
 289                 j = scantable[i];
 290                 if (level < 0) {
 291                     level = -level;
 292                     level = ((level * 2 + 1) * qscale) >> 1;
 293                     level = (level - 1) | 1;
 294                     level = -level;
 295                 } else {
 296                     level = ((level * 2 + 1) * qscale) >> 1;
 297                     level = (level - 1) | 1;
 298                 }
 299             }
 300
 301             block[j] = level;
 302             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
 303                 break;
 304             UPDATE_CACHE(re, &s->gb);
 305         }
 306 end:
 307         LAST_SKIP_BITS(re, &s->gb, 2);
 308         CLOSE_READER(re, &s->gb);
 309     }
 310     s->block_last_index[n] = i;
 311     return 0;
 312 }
 313
 314
 315 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s, int16_t *block, int n)
 316 {
 317     int level, i, j, run;
 318     RLTable *rl = &ff_rl_mpeg1;
 319     uint8_t * const scantable = s->intra_scantable.permutated;
 320     const uint16_t *quant_matrix;
 321     const int qscale = s->qscale;
 322     int mismatch;
 323
 324     mismatch = 1;
 325
 326     {
 327         OPEN_READER(re, &s->gb);
 328         i = -1;
 329         if (n < 4)
 330             quant_matrix = s->inter_matrix;
 331         else
 332             quant_matrix = s->chroma_inter_matrix;
 333
 334         // special case for first coefficient, no need to add second VLC table
 335         UPDATE_CACHE(re, &s->gb);
 336         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
 337             level= (3 * qscale * quant_matrix[0]) >> 5;
 338             if (GET_CACHE(re, &s->gb) & 0x40000000)
 339                 level = -level;
 340             block[0]  = level;
 341             mismatch ^= level;
 342             i++;
 343             SKIP_BITS(re, &s->gb, 2);
 344             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
 345                 goto end;
 346         }
 347
 348         /* now quantify & encode AC coefficients */
 349         for (;;) {
 350             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
 351
 352             if (level != 0) {
 353                 i += run;
 354                 j = scantable[i];
 355                 level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 356                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
 357                 SKIP_BITS(re, &s->gb, 1);
 358             } else {
 359                 /* escape */
 360                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
 361                 UPDATE_CACHE(re, &s->gb);
 362                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
 363
 364                 i += run;
 365                 j = scantable[i];
 366                 if (level < 0) {
 367                     level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 368                     level = -level;
 369                 } else {
 370                     level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
 371                 }
 372             }
 373             if (i > 63) {
 374                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
 375                 return -1;
 376             }
 377
 378             mismatch ^= level;
 379             block[j]  = level;
 380             if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
 381                 break;
 382             UPDATE_CACHE(re, &s->gb);
 383         }
 384 end:
 385         LAST_SKIP_BITS(re, &s->gb, 2);
 386         CLOSE_READER(re, &s->gb);
 387     }
 388     block[63] ^= (mismatch & 1);
 389
 390     s->block_last_index[n] = i;
 391     return 0;
 392 }
 393
 394 /**
 395  * Note: this function can read out of range and crash for corrupt streams.
 396  * Changing this would eat up any speed benefits it has.
 397  * Do not use "fast" flag if you need the code to be robust.
 398  */
 399 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
 400                                                     int16_t *block, int n)
 401 {
 402     int level, i, j, run;
 403     RLTable *rl = &ff_rl_mpeg1;
 404     uint8_t * const scantable = s->intra_scantable.permutated;
 405     const int qscale          = s->qscale;
 406     OPEN_READER(re, &s->gb);
 407     i = -1;
 408
 409     // special case for first coefficient, no need to add second VLC table
 410     UPDATE_CACHE(re, &s->gb);
 411     if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
 412         level = (3 * qscale) >> 1;
 413         if (GET_CACHE(re, &s->gb) & 0x40000000)
 414             level = -level;
 415         block[0] = level;
 416         i++;
 417         SKIP_BITS(re, &s->gb, 2);
 418         if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
 419             goto end;
 420     }
 421
 422     /* now quantify & encode AC coefficients */
 423     for (;;) {
 424         GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
 425
 426         if (level != 0) {
 427             i += run;
 428             j  = scantable[i];
 429             level = ((level * 2 + 1) * qscale) >> 1;
 430             level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
 431             SKIP_BITS(re, &s->gb, 1);
 432         } else {
 433             /* escape */
 434             run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
 435             UPDATE_CACHE(re, &s->gb);
 436             level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
 437
 438             i += run;
 439             j  = scantable[i];
 440             if (level < 0) {
 441                 level = ((-level * 2 + 1) * qscale) >> 1;
 442                 level = -level;
 443             } else {
 444                 level = ((level * 2 + 1) * qscale) >> 1;
 445             }
 446         }
 447
 448         block[j] = level;
 449         if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
 450             break;
 451         UPDATE_CACHE(re, &s->gb);
 452     }
 453 end:
 454     LAST_SKIP_BITS(re, &s->gb, 2);
 455     CLOSE_READER(re, &s->gb);
 456     s->block_last_index[n] = i;
 457     return 0;
 458 }
 459
 460
 461 static inline int mpeg2_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
 462 {
 463     int level, dc, diff, i, j, run;
 464     int component;
 465     RLTable *rl;
 466     uint8_t * const scantable = s->intra_scantable.permutated;
 467     const uint16_t *quant_matrix;
 468     const int qscale = s->qscale;
 469     int mismatch;
 470
 471     /* DC coefficient */
 472     if (n < 4) {
 473         quant_matrix = s->intra_matrix;
 474         component = 0;
 475     } else {
 476         quant_matrix = s->chroma_intra_matrix;
 477         component = (n & 1) + 1;
 478     }
 479     diff = decode_dc(&s->gb, component);
 480     if (diff >= 0xffff)
 481         return -1;
 482     dc  = s->last_dc[component];
 483     dc += diff;
 484     s->last_dc[component] = dc;
 485     block[0] = dc << (3 - s->intra_dc_precision);
 486     av_dlog(s->avctx, "dc=%d\n", block[0]);
 487     mismatch = block[0] ^ 1;
 488     i = 0;
 489     if (s->intra_vlc_format)
 490         rl = &ff_rl_mpeg2;
 491     else
 492         rl = &ff_rl_mpeg1;
 493
 494     {
 495         OPEN_READER(re, &s->gb);
 496         /* now quantify & encode AC coefficients */
 497         for (;;) {
 498             UPDATE_CACHE(re, &s->gb);
 499             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
 500
 501             if (level == 127) {
 502                 break;
 503             } else if (level != 0) {
 504                 i += run;
 505                 j  = scantable[i];
 506                 level = (level * qscale * quant_matrix[j]) >> 4;
 507                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
 508                 LAST_SKIP_BITS(re, &s->gb, 1);
 509             } else {
 510                 /* escape */
 511                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
 512                 UPDATE_CACHE(re, &s->gb);
 513                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
 514                 i += run;
 515                 j  = scantable[i];
 516                 if (level < 0) {
 517                     level = (-level * qscale * quant_matrix[j]) >> 4;
 518                     level = -level;
 519                 } else {
 520                     level = (level * qscale * quant_matrix[j]) >> 4;
 521                 }
 522             }
 523             if (i > 63) {
 524                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
 525                 return -1;
 526             }
 527
 528             mismatch ^= level;
 529             block[j]  = level;
 530         }
 531         CLOSE_READER(re, &s->gb);
 532     }
 533     block[63] ^= mismatch & 1;
 534
 535     s->block_last_index[n] = i;
 536     return 0;
 537 }
 538
 539 /**
 540  * Note: this function can read out of range and crash for corrupt streams.
 541  * Changing this would eat up any speed benefits it has.
 542  * Do not use "fast" flag if you need the code to be robust.
 543  */
 544 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
 545 {
 546     int level, dc, diff, j, run;
 547     int component;
 548     RLTable *rl;
 549     uint8_t * scantable = s->intra_scantable.permutated;
 550     const uint16_t *quant_matrix;
 551     const int qscale = s->qscale;
 552
 553     /* DC coefficient */
 554     if (n < 4) {
 555         quant_matrix = s->intra_matrix;
 556         component = 0;
 557     } else {
 558         quant_matrix = s->chroma_intra_matrix;
 559         component = (n & 1) + 1;
 560     }
 561     diff = decode_dc(&s->gb, component);
 562     if (diff >= 0xffff)
 563         return -1;
 564     dc = s->last_dc[component];
 565     dc += diff;
 566     s->last_dc[component] = dc;
 567     block[0] = dc << (3 - s->intra_dc_precision);
 568     if (s->intra_vlc_format)
 569         rl = &ff_rl_mpeg2;
 570     else
 571         rl = &ff_rl_mpeg1;
 572
 573     {
 574         OPEN_READER(re, &s->gb);
 575         /* now quantify & encode AC coefficients */
 576         for (;;) {
 577             UPDATE_CACHE(re, &s->gb);
 578             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
 579
 580             if (level == 127) {
 581                 break;
 582             } else if (level != 0) {
 583                 scantable += run;
 584                 j = *scantable;
 585                 level = (level * qscale * quant_matrix[j]) >> 4;
 586                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
 587                 LAST_SKIP_BITS(re, &s->gb, 1);
 588             } else {
 589                 /* escape */
 590                 run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
 591                 UPDATE_CACHE(re, &s->gb);
 592                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
 593                 scantable += run;
 594                 j = *scantable;
 595                 if (level < 0) {
 596                     level = (-level * qscale * quant_matrix[j]) >> 4;
 597                     level = -level;
 598                 } else {
 599                     level = (level * qscale * quant_matrix[j]) >> 4;
 600                 }
 601             }
 602
 603             block[j] = level;
 604         }
 605         CLOSE_READER(re, &s->gb);
 606     }
 607
 608     s->block_last_index[n] = scantable - s->intra_scantable.permutated;
 609     return 0;
 610 }
 611
 612 /******************************************/
 613 /* decoding */
 614
 615 static inline int get_dmv(MpegEncContext *s)
 616 {
 617     if (get_bits1(&s->gb))
 618         return 1 - (get_bits1(&s->gb) << 1);
 619     else
 620         return 0;
 621 }
 622
 623 static inline int get_qscale(MpegEncContext *s)
 624 {
 625     int qscale = get_bits(&s->gb, 5);
 626     if (s->q_scale_type) {
 627         return non_linear_qscale[qscale];
 628     } else {
 629         return qscale << 1;
 630     }
 631 }
 632
 633 static void exchange_uv(MpegEncContext *s)
 634 {
 635     int16_t (*tmp)[64];
 636
 637     tmp           = s->pblocks[4];
 638     s->pblocks[4] = s->pblocks[5];
 639     s->pblocks[5] = tmp;
 640 }
 641
 642 /* motion type (for MPEG-2) */
 643 #define MT_FIELD 1
 644 #define MT_FRAME 2
 645 #define MT_16X8  2
 646 #define MT_DMV   3
 647
 648 static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
 649 {
 650     int i, j, k, cbp, val, mb_type, motion_type;
 651     const int mb_block_count = 4 + (1 << s->chroma_format);
 652
 653     av_dlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
 654
 655     av_assert2(s->mb_skipped == 0);
 656
 657     if (s->mb_skip_run-- != 0) {
 658         if (s->pict_type == AV_PICTURE_TYPE_P) {
 659             s->mb_skipped = 1;
 660             s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
 661         } else {
 662             int mb_type;
 663
 664             if (s->mb_x)
 665                 mb_type = s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
 666             else
 667                 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
 668             if (IS_INTRA(mb_type)) {
 669                 av_log(s->avctx, AV_LOG_ERROR, "skip with previntra\n");
 670                 return -1;
 671             }
 672             s->current_picture.mb_type[s->mb_x + s->mb_y*s->mb_stride] =
 673                 mb_type | MB_TYPE_SKIP;
 674
 675 //            assert(s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1] & (MB_TYPE_16x16 | MB_TYPE_16x8));
 676
 677             if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
 678                 s->mb_skipped = 1;
 679         }
 680
 681         return 0;
 682     }
 683
 684     switch (s->pict_type) {
 685     default:
 686     case AV_PICTURE_TYPE_I:
 687         if (get_bits1(&s->gb) == 0) {
 688             if (get_bits1(&s->gb) == 0) {
 689                 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
 690                 return -1;
 691             }
 692             mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
 693         } else {
 694             mb_type = MB_TYPE_INTRA;
 695         }
 696         break;
 697     case AV_PICTURE_TYPE_P:
 698         mb_type = get_vlc2(&s->gb, ff_mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
 699         if (mb_type < 0) {
 700             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
 701             return -1;
 702         }
 703         mb_type = ptype2mb_type[mb_type];
 704         break;
 705     case AV_PICTURE_TYPE_B:
 706         mb_type = get_vlc2(&s->gb, ff_mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
 707         if (mb_type < 0) {
 708             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
 709             return -1;
 710         }
 711         mb_type = btype2mb_type[mb_type];
 712         break;
 713     }
 714     av_dlog(s->avctx, "mb_type=%x\n", mb_type);
 715 //    motion_type = 0; /* avoid warning */
 716     if (IS_INTRA(mb_type)) {
 717         s->dsp.clear_blocks(s->block[0]);
 718
 719         if (!s->chroma_y_shift) {
 720             s->dsp.clear_blocks(s->block[6]);
 721         }
 722
 723         /* compute DCT type */
 724         if (s->picture_structure == PICT_FRAME && // FIXME add an interlaced_dct coded var?
 725             !s->frame_pred_frame_dct) {
 726             s->interlaced_dct = get_bits1(&s->gb);
 727         }
 728
 729         if (IS_QUANT(mb_type))
 730             s->qscale = get_qscale(s);
 731
 732         if (s->concealment_motion_vectors) {
 733             /* just parse them */
 734             if (s->picture_structure != PICT_FRAME)
 735                 skip_bits1(&s->gb); /* field select */
 736
 737             s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
 738                 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
 739             s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
 740                 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
 741
 742             skip_bits1(&s->gb); /* marker */
 743         } else
 744             memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
 745         s->mb_intra = 1;
 746         // if 1, we memcpy blocks in xvmcvideo
 747         if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1) {
 748             ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
 749             if (s->swap_uv) {
 750                 exchange_uv(s);
 751             }
 752         }
 753
 754         if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
 755             if (s->flags2 & CODEC_FLAG2_FAST) {
 756                 for (i = 0; i < 6; i++) {
 757                     mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
 758                 }
 759             } else {
 760                 for (i = 0; i < mb_block_count; i++) {
 761                     if (mpeg2_decode_block_intra(s, *s->pblocks[i], i) < 0)
 762                         return -1;
 763                 }
 764             }
 765         } else {
 766             for (i = 0; i < 6; i++) {
 767                 if (mpeg1_decode_block_intra(s, *s->pblocks[i], i) < 0)
 768                     return -1;
 769             }
 770         }
 771     } else {
 772         if (mb_type & MB_TYPE_ZERO_MV) {
 773             av_assert2(mb_type & MB_TYPE_CBP);
 774
 775             s->mv_dir = MV_DIR_FORWARD;
 776             if (s->picture_structure == PICT_FRAME) {
 777                 if (s->picture_structure == PICT_FRAME
 778                     && !s->frame_pred_frame_dct)
 779                     s->interlaced_dct = get_bits1(&s->gb);
 780                 s->mv_type = MV_TYPE_16X16;
 781             } else {
 782                 s->mv_type = MV_TYPE_FIELD;
 783                 mb_type |= MB_TYPE_INTERLACED;
 784                 s->field_select[0][0] = s->picture_structure - 1;
 785             }
 786
 787             if (IS_QUANT(mb_type))
 788                 s->qscale = get_qscale(s);
 789
 790             s->last_mv[0][0][0] = 0;
 791             s->last_mv[0][0][1] = 0;
 792             s->last_mv[0][1][0] = 0;
 793             s->last_mv[0][1][1] = 0;
 794             s->mv[0][0][0] = 0;
 795             s->mv[0][0][1] = 0;
 796         } else {
 797             av_assert2(mb_type & MB_TYPE_L0L1);
 798             // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
 799             /* get additional motion vector type */
 800             if (s->picture_structure == PICT_FRAME && s->frame_pred_frame_dct)
 801                 motion_type = MT_FRAME;
 802             else {
 803                 motion_type = get_bits(&s->gb, 2);
 804                 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
 805                     s->interlaced_dct = get_bits1(&s->gb);
 806             }
 807
 808             if (IS_QUANT(mb_type))
 809                 s->qscale = get_qscale(s);
 810
 811             /* motion vectors */
 812             s->mv_dir = (mb_type >> 13) & 3;
 813             av_dlog(s->avctx, "motion_type=%d\n", motion_type);
 814             switch (motion_type) {
 815             case MT_FRAME: /* or MT_16X8 */
 816                 if (s->picture_structure == PICT_FRAME) {
 817                     mb_type |= MB_TYPE_16x16;
 818                     s->mv_type = MV_TYPE_16X16;
 819                     for (i = 0; i < 2; i++) {
 820                         if (USES_LIST(mb_type, i)) {
 821                             /* MT_FRAME */
 822                             s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
 823                                 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
 824                             s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
 825                                 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
 826                             /* full_pel: only for MPEG-1 */
 827                             if (s->full_pel[i]) {
 828                                 s->mv[i][0][0] <<= 1;
 829                                 s->mv[i][0][1] <<= 1;
 830                             }
 831                         }
 832                     }
 833                 } else {
 834                     mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
 835                     s->mv_type = MV_TYPE_16X8;
 836                     for (i = 0; i < 2; i++) {
 837                         if (USES_LIST(mb_type, i)) {
 838                             /* MT_16X8 */
 839                             for (j = 0; j < 2; j++) {
 840                                 s->field_select[i][j] = get_bits1(&s->gb);
 841                                 for (k = 0; k < 2; k++) {
 842                                     val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
 843                                                              s->last_mv[i][j][k]);
 844                                     s->last_mv[i][j][k] = val;
 845                                     s->mv[i][j][k]      = val;
 846                                 }
 847                             }
 848                         }
 849                     }
 850                 }
 851                 break;
 852             case MT_FIELD:
 853                 s->mv_type = MV_TYPE_FIELD;
 854                 if (s->picture_structure == PICT_FRAME) {
 855                     mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
 856                     for (i = 0; i < 2; i++) {
 857                         if (USES_LIST(mb_type, i)) {
 858                             for (j = 0; j < 2; j++) {
 859                                 s->field_select[i][j] = get_bits1(&s->gb);
 860                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
 861                                                          s->last_mv[i][j][0]);
 862                                 s->last_mv[i][j][0] = val;
 863                                 s->mv[i][j][0]      = val;
 864                                 av_dlog(s->avctx, "fmx=%d\n", val);
 865                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
 866                                                          s->last_mv[i][j][1] >> 1);
 867                                 s->last_mv[i][j][1] = val << 1;
 868                                 s->mv[i][j][1]      = val;
 869                                 av_dlog(s->avctx, "fmy=%d\n", val);
 870                             }
 871                         }
 872                     }
 873                 } else {
 874                     av_assert0(!s->progressive_sequence);
 875                     mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
 876                     for (i = 0; i < 2; i++) {
 877                         if (USES_LIST(mb_type, i)) {
 878                             s->field_select[i][0] = get_bits1(&s->gb);
 879                             for (k = 0; k < 2; k++) {
 880                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
 881                                                          s->last_mv[i][0][k]);
 882                                 s->last_mv[i][0][k] = val;
 883                                 s->last_mv[i][1][k] = val;
 884                                 s->mv[i][0][k]      = val;
 885                             }
 886                         }
 887                     }
 888                 }
 889                 break;
 890             case MT_DMV:
 891                 if(s->progressive_sequence){
 892                     av_log(s->avctx, AV_LOG_ERROR, "MT_DMV in progressive_sequence\n");
 893                     return -1;
 894                 }
 895                 s->mv_type = MV_TYPE_DMV;
 896                 for (i = 0; i < 2; i++) {
 897                     if (USES_LIST(mb_type, i)) {
 898                         int dmx, dmy, mx, my, m;
 899                         const int my_shift = s->picture_structure == PICT_FRAME;
 900
 901                         mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
 902                                                 s->last_mv[i][0][0]);
 903                         s->last_mv[i][0][0] = mx;
 904                         s->last_mv[i][1][0] = mx;
 905                         dmx = get_dmv(s);
 906                         my  = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
 907                                                  s->last_mv[i][0][1] >> my_shift);
 908                         dmy = get_dmv(s);
 909
 910
 911                         s->last_mv[i][0][1] = my << my_shift;
 912                         s->last_mv[i][1][1] = my << my_shift;
 913
 914                         s->mv[i][0][0] = mx;
 915                         s->mv[i][0][1] = my;
 916                         s->mv[i][1][0] = mx; // not used
 917                         s->mv[i][1][1] = my; // not used
 918
 919                         if (s->picture_structure == PICT_FRAME) {
 920                             mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
 921
 922                             // m = 1 + 2 * s->top_field_first;
 923                             m = s->top_field_first ? 1 : 3;
 924
 925                             /* top -> top pred */
 926                             s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
 927                             s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
 928                             m = 4 - m;
 929                             s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
 930                             s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
 931                         } else {
 932                             mb_type |= MB_TYPE_16x16;
 933
 934                             s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
 935                             s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
 936                             if (s->picture_structure == PICT_TOP_FIELD)
 937                                 s->mv[i][2][1]--;
 938                             else
 939                                 s->mv[i][2][1]++;
 940                         }
 941                     }
 942                 }
 943                 break;
 944             default:
 945                 av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
 946                 return -1;
 947             }
 948         }
 949
 950         s->mb_intra = 0;
 951         if (HAS_CBP(mb_type)) {
 952             s->dsp.clear_blocks(s->block[0]);
 953
 954             cbp = get_vlc2(&s->gb, ff_mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
 955             if (mb_block_count > 6) {
 956                  cbp <<= mb_block_count - 6;
 957                  cbp  |= get_bits(&s->gb, mb_block_count - 6);
 958                  s->dsp.clear_blocks(s->block[6]);
 959             }
 960             if (cbp <= 0) {
 961                 av_log(s->avctx, AV_LOG_ERROR, "invalid cbp %d at %d %d\n", cbp, s->mb_x, s->mb_y);
 962                 return -1;
 963             }
 964
 965             //if 1, we memcpy blocks in xvmcvideo
 966             if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1) {
 967                 ff_xvmc_pack_pblocks(s, cbp);
 968                 if (s->swap_uv) {
 969                     exchange_uv(s);
 970                 }
 971             }
 972
 973             if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
 974                 if (s->flags2 & CODEC_FLAG2_FAST) {
 975                     for (i = 0; i < 6; i++) {
 976                         if (cbp & 32) {
 977                             mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
 978                         } else {
 979                             s->block_last_index[i] = -1;
 980                         }
 981                         cbp += cbp;
 982                     }
 983                 } else {
 984                     cbp <<= 12-mb_block_count;
 985
 986                     for (i = 0; i < mb_block_count; i++) {
 987                         if (cbp & (1 << 11)) {
 988                             if (mpeg2_decode_block_non_intra(s, *s->pblocks[i], i) < 0)
 989                                 return -1;
 990                         } else {
 991                             s->block_last_index[i] = -1;
 992                         }
 993                         cbp += cbp;
 994                     }
 995                 }
 996             } else {
 997                 if (s->flags2 & CODEC_FLAG2_FAST) {
 998                     for (i = 0; i < 6; i++) {
 999                         if (cbp & 32) {
1000                             mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1001                         } else {
1002                             s->block_last_index[i] = -1;
1003                         }
1004                         cbp += cbp;
1005                     }
1006                 } else {
1007                     for (i = 0; i < 6; i++) {
1008                         if (cbp & 32) {
1009                             if (mpeg1_decode_block_inter(s, *s->pblocks[i], i) < 0)
1010                                 return -1;
1011                         } else {
1012                             s->block_last_index[i] = -1;
1013                         }
1014                         cbp += cbp;
1015                     }
1016                 }
1017             }
1018         } else {
1019             for (i = 0; i < 12; i++)
1020                 s->block_last_index[i] = -1;
1021         }
1022     }
1023
1024     s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1025
1026     return 0;
1027 }
1028
1029 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1030 {
1031     Mpeg1Context *s = avctx->priv_data;
1032     MpegEncContext *s2 = &s->mpeg_enc_ctx;
1033     int i;
1034
1035     /* we need some permutation to store matrices,
1036      * until MPV_common_init() sets the real permutation. */
1037     for (i = 0; i < 64; i++)
1038        s2->dsp.idct_permutation[i]=i;
1039
1040     ff_MPV_decode_defaults(s2);
1041
1042     s->mpeg_enc_ctx.avctx  = avctx;
1043     s->mpeg_enc_ctx.flags  = avctx->flags;
1044     s->mpeg_enc_ctx.flags2 = avctx->flags2;
1045     ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1046     ff_mpeg12_init_vlcs();
1047
1048     s->mpeg_enc_ctx_allocated      = 0;
1049     s->mpeg_enc_ctx.picture_number = 0;
1050     s->repeat_field                = 0;
1051     s->mpeg_enc_ctx.codec_id       = avctx->codec->id;
1052     avctx->color_range = AVCOL_RANGE_MPEG;
1053     if (avctx->codec->id == AV_CODEC_ID_MPEG1VIDEO)
1054         avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1055     else
1056         avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
1057     return 0;
1058 }
1059
1060 static int mpeg_decode_update_thread_context(AVCodecContext *avctx, const AVCodecContext *avctx_from)
1061 {
1062     Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1063     MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1064     int err;
1065
1066     if (avctx == avctx_from || !ctx_from->mpeg_enc_ctx_allocated || !s1->context_initialized)
1067         return 0;
1068
1069     err = ff_mpeg_update_thread_context(avctx, avctx_from);
1070     if (err) return err;
1071
1072     if (!ctx->mpeg_enc_ctx_allocated)
1073         memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1074
1075     if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1076         s->picture_number++;
1077
1078     return 0;
1079 }
1080
1081 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1082                                  const uint8_t *new_perm)
1083 {
1084     uint16_t temp_matrix[64];
1085     int i;
1086
1087     memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1088
1089     for (i = 0; i < 64; i++) {
1090         matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1091     }
1092 }
1093
1094 static const enum AVPixelFormat mpeg1_hwaccel_pixfmt_list_420[] = {
1095 #if CONFIG_MPEG_XVMC_DECODER
1096     AV_PIX_FMT_XVMC_MPEG2_IDCT,
1097     AV_PIX_FMT_XVMC_MPEG2_MC,
1098 #endif
1099 #if CONFIG_MPEG1_VDPAU_HWACCEL
1100     AV_PIX_FMT_VDPAU_MPEG1,
1101     AV_PIX_FMT_VDPAU,
1102 #endif
1103     AV_PIX_FMT_YUV420P,
1104     AV_PIX_FMT_NONE
1105 };
1106
1107 static const enum AVPixelFormat mpeg2_hwaccel_pixfmt_list_420[] = {
1108 #if CONFIG_MPEG_XVMC_DECODER
1109     AV_PIX_FMT_XVMC_MPEG2_IDCT,
1110     AV_PIX_FMT_XVMC_MPEG2_MC,
1111 #endif
1112 #if CONFIG_MPEG2_VDPAU_HWACCEL
1113     AV_PIX_FMT_VDPAU_MPEG2,
1114     AV_PIX_FMT_VDPAU,
1115 #endif
1116 #if CONFIG_MPEG2_DXVA2_HWACCEL
1117     AV_PIX_FMT_DXVA2_VLD,
1118 #endif
1119 #if CONFIG_MPEG2_VAAPI_HWACCEL
1120     AV_PIX_FMT_VAAPI_VLD,
1121 #endif
1122     AV_PIX_FMT_YUV420P,
1123     AV_PIX_FMT_NONE
1124 };
1125
1126 static inline int uses_vdpau(AVCodecContext *avctx) {
1127     return avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG1 || avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG2;
1128 }
1129
1130 static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
1131 {
1132     Mpeg1Context *s1 = avctx->priv_data;
1133     MpegEncContext *s = &s1->mpeg_enc_ctx;
1134
1135     if(s->chroma_format < 2) {
1136         return ff_thread_get_format(avctx,
1137                                 avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO ?
1138                                 mpeg1_hwaccel_pixfmt_list_420 :
1139                                 mpeg2_hwaccel_pixfmt_list_420);
1140     } else if(s->chroma_format == 2)
1141         return AV_PIX_FMT_YUV422P;
1142     else
1143         return AV_PIX_FMT_YUV444P;
1144 }
1145
1146 static void setup_hwaccel_for_pixfmt(AVCodecContext *avctx)
1147 {
1148     if (avctx->pix_fmt != AV_PIX_FMT_XVMC_MPEG2_IDCT && avctx->pix_fmt != AV_PIX_FMT_XVMC_MPEG2_MC) {
1149         avctx->xvmc_acceleration = 0;
1150     } else if (!avctx->xvmc_acceleration) {
1151         avctx->xvmc_acceleration = 2;
1152     }
1153     avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
1154     // until then pix_fmt may be changed right after codec init
1155     if (avctx->pix_fmt == AV_PIX_FMT_XVMC_MPEG2_IDCT ||
1156         avctx->hwaccel || uses_vdpau(avctx))
1157         if (avctx->idct_algo == FF_IDCT_AUTO)
1158             avctx->idct_algo = FF_IDCT_SIMPLE;
1159 }
1160
1161 /* Call this function when we know all parameters.
1162  * It may be called in different places for MPEG-1 and MPEG-2. */
1163 static int mpeg_decode_postinit(AVCodecContext *avctx)
1164 {
1165     Mpeg1Context *s1 = avctx->priv_data;
1166     MpegEncContext *s = &s1->mpeg_enc_ctx;
1167     uint8_t old_permutation[64];
1168
1169     if ((s1->mpeg_enc_ctx_allocated == 0) ||
1170         avctx->coded_width  != s->width   ||
1171         avctx->coded_height != s->height  ||
1172         s1->save_width           != s->width                ||
1173         s1->save_height          != s->height               ||
1174         s1->save_aspect_info     != s->aspect_ratio_info    ||
1175         s1->save_progressive_seq != s->progressive_sequence ||
1176         0)
1177     {
1178
1179         if (s1->mpeg_enc_ctx_allocated) {
1180             ParseContext pc = s->parse_context;
1181             s->parse_context.buffer = 0;
1182             ff_MPV_common_end(s);
1183             s->parse_context = pc;
1184         }
1185
1186         if ((s->width == 0) || (s->height == 0))
1187             return -2;
1188
1189         avcodec_set_dimensions(avctx, s->width, s->height);
1190         if (avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->bit_rate) {
1191             avctx->rc_max_rate = s->bit_rate;
1192         } else if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && s->bit_rate &&
1193                    (s->bit_rate != 0x3FFFF*400 || s->vbv_delay != 0xFFFF)) {
1194             avctx->bit_rate = s->bit_rate;
1195         }
1196         s1->save_aspect_info     = s->aspect_ratio_info;
1197         s1->save_width           = s->width;
1198         s1->save_height          = s->height;
1199         s1->save_progressive_seq = s->progressive_sequence;
1200
1201         /* low_delay may be forced, in this case we will have B-frames
1202          * that behave like P-frames. */
1203         avctx->has_b_frames = !s->low_delay;
1204
1205         if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1206             //MPEG-1 fps
1207             avctx->time_base.den = ff_mpeg12_frame_rate_tab[s->frame_rate_index].num;
1208             avctx->time_base.num = ff_mpeg12_frame_rate_tab[s->frame_rate_index].den;
1209             //MPEG-1 aspect
1210             avctx->sample_aspect_ratio = av_d2q(1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1211             avctx->ticks_per_frame=1;
1212         } else {//MPEG-2
1213         //MPEG-2 fps
1214             av_reduce(&s->avctx->time_base.den,
1215                       &s->avctx->time_base.num,
1216                       ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num*2,
1217                       ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1218                       1 << 30);
1219             avctx->ticks_per_frame = 2;
1220             //MPEG-2 aspect
1221             if (s->aspect_ratio_info > 1) {
1222                 AVRational dar =
1223                     av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1224                                       (AVRational) {s1->pan_scan.width, s1->pan_scan.height}),
1225                              (AVRational) {s->width, s->height});
1226
1227                 // we ignore the spec here and guess a bit as reality does not match the spec, see for example
1228                 // res_change_ffmpeg_aspect.ts and sequence-display-aspect.mpg
1229                 // issue1613, 621, 562
1230                 if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1231                    (av_cmp_q(dar, (AVRational) {4, 3}) && av_cmp_q(dar, (AVRational) {16, 9}))) {
1232                     s->avctx->sample_aspect_ratio =
1233                         av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1234                                  (AVRational) {s->width, s->height});
1235                 } else {
1236                     s->avctx->sample_aspect_ratio =
1237                         av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1238                                  (AVRational) {s1->pan_scan.width, s1->pan_scan.height});
1239 //issue1613 4/3 16/9 -> 16/9
1240 //res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1241 //widescreen-issue562.mpg 4/3 16/9 -> 16/9
1242 //                    s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1243                     av_dlog(avctx, "A %d/%d\n",
1244                             ff_mpeg2_aspect[s->aspect_ratio_info].num, ff_mpeg2_aspect[s->aspect_ratio_info].den);
1245                     av_dlog(avctx, "B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1246                             s->avctx->sample_aspect_ratio.den);
1247                 }
1248             } else {
1249                 s->avctx->sample_aspect_ratio =
1250                     ff_mpeg2_aspect[s->aspect_ratio_info];
1251             }
1252         } // MPEG-2
1253
1254         avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1255         setup_hwaccel_for_pixfmt(avctx);
1256
1257         /* Quantization matrices may need reordering
1258          * if DCT permutation is changed. */
1259         memcpy(old_permutation, s->dsp.idct_permutation, 64 * sizeof(uint8_t));
1260
1261         if (ff_MPV_common_init(s) < 0)
1262             return -2;
1263
1264         quant_matrix_rebuild(s->intra_matrix,        old_permutation, s->dsp.idct_permutation);
1265         quant_matrix_rebuild(s->inter_matrix,        old_permutation, s->dsp.idct_permutation);
1266         quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->dsp.idct_permutation);
1267         quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->dsp.idct_permutation);
1268
1269         s1->mpeg_enc_ctx_allocated = 1;
1270     }
1271     return 0;
1272 }
1273
1274 static int mpeg1_decode_picture(AVCodecContext *avctx,
1275                                 const uint8_t *buf, int buf_size)
1276 {
1277     Mpeg1Context *s1 = avctx->priv_data;
1278     MpegEncContext *s = &s1->mpeg_enc_ctx;
1279     int ref, f_code, vbv_delay;
1280
1281     init_get_bits(&s->gb, buf, buf_size*8);
1282
1283     ref = get_bits(&s->gb, 10); /* temporal ref */
1284     s->pict_type = get_bits(&s->gb, 3);
1285     if (s->pict_type == 0 || s->pict_type > 3)
1286         return -1;
1287
1288     vbv_delay = get_bits(&s->gb, 16);
1289     s->vbv_delay = vbv_delay;
1290     if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
1291         s->full_pel[0] = get_bits1(&s->gb);
1292         f_code = get_bits(&s->gb, 3);
1293         if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1294             return -1;
1295         f_code += !f_code;
1296         s->mpeg_f_code[0][0] = f_code;
1297         s->mpeg_f_code[0][1] = f_code;
1298     }
1299     if (s->pict_type == AV_PICTURE_TYPE_B) {
1300         s->full_pel[1] = get_bits1(&s->gb);
1301         f_code = get_bits(&s->gb, 3);
1302         if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1303             return -1;
1304         f_code += !f_code;
1305         s->mpeg_f_code[1][0] = f_code;
1306         s->mpeg_f_code[1][1] = f_code;
1307     }
1308     s->current_picture.f.pict_type = s->pict_type;
1309     s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1310
1311     if (avctx->debug & FF_DEBUG_PICT_INFO)
1312         av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1313
1314     s->y_dc_scale = 8;
1315     s->c_dc_scale = 8;
1316     return 0;
1317 }
1318
1319 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1320 {
1321     MpegEncContext *s= &s1->mpeg_enc_ctx;
1322     int horiz_size_ext, vert_size_ext;
1323     int bit_rate_ext;
1324
1325     skip_bits(&s->gb, 1); /* profile and level esc*/
1326     s->avctx->profile       = get_bits(&s->gb, 3);
1327     s->avctx->level         = get_bits(&s->gb, 4);
1328     s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1329     s->chroma_format        = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1330     horiz_size_ext          = get_bits(&s->gb, 2);
1331     vert_size_ext           = get_bits(&s->gb, 2);
1332     s->width  |= (horiz_size_ext << 12);
1333     s->height |= (vert_size_ext  << 12);
1334     bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1335     s->bit_rate += (bit_rate_ext << 18) * 400;
1336     skip_bits1(&s->gb); /* marker */
1337     s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1338
1339     s->low_delay = get_bits1(&s->gb);
1340     if (s->flags & CODEC_FLAG_LOW_DELAY)
1341         s->low_delay = 1;
1342
1343     s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1344     s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1345
1346     av_dlog(s->avctx, "sequence extension\n");
1347     s->codec_id      = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1348
1349     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1350         av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1351                s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
1352
1353 }
1354
1355 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1356 {
1357     MpegEncContext *s = &s1->mpeg_enc_ctx;
1358     int color_description, w, h;
1359
1360     skip_bits(&s->gb, 3); /* video format */
1361     color_description = get_bits1(&s->gb);
1362     if (color_description) {
1363         s->avctx->color_primaries = get_bits(&s->gb, 8);
1364         s->avctx->color_trc       = get_bits(&s->gb, 8);
1365         s->avctx->colorspace      = get_bits(&s->gb, 8);
1366     }
1367     w = get_bits(&s->gb, 14);
1368     skip_bits(&s->gb, 1); //marker
1369     h = get_bits(&s->gb, 14);
1370     // remaining 3 bits are zero padding
1371
1372     s1->pan_scan.width  = 16 * w;
1373     s1->pan_scan.height = 16 * h;
1374
1375     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1376         av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1377 }
1378
1379 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1380 {
1381     MpegEncContext *s = &s1->mpeg_enc_ctx;
1382     int i, nofco;
1383
1384     nofco = 1;
1385     if (s->progressive_sequence) {
1386         if (s->repeat_first_field) {
1387             nofco++;
1388             if (s->top_field_first)
1389                 nofco++;
1390         }
1391     } else {
1392         if (s->picture_structure == PICT_FRAME) {
1393             nofco++;
1394             if (s->repeat_first_field)
1395                 nofco++;
1396         }
1397     }
1398     for (i = 0; i < nofco; i++) {
1399         s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1400         skip_bits(&s->gb, 1); // marker
1401         s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1402         skip_bits(&s->gb, 1); // marker
1403     }
1404
1405     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1406         av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1407                s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1408                s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1409                s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1410 }
1411
1412 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64], uint16_t matrix1[64], int intra)
1413 {
1414     int i;
1415
1416     for (i = 0; i < 64; i++) {
1417         int j = s->dsp.idct_permutation[ff_zigzag_direct[i]];
1418         int v = get_bits(&s->gb, 8);
1419         if (v == 0) {
1420             av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1421             return -1;
1422         }
1423         if (intra && i == 0 && v != 8) {
1424             av_log(s->avctx, AV_LOG_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v);
1425             v = 8; // needed by pink.mpg / issue1046
1426         }
1427         matrix0[j] = v;
1428         if (matrix1)
1429             matrix1[j] = v;
1430     }
1431     return 0;
1432 }
1433
1434 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1435 {
1436     av_dlog(s->avctx, "matrix extension\n");
1437
1438     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1439     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1440     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, NULL           , 1);
1441     if (get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, NULL           , 0);
1442 }
1443
1444 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1445 {
1446     MpegEncContext *s = &s1->mpeg_enc_ctx;
1447
1448     s->full_pel[0] = s->full_pel[1] = 0;
1449     s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1450     s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1451     s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1452     s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1453     if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1454         av_log(s->avctx, AV_LOG_ERROR, "Missing picture start code, guessing missing values\n");
1455         if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1456             if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1457                 s->pict_type = AV_PICTURE_TYPE_I;
1458             else
1459                 s->pict_type = AV_PICTURE_TYPE_P;
1460         } else
1461             s->pict_type = AV_PICTURE_TYPE_B;
1462         s->current_picture.f.pict_type = s->pict_type;
1463         s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1464     }
1465     s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0];
1466     s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1];
1467     s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0];
1468     s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1];
1469
1470     s->intra_dc_precision         = get_bits(&s->gb, 2);
1471     s->picture_structure          = get_bits(&s->gb, 2);
1472     s->top_field_first            = get_bits1(&s->gb);
1473     s->frame_pred_frame_dct       = get_bits1(&s->gb);
1474     s->concealment_motion_vectors = get_bits1(&s->gb);
1475     s->q_scale_type               = get_bits1(&s->gb);
1476     s->intra_vlc_format           = get_bits1(&s->gb);
1477     s->alternate_scan             = get_bits1(&s->gb);
1478     s->repeat_first_field         = get_bits1(&s->gb);
1479     s->chroma_420_type            = get_bits1(&s->gb);
1480     s->progressive_frame          = get_bits1(&s->gb);
1481
1482
1483     if (s->alternate_scan) {
1484         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1485         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1486     } else {
1487         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1488         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1489     }
1490
1491     /* composite display not parsed */
1492     av_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1493     av_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1494     av_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1495     av_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1496     av_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1497     av_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1498     av_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1499     av_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1500     av_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1501 }
1502
1503 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1504 {
1505     AVCodecContext *avctx = s->avctx;
1506     Mpeg1Context *s1 = (Mpeg1Context*)s;
1507
1508     /* start frame decoding */
1509     if (s->first_field || s->picture_structure == PICT_FRAME) {
1510         AVFrameSideData *pan_scan;
1511
1512         if (ff_MPV_frame_start(s, avctx) < 0)
1513             return -1;
1514
1515         ff_mpeg_er_frame_start(s);
1516
1517         /* first check if we must repeat the frame */
1518         s->current_picture_ptr->f.repeat_pict = 0;
1519         if (s->repeat_first_field) {
1520             if (s->progressive_sequence) {
1521                 if (s->top_field_first)
1522                     s->current_picture_ptr->f.repeat_pict = 4;
1523                 else
1524                     s->current_picture_ptr->f.repeat_pict = 2;
1525             } else if (s->progressive_frame) {
1526                 s->current_picture_ptr->f.repeat_pict = 1;
1527             }
1528         }
1529
1530         pan_scan = av_frame_new_side_data(&s->current_picture_ptr->f,
1531                                           AV_FRAME_DATA_PANSCAN,
1532                                           sizeof(s1->pan_scan));
1533         if (!pan_scan)
1534             return AVERROR(ENOMEM);
1535         memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
1536
1537         if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1538             ff_thread_finish_setup(avctx);
1539     } else { // second field
1540         int i;
1541
1542         if (!s->current_picture_ptr) {
1543             av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1544             return -1;
1545         }
1546
1547         if (s->avctx->hwaccel &&
1548             (s->avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
1549             if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1550                 av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode first field\n");
1551         }
1552
1553         for (i = 0; i < 4; i++) {
1554             s->current_picture.f.data[i] = s->current_picture_ptr->f.data[i];
1555             if (s->picture_structure == PICT_BOTTOM_FIELD) {
1556                 s->current_picture.f.data[i] += s->current_picture_ptr->f.linesize[i];
1557             }
1558         }
1559     }
1560
1561     if (avctx->hwaccel) {
1562         if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
1563             return -1;
1564     }
1565
1566 // MPV_frame_start will call this function too,
1567 // but we need to call it on every field
1568     if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1569         if (ff_xvmc_field_start(s, avctx) < 0)
1570             return -1;
1571
1572     return 0;
1573 }
1574
1575 #define DECODE_SLICE_ERROR -1
1576 #define DECODE_SLICE_OK     0
1577
1578 /**
1579  * Decode a slice.
1580  * MpegEncContext.mb_y must be set to the MB row from the startcode.
1581  * @return DECODE_SLICE_ERROR if the slice is damaged,
1582  *         DECODE_SLICE_OK if this slice is OK
1583  */
1584 static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1585                              const uint8_t **buf, int buf_size)
1586 {
1587     AVCodecContext *avctx = s->avctx;
1588     const int lowres      = s->avctx->lowres;
1589     const int field_pic   = s->picture_structure != PICT_FRAME;
1590
1591     s->resync_mb_x =
1592     s->resync_mb_y = -1;
1593
1594     av_assert0(mb_y < s->mb_height);
1595
1596     init_get_bits(&s->gb, *buf, buf_size * 8);
1597     if(s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1598         skip_bits(&s->gb, 3);
1599
1600     ff_mpeg1_clean_buffers(s);
1601     s->interlaced_dct = 0;
1602
1603     s->qscale = get_qscale(s);
1604
1605     if (s->qscale == 0) {
1606         av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1607         return -1;
1608     }
1609
1610     /* extra slice info */
1611     while (get_bits1(&s->gb) != 0) {
1612         skip_bits(&s->gb, 8);
1613     }
1614
1615     s->mb_x = 0;
1616
1617     if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1618         skip_bits1(&s->gb);
1619     } else {
1620         while (get_bits_left(&s->gb) > 0) {
1621             int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1622                                 MBINCR_VLC_BITS, 2);
1623             if (code < 0) {
1624                 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1625                 return -1;
1626             }
1627             if (code >= 33) {
1628                 if (code == 33) {
1629                     s->mb_x += 33;
1630                 }
1631                 /* otherwise, stuffing, nothing to do */
1632             } else {
1633                 s->mb_x += code;
1634                 break;
1635             }
1636         }
1637     }
1638
1639     if (s->mb_x >= (unsigned)s->mb_width) {
1640         av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1641         return -1;
1642     }
1643
1644     if (avctx->hwaccel) {
1645         const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1646         int start_code = -1;
1647         buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1648         if (buf_end < *buf + buf_size)
1649             buf_end -= 4;
1650         s->mb_y = mb_y;
1651         if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1652             return DECODE_SLICE_ERROR;
1653         *buf = buf_end;
1654         return DECODE_SLICE_OK;
1655     }
1656
1657     s->resync_mb_x = s->mb_x;
1658     s->resync_mb_y = s->mb_y = mb_y;
1659     s->mb_skip_run = 0;
1660     ff_init_block_index(s);
1661
1662     if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1663         if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1664              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",
1665                     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],
1666                     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")),
1667                     s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1668                     s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1669                     s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1670         }
1671     }
1672
1673     for (;;) {
1674         // If 1, we memcpy blocks in xvmcvideo.
1675         if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
1676             ff_xvmc_init_block(s); // set s->block
1677
1678         if (mpeg_decode_mb(s, s->block) < 0)
1679             return -1;
1680
1681         if (s->current_picture.motion_val[0] && !s->encoding) { // note motion_val is normally NULL unless we want to extract the MVs
1682             const int wrap = s->b8_stride;
1683             int xy         = s->mb_x * 2 + s->mb_y * 2 * wrap;
1684             int b8_xy      = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1685             int motion_x, motion_y, dir, i;
1686
1687             for (i = 0; i < 2; i++) {
1688                 for (dir = 0; dir < 2; dir++) {
1689                     if (s->mb_intra || (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1690                         motion_x = motion_y = 0;
1691                     } else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1692                         motion_x = s->mv[dir][0][0];
1693                         motion_y = s->mv[dir][0][1];
1694                     } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
1695                         motion_x = s->mv[dir][i][0];
1696                         motion_y = s->mv[dir][i][1];
1697                     }
1698
1699                     s->current_picture.motion_val[dir][xy    ][0] = motion_x;
1700                     s->current_picture.motion_val[dir][xy    ][1] = motion_y;
1701                     s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1702                     s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1703                     s->current_picture.ref_index [dir][b8_xy    ] =
1704                     s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1705                     av_assert2(s->field_select[dir][i] == 0 || s->field_select[dir][i] == 1);
1706                 }
1707                 xy += wrap;
1708                 b8_xy +=2;
1709             }
1710         }
1711
1712         s->dest[0] += 16 >> lowres;
1713         s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1714         s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1715
1716         ff_MPV_decode_mb(s, s->block);
1717
1718         if (++s->mb_x >= s->mb_width) {
1719             const int mb_size = 16 >> s->avctx->lowres;
1720
1721             ff_mpeg_draw_horiz_band(s, mb_size*(s->mb_y >> field_pic), mb_size);
1722             ff_MPV_report_decode_progress(s);
1723
1724             s->mb_x = 0;
1725             s->mb_y += 1 << field_pic;
1726
1727             if (s->mb_y >= s->mb_height) {
1728                 int left   = get_bits_left(&s->gb);
1729                 int is_d10 = s->chroma_format == 2 && s->pict_type == AV_PICTURE_TYPE_I && avctx->profile == 0 && avctx->level == 5
1730                              && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
1731                              && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
1732
1733                 if (left >= 32 && !is_d10) {
1734                     GetBitContext gb = s->gb;
1735                     align_get_bits(&gb);
1736                     if (show_bits(&gb, 24) == 0x060E2B) {
1737                         av_log(avctx, AV_LOG_DEBUG, "Invalid MXF data found in video stream\n");
1738                         is_d10 = 1;
1739                     }
1740                 }
1741
1742                 if (left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
1743                     || ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
1744                     av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
1745                     return -1;
1746                 } else
1747                     goto eos;
1748             }
1749
1750             ff_init_block_index(s);
1751         }
1752
1753         /* skip mb handling */
1754         if (s->mb_skip_run == -1) {
1755             /* read increment again */
1756             s->mb_skip_run = 0;
1757             for (;;) {
1758                 int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1759                                     MBINCR_VLC_BITS, 2);
1760                 if (code < 0) {
1761                     av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1762                     return -1;
1763                 }
1764                 if (code >= 33) {
1765                     if (code == 33) {
1766                         s->mb_skip_run += 33;
1767                     } else if (code == 35) {
1768                         if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1769                             av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1770                             return -1;
1771                         }
1772                         goto eos; /* end of slice */
1773                     }
1774                     /* otherwise, stuffing, nothing to do */
1775                 } else {
1776                     s->mb_skip_run += code;
1777                     break;
1778                 }
1779             }
1780             if (s->mb_skip_run) {
1781                 int i;
1782                 if (s->pict_type == AV_PICTURE_TYPE_I) {
1783                     av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1784                     return -1;
1785                 }
1786
1787                 /* skip mb */
1788                 s->mb_intra = 0;
1789                 for (i = 0; i < 12; i++)
1790                     s->block_last_index[i] = -1;
1791                 if (s->picture_structure == PICT_FRAME)
1792                     s->mv_type = MV_TYPE_16X16;
1793                 else
1794                     s->mv_type = MV_TYPE_FIELD;
1795                 if (s->pict_type == AV_PICTURE_TYPE_P) {
1796                     /* if P type, zero motion vector is implied */
1797                     s->mv_dir             = MV_DIR_FORWARD;
1798                     s->mv[0][0][0]        = s->mv[0][0][1]      = 0;
1799                     s->last_mv[0][0][0]   = s->last_mv[0][0][1] = 0;
1800                     s->last_mv[0][1][0]   = s->last_mv[0][1][1] = 0;
1801                     s->field_select[0][0] = (s->picture_structure - 1) & 1;
1802                 } else {
1803                     /* if B type, reuse previous vectors and directions */
1804                     s->mv[0][0][0] = s->last_mv[0][0][0];
1805                     s->mv[0][0][1] = s->last_mv[0][0][1];
1806                     s->mv[1][0][0] = s->last_mv[1][0][0];
1807                     s->mv[1][0][1] = s->last_mv[1][0][1];
1808                 }
1809             }
1810         }
1811     }
1812 eos: // end of slice
1813     *buf += (get_bits_count(&s->gb)-1)/8;
1814     av_dlog(s, "y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1815     return 0;
1816 }
1817
1818 static int slice_decode_thread(AVCodecContext *c, void *arg)
1819 {
1820     MpegEncContext *s   = *(void**)arg;
1821     const uint8_t *buf  = s->gb.buffer;
1822     int mb_y            = s->start_mb_y;
1823     const int field_pic = s->picture_structure != PICT_FRAME;
1824
1825     s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
1826
1827     for (;;) {
1828         uint32_t start_code;
1829         int ret;
1830
1831         ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
1832         emms_c();
1833         av_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1834                 ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
1835                 s->start_mb_y, s->end_mb_y, s->er.error_count);
1836         if (ret < 0) {
1837             if (c->err_recognition & AV_EF_EXPLODE)
1838                 return ret;
1839             if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
1840                 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);
1841         } else {
1842             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);
1843         }
1844
1845         if (s->mb_y == s->end_mb_y)
1846             return 0;
1847
1848         start_code = -1;
1849         buf = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
1850         mb_y= start_code - SLICE_MIN_START_CODE;
1851         if(s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1852             mb_y += (*buf&0xE0)<<2;
1853         mb_y <<= field_pic;
1854         if (s->picture_structure == PICT_BOTTOM_FIELD)
1855             mb_y++;
1856         if (mb_y < 0 || mb_y >= s->end_mb_y)
1857             return -1;
1858     }
1859 }
1860
1861 /**
1862  * Handle slice ends.
1863  * @return 1 if it seems to be the last slice
1864  */
1865 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1866 {
1867     Mpeg1Context *s1 = avctx->priv_data;
1868     MpegEncContext *s = &s1->mpeg_enc_ctx;
1869
1870     if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1871         return 0;
1872
1873     if (s->avctx->hwaccel) {
1874         if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1875             av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode picture\n");
1876     }
1877
1878     if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1879         ff_xvmc_field_end(s);
1880
1881     /* end of slice reached */
1882     if (/*s->mb_y << field_pic == s->mb_height &&*/ !s->first_field && !s->first_slice) {
1883         /* end of image */
1884
1885         ff_er_frame_end(&s->er);
1886
1887         ff_MPV_frame_end(s);
1888
1889         if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
1890             int ret = av_frame_ref(pict, &s->current_picture_ptr->f);
1891             if (ret < 0)
1892                 return ret;
1893             ff_print_debug_info(s, s->current_picture_ptr, pict);
1894             ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG2);
1895         } else {
1896             if (avctx->active_thread_type & FF_THREAD_FRAME)
1897                 s->picture_number++;
1898             /* latency of 1 frame for I- and P-frames */
1899             /* XXX: use another variable than picture_number */
1900             if (s->last_picture_ptr != NULL) {
1901                 int ret = av_frame_ref(pict, &s->last_picture_ptr->f);
1902                 if (ret < 0)
1903                     return ret;
1904                 ff_print_debug_info(s, s->last_picture_ptr, pict);
1905                 ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG2);
1906             }
1907         }
1908
1909         return 1;
1910     } else {
1911         return 0;
1912     }
1913 }
1914
1915 static int mpeg1_decode_sequence(AVCodecContext *avctx,
1916                                  const uint8_t *buf, int buf_size)
1917 {
1918     Mpeg1Context *s1 = avctx->priv_data;
1919     MpegEncContext *s = &s1->mpeg_enc_ctx;
1920     int width, height;
1921     int i, v, j;
1922
1923     init_get_bits(&s->gb, buf, buf_size*8);
1924
1925     width  = get_bits(&s->gb, 12);
1926     height = get_bits(&s->gb, 12);
1927     if (width == 0 || height == 0) {
1928         av_log(avctx, AV_LOG_WARNING, "Invalid horizontal or vertical size "
1929                "value.\n");
1930         if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
1931             return AVERROR_INVALIDDATA;
1932     }
1933     s->aspect_ratio_info = get_bits(&s->gb, 4);
1934     if (s->aspect_ratio_info == 0) {
1935         av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
1936         if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
1937             return -1;
1938     }
1939     s->frame_rate_index = get_bits(&s->gb, 4);
1940     if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
1941         return -1;
1942     s->bit_rate = get_bits(&s->gb, 18) * 400;
1943     if (get_bits1(&s->gb) == 0) /* marker */
1944         return -1;
1945     s->width  = width;
1946     s->height = height;
1947
1948     s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
1949     skip_bits(&s->gb, 1);
1950
1951     /* get matrix */
1952     if (get_bits1(&s->gb)) {
1953         load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1954     } else {
1955         for (i = 0; i < 64; i++) {
1956             j = s->dsp.idct_permutation[i];
1957             v = ff_mpeg1_default_intra_matrix[i];
1958             s->intra_matrix[j]        = v;
1959             s->chroma_intra_matrix[j] = v;
1960         }
1961     }
1962     if (get_bits1(&s->gb)) {
1963         load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1964     } else {
1965         for (i = 0; i < 64; i++) {
1966             int j = s->dsp.idct_permutation[i];
1967             v = ff_mpeg1_default_non_intra_matrix[i];
1968             s->inter_matrix[j]        = v;
1969             s->chroma_inter_matrix[j] = v;
1970         }
1971     }
1972
1973     if (show_bits(&s->gb, 23) != 0) {
1974         av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
1975         return -1;
1976     }
1977
1978     /* we set MPEG-2 parameters so that it emulates MPEG-1 */
1979     s->progressive_sequence = 1;
1980     s->progressive_frame    = 1;
1981     s->picture_structure    = PICT_FRAME;
1982     s->first_field          = 0;
1983     s->frame_pred_frame_dct = 1;
1984     s->chroma_format        = 1;
1985     s->codec_id             = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
1986     s->out_format           = FMT_MPEG1;
1987     s->swap_uv              = 0; // AFAIK VCR2 does not have SEQ_HEADER
1988     if (s->flags & CODEC_FLAG_LOW_DELAY)
1989         s->low_delay = 1;
1990
1991     if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1992         av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
1993                s->avctx->rc_buffer_size, s->bit_rate);
1994
1995     return 0;
1996 }
1997
1998 static int vcr2_init_sequence(AVCodecContext *avctx)
1999 {
2000     Mpeg1Context *s1 = avctx->priv_data;
2001     MpegEncContext *s = &s1->mpeg_enc_ctx;
2002     int i, v;
2003
2004     /* start new MPEG-1 context decoding */
2005     s->out_format = FMT_MPEG1;
2006     if (s1->mpeg_enc_ctx_allocated) {
2007         ff_MPV_common_end(s);
2008     }
2009     s->width  = avctx->coded_width;
2010     s->height = avctx->coded_height;
2011     avctx->has_b_frames = 0; // true?
2012     s->low_delay = 1;
2013
2014     avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2015     setup_hwaccel_for_pixfmt(avctx);
2016
2017     if (ff_MPV_common_init(s) < 0)
2018         return -1;
2019     s1->mpeg_enc_ctx_allocated = 1;
2020
2021     for (i = 0; i < 64; i++) {
2022         int 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         v = ff_mpeg1_default_non_intra_matrix[i];
2028         s->inter_matrix[j]        = v;
2029         s->chroma_inter_matrix[j] = v;
2030     }
2031
2032     s->progressive_sequence  = 1;
2033     s->progressive_frame     = 1;
2034     s->picture_structure     = PICT_FRAME;
2035     s->first_field           = 0;
2036     s->frame_pred_frame_dct  = 1;
2037     s->chroma_format         = 1;
2038     if (s->codec_tag == AV_RL32("BW10")) {
2039         s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2040     } else {
2041         exchange_uv(s); // common init reset pblocks, so we swap them here
2042         s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
2043         s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
2044     }
2045     s1->save_width           = s->width;
2046     s1->save_height          = s->height;
2047     s1->save_progressive_seq = s->progressive_sequence;
2048     return 0;
2049 }
2050
2051
2052 static void mpeg_decode_user_data(AVCodecContext *avctx,
2053                                   const uint8_t *p, int buf_size)
2054 {
2055     Mpeg1Context *s = avctx->priv_data;
2056     const uint8_t *buf_end = p + buf_size;
2057
2058     if(buf_size > 29){
2059         int i;
2060         for(i=0; i<20; i++)
2061             if(!memcmp(p+i, "\0TMPGEXS\0", 9)){
2062                 s->tmpgexs= 1;
2063             }
2064
2065 /*        for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i<buf_size; i++){
2066             av_log(avctx, AV_LOG_ERROR, "%c", p[i]);
2067         }
2068             av_log(avctx, AV_LOG_ERROR, "\n");*/
2069     }
2070
2071     /* we parse the DTG active format information */
2072     if (buf_end - p >= 5 &&
2073         p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2074         int flags = p[4];
2075         p += 5;
2076         if (flags & 0x80) {
2077             /* skip event id */
2078             p += 2;
2079         }
2080         if (flags & 0x40) {
2081             if (buf_end - p < 1)
2082                 return;
2083             avctx->dtg_active_format = p[0] & 0x0f;
2084         }
2085     }
2086 }
2087
2088 static void mpeg_decode_gop(AVCodecContext *avctx,
2089                             const uint8_t *buf, int buf_size)
2090 {
2091     Mpeg1Context *s1  = avctx->priv_data;
2092     MpegEncContext *s = &s1->mpeg_enc_ctx;
2093     int broken_link;
2094     int64_t tc;
2095
2096     init_get_bits(&s->gb, buf, buf_size*8);
2097
2098     tc = avctx->timecode_frame_start = get_bits(&s->gb, 25);
2099
2100     s->closed_gop = get_bits1(&s->gb);
2101     /*broken_link indicate that after editing the
2102       reference frames of the first B-Frames after GOP I-Frame
2103       are missing (open gop)*/
2104     broken_link = get_bits1(&s->gb);
2105
2106     if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2107         char tcbuf[AV_TIMECODE_STR_SIZE];
2108         av_timecode_make_mpeg_tc_string(tcbuf, tc);
2109         av_log(s->avctx, AV_LOG_DEBUG,
2110                "GOP (%s) closed_gop=%d broken_link=%d\n",
2111                tcbuf, s->closed_gop, broken_link);
2112     }
2113 }
2114
2115 static int decode_chunks(AVCodecContext *avctx,
2116                          AVFrame *picture, int *got_output,
2117                          const uint8_t *buf, int buf_size)
2118 {
2119     Mpeg1Context *s = avctx->priv_data;
2120     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2121     const uint8_t *buf_ptr = buf;
2122     const uint8_t *buf_end = buf + buf_size;
2123     int ret, input_size;
2124     int last_code = 0, skip_frame = 0;
2125     int picture_start_code_seen = 0;
2126
2127     for (;;) {
2128         /* find next start code */
2129         uint32_t start_code = -1;
2130         buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
2131         if (start_code > 0x1ff) {
2132             if (!skip_frame) {
2133                 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE)) {
2134                     int i;
2135                     av_assert0(avctx->thread_count > 1);
2136
2137                     avctx->execute(avctx, slice_decode_thread,  &s2->thread_context[0], NULL, s->slice_count, sizeof(void*));
2138                     for (i = 0; i < s->slice_count; i++)
2139                         s2->er.error_count += s2->thread_context[i]->er.error_count;
2140                 }
2141
2142                 if ((CONFIG_MPEG_VDPAU_DECODER || CONFIG_MPEG1_VDPAU_DECODER)
2143                     && uses_vdpau(avctx))
2144                     ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2145
2146                 ret = slice_end(avctx, picture);
2147                 if (ret < 0)
2148                     return ret;
2149                 else if (ret) {
2150                     if (s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2151                         *got_output = 1;
2152                 }
2153             }
2154             s2->pict_type = 0;
2155             return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2156         }
2157
2158         input_size = buf_end - buf_ptr;
2159
2160         if (avctx->debug & FF_DEBUG_STARTCODE) {
2161             av_log(avctx, AV_LOG_DEBUG, "%3X at %td left %d\n", start_code, buf_ptr-buf, input_size);
2162         }
2163
2164         /* prepare data for next start code */
2165         switch (start_code) {
2166         case SEQ_START_CODE:
2167             if (last_code == 0) {
2168                 mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2169                 if(buf != avctx->extradata)
2170                     s->sync=1;
2171             } else {
2172                 av_log(avctx, AV_LOG_ERROR, "ignoring SEQ_START_CODE after %X\n", last_code);
2173                 if (avctx->err_recognition & AV_EF_EXPLODE)
2174                     return AVERROR_INVALIDDATA;
2175             }
2176             break;
2177
2178         case PICTURE_START_CODE:
2179             if (picture_start_code_seen && s2->picture_structure == PICT_FRAME) {
2180                /* If it's a frame picture, there can't be more than one picture header.
2181                   Yet, it does happen and we need to handle it. */
2182                av_log(avctx, AV_LOG_WARNING, "ignoring extra picture following a frame-picture\n");
2183                break;
2184             }
2185             picture_start_code_seen = 1;
2186
2187             if (s2->width <= 0 || s2->height <= 0) {
2188                 av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
2189                        s2->width, s2->height);
2190                 return AVERROR_INVALIDDATA;
2191             }
2192
2193             if(s->tmpgexs){
2194                 s2->intra_dc_precision= 3;
2195                 s2->intra_matrix[0]= 1;
2196             }
2197             if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) && s->slice_count) {
2198                 int i;
2199
2200                 avctx->execute(avctx, slice_decode_thread,
2201                                s2->thread_context, NULL,
2202                                s->slice_count, sizeof(void*));
2203                 for (i = 0; i < s->slice_count; i++)
2204                     s2->er.error_count += s2->thread_context[i]->er.error_count;
2205                 s->slice_count = 0;
2206             }
2207             if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2208                 ret = mpeg_decode_postinit(avctx);
2209                 if (ret < 0) {
2210                     av_log(avctx, AV_LOG_ERROR, "mpeg_decode_postinit() failure\n");
2211                     return ret;
2212                 }
2213
2214                 /* we have a complete image: we try to decompress it */
2215                 if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2216                     s2->pict_type = 0;
2217                 s2->first_slice = 1;
2218                 last_code = PICTURE_START_CODE;
2219             } else {
2220                 av_log(avctx, AV_LOG_ERROR, "ignoring pic after %X\n", last_code);
2221                 if (avctx->err_recognition & AV_EF_EXPLODE)
2222                     return AVERROR_INVALIDDATA;
2223             }
2224             break;
2225         case EXT_START_CODE:
2226             init_get_bits(&s2->gb, buf_ptr, input_size*8);
2227
2228             switch (get_bits(&s2->gb, 4)) {
2229             case 0x1:
2230                 if (last_code == 0) {
2231                 mpeg_decode_sequence_extension(s);
2232                 } else {
2233                     av_log(avctx, AV_LOG_ERROR, "ignoring seq ext after %X\n", last_code);
2234                     if (avctx->err_recognition & AV_EF_EXPLODE)
2235                         return AVERROR_INVALIDDATA;
2236                 }
2237                 break;
2238             case 0x2:
2239                 mpeg_decode_sequence_display_extension(s);
2240                 break;
2241             case 0x3:
2242                 mpeg_decode_quant_matrix_extension(s2);
2243                 break;
2244             case 0x7:
2245                 mpeg_decode_picture_display_extension(s);
2246                 break;
2247             case 0x8:
2248                 if (last_code == PICTURE_START_CODE) {
2249                     mpeg_decode_picture_coding_extension(s);
2250                 } else {
2251                     av_log(avctx, AV_LOG_ERROR, "ignoring pic cod ext after %X\n", last_code);
2252                     if (avctx->err_recognition & AV_EF_EXPLODE)
2253                         return AVERROR_INVALIDDATA;
2254                 }
2255                 break;
2256             }
2257             break;
2258         case USER_START_CODE:
2259             mpeg_decode_user_data(avctx, buf_ptr, input_size);
2260             break;
2261         case GOP_START_CODE:
2262             if (last_code == 0) {
2263                 s2->first_field=0;
2264                 mpeg_decode_gop(avctx, buf_ptr, input_size);
2265                 s->sync=1;
2266             } else {
2267                 av_log(avctx, AV_LOG_ERROR, "ignoring GOP_START_CODE after %X\n", last_code);
2268                 if (avctx->err_recognition & AV_EF_EXPLODE)
2269                     return AVERROR_INVALIDDATA;
2270             }
2271             break;
2272         default:
2273             if (start_code >= SLICE_MIN_START_CODE &&
2274                 start_code <= SLICE_MAX_START_CODE && last_code == PICTURE_START_CODE) {
2275
2276                 if (s2->progressive_sequence && !s2->progressive_frame) {
2277                     s2->progressive_frame = 1;
2278                     av_log(s2->avctx, AV_LOG_ERROR, "interlaced frame in progressive sequence, ignoring\n");
2279                 }
2280
2281                 if (s2->picture_structure == 0 || (s2->progressive_frame && s2->picture_structure != PICT_FRAME)) {
2282                     av_log(s2->avctx, AV_LOG_ERROR, "picture_structure %d invalid, ignoring\n", s2->picture_structure);
2283                     s2->picture_structure = PICT_FRAME;
2284                 }
2285
2286                 if (s2->progressive_sequence && !s2->frame_pred_frame_dct) {
2287                     av_log(s2->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
2288                 }
2289
2290                 if (s2->picture_structure == PICT_FRAME) {
2291                     s2->first_field = 0;
2292                     s2->v_edge_pos  = 16 * s2->mb_height;
2293                 } else {
2294                     s2->first_field ^= 1;
2295                     s2->v_edge_pos   = 8 * s2->mb_height;
2296                     memset(s2->mbskip_table, 0, s2->mb_stride * s2->mb_height);
2297                 }
2298             }
2299             if (start_code >= SLICE_MIN_START_CODE &&
2300                 start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2301                 const int field_pic = s2->picture_structure != PICT_FRAME;
2302                 int mb_y = start_code - SLICE_MIN_START_CODE;
2303                 last_code = SLICE_MIN_START_CODE;
2304                 if(s2->codec_id != AV_CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
2305                     mb_y += (*buf_ptr&0xE0)<<2;
2306
2307                 mb_y <<= field_pic;
2308                 if (s2->picture_structure == PICT_BOTTOM_FIELD)
2309                     mb_y++;
2310
2311                 if (mb_y >= s2->mb_height) {
2312                     av_log(s2->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2313                     return -1;
2314                 }
2315
2316                 if (s2->last_picture_ptr == NULL) {
2317                 /* Skip B-frames if we do not have reference frames and gop is not closed */
2318                     if (s2->pict_type == AV_PICTURE_TYPE_B) {
2319                         if (!s2->closed_gop) {
2320                             skip_frame = 1;
2321                             break;
2322                         }
2323                     }
2324                 }
2325                 if (s2->pict_type == AV_PICTURE_TYPE_I || (s2->flags2 & CODEC_FLAG2_SHOW_ALL))
2326                     s->sync=1;
2327                 if (s2->next_picture_ptr == NULL) {
2328                 /* Skip P-frames if we do not have a reference frame or we have an invalid header. */
2329                     if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
2330                         skip_frame = 1;
2331                         break;
2332                     }
2333                 }
2334                 if ((avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type == AV_PICTURE_TYPE_B) ||
2335                     (avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type != AV_PICTURE_TYPE_I) ||
2336                      avctx->skip_frame >= AVDISCARD_ALL) {
2337                     skip_frame = 1;
2338                     break;
2339                 }
2340
2341                 if (!s->mpeg_enc_ctx_allocated)
2342                     break;
2343
2344                 if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2345                     if (mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
2346                         break;
2347                 }
2348
2349                 if (!s2->pict_type) {
2350                     av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2351                     if (avctx->err_recognition & AV_EF_EXPLODE)
2352                         return AVERROR_INVALIDDATA;
2353                     break;
2354                 }
2355
2356                 if (s2->first_slice) {
2357                     skip_frame = 0;
2358                     s2->first_slice = 0;
2359                     if (mpeg_field_start(s2, buf, buf_size) < 0)
2360                         return -1;
2361                 }
2362                 if (!s2->current_picture_ptr) {
2363                     av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
2364                     return AVERROR_INVALIDDATA;
2365                 }
2366
2367                 if (uses_vdpau(avctx)) {
2368                     s->slice_count++;
2369                     break;
2370                 }
2371
2372                 if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE)) {
2373                     int threshold = (s2->mb_height * s->slice_count +
2374                                      s2->slice_context_count / 2) /
2375                                     s2->slice_context_count;
2376                     av_assert0(avctx->thread_count > 1);
2377                     if (threshold <= mb_y) {
2378                         MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2379
2380                         thread_context->start_mb_y = mb_y;
2381                         thread_context->end_mb_y   = s2->mb_height;
2382                         if (s->slice_count) {
2383                             s2->thread_context[s->slice_count-1]->end_mb_y = mb_y;
2384                             ret = ff_update_duplicate_context(thread_context,
2385                                                               s2);
2386                             if (ret < 0)
2387                                 return ret;
2388                         }
2389                         init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2390                         s->slice_count++;
2391                     }
2392                     buf_ptr += 2; // FIXME add minimum number of bytes per slice
2393                 } else {
2394                     ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2395                     emms_c();
2396
2397                     if (ret < 0) {
2398                         if (avctx->err_recognition & AV_EF_EXPLODE)
2399                             return ret;
2400                         if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2401                             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);
2402                     } else {
2403                         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);
2404                     }
2405                 }
2406             }
2407             break;
2408         }
2409     }
2410 }
2411
2412 static int mpeg_decode_frame(AVCodecContext *avctx,
2413                              void *data, int *got_output,
2414                              AVPacket *avpkt)
2415 {
2416     const uint8_t *buf = avpkt->data;
2417     int ret;
2418     int buf_size = avpkt->size;
2419     Mpeg1Context *s = avctx->priv_data;
2420     AVFrame *picture = data;
2421     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2422     av_dlog(avctx, "fill_buffer\n");
2423
2424     if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2425         /* special case for last picture */
2426         if (s2->low_delay == 0 && s2->next_picture_ptr) {
2427             int ret = av_frame_ref(picture, &s2->next_picture_ptr->f);
2428             if (ret < 0)
2429                 return ret;
2430
2431             s2->next_picture_ptr = NULL;
2432
2433             *got_output = 1;
2434         }
2435         return buf_size;
2436     }
2437
2438     if (s2->flags & CODEC_FLAG_TRUNCATED) {
2439         int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size, NULL);
2440
2441         if (ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0)
2442             return buf_size;
2443     }
2444
2445     s2->codec_tag = avpriv_toupper4(avctx->codec_tag);
2446     if (s->mpeg_enc_ctx_allocated == 0 && (   s2->codec_tag == AV_RL32("VCR2")
2447                                            || s2->codec_tag == AV_RL32("BW10")
2448                                           ))
2449         vcr2_init_sequence(avctx);
2450
2451     s->slice_count = 0;
2452
2453     if (avctx->extradata && !s->extradata_decoded) {
2454         ret = decode_chunks(avctx, picture, got_output, avctx->extradata, avctx->extradata_size);
2455         if(*got_output) {
2456             av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
2457             *got_output = 0;
2458         }
2459         s->extradata_decoded = 1;
2460         if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) {
2461             s2->current_picture_ptr = NULL;
2462             return ret;
2463         }
2464     }
2465
2466     ret = decode_chunks(avctx, picture, got_output, buf, buf_size);
2467     if (ret<0 || *got_output)
2468         s2->current_picture_ptr = NULL;
2469
2470     return ret;
2471 }
2472
2473
2474 static void flush(AVCodecContext *avctx)
2475 {
2476     Mpeg1Context *s = avctx->priv_data;
2477
2478     s->sync=0;
2479
2480     ff_mpeg_flush(avctx);
2481 }
2482
2483 static av_cold int mpeg_decode_end(AVCodecContext *avctx)
2484 {
2485     Mpeg1Context *s = avctx->priv_data;
2486
2487     if (s->mpeg_enc_ctx_allocated)
2488         ff_MPV_common_end(&s->mpeg_enc_ctx);
2489     return 0;
2490 }
2491
2492 static const AVProfile mpeg2_video_profiles[] = {
2493     { FF_PROFILE_MPEG2_422,          "4:2:2"              },
2494     { FF_PROFILE_MPEG2_HIGH,         "High"               },
2495     { FF_PROFILE_MPEG2_SS,           "Spatially Scalable" },
2496     { FF_PROFILE_MPEG2_SNR_SCALABLE, "SNR Scalable"       },
2497     { FF_PROFILE_MPEG2_MAIN,         "Main"               },
2498     { FF_PROFILE_MPEG2_SIMPLE,       "Simple"             },
2499     { FF_PROFILE_RESERVED,           "Reserved"           },
2500     { FF_PROFILE_RESERVED,           "Reserved"           },
2501     { FF_PROFILE_UNKNOWN },
2502 };
2503
2504
2505 AVCodec ff_mpeg1video_decoder = {
2506     .name                  = "mpeg1video",
2507     .type                  = AVMEDIA_TYPE_VIDEO,
2508     .id                    = AV_CODEC_ID_MPEG1VIDEO,
2509     .priv_data_size        = sizeof(Mpeg1Context),
2510     .init                  = mpeg_decode_init,
2511     .close                 = mpeg_decode_end,
2512     .decode                = mpeg_decode_frame,
2513     .capabilities          = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2514                              CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2515                              CODEC_CAP_SLICE_THREADS,
2516     .flush                 = flush,
2517     .max_lowres            = 3,
2518     .long_name             = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2519     .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context)
2520 };
2521
2522 AVCodec ff_mpeg2video_decoder = {
2523     .name           = "mpeg2video",
2524     .type           = AVMEDIA_TYPE_VIDEO,
2525     .id             = AV_CODEC_ID_MPEG2VIDEO,
2526     .priv_data_size = sizeof(Mpeg1Context),
2527     .init           = mpeg_decode_init,
2528     .close          = mpeg_decode_end,
2529     .decode         = mpeg_decode_frame,
2530     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2531                       CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2532                       CODEC_CAP_SLICE_THREADS,
2533     .flush          = flush,
2534     .max_lowres     = 3,
2535     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2536     .profiles       = NULL_IF_CONFIG_SMALL(mpeg2_video_profiles),
2537 };
2538
2539 //legacy decoder
2540 AVCodec ff_mpegvideo_decoder = {
2541     .name           = "mpegvideo",
2542     .type           = AVMEDIA_TYPE_VIDEO,
2543     .id             = AV_CODEC_ID_MPEG2VIDEO,
2544     .priv_data_size = sizeof(Mpeg1Context),
2545     .init           = mpeg_decode_init,
2546     .close          = mpeg_decode_end,
2547     .decode         = mpeg_decode_frame,
2548     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
2549     .flush          = flush,
2550     .max_lowres     = 3,
2551     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2552 };
2553
2554 #if CONFIG_MPEG_XVMC_DECODER
2555 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx)
2556 {
2557     if (avctx->active_thread_type & FF_THREAD_SLICE)
2558         return -1;
2559     if (!(avctx->slice_flags & SLICE_FLAG_CODED_ORDER))
2560         return -1;
2561     if (!(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
2562         av_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2563     }
2564     mpeg_decode_init(avctx);
2565
2566     avctx->pix_fmt           = AV_PIX_FMT_XVMC_MPEG2_IDCT;
2567     avctx->xvmc_acceleration = 2; // 2 - the blocks are packed!
2568
2569     return 0;
2570 }
2571
2572 AVCodec ff_mpeg_xvmc_decoder = {
2573     .name           = "mpegvideo_xvmc",
2574     .type           = AVMEDIA_TYPE_VIDEO,
2575     .id             = AV_CODEC_ID_MPEG2VIDEO_XVMC,
2576     .priv_data_size = sizeof(Mpeg1Context),
2577     .init           = mpeg_mc_decode_init,
2578     .close          = mpeg_decode_end,
2579     .decode         = mpeg_decode_frame,
2580     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2581                       CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2582     .flush          = flush,
2583     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2584 };
2585
2586 #endif
2587
2588 #if CONFIG_MPEG_VDPAU_DECODER
2589 AVCodec ff_mpeg_vdpau_decoder = {
2590     .name           = "mpegvideo_vdpau",
2591     .type           = AVMEDIA_TYPE_VIDEO,
2592     .id             = AV_CODEC_ID_MPEG2VIDEO,
2593     .priv_data_size = sizeof(Mpeg1Context),
2594     .init           = mpeg_decode_init,
2595     .close          = mpeg_decode_end,
2596     .decode         = mpeg_decode_frame,
2597     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2598                       CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2599     .flush          = flush,
2600     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2601 };
2602 #endif
2603
2604 #if CONFIG_MPEG1_VDPAU_DECODER
2605 AVCodec ff_mpeg1_vdpau_decoder = {
2606     .name           = "mpeg1video_vdpau",
2607     .type           = AVMEDIA_TYPE_VIDEO,
2608     .id             = AV_CODEC_ID_MPEG1VIDEO,
2609     .priv_data_size = sizeof(Mpeg1Context),
2610     .init           = mpeg_decode_init,
2611     .close          = mpeg_decode_end,
2612     .decode         = mpeg_decode_frame,
2613     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
2614                       CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2615     .flush          = flush,
2616     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
2617 };
2618 #endif