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   1 /*
   2  * MPEG1/2 decoder
   3  * Copyright (c) 2000,2001 Fabrice Bellard.
   4  * Copyright (c) 2002-2004 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 mpeg12.c
  25  * MPEG1/2 decoder
  26  */
  27
  28 //#define DEBUG
  29 #include "avcodec.h"
  30 #include "dsputil.h"
  31 #include "mpegvideo.h"
  32
  33 #include "mpeg12.h"
  34 #include "mpeg12data.h"
  35 #include "mpeg12decdata.h"
  36 #include "bytestream.h"
  37
  38 //#undef NDEBUG
  39 //#include <assert.h>
  40
  41
  42 #define DC_VLC_BITS 9
  43 #define MV_VLC_BITS 9
  44 #define MBINCR_VLC_BITS 9
  45 #define MB_PAT_VLC_BITS 9
  46 #define MB_PTYPE_VLC_BITS 6
  47 #define MB_BTYPE_VLC_BITS 6
  48 #define TEX_VLC_BITS 9
  49
  50 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
  51                               DCTELEM *block,
  52                               int n);
  53 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
  54                               DCTELEM *block,
  55                               int n);
  56 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n);
  57 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
  58                                         DCTELEM *block,
  59                                         int n);
  60 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
  61                                     DCTELEM *block,
  62                                     int n);
  63 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s, DCTELEM *block, int n);
  64 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n);
  65 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred);
  66 static void exchange_uv(MpegEncContext *s);
  67
  68 extern int XVMC_field_start(MpegEncContext *s, AVCodecContext *avctx);
  69 extern int XVMC_field_end(MpegEncContext *s);
  70 extern void XVMC_pack_pblocks(MpegEncContext *s,int cbp);
  71 extern void XVMC_init_block(MpegEncContext *s);//set s->block
  72
  73 static const enum PixelFormat pixfmt_yuv_420[]= {PIX_FMT_YUV420P,-1};
  74 static const enum PixelFormat pixfmt_yuv_422[]= {PIX_FMT_YUV422P,-1};
  75 static const enum PixelFormat pixfmt_yuv_444[]= {PIX_FMT_YUV444P,-1};
  76 static const enum PixelFormat pixfmt_xvmc_mpg2_420[] = {
  77                                            PIX_FMT_XVMC_MPEG2_IDCT,
  78                                            PIX_FMT_XVMC_MPEG2_MC,
  79                                            -1};
  80
  81 uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
  82
  83 static void init_2d_vlc_rl(RLTable *rl, int use_static)
  84 {
  85     int i;
  86
  87     init_vlc(&rl->vlc, TEX_VLC_BITS, rl->n + 2,
  88              &rl->table_vlc[0][1], 4, 2,
  89              &rl->table_vlc[0][0], 4, 2, use_static);
  90
  91     if(use_static)
  92         rl->rl_vlc[0]= av_mallocz_static(rl->vlc.table_size*sizeof(RL_VLC_ELEM));
  93     else
  94         rl->rl_vlc[0]= av_malloc(rl->vlc.table_size*sizeof(RL_VLC_ELEM));
  95
  96     for(i=0; i<rl->vlc.table_size; i++){
  97         int code= rl->vlc.table[i][0];
  98         int len = rl->vlc.table[i][1];
  99         int level, run;
 100
 101         if(len==0){ // illegal code
 102             run= 65;
 103             level= MAX_LEVEL;
 104         }else if(len<0){ //more bits needed
 105             run= 0;
 106             level= code;
 107         }else{
 108             if(code==rl->n){ //esc
 109                 run= 65;
 110                 level= 0;
 111             }else if(code==rl->n+1){ //eob
 112                 run= 0;
 113                 level= 127;
 114             }else{
 115                 run=   rl->table_run  [code] + 1;
 116                 level= rl->table_level[code];
 117             }
 118         }
 119         rl->rl_vlc[0][i].len= len;
 120         rl->rl_vlc[0][i].level= level;
 121         rl->rl_vlc[0][i].run= run;
 122     }
 123 }
 124
 125 void ff_mpeg12_common_init(MpegEncContext *s)
 126 {
 127
 128     s->y_dc_scale_table=
 129     s->c_dc_scale_table= mpeg2_dc_scale_table[s->intra_dc_precision];
 130
 131 }
 132
 133 void ff_mpeg1_clean_buffers(MpegEncContext *s){
 134     s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
 135     s->last_dc[1] = s->last_dc[0];
 136     s->last_dc[2] = s->last_dc[0];
 137     memset(s->last_mv, 0, sizeof(s->last_mv));
 138 }
 139
 140
 141 /******************************************/
 142 /* decoding */
 143
 144 static VLC dc_lum_vlc;
 145 static VLC dc_chroma_vlc;
 146 static VLC mv_vlc;
 147 static VLC mbincr_vlc;
 148 static VLC mb_ptype_vlc;
 149 static VLC mb_btype_vlc;
 150 static VLC mb_pat_vlc;
 151
 152 static void init_vlcs(void)
 153 {
 154     static int done = 0;
 155
 156     if (!done) {
 157         done = 1;
 158
 159         init_vlc(&dc_lum_vlc, DC_VLC_BITS, 12,
 160                  ff_mpeg12_vlc_dc_lum_bits, 1, 1,
 161                  ff_mpeg12_vlc_dc_lum_code, 2, 2, 1);
 162         init_vlc(&dc_chroma_vlc,  DC_VLC_BITS, 12,
 163                  ff_mpeg12_vlc_dc_chroma_bits, 1, 1,
 164                  ff_mpeg12_vlc_dc_chroma_code, 2, 2, 1);
 165         init_vlc(&mv_vlc, MV_VLC_BITS, 17,
 166                  &ff_mpeg12_mbMotionVectorTable[0][1], 2, 1,
 167                  &ff_mpeg12_mbMotionVectorTable[0][0], 2, 1, 1);
 168         init_vlc(&mbincr_vlc, MBINCR_VLC_BITS, 36,
 169                  &ff_mpeg12_mbAddrIncrTable[0][1], 2, 1,
 170                  &ff_mpeg12_mbAddrIncrTable[0][0], 2, 1, 1);
 171         init_vlc(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
 172                  &ff_mpeg12_mbPatTable[0][1], 2, 1,
 173                  &ff_mpeg12_mbPatTable[0][0], 2, 1, 1);
 174
 175         init_vlc(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
 176                  &table_mb_ptype[0][1], 2, 1,
 177                  &table_mb_ptype[0][0], 2, 1, 1);
 178         init_vlc(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
 179                  &table_mb_btype[0][1], 2, 1,
 180                  &table_mb_btype[0][0], 2, 1, 1);
 181         init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
 182         init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
 183
 184         init_2d_vlc_rl(&ff_rl_mpeg1, 1);
 185         init_2d_vlc_rl(&ff_rl_mpeg2, 1);
 186     }
 187 }
 188
 189 static inline int get_dmv(MpegEncContext *s)
 190 {
 191     if(get_bits1(&s->gb))
 192         return 1 - (get_bits1(&s->gb) << 1);
 193     else
 194         return 0;
 195 }
 196
 197 static inline int get_qscale(MpegEncContext *s)
 198 {
 199     int qscale = get_bits(&s->gb, 5);
 200     if (s->q_scale_type) {
 201         return non_linear_qscale[qscale];
 202     } else {
 203         return qscale << 1;
 204     }
 205 }
 206
 207 /* motion type (for mpeg2) */
 208 #define MT_FIELD 1
 209 #define MT_FRAME 2
 210 #define MT_16X8  2
 211 #define MT_DMV   3
 212
 213 static int mpeg_decode_mb(MpegEncContext *s,
 214                           DCTELEM block[12][64])
 215 {
 216     int i, j, k, cbp, val, mb_type, motion_type;
 217     const int mb_block_count = 4 + (1<< s->chroma_format);
 218
 219     dprintf(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
 220
 221     assert(s->mb_skipped==0);
 222
 223     if (s->mb_skip_run-- != 0) {
 224         if(s->pict_type == I_TYPE){
 225             av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
 226             return -1;
 227         }
 228
 229         /* skip mb */
 230         s->mb_intra = 0;
 231         for(i=0;i<12;i++)
 232             s->block_last_index[i] = -1;
 233         if(s->picture_structure == PICT_FRAME)
 234             s->mv_type = MV_TYPE_16X16;
 235         else
 236             s->mv_type = MV_TYPE_FIELD;
 237         if (s->pict_type == P_TYPE) {
 238             /* if P type, zero motion vector is implied */
 239             s->mv_dir = MV_DIR_FORWARD;
 240             s->mv[0][0][0] = s->mv[0][0][1] = 0;
 241             s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
 242             s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
 243             s->field_select[0][0]= s->picture_structure - 1;
 244             s->mb_skipped = 1;
 245             s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
 246         } else {
 247             int mb_type;
 248
 249             if(s->mb_x)
 250                 mb_type= s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1];
 251             else
 252                 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,
 253             if(IS_INTRA(mb_type))
 254                 return -1;
 255
 256             /* if B type, reuse previous vectors and directions */
 257             s->mv[0][0][0] = s->last_mv[0][0][0];
 258             s->mv[0][0][1] = s->last_mv[0][0][1];
 259             s->mv[1][0][0] = s->last_mv[1][0][0];
 260             s->mv[1][0][1] = s->last_mv[1][0][1];
 261
 262             s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]=
 263                 mb_type | MB_TYPE_SKIP;
 264 //            assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
 265
 266             if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0)
 267                 s->mb_skipped = 1;
 268         }
 269
 270         return 0;
 271     }
 272
 273     switch(s->pict_type) {
 274     default:
 275     case I_TYPE:
 276         if (get_bits1(&s->gb) == 0) {
 277             if (get_bits1(&s->gb) == 0){
 278                 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
 279                 return -1;
 280             }
 281             mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
 282         } else {
 283             mb_type = MB_TYPE_INTRA;
 284         }
 285         break;
 286     case P_TYPE:
 287         mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
 288         if (mb_type < 0){
 289             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
 290             return -1;
 291         }
 292         mb_type = ptype2mb_type[ mb_type ];
 293         break;
 294     case B_TYPE:
 295         mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
 296         if (mb_type < 0){
 297             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
 298             return -1;
 299         }
 300         mb_type = btype2mb_type[ mb_type ];
 301         break;
 302     }
 303     dprintf(s->avctx, "mb_type=%x\n", mb_type);
 304 //    motion_type = 0; /* avoid warning */
 305     if (IS_INTRA(mb_type)) {
 306         s->dsp.clear_blocks(s->block[0]);
 307
 308         if(!s->chroma_y_shift){
 309             s->dsp.clear_blocks(s->block[6]);
 310         }
 311
 312         /* compute dct type */
 313         if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
 314             !s->frame_pred_frame_dct) {
 315             s->interlaced_dct = get_bits1(&s->gb);
 316         }
 317
 318         if (IS_QUANT(mb_type))
 319             s->qscale = get_qscale(s);
 320
 321         if (s->concealment_motion_vectors) {
 322             /* just parse them */
 323             if (s->picture_structure != PICT_FRAME)
 324                 skip_bits1(&s->gb); /* field select */
 325
 326             s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
 327                 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
 328             s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
 329                 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
 330
 331             skip_bits1(&s->gb); /* marker */
 332         }else
 333             memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
 334         s->mb_intra = 1;
 335 #ifdef HAVE_XVMC
 336         //one 1 we memcpy blocks in xvmcvideo
 337         if(s->avctx->xvmc_acceleration > 1){
 338             XVMC_pack_pblocks(s,-1);//inter are always full blocks
 339             if(s->swap_uv){
 340                 exchange_uv(s);
 341             }
 342         }
 343 #endif
 344
 345         if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
 346             if(s->flags2 & CODEC_FLAG2_FAST){
 347                 for(i=0;i<6;i++) {
 348                     mpeg2_fast_decode_block_intra(s, s->pblocks[i], i);
 349                 }
 350             }else{
 351                 for(i=0;i<mb_block_count;i++) {
 352                     if (mpeg2_decode_block_intra(s, s->pblocks[i], i) < 0)
 353                         return -1;
 354                 }
 355             }
 356         } else {
 357             for(i=0;i<6;i++) {
 358                 if (mpeg1_decode_block_intra(s, s->pblocks[i], i) < 0)
 359                     return -1;
 360             }
 361         }
 362     } else {
 363         if (mb_type & MB_TYPE_ZERO_MV){
 364             assert(mb_type & MB_TYPE_CBP);
 365
 366             /* compute dct type */
 367             if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
 368                 !s->frame_pred_frame_dct) {
 369                 s->interlaced_dct = get_bits1(&s->gb);
 370             }
 371
 372             if (IS_QUANT(mb_type))
 373                 s->qscale = get_qscale(s);
 374
 375             s->mv_dir = MV_DIR_FORWARD;
 376             if(s->picture_structure == PICT_FRAME)
 377                 s->mv_type = MV_TYPE_16X16;
 378             else{
 379                 s->mv_type = MV_TYPE_FIELD;
 380                 mb_type |= MB_TYPE_INTERLACED;
 381                 s->field_select[0][0]= s->picture_structure - 1;
 382             }
 383             s->last_mv[0][0][0] = 0;
 384             s->last_mv[0][0][1] = 0;
 385             s->last_mv[0][1][0] = 0;
 386             s->last_mv[0][1][1] = 0;
 387             s->mv[0][0][0] = 0;
 388             s->mv[0][0][1] = 0;
 389         }else{
 390             assert(mb_type & MB_TYPE_L0L1);
 391 //FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
 392             /* get additional motion vector type */
 393             if (s->frame_pred_frame_dct)
 394                 motion_type = MT_FRAME;
 395             else{
 396                 motion_type = get_bits(&s->gb, 2);
 397             }
 398
 399             /* compute dct type */
 400             if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
 401                 !s->frame_pred_frame_dct && HAS_CBP(mb_type)) {
 402                 s->interlaced_dct = get_bits1(&s->gb);
 403             }
 404
 405             if (IS_QUANT(mb_type))
 406                 s->qscale = get_qscale(s);
 407
 408             /* motion vectors */
 409             s->mv_dir = 0;
 410             for(i=0;i<2;i++) {
 411                 if (USES_LIST(mb_type, i)) {
 412                     s->mv_dir |= (MV_DIR_FORWARD >> i);
 413                     dprintf(s->avctx, "motion_type=%d\n", motion_type);
 414                     switch(motion_type) {
 415                     case MT_FRAME: /* or MT_16X8 */
 416                         if (s->picture_structure == PICT_FRAME) {
 417                             /* MT_FRAME */
 418                             mb_type |= MB_TYPE_16x16;
 419                             s->mv_type = MV_TYPE_16X16;
 420                             s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
 421                                 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
 422                             s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
 423                                 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
 424                             /* full_pel: only for mpeg1 */
 425                             if (s->full_pel[i]){
 426                                 s->mv[i][0][0] <<= 1;
 427                                 s->mv[i][0][1] <<= 1;
 428                             }
 429                         } else {
 430                             /* MT_16X8 */
 431                             mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
 432                             s->mv_type = MV_TYPE_16X8;
 433                             for(j=0;j<2;j++) {
 434                                 s->field_select[i][j] = get_bits1(&s->gb);
 435                                 for(k=0;k<2;k++) {
 436                                     val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
 437                                                              s->last_mv[i][j][k]);
 438                                     s->last_mv[i][j][k] = val;
 439                                     s->mv[i][j][k] = val;
 440                                 }
 441                             }
 442                         }
 443                         break;
 444                     case MT_FIELD:
 445                         s->mv_type = MV_TYPE_FIELD;
 446                         if (s->picture_structure == PICT_FRAME) {
 447                             mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
 448                             for(j=0;j<2;j++) {
 449                                 s->field_select[i][j] = get_bits1(&s->gb);
 450                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
 451                                                          s->last_mv[i][j][0]);
 452                                 s->last_mv[i][j][0] = val;
 453                                 s->mv[i][j][0] = val;
 454                                 dprintf(s->avctx, "fmx=%d\n", val);
 455                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
 456                                                          s->last_mv[i][j][1] >> 1);
 457                                 s->last_mv[i][j][1] = val << 1;
 458                                 s->mv[i][j][1] = val;
 459                                 dprintf(s->avctx, "fmy=%d\n", val);
 460                             }
 461                         } else {
 462                             mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
 463                             s->field_select[i][0] = get_bits1(&s->gb);
 464                             for(k=0;k<2;k++) {
 465                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
 466                                                          s->last_mv[i][0][k]);
 467                                 s->last_mv[i][0][k] = val;
 468                                 s->last_mv[i][1][k] = val;
 469                                 s->mv[i][0][k] = val;
 470                             }
 471                         }
 472                         break;
 473                     case MT_DMV:
 474                         {
 475                             int dmx, dmy, mx, my, m;
 476
 477                             mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
 478                                                     s->last_mv[i][0][0]);
 479                             s->last_mv[i][0][0] = mx;
 480                             s->last_mv[i][1][0] = mx;
 481                             dmx = get_dmv(s);
 482                             my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
 483                                                     s->last_mv[i][0][1] >> 1);
 484                             dmy = get_dmv(s);
 485                             s->mv_type = MV_TYPE_DMV;
 486
 487
 488                             s->last_mv[i][0][1] = my<<1;
 489                             s->last_mv[i][1][1] = my<<1;
 490
 491                             s->mv[i][0][0] = mx;
 492                             s->mv[i][0][1] = my;
 493                             s->mv[i][1][0] = mx;//not used
 494                             s->mv[i][1][1] = my;//not used
 495
 496                             if (s->picture_structure == PICT_FRAME) {
 497                                 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
 498
 499                                 //m = 1 + 2 * s->top_field_first;
 500                                 m = s->top_field_first ? 1 : 3;
 501
 502                                 /* top -> top pred */
 503                                 s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
 504                                 s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
 505                                 m = 4 - m;
 506                                 s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
 507                                 s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
 508                             } else {
 509                                 mb_type |= MB_TYPE_16x16;
 510
 511                                 s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
 512                                 s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
 513                                 if(s->picture_structure == PICT_TOP_FIELD)
 514                                     s->mv[i][2][1]--;
 515                                 else
 516                                     s->mv[i][2][1]++;
 517                             }
 518                         }
 519                         break;
 520                     default:
 521                         av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
 522                         return -1;
 523                     }
 524                 }
 525             }
 526         }
 527
 528         s->mb_intra = 0;
 529         if (HAS_CBP(mb_type)) {
 530             s->dsp.clear_blocks(s->block[0]);
 531
 532             if(!s->chroma_y_shift){
 533                 s->dsp.clear_blocks(s->block[6]);
 534             }
 535
 536             cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
 537             if (cbp < 0 || ((cbp == 0) && (s->chroma_format < 2)) ){
 538                 av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
 539                 return -1;
 540             }
 541             if(mb_block_count > 6){
 542                  cbp<<= mb_block_count-6;
 543                  cbp |= get_bits(&s->gb, mb_block_count-6);
 544             }
 545
 546 #ifdef HAVE_XVMC
 547             //on 1 we memcpy blocks in xvmcvideo
 548             if(s->avctx->xvmc_acceleration > 1){
 549                 XVMC_pack_pblocks(s,cbp);
 550                 if(s->swap_uv){
 551                     exchange_uv(s);
 552                 }
 553             }
 554 #endif
 555
 556             if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
 557                 if(s->flags2 & CODEC_FLAG2_FAST){
 558                     for(i=0;i<6;i++) {
 559                         if(cbp & 32) {
 560                             mpeg2_fast_decode_block_non_intra(s, s->pblocks[i], i);
 561                         } else {
 562                             s->block_last_index[i] = -1;
 563                         }
 564                         cbp+=cbp;
 565                     }
 566                 }else{
 567                     cbp<<= 12-mb_block_count;
 568
 569                     for(i=0;i<mb_block_count;i++) {
 570                         if ( cbp & (1<<11) ) {
 571                             if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
 572                                 return -1;
 573                         } else {
 574                             s->block_last_index[i] = -1;
 575                         }
 576                         cbp+=cbp;
 577                     }
 578                 }
 579             } else {
 580                 if(s->flags2 & CODEC_FLAG2_FAST){
 581                     for(i=0;i<6;i++) {
 582                         if (cbp & 32) {
 583                             mpeg1_fast_decode_block_inter(s, s->pblocks[i], i);
 584                         } else {
 585                             s->block_last_index[i] = -1;
 586                         }
 587                         cbp+=cbp;
 588                     }
 589                 }else{
 590                     for(i=0;i<6;i++) {
 591                         if (cbp & 32) {
 592                             if (mpeg1_decode_block_inter(s, s->pblocks[i], i) < 0)
 593                                 return -1;
 594                         } else {
 595                             s->block_last_index[i] = -1;
 596                         }
 597                         cbp+=cbp;
 598                     }
 599                 }
 600             }
 601         }else{
 602             for(i=0;i<12;i++)
 603                 s->block_last_index[i] = -1;
 604         }
 605     }
 606
 607     s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
 608
 609     return 0;
 610 }
 611
 612 /* as h263, but only 17 codes */
 613 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
 614 {
 615     int code, sign, val, l, shift;
 616
 617     code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
 618     if (code == 0) {
 619         return pred;
 620     }
 621     if (code < 0) {
 622         return 0xffff;
 623     }
 624
 625     sign = get_bits1(&s->gb);
 626     shift = fcode - 1;
 627     val = code;
 628     if (shift) {
 629         val = (val - 1) << shift;
 630         val |= get_bits(&s->gb, shift);
 631         val++;
 632     }
 633     if (sign)
 634         val = -val;
 635     val += pred;
 636
 637     /* modulo decoding */
 638     l= INT_BIT - 5 - shift;
 639     val = (val<<l)>>l;
 640     return val;
 641 }
 642
 643 static inline int decode_dc(GetBitContext *gb, int component)
 644 {
 645     int code, diff;
 646
 647     if (component == 0) {
 648         code = get_vlc2(gb, dc_lum_vlc.table, DC_VLC_BITS, 2);
 649     } else {
 650         code = get_vlc2(gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);
 651     }
 652     if (code < 0){
 653         av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n");
 654         return 0xffff;
 655     }
 656     if (code == 0) {
 657         diff = 0;
 658     } else {
 659         diff = get_xbits(gb, code);
 660     }
 661     return diff;
 662 }
 663
 664 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
 665                                DCTELEM *block,
 666                                int n)
 667 {
 668     int level, dc, diff, i, j, run;
 669     int component;
 670     RLTable *rl = &ff_rl_mpeg1;
 671     uint8_t * const scantable= s->intra_scantable.permutated;
 672     const uint16_t *quant_matrix= s->intra_matrix;
 673     const int qscale= s->qscale;
 674
 675     /* DC coef */
 676     component = (n <= 3 ? 0 : n - 4 + 1);
 677     diff = decode_dc(&s->gb, component);
 678     if (diff >= 0xffff)
 679         return -1;
 680     dc = s->last_dc[component];
 681     dc += diff;
 682     s->last_dc[component] = dc;
 683     block[0] = dc<<3;
 684     dprintf(s->avctx, "dc=%d diff=%d\n", dc, diff);
 685     i = 0;
 686     {
 687         OPEN_READER(re, &s->gb);
 688         /* now quantify & encode AC coefs */
 689         for(;;) {
 690             UPDATE_CACHE(re, &s->gb);
 691             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
 692
 693             if(level == 127){
 694                 break;
 695             } else if(level != 0) {
 696                 i += run;
 697                 j = scantable[i];
 698                 level= (level*qscale*quant_matrix[j])>>4;
 699                 level= (level-1)|1;
 700                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
 701                 LAST_SKIP_BITS(re, &s->gb, 1);
 702             } else {
 703                 /* escape */
 704                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
 705                 UPDATE_CACHE(re, &s->gb);
 706                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
 707                 if (level == -128) {
 708                     level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
 709                 } else if (level == 0) {
 710                     level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
 711                 }
 712                 i += run;
 713                 j = scantable[i];
 714                 if(level<0){
 715                     level= -level;
 716                     level= (level*qscale*quant_matrix[j])>>4;
 717                     level= (level-1)|1;
 718                     level= -level;
 719                 }else{
 720                     level= (level*qscale*quant_matrix[j])>>4;
 721                     level= (level-1)|1;
 722                 }
 723             }
 724             if (i > 63){
 725                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
 726                 return -1;
 727             }
 728
 729             block[j] = level;
 730         }
 731         CLOSE_READER(re, &s->gb);
 732     }
 733     s->block_last_index[n] = i;
 734    return 0;
 735 }
 736
 737 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
 738                                DCTELEM *block,
 739                                int n)
 740 {
 741     int level, i, j, run;
 742     RLTable *rl = &ff_rl_mpeg1;
 743     uint8_t * const scantable= s->intra_scantable.permutated;
 744     const uint16_t *quant_matrix= s->inter_matrix;
 745     const int qscale= s->qscale;
 746
 747     {
 748         OPEN_READER(re, &s->gb);
 749         i = -1;
 750         /* special case for the first coef. no need to add a second vlc table */
 751         UPDATE_CACHE(re, &s->gb);
 752         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
 753             level= (3*qscale*quant_matrix[0])>>5;
 754             level= (level-1)|1;
 755             if(GET_CACHE(re, &s->gb)&0x40000000)
 756                 level= -level;
 757             block[0] = level;
 758             i++;
 759             SKIP_BITS(re, &s->gb, 2);
 760             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
 761                 goto end;
 762         }
 763
 764         /* now quantify & encode AC coefs */
 765         for(;;) {
 766             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
 767
 768             if(level != 0) {
 769                 i += run;
 770                 j = scantable[i];
 771                 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
 772                 level= (level-1)|1;
 773                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
 774                 SKIP_BITS(re, &s->gb, 1);
 775             } else {
 776                 /* escape */
 777                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
 778                 UPDATE_CACHE(re, &s->gb);
 779                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
 780                 if (level == -128) {
 781                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
 782                 } else if (level == 0) {
 783                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
 784                 }
 785                 i += run;
 786                 j = scantable[i];
 787                 if(level<0){
 788                     level= -level;
 789                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
 790                     level= (level-1)|1;
 791                     level= -level;
 792                 }else{
 793                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
 794                     level= (level-1)|1;
 795                 }
 796             }
 797             if (i > 63){
 798                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
 799                 return -1;
 800             }
 801
 802             block[j] = level;
 803             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
 804                 break;
 805             UPDATE_CACHE(re, &s->gb);
 806         }
 807 end:
 808         LAST_SKIP_BITS(re, &s->gb, 2);
 809         CLOSE_READER(re, &s->gb);
 810     }
 811     s->block_last_index[n] = i;
 812     return 0;
 813 }
 814
 815 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
 816 {
 817     int level, i, j, run;
 818     RLTable *rl = &ff_rl_mpeg1;
 819     uint8_t * const scantable= s->intra_scantable.permutated;
 820     const int qscale= s->qscale;
 821
 822     {
 823         OPEN_READER(re, &s->gb);
 824         i = -1;
 825         /* special case for the first coef. no need to add a second vlc table */
 826         UPDATE_CACHE(re, &s->gb);
 827         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
 828             level= (3*qscale)>>1;
 829             level= (level-1)|1;
 830             if(GET_CACHE(re, &s->gb)&0x40000000)
 831                 level= -level;
 832             block[0] = level;
 833             i++;
 834             SKIP_BITS(re, &s->gb, 2);
 835             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
 836                 goto end;
 837         }
 838
 839         /* now quantify & encode AC coefs */
 840         for(;;) {
 841             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
 842
 843             if(level != 0) {
 844                 i += run;
 845                 j = scantable[i];
 846                 level= ((level*2+1)*qscale)>>1;
 847                 level= (level-1)|1;
 848                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
 849                 SKIP_BITS(re, &s->gb, 1);
 850             } else {
 851                 /* escape */
 852                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
 853                 UPDATE_CACHE(re, &s->gb);
 854                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
 855                 if (level == -128) {
 856                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
 857                 } else if (level == 0) {
 858                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
 859                 }
 860                 i += run;
 861                 j = scantable[i];
 862                 if(level<0){
 863                     level= -level;
 864                     level= ((level*2+1)*qscale)>>1;
 865                     level= (level-1)|1;
 866                     level= -level;
 867                 }else{
 868                     level= ((level*2+1)*qscale)>>1;
 869                     level= (level-1)|1;
 870                 }
 871             }
 872
 873             block[j] = level;
 874             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
 875                 break;
 876             UPDATE_CACHE(re, &s->gb);
 877         }
 878 end:
 879         LAST_SKIP_BITS(re, &s->gb, 2);
 880         CLOSE_READER(re, &s->gb);
 881     }
 882     s->block_last_index[n] = i;
 883     return 0;
 884 }
 885
 886
 887 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
 888                                DCTELEM *block,
 889                                int n)
 890 {
 891     int level, i, j, run;
 892     RLTable *rl = &ff_rl_mpeg1;
 893     uint8_t * const scantable= s->intra_scantable.permutated;
 894     const uint16_t *quant_matrix;
 895     const int qscale= s->qscale;
 896     int mismatch;
 897
 898     mismatch = 1;
 899
 900     {
 901         OPEN_READER(re, &s->gb);
 902         i = -1;
 903         if (n < 4)
 904             quant_matrix = s->inter_matrix;
 905         else
 906             quant_matrix = s->chroma_inter_matrix;
 907
 908         /* special case for the first coef. no need to add a second vlc table */
 909         UPDATE_CACHE(re, &s->gb);
 910         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
 911             level= (3*qscale*quant_matrix[0])>>5;
 912             if(GET_CACHE(re, &s->gb)&0x40000000)
 913                 level= -level;
 914             block[0] = level;
 915             mismatch ^= level;
 916             i++;
 917             SKIP_BITS(re, &s->gb, 2);
 918             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
 919                 goto end;
 920         }
 921
 922         /* now quantify & encode AC coefs */
 923         for(;;) {
 924             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
 925
 926             if(level != 0) {
 927                 i += run;
 928                 j = scantable[i];
 929                 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
 930                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
 931                 SKIP_BITS(re, &s->gb, 1);
 932             } else {
 933                 /* escape */
 934                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
 935                 UPDATE_CACHE(re, &s->gb);
 936                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
 937
 938                 i += run;
 939                 j = scantable[i];
 940                 if(level<0){
 941                     level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
 942                     level= -level;
 943                 }else{
 944                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
 945                 }
 946             }
 947             if (i > 63){
 948                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
 949                 return -1;
 950             }
 951
 952             mismatch ^= level;
 953             block[j] = level;
 954             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
 955                 break;
 956             UPDATE_CACHE(re, &s->gb);
 957         }
 958 end:
 959         LAST_SKIP_BITS(re, &s->gb, 2);
 960         CLOSE_READER(re, &s->gb);
 961     }
 962     block[63] ^= (mismatch & 1);
 963
 964     s->block_last_index[n] = i;
 965     return 0;
 966 }
 967
 968 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
 969                                DCTELEM *block,
 970                                int n)
 971 {
 972     int level, i, j, run;
 973     RLTable *rl = &ff_rl_mpeg1;
 974     uint8_t * const scantable= s->intra_scantable.permutated;
 975     const int qscale= s->qscale;
 976     OPEN_READER(re, &s->gb);
 977     i = -1;
 978
 979     /* special case for the first coef. no need to add a second vlc table */
 980     UPDATE_CACHE(re, &s->gb);
 981     if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
 982         level= (3*qscale)>>1;
 983         if(GET_CACHE(re, &s->gb)&0x40000000)
 984             level= -level;
 985         block[0] = level;
 986         i++;
 987         SKIP_BITS(re, &s->gb, 2);
 988         if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
 989             goto end;
 990     }
 991
 992     /* now quantify & encode AC coefs */
 993     for(;;) {
 994         GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
 995
 996         if(level != 0) {
 997             i += run;
 998             j = scantable[i];
 999             level= ((level*2+1)*qscale)>>1;
1000             level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1001             SKIP_BITS(re, &s->gb, 1);
1002         } else {
1003             /* escape */
1004             run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1005             UPDATE_CACHE(re, &s->gb);
1006             level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1007
1008             i += run;
1009             j = scantable[i];
1010             if(level<0){
1011                 level= ((-level*2+1)*qscale)>>1;
1012                 level= -level;
1013             }else{
1014                 level= ((level*2+1)*qscale)>>1;
1015             }
1016         }
1017
1018         block[j] = level;
1019         if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1020             break;
1021         UPDATE_CACHE(re, &s->gb);
1022     }
1023 end:
1024     LAST_SKIP_BITS(re, &s->gb, 2);
1025     CLOSE_READER(re, &s->gb);
1026     s->block_last_index[n] = i;
1027     return 0;
1028 }
1029
1030
1031 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
1032                                DCTELEM *block,
1033                                int n)
1034 {
1035     int level, dc, diff, i, j, run;
1036     int component;
1037     RLTable *rl;
1038     uint8_t * const scantable= s->intra_scantable.permutated;
1039     const uint16_t *quant_matrix;
1040     const int qscale= s->qscale;
1041     int mismatch;
1042
1043     /* DC coef */
1044     if (n < 4){
1045         quant_matrix = s->intra_matrix;
1046         component = 0;
1047     }else{
1048         quant_matrix = s->chroma_intra_matrix;
1049         component = (n&1) + 1;
1050     }
1051     diff = decode_dc(&s->gb, component);
1052     if (diff >= 0xffff)
1053         return -1;
1054     dc = s->last_dc[component];
1055     dc += diff;
1056     s->last_dc[component] = dc;
1057     block[0] = dc << (3 - s->intra_dc_precision);
1058     dprintf(s->avctx, "dc=%d\n", block[0]);
1059     mismatch = block[0] ^ 1;
1060     i = 0;
1061     if (s->intra_vlc_format)
1062         rl = &ff_rl_mpeg2;
1063     else
1064         rl = &ff_rl_mpeg1;
1065
1066     {
1067         OPEN_READER(re, &s->gb);
1068         /* now quantify & encode AC coefs */
1069         for(;;) {
1070             UPDATE_CACHE(re, &s->gb);
1071             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1072
1073             if(level == 127){
1074                 break;
1075             } else if(level != 0) {
1076                 i += run;
1077                 j = scantable[i];
1078                 level= (level*qscale*quant_matrix[j])>>4;
1079                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1080                 LAST_SKIP_BITS(re, &s->gb, 1);
1081             } else {
1082                 /* escape */
1083                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1084                 UPDATE_CACHE(re, &s->gb);
1085                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1086                 i += run;
1087                 j = scantable[i];
1088                 if(level<0){
1089                     level= (-level*qscale*quant_matrix[j])>>4;
1090                     level= -level;
1091                 }else{
1092                     level= (level*qscale*quant_matrix[j])>>4;
1093                 }
1094             }
1095             if (i > 63){
1096                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1097                 return -1;
1098             }
1099
1100             mismatch^= level;
1101             block[j] = level;
1102         }
1103         CLOSE_READER(re, &s->gb);
1104     }
1105     block[63]^= mismatch&1;
1106
1107     s->block_last_index[n] = i;
1108     return 0;
1109 }
1110
1111 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
1112                                DCTELEM *block,
1113                                int n)
1114 {
1115     int level, dc, diff, j, run;
1116     int component;
1117     RLTable *rl;
1118     uint8_t * scantable= s->intra_scantable.permutated;
1119     const uint16_t *quant_matrix;
1120     const int qscale= s->qscale;
1121
1122     /* DC coef */
1123     if (n < 4){
1124         quant_matrix = s->intra_matrix;
1125         component = 0;
1126     }else{
1127         quant_matrix = s->chroma_intra_matrix;
1128         component = (n&1) + 1;
1129     }
1130     diff = decode_dc(&s->gb, component);
1131     if (diff >= 0xffff)
1132         return -1;
1133     dc = s->last_dc[component];
1134     dc += diff;
1135     s->last_dc[component] = dc;
1136     block[0] = dc << (3 - s->intra_dc_precision);
1137     if (s->intra_vlc_format)
1138         rl = &ff_rl_mpeg2;
1139     else
1140         rl = &ff_rl_mpeg1;
1141
1142     {
1143         OPEN_READER(re, &s->gb);
1144         /* now quantify & encode AC coefs */
1145         for(;;) {
1146             UPDATE_CACHE(re, &s->gb);
1147             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1148
1149             if(level == 127){
1150                 break;
1151             } else if(level != 0) {
1152                 scantable += run;
1153                 j = *scantable;
1154                 level= (level*qscale*quant_matrix[j])>>4;
1155                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1156                 LAST_SKIP_BITS(re, &s->gb, 1);
1157             } else {
1158                 /* escape */
1159                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1160                 UPDATE_CACHE(re, &s->gb);
1161                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1162                 scantable += run;
1163                 j = *scantable;
1164                 if(level<0){
1165                     level= (-level*qscale*quant_matrix[j])>>4;
1166                     level= -level;
1167                 }else{
1168                     level= (level*qscale*quant_matrix[j])>>4;
1169                 }
1170             }
1171
1172             block[j] = level;
1173         }
1174         CLOSE_READER(re, &s->gb);
1175     }
1176
1177     s->block_last_index[n] = scantable - s->intra_scantable.permutated;
1178     return 0;
1179 }
1180
1181 typedef struct Mpeg1Context {
1182     MpegEncContext mpeg_enc_ctx;
1183     int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
1184     int repeat_field; /* true if we must repeat the field */
1185     AVPanScan pan_scan; /** some temporary storage for the panscan */
1186     int slice_count;
1187     int swap_uv;//indicate VCR2
1188     int save_aspect_info;
1189     int save_width, save_height;
1190     AVRational frame_rate_ext;       ///< MPEG-2 specific framerate modificator
1191
1192 } Mpeg1Context;
1193
1194 static int mpeg_decode_init(AVCodecContext *avctx)
1195 {
1196     Mpeg1Context *s = avctx->priv_data;
1197     MpegEncContext *s2 = &s->mpeg_enc_ctx;
1198     int i;
1199
1200     //we need some parmutation to store
1201     //matrixes, until MPV_common_init()
1202     //set the real permutatuon
1203     for(i=0;i<64;i++)
1204        s2->dsp.idct_permutation[i]=i;
1205
1206     MPV_decode_defaults(s2);
1207
1208     s->mpeg_enc_ctx.avctx= avctx;
1209     s->mpeg_enc_ctx.flags= avctx->flags;
1210     s->mpeg_enc_ctx.flags2= avctx->flags2;
1211     ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1212     init_vlcs();
1213
1214     s->mpeg_enc_ctx_allocated = 0;
1215     s->mpeg_enc_ctx.picture_number = 0;
1216     s->repeat_field = 0;
1217     s->mpeg_enc_ctx.codec_id= avctx->codec->id;
1218     return 0;
1219 }
1220
1221 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1222                                      const uint8_t *new_perm){
1223     uint16_t temp_matrix[64];
1224     int i;
1225
1226     memcpy(temp_matrix,matrix,64*sizeof(uint16_t));
1227
1228     for(i=0;i<64;i++){
1229         matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1230     }
1231 }
1232
1233 //Call this function when we know all parameters
1234 //it may be called in different places for mpeg1 and mpeg2
1235 static int mpeg_decode_postinit(AVCodecContext *avctx){
1236     Mpeg1Context *s1 = avctx->priv_data;
1237     MpegEncContext *s = &s1->mpeg_enc_ctx;
1238     uint8_t old_permutation[64];
1239
1240     if (
1241         (s1->mpeg_enc_ctx_allocated == 0)||
1242         avctx->coded_width  != s->width ||
1243         avctx->coded_height != s->height||
1244         s1->save_width != s->width ||
1245         s1->save_height != s->height ||
1246         s1->save_aspect_info != s->aspect_ratio_info||
1247         0)
1248     {
1249
1250         if (s1->mpeg_enc_ctx_allocated) {
1251             ParseContext pc= s->parse_context;
1252             s->parse_context.buffer=0;
1253             MPV_common_end(s);
1254             s->parse_context= pc;
1255         }
1256
1257         if( (s->width == 0 )||(s->height == 0))
1258             return -2;
1259
1260         avcodec_set_dimensions(avctx, s->width, s->height);
1261         avctx->bit_rate = s->bit_rate;
1262         s1->save_aspect_info = s->aspect_ratio_info;
1263         s1->save_width = s->width;
1264         s1->save_height = s->height;
1265
1266      //low_delay may be forced, in this case we will have B frames
1267      //that behave like P frames
1268         avctx->has_b_frames = !(s->low_delay);
1269
1270         if(avctx->sub_id==1){//s->codec_id==avctx->codec_id==CODEC_ID
1271             //mpeg1 fps
1272             avctx->time_base.den= ff_frame_rate_tab[s->frame_rate_index].num;
1273             avctx->time_base.num= ff_frame_rate_tab[s->frame_rate_index].den;
1274             //mpeg1 aspect
1275             avctx->sample_aspect_ratio= av_d2q(
1276                     1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1277
1278         }else{//mpeg2
1279         //mpeg2 fps
1280             av_reduce(
1281                 &s->avctx->time_base.den,
1282                 &s->avctx->time_base.num,
1283                 ff_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
1284                 ff_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1285                 1<<30);
1286         //mpeg2 aspect
1287             if(s->aspect_ratio_info > 1){
1288                 if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) ){
1289                     s->avctx->sample_aspect_ratio=
1290                         av_div_q(
1291                          ff_mpeg2_aspect[s->aspect_ratio_info],
1292                          (AVRational){s->width, s->height}
1293                          );
1294                 }else{
1295                     s->avctx->sample_aspect_ratio=
1296                         av_div_q(
1297                          ff_mpeg2_aspect[s->aspect_ratio_info],
1298                          (AVRational){s1->pan_scan.width, s1->pan_scan.height}
1299                         );
1300                 }
1301             }else{
1302                 s->avctx->sample_aspect_ratio=
1303                     ff_mpeg2_aspect[s->aspect_ratio_info];
1304             }
1305         }//mpeg2
1306
1307         if(avctx->xvmc_acceleration){
1308             avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
1309         }else{
1310             if(s->chroma_format <  2){
1311                 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
1312             }else
1313             if(s->chroma_format == 2){
1314                 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_422);
1315             }else
1316             if(s->chroma_format >  2){
1317                 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_444);
1318             }
1319         }
1320         //until then pix_fmt may be changed right after codec init
1321         if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
1322             if( avctx->idct_algo == FF_IDCT_AUTO )
1323                 avctx->idct_algo = FF_IDCT_SIMPLE;
1324
1325         //quantization matrixes may need reordering
1326         //if dct permutation is changed
1327         memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
1328
1329         if (MPV_common_init(s) < 0)
1330             return -2;
1331
1332         quant_matrix_rebuild(s->intra_matrix,       old_permutation,s->dsp.idct_permutation);
1333         quant_matrix_rebuild(s->inter_matrix,       old_permutation,s->dsp.idct_permutation);
1334         quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
1335         quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
1336
1337         s1->mpeg_enc_ctx_allocated = 1;
1338     }
1339     return 0;
1340 }
1341
1342 static int mpeg1_decode_picture(AVCodecContext *avctx,
1343                                 const uint8_t *buf, int buf_size)
1344 {
1345     Mpeg1Context *s1 = avctx->priv_data;
1346     MpegEncContext *s = &s1->mpeg_enc_ctx;
1347     int ref, f_code, vbv_delay;
1348
1349     if(mpeg_decode_postinit(s->avctx) < 0)
1350        return -2;
1351
1352     init_get_bits(&s->gb, buf, buf_size*8);
1353
1354     ref = get_bits(&s->gb, 10); /* temporal ref */
1355     s->pict_type = get_bits(&s->gb, 3);
1356     if(s->pict_type == 0 || s->pict_type > 3)
1357         return -1;
1358
1359     vbv_delay= get_bits(&s->gb, 16);
1360     if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
1361         s->full_pel[0] = get_bits1(&s->gb);
1362         f_code = get_bits(&s->gb, 3);
1363         if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
1364             return -1;
1365         s->mpeg_f_code[0][0] = f_code;
1366         s->mpeg_f_code[0][1] = f_code;
1367     }
1368     if (s->pict_type == B_TYPE) {
1369         s->full_pel[1] = get_bits1(&s->gb);
1370         f_code = get_bits(&s->gb, 3);
1371         if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
1372             return -1;
1373         s->mpeg_f_code[1][0] = f_code;
1374         s->mpeg_f_code[1][1] = f_code;
1375     }
1376     s->current_picture.pict_type= s->pict_type;
1377     s->current_picture.key_frame= s->pict_type == I_TYPE;
1378
1379     if(avctx->debug & FF_DEBUG_PICT_INFO)
1380         av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1381
1382     s->y_dc_scale = 8;
1383     s->c_dc_scale = 8;
1384     s->first_slice = 1;
1385     return 0;
1386 }
1387
1388 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1389 {
1390     MpegEncContext *s= &s1->mpeg_enc_ctx;
1391     int horiz_size_ext, vert_size_ext;
1392     int bit_rate_ext;
1393
1394     skip_bits(&s->gb, 1); /* profil and level esc*/
1395     s->avctx->profile= get_bits(&s->gb, 3);
1396     s->avctx->level= get_bits(&s->gb, 4);
1397     s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1398     s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1399     horiz_size_ext = get_bits(&s->gb, 2);
1400     vert_size_ext = get_bits(&s->gb, 2);
1401     s->width |= (horiz_size_ext << 12);
1402     s->height |= (vert_size_ext << 12);
1403     bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1404     s->bit_rate += (bit_rate_ext << 18) * 400;
1405     skip_bits1(&s->gb); /* marker */
1406     s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
1407
1408     s->low_delay = get_bits1(&s->gb);
1409     if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
1410
1411     s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
1412     s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;
1413
1414     dprintf(s->avctx, "sequence extension\n");
1415     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
1416     s->avctx->sub_id = 2; /* indicates mpeg2 found */
1417
1418     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1419         av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1420                s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
1421
1422 }
1423
1424 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1425 {
1426     MpegEncContext *s= &s1->mpeg_enc_ctx;
1427     int color_description, w, h;
1428
1429     skip_bits(&s->gb, 3); /* video format */
1430     color_description= get_bits1(&s->gb);
1431     if(color_description){
1432         skip_bits(&s->gb, 8); /* color primaries */
1433         skip_bits(&s->gb, 8); /* transfer_characteristics */
1434         skip_bits(&s->gb, 8); /* matrix_coefficients */
1435     }
1436     w= get_bits(&s->gb, 14);
1437     skip_bits(&s->gb, 1); //marker
1438     h= get_bits(&s->gb, 14);
1439     skip_bits(&s->gb, 1); //marker
1440
1441     s1->pan_scan.width= 16*w;
1442     s1->pan_scan.height=16*h;
1443
1444     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1445         av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1446 }
1447
1448 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1449 {
1450     MpegEncContext *s= &s1->mpeg_enc_ctx;
1451     int i,nofco;
1452
1453     nofco = 1;
1454     if(s->progressive_sequence){
1455         if(s->repeat_first_field){
1456             nofco++;
1457             if(s->top_field_first)
1458                 nofco++;
1459         }
1460     }else{
1461         if(s->picture_structure == PICT_FRAME){
1462             nofco++;
1463             if(s->repeat_first_field)
1464                 nofco++;
1465         }
1466     }
1467     for(i=0; i<nofco; i++){
1468         s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
1469         skip_bits(&s->gb, 1); //marker
1470         s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
1471         skip_bits(&s->gb, 1); //marker
1472     }
1473
1474     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1475         av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1476             s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1477             s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1478             s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
1479         );
1480 }
1481
1482 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1483 {
1484     int i, v, j;
1485
1486     dprintf(s->avctx, "matrix extension\n");
1487
1488     if (get_bits1(&s->gb)) {
1489         for(i=0;i<64;i++) {
1490             v = get_bits(&s->gb, 8);
1491             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1492             s->intra_matrix[j] = v;
1493             s->chroma_intra_matrix[j] = v;
1494         }
1495     }
1496     if (get_bits1(&s->gb)) {
1497         for(i=0;i<64;i++) {
1498             v = get_bits(&s->gb, 8);
1499             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1500             s->inter_matrix[j] = v;
1501             s->chroma_inter_matrix[j] = v;
1502         }
1503     }
1504     if (get_bits1(&s->gb)) {
1505         for(i=0;i<64;i++) {
1506             v = get_bits(&s->gb, 8);
1507             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1508             s->chroma_intra_matrix[j] = v;
1509         }
1510     }
1511     if (get_bits1(&s->gb)) {
1512         for(i=0;i<64;i++) {
1513             v = get_bits(&s->gb, 8);
1514             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1515             s->chroma_inter_matrix[j] = v;
1516         }
1517     }
1518 }
1519
1520 static void mpeg_decode_picture_coding_extension(MpegEncContext *s)
1521 {
1522     s->full_pel[0] = s->full_pel[1] = 0;
1523     s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1524     s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1525     s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1526     s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1527     s->intra_dc_precision = get_bits(&s->gb, 2);
1528     s->picture_structure = get_bits(&s->gb, 2);
1529     s->top_field_first = get_bits1(&s->gb);
1530     s->frame_pred_frame_dct = get_bits1(&s->gb);
1531     s->concealment_motion_vectors = get_bits1(&s->gb);
1532     s->q_scale_type = get_bits1(&s->gb);
1533     s->intra_vlc_format = get_bits1(&s->gb);
1534     s->alternate_scan = get_bits1(&s->gb);
1535     s->repeat_first_field = get_bits1(&s->gb);
1536     s->chroma_420_type = get_bits1(&s->gb);
1537     s->progressive_frame = get_bits1(&s->gb);
1538
1539     if(s->picture_structure == PICT_FRAME){
1540         s->first_field=0;
1541         s->v_edge_pos= 16*s->mb_height;
1542     }else{
1543         s->first_field ^= 1;
1544         s->v_edge_pos=  8*s->mb_height;
1545         memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
1546     }
1547
1548     if(s->alternate_scan){
1549         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_alternate_vertical_scan);
1550         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_alternate_vertical_scan);
1551     }else{
1552         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_zigzag_direct);
1553         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_zigzag_direct);
1554     }
1555
1556     /* composite display not parsed */
1557     dprintf(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1558     dprintf(s->avctx, "picture_structure=%d\n", s->picture_structure);
1559     dprintf(s->avctx, "top field first=%d\n", s->top_field_first);
1560     dprintf(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1561     dprintf(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1562     dprintf(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1563     dprintf(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1564     dprintf(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1565     dprintf(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1566 }
1567
1568 static void mpeg_decode_extension(AVCodecContext *avctx,
1569                                   const uint8_t *buf, int buf_size)
1570 {
1571     Mpeg1Context *s1 = avctx->priv_data;
1572     MpegEncContext *s = &s1->mpeg_enc_ctx;
1573     int ext_type;
1574
1575     init_get_bits(&s->gb, buf, buf_size*8);
1576
1577     ext_type = get_bits(&s->gb, 4);
1578     switch(ext_type) {
1579     case 0x1:
1580         mpeg_decode_sequence_extension(s1);
1581         break;
1582     case 0x2:
1583         mpeg_decode_sequence_display_extension(s1);
1584         break;
1585     case 0x3:
1586         mpeg_decode_quant_matrix_extension(s);
1587         break;
1588     case 0x7:
1589         mpeg_decode_picture_display_extension(s1);
1590         break;
1591     case 0x8:
1592         mpeg_decode_picture_coding_extension(s);
1593         break;
1594     }
1595 }
1596
1597 static void exchange_uv(MpegEncContext *s){
1598     short * tmp = s->pblocks[4];
1599     s->pblocks[4] = s->pblocks[5];
1600     s->pblocks[5] = tmp;
1601 }
1602
1603 static int mpeg_field_start(MpegEncContext *s){
1604     AVCodecContext *avctx= s->avctx;
1605     Mpeg1Context *s1 = (Mpeg1Context*)s;
1606
1607     /* start frame decoding */
1608     if(s->first_field || s->picture_structure==PICT_FRAME){
1609         if(MPV_frame_start(s, avctx) < 0)
1610             return -1;
1611
1612         ff_er_frame_start(s);
1613
1614         /* first check if we must repeat the frame */
1615         s->current_picture_ptr->repeat_pict = 0;
1616         if (s->repeat_first_field) {
1617             if (s->progressive_sequence) {
1618                 if (s->top_field_first)
1619                     s->current_picture_ptr->repeat_pict = 4;
1620                 else
1621                     s->current_picture_ptr->repeat_pict = 2;
1622             } else if (s->progressive_frame) {
1623                 s->current_picture_ptr->repeat_pict = 1;
1624             }
1625         }
1626
1627         *s->current_picture_ptr->pan_scan= s1->pan_scan;
1628     }else{ //second field
1629             int i;
1630
1631             if(!s->current_picture_ptr){
1632                 av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1633                 return -1;
1634             }
1635
1636             for(i=0; i<4; i++){
1637                 s->current_picture.data[i] = s->current_picture_ptr->data[i];
1638                 if(s->picture_structure == PICT_BOTTOM_FIELD){
1639                     s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
1640                 }
1641             }
1642     }
1643 #ifdef HAVE_XVMC
1644 // MPV_frame_start will call this function too,
1645 // but we need to call it on every field
1646     if(s->avctx->xvmc_acceleration)
1647          XVMC_field_start(s,avctx);
1648 #endif
1649
1650     return 0;
1651 }
1652
1653 #define DECODE_SLICE_ERROR -1
1654 #define DECODE_SLICE_OK 0
1655
1656 /**
1657  * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
1658  * @return DECODE_SLICE_ERROR if the slice is damaged<br>
1659  *         DECODE_SLICE_OK if this slice is ok<br>
1660  */
1661 static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
1662                              const uint8_t **buf, int buf_size)
1663 {
1664     MpegEncContext *s = &s1->mpeg_enc_ctx;
1665     AVCodecContext *avctx= s->avctx;
1666     int ret;
1667     const int field_pic= s->picture_structure != PICT_FRAME;
1668     const int lowres= s->avctx->lowres;
1669
1670     s->resync_mb_x=
1671     s->resync_mb_y= -1;
1672
1673     if (mb_y<<field_pic >= s->mb_height){
1674         av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s->mb_height);
1675         return -1;
1676     }
1677
1678     init_get_bits(&s->gb, *buf, buf_size*8);
1679
1680     ff_mpeg1_clean_buffers(s);
1681     s->interlaced_dct = 0;
1682
1683     s->qscale = get_qscale(s);
1684
1685     if(s->qscale == 0){
1686         av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1687         return -1;
1688     }
1689
1690     /* extra slice info */
1691     while (get_bits1(&s->gb) != 0) {
1692         skip_bits(&s->gb, 8);
1693     }
1694
1695     s->mb_x=0;
1696
1697     for(;;) {
1698         int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1699         if (code < 0){
1700             av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1701             return -1;
1702         }
1703         if (code >= 33) {
1704             if (code == 33) {
1705                 s->mb_x += 33;
1706             }
1707             /* otherwise, stuffing, nothing to do */
1708         } else {
1709             s->mb_x += code;
1710             break;
1711         }
1712     }
1713     if(s->mb_x >= (unsigned)s->mb_width){
1714         av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1715         return -1;
1716     }
1717
1718     s->resync_mb_x= s->mb_x;
1719     s->resync_mb_y= s->mb_y= mb_y;
1720     s->mb_skip_run= 0;
1721     ff_init_block_index(s);
1722
1723     if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
1724         if(s->avctx->debug&FF_DEBUG_PICT_INFO){
1725              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",
1726                  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],
1727                  s->pict_type == I_TYPE ? "I" : (s->pict_type == P_TYPE ? "P" : (s->pict_type == B_TYPE ? "B" : "S")),
1728                  s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1729                  s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1730                  s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1731         }
1732     }
1733
1734     for(;;) {
1735 #ifdef HAVE_XVMC
1736         //one 1 we memcpy blocks in xvmcvideo
1737         if(s->avctx->xvmc_acceleration > 1)
1738             XVMC_init_block(s);//set s->block
1739 #endif
1740
1741         ret = mpeg_decode_mb(s, s->block);
1742         s->chroma_qscale= s->qscale;
1743
1744         dprintf(s->avctx, "ret=%d\n", ret);
1745         if (ret < 0)
1746             return -1;
1747
1748         if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
1749             const int wrap = field_pic ? 2*s->b8_stride : s->b8_stride;
1750             int xy = s->mb_x*2 + s->mb_y*2*wrap;
1751             int motion_x, motion_y, dir, i;
1752             if(field_pic && !s->first_field)
1753                 xy += wrap/2;
1754
1755             for(i=0; i<2; i++){
1756                 for(dir=0; dir<2; dir++){
1757                     if (s->mb_intra || (dir==1 && s->pict_type != B_TYPE)) {
1758                         motion_x = motion_y = 0;
1759                     }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
1760                         motion_x = s->mv[dir][0][0];
1761                         motion_y = s->mv[dir][0][1];
1762                     } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
1763                         motion_x = s->mv[dir][i][0];
1764                         motion_y = s->mv[dir][i][1];
1765                     }
1766
1767                     s->current_picture.motion_val[dir][xy    ][0] = motion_x;
1768                     s->current_picture.motion_val[dir][xy    ][1] = motion_y;
1769                     s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1770                     s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1771                     s->current_picture.ref_index [dir][xy    ]=
1772                     s->current_picture.ref_index [dir][xy + 1]= s->field_select[dir][i];
1773                     assert(s->field_select[dir][i]==0 || s->field_select[dir][i]==1);
1774                 }
1775                 xy += wrap;
1776             }
1777         }
1778
1779         s->dest[0] += 16 >> lowres;
1780         s->dest[1] += 16 >> (s->chroma_x_shift + lowres);
1781         s->dest[2] += 16 >> (s->chroma_x_shift + lowres);
1782
1783         MPV_decode_mb(s, s->block);
1784
1785         if (++s->mb_x >= s->mb_width) {
1786             const int mb_size= 16>>s->avctx->lowres;
1787
1788             ff_draw_horiz_band(s, mb_size*s->mb_y, mb_size);
1789
1790             s->mb_x = 0;
1791             s->mb_y++;
1792
1793             if(s->mb_y<<field_pic >= s->mb_height){
1794                 int left= s->gb.size_in_bits - get_bits_count(&s->gb);
1795                 int is_d10= s->chroma_format==2 && s->pict_type==I_TYPE && avctx->profile==0 && avctx->level==5
1796                             && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
1797                             && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
1798
1799                 if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
1800                    || (avctx->error_resilience >= FF_ER_AGGRESSIVE && left>8)){
1801                     av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
1802                     return -1;
1803                 }else
1804                     goto eos;
1805             }
1806
1807             ff_init_block_index(s);
1808         }
1809
1810         /* skip mb handling */
1811         if (s->mb_skip_run == -1) {
1812             /* read again increment */
1813             s->mb_skip_run = 0;
1814             for(;;) {
1815                 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1816                 if (code < 0){
1817                     av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1818                     return -1;
1819                 }
1820                 if (code >= 33) {
1821                     if (code == 33) {
1822                         s->mb_skip_run += 33;
1823                     }else if(code == 35){
1824                         if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
1825                             av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1826                             return -1;
1827                         }
1828                         goto eos; /* end of slice */
1829                     }
1830                     /* otherwise, stuffing, nothing to do */
1831                 } else {
1832                     s->mb_skip_run += code;
1833                     break;
1834                 }
1835             }
1836         }
1837     }
1838 eos: // end of slice
1839     *buf += get_bits_count(&s->gb)/8 - 1;
1840 //printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1841     return 0;
1842 }
1843
1844 static int slice_decode_thread(AVCodecContext *c, void *arg){
1845     MpegEncContext *s= arg;
1846     const uint8_t *buf= s->gb.buffer;
1847     int mb_y= s->start_mb_y;
1848
1849     s->error_count= 3*(s->end_mb_y - s->start_mb_y)*s->mb_width;
1850
1851     for(;;){
1852         uint32_t start_code;
1853         int ret;
1854
1855         ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
1856         emms_c();
1857 //av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1858 //ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, s->start_mb_y, s->end_mb_y, s->error_count);
1859         if(ret < 0){
1860             if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
1861                 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, AC_ERROR|DC_ERROR|MV_ERROR);
1862         }else{
1863             ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, AC_END|DC_END|MV_END);
1864         }
1865
1866         if(s->mb_y == s->end_mb_y)
1867             return 0;
1868
1869         start_code= -1;
1870         buf = ff_find_start_code(buf, s->gb.buffer_end, &start_code);
1871         mb_y= start_code - SLICE_MIN_START_CODE;
1872         if(mb_y < 0 || mb_y >= s->end_mb_y)
1873             return -1;
1874     }
1875
1876     return 0; //not reached
1877 }
1878
1879 /**
1880  * handles slice ends.
1881  * @return 1 if it seems to be the last slice of
1882  */
1883 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1884 {
1885     Mpeg1Context *s1 = avctx->priv_data;
1886     MpegEncContext *s = &s1->mpeg_enc_ctx;
1887
1888     if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1889         return 0;
1890
1891 #ifdef HAVE_XVMC
1892     if(s->avctx->xvmc_acceleration)
1893         XVMC_field_end(s);
1894 #endif
1895     /* end of slice reached */
1896     if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
1897         /* end of image */
1898
1899         s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
1900
1901         ff_er_frame_end(s);
1902
1903         MPV_frame_end(s);
1904
1905         if (s->pict_type == B_TYPE || s->low_delay) {
1906             *pict= *(AVFrame*)s->current_picture_ptr;
1907             ff_print_debug_info(s, pict);
1908         } else {
1909             s->picture_number++;
1910             /* latency of 1 frame for I and P frames */
1911             /* XXX: use another variable than picture_number */
1912             if (s->last_picture_ptr != NULL) {
1913                 *pict= *(AVFrame*)s->last_picture_ptr;
1914                  ff_print_debug_info(s, pict);
1915             }
1916         }
1917
1918         return 1;
1919     } else {
1920         return 0;
1921     }
1922 }
1923
1924 static int mpeg1_decode_sequence(AVCodecContext *avctx,
1925                                  const uint8_t *buf, int buf_size)
1926 {
1927     Mpeg1Context *s1 = avctx->priv_data;
1928     MpegEncContext *s = &s1->mpeg_enc_ctx;
1929     int width,height;
1930     int i, v, j;
1931
1932     init_get_bits(&s->gb, buf, buf_size*8);
1933
1934     width = get_bits(&s->gb, 12);
1935     height = get_bits(&s->gb, 12);
1936     if (width <= 0 || height <= 0 ||
1937         (width % 2) != 0 || (height % 2) != 0)
1938         return -1;
1939     s->aspect_ratio_info= get_bits(&s->gb, 4);
1940     if (s->aspect_ratio_info == 0)
1941         return -1;
1942     s->frame_rate_index = get_bits(&s->gb, 4);
1943     if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
1944         return -1;
1945     s->bit_rate = get_bits(&s->gb, 18) * 400;
1946     if (get_bits1(&s->gb) == 0) /* marker */
1947         return -1;
1948     s->width = width;
1949     s->height = height;
1950
1951     s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
1952     skip_bits(&s->gb, 1);
1953
1954     /* get matrix */
1955     if (get_bits1(&s->gb)) {
1956         for(i=0;i<64;i++) {
1957             v = get_bits(&s->gb, 8);
1958             if(v==0){
1959                 av_log(s->avctx, AV_LOG_ERROR, "intra matrix damaged\n");
1960                 return -1;
1961             }
1962             j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1963             s->intra_matrix[j] = v;
1964             s->chroma_intra_matrix[j] = v;
1965         }
1966 #ifdef DEBUG
1967         dprintf(s->avctx, "intra matrix present\n");
1968         for(i=0;i<64;i++)
1969             dprintf(s->avctx, " %d", s->intra_matrix[s->dsp.idct_permutation[i]]);
1970         dprintf(s->avctx, "\n");
1971 #endif
1972     } else {
1973         for(i=0;i<64;i++) {
1974             j = s->dsp.idct_permutation[i];
1975             v = ff_mpeg1_default_intra_matrix[i];
1976             s->intra_matrix[j] = v;
1977             s->chroma_intra_matrix[j] = v;
1978         }
1979     }
1980     if (get_bits1(&s->gb)) {
1981         for(i=0;i<64;i++) {
1982             v = get_bits(&s->gb, 8);
1983             if(v==0){
1984                 av_log(s->avctx, AV_LOG_ERROR, "inter matrix damaged\n");
1985                 return -1;
1986             }
1987             j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1988             s->inter_matrix[j] = v;
1989             s->chroma_inter_matrix[j] = v;
1990         }
1991 #ifdef DEBUG
1992         dprintf(s->avctx, "non intra matrix present\n");
1993         for(i=0;i<64;i++)
1994             dprintf(s->avctx, " %d", s->inter_matrix[s->dsp.idct_permutation[i]]);
1995         dprintf(s->avctx, "\n");
1996 #endif
1997     } else {
1998         for(i=0;i<64;i++) {
1999             int j= s->dsp.idct_permutation[i];
2000             v = ff_mpeg1_default_non_intra_matrix[i];
2001             s->inter_matrix[j] = v;
2002             s->chroma_inter_matrix[j] = v;
2003         }
2004     }
2005
2006     if(show_bits(&s->gb, 23) != 0){
2007         av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2008         return -1;
2009     }
2010
2011     /* we set mpeg2 parameters so that it emulates mpeg1 */
2012     s->progressive_sequence = 1;
2013     s->progressive_frame = 1;
2014     s->picture_structure = PICT_FRAME;
2015     s->frame_pred_frame_dct = 1;
2016     s->chroma_format = 1;
2017     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2018     avctx->sub_id = 1; /* indicates mpeg1 */
2019     s->out_format = FMT_MPEG1;
2020     s->swap_uv = 0;//AFAIK VCR2 don't have SEQ_HEADER
2021     if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2022
2023     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2024         av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2025                s->avctx->rc_buffer_size, s->bit_rate);
2026
2027     return 0;
2028 }
2029
2030 static int vcr2_init_sequence(AVCodecContext *avctx)
2031 {
2032     Mpeg1Context *s1 = avctx->priv_data;
2033     MpegEncContext *s = &s1->mpeg_enc_ctx;
2034     int i, v;
2035
2036     /* start new mpeg1 context decoding */
2037     s->out_format = FMT_MPEG1;
2038     if (s1->mpeg_enc_ctx_allocated) {
2039         MPV_common_end(s);
2040     }
2041     s->width  = avctx->coded_width;
2042     s->height = avctx->coded_height;
2043     avctx->has_b_frames= 0; //true?
2044     s->low_delay= 1;
2045
2046     if(avctx->xvmc_acceleration){
2047         avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2048     }else{
2049         avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2050     }
2051
2052     if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2053         if( avctx->idct_algo == FF_IDCT_AUTO )
2054             avctx->idct_algo = FF_IDCT_SIMPLE;
2055
2056     if (MPV_common_init(s) < 0)
2057         return -1;
2058     exchange_uv(s);//common init reset pblocks, so we swap them here
2059     s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB
2060     s1->mpeg_enc_ctx_allocated = 1;
2061
2062     for(i=0;i<64;i++) {
2063         int j= s->dsp.idct_permutation[i];
2064         v = ff_mpeg1_default_intra_matrix[i];
2065         s->intra_matrix[j] = v;
2066         s->chroma_intra_matrix[j] = v;
2067
2068         v = ff_mpeg1_default_non_intra_matrix[i];
2069         s->inter_matrix[j] = v;
2070         s->chroma_inter_matrix[j] = v;
2071     }
2072
2073     s->progressive_sequence = 1;
2074     s->progressive_frame = 1;
2075     s->picture_structure = PICT_FRAME;
2076     s->frame_pred_frame_dct = 1;
2077     s->chroma_format = 1;
2078     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2079     avctx->sub_id = 2; /* indicates mpeg2 */
2080     return 0;
2081 }
2082
2083
2084 static void mpeg_decode_user_data(AVCodecContext *avctx,
2085                                   const uint8_t *buf, int buf_size)
2086 {
2087     const uint8_t *p;
2088     int len, flags;
2089     p = buf;
2090     len = buf_size;
2091
2092     /* we parse the DTG active format information */
2093     if (len >= 5 &&
2094         p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2095         flags = p[4];
2096         p += 5;
2097         len -= 5;
2098         if (flags & 0x80) {
2099             /* skip event id */
2100             if (len < 2)
2101                 return;
2102             p += 2;
2103             len -= 2;
2104         }
2105         if (flags & 0x40) {
2106             if (len < 1)
2107                 return;
2108             avctx->dtg_active_format = p[0] & 0x0f;
2109         }
2110     }
2111 }
2112
2113 static void mpeg_decode_gop(AVCodecContext *avctx,
2114                             const uint8_t *buf, int buf_size){
2115     Mpeg1Context *s1 = avctx->priv_data;
2116     MpegEncContext *s = &s1->mpeg_enc_ctx;
2117
2118     int drop_frame_flag;
2119     int time_code_hours, time_code_minutes;
2120     int time_code_seconds, time_code_pictures;
2121     int broken_link;
2122
2123     init_get_bits(&s->gb, buf, buf_size*8);
2124
2125     drop_frame_flag = get_bits1(&s->gb);
2126
2127     time_code_hours=get_bits(&s->gb,5);
2128     time_code_minutes = get_bits(&s->gb,6);
2129     skip_bits1(&s->gb);//marker bit
2130     time_code_seconds = get_bits(&s->gb,6);
2131     time_code_pictures = get_bits(&s->gb,6);
2132
2133     /*broken_link indicate that after editing the
2134       reference frames of the first B-Frames after GOP I-Frame
2135       are missing (open gop)*/
2136     broken_link = get_bits1(&s->gb);
2137
2138     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2139         av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) broken_link=%d\n",
2140             time_code_hours, time_code_minutes, time_code_seconds,
2141             time_code_pictures, broken_link);
2142 }
2143 /**
2144  * finds the end of the current frame in the bitstream.
2145  * @return the position of the first byte of the next frame, or -1
2146  */
2147 int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
2148 {
2149     int i;
2150     uint32_t state= pc->state;
2151
2152     i=0;
2153     if(!pc->frame_start_found){
2154         for(i=0; i<buf_size; i++){
2155             i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
2156             if(state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
2157                 i++;
2158                 pc->frame_start_found=1;
2159                 break;
2160             }
2161         }
2162     }
2163
2164     if(pc->frame_start_found){
2165         /* EOF considered as end of frame */
2166         if (buf_size == 0)
2167             return 0;
2168         for(; i<buf_size; i++){
2169             i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
2170             if((state&0xFFFFFF00) == 0x100){
2171                 if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
2172                     pc->frame_start_found=0;
2173                     pc->state=-1;
2174                     return i-3;
2175                 }
2176             }
2177         }
2178     }
2179     pc->state= state;
2180     return END_NOT_FOUND;
2181 }
2182
2183 /* handle buffering and image synchronisation */
2184 static int mpeg_decode_frame(AVCodecContext *avctx,
2185                              void *data, int *data_size,
2186                              uint8_t *buf, int buf_size)
2187 {
2188     Mpeg1Context *s = avctx->priv_data;
2189     const uint8_t *buf_end;
2190     const uint8_t *buf_ptr;
2191     uint32_t start_code;
2192     int ret, input_size;
2193     AVFrame *picture = data;
2194     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2195     dprintf(avctx, "fill_buffer\n");
2196
2197     if (buf_size == 0) {
2198         /* special case for last picture */
2199         if (s2->low_delay==0 && s2->next_picture_ptr) {
2200             *picture= *(AVFrame*)s2->next_picture_ptr;
2201             s2->next_picture_ptr= NULL;
2202
2203             *data_size = sizeof(AVFrame);
2204         }
2205         return 0;
2206     }
2207
2208     if(s2->flags&CODEC_FLAG_TRUNCATED){
2209         int next= ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size);
2210
2211         if( ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
2212             return buf_size;
2213     }
2214
2215     buf_ptr = buf;
2216     buf_end = buf + buf_size;
2217
2218 #if 0
2219     if (s->repeat_field % 2 == 1) {
2220         s->repeat_field++;
2221         //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2222         //        s2->picture_number, s->repeat_field);
2223         if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
2224             *data_size = sizeof(AVPicture);
2225             goto the_end;
2226         }
2227     }
2228 #endif
2229
2230     if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == ff_get_fourcc("VCR2"))
2231         vcr2_init_sequence(avctx);
2232
2233     s->slice_count= 0;
2234
2235     for(;;) {
2236         /* find start next code */
2237         start_code = -1;
2238         buf_ptr = ff_find_start_code(buf_ptr,buf_end, &start_code);
2239         if (start_code > 0x1ff){
2240             if(s2->pict_type != B_TYPE || avctx->skip_frame <= AVDISCARD_DEFAULT){
2241                 if(avctx->thread_count > 1){
2242                     int i;
2243
2244                     avctx->execute(avctx, slice_decode_thread,  (void**)&(s2->thread_context[0]), NULL, s->slice_count);
2245                     for(i=0; i<s->slice_count; i++)
2246                         s2->error_count += s2->thread_context[i]->error_count;
2247                 }
2248                 if (slice_end(avctx, picture)) {
2249                     if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2250                         *data_size = sizeof(AVPicture);
2251                 }
2252             }
2253             return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2254         }
2255
2256         input_size = buf_end - buf_ptr;
2257
2258         if(avctx->debug & FF_DEBUG_STARTCODE){
2259             av_log(avctx, AV_LOG_DEBUG, "%3X at %zd left %d\n", start_code, buf_ptr-buf, input_size);
2260         }
2261
2262         /* prepare data for next start code */
2263         switch(start_code) {
2264         case SEQ_START_CODE:
2265             mpeg1_decode_sequence(avctx, buf_ptr,
2266                                     input_size);
2267             break;
2268
2269         case PICTURE_START_CODE:
2270             /* we have a complete image : we try to decompress it */
2271             mpeg1_decode_picture(avctx,
2272                                     buf_ptr, input_size);
2273             break;
2274         case EXT_START_CODE:
2275             mpeg_decode_extension(avctx,
2276                                     buf_ptr, input_size);
2277             break;
2278         case USER_START_CODE:
2279             mpeg_decode_user_data(avctx,
2280                                     buf_ptr, input_size);
2281             break;
2282         case GOP_START_CODE:
2283             s2->first_field=0;
2284             mpeg_decode_gop(avctx,
2285                                     buf_ptr, input_size);
2286             break;
2287         default:
2288             if (start_code >= SLICE_MIN_START_CODE &&
2289                 start_code <= SLICE_MAX_START_CODE) {
2290                 int mb_y= start_code - SLICE_MIN_START_CODE;
2291
2292                 if(s2->last_picture_ptr==NULL){
2293                 /* Skip B-frames if we do not have reference frames. */
2294                     if(s2->pict_type==B_TYPE) break;
2295                 /* Skip P-frames if we do not have reference frame no valid header. */
2296 //                    if(s2->pict_type==P_TYPE && s2->first_field && !s2->first_slice) break;
2297                 }
2298                 /* Skip B-frames if we are in a hurry. */
2299                 if(avctx->hurry_up && s2->pict_type==B_TYPE) break;
2300                 if(  (avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type==B_TYPE)
2301                     ||(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type!=I_TYPE)
2302                     || avctx->skip_frame >= AVDISCARD_ALL)
2303                     break;
2304                 /* Skip everything if we are in a hurry>=5. */
2305                 if(avctx->hurry_up>=5) break;
2306
2307                 if (!s->mpeg_enc_ctx_allocated) break;
2308
2309                 if(s2->codec_id == CODEC_ID_MPEG2VIDEO){
2310                     if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
2311                         break;
2312                 }
2313
2314                 if(s2->first_slice){
2315                     s2->first_slice=0;
2316                             if(mpeg_field_start(s2) < 0)
2317                         return -1;
2318                     }
2319                 if(!s2->current_picture_ptr){
2320                     av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
2321                     return -1;
2322                 }
2323
2324                 if(avctx->thread_count > 1){
2325                     int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
2326                     if(threshold <= mb_y){
2327                         MpegEncContext *thread_context= s2->thread_context[s->slice_count];
2328
2329                         thread_context->start_mb_y= mb_y;
2330                         thread_context->end_mb_y  = s2->mb_height;
2331                         if(s->slice_count){
2332                             s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
2333                             ff_update_duplicate_context(thread_context, s2);
2334                         }
2335                         init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2336                         s->slice_count++;
2337                     }
2338                     buf_ptr += 2; //FIXME add minimum num of bytes per slice
2339                 }else{
2340                     ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
2341                     emms_c();
2342
2343                     if(ret < 0){
2344                         if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
2345                             ff_er_add_slice(s2, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x, s2->mb_y, AC_ERROR|DC_ERROR|MV_ERROR);
2346                     }else{
2347                         ff_er_add_slice(s2, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x-1, s2->mb_y, AC_END|DC_END|MV_END);
2348                     }
2349                 }
2350             }
2351             break;
2352         }
2353     }
2354 }
2355
2356 static int mpeg_decode_end(AVCodecContext *avctx)
2357 {
2358     Mpeg1Context *s = avctx->priv_data;
2359
2360     if (s->mpeg_enc_ctx_allocated)
2361         MPV_common_end(&s->mpeg_enc_ctx);
2362     return 0;
2363 }
2364
2365 AVCodec mpeg1video_decoder = {
2366     "mpeg1video",
2367     CODEC_TYPE_VIDEO,
2368     CODEC_ID_MPEG1VIDEO,
2369     sizeof(Mpeg1Context),
2370     mpeg_decode_init,
2371     NULL,
2372     mpeg_decode_end,
2373     mpeg_decode_frame,
2374     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2375     .flush= ff_mpeg_flush,
2376 };
2377
2378 AVCodec mpeg2video_decoder = {
2379     "mpeg2video",
2380     CODEC_TYPE_VIDEO,
2381     CODEC_ID_MPEG2VIDEO,
2382     sizeof(Mpeg1Context),
2383     mpeg_decode_init,
2384     NULL,
2385     mpeg_decode_end,
2386     mpeg_decode_frame,
2387     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2388     .flush= ff_mpeg_flush,
2389 };
2390
2391 //legacy decoder
2392 AVCodec mpegvideo_decoder = {
2393     "mpegvideo",
2394     CODEC_TYPE_VIDEO,
2395     CODEC_ID_MPEG2VIDEO,
2396     sizeof(Mpeg1Context),
2397     mpeg_decode_init,
2398     NULL,
2399     mpeg_decode_end,
2400     mpeg_decode_frame,
2401     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2402     .flush= ff_mpeg_flush,
2403 };
2404
2405 #ifdef HAVE_XVMC
2406 static int mpeg_mc_decode_init(AVCodecContext *avctx){
2407     Mpeg1Context *s;
2408
2409     if( avctx->thread_count > 1)
2410         return -1;
2411     if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
2412         return -1;
2413     if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
2414         dprintf(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2415     }
2416     mpeg_decode_init(avctx);
2417     s = avctx->priv_data;
2418
2419     avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
2420     avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
2421
2422     return 0;
2423 }
2424
2425 AVCodec mpeg_xvmc_decoder = {
2426     "mpegvideo_xvmc",
2427     CODEC_TYPE_VIDEO,
2428     CODEC_ID_MPEG2VIDEO_XVMC,
2429     sizeof(Mpeg1Context),
2430     mpeg_mc_decode_init,
2431     NULL,
2432     mpeg_decode_end,
2433     mpeg_decode_frame,
2434     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2435     .flush= ff_mpeg_flush,
2436 };
2437
2438 #endif
2439
2440 /* this is ugly i know, but the alternative is too make
2441    hundreds of vars global and prefix them with ff_mpeg1_
2442    which is far uglier. */
2443 #include "mdec.c"