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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 == P_TYPE) {
 225             s->mb_skipped = 1;
 226             s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
 227         } else {
 228             int mb_type;
 229
 230             if(s->mb_x)
 231                 mb_type= s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1];
 232             else
 233                 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,
 234             if(IS_INTRA(mb_type))
 235                 return -1;
 236
 237             s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]=
 238                 mb_type | MB_TYPE_SKIP;
 239 //            assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
 240
 241             if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0)
 242                 s->mb_skipped = 1;
 243         }
 244
 245         return 0;
 246     }
 247
 248     switch(s->pict_type) {
 249     default:
 250     case I_TYPE:
 251         if (get_bits1(&s->gb) == 0) {
 252             if (get_bits1(&s->gb) == 0){
 253                 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
 254                 return -1;
 255             }
 256             mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
 257         } else {
 258             mb_type = MB_TYPE_INTRA;
 259         }
 260         break;
 261     case P_TYPE:
 262         mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
 263         if (mb_type < 0){
 264             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
 265             return -1;
 266         }
 267         mb_type = ptype2mb_type[ mb_type ];
 268         break;
 269     case B_TYPE:
 270         mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
 271         if (mb_type < 0){
 272             av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
 273             return -1;
 274         }
 275         mb_type = btype2mb_type[ mb_type ];
 276         break;
 277     }
 278     dprintf(s->avctx, "mb_type=%x\n", mb_type);
 279 //    motion_type = 0; /* avoid warning */
 280     if (IS_INTRA(mb_type)) {
 281         s->dsp.clear_blocks(s->block[0]);
 282
 283         if(!s->chroma_y_shift){
 284             s->dsp.clear_blocks(s->block[6]);
 285         }
 286
 287         /* compute dct type */
 288         if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
 289             !s->frame_pred_frame_dct) {
 290             s->interlaced_dct = get_bits1(&s->gb);
 291         }
 292
 293         if (IS_QUANT(mb_type))
 294             s->qscale = get_qscale(s);
 295
 296         if (s->concealment_motion_vectors) {
 297             /* just parse them */
 298             if (s->picture_structure != PICT_FRAME)
 299                 skip_bits1(&s->gb); /* field select */
 300
 301             s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
 302                 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
 303             s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
 304                 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
 305
 306             skip_bits1(&s->gb); /* marker */
 307         }else
 308             memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
 309         s->mb_intra = 1;
 310 #ifdef HAVE_XVMC
 311         //one 1 we memcpy blocks in xvmcvideo
 312         if(s->avctx->xvmc_acceleration > 1){
 313             XVMC_pack_pblocks(s,-1);//inter are always full blocks
 314             if(s->swap_uv){
 315                 exchange_uv(s);
 316             }
 317         }
 318 #endif
 319
 320         if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
 321             if(s->flags2 & CODEC_FLAG2_FAST){
 322                 for(i=0;i<6;i++) {
 323                     mpeg2_fast_decode_block_intra(s, s->pblocks[i], i);
 324                 }
 325             }else{
 326                 for(i=0;i<mb_block_count;i++) {
 327                     if (mpeg2_decode_block_intra(s, s->pblocks[i], i) < 0)
 328                         return -1;
 329                 }
 330             }
 331         } else {
 332             for(i=0;i<6;i++) {
 333                 if (mpeg1_decode_block_intra(s, s->pblocks[i], i) < 0)
 334                     return -1;
 335             }
 336         }
 337     } else {
 338         if (mb_type & MB_TYPE_ZERO_MV){
 339             assert(mb_type & MB_TYPE_CBP);
 340
 341             s->mv_dir = MV_DIR_FORWARD;
 342             if(s->picture_structure == PICT_FRAME){
 343                 if(!s->frame_pred_frame_dct)
 344                     s->interlaced_dct = get_bits1(&s->gb);
 345                 s->mv_type = MV_TYPE_16X16;
 346             }else{
 347                 s->mv_type = MV_TYPE_FIELD;
 348                 mb_type |= MB_TYPE_INTERLACED;
 349                 s->field_select[0][0]= s->picture_structure - 1;
 350             }
 351
 352             if (IS_QUANT(mb_type))
 353                 s->qscale = get_qscale(s);
 354
 355             s->last_mv[0][0][0] = 0;
 356             s->last_mv[0][0][1] = 0;
 357             s->last_mv[0][1][0] = 0;
 358             s->last_mv[0][1][1] = 0;
 359             s->mv[0][0][0] = 0;
 360             s->mv[0][0][1] = 0;
 361         }else{
 362             assert(mb_type & MB_TYPE_L0L1);
 363 //FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
 364             /* get additional motion vector type */
 365             if (s->frame_pred_frame_dct)
 366                 motion_type = MT_FRAME;
 367             else{
 368                 motion_type = get_bits(&s->gb, 2);
 369                 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
 370                     s->interlaced_dct = get_bits1(&s->gb);
 371             }
 372
 373             if (IS_QUANT(mb_type))
 374                 s->qscale = get_qscale(s);
 375
 376             /* motion vectors */
 377             s->mv_dir = 0;
 378             dprintf(s->avctx, "motion_type=%d\n", motion_type);
 379             switch(motion_type) {
 380             case MT_FRAME: /* or MT_16X8 */
 381                 if (s->picture_structure == PICT_FRAME) {
 382                     mb_type |= MB_TYPE_16x16;
 383                     s->mv_type = MV_TYPE_16X16;
 384                     for(i=0;i<2;i++) {
 385                         if (USES_LIST(mb_type, i)) {
 386                             s->mv_dir |= (MV_DIR_FORWARD << i);
 387                             /* MT_FRAME */
 388                             s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
 389                                 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
 390                             s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
 391                                 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
 392                             /* full_pel: only for mpeg1 */
 393                             if (s->full_pel[i]){
 394                                 s->mv[i][0][0] <<= 1;
 395                                 s->mv[i][0][1] <<= 1;
 396                             }
 397                         }
 398                     }
 399                 } else {
 400                     mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
 401                     s->mv_type = MV_TYPE_16X8;
 402                     for(i=0;i<2;i++) {
 403                         if (USES_LIST(mb_type, i)) {
 404                             s->mv_dir |= (MV_DIR_FORWARD << i);
 405                             /* MT_16X8 */
 406                             for(j=0;j<2;j++) {
 407                                 s->field_select[i][j] = get_bits1(&s->gb);
 408                                 for(k=0;k<2;k++) {
 409                                     val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
 410                                                              s->last_mv[i][j][k]);
 411                                     s->last_mv[i][j][k] = val;
 412                                     s->mv[i][j][k] = val;
 413                                 }
 414                             }
 415                         }
 416                     }
 417                 }
 418                 break;
 419             case MT_FIELD:
 420                 s->mv_type = MV_TYPE_FIELD;
 421                 if (s->picture_structure == PICT_FRAME) {
 422                     mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
 423                     for(i=0;i<2;i++) {
 424                         if (USES_LIST(mb_type, i)) {
 425                             s->mv_dir |= (MV_DIR_FORWARD << i);
 426                             for(j=0;j<2;j++) {
 427                                 s->field_select[i][j] = get_bits1(&s->gb);
 428                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
 429                                                          s->last_mv[i][j][0]);
 430                                 s->last_mv[i][j][0] = val;
 431                                 s->mv[i][j][0] = val;
 432                                 dprintf(s->avctx, "fmx=%d\n", val);
 433                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
 434                                                          s->last_mv[i][j][1] >> 1);
 435                                 s->last_mv[i][j][1] = val << 1;
 436                                 s->mv[i][j][1] = val;
 437                                 dprintf(s->avctx, "fmy=%d\n", val);
 438                             }
 439                         }
 440                     }
 441                 } else {
 442                     mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
 443                     for(i=0;i<2;i++) {
 444                         if (USES_LIST(mb_type, i)) {
 445                             s->mv_dir |= (MV_DIR_FORWARD << i);
 446                             s->field_select[i][0] = get_bits1(&s->gb);
 447                             for(k=0;k<2;k++) {
 448                                 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
 449                                                          s->last_mv[i][0][k]);
 450                                 s->last_mv[i][0][k] = val;
 451                                 s->last_mv[i][1][k] = val;
 452                                 s->mv[i][0][k] = val;
 453                             }
 454                         }
 455                     }
 456                 }
 457                 break;
 458             case MT_DMV:
 459                 s->mv_type = MV_TYPE_DMV;
 460                 for(i=0;i<2;i++) {
 461                     if (USES_LIST(mb_type, i)) {
 462                         int dmx, dmy, mx, my, m;
 463                         s->mv_dir |= (MV_DIR_FORWARD << i);
 464                         mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
 465                                                 s->last_mv[i][0][0]);
 466                         s->last_mv[i][0][0] = mx;
 467                         s->last_mv[i][1][0] = mx;
 468                         dmx = get_dmv(s);
 469                         my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
 470                                                 s->last_mv[i][0][1] >> 1);
 471                         dmy = get_dmv(s);
 472
 473
 474                         s->last_mv[i][0][1] = my<<1;
 475                         s->last_mv[i][1][1] = my<<1;
 476
 477                         s->mv[i][0][0] = mx;
 478                         s->mv[i][0][1] = my;
 479                         s->mv[i][1][0] = mx;//not used
 480                         s->mv[i][1][1] = my;//not used
 481
 482                         if (s->picture_structure == PICT_FRAME) {
 483                             mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
 484
 485                             //m = 1 + 2 * s->top_field_first;
 486                             m = s->top_field_first ? 1 : 3;
 487
 488                             /* top -> top pred */
 489                             s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
 490                             s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
 491                             m = 4 - m;
 492                             s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
 493                             s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
 494                         } else {
 495                             mb_type |= MB_TYPE_16x16;
 496
 497                             s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
 498                             s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
 499                             if(s->picture_structure == PICT_TOP_FIELD)
 500                                 s->mv[i][2][1]--;
 501                             else
 502                                 s->mv[i][2][1]++;
 503                         }
 504                     }
 505                 }
 506                 break;
 507             default:
 508                 av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
 509                 return -1;
 510             }
 511         }
 512
 513         s->mb_intra = 0;
 514         if (HAS_CBP(mb_type)) {
 515             s->dsp.clear_blocks(s->block[0]);
 516
 517             cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
 518             if(mb_block_count > 6){
 519                  cbp<<= mb_block_count-6;
 520                  cbp |= get_bits(&s->gb, mb_block_count-6);
 521                  s->dsp.clear_blocks(s->block[6]);
 522             }
 523             if (cbp <= 0){
 524                 av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
 525                 return -1;
 526             }
 527
 528 #ifdef HAVE_XVMC
 529             //on 1 we memcpy blocks in xvmcvideo
 530             if(s->avctx->xvmc_acceleration > 1){
 531                 XVMC_pack_pblocks(s,cbp);
 532                 if(s->swap_uv){
 533                     exchange_uv(s);
 534                 }
 535             }
 536 #endif
 537
 538             if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
 539                 if(s->flags2 & CODEC_FLAG2_FAST){
 540                     for(i=0;i<6;i++) {
 541                         if(cbp & 32) {
 542                             mpeg2_fast_decode_block_non_intra(s, s->pblocks[i], i);
 543                         } else {
 544                             s->block_last_index[i] = -1;
 545                         }
 546                         cbp+=cbp;
 547                     }
 548                 }else{
 549                     cbp<<= 12-mb_block_count;
 550
 551                     for(i=0;i<mb_block_count;i++) {
 552                         if ( cbp & (1<<11) ) {
 553                             if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
 554                                 return -1;
 555                         } else {
 556                             s->block_last_index[i] = -1;
 557                         }
 558                         cbp+=cbp;
 559                     }
 560                 }
 561             } else {
 562                 if(s->flags2 & CODEC_FLAG2_FAST){
 563                     for(i=0;i<6;i++) {
 564                         if (cbp & 32) {
 565                             mpeg1_fast_decode_block_inter(s, s->pblocks[i], i);
 566                         } else {
 567                             s->block_last_index[i] = -1;
 568                         }
 569                         cbp+=cbp;
 570                     }
 571                 }else{
 572                     for(i=0;i<6;i++) {
 573                         if (cbp & 32) {
 574                             if (mpeg1_decode_block_inter(s, s->pblocks[i], i) < 0)
 575                                 return -1;
 576                         } else {
 577                             s->block_last_index[i] = -1;
 578                         }
 579                         cbp+=cbp;
 580                     }
 581                 }
 582             }
 583         }else{
 584             for(i=0;i<12;i++)
 585                 s->block_last_index[i] = -1;
 586         }
 587     }
 588
 589     s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
 590
 591     return 0;
 592 }
 593
 594 /* as h263, but only 17 codes */
 595 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
 596 {
 597     int code, sign, val, l, shift;
 598
 599     code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
 600     if (code == 0) {
 601         return pred;
 602     }
 603     if (code < 0) {
 604         return 0xffff;
 605     }
 606
 607     sign = get_bits1(&s->gb);
 608     shift = fcode - 1;
 609     val = code;
 610     if (shift) {
 611         val = (val - 1) << shift;
 612         val |= get_bits(&s->gb, shift);
 613         val++;
 614     }
 615     if (sign)
 616         val = -val;
 617     val += pred;
 618
 619     /* modulo decoding */
 620     l= INT_BIT - 5 - shift;
 621     val = (val<<l)>>l;
 622     return val;
 623 }
 624
 625 static inline int decode_dc(GetBitContext *gb, int component)
 626 {
 627     int code, diff;
 628
 629     if (component == 0) {
 630         code = get_vlc2(gb, dc_lum_vlc.table, DC_VLC_BITS, 2);
 631     } else {
 632         code = get_vlc2(gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);
 633     }
 634     if (code < 0){
 635         av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n");
 636         return 0xffff;
 637     }
 638     if (code == 0) {
 639         diff = 0;
 640     } else {
 641         diff = get_xbits(gb, code);
 642     }
 643     return diff;
 644 }
 645
 646 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
 647                                DCTELEM *block,
 648                                int n)
 649 {
 650     int level, dc, diff, i, j, run;
 651     int component;
 652     RLTable *rl = &ff_rl_mpeg1;
 653     uint8_t * const scantable= s->intra_scantable.permutated;
 654     const uint16_t *quant_matrix= s->intra_matrix;
 655     const int qscale= s->qscale;
 656
 657     /* DC coef */
 658     component = (n <= 3 ? 0 : n - 4 + 1);
 659     diff = decode_dc(&s->gb, component);
 660     if (diff >= 0xffff)
 661         return -1;
 662     dc = s->last_dc[component];
 663     dc += diff;
 664     s->last_dc[component] = dc;
 665     block[0] = dc<<3;
 666     dprintf(s->avctx, "dc=%d diff=%d\n", dc, diff);
 667     i = 0;
 668     {
 669         OPEN_READER(re, &s->gb);
 670         /* now quantify & encode AC coefs */
 671         for(;;) {
 672             UPDATE_CACHE(re, &s->gb);
 673             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
 674
 675             if(level == 127){
 676                 break;
 677             } else if(level != 0) {
 678                 i += run;
 679                 j = scantable[i];
 680                 level= (level*qscale*quant_matrix[j])>>4;
 681                 level= (level-1)|1;
 682                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
 683                 LAST_SKIP_BITS(re, &s->gb, 1);
 684             } else {
 685                 /* escape */
 686                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
 687                 UPDATE_CACHE(re, &s->gb);
 688                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
 689                 if (level == -128) {
 690                     level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
 691                 } else if (level == 0) {
 692                     level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
 693                 }
 694                 i += run;
 695                 j = scantable[i];
 696                 if(level<0){
 697                     level= -level;
 698                     level= (level*qscale*quant_matrix[j])>>4;
 699                     level= (level-1)|1;
 700                     level= -level;
 701                 }else{
 702                     level= (level*qscale*quant_matrix[j])>>4;
 703                     level= (level-1)|1;
 704                 }
 705             }
 706             if (i > 63){
 707                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
 708                 return -1;
 709             }
 710
 711             block[j] = level;
 712         }
 713         CLOSE_READER(re, &s->gb);
 714     }
 715     s->block_last_index[n] = i;
 716    return 0;
 717 }
 718
 719 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
 720                                DCTELEM *block,
 721                                int n)
 722 {
 723     int level, i, j, run;
 724     RLTable *rl = &ff_rl_mpeg1;
 725     uint8_t * const scantable= s->intra_scantable.permutated;
 726     const uint16_t *quant_matrix= s->inter_matrix;
 727     const int qscale= s->qscale;
 728
 729     {
 730         OPEN_READER(re, &s->gb);
 731         i = -1;
 732         /* special case for the first coef. no need to add a second vlc table */
 733         UPDATE_CACHE(re, &s->gb);
 734         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
 735             level= (3*qscale*quant_matrix[0])>>5;
 736             level= (level-1)|1;
 737             if(GET_CACHE(re, &s->gb)&0x40000000)
 738                 level= -level;
 739             block[0] = level;
 740             i++;
 741             SKIP_BITS(re, &s->gb, 2);
 742             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
 743                 goto end;
 744         }
 745
 746         /* now quantify & encode AC coefs */
 747         for(;;) {
 748             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
 749
 750             if(level != 0) {
 751                 i += run;
 752                 j = scantable[i];
 753                 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
 754                 level= (level-1)|1;
 755                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
 756                 SKIP_BITS(re, &s->gb, 1);
 757             } else {
 758                 /* escape */
 759                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
 760                 UPDATE_CACHE(re, &s->gb);
 761                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
 762                 if (level == -128) {
 763                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
 764                 } else if (level == 0) {
 765                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
 766                 }
 767                 i += run;
 768                 j = scantable[i];
 769                 if(level<0){
 770                     level= -level;
 771                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
 772                     level= (level-1)|1;
 773                     level= -level;
 774                 }else{
 775                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
 776                     level= (level-1)|1;
 777                 }
 778             }
 779             if (i > 63){
 780                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
 781                 return -1;
 782             }
 783
 784             block[j] = level;
 785             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
 786                 break;
 787             UPDATE_CACHE(re, &s->gb);
 788         }
 789 end:
 790         LAST_SKIP_BITS(re, &s->gb, 2);
 791         CLOSE_READER(re, &s->gb);
 792     }
 793     s->block_last_index[n] = i;
 794     return 0;
 795 }
 796
 797 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
 798 {
 799     int level, i, j, run;
 800     RLTable *rl = &ff_rl_mpeg1;
 801     uint8_t * const scantable= s->intra_scantable.permutated;
 802     const int qscale= s->qscale;
 803
 804     {
 805         OPEN_READER(re, &s->gb);
 806         i = -1;
 807         /* special case for the first coef. no need to add a second vlc table */
 808         UPDATE_CACHE(re, &s->gb);
 809         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
 810             level= (3*qscale)>>1;
 811             level= (level-1)|1;
 812             if(GET_CACHE(re, &s->gb)&0x40000000)
 813                 level= -level;
 814             block[0] = level;
 815             i++;
 816             SKIP_BITS(re, &s->gb, 2);
 817             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
 818                 goto end;
 819         }
 820
 821         /* now quantify & encode AC coefs */
 822         for(;;) {
 823             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
 824
 825             if(level != 0) {
 826                 i += run;
 827                 j = scantable[i];
 828                 level= ((level*2+1)*qscale)>>1;
 829                 level= (level-1)|1;
 830                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
 831                 SKIP_BITS(re, &s->gb, 1);
 832             } else {
 833                 /* escape */
 834                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
 835                 UPDATE_CACHE(re, &s->gb);
 836                 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
 837                 if (level == -128) {
 838                     level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
 839                 } else if (level == 0) {
 840                     level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
 841                 }
 842                 i += run;
 843                 j = scantable[i];
 844                 if(level<0){
 845                     level= -level;
 846                     level= ((level*2+1)*qscale)>>1;
 847                     level= (level-1)|1;
 848                     level= -level;
 849                 }else{
 850                     level= ((level*2+1)*qscale)>>1;
 851                     level= (level-1)|1;
 852                 }
 853             }
 854
 855             block[j] = level;
 856             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
 857                 break;
 858             UPDATE_CACHE(re, &s->gb);
 859         }
 860 end:
 861         LAST_SKIP_BITS(re, &s->gb, 2);
 862         CLOSE_READER(re, &s->gb);
 863     }
 864     s->block_last_index[n] = i;
 865     return 0;
 866 }
 867
 868
 869 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
 870                                DCTELEM *block,
 871                                int n)
 872 {
 873     int level, i, j, run;
 874     RLTable *rl = &ff_rl_mpeg1;
 875     uint8_t * const scantable= s->intra_scantable.permutated;
 876     const uint16_t *quant_matrix;
 877     const int qscale= s->qscale;
 878     int mismatch;
 879
 880     mismatch = 1;
 881
 882     {
 883         OPEN_READER(re, &s->gb);
 884         i = -1;
 885         if (n < 4)
 886             quant_matrix = s->inter_matrix;
 887         else
 888             quant_matrix = s->chroma_inter_matrix;
 889
 890         /* special case for the first coef. no need to add a second vlc table */
 891         UPDATE_CACHE(re, &s->gb);
 892         if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
 893             level= (3*qscale*quant_matrix[0])>>5;
 894             if(GET_CACHE(re, &s->gb)&0x40000000)
 895                 level= -level;
 896             block[0] = level;
 897             mismatch ^= level;
 898             i++;
 899             SKIP_BITS(re, &s->gb, 2);
 900             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
 901                 goto end;
 902         }
 903
 904         /* now quantify & encode AC coefs */
 905         for(;;) {
 906             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
 907
 908             if(level != 0) {
 909                 i += run;
 910                 j = scantable[i];
 911                 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
 912                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
 913                 SKIP_BITS(re, &s->gb, 1);
 914             } else {
 915                 /* escape */
 916                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
 917                 UPDATE_CACHE(re, &s->gb);
 918                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
 919
 920                 i += run;
 921                 j = scantable[i];
 922                 if(level<0){
 923                     level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
 924                     level= -level;
 925                 }else{
 926                     level= ((level*2+1)*qscale*quant_matrix[j])>>5;
 927                 }
 928             }
 929             if (i > 63){
 930                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
 931                 return -1;
 932             }
 933
 934             mismatch ^= level;
 935             block[j] = level;
 936             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
 937                 break;
 938             UPDATE_CACHE(re, &s->gb);
 939         }
 940 end:
 941         LAST_SKIP_BITS(re, &s->gb, 2);
 942         CLOSE_READER(re, &s->gb);
 943     }
 944     block[63] ^= (mismatch & 1);
 945
 946     s->block_last_index[n] = i;
 947     return 0;
 948 }
 949
 950 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
 951                                DCTELEM *block,
 952                                int n)
 953 {
 954     int level, i, j, run;
 955     RLTable *rl = &ff_rl_mpeg1;
 956     uint8_t * const scantable= s->intra_scantable.permutated;
 957     const int qscale= s->qscale;
 958     OPEN_READER(re, &s->gb);
 959     i = -1;
 960
 961     /* special case for the first coef. no need to add a second vlc table */
 962     UPDATE_CACHE(re, &s->gb);
 963     if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
 964         level= (3*qscale)>>1;
 965         if(GET_CACHE(re, &s->gb)&0x40000000)
 966             level= -level;
 967         block[0] = level;
 968         i++;
 969         SKIP_BITS(re, &s->gb, 2);
 970         if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
 971             goto end;
 972     }
 973
 974     /* now quantify & encode AC coefs */
 975     for(;;) {
 976         GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
 977
 978         if(level != 0) {
 979             i += run;
 980             j = scantable[i];
 981             level= ((level*2+1)*qscale)>>1;
 982             level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
 983             SKIP_BITS(re, &s->gb, 1);
 984         } else {
 985             /* escape */
 986             run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
 987             UPDATE_CACHE(re, &s->gb);
 988             level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
 989
 990             i += run;
 991             j = scantable[i];
 992             if(level<0){
 993                 level= ((-level*2+1)*qscale)>>1;
 994                 level= -level;
 995             }else{
 996                 level= ((level*2+1)*qscale)>>1;
 997             }
 998         }
 999
1000         block[j] = level;
1001         if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1002             break;
1003         UPDATE_CACHE(re, &s->gb);
1004     }
1005 end:
1006     LAST_SKIP_BITS(re, &s->gb, 2);
1007     CLOSE_READER(re, &s->gb);
1008     s->block_last_index[n] = i;
1009     return 0;
1010 }
1011
1012
1013 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
1014                                DCTELEM *block,
1015                                int n)
1016 {
1017     int level, dc, diff, i, j, run;
1018     int component;
1019     RLTable *rl;
1020     uint8_t * const scantable= s->intra_scantable.permutated;
1021     const uint16_t *quant_matrix;
1022     const int qscale= s->qscale;
1023     int mismatch;
1024
1025     /* DC coef */
1026     if (n < 4){
1027         quant_matrix = s->intra_matrix;
1028         component = 0;
1029     }else{
1030         quant_matrix = s->chroma_intra_matrix;
1031         component = (n&1) + 1;
1032     }
1033     diff = decode_dc(&s->gb, component);
1034     if (diff >= 0xffff)
1035         return -1;
1036     dc = s->last_dc[component];
1037     dc += diff;
1038     s->last_dc[component] = dc;
1039     block[0] = dc << (3 - s->intra_dc_precision);
1040     dprintf(s->avctx, "dc=%d\n", block[0]);
1041     mismatch = block[0] ^ 1;
1042     i = 0;
1043     if (s->intra_vlc_format)
1044         rl = &ff_rl_mpeg2;
1045     else
1046         rl = &ff_rl_mpeg1;
1047
1048     {
1049         OPEN_READER(re, &s->gb);
1050         /* now quantify & encode AC coefs */
1051         for(;;) {
1052             UPDATE_CACHE(re, &s->gb);
1053             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1054
1055             if(level == 127){
1056                 break;
1057             } else if(level != 0) {
1058                 i += run;
1059                 j = scantable[i];
1060                 level= (level*qscale*quant_matrix[j])>>4;
1061                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1062                 LAST_SKIP_BITS(re, &s->gb, 1);
1063             } else {
1064                 /* escape */
1065                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1066                 UPDATE_CACHE(re, &s->gb);
1067                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1068                 i += run;
1069                 j = scantable[i];
1070                 if(level<0){
1071                     level= (-level*qscale*quant_matrix[j])>>4;
1072                     level= -level;
1073                 }else{
1074                     level= (level*qscale*quant_matrix[j])>>4;
1075                 }
1076             }
1077             if (i > 63){
1078                 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1079                 return -1;
1080             }
1081
1082             mismatch^= level;
1083             block[j] = level;
1084         }
1085         CLOSE_READER(re, &s->gb);
1086     }
1087     block[63]^= mismatch&1;
1088
1089     s->block_last_index[n] = i;
1090     return 0;
1091 }
1092
1093 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
1094                                DCTELEM *block,
1095                                int n)
1096 {
1097     int level, dc, diff, j, run;
1098     int component;
1099     RLTable *rl;
1100     uint8_t * scantable= s->intra_scantable.permutated;
1101     const uint16_t *quant_matrix;
1102     const int qscale= s->qscale;
1103
1104     /* DC coef */
1105     if (n < 4){
1106         quant_matrix = s->intra_matrix;
1107         component = 0;
1108     }else{
1109         quant_matrix = s->chroma_intra_matrix;
1110         component = (n&1) + 1;
1111     }
1112     diff = decode_dc(&s->gb, component);
1113     if (diff >= 0xffff)
1114         return -1;
1115     dc = s->last_dc[component];
1116     dc += diff;
1117     s->last_dc[component] = dc;
1118     block[0] = dc << (3 - s->intra_dc_precision);
1119     if (s->intra_vlc_format)
1120         rl = &ff_rl_mpeg2;
1121     else
1122         rl = &ff_rl_mpeg1;
1123
1124     {
1125         OPEN_READER(re, &s->gb);
1126         /* now quantify & encode AC coefs */
1127         for(;;) {
1128             UPDATE_CACHE(re, &s->gb);
1129             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1130
1131             if(level == 127){
1132                 break;
1133             } else if(level != 0) {
1134                 scantable += run;
1135                 j = *scantable;
1136                 level= (level*qscale*quant_matrix[j])>>4;
1137                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1138                 LAST_SKIP_BITS(re, &s->gb, 1);
1139             } else {
1140                 /* escape */
1141                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1142                 UPDATE_CACHE(re, &s->gb);
1143                 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1144                 scantable += run;
1145                 j = *scantable;
1146                 if(level<0){
1147                     level= (-level*qscale*quant_matrix[j])>>4;
1148                     level= -level;
1149                 }else{
1150                     level= (level*qscale*quant_matrix[j])>>4;
1151                 }
1152             }
1153
1154             block[j] = level;
1155         }
1156         CLOSE_READER(re, &s->gb);
1157     }
1158
1159     s->block_last_index[n] = scantable - s->intra_scantable.permutated;
1160     return 0;
1161 }
1162
1163 typedef struct Mpeg1Context {
1164     MpegEncContext mpeg_enc_ctx;
1165     int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
1166     int repeat_field; /* true if we must repeat the field */
1167     AVPanScan pan_scan; /** some temporary storage for the panscan */
1168     int slice_count;
1169     int swap_uv;//indicate VCR2
1170     int save_aspect_info;
1171     int save_width, save_height;
1172     AVRational frame_rate_ext;       ///< MPEG-2 specific framerate modificator
1173
1174 } Mpeg1Context;
1175
1176 static int mpeg_decode_init(AVCodecContext *avctx)
1177 {
1178     Mpeg1Context *s = avctx->priv_data;
1179     MpegEncContext *s2 = &s->mpeg_enc_ctx;
1180     int i;
1181
1182     //we need some parmutation to store
1183     //matrixes, until MPV_common_init()
1184     //set the real permutatuon
1185     for(i=0;i<64;i++)
1186        s2->dsp.idct_permutation[i]=i;
1187
1188     MPV_decode_defaults(s2);
1189
1190     s->mpeg_enc_ctx.avctx= avctx;
1191     s->mpeg_enc_ctx.flags= avctx->flags;
1192     s->mpeg_enc_ctx.flags2= avctx->flags2;
1193     ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1194     init_vlcs();
1195
1196     s->mpeg_enc_ctx_allocated = 0;
1197     s->mpeg_enc_ctx.picture_number = 0;
1198     s->repeat_field = 0;
1199     s->mpeg_enc_ctx.codec_id= avctx->codec->id;
1200     return 0;
1201 }
1202
1203 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1204                                      const uint8_t *new_perm){
1205     uint16_t temp_matrix[64];
1206     int i;
1207
1208     memcpy(temp_matrix,matrix,64*sizeof(uint16_t));
1209
1210     for(i=0;i<64;i++){
1211         matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1212     }
1213 }
1214
1215 //Call this function when we know all parameters
1216 //it may be called in different places for mpeg1 and mpeg2
1217 static int mpeg_decode_postinit(AVCodecContext *avctx){
1218     Mpeg1Context *s1 = avctx->priv_data;
1219     MpegEncContext *s = &s1->mpeg_enc_ctx;
1220     uint8_t old_permutation[64];
1221
1222     if (
1223         (s1->mpeg_enc_ctx_allocated == 0)||
1224         avctx->coded_width  != s->width ||
1225         avctx->coded_height != s->height||
1226         s1->save_width != s->width ||
1227         s1->save_height != s->height ||
1228         s1->save_aspect_info != s->aspect_ratio_info||
1229         0)
1230     {
1231
1232         if (s1->mpeg_enc_ctx_allocated) {
1233             ParseContext pc= s->parse_context;
1234             s->parse_context.buffer=0;
1235             MPV_common_end(s);
1236             s->parse_context= pc;
1237         }
1238
1239         if( (s->width == 0 )||(s->height == 0))
1240             return -2;
1241
1242         avcodec_set_dimensions(avctx, s->width, s->height);
1243         avctx->bit_rate = s->bit_rate;
1244         s1->save_aspect_info = s->aspect_ratio_info;
1245         s1->save_width = s->width;
1246         s1->save_height = s->height;
1247
1248      //low_delay may be forced, in this case we will have B frames
1249      //that behave like P frames
1250         avctx->has_b_frames = !(s->low_delay);
1251
1252         if(avctx->sub_id==1){//s->codec_id==avctx->codec_id==CODEC_ID
1253             //mpeg1 fps
1254             avctx->time_base.den= ff_frame_rate_tab[s->frame_rate_index].num;
1255             avctx->time_base.num= ff_frame_rate_tab[s->frame_rate_index].den;
1256             //mpeg1 aspect
1257             avctx->sample_aspect_ratio= av_d2q(
1258                     1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1259
1260         }else{//mpeg2
1261         //mpeg2 fps
1262             av_reduce(
1263                 &s->avctx->time_base.den,
1264                 &s->avctx->time_base.num,
1265                 ff_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
1266                 ff_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1267                 1<<30);
1268         //mpeg2 aspect
1269             if(s->aspect_ratio_info > 1){
1270                 if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) ){
1271                     s->avctx->sample_aspect_ratio=
1272                         av_div_q(
1273                          ff_mpeg2_aspect[s->aspect_ratio_info],
1274                          (AVRational){s->width, s->height}
1275                          );
1276                 }else{
1277                     s->avctx->sample_aspect_ratio=
1278                         av_div_q(
1279                          ff_mpeg2_aspect[s->aspect_ratio_info],
1280                          (AVRational){s1->pan_scan.width, s1->pan_scan.height}
1281                         );
1282                 }
1283             }else{
1284                 s->avctx->sample_aspect_ratio=
1285                     ff_mpeg2_aspect[s->aspect_ratio_info];
1286             }
1287         }//mpeg2
1288
1289         if(avctx->xvmc_acceleration){
1290             avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
1291         }else{
1292             if(s->chroma_format <  2){
1293                 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
1294             }else
1295             if(s->chroma_format == 2){
1296                 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_422);
1297             }else
1298             if(s->chroma_format >  2){
1299                 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_444);
1300             }
1301         }
1302         //until then pix_fmt may be changed right after codec init
1303         if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
1304             if( avctx->idct_algo == FF_IDCT_AUTO )
1305                 avctx->idct_algo = FF_IDCT_SIMPLE;
1306
1307         //quantization matrixes may need reordering
1308         //if dct permutation is changed
1309         memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
1310
1311         if (MPV_common_init(s) < 0)
1312             return -2;
1313
1314         quant_matrix_rebuild(s->intra_matrix,       old_permutation,s->dsp.idct_permutation);
1315         quant_matrix_rebuild(s->inter_matrix,       old_permutation,s->dsp.idct_permutation);
1316         quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
1317         quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
1318
1319         s1->mpeg_enc_ctx_allocated = 1;
1320     }
1321     return 0;
1322 }
1323
1324 static int mpeg1_decode_picture(AVCodecContext *avctx,
1325                                 const uint8_t *buf, int buf_size)
1326 {
1327     Mpeg1Context *s1 = avctx->priv_data;
1328     MpegEncContext *s = &s1->mpeg_enc_ctx;
1329     int ref, f_code, vbv_delay;
1330
1331     if(mpeg_decode_postinit(s->avctx) < 0)
1332        return -2;
1333
1334     init_get_bits(&s->gb, buf, buf_size*8);
1335
1336     ref = get_bits(&s->gb, 10); /* temporal ref */
1337     s->pict_type = get_bits(&s->gb, 3);
1338     if(s->pict_type == 0 || s->pict_type > 3)
1339         return -1;
1340
1341     vbv_delay= get_bits(&s->gb, 16);
1342     if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
1343         s->full_pel[0] = get_bits1(&s->gb);
1344         f_code = get_bits(&s->gb, 3);
1345         if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
1346             return -1;
1347         s->mpeg_f_code[0][0] = f_code;
1348         s->mpeg_f_code[0][1] = f_code;
1349     }
1350     if (s->pict_type == B_TYPE) {
1351         s->full_pel[1] = get_bits1(&s->gb);
1352         f_code = get_bits(&s->gb, 3);
1353         if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT)
1354             return -1;
1355         s->mpeg_f_code[1][0] = f_code;
1356         s->mpeg_f_code[1][1] = f_code;
1357     }
1358     s->current_picture.pict_type= s->pict_type;
1359     s->current_picture.key_frame= s->pict_type == I_TYPE;
1360
1361     if(avctx->debug & FF_DEBUG_PICT_INFO)
1362         av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1363
1364     s->y_dc_scale = 8;
1365     s->c_dc_scale = 8;
1366     s->first_slice = 1;
1367     return 0;
1368 }
1369
1370 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1371 {
1372     MpegEncContext *s= &s1->mpeg_enc_ctx;
1373     int horiz_size_ext, vert_size_ext;
1374     int bit_rate_ext;
1375
1376     skip_bits(&s->gb, 1); /* profil and level esc*/
1377     s->avctx->profile= get_bits(&s->gb, 3);
1378     s->avctx->level= get_bits(&s->gb, 4);
1379     s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1380     s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1381     horiz_size_ext = get_bits(&s->gb, 2);
1382     vert_size_ext = get_bits(&s->gb, 2);
1383     s->width |= (horiz_size_ext << 12);
1384     s->height |= (vert_size_ext << 12);
1385     bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1386     s->bit_rate += (bit_rate_ext << 18) * 400;
1387     skip_bits1(&s->gb); /* marker */
1388     s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
1389
1390     s->low_delay = get_bits1(&s->gb);
1391     if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
1392
1393     s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
1394     s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;
1395
1396     dprintf(s->avctx, "sequence extension\n");
1397     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
1398     s->avctx->sub_id = 2; /* indicates mpeg2 found */
1399
1400     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1401         av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1402                s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
1403
1404 }
1405
1406 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1407 {
1408     MpegEncContext *s= &s1->mpeg_enc_ctx;
1409     int color_description, w, h;
1410
1411     skip_bits(&s->gb, 3); /* video format */
1412     color_description= get_bits1(&s->gb);
1413     if(color_description){
1414         skip_bits(&s->gb, 8); /* color primaries */
1415         skip_bits(&s->gb, 8); /* transfer_characteristics */
1416         skip_bits(&s->gb, 8); /* matrix_coefficients */
1417     }
1418     w= get_bits(&s->gb, 14);
1419     skip_bits(&s->gb, 1); //marker
1420     h= get_bits(&s->gb, 14);
1421     skip_bits(&s->gb, 1); //marker
1422
1423     s1->pan_scan.width= 16*w;
1424     s1->pan_scan.height=16*h;
1425
1426     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1427         av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1428 }
1429
1430 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1431 {
1432     MpegEncContext *s= &s1->mpeg_enc_ctx;
1433     int i,nofco;
1434
1435     nofco = 1;
1436     if(s->progressive_sequence){
1437         if(s->repeat_first_field){
1438             nofco++;
1439             if(s->top_field_first)
1440                 nofco++;
1441         }
1442     }else{
1443         if(s->picture_structure == PICT_FRAME){
1444             nofco++;
1445             if(s->repeat_first_field)
1446                 nofco++;
1447         }
1448     }
1449     for(i=0; i<nofco; i++){
1450         s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
1451         skip_bits(&s->gb, 1); //marker
1452         s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
1453         skip_bits(&s->gb, 1); //marker
1454     }
1455
1456     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1457         av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1458             s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1459             s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1460             s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
1461         );
1462 }
1463
1464 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1465 {
1466     int i, v, j;
1467
1468     dprintf(s->avctx, "matrix extension\n");
1469
1470     if (get_bits1(&s->gb)) {
1471         for(i=0;i<64;i++) {
1472             v = get_bits(&s->gb, 8);
1473             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1474             s->intra_matrix[j] = v;
1475             s->chroma_intra_matrix[j] = v;
1476         }
1477     }
1478     if (get_bits1(&s->gb)) {
1479         for(i=0;i<64;i++) {
1480             v = get_bits(&s->gb, 8);
1481             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1482             s->inter_matrix[j] = v;
1483             s->chroma_inter_matrix[j] = v;
1484         }
1485     }
1486     if (get_bits1(&s->gb)) {
1487         for(i=0;i<64;i++) {
1488             v = get_bits(&s->gb, 8);
1489             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1490             s->chroma_intra_matrix[j] = v;
1491         }
1492     }
1493     if (get_bits1(&s->gb)) {
1494         for(i=0;i<64;i++) {
1495             v = get_bits(&s->gb, 8);
1496             j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1497             s->chroma_inter_matrix[j] = v;
1498         }
1499     }
1500 }
1501
1502 static void mpeg_decode_picture_coding_extension(MpegEncContext *s)
1503 {
1504     s->full_pel[0] = s->full_pel[1] = 0;
1505     s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1506     s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1507     s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1508     s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1509     s->intra_dc_precision = get_bits(&s->gb, 2);
1510     s->picture_structure = get_bits(&s->gb, 2);
1511     s->top_field_first = get_bits1(&s->gb);
1512     s->frame_pred_frame_dct = get_bits1(&s->gb);
1513     s->concealment_motion_vectors = get_bits1(&s->gb);
1514     s->q_scale_type = get_bits1(&s->gb);
1515     s->intra_vlc_format = get_bits1(&s->gb);
1516     s->alternate_scan = get_bits1(&s->gb);
1517     s->repeat_first_field = get_bits1(&s->gb);
1518     s->chroma_420_type = get_bits1(&s->gb);
1519     s->progressive_frame = get_bits1(&s->gb);
1520
1521     if(s->picture_structure == PICT_FRAME){
1522         s->first_field=0;
1523         s->v_edge_pos= 16*s->mb_height;
1524     }else{
1525         s->first_field ^= 1;
1526         s->v_edge_pos=  8*s->mb_height;
1527         memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
1528     }
1529
1530     if(s->alternate_scan){
1531         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_alternate_vertical_scan);
1532         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_alternate_vertical_scan);
1533     }else{
1534         ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable  , ff_zigzag_direct);
1535         ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable  , ff_zigzag_direct);
1536     }
1537
1538     /* composite display not parsed */
1539     dprintf(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1540     dprintf(s->avctx, "picture_structure=%d\n", s->picture_structure);
1541     dprintf(s->avctx, "top field first=%d\n", s->top_field_first);
1542     dprintf(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1543     dprintf(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1544     dprintf(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1545     dprintf(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1546     dprintf(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1547     dprintf(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1548 }
1549
1550 static void mpeg_decode_extension(AVCodecContext *avctx,
1551                                   const uint8_t *buf, int buf_size)
1552 {
1553     Mpeg1Context *s1 = avctx->priv_data;
1554     MpegEncContext *s = &s1->mpeg_enc_ctx;
1555     int ext_type;
1556
1557     init_get_bits(&s->gb, buf, buf_size*8);
1558
1559     ext_type = get_bits(&s->gb, 4);
1560     switch(ext_type) {
1561     case 0x1:
1562         mpeg_decode_sequence_extension(s1);
1563         break;
1564     case 0x2:
1565         mpeg_decode_sequence_display_extension(s1);
1566         break;
1567     case 0x3:
1568         mpeg_decode_quant_matrix_extension(s);
1569         break;
1570     case 0x7:
1571         mpeg_decode_picture_display_extension(s1);
1572         break;
1573     case 0x8:
1574         mpeg_decode_picture_coding_extension(s);
1575         break;
1576     }
1577 }
1578
1579 static void exchange_uv(MpegEncContext *s){
1580     short * tmp = s->pblocks[4];
1581     s->pblocks[4] = s->pblocks[5];
1582     s->pblocks[5] = tmp;
1583 }
1584
1585 static int mpeg_field_start(MpegEncContext *s){
1586     AVCodecContext *avctx= s->avctx;
1587     Mpeg1Context *s1 = (Mpeg1Context*)s;
1588
1589     /* start frame decoding */
1590     if(s->first_field || s->picture_structure==PICT_FRAME){
1591         if(MPV_frame_start(s, avctx) < 0)
1592             return -1;
1593
1594         ff_er_frame_start(s);
1595
1596         /* first check if we must repeat the frame */
1597         s->current_picture_ptr->repeat_pict = 0;
1598         if (s->repeat_first_field) {
1599             if (s->progressive_sequence) {
1600                 if (s->top_field_first)
1601                     s->current_picture_ptr->repeat_pict = 4;
1602                 else
1603                     s->current_picture_ptr->repeat_pict = 2;
1604             } else if (s->progressive_frame) {
1605                 s->current_picture_ptr->repeat_pict = 1;
1606             }
1607         }
1608
1609         *s->current_picture_ptr->pan_scan= s1->pan_scan;
1610     }else{ //second field
1611             int i;
1612
1613             if(!s->current_picture_ptr){
1614                 av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1615                 return -1;
1616             }
1617
1618             for(i=0; i<4; i++){
1619                 s->current_picture.data[i] = s->current_picture_ptr->data[i];
1620                 if(s->picture_structure == PICT_BOTTOM_FIELD){
1621                     s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
1622                 }
1623             }
1624     }
1625 #ifdef HAVE_XVMC
1626 // MPV_frame_start will call this function too,
1627 // but we need to call it on every field
1628     if(s->avctx->xvmc_acceleration)
1629          XVMC_field_start(s,avctx);
1630 #endif
1631
1632     return 0;
1633 }
1634
1635 #define DECODE_SLICE_ERROR -1
1636 #define DECODE_SLICE_OK 0
1637
1638 /**
1639  * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
1640  * @return DECODE_SLICE_ERROR if the slice is damaged<br>
1641  *         DECODE_SLICE_OK if this slice is ok<br>
1642  */
1643 static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
1644                              const uint8_t **buf, int buf_size)
1645 {
1646     MpegEncContext *s = &s1->mpeg_enc_ctx;
1647     AVCodecContext *avctx= s->avctx;
1648     const int field_pic= s->picture_structure != PICT_FRAME;
1649     const int lowres= s->avctx->lowres;
1650
1651     s->resync_mb_x=
1652     s->resync_mb_y= -1;
1653
1654     if (mb_y<<field_pic >= s->mb_height){
1655         av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s->mb_height);
1656         return -1;
1657     }
1658
1659     init_get_bits(&s->gb, *buf, buf_size*8);
1660
1661     ff_mpeg1_clean_buffers(s);
1662     s->interlaced_dct = 0;
1663
1664     s->qscale = get_qscale(s);
1665
1666     if(s->qscale == 0){
1667         av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1668         return -1;
1669     }
1670
1671     /* extra slice info */
1672     while (get_bits1(&s->gb) != 0) {
1673         skip_bits(&s->gb, 8);
1674     }
1675
1676     s->mb_x=0;
1677
1678     for(;;) {
1679         int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1680         if (code < 0){
1681             av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1682             return -1;
1683         }
1684         if (code >= 33) {
1685             if (code == 33) {
1686                 s->mb_x += 33;
1687             }
1688             /* otherwise, stuffing, nothing to do */
1689         } else {
1690             s->mb_x += code;
1691             break;
1692         }
1693     }
1694     if(s->mb_x >= (unsigned)s->mb_width){
1695         av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1696         return -1;
1697     }
1698
1699     s->resync_mb_x= s->mb_x;
1700     s->resync_mb_y= s->mb_y= mb_y;
1701     s->mb_skip_run= 0;
1702     ff_init_block_index(s);
1703
1704     if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
1705         if(s->avctx->debug&FF_DEBUG_PICT_INFO){
1706              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",
1707                  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],
1708                  s->pict_type == I_TYPE ? "I" : (s->pict_type == P_TYPE ? "P" : (s->pict_type == B_TYPE ? "B" : "S")),
1709                  s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1710                  s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1711                  s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1712         }
1713     }
1714
1715     for(;;) {
1716 #ifdef HAVE_XVMC
1717         //one 1 we memcpy blocks in xvmcvideo
1718         if(s->avctx->xvmc_acceleration > 1)
1719             XVMC_init_block(s);//set s->block
1720 #endif
1721
1722         if(mpeg_decode_mb(s, s->block) < 0)
1723             return -1;
1724
1725         if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
1726             const int wrap = field_pic ? 2*s->b8_stride : s->b8_stride;
1727             int xy = s->mb_x*2 + s->mb_y*2*wrap;
1728             int motion_x, motion_y, dir, i;
1729             if(field_pic && !s->first_field)
1730                 xy += wrap/2;
1731
1732             for(i=0; i<2; i++){
1733                 for(dir=0; dir<2; dir++){
1734                     if (s->mb_intra || (dir==1 && s->pict_type != B_TYPE)) {
1735                         motion_x = motion_y = 0;
1736                     }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
1737                         motion_x = s->mv[dir][0][0];
1738                         motion_y = s->mv[dir][0][1];
1739                     } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
1740                         motion_x = s->mv[dir][i][0];
1741                         motion_y = s->mv[dir][i][1];
1742                     }
1743
1744                     s->current_picture.motion_val[dir][xy    ][0] = motion_x;
1745                     s->current_picture.motion_val[dir][xy    ][1] = motion_y;
1746                     s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1747                     s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1748                     s->current_picture.ref_index [dir][xy    ]=
1749                     s->current_picture.ref_index [dir][xy + 1]= s->field_select[dir][i];
1750                     assert(s->field_select[dir][i]==0 || s->field_select[dir][i]==1);
1751                 }
1752                 xy += wrap;
1753             }
1754         }
1755
1756         s->dest[0] += 16 >> lowres;
1757         s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1758         s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1759
1760         MPV_decode_mb(s, s->block);
1761
1762         if (++s->mb_x >= s->mb_width) {
1763             const int mb_size= 16>>s->avctx->lowres;
1764
1765             ff_draw_horiz_band(s, mb_size*s->mb_y, mb_size);
1766
1767             s->mb_x = 0;
1768             s->mb_y++;
1769
1770             if(s->mb_y<<field_pic >= s->mb_height){
1771                 int left= s->gb.size_in_bits - get_bits_count(&s->gb);
1772                 int is_d10= s->chroma_format==2 && s->pict_type==I_TYPE && avctx->profile==0 && avctx->level==5
1773                             && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
1774                             && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
1775
1776                 if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
1777                    || (avctx->error_resilience >= FF_ER_AGGRESSIVE && left>8)){
1778                     av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
1779                     return -1;
1780                 }else
1781                     goto eos;
1782             }
1783
1784             ff_init_block_index(s);
1785         }
1786
1787         /* skip mb handling */
1788         if (s->mb_skip_run == -1) {
1789             /* read again increment */
1790             s->mb_skip_run = 0;
1791             for(;;) {
1792                 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1793                 if (code < 0){
1794                     av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1795                     return -1;
1796                 }
1797                 if (code >= 33) {
1798                     if (code == 33) {
1799                         s->mb_skip_run += 33;
1800                     }else if(code == 35){
1801                         if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
1802                             av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1803                             return -1;
1804                         }
1805                         goto eos; /* end of slice */
1806                     }
1807                     /* otherwise, stuffing, nothing to do */
1808                 } else {
1809                     s->mb_skip_run += code;
1810                     break;
1811                 }
1812             }
1813             if(s->mb_skip_run){
1814                 int i;
1815                 if(s->pict_type == I_TYPE){
1816                     av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1817                     return -1;
1818                 }
1819
1820                 /* skip mb */
1821                 s->mb_intra = 0;
1822                 for(i=0;i<12;i++)
1823                     s->block_last_index[i] = -1;
1824                 if(s->picture_structure == PICT_FRAME)
1825                     s->mv_type = MV_TYPE_16X16;
1826                 else
1827                     s->mv_type = MV_TYPE_FIELD;
1828                 if (s->pict_type == P_TYPE) {
1829                     /* if P type, zero motion vector is implied */
1830                     s->mv_dir = MV_DIR_FORWARD;
1831                     s->mv[0][0][0] = s->mv[0][0][1] = 0;
1832                     s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1833                     s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1834                     s->field_select[0][0]= s->picture_structure - 1;
1835                 } else {
1836                     /* if B type, reuse previous vectors and directions */
1837                     s->mv[0][0][0] = s->last_mv[0][0][0];
1838                     s->mv[0][0][1] = s->last_mv[0][0][1];
1839                     s->mv[1][0][0] = s->last_mv[1][0][0];
1840                     s->mv[1][0][1] = s->last_mv[1][0][1];
1841                 }
1842             }
1843         }
1844     }
1845 eos: // end of slice
1846     *buf += get_bits_count(&s->gb)/8 - 1;
1847 //printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1848     return 0;
1849 }
1850
1851 static int slice_decode_thread(AVCodecContext *c, void *arg){
1852     MpegEncContext *s= arg;
1853     const uint8_t *buf= s->gb.buffer;
1854     int mb_y= s->start_mb_y;
1855
1856     s->error_count= 3*(s->end_mb_y - s->start_mb_y)*s->mb_width;
1857
1858     for(;;){
1859         uint32_t start_code;
1860         int ret;
1861
1862         ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
1863         emms_c();
1864 //av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1865 //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);
1866         if(ret < 0){
1867             if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
1868                 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);
1869         }else{
1870             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);
1871         }
1872
1873         if(s->mb_y == s->end_mb_y)
1874             return 0;
1875
1876         start_code= -1;
1877         buf = ff_find_start_code(buf, s->gb.buffer_end, &start_code);
1878         mb_y= start_code - SLICE_MIN_START_CODE;
1879         if(mb_y < 0 || mb_y >= s->end_mb_y)
1880             return -1;
1881     }
1882
1883     return 0; //not reached
1884 }
1885
1886 /**
1887  * handles slice ends.
1888  * @return 1 if it seems to be the last slice of
1889  */
1890 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1891 {
1892     Mpeg1Context *s1 = avctx->priv_data;
1893     MpegEncContext *s = &s1->mpeg_enc_ctx;
1894
1895     if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1896         return 0;
1897
1898 #ifdef HAVE_XVMC
1899     if(s->avctx->xvmc_acceleration)
1900         XVMC_field_end(s);
1901 #endif
1902     /* end of slice reached */
1903     if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
1904         /* end of image */
1905
1906         s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
1907
1908         ff_er_frame_end(s);
1909
1910         MPV_frame_end(s);
1911
1912         if (s->pict_type == B_TYPE || s->low_delay) {
1913             *pict= *(AVFrame*)s->current_picture_ptr;
1914             ff_print_debug_info(s, pict);
1915         } else {
1916             s->picture_number++;
1917             /* latency of 1 frame for I and P frames */
1918             /* XXX: use another variable than picture_number */
1919             if (s->last_picture_ptr != NULL) {
1920                 *pict= *(AVFrame*)s->last_picture_ptr;
1921                  ff_print_debug_info(s, pict);
1922             }
1923         }
1924
1925         return 1;
1926     } else {
1927         return 0;
1928     }
1929 }
1930
1931 static int mpeg1_decode_sequence(AVCodecContext *avctx,
1932                                  const uint8_t *buf, int buf_size)
1933 {
1934     Mpeg1Context *s1 = avctx->priv_data;
1935     MpegEncContext *s = &s1->mpeg_enc_ctx;
1936     int width,height;
1937     int i, v, j;
1938
1939     init_get_bits(&s->gb, buf, buf_size*8);
1940
1941     width = get_bits(&s->gb, 12);
1942     height = get_bits(&s->gb, 12);
1943     if (width <= 0 || height <= 0 ||
1944         (width % 2) != 0 || (height % 2) != 0)
1945         return -1;
1946     s->aspect_ratio_info= get_bits(&s->gb, 4);
1947     if (s->aspect_ratio_info == 0)
1948         return -1;
1949     s->frame_rate_index = get_bits(&s->gb, 4);
1950     if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
1951         return -1;
1952     s->bit_rate = get_bits(&s->gb, 18) * 400;
1953     if (get_bits1(&s->gb) == 0) /* marker */
1954         return -1;
1955     s->width = width;
1956     s->height = height;
1957
1958     s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
1959     skip_bits(&s->gb, 1);
1960
1961     /* get matrix */
1962     if (get_bits1(&s->gb)) {
1963         for(i=0;i<64;i++) {
1964             v = get_bits(&s->gb, 8);
1965             if(v==0){
1966                 av_log(s->avctx, AV_LOG_ERROR, "intra matrix damaged\n");
1967                 return -1;
1968             }
1969             j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1970             s->intra_matrix[j] = v;
1971             s->chroma_intra_matrix[j] = v;
1972         }
1973 #ifdef DEBUG
1974         dprintf(s->avctx, "intra matrix present\n");
1975         for(i=0;i<64;i++)
1976             dprintf(s->avctx, " %d", s->intra_matrix[s->dsp.idct_permutation[i]]);
1977         dprintf(s->avctx, "\n");
1978 #endif
1979     } else {
1980         for(i=0;i<64;i++) {
1981             j = s->dsp.idct_permutation[i];
1982             v = ff_mpeg1_default_intra_matrix[i];
1983             s->intra_matrix[j] = v;
1984             s->chroma_intra_matrix[j] = v;
1985         }
1986     }
1987     if (get_bits1(&s->gb)) {
1988         for(i=0;i<64;i++) {
1989             v = get_bits(&s->gb, 8);
1990             if(v==0){
1991                 av_log(s->avctx, AV_LOG_ERROR, "inter matrix damaged\n");
1992                 return -1;
1993             }
1994             j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1995             s->inter_matrix[j] = v;
1996             s->chroma_inter_matrix[j] = v;
1997         }
1998 #ifdef DEBUG
1999         dprintf(s->avctx, "non intra matrix present\n");
2000         for(i=0;i<64;i++)
2001             dprintf(s->avctx, " %d", s->inter_matrix[s->dsp.idct_permutation[i]]);
2002         dprintf(s->avctx, "\n");
2003 #endif
2004     } else {
2005         for(i=0;i<64;i++) {
2006             int j= s->dsp.idct_permutation[i];
2007             v = ff_mpeg1_default_non_intra_matrix[i];
2008             s->inter_matrix[j] = v;
2009             s->chroma_inter_matrix[j] = v;
2010         }
2011     }
2012
2013     if(show_bits(&s->gb, 23) != 0){
2014         av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2015         return -1;
2016     }
2017
2018     /* we set mpeg2 parameters so that it emulates mpeg1 */
2019     s->progressive_sequence = 1;
2020     s->progressive_frame = 1;
2021     s->picture_structure = PICT_FRAME;
2022     s->frame_pred_frame_dct = 1;
2023     s->chroma_format = 1;
2024     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2025     avctx->sub_id = 1; /* indicates mpeg1 */
2026     s->out_format = FMT_MPEG1;
2027     s->swap_uv = 0;//AFAIK VCR2 don't have SEQ_HEADER
2028     if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2029
2030     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2031         av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2032                s->avctx->rc_buffer_size, s->bit_rate);
2033
2034     return 0;
2035 }
2036
2037 static int vcr2_init_sequence(AVCodecContext *avctx)
2038 {
2039     Mpeg1Context *s1 = avctx->priv_data;
2040     MpegEncContext *s = &s1->mpeg_enc_ctx;
2041     int i, v;
2042
2043     /* start new mpeg1 context decoding */
2044     s->out_format = FMT_MPEG1;
2045     if (s1->mpeg_enc_ctx_allocated) {
2046         MPV_common_end(s);
2047     }
2048     s->width  = avctx->coded_width;
2049     s->height = avctx->coded_height;
2050     avctx->has_b_frames= 0; //true?
2051     s->low_delay= 1;
2052
2053     if(avctx->xvmc_acceleration){
2054         avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2055     }else{
2056         avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420);
2057     }
2058
2059     if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2060         if( avctx->idct_algo == FF_IDCT_AUTO )
2061             avctx->idct_algo = FF_IDCT_SIMPLE;
2062
2063     if (MPV_common_init(s) < 0)
2064         return -1;
2065     exchange_uv(s);//common init reset pblocks, so we swap them here
2066     s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB
2067     s1->mpeg_enc_ctx_allocated = 1;
2068
2069     for(i=0;i<64;i++) {
2070         int j= s->dsp.idct_permutation[i];
2071         v = ff_mpeg1_default_intra_matrix[i];
2072         s->intra_matrix[j] = v;
2073         s->chroma_intra_matrix[j] = v;
2074
2075         v = ff_mpeg1_default_non_intra_matrix[i];
2076         s->inter_matrix[j] = v;
2077         s->chroma_inter_matrix[j] = v;
2078     }
2079
2080     s->progressive_sequence = 1;
2081     s->progressive_frame = 1;
2082     s->picture_structure = PICT_FRAME;
2083     s->frame_pred_frame_dct = 1;
2084     s->chroma_format = 1;
2085     s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2086     avctx->sub_id = 2; /* indicates mpeg2 */
2087     return 0;
2088 }
2089
2090
2091 static void mpeg_decode_user_data(AVCodecContext *avctx,
2092                                   const uint8_t *buf, int buf_size)
2093 {
2094     const uint8_t *p;
2095     int len, flags;
2096     p = buf;
2097     len = buf_size;
2098
2099     /* we parse the DTG active format information */
2100     if (len >= 5 &&
2101         p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2102         flags = p[4];
2103         p += 5;
2104         len -= 5;
2105         if (flags & 0x80) {
2106             /* skip event id */
2107             if (len < 2)
2108                 return;
2109             p += 2;
2110             len -= 2;
2111         }
2112         if (flags & 0x40) {
2113             if (len < 1)
2114                 return;
2115             avctx->dtg_active_format = p[0] & 0x0f;
2116         }
2117     }
2118 }
2119
2120 static void mpeg_decode_gop(AVCodecContext *avctx,
2121                             const uint8_t *buf, int buf_size){
2122     Mpeg1Context *s1 = avctx->priv_data;
2123     MpegEncContext *s = &s1->mpeg_enc_ctx;
2124
2125     int drop_frame_flag;
2126     int time_code_hours, time_code_minutes;
2127     int time_code_seconds, time_code_pictures;
2128     int broken_link;
2129
2130     init_get_bits(&s->gb, buf, buf_size*8);
2131
2132     drop_frame_flag = get_bits1(&s->gb);
2133
2134     time_code_hours=get_bits(&s->gb,5);
2135     time_code_minutes = get_bits(&s->gb,6);
2136     skip_bits1(&s->gb);//marker bit
2137     time_code_seconds = get_bits(&s->gb,6);
2138     time_code_pictures = get_bits(&s->gb,6);
2139
2140     /*broken_link indicate that after editing the
2141       reference frames of the first B-Frames after GOP I-Frame
2142       are missing (open gop)*/
2143     broken_link = get_bits1(&s->gb);
2144
2145     if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2146         av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) broken_link=%d\n",
2147             time_code_hours, time_code_minutes, time_code_seconds,
2148             time_code_pictures, broken_link);
2149 }
2150 /**
2151  * finds the end of the current frame in the bitstream.
2152  * @return the position of the first byte of the next frame, or -1
2153  */
2154 int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
2155 {
2156     int i;
2157     uint32_t state= pc->state;
2158
2159     i=0;
2160     if(!pc->frame_start_found){
2161         for(i=0; i<buf_size; i++){
2162             i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
2163             if(state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
2164                 i++;
2165                 pc->frame_start_found=1;
2166                 break;
2167             }
2168         }
2169     }
2170
2171     if(pc->frame_start_found){
2172         /* EOF considered as end of frame */
2173         if (buf_size == 0)
2174             return 0;
2175         for(; i<buf_size; i++){
2176             i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
2177             if((state&0xFFFFFF00) == 0x100){
2178                 if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
2179                     pc->frame_start_found=0;
2180                     pc->state=-1;
2181                     return i-3;
2182                 }
2183             }
2184         }
2185     }
2186     pc->state= state;
2187     return END_NOT_FOUND;
2188 }
2189
2190 /* handle buffering and image synchronisation */
2191 static int mpeg_decode_frame(AVCodecContext *avctx,
2192                              void *data, int *data_size,
2193                              uint8_t *buf, int buf_size)
2194 {
2195     Mpeg1Context *s = avctx->priv_data;
2196     const uint8_t *buf_end;
2197     const uint8_t *buf_ptr;
2198     uint32_t start_code;
2199     int ret, input_size;
2200     AVFrame *picture = data;
2201     MpegEncContext *s2 = &s->mpeg_enc_ctx;
2202     dprintf(avctx, "fill_buffer\n");
2203
2204     if (buf_size == 0) {
2205         /* special case for last picture */
2206         if (s2->low_delay==0 && s2->next_picture_ptr) {
2207             *picture= *(AVFrame*)s2->next_picture_ptr;
2208             s2->next_picture_ptr= NULL;
2209
2210             *data_size = sizeof(AVFrame);
2211         }
2212         return 0;
2213     }
2214
2215     if(s2->flags&CODEC_FLAG_TRUNCATED){
2216         int next= ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size);
2217
2218         if( ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
2219             return buf_size;
2220     }
2221
2222     buf_ptr = buf;
2223     buf_end = buf + buf_size;
2224
2225 #if 0
2226     if (s->repeat_field % 2 == 1) {
2227         s->repeat_field++;
2228         //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2229         //        s2->picture_number, s->repeat_field);
2230         if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
2231             *data_size = sizeof(AVPicture);
2232             goto the_end;
2233         }
2234     }
2235 #endif
2236
2237     if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == ff_get_fourcc("VCR2"))
2238         vcr2_init_sequence(avctx);
2239
2240     s->slice_count= 0;
2241
2242     for(;;) {
2243         /* find start next code */
2244         start_code = -1;
2245         buf_ptr = ff_find_start_code(buf_ptr,buf_end, &start_code);
2246         if (start_code > 0x1ff){
2247             if(s2->pict_type != B_TYPE || avctx->skip_frame <= AVDISCARD_DEFAULT){
2248                 if(avctx->thread_count > 1){
2249                     int i;
2250
2251                     avctx->execute(avctx, slice_decode_thread,  (void**)&(s2->thread_context[0]), NULL, s->slice_count);
2252                     for(i=0; i<s->slice_count; i++)
2253                         s2->error_count += s2->thread_context[i]->error_count;
2254                 }
2255                 if (slice_end(avctx, picture)) {
2256                     if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2257                         *data_size = sizeof(AVPicture);
2258                 }
2259             }
2260             return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2261         }
2262
2263         input_size = buf_end - buf_ptr;
2264
2265         if(avctx->debug & FF_DEBUG_STARTCODE){
2266             av_log(avctx, AV_LOG_DEBUG, "%3X at %zd left %d\n", start_code, buf_ptr-buf, input_size);
2267         }
2268
2269         /* prepare data for next start code */
2270         switch(start_code) {
2271         case SEQ_START_CODE:
2272             mpeg1_decode_sequence(avctx, buf_ptr,
2273                                     input_size);
2274             break;
2275
2276         case PICTURE_START_CODE:
2277             /* we have a complete image : we try to decompress it */
2278             mpeg1_decode_picture(avctx,
2279                                     buf_ptr, input_size);
2280             break;
2281         case EXT_START_CODE:
2282             mpeg_decode_extension(avctx,
2283                                     buf_ptr, input_size);
2284             break;
2285         case USER_START_CODE:
2286             mpeg_decode_user_data(avctx,
2287                                     buf_ptr, input_size);
2288             break;
2289         case GOP_START_CODE:
2290             s2->first_field=0;
2291             mpeg_decode_gop(avctx,
2292                                     buf_ptr, input_size);
2293             break;
2294         default:
2295             if (start_code >= SLICE_MIN_START_CODE &&
2296                 start_code <= SLICE_MAX_START_CODE) {
2297                 int mb_y= start_code - SLICE_MIN_START_CODE;
2298
2299                 if(s2->last_picture_ptr==NULL){
2300                 /* Skip B-frames if we do not have reference frames. */
2301                     if(s2->pict_type==B_TYPE) break;
2302                 /* Skip P-frames if we do not have reference frame no valid header. */
2303 //                    if(s2->pict_type==P_TYPE && s2->first_field && !s2->first_slice) break;
2304                 }
2305                 /* Skip B-frames if we are in a hurry. */
2306                 if(avctx->hurry_up && s2->pict_type==B_TYPE) break;
2307                 if(  (avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type==B_TYPE)
2308                     ||(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type!=I_TYPE)
2309                     || avctx->skip_frame >= AVDISCARD_ALL)
2310                     break;
2311                 /* Skip everything if we are in a hurry>=5. */
2312                 if(avctx->hurry_up>=5) break;
2313
2314                 if (!s->mpeg_enc_ctx_allocated) break;
2315
2316                 if(s2->codec_id == CODEC_ID_MPEG2VIDEO){
2317                     if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
2318                         break;
2319                 }
2320
2321                 if(s2->first_slice){
2322                     s2->first_slice=0;
2323                             if(mpeg_field_start(s2) < 0)
2324                         return -1;
2325                     }
2326                 if(!s2->current_picture_ptr){
2327                     av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
2328                     return -1;
2329                 }
2330
2331                 if(avctx->thread_count > 1){
2332                     int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
2333                     if(threshold <= mb_y){
2334                         MpegEncContext *thread_context= s2->thread_context[s->slice_count];
2335
2336                         thread_context->start_mb_y= mb_y;
2337                         thread_context->end_mb_y  = s2->mb_height;
2338                         if(s->slice_count){
2339                             s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
2340                             ff_update_duplicate_context(thread_context, s2);
2341                         }
2342                         init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2343                         s->slice_count++;
2344                     }
2345                     buf_ptr += 2; //FIXME add minimum num of bytes per slice
2346                 }else{
2347                     ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
2348                     emms_c();
2349
2350                     if(ret < 0){
2351                         if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
2352                             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);
2353                     }else{
2354                         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);
2355                     }
2356                 }
2357             }
2358             break;
2359         }
2360     }
2361 }
2362
2363 static int mpeg_decode_end(AVCodecContext *avctx)
2364 {
2365     Mpeg1Context *s = avctx->priv_data;
2366
2367     if (s->mpeg_enc_ctx_allocated)
2368         MPV_common_end(&s->mpeg_enc_ctx);
2369     return 0;
2370 }
2371
2372 AVCodec mpeg1video_decoder = {
2373     "mpeg1video",
2374     CODEC_TYPE_VIDEO,
2375     CODEC_ID_MPEG1VIDEO,
2376     sizeof(Mpeg1Context),
2377     mpeg_decode_init,
2378     NULL,
2379     mpeg_decode_end,
2380     mpeg_decode_frame,
2381     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2382     .flush= ff_mpeg_flush,
2383 };
2384
2385 AVCodec mpeg2video_decoder = {
2386     "mpeg2video",
2387     CODEC_TYPE_VIDEO,
2388     CODEC_ID_MPEG2VIDEO,
2389     sizeof(Mpeg1Context),
2390     mpeg_decode_init,
2391     NULL,
2392     mpeg_decode_end,
2393     mpeg_decode_frame,
2394     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2395     .flush= ff_mpeg_flush,
2396 };
2397
2398 //legacy decoder
2399 AVCodec mpegvideo_decoder = {
2400     "mpegvideo",
2401     CODEC_TYPE_VIDEO,
2402     CODEC_ID_MPEG2VIDEO,
2403     sizeof(Mpeg1Context),
2404     mpeg_decode_init,
2405     NULL,
2406     mpeg_decode_end,
2407     mpeg_decode_frame,
2408     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2409     .flush= ff_mpeg_flush,
2410 };
2411
2412 #ifdef HAVE_XVMC
2413 static int mpeg_mc_decode_init(AVCodecContext *avctx){
2414     Mpeg1Context *s;
2415
2416     if( avctx->thread_count > 1)
2417         return -1;
2418     if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
2419         return -1;
2420     if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
2421         dprintf(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2422     }
2423     mpeg_decode_init(avctx);
2424     s = avctx->priv_data;
2425
2426     avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
2427     avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
2428
2429     return 0;
2430 }
2431
2432 AVCodec mpeg_xvmc_decoder = {
2433     "mpegvideo_xvmc",
2434     CODEC_TYPE_VIDEO,
2435     CODEC_ID_MPEG2VIDEO_XVMC,
2436     sizeof(Mpeg1Context),
2437     mpeg_mc_decode_init,
2438     NULL,
2439     mpeg_decode_end,
2440     mpeg_decode_frame,
2441     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2442     .flush= ff_mpeg_flush,
2443 };
2444
2445 #endif
2446
2447 /* this is ugly i know, but the alternative is too make
2448    hundreds of vars global and prefix them with ff_mpeg1_
2449    which is far uglier. */
2450 #include "mdec.c"