libavcodec/h263dec.c

   1 /*
   2  * H.263 decoder
   3  * Copyright (c) 2001 Fabrice Bellard.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  */
  19
  20 /**
  21  * @file h263dec.c
  22  * H.263 decoder.
  23  */
  24
  25 #include "avcodec.h"
  26 #include "dsputil.h"
  27 #include "mpegvideo.h"
  28
  29 //#define DEBUG
  30 //#define PRINT_FRAME_TIME
  31
  32 int ff_h263_decode_init(AVCodecContext *avctx)
  33 {
  34     MpegEncContext *s = avctx->priv_data;
  35
  36     s->avctx = avctx;
  37     s->out_format = FMT_H263;
  38
  39     s->width = avctx->width;
  40     s->height = avctx->height;
  41     s->workaround_bugs= avctx->workaround_bugs;
  42
  43     // set defaults
  44     s->quant_precision=5;
  45     s->progressive_sequence=1;
  46     s->decode_mb= ff_h263_decode_mb;
  47     s->low_delay= 1;
  48     avctx->pix_fmt= PIX_FMT_YUV420P;
  49     s->unrestricted_mv= 1;
  50
  51     /* select sub codec */
  52     switch(avctx->codec->id) {
  53     case CODEC_ID_H263:
  54         s->gob_number = 0;
  55         s->unrestricted_mv= 0;
  56         break;
  57     case CODEC_ID_MPEG4:
  58         s->decode_mb= ff_mpeg4_decode_mb;
  59         s->time_increment_bits = 4; /* default value for broken headers */
  60         s->h263_pred = 1;
  61         s->low_delay = 0; //default, might be overriden in the vol header during header parsing
  62         break;
  63     case CODEC_ID_MSMPEG4V1:
  64         s->h263_msmpeg4 = 1;
  65         s->h263_pred = 1;
  66         s->msmpeg4_version=1;
  67         break;
  68     case CODEC_ID_MSMPEG4V2:
  69         s->h263_msmpeg4 = 1;
  70         s->h263_pred = 1;
  71         s->msmpeg4_version=2;
  72         break;
  73     case CODEC_ID_MSMPEG4V3:
  74         s->h263_msmpeg4 = 1;
  75         s->h263_pred = 1;
  76         s->msmpeg4_version=3;
  77         break;
  78     case CODEC_ID_WMV1:
  79         s->h263_msmpeg4 = 1;
  80         s->h263_pred = 1;
  81         s->msmpeg4_version=4;
  82         break;
  83     case CODEC_ID_WMV2:
  84         s->h263_msmpeg4 = 1;
  85         s->h263_pred = 1;
  86         s->msmpeg4_version=5;
  87         break;
  88     case CODEC_ID_H263I:
  89         s->h263_intel = 1;
  90         break;
  91     case CODEC_ID_FLV1:
  92         s->h263_flv = 1;
  93         break;
  94     default:
  95         return -1;
  96     }
  97     s->codec_id= avctx->codec->id;
  98
  99     /* for h263, we allocate the images after having read the header */
 100     if (avctx->codec->id != CODEC_ID_H263 && avctx->codec->id != CODEC_ID_MPEG4)
 101         if (MPV_common_init(s) < 0)
 102             return -1;
 103
 104     if (s->h263_msmpeg4)
 105         ff_msmpeg4_decode_init(s);
 106     else
 107         h263_decode_init_vlc(s);
 108
 109     return 0;
 110 }
 111
 112 int ff_h263_decode_end(AVCodecContext *avctx)
 113 {
 114     MpegEncContext *s = avctx->priv_data;
 115
 116     MPV_common_end(s);
 117     return 0;
 118 }
 119
 120 /**
 121  * retunrs the number of bytes consumed for building the current frame
 122  */
 123 static int get_consumed_bytes(MpegEncContext *s, int buf_size){
 124     int pos= (get_bits_count(&s->gb)+7)>>3;
 125
 126     if(s->divx_packed){
 127         //we would have to scan through the whole buf to handle the weird reordering ...
 128         return buf_size;
 129     }else if(s->flags&CODEC_FLAG_TRUNCATED){
 130         pos -= s->parse_context.last_index;
 131         if(pos<0) pos=0; // padding is not really read so this might be -1
 132         return pos;
 133     }else{
 134         if(pos==0) pos=1; //avoid infinite loops (i doubt thats needed but ...)
 135         if(pos+10>buf_size) pos=buf_size; // oops ;)
 136
 137         return pos;
 138     }
 139 }
 140
 141 static int decode_slice(MpegEncContext *s){
 142     const int part_mask= s->partitioned_frame ? (AC_END|AC_ERROR) : 0x7F;
 143     s->last_resync_gb= s->gb;
 144     s->first_slice_line= 1;
 145
 146     s->resync_mb_x= s->mb_x;
 147     s->resync_mb_y= s->mb_y;
 148
 149     s->y_dc_scale= s->y_dc_scale_table[ s->qscale ];
 150     s->c_dc_scale= s->c_dc_scale_table[ s->chroma_qscale ];
 151
 152     if(s->partitioned_frame){
 153         const int qscale= s->qscale;
 154
 155         if(s->codec_id==CODEC_ID_MPEG4){
 156             if(ff_mpeg4_decode_partitions(s) < 0)
 157                 return -1;
 158         }
 159
 160         /* restore variables which were modified */
 161         s->first_slice_line=1;
 162         s->mb_x= s->resync_mb_x;
 163         s->mb_y= s->resync_mb_y;
 164         s->chroma_qscale= s->qscale= qscale;
 165         s->y_dc_scale= s->y_dc_scale_table[ s->qscale ];
 166         s->c_dc_scale= s->c_dc_scale_table[ s->qscale ];
 167     }
 168
 169     for(; s->mb_y < s->mb_height; s->mb_y++) {
 170         /* per-row end of slice checks */
 171         if(s->msmpeg4_version){
 172             if(s->resync_mb_y + s->slice_height == s->mb_y){
 173                 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);
 174
 175                 return 0;
 176             }
 177         }
 178
 179         if(s->msmpeg4_version==1){
 180             s->last_dc[0]=
 181             s->last_dc[1]=
 182             s->last_dc[2]= 128;
 183         }
 184
 185         ff_init_block_index(s);
 186         for(; s->mb_x < s->mb_width; s->mb_x++) {
 187             int ret;
 188
 189             ff_update_block_index(s);
 190
 191             if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
 192                 s->first_slice_line=0;
 193             }
 194
 195             /* DCT & quantize */
 196             s->dsp.clear_blocks(s->block[0]);
 197
 198             s->mv_dir = MV_DIR_FORWARD;
 199             s->mv_type = MV_TYPE_16X16;
 200 //            s->mb_skiped = 0;
 201 //printf("%d %d %06X\n", ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
 202             ret= s->decode_mb(s, s->block);
 203
 204             if (s->pict_type!=B_TYPE)
 205                 ff_h263_update_motion_val(s);
 206
 207             if(ret<0){
 208                 const int xy= s->mb_x + s->mb_y*s->mb_stride;
 209                 if(ret==SLICE_END){
 210                     MPV_decode_mb(s, s->block);
 211                     if(s->loop_filter)
 212                         ff_h263_loop_filter(s);
 213
 214 //printf("%d %d %d %06X\n", s->mb_x, s->mb_y, s->gb.size*8 - get_bits_count(&s->gb), show_bits(&s->gb, 24));
 215                     ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, (AC_END|DC_END|MV_END)&part_mask);
 216
 217                     s->padding_bug_score--;
 218
 219                     if(++s->mb_x >= s->mb_width){
 220                         s->mb_x=0;
 221                         ff_draw_horiz_band(s, s->mb_y*16, 16);
 222                         s->mb_y++;
 223                     }
 224                     return 0;
 225                 }else if(ret==SLICE_NOEND){
 226                     av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy);
 227                     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)&part_mask);
 228                     return -1;
 229                 }
 230                 av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
 231                 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)&part_mask);
 232
 233                 return -1;
 234             }
 235
 236             MPV_decode_mb(s, s->block);
 237             if(s->loop_filter)
 238                 ff_h263_loop_filter(s);
 239         }
 240
 241         ff_draw_horiz_band(s, s->mb_y*16, 16);
 242
 243         s->mb_x= 0;
 244     }
 245
 246     assert(s->mb_x==0 && s->mb_y==s->mb_height);
 247
 248     /* try to detect the padding bug */
 249     if(      s->codec_id==CODEC_ID_MPEG4
 250        &&   (s->workaround_bugs&FF_BUG_AUTODETECT)
 251        &&    s->gb.size_in_bits - get_bits_count(&s->gb) >=0
 252        &&    s->gb.size_in_bits - get_bits_count(&s->gb) < 48
 253 //       &&   !s->resync_marker
 254        &&   !s->data_partitioning){
 255
 256         const int bits_count= get_bits_count(&s->gb);
 257         const int bits_left = s->gb.size_in_bits - bits_count;
 258
 259         if(bits_left==0){
 260             s->padding_bug_score+=16;
 261         }else if(bits_left>8){
 262             s->padding_bug_score++;
 263         } else if(bits_left != 1){
 264             int v= show_bits(&s->gb, 8);
 265             v|= 0x7F >> (7-(bits_count&7));
 266
 267             if(v==0x7F)
 268                 s->padding_bug_score--;
 269             else
 270                 s->padding_bug_score++;
 271         }
 272     }
 273
 274     // handle formats which dont have unique end markers
 275     if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
 276         int left= s->gb.size_in_bits - get_bits_count(&s->gb);
 277         int max_extra=7;
 278
 279         /* no markers in M$ crap */
 280         if(s->msmpeg4_version && s->pict_type==I_TYPE)
 281             max_extra+= 17;
 282
 283         /* buggy padding but the frame should still end approximately at the bitstream end */
 284         if((s->workaround_bugs&FF_BUG_NO_PADDING) && s->error_resilience>=3)
 285             max_extra+= 48;
 286         else if((s->workaround_bugs&FF_BUG_NO_PADDING))
 287             max_extra+= 256*256*256*64;
 288
 289         if(left>max_extra){
 290             av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
 291         }
 292         else if(left<0){
 293             av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
 294         }else
 295             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);
 296
 297         return 0;
 298     }
 299
 300     av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
 301             s->gb.size_in_bits - get_bits_count(&s->gb),
 302             show_bits(&s->gb, 24), s->padding_bug_score);
 303
 304     ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, (AC_END|DC_END|MV_END)&part_mask);
 305
 306     return -1;
 307 }
 308
 309 /**
 310  * finds the end of the current frame in the bitstream.
 311  * @return the position of the first byte of the next frame, or -1
 312  */
 313 static int mpeg4_find_frame_end(MpegEncContext *s, uint8_t *buf, int buf_size){
 314     ParseContext *pc= &s->parse_context;
 315     int vop_found, i;
 316     uint32_t state;
 317
 318     vop_found= pc->frame_start_found;
 319     state= pc->state;
 320
 321     i=0;
 322     if(!vop_found){
 323         for(i=0; i<buf_size; i++){
 324             state= (state<<8) | buf[i];
 325             if(state == 0x1B6){
 326                 i++;
 327                 vop_found=1;
 328                 break;
 329             }
 330         }
 331     }
 332
 333     if(vop_found){
 334       for(; i<buf_size; i++){
 335         state= (state<<8) | buf[i];
 336         if((state&0xFFFFFF00) == 0x100){
 337             pc->frame_start_found=0;
 338             pc->state=-1;
 339             return i-3;
 340         }
 341       }
 342     }
 343     pc->frame_start_found= vop_found;
 344     pc->state= state;
 345     return END_NOT_FOUND;
 346 }
 347
 348 static int h263_find_frame_end(MpegEncContext *s, uint8_t *buf, int buf_size){
 349     ParseContext *pc= &s->parse_context;
 350     int vop_found, i;
 351     uint32_t state;
 352
 353     vop_found= pc->frame_start_found;
 354     state= pc->state;
 355
 356     i=0;
 357     if(!vop_found){
 358         for(i=0; i<buf_size; i++){
 359             state= (state<<8) | buf[i];
 360             if(state>>(32-22) == 0x20){
 361                 i++;
 362                 vop_found=1;
 363                 break;
 364             }
 365         }
 366     }
 367
 368     if(vop_found){
 369       for(; i<buf_size; i++){
 370         state= (state<<8) | buf[i];
 371         if(state>>(32-22) == 0x20){
 372             pc->frame_start_found=0;
 373             pc->state=-1;
 374             return i-3;
 375         }
 376       }
 377     }
 378     pc->frame_start_found= vop_found;
 379     pc->state= state;
 380
 381     return END_NOT_FOUND;
 382 }
 383
 384 int ff_h263_decode_frame(AVCodecContext *avctx,
 385                              void *data, int *data_size,
 386                              uint8_t *buf, int buf_size)
 387 {
 388     MpegEncContext *s = avctx->priv_data;
 389     int ret;
 390     AVFrame *pict = data;
 391
 392 #ifdef PRINT_FRAME_TIME
 393 uint64_t time= rdtsc();
 394 #endif
 395 #ifdef DEBUG
 396     printf("*****frame %d size=%d\n", avctx->frame_number, buf_size);
 397     printf("bytes=%x %x %x %x\n", buf[0], buf[1], buf[2], buf[3]);
 398 #endif
 399     s->flags= avctx->flags;
 400
 401     *data_size = 0;
 402
 403     /* no supplementary picture */
 404     if (buf_size == 0) {
 405         /* special case for last picture */
 406         if (s->low_delay==0 && s->next_picture_ptr) {
 407             *pict= *(AVFrame*)s->next_picture_ptr;
 408             s->next_picture_ptr= NULL;
 409
 410             *data_size = sizeof(AVFrame);
 411         }
 412
 413         return 0;
 414     }
 415
 416     if(s->flags&CODEC_FLAG_TRUNCATED){
 417         int next;
 418
 419         if(s->codec_id==CODEC_ID_MPEG4){
 420             next= mpeg4_find_frame_end(s, buf, buf_size);
 421         }else if(s->codec_id==CODEC_ID_H263){
 422             next= h263_find_frame_end(s, buf, buf_size);
 423         }else{
 424             av_log(s->avctx, AV_LOG_ERROR, "this codec doesnt support truncated bitstreams\n");
 425             return -1;
 426         }
 427
 428         if( ff_combine_frame(s, next, &buf, &buf_size) < 0 )
 429             return buf_size;
 430     }
 431
 432 retry:
 433
 434     if(s->bitstream_buffer_size && buf_size<20){ //divx 5.01+ frame reorder
 435         init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
 436     }else
 437         init_get_bits(&s->gb, buf, buf_size*8);
 438     s->bitstream_buffer_size=0;
 439
 440     if (!s->context_initialized) {
 441         if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
 442             return -1;
 443     }
 444
 445     //we need to set current_picture_ptr before reading the header, otherwise we cant store anyting im there
 446     if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){
 447         int i= ff_find_unused_picture(s, 0);
 448         s->current_picture_ptr= &s->picture[i];
 449     }
 450
 451     /* let's go :-) */
 452     if (s->msmpeg4_version==5) {
 453         ret= ff_wmv2_decode_picture_header(s);
 454     } else if (s->msmpeg4_version) {
 455         ret = msmpeg4_decode_picture_header(s);
 456     } else if (s->h263_pred) {
 457         if(s->avctx->extradata_size && s->picture_number==0){
 458             GetBitContext gb;
 459
 460             init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
 461             ret = ff_mpeg4_decode_picture_header(s, &gb);
 462         }
 463         ret = ff_mpeg4_decode_picture_header(s, &s->gb);
 464
 465         if(s->flags& CODEC_FLAG_LOW_DELAY)
 466             s->low_delay=1;
 467     } else if (s->h263_intel) {
 468         ret = intel_h263_decode_picture_header(s);
 469     } else if (s->h263_flv) {
 470         ret = flv_h263_decode_picture_header(s);
 471     } else {
 472         ret = h263_decode_picture_header(s);
 473     }
 474
 475     if(ret==FRAME_SKIPED) return get_consumed_bytes(s, buf_size);
 476
 477     /* skip if the header was thrashed */
 478     if (ret < 0){
 479         av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
 480         return -1;
 481     }
 482
 483     avctx->has_b_frames= !s->low_delay;
 484
 485     if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
 486         if(s->avctx->stream_codec_tag == ff_get_fourcc("XVID") ||
 487            s->avctx->codec_tag == ff_get_fourcc("XVID") || s->avctx->codec_tag == ff_get_fourcc("XVIX"))
 488             s->xvid_build= -1;
 489 #if 0
 490         if(s->avctx->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
 491            && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
 492             s->xvid_build= -1;
 493 #endif
 494     }
 495
 496     if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
 497         if(s->avctx->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
 498             s->divx_version= 400; //divx 4
 499     }
 500
 501     if(s->workaround_bugs&FF_BUG_AUTODETECT){
 502         s->workaround_bugs &= ~FF_BUG_NO_PADDING;
 503
 504         if(s->padding_bug_score > -2 && !s->data_partitioning && (s->divx_version || !s->resync_marker))
 505             s->workaround_bugs |=  FF_BUG_NO_PADDING;
 506
 507         if(s->avctx->codec_tag == ff_get_fourcc("XVIX"))
 508             s->workaround_bugs|= FF_BUG_XVID_ILACE;
 509
 510         if(s->avctx->codec_tag == ff_get_fourcc("UMP4")){
 511             s->workaround_bugs|= FF_BUG_UMP4;
 512         }
 513
 514         if(s->divx_version>=500){
 515             s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
 516         }
 517
 518         if(s->divx_version>502){
 519             s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
 520         }
 521
 522         if(s->xvid_build && s->xvid_build<=3)
 523             s->padding_bug_score= 256*256*256*64;
 524
 525         if(s->xvid_build && s->xvid_build<=1)
 526             s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
 527
 528         if(s->xvid_build && s->xvid_build<=12)
 529             s->workaround_bugs|= FF_BUG_EDGE;
 530
 531 #define SET_QPEL_FUNC(postfix1, postfix2) \
 532     s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
 533     s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
 534     s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
 535
 536         if(s->lavc_build && s->lavc_build<4653)
 537             s->workaround_bugs|= FF_BUG_STD_QPEL;
 538
 539         if(s->lavc_build && s->lavc_build<4655)
 540             s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
 541
 542         if(s->lavc_build && s->lavc_build<4670){
 543             s->workaround_bugs|= FF_BUG_EDGE;
 544         }
 545
 546         if(s->divx_version)
 547             s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
 548 //printf("padding_bug_score: %d\n", s->padding_bug_score);
 549         if(s->divx_version==501 && s->divx_build==20020416)
 550             s->padding_bug_score= 256*256*256*64;
 551
 552         if(s->divx_version && s->divx_version<500){
 553             s->workaround_bugs|= FF_BUG_EDGE;
 554         }
 555
 556 #if 0
 557         if(s->divx_version==500)
 558             s->padding_bug_score= 256*256*256*64;
 559
 560         /* very ugly XVID padding bug detection FIXME/XXX solve this differently
 561          * lets hope this at least works
 562          */
 563         if(   s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==0
 564            && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
 565             s->workaround_bugs|= FF_BUG_NO_PADDING;
 566
 567         if(s->lavc_build && s->lavc_build<4609) //FIXME not sure about the version num but a 4609 file seems ok
 568             s->workaround_bugs|= FF_BUG_NO_PADDING;
 569 #endif
 570     }
 571
 572     if(s->workaround_bugs& FF_BUG_STD_QPEL){
 573         SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
 574         SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
 575         SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
 576         SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
 577         SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
 578         SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
 579
 580         SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
 581         SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
 582         SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
 583         SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
 584         SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
 585         SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
 586     }
 587
 588     if(avctx->debug & FF_DEBUG_BUGS)
 589         av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
 590                s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
 591                s->divx_packed ? "p" : "");
 592
 593 #if 0 // dump bits per frame / qp / complexity
 594 {
 595     static FILE *f=NULL;
 596     if(!f) f=fopen("rate_qp_cplx.txt", "w");
 597     fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
 598 }
 599 #endif
 600
 601         /* After H263 & mpeg4 header decode we have the height, width,*/
 602         /* and other parameters. So then we could init the picture   */
 603         /* FIXME: By the way H263 decoder is evolving it should have */
 604         /* an H263EncContext                                         */
 605
 606     if (   s->width != avctx->width || s->height != avctx->height) {
 607         /* H.263 could change picture size any time */
 608         ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
 609         s->parse_context.buffer=0;
 610         MPV_common_end(s);
 611         s->parse_context= pc;
 612     }
 613     if (!s->context_initialized) {
 614         avctx->width = s->width;
 615         avctx->height = s->height;
 616
 617         goto retry;
 618     }
 619
 620     if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P))
 621         s->gob_index = ff_h263_get_gob_height(s);
 622
 623     // for hurry_up==5
 624     s->current_picture.pict_type= s->pict_type;
 625     s->current_picture.key_frame= s->pict_type == I_TYPE;
 626
 627     /* skip b frames if we dont have reference frames */
 628     if(s->last_picture_ptr==NULL && s->pict_type==B_TYPE) return get_consumed_bytes(s, buf_size);
 629     /* skip b frames if we are in a hurry */
 630     if(avctx->hurry_up && s->pict_type==B_TYPE) return get_consumed_bytes(s, buf_size);
 631     /* skip everything if we are in a hurry>=5 */
 632     if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
 633
 634     if(s->next_p_frame_damaged){
 635         if(s->pict_type==B_TYPE)
 636             return get_consumed_bytes(s, buf_size);
 637         else
 638             s->next_p_frame_damaged=0;
 639     }
 640
 641     if(MPV_frame_start(s, avctx) < 0)
 642         return -1;
 643
 644 #ifdef DEBUG
 645     printf("qscale=%d\n", s->qscale);
 646 #endif
 647
 648     ff_er_frame_start(s);
 649
 650     //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
 651     //which isnt available before MPV_frame_start()
 652     if (s->msmpeg4_version==5){
 653         if(ff_wmv2_decode_secondary_picture_header(s) < 0)
 654             return -1;
 655     }
 656
 657     /* decode each macroblock */
 658     s->mb_x=0;
 659     s->mb_y=0;
 660
 661     decode_slice(s);
 662     while(s->mb_y<s->mb_height){
 663         if(s->msmpeg4_version){
 664             if(s->mb_x!=0 || (s->mb_y%s->slice_height)!=0 || get_bits_count(&s->gb) > s->gb.size_in_bits)
 665                 break;
 666         }else{
 667             if(ff_h263_resync(s)<0)
 668                 break;
 669         }
 670
 671         if(s->msmpeg4_version<4 && s->h263_pred)
 672             ff_mpeg4_clean_buffers(s);
 673
 674         decode_slice(s);
 675     }
 676
 677     if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==I_TYPE)
 678         if(msmpeg4_decode_ext_header(s, buf_size) < 0){
 679             s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
 680         }
 681
 682     /* divx 5.01+ bistream reorder stuff */
 683     if(s->codec_id==CODEC_ID_MPEG4 && s->bitstream_buffer_size==0 && s->divx_packed){
 684         int current_pos= get_bits_count(&s->gb)>>3;
 685
 686         if(   buf_size - current_pos > 5
 687            && buf_size - current_pos < BITSTREAM_BUFFER_SIZE){
 688             int i;
 689             int startcode_found=0;
 690             for(i=current_pos; i<buf_size-3; i++){
 691                 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
 692                     startcode_found=1;
 693                     break;
 694                 }
 695             }
 696             if(startcode_found){
 697                 memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
 698                 s->bitstream_buffer_size= buf_size - current_pos;
 699             }
 700         }
 701     }
 702
 703     ff_er_frame_end(s);
 704
 705     MPV_frame_end(s);
 706
 707 assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);
 708 assert(s->current_picture.pict_type == s->pict_type);
 709     if(s->pict_type==B_TYPE || s->low_delay){
 710         *pict= *(AVFrame*)&s->current_picture;
 711         ff_print_debug_info(s, s->current_picture_ptr);
 712     } else {
 713         *pict= *(AVFrame*)&s->last_picture;
 714         ff_print_debug_info(s, s->last_picture_ptr);
 715     }
 716
 717     /* Return the Picture timestamp as the frame number */
 718     /* we substract 1 because it is added on utils.c    */
 719     avctx->frame_number = s->picture_number - 1;
 720
 721     /* dont output the last pic after seeking */
 722     if(s->last_picture_ptr || s->low_delay)
 723         *data_size = sizeof(AVFrame);
 724 #ifdef PRINT_FRAME_TIME
 725 printf("%Ld\n", rdtsc()-time);
 726 #endif
 727
 728     return get_consumed_bytes(s, buf_size);
 729 }
 730
 731 static const AVOption mpeg4_decoptions[] =
 732 {
 733     AVOPTION_SUB(avoptions_workaround_bug),
 734     AVOPTION_END()
 735 };
 736
 737 AVCodec mpeg4_decoder = {
 738     "mpeg4",
 739     CODEC_TYPE_VIDEO,
 740     CODEC_ID_MPEG4,
 741     sizeof(MpegEncContext),
 742     ff_h263_decode_init,
 743     NULL,
 744     ff_h263_decode_end,
 745     ff_h263_decode_frame,
 746     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
 747     .options = mpeg4_decoptions,
 748     .flush= ff_mpeg_flush,
 749 };
 750
 751 AVCodec h263_decoder = {
 752     "h263",
 753     CODEC_TYPE_VIDEO,
 754     CODEC_ID_H263,
 755     sizeof(MpegEncContext),
 756     ff_h263_decode_init,
 757     NULL,
 758     ff_h263_decode_end,
 759     ff_h263_decode_frame,
 760     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
 761     .flush= ff_mpeg_flush,
 762 };
 763
 764 AVCodec msmpeg4v1_decoder = {
 765     "msmpeg4v1",
 766     CODEC_TYPE_VIDEO,
 767     CODEC_ID_MSMPEG4V1,
 768     sizeof(MpegEncContext),
 769     ff_h263_decode_init,
 770     NULL,
 771     ff_h263_decode_end,
 772     ff_h263_decode_frame,
 773     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 774     mpeg4_decoptions,
 775 };
 776
 777 AVCodec msmpeg4v2_decoder = {
 778     "msmpeg4v2",
 779     CODEC_TYPE_VIDEO,
 780     CODEC_ID_MSMPEG4V2,
 781     sizeof(MpegEncContext),
 782     ff_h263_decode_init,
 783     NULL,
 784     ff_h263_decode_end,
 785     ff_h263_decode_frame,
 786     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 787     mpeg4_decoptions,
 788 };
 789
 790 AVCodec msmpeg4v3_decoder = {
 791     "msmpeg4",
 792     CODEC_TYPE_VIDEO,
 793     CODEC_ID_MSMPEG4V3,
 794     sizeof(MpegEncContext),
 795     ff_h263_decode_init,
 796     NULL,
 797     ff_h263_decode_end,
 798     ff_h263_decode_frame,
 799     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 800     .options = mpeg4_decoptions,
 801 };
 802
 803 AVCodec wmv1_decoder = {
 804     "wmv1",
 805     CODEC_TYPE_VIDEO,
 806     CODEC_ID_WMV1,
 807     sizeof(MpegEncContext),
 808     ff_h263_decode_init,
 809     NULL,
 810     ff_h263_decode_end,
 811     ff_h263_decode_frame,
 812     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 813     mpeg4_decoptions,
 814 };
 815
 816 AVCodec h263i_decoder = {
 817     "h263i",
 818     CODEC_TYPE_VIDEO,
 819     CODEC_ID_H263I,
 820     sizeof(MpegEncContext),
 821     ff_h263_decode_init,
 822     NULL,
 823     ff_h263_decode_end,
 824     ff_h263_decode_frame,
 825     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 826     mpeg4_decoptions,
 827 };
 828
 829 AVCodec flv_decoder = {
 830     "flv",
 831     CODEC_TYPE_VIDEO,
 832     CODEC_ID_FLV1,
 833     sizeof(MpegEncContext),
 834     ff_h263_decode_init,
 835     NULL,
 836     ff_h263_decode_end,
 837     ff_h263_decode_frame,
 838     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1
 839 };