git.sesse.net Git - ffmpeg/blob - libavcodec/h263dec.c

   1 /*
   2  * H.263 decoder
   3  * Copyright (c) 2001 Fabrice Bellard.
   4  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 /**
  22  * @file h263dec.c
  23  * H.263 decoder.
  24  */
  25
  26 #include "avcodec.h"
  27 #include "dsputil.h"
  28 #include "mpegvideo.h"
  29
  30 //#define DEBUG
  31 //#define PRINT_FRAME_TIME
  32
  33 int ff_h263_decode_init(AVCodecContext *avctx)
  34 {
  35     MpegEncContext *s = avctx->priv_data;
  36
  37     s->avctx = avctx;
  38     s->out_format = FMT_H263;
  39
  40     s->width  = avctx->coded_width;
  41     s->height = avctx->coded_height;
  42     s->workaround_bugs= avctx->workaround_bugs;
  43
  44     // set defaults
  45     MPV_decode_defaults(s);
  46     s->quant_precision=5;
  47     s->decode_mb= ff_h263_decode_mb;
  48     s->low_delay= 1;
  49     avctx->pix_fmt= PIX_FMT_YUV420P;
  50     s->unrestricted_mv= 1;
  51
  52     /* select sub codec */
  53     switch(avctx->codec->id) {
  54     case CODEC_ID_H263:
  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_WMV3:
  89         s->h263_msmpeg4 = 1;
  90         s->h263_pred = 1;
  91         s->msmpeg4_version=6;
  92         break;
  93     case CODEC_ID_H263I:
  94         break;
  95     case CODEC_ID_FLV1:
  96         s->h263_flv = 1;
  97         break;
  98     default:
  99         return -1;
 100     }
 101     s->codec_id= avctx->codec->id;
 102
 103     /* for h263, we allocate the images after having read the header */
 104     if (avctx->codec->id != CODEC_ID_H263 && avctx->codec->id != CODEC_ID_MPEG4)
 105         if (MPV_common_init(s) < 0)
 106             return -1;
 107
 108     if (s->h263_msmpeg4)
 109         ff_msmpeg4_decode_init(s);
 110     else
 111         h263_decode_init_vlc(s);
 112
 113     return 0;
 114 }
 115
 116 int ff_h263_decode_end(AVCodecContext *avctx)
 117 {
 118     MpegEncContext *s = avctx->priv_data;
 119
 120     MPV_common_end(s);
 121     return 0;
 122 }
 123
 124 /**
 125  * returns the number of bytes consumed for building the current frame
 126  */
 127 static int get_consumed_bytes(MpegEncContext *s, int buf_size){
 128     int pos= (get_bits_count(&s->gb)+7)>>3;
 129
 130     if(s->divx_packed){
 131         //we would have to scan through the whole buf to handle the weird reordering ...
 132         return buf_size;
 133     }else if(s->flags&CODEC_FLAG_TRUNCATED){
 134         pos -= s->parse_context.last_index;
 135         if(pos<0) pos=0; // padding is not really read so this might be -1
 136         return pos;
 137     }else{
 138         if(pos==0) pos=1; //avoid infinite loops (i doubt thats needed but ...)
 139         if(pos+10>buf_size) pos=buf_size; // oops ;)
 140
 141         return pos;
 142     }
 143 }
 144
 145 static int decode_slice(MpegEncContext *s){
 146     const int part_mask= s->partitioned_frame ? (AC_END|AC_ERROR) : 0x7F;
 147     const int mb_size= 16>>s->avctx->lowres;
 148     s->last_resync_gb= s->gb;
 149     s->first_slice_line= 1;
 150
 151     s->resync_mb_x= s->mb_x;
 152     s->resync_mb_y= s->mb_y;
 153
 154     ff_set_qscale(s, s->qscale);
 155
 156     if(s->partitioned_frame){
 157         const int qscale= s->qscale;
 158
 159         if(s->codec_id==CODEC_ID_MPEG4){
 160             if(ff_mpeg4_decode_partitions(s) < 0)
 161                 return -1;
 162         }
 163
 164         /* restore variables which were modified */
 165         s->first_slice_line=1;
 166         s->mb_x= s->resync_mb_x;
 167         s->mb_y= s->resync_mb_y;
 168         ff_set_qscale(s, qscale);
 169     }
 170
 171     for(; s->mb_y < s->mb_height; s->mb_y++) {
 172         /* per-row end of slice checks */
 173         if(s->msmpeg4_version){
 174             if(s->resync_mb_y + s->slice_height == s->mb_y){
 175                 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);
 176
 177                 return 0;
 178             }
 179         }
 180
 181         if(s->msmpeg4_version==1){
 182             s->last_dc[0]=
 183             s->last_dc[1]=
 184             s->last_dc[2]= 128;
 185         }
 186
 187         ff_init_block_index(s);
 188         for(; s->mb_x < s->mb_width; s->mb_x++) {
 189             int ret;
 190
 191             ff_update_block_index(s);
 192
 193             if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
 194                 s->first_slice_line=0;
 195             }
 196
 197             /* DCT & quantize */
 198
 199             s->mv_dir = MV_DIR_FORWARD;
 200             s->mv_type = MV_TYPE_16X16;
 201 //            s->mb_skipped = 0;
 202 //printf("%d %d %06X\n", ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
 203             ret= s->decode_mb(s, s->block);
 204
 205             if (s->pict_type!=B_TYPE)
 206                 ff_h263_update_motion_val(s);
 207
 208             if(ret<0){
 209                 const int xy= s->mb_x + s->mb_y*s->mb_stride;
 210                 if(ret==SLICE_END){
 211                     MPV_decode_mb(s, s->block);
 212                     if(s->loop_filter)
 213                         ff_h263_loop_filter(s);
 214
 215 //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));
 216                     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);
 217
 218                     s->padding_bug_score--;
 219
 220                     if(++s->mb_x >= s->mb_width){
 221                         s->mb_x=0;
 222                         ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
 223                         s->mb_y++;
 224                     }
 225                     return 0;
 226                 }else if(ret==SLICE_NOEND){
 227                     av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy);
 228                     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);
 229                     return -1;
 230                 }
 231                 av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
 232                 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);
 233
 234                 return -1;
 235             }
 236
 237             MPV_decode_mb(s, s->block);
 238             if(s->loop_filter)
 239                 ff_h263_loop_filter(s);
 240         }
 241
 242         ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
 243
 244         s->mb_x= 0;
 245     }
 246
 247     assert(s->mb_x==0 && s->mb_y==s->mb_height);
 248
 249     /* try to detect the padding bug */
 250     if(      s->codec_id==CODEC_ID_MPEG4
 251        &&   (s->workaround_bugs&FF_BUG_AUTODETECT)
 252        &&    s->gb.size_in_bits - get_bits_count(&s->gb) >=0
 253        &&    s->gb.size_in_bits - get_bits_count(&s->gb) < 48
 254 //       &&   !s->resync_marker
 255        &&   !s->data_partitioning){
 256
 257         const int bits_count= get_bits_count(&s->gb);
 258         const int bits_left = s->gb.size_in_bits - bits_count;
 259
 260         if(bits_left==0){
 261             s->padding_bug_score+=16;
 262         } else if(bits_left != 1){
 263             int v= show_bits(&s->gb, 8);
 264             v|= 0x7F >> (7-(bits_count&7));
 265
 266             if(v==0x7F && bits_left<=8)
 267                 s->padding_bug_score--;
 268             else if(v==0x7F && ((get_bits_count(&s->gb)+8)&8) && bits_left<=16)
 269                 s->padding_bug_score+= 4;
 270             else
 271                 s->padding_bug_score++;
 272         }
 273     }
 274
 275     if(s->workaround_bugs&FF_BUG_AUTODETECT){
 276         if(s->padding_bug_score > -2 && !s->data_partitioning /*&& (s->divx_version || !s->resync_marker)*/)
 277             s->workaround_bugs |=  FF_BUG_NO_PADDING;
 278         else
 279             s->workaround_bugs &= ~FF_BUG_NO_PADDING;
 280     }
 281
 282     // handle formats which don't have unique end markers
 283     if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
 284         int left= s->gb.size_in_bits - get_bits_count(&s->gb);
 285         int max_extra=7;
 286
 287         /* no markers in M$ crap */
 288         if(s->msmpeg4_version && s->pict_type==I_TYPE)
 289             max_extra+= 17;
 290
 291         /* buggy padding but the frame should still end approximately at the bitstream end */
 292         if((s->workaround_bugs&FF_BUG_NO_PADDING) && s->error_resilience>=3)
 293             max_extra+= 48;
 294         else if((s->workaround_bugs&FF_BUG_NO_PADDING))
 295             max_extra+= 256*256*256*64;
 296
 297         if(left>max_extra){
 298             av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
 299         }
 300         else if(left<0){
 301             av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
 302         }else
 303             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);
 304
 305         return 0;
 306     }
 307
 308     av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
 309             s->gb.size_in_bits - get_bits_count(&s->gb),
 310             show_bits(&s->gb, 24), s->padding_bug_score);
 311
 312     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);
 313
 314     return -1;
 315 }
 316
 317 /**
 318  * finds the end of the current frame in the bitstream.
 319  * @return the position of the first byte of the next frame, or -1
 320  */
 321 int ff_mpeg4_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size){
 322     int vop_found, i;
 323     uint32_t state;
 324
 325     vop_found= pc->frame_start_found;
 326     state= pc->state;
 327
 328     i=0;
 329     if(!vop_found){
 330         for(i=0; i<buf_size; i++){
 331             state= (state<<8) | buf[i];
 332             if(state == 0x1B6){
 333                 i++;
 334                 vop_found=1;
 335                 break;
 336             }
 337         }
 338     }
 339
 340     if(vop_found){
 341         /* EOF considered as end of frame */
 342         if (buf_size == 0)
 343             return 0;
 344         for(; i<buf_size; i++){
 345             state= (state<<8) | buf[i];
 346             if((state&0xFFFFFF00) == 0x100){
 347                 pc->frame_start_found=0;
 348                 pc->state=-1;
 349                 return i-3;
 350             }
 351         }
 352     }
 353     pc->frame_start_found= vop_found;
 354     pc->state= state;
 355     return END_NOT_FOUND;
 356 }
 357
 358 static int h263_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size){
 359     int vop_found, i;
 360     uint32_t state;
 361
 362     vop_found= pc->frame_start_found;
 363     state= pc->state;
 364
 365     i=0;
 366     if(!vop_found){
 367         for(i=0; i<buf_size; i++){
 368             state= (state<<8) | buf[i];
 369             if(state>>(32-22) == 0x20){
 370                 i++;
 371                 vop_found=1;
 372                 break;
 373             }
 374         }
 375     }
 376
 377     if(vop_found){
 378       for(; i<buf_size; i++){
 379         state= (state<<8) | buf[i];
 380         if(state>>(32-22) == 0x20){
 381             pc->frame_start_found=0;
 382             pc->state=-1;
 383             return i-3;
 384         }
 385       }
 386     }
 387     pc->frame_start_found= vop_found;
 388     pc->state= state;
 389
 390     return END_NOT_FOUND;
 391 }
 392
 393 static int h263_parse(AVCodecParserContext *s,
 394                            AVCodecContext *avctx,
 395                            uint8_t **poutbuf, int *poutbuf_size,
 396                            const uint8_t *buf, int buf_size)
 397 {
 398     ParseContext *pc = s->priv_data;
 399     int next;
 400
 401     next= h263_find_frame_end(pc, buf, buf_size);
 402
 403     if (ff_combine_frame(pc, next, (uint8_t **)&buf, &buf_size) < 0) {
 404         *poutbuf = NULL;
 405         *poutbuf_size = 0;
 406         return buf_size;
 407     }
 408
 409     *poutbuf = (uint8_t *)buf;
 410     *poutbuf_size = buf_size;
 411     return next;
 412 }
 413
 414 int ff_h263_decode_frame(AVCodecContext *avctx,
 415                              void *data, int *data_size,
 416                              uint8_t *buf, int buf_size)
 417 {
 418     MpegEncContext *s = avctx->priv_data;
 419     int ret;
 420     AVFrame *pict = data;
 421
 422 #ifdef PRINT_FRAME_TIME
 423 uint64_t time= rdtsc();
 424 #endif
 425 #ifdef DEBUG
 426     printf("*****frame %d size=%d\n", avctx->frame_number, buf_size);
 427     printf("bytes=%x %x %x %x\n", buf[0], buf[1], buf[2], buf[3]);
 428 #endif
 429     s->flags= avctx->flags;
 430     s->flags2= avctx->flags2;
 431
 432     /* no supplementary picture */
 433     if (buf_size == 0) {
 434         /* special case for last picture */
 435         if (s->low_delay==0 && s->next_picture_ptr) {
 436             *pict= *(AVFrame*)s->next_picture_ptr;
 437             s->next_picture_ptr= NULL;
 438
 439             *data_size = sizeof(AVFrame);
 440         }
 441
 442         return 0;
 443     }
 444
 445     if(s->flags&CODEC_FLAG_TRUNCATED){
 446         int next;
 447
 448         if(s->codec_id==CODEC_ID_MPEG4){
 449             next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
 450         }else if(s->codec_id==CODEC_ID_H263){
 451             next= h263_find_frame_end(&s->parse_context, buf, buf_size);
 452         }else{
 453             av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n");
 454             return -1;
 455         }
 456
 457         if( ff_combine_frame(&s->parse_context, next, &buf, &buf_size) < 0 )
 458             return buf_size;
 459     }
 460
 461
 462 retry:
 463
 464     if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
 465         init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
 466     }else
 467         init_get_bits(&s->gb, buf, buf_size*8);
 468     s->bitstream_buffer_size=0;
 469
 470     if (!s->context_initialized) {
 471         if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
 472             return -1;
 473     }
 474
 475     //we need to set current_picture_ptr before reading the header, otherwise we cant store anyting im there
 476     if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){
 477         int i= ff_find_unused_picture(s, 0);
 478         s->current_picture_ptr= &s->picture[i];
 479     }
 480
 481     /* let's go :-) */
 482     if (s->msmpeg4_version==5) {
 483         ret= ff_wmv2_decode_picture_header(s);
 484     } else if (s->msmpeg4_version) {
 485         ret = msmpeg4_decode_picture_header(s);
 486     } else if (s->h263_pred) {
 487         if(s->avctx->extradata_size && s->picture_number==0){
 488             GetBitContext gb;
 489
 490             init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
 491             ret = ff_mpeg4_decode_picture_header(s, &gb);
 492         }
 493         ret = ff_mpeg4_decode_picture_header(s, &s->gb);
 494
 495         if(s->flags& CODEC_FLAG_LOW_DELAY)
 496             s->low_delay=1;
 497     } else if (s->codec_id == CODEC_ID_H263I) {
 498         ret = intel_h263_decode_picture_header(s);
 499     } else if (s->h263_flv) {
 500         ret = flv_h263_decode_picture_header(s);
 501     } else {
 502         ret = h263_decode_picture_header(s);
 503     }
 504
 505     if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size);
 506
 507     /* skip if the header was thrashed */
 508     if (ret < 0){
 509         av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
 510         return -1;
 511     }
 512
 513     avctx->has_b_frames= !s->low_delay;
 514
 515     if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
 516         if(s->avctx->stream_codec_tag == ff_get_fourcc("XVID") ||
 517            s->avctx->codec_tag == ff_get_fourcc("XVID") || s->avctx->codec_tag == ff_get_fourcc("XVIX") ||
 518            s->avctx->codec_tag == ff_get_fourcc("RMP4"))
 519             s->xvid_build= -1;
 520 #if 0
 521         if(s->avctx->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
 522            && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
 523             s->xvid_build= -1;
 524 #endif
 525     }
 526
 527     if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
 528         if(s->avctx->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
 529             s->divx_version= 400; //divx 4
 530     }
 531
 532     if(s->xvid_build && s->divx_version){
 533         s->divx_version=
 534         s->divx_build= 0;
 535     }
 536
 537     if(s->workaround_bugs&FF_BUG_AUTODETECT){
 538         if(s->avctx->codec_tag == ff_get_fourcc("XVIX"))
 539             s->workaround_bugs|= FF_BUG_XVID_ILACE;
 540
 541         if(s->avctx->codec_tag == ff_get_fourcc("UMP4")){
 542             s->workaround_bugs|= FF_BUG_UMP4;
 543         }
 544
 545         if(s->divx_version>=500){
 546             s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
 547         }
 548
 549         if(s->divx_version>502){
 550             s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
 551         }
 552
 553         if(s->xvid_build && s->xvid_build<=3)
 554             s->padding_bug_score= 256*256*256*64;
 555
 556         if(s->xvid_build && s->xvid_build<=1)
 557             s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
 558
 559         if(s->xvid_build && s->xvid_build<=12)
 560             s->workaround_bugs|= FF_BUG_EDGE;
 561
 562         if(s->xvid_build && s->xvid_build<=32)
 563             s->workaround_bugs|= FF_BUG_DC_CLIP;
 564
 565 #define SET_QPEL_FUNC(postfix1, postfix2) \
 566     s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
 567     s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
 568     s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
 569
 570         if(s->lavc_build && s->lavc_build<4653)
 571             s->workaround_bugs|= FF_BUG_STD_QPEL;
 572
 573         if(s->lavc_build && s->lavc_build<4655)
 574             s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
 575
 576         if(s->lavc_build && s->lavc_build<4670){
 577             s->workaround_bugs|= FF_BUG_EDGE;
 578         }
 579
 580         if(s->lavc_build && s->lavc_build<=4712)
 581             s->workaround_bugs|= FF_BUG_DC_CLIP;
 582
 583         if(s->divx_version)
 584             s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
 585 //printf("padding_bug_score: %d\n", s->padding_bug_score);
 586         if(s->divx_version==501 && s->divx_build==20020416)
 587             s->padding_bug_score= 256*256*256*64;
 588
 589         if(s->divx_version && s->divx_version<500){
 590             s->workaround_bugs|= FF_BUG_EDGE;
 591         }
 592
 593         if(s->divx_version)
 594             s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
 595 #if 0
 596         if(s->divx_version==500)
 597             s->padding_bug_score= 256*256*256*64;
 598
 599         /* very ugly XVID padding bug detection FIXME/XXX solve this differently
 600          * lets hope this at least works
 601          */
 602         if(   s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==0
 603            && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
 604             s->workaround_bugs|= FF_BUG_NO_PADDING;
 605
 606         if(s->lavc_build && s->lavc_build<4609) //FIXME not sure about the version num but a 4609 file seems ok
 607             s->workaround_bugs|= FF_BUG_NO_PADDING;
 608 #endif
 609     }
 610
 611     if(s->workaround_bugs& FF_BUG_STD_QPEL){
 612         SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
 613         SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
 614         SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
 615         SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
 616         SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
 617         SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
 618
 619         SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
 620         SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
 621         SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
 622         SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
 623         SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
 624         SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
 625     }
 626
 627     if(avctx->debug & FF_DEBUG_BUGS)
 628         av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
 629                s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
 630                s->divx_packed ? "p" : "");
 631
 632 #if 0 // dump bits per frame / qp / complexity
 633 {
 634     static FILE *f=NULL;
 635     if(!f) f=fopen("rate_qp_cplx.txt", "w");
 636     fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
 637 }
 638 #endif
 639
 640 #if defined(HAVE_MMX) && defined(CONFIG_GPL)
 641     if(s->codec_id == CODEC_ID_MPEG4 && s->xvid_build && avctx->idct_algo == FF_IDCT_AUTO && (mm_flags & MM_MMX)){
 642         avctx->idct_algo= FF_IDCT_XVIDMMX;
 643         avctx->coded_width= 0; // force reinit
 644 //        dsputil_init(&s->dsp, avctx);
 645         s->picture_number=0;
 646     }
 647 #endif
 648
 649         /* After H263 & mpeg4 header decode we have the height, width,*/
 650         /* and other parameters. So then we could init the picture   */
 651         /* FIXME: By the way H263 decoder is evolving it should have */
 652         /* an H263EncContext                                         */
 653
 654     if (   s->width  != avctx->coded_width
 655         || s->height != avctx->coded_height) {
 656         /* H.263 could change picture size any time */
 657         ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
 658         s->parse_context.buffer=0;
 659         MPV_common_end(s);
 660         s->parse_context= pc;
 661     }
 662     if (!s->context_initialized) {
 663         avcodec_set_dimensions(avctx, s->width, s->height);
 664
 665         goto retry;
 666     }
 667
 668     if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P))
 669         s->gob_index = ff_h263_get_gob_height(s);
 670
 671     // for hurry_up==5
 672     s->current_picture.pict_type= s->pict_type;
 673     s->current_picture.key_frame= s->pict_type == I_TYPE;
 674
 675     /* skip B-frames if we don't have reference frames */
 676     if(s->last_picture_ptr==NULL && (s->pict_type==B_TYPE || s->dropable)) return get_consumed_bytes(s, buf_size);
 677     /* skip b frames if we are in a hurry */
 678     if(avctx->hurry_up && s->pict_type==B_TYPE) return get_consumed_bytes(s, buf_size);
 679     if(   (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==B_TYPE)
 680        || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=I_TYPE)
 681        ||  avctx->skip_frame >= AVDISCARD_ALL)
 682         return get_consumed_bytes(s, buf_size);
 683     /* skip everything if we are in a hurry>=5 */
 684     if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
 685
 686     if(s->next_p_frame_damaged){
 687         if(s->pict_type==B_TYPE)
 688             return get_consumed_bytes(s, buf_size);
 689         else
 690             s->next_p_frame_damaged=0;
 691     }
 692
 693     if(MPV_frame_start(s, avctx) < 0)
 694         return -1;
 695
 696 #ifdef DEBUG
 697     av_log(avctx, AV_LOG_DEBUG, "qscale=%d\n", s->qscale);
 698 #endif
 699
 700     ff_er_frame_start(s);
 701
 702     //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
 703     //which isnt available before MPV_frame_start()
 704     if (s->msmpeg4_version==5){
 705         if(ff_wmv2_decode_secondary_picture_header(s) < 0)
 706             return -1;
 707     }
 708
 709     /* decode each macroblock */
 710     s->mb_x=0;
 711     s->mb_y=0;
 712
 713     decode_slice(s);
 714     while(s->mb_y<s->mb_height){
 715         if(s->msmpeg4_version){
 716             if(s->mb_x!=0 || (s->mb_y%s->slice_height)!=0 || get_bits_count(&s->gb) > s->gb.size_in_bits)
 717                 break;
 718         }else{
 719             if(ff_h263_resync(s)<0)
 720                 break;
 721         }
 722
 723         if(s->msmpeg4_version<4 && s->h263_pred)
 724             ff_mpeg4_clean_buffers(s);
 725
 726         decode_slice(s);
 727     }
 728
 729     if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==I_TYPE)
 730         if(msmpeg4_decode_ext_header(s, buf_size) < 0){
 731             s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
 732         }
 733
 734     /* divx 5.01+ bistream reorder stuff */
 735     if(s->codec_id==CODEC_ID_MPEG4 && s->bitstream_buffer_size==0 && s->divx_packed){
 736         int current_pos= get_bits_count(&s->gb)>>3;
 737         int startcode_found=0;
 738
 739         if(buf_size - current_pos > 5){
 740             int i;
 741             for(i=current_pos; i<buf_size-3; i++){
 742                 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
 743                     startcode_found=1;
 744                     break;
 745                 }
 746             }
 747         }
 748         if(s->gb.buffer == s->bitstream_buffer && buf_size>20){ //xvid style
 749             startcode_found=1;
 750             current_pos=0;
 751         }
 752
 753         if(startcode_found){
 754             s->bitstream_buffer= av_fast_realloc(
 755                 s->bitstream_buffer,
 756                 &s->allocated_bitstream_buffer_size,
 757                 buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
 758             memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
 759             s->bitstream_buffer_size= buf_size - current_pos;
 760         }
 761     }
 762
 763     ff_er_frame_end(s);
 764
 765     MPV_frame_end(s);
 766
 767 assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);
 768 assert(s->current_picture.pict_type == s->pict_type);
 769     if (s->pict_type == B_TYPE || s->low_delay) {
 770         *pict= *(AVFrame*)s->current_picture_ptr;
 771     } else if (s->last_picture_ptr != NULL) {
 772         *pict= *(AVFrame*)s->last_picture_ptr;
 773     }
 774
 775     if(s->last_picture_ptr || s->low_delay){
 776         *data_size = sizeof(AVFrame);
 777         ff_print_debug_info(s, pict);
 778     }
 779
 780     /* Return the Picture timestamp as the frame number */
 781     /* we substract 1 because it is added on utils.c    */
 782     avctx->frame_number = s->picture_number - 1;
 783
 784 #ifdef PRINT_FRAME_TIME
 785 av_log(avctx, AV_LOG_DEBUG, "%Ld\n", rdtsc()-time);
 786 #endif
 787
 788     return get_consumed_bytes(s, buf_size);
 789 }
 790
 791 AVCodec mpeg4_decoder = {
 792     "mpeg4",
 793     CODEC_TYPE_VIDEO,
 794     CODEC_ID_MPEG4,
 795     sizeof(MpegEncContext),
 796     ff_h263_decode_init,
 797     NULL,
 798     ff_h263_decode_end,
 799     ff_h263_decode_frame,
 800     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
 801     .flush= ff_mpeg_flush,
 802 };
 803
 804 AVCodec h263_decoder = {
 805     "h263",
 806     CODEC_TYPE_VIDEO,
 807     CODEC_ID_H263,
 808     sizeof(MpegEncContext),
 809     ff_h263_decode_init,
 810     NULL,
 811     ff_h263_decode_end,
 812     ff_h263_decode_frame,
 813     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
 814     .flush= ff_mpeg_flush,
 815 };
 816
 817 AVCodec msmpeg4v1_decoder = {
 818     "msmpeg4v1",
 819     CODEC_TYPE_VIDEO,
 820     CODEC_ID_MSMPEG4V1,
 821     sizeof(MpegEncContext),
 822     ff_h263_decode_init,
 823     NULL,
 824     ff_h263_decode_end,
 825     ff_h263_decode_frame,
 826     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 827 };
 828
 829 AVCodec msmpeg4v2_decoder = {
 830     "msmpeg4v2",
 831     CODEC_TYPE_VIDEO,
 832     CODEC_ID_MSMPEG4V2,
 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 };
 840
 841 AVCodec msmpeg4v3_decoder = {
 842     "msmpeg4",
 843     CODEC_TYPE_VIDEO,
 844     CODEC_ID_MSMPEG4V3,
 845     sizeof(MpegEncContext),
 846     ff_h263_decode_init,
 847     NULL,
 848     ff_h263_decode_end,
 849     ff_h263_decode_frame,
 850     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 851 };
 852
 853 AVCodec wmv1_decoder = {
 854     "wmv1",
 855     CODEC_TYPE_VIDEO,
 856     CODEC_ID_WMV1,
 857     sizeof(MpegEncContext),
 858     ff_h263_decode_init,
 859     NULL,
 860     ff_h263_decode_end,
 861     ff_h263_decode_frame,
 862     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 863 };
 864
 865 AVCodec h263i_decoder = {
 866     "h263i",
 867     CODEC_TYPE_VIDEO,
 868     CODEC_ID_H263I,
 869     sizeof(MpegEncContext),
 870     ff_h263_decode_init,
 871     NULL,
 872     ff_h263_decode_end,
 873     ff_h263_decode_frame,
 874     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 875 };
 876
 877 AVCodec flv_decoder = {
 878     "flv",
 879     CODEC_TYPE_VIDEO,
 880     CODEC_ID_FLV1,
 881     sizeof(MpegEncContext),
 882     ff_h263_decode_init,
 883     NULL,
 884     ff_h263_decode_end,
 885     ff_h263_decode_frame,
 886     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1
 887 };
 888
 889 AVCodecParser h263_parser = {
 890     { CODEC_ID_H263 },
 891     sizeof(ParseContext),
 892     NULL,
 893     h263_parse,
 894     ff_parse_close,
 895 };