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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  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_H263I:
  89         break;
  90     case CODEC_ID_FLV1:
  91         s->h263_flv = 1;
  92         break;
  93     default:
  94         return -1;
  95     }
  96     s->codec_id= avctx->codec->id;
  97
  98     /* for h263, we allocate the images after having read the header */
  99     if (avctx->codec->id != CODEC_ID_H263 && avctx->codec->id != CODEC_ID_MPEG4)
 100         if (MPV_common_init(s) < 0)
 101             return -1;
 102
 103     if (s->h263_msmpeg4)
 104         ff_msmpeg4_decode_init(s);
 105     else
 106         h263_decode_init_vlc(s);
 107
 108     return 0;
 109 }
 110
 111 int ff_h263_decode_end(AVCodecContext *avctx)
 112 {
 113     MpegEncContext *s = avctx->priv_data;
 114
 115     MPV_common_end(s);
 116     return 0;
 117 }
 118
 119 /**
 120  * retunrs the number of bytes consumed for building the current frame
 121  */
 122 static int get_consumed_bytes(MpegEncContext *s, int buf_size){
 123     int pos= (get_bits_count(&s->gb)+7)>>3;
 124
 125     if(s->divx_packed){
 126         //we would have to scan through the whole buf to handle the weird reordering ...
 127         return buf_size;
 128     }else if(s->flags&CODEC_FLAG_TRUNCATED){
 129         pos -= s->parse_context.last_index;
 130         if(pos<0) pos=0; // padding is not really read so this might be -1
 131         return pos;
 132     }else{
 133         if(pos==0) pos=1; //avoid infinite loops (i doubt thats needed but ...)
 134         if(pos+10>buf_size) pos=buf_size; // oops ;)
 135
 136         return pos;
 137     }
 138 }
 139
 140 static int decode_slice(MpegEncContext *s){
 141     const int part_mask= s->partitioned_frame ? (AC_END|AC_ERROR) : 0x7F;
 142     const int mb_size= 16>>s->avctx->lowres;
 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     ff_set_qscale(s, s->qscale);
 150
 151     if(s->partitioned_frame){
 152         const int qscale= s->qscale;
 153
 154         if(s->codec_id==CODEC_ID_MPEG4){
 155             if(ff_mpeg4_decode_partitions(s) < 0)
 156                 return -1;
 157         }
 158
 159         /* restore variables which were modified */
 160         s->first_slice_line=1;
 161         s->mb_x= s->resync_mb_x;
 162         s->mb_y= s->resync_mb_y;
 163         ff_set_qscale(s, qscale);
 164     }
 165
 166     for(; s->mb_y < s->mb_height; s->mb_y++) {
 167         /* per-row end of slice checks */
 168         if(s->msmpeg4_version){
 169             if(s->resync_mb_y + s->slice_height == s->mb_y){
 170                 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);
 171
 172                 return 0;
 173             }
 174         }
 175
 176         if(s->msmpeg4_version==1){
 177             s->last_dc[0]=
 178             s->last_dc[1]=
 179             s->last_dc[2]= 128;
 180         }
 181
 182         ff_init_block_index(s);
 183         for(; s->mb_x < s->mb_width; s->mb_x++) {
 184             int ret;
 185
 186             ff_update_block_index(s);
 187
 188             if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
 189                 s->first_slice_line=0;
 190             }
 191
 192             /* DCT & quantize */
 193             s->dsp.clear_blocks(s->block[0]);
 194
 195             s->mv_dir = MV_DIR_FORWARD;
 196             s->mv_type = MV_TYPE_16X16;
 197 //            s->mb_skiped = 0;
 198 //printf("%d %d %06X\n", ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
 199             ret= s->decode_mb(s, s->block);
 200
 201             if (s->pict_type!=B_TYPE)
 202                 ff_h263_update_motion_val(s);
 203
 204             if(ret<0){
 205                 const int xy= s->mb_x + s->mb_y*s->mb_stride;
 206                 if(ret==SLICE_END){
 207                     MPV_decode_mb(s, s->block);
 208                     if(s->loop_filter)
 209                         ff_h263_loop_filter(s);
 210
 211 //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));
 212                     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);
 213
 214                     s->padding_bug_score--;
 215
 216                     if(++s->mb_x >= s->mb_width){
 217                         s->mb_x=0;
 218                         ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
 219                         s->mb_y++;
 220                     }
 221                     return 0;
 222                 }else if(ret==SLICE_NOEND){
 223                     av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy);
 224                     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);
 225                     return -1;
 226                 }
 227                 av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
 228                 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);
 229
 230                 return -1;
 231             }
 232
 233             MPV_decode_mb(s, s->block);
 234             if(s->loop_filter)
 235                 ff_h263_loop_filter(s);
 236         }
 237
 238         ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
 239
 240         s->mb_x= 0;
 241     }
 242
 243     assert(s->mb_x==0 && s->mb_y==s->mb_height);
 244
 245     /* try to detect the padding bug */
 246     if(      s->codec_id==CODEC_ID_MPEG4
 247        &&   (s->workaround_bugs&FF_BUG_AUTODETECT)
 248        &&    s->gb.size_in_bits - get_bits_count(&s->gb) >=0
 249        &&    s->gb.size_in_bits - get_bits_count(&s->gb) < 48
 250 //       &&   !s->resync_marker
 251        &&   !s->data_partitioning){
 252
 253         const int bits_count= get_bits_count(&s->gb);
 254         const int bits_left = s->gb.size_in_bits - bits_count;
 255
 256         if(bits_left==0){
 257             s->padding_bug_score+=16;
 258         }else if(bits_left>8){
 259             s->padding_bug_score++;
 260         } else if(bits_left != 1){
 261             int v= show_bits(&s->gb, 8);
 262             v|= 0x7F >> (7-(bits_count&7));
 263
 264             if(v==0x7F)
 265                 s->padding_bug_score--;
 266             else
 267                 s->padding_bug_score++;
 268         }
 269     }
 270
 271     // handle formats which dont have unique end markers
 272     if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
 273         int left= s->gb.size_in_bits - get_bits_count(&s->gb);
 274         int max_extra=7;
 275
 276         /* no markers in M$ crap */
 277         if(s->msmpeg4_version && s->pict_type==I_TYPE)
 278             max_extra+= 17;
 279
 280         /* buggy padding but the frame should still end approximately at the bitstream end */
 281         if((s->workaround_bugs&FF_BUG_NO_PADDING) && s->error_resilience>=3)
 282             max_extra+= 48;
 283         else if((s->workaround_bugs&FF_BUG_NO_PADDING))
 284             max_extra+= 256*256*256*64;
 285
 286         if(left>max_extra){
 287             av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
 288         }
 289         else if(left<0){
 290             av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
 291         }else
 292             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);
 293
 294         return 0;
 295     }
 296
 297     av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
 298             s->gb.size_in_bits - get_bits_count(&s->gb),
 299             show_bits(&s->gb, 24), s->padding_bug_score);
 300
 301     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);
 302
 303     return -1;
 304 }
 305
 306 /**
 307  * finds the end of the current frame in the bitstream.
 308  * @return the position of the first byte of the next frame, or -1
 309  */
 310 int ff_mpeg4_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size){
 311     int vop_found, i;
 312     uint32_t state;
 313
 314     vop_found= pc->frame_start_found;
 315     state= pc->state;
 316
 317     i=0;
 318     if(!vop_found){
 319         for(i=0; i<buf_size; i++){
 320             state= (state<<8) | buf[i];
 321             if(state == 0x1B6){
 322                 i++;
 323                 vop_found=1;
 324                 break;
 325             }
 326         }
 327     }
 328
 329     if(vop_found){
 330         /* EOF considered as end of frame */
 331         if (buf_size == 0)
 332             return 0;
 333         for(; i<buf_size; i++){
 334             state= (state<<8) | buf[i];
 335             if((state&0xFFFFFF00) == 0x100){
 336                 pc->frame_start_found=0;
 337                 pc->state=-1;
 338                 return i-3;
 339             }
 340         }
 341     }
 342     pc->frame_start_found= vop_found;
 343     pc->state= state;
 344     return END_NOT_FOUND;
 345 }
 346
 347 static int h263_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size){
 348     int vop_found, i;
 349     uint32_t state;
 350
 351     vop_found= pc->frame_start_found;
 352     state= pc->state;
 353
 354     i=0;
 355     if(!vop_found){
 356         for(i=0; i<buf_size; i++){
 357             state= (state<<8) | buf[i];
 358             if(state>>(32-22) == 0x20){
 359                 i++;
 360                 vop_found=1;
 361                 break;
 362             }
 363         }
 364     }
 365
 366     if(vop_found){
 367       for(; i<buf_size; i++){
 368         state= (state<<8) | buf[i];
 369         if(state>>(32-22) == 0x20){
 370             pc->frame_start_found=0;
 371             pc->state=-1;
 372             return i-3;
 373         }
 374       }
 375     }
 376     pc->frame_start_found= vop_found;
 377     pc->state= state;
 378
 379     return END_NOT_FOUND;
 380 }
 381
 382 static int h263_parse(AVCodecParserContext *s,
 383                            AVCodecContext *avctx,
 384                            uint8_t **poutbuf, int *poutbuf_size,
 385                            const uint8_t *buf, int buf_size)
 386 {
 387     ParseContext *pc = s->priv_data;
 388     int next;
 389
 390     next= h263_find_frame_end(pc, buf, buf_size);
 391
 392     if (ff_combine_frame(pc, next, (uint8_t **)&buf, &buf_size) < 0) {
 393         *poutbuf = NULL;
 394         *poutbuf_size = 0;
 395         return buf_size;
 396     }
 397
 398     *poutbuf = (uint8_t *)buf;
 399     *poutbuf_size = buf_size;
 400     return next;
 401 }
 402
 403 int ff_h263_decode_frame(AVCodecContext *avctx,
 404                              void *data, int *data_size,
 405                              uint8_t *buf, int buf_size)
 406 {
 407     MpegEncContext *s = avctx->priv_data;
 408     int ret;
 409     AVFrame *pict = data;
 410
 411 #ifdef PRINT_FRAME_TIME
 412 uint64_t time= rdtsc();
 413 #endif
 414 #ifdef DEBUG
 415     printf("*****frame %d size=%d\n", avctx->frame_number, buf_size);
 416     printf("bytes=%x %x %x %x\n", buf[0], buf[1], buf[2], buf[3]);
 417 #endif
 418     s->flags= avctx->flags;
 419     s->flags2= avctx->flags2;
 420
 421     /* no supplementary picture */
 422     if (buf_size == 0) {
 423         /* special case for last picture */
 424         if (s->low_delay==0 && s->next_picture_ptr) {
 425             *pict= *(AVFrame*)s->next_picture_ptr;
 426             s->next_picture_ptr= NULL;
 427
 428             *data_size = sizeof(AVFrame);
 429         }
 430
 431         return 0;
 432     }
 433
 434     if(s->flags&CODEC_FLAG_TRUNCATED){
 435         int next;
 436
 437         if(s->codec_id==CODEC_ID_MPEG4){
 438             next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
 439         }else if(s->codec_id==CODEC_ID_H263){
 440             next= h263_find_frame_end(&s->parse_context, buf, buf_size);
 441         }else{
 442             av_log(s->avctx, AV_LOG_ERROR, "this codec doesnt support truncated bitstreams\n");
 443             return -1;
 444         }
 445
 446         if( ff_combine_frame(&s->parse_context, next, &buf, &buf_size) < 0 )
 447             return buf_size;
 448     }
 449
 450
 451 retry:
 452
 453     if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
 454         init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
 455     }else
 456         init_get_bits(&s->gb, buf, buf_size*8);
 457     s->bitstream_buffer_size=0;
 458
 459     if (!s->context_initialized) {
 460         if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
 461             return -1;
 462     }
 463
 464     //we need to set current_picture_ptr before reading the header, otherwise we cant store anyting im there
 465     if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){
 466         int i= ff_find_unused_picture(s, 0);
 467         s->current_picture_ptr= &s->picture[i];
 468     }
 469
 470     /* let's go :-) */
 471     if (s->msmpeg4_version==5) {
 472         ret= ff_wmv2_decode_picture_header(s);
 473     } else if (s->msmpeg4_version) {
 474         ret = msmpeg4_decode_picture_header(s);
 475     } else if (s->h263_pred) {
 476         if(s->avctx->extradata_size && s->picture_number==0){
 477             GetBitContext gb;
 478
 479             init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
 480             ret = ff_mpeg4_decode_picture_header(s, &gb);
 481         }
 482         ret = ff_mpeg4_decode_picture_header(s, &s->gb);
 483
 484         if(s->flags& CODEC_FLAG_LOW_DELAY)
 485             s->low_delay=1;
 486     } else if (s->codec_id == CODEC_ID_H263I) {
 487         ret = intel_h263_decode_picture_header(s);
 488     } else if (s->h263_flv) {
 489         ret = flv_h263_decode_picture_header(s);
 490     } else {
 491         ret = h263_decode_picture_header(s);
 492     }
 493
 494     if(ret==FRAME_SKIPED) return get_consumed_bytes(s, buf_size);
 495
 496     /* skip if the header was thrashed */
 497     if (ret < 0){
 498         av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
 499         return -1;
 500     }
 501
 502     avctx->has_b_frames= !s->low_delay;
 503
 504     if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
 505         if(s->avctx->stream_codec_tag == ff_get_fourcc("XVID") ||
 506            s->avctx->codec_tag == ff_get_fourcc("XVID") || s->avctx->codec_tag == ff_get_fourcc("XVIX"))
 507             s->xvid_build= -1;
 508 #if 0
 509         if(s->avctx->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
 510            && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
 511             s->xvid_build= -1;
 512 #endif
 513     }
 514
 515     if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
 516         if(s->avctx->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
 517             s->divx_version= 400; //divx 4
 518     }
 519
 520     if(s->workaround_bugs&FF_BUG_AUTODETECT){
 521         s->workaround_bugs &= ~FF_BUG_NO_PADDING;
 522
 523         if(s->padding_bug_score > -2 && !s->data_partitioning && (s->divx_version || !s->resync_marker))
 524             s->workaround_bugs |=  FF_BUG_NO_PADDING;
 525
 526         if(s->avctx->codec_tag == ff_get_fourcc("XVIX"))
 527             s->workaround_bugs|= FF_BUG_XVID_ILACE;
 528
 529         if(s->avctx->codec_tag == ff_get_fourcc("UMP4")){
 530             s->workaround_bugs|= FF_BUG_UMP4;
 531         }
 532
 533         if(s->divx_version>=500){
 534             s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
 535         }
 536
 537         if(s->divx_version>502){
 538             s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
 539         }
 540
 541         if(s->xvid_build && s->xvid_build<=3)
 542             s->padding_bug_score= 256*256*256*64;
 543
 544         if(s->xvid_build && s->xvid_build<=1)
 545             s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
 546
 547         if(s->xvid_build && s->xvid_build<=12)
 548             s->workaround_bugs|= FF_BUG_EDGE;
 549
 550         if(s->xvid_build && s->xvid_build<=32)
 551             s->workaround_bugs|= FF_BUG_DC_CLIP;
 552
 553 #define SET_QPEL_FUNC(postfix1, postfix2) \
 554     s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
 555     s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
 556     s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
 557
 558         if(s->lavc_build && s->lavc_build<4653)
 559             s->workaround_bugs|= FF_BUG_STD_QPEL;
 560
 561         if(s->lavc_build && s->lavc_build<4655)
 562             s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
 563
 564         if(s->lavc_build && s->lavc_build<4670){
 565             s->workaround_bugs|= FF_BUG_EDGE;
 566         }
 567
 568         if(s->lavc_build && s->lavc_build<=4712)
 569             s->workaround_bugs|= FF_BUG_DC_CLIP;
 570
 571         if(s->divx_version)
 572             s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
 573 //printf("padding_bug_score: %d\n", s->padding_bug_score);
 574         if(s->divx_version==501 && s->divx_build==20020416)
 575             s->padding_bug_score= 256*256*256*64;
 576
 577         if(s->divx_version && s->divx_version<500){
 578             s->workaround_bugs|= FF_BUG_EDGE;
 579         }
 580
 581         if(s->divx_version)
 582             s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
 583 #if 0
 584         if(s->divx_version==500)
 585             s->padding_bug_score= 256*256*256*64;
 586
 587         /* very ugly XVID padding bug detection FIXME/XXX solve this differently
 588          * lets hope this at least works
 589          */
 590         if(   s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==0
 591            && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
 592             s->workaround_bugs|= FF_BUG_NO_PADDING;
 593
 594         if(s->lavc_build && s->lavc_build<4609) //FIXME not sure about the version num but a 4609 file seems ok
 595             s->workaround_bugs|= FF_BUG_NO_PADDING;
 596 #endif
 597     }
 598
 599     if(s->workaround_bugs& FF_BUG_STD_QPEL){
 600         SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
 601         SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
 602         SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
 603         SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
 604         SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
 605         SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
 606
 607         SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
 608         SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
 609         SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
 610         SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
 611         SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
 612         SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
 613     }
 614
 615     if(avctx->debug & FF_DEBUG_BUGS)
 616         av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
 617                s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
 618                s->divx_packed ? "p" : "");
 619
 620 #if 0 // dump bits per frame / qp / complexity
 621 {
 622     static FILE *f=NULL;
 623     if(!f) f=fopen("rate_qp_cplx.txt", "w");
 624     fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
 625 }
 626 #endif
 627
 628 #ifdef HAVE_MMX
 629     if(s->codec_id == CODEC_ID_MPEG4 && s->xvid_build && avctx->idct_algo == FF_IDCT_AUTO && (mm_flags & MM_MMX) && !(s->flags&CODEC_FLAG_BITEXACT)){
 630         avctx->idct_algo= FF_IDCT_LIBMPEG2MMX;
 631         avctx->coded_width= 0; // force reinit
 632     }
 633 #endif
 634
 635         /* After H263 & mpeg4 header decode we have the height, width,*/
 636         /* and other parameters. So then we could init the picture   */
 637         /* FIXME: By the way H263 decoder is evolving it should have */
 638         /* an H263EncContext                                         */
 639
 640     if (   s->width  != avctx->coded_width
 641         || s->height != avctx->coded_height) {
 642         /* H.263 could change picture size any time */
 643         ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
 644         s->parse_context.buffer=0;
 645         MPV_common_end(s);
 646         s->parse_context= pc;
 647     }
 648     if (!s->context_initialized) {
 649         avcodec_set_dimensions(avctx, s->width, s->height);
 650
 651         goto retry;
 652     }
 653
 654     if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P))
 655         s->gob_index = ff_h263_get_gob_height(s);
 656
 657     // for hurry_up==5
 658     s->current_picture.pict_type= s->pict_type;
 659     s->current_picture.key_frame= s->pict_type == I_TYPE;
 660
 661     /* skip b frames if we dont have reference frames */
 662     if(s->last_picture_ptr==NULL && (s->pict_type==B_TYPE || s->dropable)) return get_consumed_bytes(s, buf_size);
 663     /* skip b frames if we are in a hurry */
 664     if(avctx->hurry_up && s->pict_type==B_TYPE) return get_consumed_bytes(s, buf_size);
 665     /* skip everything if we are in a hurry>=5 */
 666     if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
 667
 668     if(s->next_p_frame_damaged){
 669         if(s->pict_type==B_TYPE)
 670             return get_consumed_bytes(s, buf_size);
 671         else
 672             s->next_p_frame_damaged=0;
 673     }
 674
 675     if(MPV_frame_start(s, avctx) < 0)
 676         return -1;
 677
 678 #ifdef DEBUG
 679     printf("qscale=%d\n", s->qscale);
 680 #endif
 681
 682     ff_er_frame_start(s);
 683
 684     //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
 685     //which isnt available before MPV_frame_start()
 686     if (s->msmpeg4_version==5){
 687         if(ff_wmv2_decode_secondary_picture_header(s) < 0)
 688             return -1;
 689     }
 690
 691     /* decode each macroblock */
 692     s->mb_x=0;
 693     s->mb_y=0;
 694
 695     decode_slice(s);
 696     while(s->mb_y<s->mb_height){
 697         if(s->msmpeg4_version){
 698             if(s->mb_x!=0 || (s->mb_y%s->slice_height)!=0 || get_bits_count(&s->gb) > s->gb.size_in_bits)
 699                 break;
 700         }else{
 701             if(ff_h263_resync(s)<0)
 702                 break;
 703         }
 704
 705         if(s->msmpeg4_version<4 && s->h263_pred)
 706             ff_mpeg4_clean_buffers(s);
 707
 708         decode_slice(s);
 709     }
 710
 711     if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==I_TYPE)
 712         if(msmpeg4_decode_ext_header(s, buf_size) < 0){
 713             s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
 714         }
 715
 716     /* divx 5.01+ bistream reorder stuff */
 717     if(s->codec_id==CODEC_ID_MPEG4 && s->bitstream_buffer_size==0 && s->divx_packed){
 718         int current_pos= get_bits_count(&s->gb)>>3;
 719         int startcode_found=0;
 720
 721         if(   buf_size - current_pos > 5
 722            && buf_size - current_pos < BITSTREAM_BUFFER_SIZE){
 723             int i;
 724             for(i=current_pos; i<buf_size-3; i++){
 725                 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
 726                     startcode_found=1;
 727                     break;
 728                 }
 729             }
 730         }
 731         if(s->gb.buffer == s->bitstream_buffer && buf_size>20){ //xvid style
 732             startcode_found=1;
 733             current_pos=0;
 734         }
 735
 736         if(startcode_found){
 737             memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
 738             s->bitstream_buffer_size= buf_size - current_pos;
 739         }
 740     }
 741
 742     ff_er_frame_end(s);
 743
 744     MPV_frame_end(s);
 745
 746 assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);
 747 assert(s->current_picture.pict_type == s->pict_type);
 748     if(s->pict_type==B_TYPE || s->low_delay){
 749         *pict= *(AVFrame*)&s->current_picture;
 750         ff_print_debug_info(s, pict);
 751     } else {
 752         *pict= *(AVFrame*)&s->last_picture;
 753         if(pict)
 754             ff_print_debug_info(s, pict);
 755     }
 756
 757     /* Return the Picture timestamp as the frame number */
 758     /* we substract 1 because it is added on utils.c    */
 759     avctx->frame_number = s->picture_number - 1;
 760
 761     /* dont output the last pic after seeking */
 762     if(s->last_picture_ptr || s->low_delay)
 763         *data_size = sizeof(AVFrame);
 764 #ifdef PRINT_FRAME_TIME
 765 printf("%Ld\n", rdtsc()-time);
 766 #endif
 767
 768     return get_consumed_bytes(s, buf_size);
 769 }
 770
 771 static const AVOption mpeg4_decoptions[] =
 772 {
 773     AVOPTION_SUB(avoptions_workaround_bug),
 774     AVOPTION_END()
 775 };
 776
 777 AVCodec mpeg4_decoder = {
 778     "mpeg4",
 779     CODEC_TYPE_VIDEO,
 780     CODEC_ID_MPEG4,
 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 | CODEC_CAP_TRUNCATED,
 787     .options = mpeg4_decoptions,
 788     .flush= ff_mpeg_flush,
 789 };
 790
 791 AVCodec h263_decoder = {
 792     "h263",
 793     CODEC_TYPE_VIDEO,
 794     CODEC_ID_H263,
 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,
 801     .flush= ff_mpeg_flush,
 802 };
 803
 804 AVCodec msmpeg4v1_decoder = {
 805     "msmpeg4v1",
 806     CODEC_TYPE_VIDEO,
 807     CODEC_ID_MSMPEG4V1,
 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,
 814     mpeg4_decoptions,
 815 };
 816
 817 AVCodec msmpeg4v2_decoder = {
 818     "msmpeg4v2",
 819     CODEC_TYPE_VIDEO,
 820     CODEC_ID_MSMPEG4V2,
 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     mpeg4_decoptions,
 828 };
 829
 830 AVCodec msmpeg4v3_decoder = {
 831     "msmpeg4",
 832     CODEC_TYPE_VIDEO,
 833     CODEC_ID_MSMPEG4V3,
 834     sizeof(MpegEncContext),
 835     ff_h263_decode_init,
 836     NULL,
 837     ff_h263_decode_end,
 838     ff_h263_decode_frame,
 839     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 840     .options = mpeg4_decoptions,
 841 };
 842
 843 AVCodec wmv1_decoder = {
 844     "wmv1",
 845     CODEC_TYPE_VIDEO,
 846     CODEC_ID_WMV1,
 847     sizeof(MpegEncContext),
 848     ff_h263_decode_init,
 849     NULL,
 850     ff_h263_decode_end,
 851     ff_h263_decode_frame,
 852     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 853     mpeg4_decoptions,
 854 };
 855
 856 AVCodec h263i_decoder = {
 857     "h263i",
 858     CODEC_TYPE_VIDEO,
 859     CODEC_ID_H263I,
 860     sizeof(MpegEncContext),
 861     ff_h263_decode_init,
 862     NULL,
 863     ff_h263_decode_end,
 864     ff_h263_decode_frame,
 865     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 866     mpeg4_decoptions,
 867 };
 868
 869 AVCodec flv_decoder = {
 870     "flv",
 871     CODEC_TYPE_VIDEO,
 872     CODEC_ID_FLV1,
 873     sizeof(MpegEncContext),
 874     ff_h263_decode_init,
 875     NULL,
 876     ff_h263_decode_end,
 877     ff_h263_decode_frame,
 878     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1
 879 };
 880
 881 AVCodecParser h263_parser = {
 882     { CODEC_ID_H263 },
 883     sizeof(ParseContext),
 884     NULL,
 885     h263_parse,
 886     ff_parse_close,
 887 };