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