git.sesse.net Git - ffmpeg/blob - 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 #ifdef PRINT_FRAME_TIME
  32 static inline long long rdtsc()
  33 {
  34         long long l;
  35         asm volatile(   "rdtsc\n\t"
  36                 : "=A" (l)
  37         );
  38 //      printf("%d\n", int(l/1000));
  39         return l;
  40 }
  41 #endif
  42
  43 int ff_h263_decode_init(AVCodecContext *avctx)
  44 {
  45     MpegEncContext *s = avctx->priv_data;
  46
  47     s->avctx = avctx;
  48     s->out_format = FMT_H263;
  49
  50     s->width = avctx->width;
  51     s->height = avctx->height;
  52     s->workaround_bugs= avctx->workaround_bugs;
  53
  54     // set defaults
  55     s->quant_precision=5;
  56     s->progressive_sequence=1;
  57     s->decode_mb= ff_h263_decode_mb;
  58     s->low_delay= 1;
  59     avctx->pix_fmt= PIX_FMT_YUV420P;
  60
  61     /* select sub codec */
  62     switch(avctx->codec->id) {
  63     case CODEC_ID_H263:
  64         s->gob_number = 0;
  65         break;
  66     case CODEC_ID_MPEG4:
  67         s->time_increment_bits = 4; /* default value for broken headers */
  68         s->h263_pred = 1;
  69         s->low_delay = 0; //default, might be overriden in the vol header during header parsing
  70         break;
  71     case CODEC_ID_MSMPEG4V1:
  72         s->h263_msmpeg4 = 1;
  73         s->h263_pred = 1;
  74         s->msmpeg4_version=1;
  75         break;
  76     case CODEC_ID_MSMPEG4V2:
  77         s->h263_msmpeg4 = 1;
  78         s->h263_pred = 1;
  79         s->msmpeg4_version=2;
  80         break;
  81     case CODEC_ID_MSMPEG4V3:
  82         s->h263_msmpeg4 = 1;
  83         s->h263_pred = 1;
  84         s->msmpeg4_version=3;
  85         break;
  86     case CODEC_ID_WMV1:
  87         s->h263_msmpeg4 = 1;
  88         s->h263_pred = 1;
  89         s->msmpeg4_version=4;
  90         break;
  91     case CODEC_ID_WMV2:
  92         s->h263_msmpeg4 = 1;
  93         s->h263_pred = 1;
  94         s->msmpeg4_version=5;
  95         break;
  96     case CODEC_ID_H263I:
  97         s->h263_intel = 1;
  98         break;
  99     default:
 100         return -1;
 101     }
 102     s->codec_id= avctx->codec->id;
 103
 104     /* for h263, we allocate the images after having read the header */
 105     if (avctx->codec->id != CODEC_ID_H263 && avctx->codec->id != CODEC_ID_MPEG4)
 106         if (MPV_common_init(s) < 0)
 107             return -1;
 108
 109     if (s->h263_msmpeg4)
 110         ff_msmpeg4_decode_init(s);
 111     else
 112         h263_decode_init_vlc(s);
 113
 114     return 0;
 115 }
 116
 117 int ff_h263_decode_end(AVCodecContext *avctx)
 118 {
 119     MpegEncContext *s = avctx->priv_data;
 120
 121     MPV_common_end(s);
 122     return 0;
 123 }
 124
 125 /**
 126  * retunrs the number of bytes consumed for building the current frame
 127  */
 128 static int get_consumed_bytes(MpegEncContext *s, int buf_size){
 129     int pos= (get_bits_count(&s->gb)+7)>>3;
 130
 131     if(s->divx_packed){
 132         //we would have to scan through the whole buf to handle the weird reordering ...
 133         return buf_size;
 134     }else if(s->flags&CODEC_FLAG_TRUNCATED){
 135         pos -= s->parse_context.last_index;
 136         if(pos<0) pos=0; // padding is not really read so this might be -1
 137         return pos;
 138     }else{
 139         if(pos==0) pos=1; //avoid infinite loops (i doubt thats needed but ...)
 140         if(pos+10>buf_size) pos=buf_size; // oops ;)
 141
 142         return pos;
 143     }
 144 }
 145
 146 static int decode_slice(MpegEncContext *s){
 147     const int part_mask= s->partitioned_frame ? (AC_END|AC_ERROR) : 0x7F;
 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     s->y_dc_scale= s->y_dc_scale_table[ s->qscale ];
 155     s->c_dc_scale= s->c_dc_scale_table[ s->qscale ];
 156
 157     if(s->partitioned_frame){
 158         const int qscale= s->qscale;
 159
 160         if(s->codec_id==CODEC_ID_MPEG4){
 161             if(ff_mpeg4_decode_partitions(s) < 0)
 162                 return -1;
 163         }
 164
 165         /* restore variables which where modified */
 166         s->first_slice_line=1;
 167         s->mb_x= s->resync_mb_x;
 168         s->mb_y= s->resync_mb_y;
 169         s->qscale= qscale;
 170         s->y_dc_scale= s->y_dc_scale_table[ s->qscale ];
 171         s->c_dc_scale= s->c_dc_scale_table[ s->qscale ];
 172     }
 173
 174     for(; s->mb_y < s->mb_height; s->mb_y++) {
 175         /* per-row end of slice checks */
 176         if(s->msmpeg4_version){
 177             if(s->resync_mb_y + s->slice_height == s->mb_y){
 178                 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);
 179
 180                 return 0;
 181             }
 182         }
 183
 184         if(s->msmpeg4_version==1){
 185             s->last_dc[0]=
 186             s->last_dc[1]=
 187             s->last_dc[2]= 128;
 188         }
 189
 190         ff_init_block_index(s);
 191         for(; s->mb_x < s->mb_width; s->mb_x++) {
 192             int ret;
 193
 194             ff_update_block_index(s);
 195
 196             if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
 197                 s->first_slice_line=0;
 198             }
 199
 200             /* DCT & quantize */
 201             s->dsp.clear_blocks(s->block[0]);
 202
 203             s->mv_dir = MV_DIR_FORWARD;
 204             s->mv_type = MV_TYPE_16X16;
 205 //            s->mb_skiped = 0;
 206 //printf("%d %d %06X\n", ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
 207             ret= s->decode_mb(s, s->block);
 208
 209             MPV_decode_mb(s, s->block);
 210
 211             if(ret<0){
 212                 const int xy= s->mb_x + s->mb_y*s->mb_width;
 213                 if(ret==SLICE_END){
 214 //printf("%d %d %d %06X\n", s->mb_x, s->mb_y, s->gb.size*8 - get_bits_count(&s->gb), show_bits(&s->gb, 24));
 215                     ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, (AC_END|DC_END|MV_END)&part_mask);
 216
 217                     s->padding_bug_score--;
 218
 219                     if(++s->mb_x >= s->mb_width){
 220                         s->mb_x=0;
 221                         ff_draw_horiz_band(s, s->mb_y*16, 16);
 222                         s->mb_y++;
 223                     }
 224                     return 0;
 225                 }else if(ret==SLICE_NOEND){
 226                     fprintf(stderr,"Slice mismatch at MB: %d\n", xy);
 227                     ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x+1, s->mb_y, (AC_END|DC_END|MV_END)&part_mask);
 228                     return -1;
 229                 }
 230                 fprintf(stderr,"Error at MB: %d\n", xy);
 231                 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, (AC_ERROR|DC_ERROR|MV_ERROR)&part_mask);
 232
 233                 return -1;
 234             }
 235         }
 236
 237         ff_draw_horiz_band(s, s->mb_y*16, 16);
 238
 239         s->mb_x= 0;
 240     }
 241
 242     assert(s->mb_x==0 && s->mb_y==s->mb_height);
 243
 244     /* try to detect the padding bug */
 245     if(      s->codec_id==CODEC_ID_MPEG4
 246        &&   (s->workaround_bugs&FF_BUG_AUTODETECT)
 247        &&    s->gb.size_in_bits - get_bits_count(&s->gb) >=0
 248        &&    s->gb.size_in_bits - get_bits_count(&s->gb) < 48
 249 //       &&   !s->resync_marker
 250        &&   !s->data_partitioning){
 251
 252         const int bits_count= get_bits_count(&s->gb);
 253         const int bits_left = s->gb.size_in_bits - bits_count;
 254
 255         if(bits_left==0){
 256             s->padding_bug_score+=16;
 257         }else if(bits_left>8){
 258             s->padding_bug_score++;
 259         } else if(bits_left != 1){
 260             int v= show_bits(&s->gb, 8);
 261             v|= 0x7F >> (7-(bits_count&7));
 262
 263             if(v==0x7F)
 264                 s->padding_bug_score--;
 265             else
 266                 s->padding_bug_score++;
 267         }
 268     }
 269
 270     // handle formats which dont have unique end markers
 271     if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
 272         int left= s->gb.size_in_bits - get_bits_count(&s->gb);
 273         int max_extra=7;
 274
 275         /* no markers in M$ crap */
 276         if(s->msmpeg4_version && s->pict_type==I_TYPE)
 277             max_extra+= 17;
 278
 279         /* buggy padding but the frame should still end approximately at the bitstream end */
 280         if((s->workaround_bugs&FF_BUG_NO_PADDING) && s->error_resilience>=3)
 281             max_extra+= 48;
 282         else if((s->workaround_bugs&FF_BUG_NO_PADDING))
 283             max_extra+= 256*256*256*64;
 284
 285         if(left>max_extra){
 286             fprintf(stderr, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
 287         }
 288         else if(left<0){
 289             fprintf(stderr, "overreading %d bits\n", -left);
 290         }else
 291             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);
 292
 293         return 0;
 294     }
 295
 296     fprintf(stderr, "slice end not reached but screenspace end (%d left %06X)\n",
 297             s->gb.size_in_bits - get_bits_count(&s->gb),
 298             show_bits(&s->gb, 24));
 299
 300     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);
 301
 302     return -1;
 303 }
 304
 305 /**
 306  * finds the end of the current frame in the bitstream.
 307  * @return the position of the first byte of the next frame, or -1
 308  */
 309 static int mpeg4_find_frame_end(MpegEncContext *s, uint8_t *buf, int buf_size){
 310     ParseContext *pc= &s->parse_context;
 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     for(; i<buf_size; i++){
 330         state= (state<<8) | buf[i];
 331         if((state&0xFFFFFF00) == 0x100){
 332             pc->frame_start_found=0;
 333             pc->state=-1;
 334             return i-3;
 335         }
 336     }
 337     pc->frame_start_found= vop_found;
 338     pc->state= state;
 339     return -1;
 340 }
 341
 342 /**
 343  * draws an line from (ex, ey) -> (sx, sy).
 344  * @param w width of the image
 345  * @param h height of the image
 346  * @param stride stride/linesize of the image
 347  * @param color color of the arrow
 348  */
 349 static void draw_line(uint8_t *buf, int sx, int sy, int ex, int ey, int w, int h, int stride, int color){
 350     int t, x, y, f;
 351
 352     ex= clip(ex, 0, w-1);
 353     ey= clip(ey, 0, h-1);
 354
 355     buf[sy*stride + sx]+= color;
 356
 357     if(ABS(ex - sx) > ABS(ey - sy)){
 358         if(sx > ex){
 359             t=sx; sx=ex; ex=t;
 360             t=sy; sy=ey; ey=t;
 361         }
 362         buf+= sx + sy*stride;
 363         ex-= sx;
 364         f= ((ey-sy)<<16)/ex;
 365         for(x= 0; x <= ex; x++){
 366             y= ((x*f) + (1<<15))>>16;
 367             buf[y*stride + x]+= color;
 368         }
 369     }else{
 370         if(sy > ey){
 371             t=sx; sx=ex; ex=t;
 372             t=sy; sy=ey; ey=t;
 373         }
 374         buf+= sx + sy*stride;
 375         ey-= sy;
 376         if(ey) f= ((ex-sx)<<16)/ey;
 377         else   f= 0;
 378         for(y= 0; y <= ey; y++){
 379             x= ((y*f) + (1<<15))>>16;
 380             buf[y*stride + x]+= color;
 381         }
 382     }
 383 }
 384
 385 /**
 386  * draws an arrow from (ex, ey) -> (sx, sy).
 387  * @param w width of the image
 388  * @param h height of the image
 389  * @param stride stride/linesize of the image
 390  * @param color color of the arrow
 391  */
 392 static void draw_arrow(uint8_t *buf, int sx, int sy, int ex, int ey, int w, int h, int stride, int color){
 393     int dx= ex - sx;
 394     int dy= ey - sy;
 395
 396     if(dx*dx + dy*dy > 3*3){
 397         int rx=  dx + dy;
 398         int ry= -dx + dy;
 399         int length= ff_sqrt((rx*rx + ry*ry)<<8);
 400
 401         //FIXME subpixel accuracy
 402         rx= ROUNDED_DIV(rx*3<<4, length);
 403         ry= ROUNDED_DIV(ry*3<<4, length);
 404
 405         draw_line(buf, sx, sy, sx + rx, sy + ry, w, h, stride, color);
 406         draw_line(buf, sx, sy, sx - ry, sy + rx, w, h, stride, color);
 407     }
 408     draw_line(buf, sx, sy, ex, ey, w, h, stride, color);
 409 }
 410
 411 int ff_h263_decode_frame(AVCodecContext *avctx,
 412                              void *data, int *data_size,
 413                              uint8_t *buf, int buf_size)
 414 {
 415     MpegEncContext *s = avctx->priv_data;
 416     int ret,i;
 417     AVFrame *pict = data;
 418     float new_aspect;
 419
 420 #ifdef PRINT_FRAME_TIME
 421 uint64_t time= rdtsc();
 422 #endif
 423 #ifdef DEBUG
 424     printf("*****frame %d size=%d\n", avctx->frame_number, buf_size);
 425     printf("bytes=%x %x %x %x\n", buf[0], buf[1], buf[2], buf[3]);
 426 #endif
 427     s->flags= avctx->flags;
 428
 429     *data_size = 0;
 430
 431    /* no supplementary picture */
 432     if (buf_size == 0) {
 433         return 0;
 434     }
 435
 436     if(s->flags&CODEC_FLAG_TRUNCATED){
 437         int next;
 438
 439         if(s->codec_id==CODEC_ID_MPEG4){
 440             next= mpeg4_find_frame_end(s, buf, buf_size);
 441         }else{
 442             fprintf(stderr, "this codec doesnt support truncated bitstreams\n");
 443             return -1;
 444         }
 445
 446         if( ff_combine_frame(s, next, &buf, &buf_size) < 0 )
 447             return buf_size;
 448     }
 449
 450 retry:
 451
 452     if(s->bitstream_buffer_size && buf_size<20){ //divx 5.01+ frame reorder
 453         init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
 454     }else
 455         init_get_bits(&s->gb, buf, buf_size*8);
 456     s->bitstream_buffer_size=0;
 457
 458     if (!s->context_initialized) {
 459         if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
 460             return -1;
 461     }
 462
 463     /* let's go :-) */
 464     if (s->msmpeg4_version==5) {
 465         ret= ff_wmv2_decode_picture_header(s);
 466     } else if (s->msmpeg4_version) {
 467         ret = msmpeg4_decode_picture_header(s);
 468     } else if (s->h263_pred) {
 469         if(s->avctx->extradata_size && s->picture_number==0){
 470             GetBitContext gb;
 471
 472             init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
 473             ret = ff_mpeg4_decode_picture_header(s, &gb);
 474         }
 475         ret = ff_mpeg4_decode_picture_header(s, &s->gb);
 476
 477         if(s->flags& CODEC_FLAG_LOW_DELAY)
 478             s->low_delay=1;
 479     } else if (s->h263_intel) {
 480         ret = intel_h263_decode_picture_header(s);
 481     } else {
 482         ret = h263_decode_picture_header(s);
 483     }
 484     avctx->has_b_frames= !s->low_delay;
 485
 486     if(s->workaround_bugs&FF_BUG_AUTODETECT){
 487         if(s->padding_bug_score > -2 && !s->data_partitioning && !s->resync_marker)
 488             s->workaround_bugs |=  FF_BUG_NO_PADDING;
 489         else
 490             s->workaround_bugs &= ~FF_BUG_NO_PADDING;
 491
 492         if(s->avctx->codec_tag == ff_get_fourcc("XVIX"))
 493             s->workaround_bugs|= FF_BUG_XVID_ILACE;
 494 #if 0
 495         if(s->avctx->codec_tag == ff_get_fourcc("MP4S"))
 496             s->workaround_bugs|= FF_BUG_AC_VLC;
 497
 498         if(s->avctx->codec_tag == ff_get_fourcc("M4S2"))
 499             s->workaround_bugs|= FF_BUG_AC_VLC;
 500 #endif
 501         if(s->avctx->codec_tag == ff_get_fourcc("UMP4")){
 502             s->workaround_bugs|= FF_BUG_UMP4;
 503             s->workaround_bugs|= FF_BUG_AC_VLC;
 504         }
 505
 506         if(s->divx_version){
 507             s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
 508         }
 509
 510         if(s->divx_version>502){
 511             s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
 512         }
 513
 514         if(s->avctx->codec_tag == ff_get_fourcc("XVID") && s->xvid_build==0)
 515             s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
 516
 517         if(s->avctx->codec_tag == ff_get_fourcc("XVID") && s->xvid_build==0)
 518             s->padding_bug_score= 256*256*256*64;
 519
 520         if(s->xvid_build && s->xvid_build<=3)
 521             s->padding_bug_score= 256*256*256*64;
 522
 523         if(s->xvid_build && s->xvid_build<=1)
 524             s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
 525
 526 #define SET_QPEL_FUNC(postfix1, postfix2) \
 527     s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
 528     s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
 529     s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
 530
 531         if(s->lavc_build && s->lavc_build<4653)
 532             s->workaround_bugs|= FF_BUG_STD_QPEL;
 533
 534         if(s->lavc_build && s->lavc_build<4655)
 535             s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
 536
 537         if(s->divx_version)
 538             s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
 539 //printf("padding_bug_score: %d\n", s->padding_bug_score);
 540         if(s->divx_version==501 && s->divx_build==20020416)
 541             s->padding_bug_score= 256*256*256*64;
 542
 543         if(s->divx_version>=500){
 544             s->workaround_bugs|= FF_BUG_EDGE;
 545         }
 546
 547 #if 0
 548         if(s->divx_version==500)
 549             s->padding_bug_score= 256*256*256*64;
 550
 551         /* very ugly XVID padding bug detection FIXME/XXX solve this differently
 552          * lets hope this at least works
 553          */
 554         if(   s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==0
 555            && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
 556             s->workaround_bugs|= FF_BUG_NO_PADDING;
 557
 558         if(s->lavc_build && s->lavc_build<4609) //FIXME not sure about the version num but a 4609 file seems ok
 559             s->workaround_bugs|= FF_BUG_NO_PADDING;
 560 #endif
 561     }
 562
 563     if(s->workaround_bugs& FF_BUG_STD_QPEL){
 564         SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
 565         SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
 566         SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
 567         SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
 568         SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
 569         SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
 570
 571         SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
 572         SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
 573         SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
 574         SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
 575         SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
 576         SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
 577     }
 578
 579 #if 0 // dump bits per frame / qp / complexity
 580 {
 581     static FILE *f=NULL;
 582     if(!f) f=fopen("rate_qp_cplx.txt", "w");
 583     fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
 584 }
 585 #endif
 586
 587         /* After H263 & mpeg4 header decode we have the height, width,*/
 588         /* and other parameters. So then we could init the picture   */
 589         /* FIXME: By the way H263 decoder is evolving it should have */
 590         /* an H263EncContext                                         */
 591     if(s->aspected_height)
 592         new_aspect= s->aspected_width*s->width / (float)(s->height*s->aspected_height);
 593     else
 594         new_aspect=0;
 595
 596     if (   s->width != avctx->width || s->height != avctx->height
 597         || ABS(new_aspect - avctx->aspect_ratio) > 0.001) {
 598         /* H.263 could change picture size any time */
 599         MPV_common_end(s);
 600     }
 601     if (!s->context_initialized) {
 602         avctx->width = s->width;
 603         avctx->height = s->height;
 604         avctx->aspect_ratio= new_aspect;
 605
 606         goto retry;
 607     }
 608
 609     if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P))
 610         s->gob_index = ff_h263_get_gob_height(s);
 611
 612     if(ret==FRAME_SKIPED) return get_consumed_bytes(s, buf_size);
 613     /* skip if the header was thrashed */
 614     if (ret < 0){
 615         fprintf(stderr, "header damaged\n");
 616         return -1;
 617     }
 618
 619     // for hurry_up==5
 620     s->current_picture.pict_type= s->pict_type;
 621     s->current_picture.key_frame= s->pict_type == I_TYPE;
 622
 623     /* skip b frames if we dont have reference frames */
 624     if(s->last_picture_ptr==NULL && s->pict_type==B_TYPE) return get_consumed_bytes(s, buf_size);
 625     /* skip b frames if we are in a hurry */
 626     if(avctx->hurry_up && s->pict_type==B_TYPE) return get_consumed_bytes(s, buf_size);
 627     /* skip everything if we are in a hurry>=5 */
 628     if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
 629
 630     if(s->next_p_frame_damaged){
 631         if(s->pict_type==B_TYPE)
 632             return get_consumed_bytes(s, buf_size);
 633         else
 634             s->next_p_frame_damaged=0;
 635     }
 636
 637     if(MPV_frame_start(s, avctx) < 0)
 638         return -1;
 639
 640 #ifdef DEBUG
 641     printf("qscale=%d\n", s->qscale);
 642 #endif
 643
 644     ff_er_frame_start(s);
 645
 646     /* decode each macroblock */
 647     s->block_wrap[0]=
 648     s->block_wrap[1]=
 649     s->block_wrap[2]=
 650     s->block_wrap[3]= s->mb_width*2 + 2;
 651     s->block_wrap[4]=
 652     s->block_wrap[5]= s->mb_width + 2;
 653     s->mb_x=0;
 654     s->mb_y=0;
 655
 656     decode_slice(s);
 657     while(s->mb_y<s->mb_height && s->gb.size_in_bits - get_bits_count(&s->gb)>16){
 658         if(s->msmpeg4_version){
 659             if(s->mb_x!=0 || (s->mb_y%s->slice_height)!=0)
 660                 break;
 661         }else{
 662             if(ff_h263_resync(s)<0)
 663                 break;
 664         }
 665
 666         if(s->msmpeg4_version<4 && s->h263_pred)
 667             ff_mpeg4_clean_buffers(s);
 668
 669         decode_slice(s);
 670     }
 671
 672     if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==I_TYPE)
 673         if(msmpeg4_decode_ext_header(s, buf_size) < 0){
 674             s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
 675         }
 676
 677     /* divx 5.01+ bistream reorder stuff */
 678     if(s->codec_id==CODEC_ID_MPEG4 && s->bitstream_buffer_size==0 && s->divx_packed){
 679         int current_pos= get_bits_count(&s->gb)>>3;
 680
 681         if(   buf_size - current_pos > 5
 682            && buf_size - current_pos < BITSTREAM_BUFFER_SIZE){
 683             int i;
 684             int startcode_found=0;
 685             for(i=current_pos; i<buf_size-3; i++){
 686                 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
 687                     startcode_found=1;
 688                     break;
 689                 }
 690             }
 691             if(startcode_found){
 692                 memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
 693                 s->bitstream_buffer_size= buf_size - current_pos;
 694             }
 695         }
 696     }
 697
 698     ff_er_frame_end(s);
 699
 700     MPV_frame_end(s);
 701
 702     if((avctx->debug&FF_DEBUG_VIS_MV) && s->last_picture_ptr){
 703         const int shift= 1 + s->quarter_sample;
 704         int mb_y;
 705         uint8_t *ptr= s->last_picture.data[0];
 706         s->low_delay=0; //needed to see the vectors without trashing the buffers
 707
 708         for(mb_y=0; mb_y<s->mb_height; mb_y++){
 709             int mb_x;
 710             for(mb_x=0; mb_x<s->mb_width; mb_x++){
 711                 const int mb_index= mb_x + mb_y*s->mb_width;
 712                 if(s->co_located_type_table[mb_index] == MV_TYPE_8X8){
 713                     int i;
 714                     for(i=0; i<4; i++){
 715                         int sx= mb_x*16 + 4 + 8*(i&1);
 716                         int sy= mb_y*16 + 4 + 8*(i>>1);
 717                         int xy= 1 + mb_x*2 + (i&1) + (mb_y*2 + 1 + (i>>1))*(s->mb_width*2 + 2);
 718                         int mx= (s->motion_val[xy][0]>>shift) + sx;
 719                         int my= (s->motion_val[xy][1]>>shift) + sy;
 720                         draw_arrow(ptr, sx, sy, mx, my, s->width, s->height, s->linesize, 100);
 721                     }
 722                 }else{
 723                     int sx= mb_x*16 + 8;
 724                     int sy= mb_y*16 + 8;
 725                     int xy= 1 + mb_x*2 + (mb_y*2 + 1)*(s->mb_width*2 + 2);
 726                     int mx= (s->motion_val[xy][0]>>shift) + sx;
 727                     int my= (s->motion_val[xy][1]>>shift) + sy;
 728                     draw_arrow(ptr, sx, sy, mx, my, s->width, s->height, s->linesize, 100);
 729                 }
 730                 s->mbskip_table[mb_index]=0;
 731             }
 732         }
 733     }
 734
 735
 736     if(s->pict_type==B_TYPE || s->low_delay){
 737         *pict= *(AVFrame*)&s->current_picture;
 738     } else {
 739         *pict= *(AVFrame*)&s->last_picture;
 740     }
 741
 742     if(avctx->debug&FF_DEBUG_QP){
 743         int8_t *qtab= pict->qscale_table;
 744         int x,y;
 745
 746         for(y=0; y<s->mb_height; y++){
 747             for(x=0; x<s->mb_width; x++){
 748                 printf("%2d ", qtab[x + y*s->mb_width]);
 749             }
 750             printf("\n");
 751         }
 752         printf("\n");
 753     }
 754
 755     /* Return the Picture timestamp as the frame number */
 756     /* we substract 1 because it is added on utils.c    */
 757     avctx->frame_number = s->picture_number - 1;
 758
 759     /* dont output the last pic after seeking */
 760     if(s->last_picture_ptr || s->low_delay)
 761         *data_size = sizeof(AVFrame);
 762 #ifdef PRINT_FRAME_TIME
 763 printf("%Ld\n", rdtsc()-time);
 764 #endif
 765     return get_consumed_bytes(s, buf_size);
 766 }
 767
 768 static const AVOption mpeg4_decoptions[] =
 769 {
 770     AVOPTION_SUB(avoptions_workaround_bug),
 771     AVOPTION_END()
 772 };
 773
 774 AVCodec mpeg4_decoder = {
 775     "mpeg4",
 776     CODEC_TYPE_VIDEO,
 777     CODEC_ID_MPEG4,
 778     sizeof(MpegEncContext),
 779     ff_h263_decode_init,
 780     NULL,
 781     ff_h263_decode_end,
 782     ff_h263_decode_frame,
 783     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
 784     .options = mpeg4_decoptions,
 785 };
 786
 787 AVCodec h263_decoder = {
 788     "h263",
 789     CODEC_TYPE_VIDEO,
 790     CODEC_ID_H263,
 791     sizeof(MpegEncContext),
 792     ff_h263_decode_init,
 793     NULL,
 794     ff_h263_decode_end,
 795     ff_h263_decode_frame,
 796     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 797 };
 798
 799 AVCodec msmpeg4v1_decoder = {
 800     "msmpeg4v1",
 801     CODEC_TYPE_VIDEO,
 802     CODEC_ID_MSMPEG4V1,
 803     sizeof(MpegEncContext),
 804     ff_h263_decode_init,
 805     NULL,
 806     ff_h263_decode_end,
 807     ff_h263_decode_frame,
 808     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 809     mpeg4_decoptions,
 810 };
 811
 812 AVCodec msmpeg4v2_decoder = {
 813     "msmpeg4v2",
 814     CODEC_TYPE_VIDEO,
 815     CODEC_ID_MSMPEG4V2,
 816     sizeof(MpegEncContext),
 817     ff_h263_decode_init,
 818     NULL,
 819     ff_h263_decode_end,
 820     ff_h263_decode_frame,
 821     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 822     mpeg4_decoptions,
 823 };
 824
 825 AVCodec msmpeg4v3_decoder = {
 826     "msmpeg4",
 827     CODEC_TYPE_VIDEO,
 828     CODEC_ID_MSMPEG4V3,
 829     sizeof(MpegEncContext),
 830     ff_h263_decode_init,
 831     NULL,
 832     ff_h263_decode_end,
 833     ff_h263_decode_frame,
 834     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 835     .options = mpeg4_decoptions,
 836 };
 837
 838 AVCodec wmv1_decoder = {
 839     "wmv1",
 840     CODEC_TYPE_VIDEO,
 841     CODEC_ID_WMV1,
 842     sizeof(MpegEncContext),
 843     ff_h263_decode_init,
 844     NULL,
 845     ff_h263_decode_end,
 846     ff_h263_decode_frame,
 847     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 848     mpeg4_decoptions,
 849 };
 850
 851 AVCodec h263i_decoder = {
 852     "h263i",
 853     CODEC_TYPE_VIDEO,
 854     CODEC_ID_H263I,
 855     sizeof(MpegEncContext),
 856     ff_h263_decode_init,
 857     NULL,
 858     ff_h263_decode_end,
 859     ff_h263_decode_frame,
 860     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 861     mpeg4_decoptions,
 862 };
 863