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_version>=500){
 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     s->last_resync_gb= s->gb;
 148     s->first_slice_line= 1;
 149
 150     s->resync_mb_x= s->mb_x;
 151     s->resync_mb_y= s->mb_y;
 152
 153     s->y_dc_scale= s->y_dc_scale_table[ s->qscale ];
 154     s->c_dc_scale= s->c_dc_scale_table[ 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 where modified */
 165         s->first_slice_line=1;
 166         s->mb_x= s->resync_mb_x;
 167         s->mb_y= s->resync_mb_y;
 168         s->qscale= qscale;
 169         s->y_dc_scale= s->y_dc_scale_table[ s->qscale ];
 170         s->c_dc_scale= s->c_dc_scale_table[ s->qscale ];
 171     }
 172
 173     for(; s->mb_y < s->mb_height; s->mb_y++) {
 174         /* per-row end of slice checks */
 175         if(s->msmpeg4_version){
 176             if(s->resync_mb_y + s->slice_height == s->mb_y){
 177                 const int xy= s->mb_x + s->mb_y*s->mb_width;
 178                 s->error_status_table[xy-1]|= AC_END|DC_END|MV_END;
 179                 return 0;
 180             }
 181         }
 182
 183         if(s->msmpeg4_version==1){
 184             s->last_dc[0]=
 185             s->last_dc[1]=
 186             s->last_dc[2]= 128;
 187         }
 188
 189         ff_init_block_index(s);
 190         for(; s->mb_x < s->mb_width; s->mb_x++) {
 191             int ret;
 192
 193             ff_update_block_index(s);
 194
 195             if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
 196                 s->first_slice_line=0;
 197             }
 198
 199             /* DCT & quantize */
 200             s->dsp.clear_blocks(s->block[0]);
 201
 202             s->mv_dir = MV_DIR_FORWARD;
 203             s->mv_type = MV_TYPE_16X16;
 204 //            s->mb_skiped = 0;
 205 //printf("%d %d %06X\n", ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
 206             ret= s->decode_mb(s, s->block);
 207
 208             MPV_decode_mb(s, s->block);
 209
 210             if(ret<0){
 211                 const int xy= s->mb_x + s->mb_y*s->mb_width;
 212                 if(ret==SLICE_END){
 213 //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));
 214                     s->error_status_table[xy]|= AC_END;
 215                     if(!s->partitioned_frame)
 216                         s->error_status_table[xy]|= MV_END|DC_END;
 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*16, 16);
 223                         s->mb_y++;
 224                     }
 225                     return 0;
 226                 }else if(ret==SLICE_NOEND){
 227                     fprintf(stderr,"Slice mismatch at MB: %d\n", xy);
 228                     return -1;
 229                 }
 230                 fprintf(stderr,"Error at MB: %d\n", xy);
 231                 s->error_status_table[xy]|= AC_ERROR;
 232                 if(!s->partitioned_frame)
 233                     s->error_status_table[xy]|= DC_ERROR|MV_ERROR;
 234
 235                 return -1;
 236             }
 237         }
 238
 239         ff_draw_horiz_band(s, s->mb_y*16, 16);
 240
 241         s->mb_x= 0;
 242     }
 243
 244     assert(s->mb_x==0 && s->mb_y==s->mb_height);
 245
 246     /* try to detect the padding bug */
 247     if(      s->codec_id==CODEC_ID_MPEG4
 248        &&   (s->workaround_bugs&FF_BUG_AUTODETECT)
 249        &&    s->gb.size_in_bits - get_bits_count(&s->gb) >=0
 250        &&    s->gb.size_in_bits - get_bits_count(&s->gb) < 48
 251 //       &&   !s->resync_marker
 252        &&   !s->data_partitioning){
 253
 254         const int bits_count= get_bits_count(&s->gb);
 255         const int bits_left = s->gb.size_in_bits - bits_count;
 256
 257         if(bits_left==0){
 258             s->padding_bug_score+=16;
 259         }else if(bits_left>8){
 260             s->padding_bug_score++;
 261         } else if(bits_left != 1){
 262             int v= show_bits(&s->gb, 8);
 263             v|= 0x7F >> (7-(bits_count&7));
 264
 265             if(v==0x7F)
 266                 s->padding_bug_score--;
 267             else
 268                 s->padding_bug_score++;
 269         }
 270     }
 271
 272     // handle formats which dont have unique end markers
 273     if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
 274         int left= s->gb.size_in_bits - get_bits_count(&s->gb);
 275         int max_extra=7;
 276
 277         /* no markers in M$ crap */
 278         if(s->msmpeg4_version && s->pict_type==I_TYPE)
 279             max_extra+= 17;
 280
 281         /* buggy padding but the frame should still end approximately at the bitstream end */
 282         if((s->workaround_bugs&FF_BUG_NO_PADDING) && s->error_resilience>=3)
 283             max_extra+= 48;
 284         else if((s->workaround_bugs&FF_BUG_NO_PADDING))
 285             max_extra+= 256*256*256*64;
 286
 287         if(left>max_extra){
 288             fprintf(stderr, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
 289         }
 290         else if(left<0){
 291             fprintf(stderr, "overreading %d bits\n", -left);
 292         }else
 293             s->error_status_table[s->mb_num-1]|= AC_END|MV_END|DC_END;
 294
 295         return 0;
 296     }
 297
 298     fprintf(stderr, "slice end not reached but screenspace end (%d left %06X)\n",
 299             s->gb.size_in_bits - get_bits_count(&s->gb),
 300             show_bits(&s->gb, 24));
 301     return -1;
 302 }
 303
 304 /**
 305  * finds the end of the current frame in the bitstream.
 306  * @return the position of the first byte of the next frame, or -1
 307  */
 308 static int mpeg4_find_frame_end(MpegEncContext *s, uint8_t *buf, int buf_size){
 309     ParseContext *pc= &s->parse_context;
 310     int vop_found, i;
 311     uint32_t state;
 312
 313     vop_found= pc->frame_start_found;
 314     state= pc->state;
 315
 316     i=0;
 317     if(!vop_found){
 318         for(i=0; i<buf_size; i++){
 319             state= (state<<8) | buf[i];
 320             if(state == 0x1B6){
 321                 i++;
 322                 vop_found=1;
 323                 break;
 324             }
 325         }
 326     }
 327
 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     pc->frame_start_found= vop_found;
 337     pc->state= state;
 338     return -1;
 339 }
 340
 341 /**
 342  * draws an line from (ex, ey) -> (sx, sy).
 343  * @param w width of the image
 344  * @param h height of the image
 345  * @param stride stride/linesize of the image
 346  * @param color color of the arrow
 347  */
 348 static void draw_line(uint8_t *buf, int sx, int sy, int ex, int ey, int w, int h, int stride, int color){
 349     int t, x, y, f;
 350
 351     ex= clip(ex, 0, w-1);
 352     ey= clip(ey, 0, h-1);
 353
 354     buf[sy*stride + sx]+= color;
 355
 356     if(ABS(ex - sx) > ABS(ey - sy)){
 357         if(sx > ex){
 358             t=sx; sx=ex; ex=t;
 359             t=sy; sy=ey; ey=t;
 360         }
 361         buf+= sx + sy*stride;
 362         ex-= sx;
 363         f= ((ey-sy)<<16)/ex;
 364         for(x= 0; x <= ex; x++){
 365             y= ((x*f) + (1<<15))>>16;
 366             buf[y*stride + x]+= color;
 367         }
 368     }else{
 369         if(sy > ey){
 370             t=sx; sx=ex; ex=t;
 371             t=sy; sy=ey; ey=t;
 372         }
 373         buf+= sx + sy*stride;
 374         ey-= sy;
 375         if(ey) f= ((ex-sx)<<16)/ey;
 376         else   f= 0;
 377         for(y= 0; y <= ey; y++){
 378             x= ((y*f) + (1<<15))>>16;
 379             buf[y*stride + x]+= color;
 380         }
 381     }
 382 }
 383
 384 /**
 385  * draws an arrow from (ex, ey) -> (sx, sy).
 386  * @param w width of the image
 387  * @param h height of the image
 388  * @param stride stride/linesize of the image
 389  * @param color color of the arrow
 390  */
 391 static void draw_arrow(uint8_t *buf, int sx, int sy, int ex, int ey, int w, int h, int stride, int color){
 392     int dx= ex - sx;
 393     int dy= ey - sy;
 394
 395     if(dx*dx + dy*dy > 3*3){
 396         int rx=  dx + dy;
 397         int ry= -dx + dy;
 398         int length= ff_sqrt((rx*rx + ry*ry)<<8);
 399
 400         //FIXME subpixel accuracy
 401         rx= ROUNDED_DIV(rx*3<<4, length);
 402         ry= ROUNDED_DIV(ry*3<<4, length);
 403
 404         draw_line(buf, sx, sy, sx + rx, sy + ry, w, h, stride, color);
 405         draw_line(buf, sx, sy, sx - ry, sy + rx, w, h, stride, color);
 406     }
 407     draw_line(buf, sx, sy, ex, ey, w, h, stride, color);
 408 }
 409
 410 int ff_h263_decode_frame(AVCodecContext *avctx,
 411                              void *data, int *data_size,
 412                              uint8_t *buf, int buf_size)
 413 {
 414     MpegEncContext *s = avctx->priv_data;
 415     int ret,i;
 416     AVFrame *pict = data;
 417     float new_aspect;
 418
 419 #ifdef PRINT_FRAME_TIME
 420 uint64_t time= rdtsc();
 421 #endif
 422 #ifdef DEBUG
 423     printf("*****frame %d size=%d\n", avctx->frame_number, buf_size);
 424     printf("bytes=%x %x %x %x\n", buf[0], buf[1], buf[2], buf[3]);
 425 #endif
 426     s->flags= avctx->flags;
 427
 428     *data_size = 0;
 429
 430    /* no supplementary picture */
 431     if (buf_size == 0) {
 432         return 0;
 433     }
 434
 435     if(s->flags&CODEC_FLAG_TRUNCATED){
 436         int next;
 437
 438         if(s->codec_id==CODEC_ID_MPEG4){
 439             next= mpeg4_find_frame_end(s, buf, buf_size);
 440         }else{
 441             fprintf(stderr, "this codec doesnt support truncated bitstreams\n");
 442             return -1;
 443         }
 444
 445         if( ff_combine_frame(s, next, &buf, &buf_size) < 0 )
 446             return buf_size;
 447     }
 448
 449 retry:
 450
 451     if(s->bitstream_buffer_size && buf_size<20){ //divx 5.01+ frame reorder
 452         init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
 453     }else
 454         init_get_bits(&s->gb, buf, buf_size*8);
 455     s->bitstream_buffer_size=0;
 456
 457     if (!s->context_initialized) {
 458         if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
 459             return -1;
 460     }
 461
 462     /* let's go :-) */
 463     if (s->msmpeg4_version==5) {
 464         ret= ff_wmv2_decode_picture_header(s);
 465     } else if (s->msmpeg4_version) {
 466         ret = msmpeg4_decode_picture_header(s);
 467     } else if (s->h263_pred) {
 468         if(s->avctx->extradata_size && s->picture_number==0){
 469             GetBitContext gb;
 470
 471             init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
 472             ret = ff_mpeg4_decode_picture_header(s, &gb);
 473         }
 474         ret = ff_mpeg4_decode_picture_header(s, &s->gb);
 475
 476         if(s->flags& CODEC_FLAG_LOW_DELAY)
 477             s->low_delay=1;
 478     } else if (s->h263_intel) {
 479         ret = intel_h263_decode_picture_header(s);
 480     } else {
 481         ret = h263_decode_picture_header(s);
 482     }
 483     avctx->has_b_frames= !s->low_delay;
 484
 485     if(s->workaround_bugs&FF_BUG_AUTODETECT){
 486         if(s->padding_bug_score > -2 && !s->data_partitioning)
 487             s->workaround_bugs |=  FF_BUG_NO_PADDING;
 488         else
 489             s->workaround_bugs &= ~FF_BUG_NO_PADDING;
 490
 491         if(s->avctx->codec_tag == ff_get_fourcc("XVIX"))
 492             s->workaround_bugs|= FF_BUG_XVID_ILACE;
 493 #if 0
 494         if(s->avctx->codec_tag == ff_get_fourcc("MP4S"))
 495             s->workaround_bugs|= FF_BUG_AC_VLC;
 496
 497         if(s->avctx->codec_tag == ff_get_fourcc("M4S2"))
 498             s->workaround_bugs|= FF_BUG_AC_VLC;
 499 #endif
 500         if(s->avctx->codec_tag == ff_get_fourcc("UMP4")){
 501             s->workaround_bugs|= FF_BUG_UMP4;
 502             s->workaround_bugs|= FF_BUG_AC_VLC;
 503         }
 504
 505         if(s->divx_version){
 506             s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
 507         }
 508
 509         if(s->divx_version>502){
 510             s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
 511         }
 512
 513         if(s->avctx->codec_tag == ff_get_fourcc("XVID") && s->xvid_build==0)
 514             s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
 515
 516         if(s->avctx->codec_tag == ff_get_fourcc("XVID") && s->xvid_build==0)
 517             s->padding_bug_score= 256*256*256*64;
 518
 519         if(s->xvid_build && s->xvid_build<=3)
 520             s->padding_bug_score= 256*256*256*64;
 521
 522         if(s->xvid_build && s->xvid_build<=1)
 523             s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
 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->divx_version)
 537             s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
 538 //printf("padding_bug_score: %d\n", s->padding_bug_score);
 539         if(s->divx_version==501 && s->divx_build==20020416)
 540             s->padding_bug_score= 256*256*256*64;
 541 #if 0
 542         if(s->divx_version==500)
 543             s->padding_bug_score= 256*256*256*64;
 544
 545         /* very ugly XVID padding bug detection FIXME/XXX solve this differently
 546          * lets hope this at least works
 547          */
 548         if(   s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==0
 549            && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
 550             s->workaround_bugs|= FF_BUG_NO_PADDING;
 551
 552         if(s->lavc_build && s->lavc_build<4609) //FIXME not sure about the version num but a 4609 file seems ok
 553             s->workaround_bugs|= FF_BUG_NO_PADDING;
 554 #endif
 555     }
 556
 557     if(s->workaround_bugs& FF_BUG_STD_QPEL){
 558         SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
 559         SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
 560         SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
 561         SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
 562         SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
 563         SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
 564
 565         SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
 566         SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
 567         SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
 568         SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
 569         SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
 570         SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
 571     }
 572
 573 #if 0 // dump bits per frame / qp / complexity
 574 {
 575     static FILE *f=NULL;
 576     if(!f) f=fopen("rate_qp_cplx.txt", "w");
 577     fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
 578 }
 579 #endif
 580
 581         /* After H263 & mpeg4 header decode we have the height, width,*/
 582         /* and other parameters. So then we could init the picture   */
 583         /* FIXME: By the way H263 decoder is evolving it should have */
 584         /* an H263EncContext                                         */
 585     if(s->aspected_height)
 586         new_aspect= s->aspected_width*s->width / (float)(s->height*s->aspected_height);
 587     else
 588         new_aspect=0;
 589
 590     if (   s->width != avctx->width || s->height != avctx->height
 591         || ABS(new_aspect - avctx->aspect_ratio) > 0.001) {
 592         /* H.263 could change picture size any time */
 593         MPV_common_end(s);
 594         s->context_initialized=0;
 595     }
 596     if (!s->context_initialized) {
 597         avctx->width = s->width;
 598         avctx->height = s->height;
 599         avctx->aspect_ratio= new_aspect;
 600
 601         goto retry;
 602     }
 603
 604     if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P))
 605         s->gob_index = ff_h263_get_gob_height(s);
 606
 607     if(ret==FRAME_SKIPED) return get_consumed_bytes(s, buf_size);
 608     /* skip if the header was thrashed */
 609     if (ret < 0){
 610         fprintf(stderr, "header damaged\n");
 611         return -1;
 612     }
 613
 614     // for hurry_up==5
 615     s->current_picture.pict_type= s->pict_type;
 616     s->current_picture.key_frame= s->pict_type == I_TYPE;
 617
 618     /* skip b frames if we dont have reference frames */
 619     if(s->last_picture.data[0]==NULL && s->pict_type==B_TYPE) return get_consumed_bytes(s, buf_size);
 620     /* skip b frames if we are in a hurry */
 621     if(avctx->hurry_up && s->pict_type==B_TYPE) return get_consumed_bytes(s, buf_size);
 622     /* skip everything if we are in a hurry>=5 */
 623     if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
 624
 625     if(s->next_p_frame_damaged){
 626         if(s->pict_type==B_TYPE)
 627             return get_consumed_bytes(s, buf_size);
 628         else
 629             s->next_p_frame_damaged=0;
 630     }
 631
 632     if(MPV_frame_start(s, avctx) < 0)
 633         return -1;
 634
 635 #ifdef DEBUG
 636     printf("qscale=%d\n", s->qscale);
 637 #endif
 638
 639     if(s->error_resilience)
 640         memset(s->error_status_table, MV_ERROR|AC_ERROR|DC_ERROR|VP_START|AC_END|DC_END|MV_END, s->mb_num*sizeof(uint8_t));
 641
 642     /* decode each macroblock */
 643     s->block_wrap[0]=
 644     s->block_wrap[1]=
 645     s->block_wrap[2]=
 646     s->block_wrap[3]= s->mb_width*2 + 2;
 647     s->block_wrap[4]=
 648     s->block_wrap[5]= s->mb_width + 2;
 649     s->mb_x=0;
 650     s->mb_y=0;
 651
 652     decode_slice(s);
 653     s->error_status_table[0]|= VP_START;
 654     while(s->mb_y<s->mb_height && s->gb.size_in_bits - get_bits_count(&s->gb)>16){
 655         if(s->msmpeg4_version){
 656             if(s->mb_x!=0 || (s->mb_y%s->slice_height)!=0)
 657                 break;
 658         }else{
 659             if(ff_h263_resync(s)<0)
 660                 break;
 661         }
 662
 663         if(s->msmpeg4_version<4 && s->h263_pred)
 664             ff_mpeg4_clean_buffers(s);
 665
 666         decode_slice(s);
 667
 668         s->error_status_table[s->resync_mb_x + s->resync_mb_y*s->mb_width]|= VP_START;
 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_version>=500){
 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     if(s->error_resilience){
 698         int error=0, num_end_markers=0;
 699         for(i=0; i<s->mb_num; i++){
 700             int status= s->error_status_table[i];
 701 #if 0
 702             if(i%s->mb_width == 0) printf("\n");
 703             printf("%2X ", status);
 704 #endif
 705             if(status==0) continue;
 706
 707             if(status&(DC_ERROR|AC_ERROR|MV_ERROR))
 708                 error=1;
 709             if(status&VP_START){
 710                 if(num_end_markers)
 711                     error=1;
 712                 num_end_markers=3;
 713             }
 714             if(status&AC_END)
 715                 num_end_markers--;
 716             if(status&DC_END)
 717                 num_end_markers--;
 718             if(status&MV_END)
 719                 num_end_markers--;
 720         }
 721         if(num_end_markers || error){
 722             fprintf(stderr, "concealing errors\n");
 723             ff_error_resilience(s);
 724         }
 725     }
 726
 727     MPV_frame_end(s);
 728
 729     if((avctx->debug&FF_DEBUG_VIS_MV) && s->last_picture.data[0]){
 730         const int shift= 1 + s->quarter_sample;
 731         int mb_y;
 732         uint8_t *ptr= s->last_picture.data[0];
 733         s->low_delay=0; //needed to see the vectors without trashing the buffers
 734
 735         for(mb_y=0; mb_y<s->mb_height; mb_y++){
 736             int mb_x;
 737             for(mb_x=0; mb_x<s->mb_width; mb_x++){
 738                 const int mb_index= mb_x + mb_y*s->mb_width;
 739                 if(s->co_located_type_table[mb_index] == MV_TYPE_8X8){
 740                     int i;
 741                     for(i=0; i<4; i++){
 742                         int sx= mb_x*16 + 4 + 8*(i&1);
 743                         int sy= mb_y*16 + 4 + 8*(i>>1);
 744                         int xy= 1 + mb_x*2 + (i&1) + (mb_y*2 + 1 + (i>>1))*(s->mb_width*2 + 2);
 745                         int mx= (s->motion_val[xy][0]>>shift) + sx;
 746                         int my= (s->motion_val[xy][1]>>shift) + sy;
 747                         draw_arrow(ptr, sx, sy, mx, my, s->width, s->height, s->linesize, 100);
 748                     }
 749                 }else{
 750                     int sx= mb_x*16 + 8;
 751                     int sy= mb_y*16 + 8;
 752                     int xy= 1 + mb_x*2 + (mb_y*2 + 1)*(s->mb_width*2 + 2);
 753                     int mx= (s->motion_val[xy][0]>>shift) + sx;
 754                     int my= (s->motion_val[xy][1]>>shift) + sy;
 755                     draw_arrow(ptr, sx, sy, mx, my, s->width, s->height, s->linesize, 100);
 756                 }
 757                 s->mbskip_table[mb_index]=0;
 758             }
 759         }
 760     }
 761
 762
 763     if(s->pict_type==B_TYPE || s->low_delay){
 764         *pict= *(AVFrame*)&s->current_picture;
 765     } else {
 766         *pict= *(AVFrame*)&s->last_picture;
 767     }
 768
 769     if(avctx->debug&FF_DEBUG_QP){
 770         int8_t *qtab= pict->qscale_table;
 771         int x,y;
 772
 773         for(y=0; y<s->mb_height; y++){
 774             for(x=0; x<s->mb_width; x++){
 775                 printf("%2d ", qtab[x + y*s->mb_width]);
 776             }
 777             printf("\n");
 778         }
 779         printf("\n");
 780     }
 781
 782     /* Return the Picture timestamp as the frame number */
 783     /* we substract 1 because it is added on utils.c    */
 784     avctx->frame_number = s->picture_number - 1;
 785
 786     /* dont output the last pic after seeking */
 787     if(s->last_picture.data[0] || s->low_delay)
 788         *data_size = sizeof(AVFrame);
 789 #ifdef PRINT_FRAME_TIME
 790 printf("%Ld\n", rdtsc()-time);
 791 #endif
 792     return get_consumed_bytes(s, buf_size);
 793 }
 794
 795 AVCodec mpeg4_decoder = {
 796     "mpeg4",
 797     CODEC_TYPE_VIDEO,
 798     CODEC_ID_MPEG4,
 799     sizeof(MpegEncContext),
 800     ff_h263_decode_init,
 801     NULL,
 802     ff_h263_decode_end,
 803     ff_h263_decode_frame,
 804     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
 805 };
 806
 807 AVCodec h263_decoder = {
 808     "h263",
 809     CODEC_TYPE_VIDEO,
 810     CODEC_ID_H263,
 811     sizeof(MpegEncContext),
 812     ff_h263_decode_init,
 813     NULL,
 814     ff_h263_decode_end,
 815     ff_h263_decode_frame,
 816     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 817 };
 818
 819 AVCodec msmpeg4v1_decoder = {
 820     "msmpeg4v1",
 821     CODEC_TYPE_VIDEO,
 822     CODEC_ID_MSMPEG4V1,
 823     sizeof(MpegEncContext),
 824     ff_h263_decode_init,
 825     NULL,
 826     ff_h263_decode_end,
 827     ff_h263_decode_frame,
 828     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 829 };
 830
 831 AVCodec msmpeg4v2_decoder = {
 832     "msmpeg4v2",
 833     CODEC_TYPE_VIDEO,
 834     CODEC_ID_MSMPEG4V2,
 835     sizeof(MpegEncContext),
 836     ff_h263_decode_init,
 837     NULL,
 838     ff_h263_decode_end,
 839     ff_h263_decode_frame,
 840     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 841 };
 842
 843 AVCodec msmpeg4v3_decoder = {
 844     "msmpeg4",
 845     CODEC_TYPE_VIDEO,
 846     CODEC_ID_MSMPEG4V3,
 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 };
 854
 855 AVCodec wmv1_decoder = {
 856     "wmv1",
 857     CODEC_TYPE_VIDEO,
 858     CODEC_ID_WMV1,
 859     sizeof(MpegEncContext),
 860     ff_h263_decode_init,
 861     NULL,
 862     ff_h263_decode_end,
 863     ff_h263_decode_frame,
 864     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 865 };
 866
 867 AVCodec h263i_decoder = {
 868     "h263i",
 869     CODEC_TYPE_VIDEO,
 870     CODEC_ID_H263I,
 871     sizeof(MpegEncContext),
 872     ff_h263_decode_init,
 873     NULL,
 874     ff_h263_decode_end,
 875     ff_h263_decode_frame,
 876     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 877 };
 878