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 != 1){
 259             int v= show_bits(&s->gb, 8);
 260             v|= 0x7F >> (7-(bits_count&7));
 261
 262             if(v==0x7F && bits_left<=8)
 263                 s->padding_bug_score--;
 264             else if(v==0x7F && ((get_bits_count(&s->gb)+8)&8) && bits_left<=16)
 265                 s->padding_bug_score+= 4;
 266             else
 267                 s->padding_bug_score++;
 268         }
 269     }
 270
 271     if(s->workaround_bugs&FF_BUG_AUTODETECT){
 272         if(s->padding_bug_score > -2 && !s->data_partitioning && (s->divx_version || !s->resync_marker))
 273             s->workaround_bugs |=  FF_BUG_NO_PADDING;
 274         else
 275             s->workaround_bugs &= ~FF_BUG_NO_PADDING;
 276     }
 277
 278     // handle formats which dont have unique end markers
 279     if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
 280         int left= s->gb.size_in_bits - get_bits_count(&s->gb);
 281         int max_extra=7;
 282
 283         /* no markers in M$ crap */
 284         if(s->msmpeg4_version && s->pict_type==I_TYPE)
 285             max_extra+= 17;
 286
 287         /* buggy padding but the frame should still end approximately at the bitstream end */
 288         if((s->workaround_bugs&FF_BUG_NO_PADDING) && s->error_resilience>=3)
 289             max_extra+= 48;
 290         else if((s->workaround_bugs&FF_BUG_NO_PADDING))
 291             max_extra+= 256*256*256*64;
 292
 293         if(left>max_extra){
 294             av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
 295         }
 296         else if(left<0){
 297             av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
 298         }else
 299             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);
 300
 301         return 0;
 302     }
 303
 304     av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
 305             s->gb.size_in_bits - get_bits_count(&s->gb),
 306             show_bits(&s->gb, 24), s->padding_bug_score);
 307
 308     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);
 309
 310     return -1;
 311 }
 312
 313 /**
 314  * finds the end of the current frame in the bitstream.
 315  * @return the position of the first byte of the next frame, or -1
 316  */
 317 int ff_mpeg4_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size){
 318     int vop_found, i;
 319     uint32_t state;
 320
 321     vop_found= pc->frame_start_found;
 322     state= pc->state;
 323
 324     i=0;
 325     if(!vop_found){
 326         for(i=0; i<buf_size; i++){
 327             state= (state<<8) | buf[i];
 328             if(state == 0x1B6){
 329                 i++;
 330                 vop_found=1;
 331                 break;
 332             }
 333         }
 334     }
 335
 336     if(vop_found){
 337         /* EOF considered as end of frame */
 338         if (buf_size == 0)
 339             return 0;
 340         for(; i<buf_size; i++){
 341             state= (state<<8) | buf[i];
 342             if((state&0xFFFFFF00) == 0x100){
 343                 pc->frame_start_found=0;
 344                 pc->state=-1;
 345                 return i-3;
 346             }
 347         }
 348     }
 349     pc->frame_start_found= vop_found;
 350     pc->state= state;
 351     return END_NOT_FOUND;
 352 }
 353
 354 static int h263_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size){
 355     int vop_found, i;
 356     uint32_t state;
 357
 358     vop_found= pc->frame_start_found;
 359     state= pc->state;
 360
 361     i=0;
 362     if(!vop_found){
 363         for(i=0; i<buf_size; i++){
 364             state= (state<<8) | buf[i];
 365             if(state>>(32-22) == 0x20){
 366                 i++;
 367                 vop_found=1;
 368                 break;
 369             }
 370         }
 371     }
 372
 373     if(vop_found){
 374       for(; i<buf_size; i++){
 375         state= (state<<8) | buf[i];
 376         if(state>>(32-22) == 0x20){
 377             pc->frame_start_found=0;
 378             pc->state=-1;
 379             return i-3;
 380         }
 381       }
 382     }
 383     pc->frame_start_found= vop_found;
 384     pc->state= state;
 385
 386     return END_NOT_FOUND;
 387 }
 388
 389 static int h263_parse(AVCodecParserContext *s,
 390                            AVCodecContext *avctx,
 391                            uint8_t **poutbuf, int *poutbuf_size,
 392                            const uint8_t *buf, int buf_size)
 393 {
 394     ParseContext *pc = s->priv_data;
 395     int next;
 396
 397     next= h263_find_frame_end(pc, buf, buf_size);
 398
 399     if (ff_combine_frame(pc, next, (uint8_t **)&buf, &buf_size) < 0) {
 400         *poutbuf = NULL;
 401         *poutbuf_size = 0;
 402         return buf_size;
 403     }
 404
 405     *poutbuf = (uint8_t *)buf;
 406     *poutbuf_size = buf_size;
 407     return next;
 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;
 416     AVFrame *pict = data;
 417
 418 #ifdef PRINT_FRAME_TIME
 419 uint64_t time= rdtsc();
 420 #endif
 421 #ifdef DEBUG
 422     printf("*****frame %d size=%d\n", avctx->frame_number, buf_size);
 423     printf("bytes=%x %x %x %x\n", buf[0], buf[1], buf[2], buf[3]);
 424 #endif
 425     s->flags= avctx->flags;
 426     s->flags2= avctx->flags2;
 427
 428     /* no supplementary picture */
 429     if (buf_size == 0) {
 430         /* special case for last picture */
 431         if (s->low_delay==0 && s->next_picture_ptr) {
 432             *pict= *(AVFrame*)s->next_picture_ptr;
 433             s->next_picture_ptr= NULL;
 434
 435             *data_size = sizeof(AVFrame);
 436         }
 437
 438         return 0;
 439     }
 440
 441     if(s->flags&CODEC_FLAG_TRUNCATED){
 442         int next;
 443
 444         if(s->codec_id==CODEC_ID_MPEG4){
 445             next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
 446         }else if(s->codec_id==CODEC_ID_H263){
 447             next= h263_find_frame_end(&s->parse_context, buf, buf_size);
 448         }else{
 449             av_log(s->avctx, AV_LOG_ERROR, "this codec doesnt support truncated bitstreams\n");
 450             return -1;
 451         }
 452
 453         if( ff_combine_frame(&s->parse_context, next, &buf, &buf_size) < 0 )
 454             return buf_size;
 455     }
 456
 457
 458 retry:
 459
 460     if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
 461         init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
 462     }else
 463         init_get_bits(&s->gb, buf, buf_size*8);
 464     s->bitstream_buffer_size=0;
 465
 466     if (!s->context_initialized) {
 467         if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
 468             return -1;
 469     }
 470
 471     //we need to set current_picture_ptr before reading the header, otherwise we cant store anyting im there
 472     if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){
 473         int i= ff_find_unused_picture(s, 0);
 474         s->current_picture_ptr= &s->picture[i];
 475     }
 476
 477     /* let's go :-) */
 478     if (s->msmpeg4_version==5) {
 479         ret= ff_wmv2_decode_picture_header(s);
 480     } else if (s->msmpeg4_version) {
 481         ret = msmpeg4_decode_picture_header(s);
 482     } else if (s->h263_pred) {
 483         if(s->avctx->extradata_size && s->picture_number==0){
 484             GetBitContext gb;
 485
 486             init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
 487             ret = ff_mpeg4_decode_picture_header(s, &gb);
 488         }
 489         ret = ff_mpeg4_decode_picture_header(s, &s->gb);
 490
 491         if(s->flags& CODEC_FLAG_LOW_DELAY)
 492             s->low_delay=1;
 493     } else if (s->codec_id == CODEC_ID_H263I) {
 494         ret = intel_h263_decode_picture_header(s);
 495     } else if (s->h263_flv) {
 496         ret = flv_h263_decode_picture_header(s);
 497     } else {
 498         ret = h263_decode_picture_header(s);
 499     }
 500
 501     if(ret==FRAME_SKIPED) return get_consumed_bytes(s, buf_size);
 502
 503     /* skip if the header was thrashed */
 504     if (ret < 0){
 505         av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
 506         return -1;
 507     }
 508
 509     avctx->has_b_frames= !s->low_delay;
 510
 511     if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
 512         if(s->avctx->stream_codec_tag == ff_get_fourcc("XVID") ||
 513            s->avctx->codec_tag == ff_get_fourcc("XVID") || s->avctx->codec_tag == ff_get_fourcc("XVIX"))
 514             s->xvid_build= -1;
 515 #if 0
 516         if(s->avctx->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
 517            && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
 518             s->xvid_build= -1;
 519 #endif
 520     }
 521
 522     if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
 523         if(s->avctx->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
 524             s->divx_version= 400; //divx 4
 525     }
 526
 527     if(s->xvid_build && s->divx_version){
 528         s->divx_version=
 529         s->divx_build= 0;
 530     }
 531
 532     if(s->workaround_bugs&FF_BUG_AUTODETECT){
 533         if(s->avctx->codec_tag == ff_get_fourcc("XVIX"))
 534             s->workaround_bugs|= FF_BUG_XVID_ILACE;
 535
 536         if(s->avctx->codec_tag == ff_get_fourcc("UMP4")){
 537             s->workaround_bugs|= FF_BUG_UMP4;
 538         }
 539
 540         if(s->divx_version>=500){
 541             s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
 542         }
 543
 544         if(s->divx_version>502){
 545             s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
 546         }
 547
 548         if(s->xvid_build && s->xvid_build<=3)
 549             s->padding_bug_score= 256*256*256*64;
 550
 551         if(s->xvid_build && s->xvid_build<=1)
 552             s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
 553
 554         if(s->xvid_build && s->xvid_build<=12)
 555             s->workaround_bugs|= FF_BUG_EDGE;
 556
 557         if(s->xvid_build && s->xvid_build<=32)
 558             s->workaround_bugs|= FF_BUG_DC_CLIP;
 559
 560 #define SET_QPEL_FUNC(postfix1, postfix2) \
 561     s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
 562     s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
 563     s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
 564
 565         if(s->lavc_build && s->lavc_build<4653)
 566             s->workaround_bugs|= FF_BUG_STD_QPEL;
 567
 568         if(s->lavc_build && s->lavc_build<4655)
 569             s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
 570
 571         if(s->lavc_build && s->lavc_build<4670){
 572             s->workaround_bugs|= FF_BUG_EDGE;
 573         }
 574
 575         if(s->lavc_build && s->lavc_build<=4712)
 576             s->workaround_bugs|= FF_BUG_DC_CLIP;
 577
 578         if(s->divx_version)
 579             s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
 580 //printf("padding_bug_score: %d\n", s->padding_bug_score);
 581         if(s->divx_version==501 && s->divx_build==20020416)
 582             s->padding_bug_score= 256*256*256*64;
 583
 584         if(s->divx_version && s->divx_version<500){
 585             s->workaround_bugs|= FF_BUG_EDGE;
 586         }
 587
 588         if(s->divx_version)
 589             s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
 590 #if 0
 591         if(s->divx_version==500)
 592             s->padding_bug_score= 256*256*256*64;
 593
 594         /* very ugly XVID padding bug detection FIXME/XXX solve this differently
 595          * lets hope this at least works
 596          */
 597         if(   s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==0
 598            && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
 599             s->workaround_bugs|= FF_BUG_NO_PADDING;
 600
 601         if(s->lavc_build && s->lavc_build<4609) //FIXME not sure about the version num but a 4609 file seems ok
 602             s->workaround_bugs|= FF_BUG_NO_PADDING;
 603 #endif
 604     }
 605
 606     if(s->workaround_bugs& FF_BUG_STD_QPEL){
 607         SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
 608         SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
 609         SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
 610         SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
 611         SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
 612         SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
 613
 614         SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
 615         SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
 616         SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
 617         SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
 618         SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
 619         SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
 620     }
 621
 622     if(avctx->debug & FF_DEBUG_BUGS)
 623         av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
 624                s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
 625                s->divx_packed ? "p" : "");
 626
 627 #if 0 // dump bits per frame / qp / complexity
 628 {
 629     static FILE *f=NULL;
 630     if(!f) f=fopen("rate_qp_cplx.txt", "w");
 631     fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
 632 }
 633 #endif
 634
 635 #ifdef HAVE_MMX
 636     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)){
 637         avctx->idct_algo= FF_IDCT_LIBMPEG2MMX;
 638         avctx->coded_width= 0; // force reinit
 639     }
 640 #endif
 641
 642         /* After H263 & mpeg4 header decode we have the height, width,*/
 643         /* and other parameters. So then we could init the picture   */
 644         /* FIXME: By the way H263 decoder is evolving it should have */
 645         /* an H263EncContext                                         */
 646
 647     if (   s->width  != avctx->coded_width
 648         || s->height != avctx->coded_height) {
 649         /* H.263 could change picture size any time */
 650         ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
 651         s->parse_context.buffer=0;
 652         MPV_common_end(s);
 653         s->parse_context= pc;
 654     }
 655     if (!s->context_initialized) {
 656         avcodec_set_dimensions(avctx, s->width, s->height);
 657
 658         goto retry;
 659     }
 660
 661     if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P))
 662         s->gob_index = ff_h263_get_gob_height(s);
 663
 664     // for hurry_up==5
 665     s->current_picture.pict_type= s->pict_type;
 666     s->current_picture.key_frame= s->pict_type == I_TYPE;
 667
 668     /* skip b frames if we dont have reference frames */
 669     if(s->last_picture_ptr==NULL && (s->pict_type==B_TYPE || s->dropable)) return get_consumed_bytes(s, buf_size);
 670     /* skip b frames if we are in a hurry */
 671     if(avctx->hurry_up && s->pict_type==B_TYPE) return get_consumed_bytes(s, buf_size);
 672     /* skip everything if we are in a hurry>=5 */
 673     if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
 674
 675     if(s->next_p_frame_damaged){
 676         if(s->pict_type==B_TYPE)
 677             return get_consumed_bytes(s, buf_size);
 678         else
 679             s->next_p_frame_damaged=0;
 680     }
 681
 682     if(MPV_frame_start(s, avctx) < 0)
 683         return -1;
 684
 685 #ifdef DEBUG
 686     printf("qscale=%d\n", s->qscale);
 687 #endif
 688
 689     ff_er_frame_start(s);
 690
 691     //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
 692     //which isnt available before MPV_frame_start()
 693     if (s->msmpeg4_version==5){
 694         if(ff_wmv2_decode_secondary_picture_header(s) < 0)
 695             return -1;
 696     }
 697
 698     /* decode each macroblock */
 699     s->mb_x=0;
 700     s->mb_y=0;
 701
 702     decode_slice(s);
 703     while(s->mb_y<s->mb_height){
 704         if(s->msmpeg4_version){
 705             if(s->mb_x!=0 || (s->mb_y%s->slice_height)!=0 || get_bits_count(&s->gb) > s->gb.size_in_bits)
 706                 break;
 707         }else{
 708             if(ff_h263_resync(s)<0)
 709                 break;
 710         }
 711
 712         if(s->msmpeg4_version<4 && s->h263_pred)
 713             ff_mpeg4_clean_buffers(s);
 714
 715         decode_slice(s);
 716     }
 717
 718     if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==I_TYPE)
 719         if(msmpeg4_decode_ext_header(s, buf_size) < 0){
 720             s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
 721         }
 722
 723     /* divx 5.01+ bistream reorder stuff */
 724     if(s->codec_id==CODEC_ID_MPEG4 && s->bitstream_buffer_size==0 && s->divx_packed){
 725         int current_pos= get_bits_count(&s->gb)>>3;
 726         int startcode_found=0;
 727
 728         if(   buf_size - current_pos > 5
 729            && buf_size - current_pos < BITSTREAM_BUFFER_SIZE){
 730             int i;
 731             for(i=current_pos; i<buf_size-3; i++){
 732                 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
 733                     startcode_found=1;
 734                     break;
 735                 }
 736             }
 737         }
 738         if(s->gb.buffer == s->bitstream_buffer && buf_size>20){ //xvid style
 739             startcode_found=1;
 740             current_pos=0;
 741         }
 742
 743         if(startcode_found){
 744             memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
 745             s->bitstream_buffer_size= buf_size - current_pos;
 746         }
 747     }
 748
 749     ff_er_frame_end(s);
 750
 751     MPV_frame_end(s);
 752
 753 assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);
 754 assert(s->current_picture.pict_type == s->pict_type);
 755     if(s->pict_type==B_TYPE || s->low_delay){
 756         *pict= *(AVFrame*)&s->current_picture;
 757         ff_print_debug_info(s, pict);
 758     } else {
 759         *pict= *(AVFrame*)&s->last_picture;
 760         if(pict)
 761             ff_print_debug_info(s, pict);
 762     }
 763
 764     /* Return the Picture timestamp as the frame number */
 765     /* we substract 1 because it is added on utils.c    */
 766     avctx->frame_number = s->picture_number - 1;
 767
 768     /* dont output the last pic after seeking */
 769     if(s->last_picture_ptr || s->low_delay)
 770         *data_size = sizeof(AVFrame);
 771 #ifdef PRINT_FRAME_TIME
 772 printf("%Ld\n", rdtsc()-time);
 773 #endif
 774
 775     return get_consumed_bytes(s, buf_size);
 776 }
 777
 778 static const AVOption mpeg4_decoptions[] =
 779 {
 780     AVOPTION_SUB(avoptions_workaround_bug),
 781     AVOPTION_END()
 782 };
 783
 784 AVCodec mpeg4_decoder = {
 785     "mpeg4",
 786     CODEC_TYPE_VIDEO,
 787     CODEC_ID_MPEG4,
 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 | CODEC_CAP_TRUNCATED,
 794     .options = mpeg4_decoptions,
 795     .flush= ff_mpeg_flush,
 796 };
 797
 798 AVCodec h263_decoder = {
 799     "h263",
 800     CODEC_TYPE_VIDEO,
 801     CODEC_ID_H263,
 802     sizeof(MpegEncContext),
 803     ff_h263_decode_init,
 804     NULL,
 805     ff_h263_decode_end,
 806     ff_h263_decode_frame,
 807     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
 808     .flush= ff_mpeg_flush,
 809 };
 810
 811 AVCodec msmpeg4v1_decoder = {
 812     "msmpeg4v1",
 813     CODEC_TYPE_VIDEO,
 814     CODEC_ID_MSMPEG4V1,
 815     sizeof(MpegEncContext),
 816     ff_h263_decode_init,
 817     NULL,
 818     ff_h263_decode_end,
 819     ff_h263_decode_frame,
 820     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 821     mpeg4_decoptions,
 822 };
 823
 824 AVCodec msmpeg4v2_decoder = {
 825     "msmpeg4v2",
 826     CODEC_TYPE_VIDEO,
 827     CODEC_ID_MSMPEG4V2,
 828     sizeof(MpegEncContext),
 829     ff_h263_decode_init,
 830     NULL,
 831     ff_h263_decode_end,
 832     ff_h263_decode_frame,
 833     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 834     mpeg4_decoptions,
 835 };
 836
 837 AVCodec msmpeg4v3_decoder = {
 838     "msmpeg4",
 839     CODEC_TYPE_VIDEO,
 840     CODEC_ID_MSMPEG4V3,
 841     sizeof(MpegEncContext),
 842     ff_h263_decode_init,
 843     NULL,
 844     ff_h263_decode_end,
 845     ff_h263_decode_frame,
 846     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 847     .options = mpeg4_decoptions,
 848 };
 849
 850 AVCodec wmv1_decoder = {
 851     "wmv1",
 852     CODEC_TYPE_VIDEO,
 853     CODEC_ID_WMV1,
 854     sizeof(MpegEncContext),
 855     ff_h263_decode_init,
 856     NULL,
 857     ff_h263_decode_end,
 858     ff_h263_decode_frame,
 859     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 860     mpeg4_decoptions,
 861 };
 862
 863 AVCodec h263i_decoder = {
 864     "h263i",
 865     CODEC_TYPE_VIDEO,
 866     CODEC_ID_H263I,
 867     sizeof(MpegEncContext),
 868     ff_h263_decode_init,
 869     NULL,
 870     ff_h263_decode_end,
 871     ff_h263_decode_frame,
 872     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 873     mpeg4_decoptions,
 874 };
 875
 876 AVCodec flv_decoder = {
 877     "flv",
 878     CODEC_TYPE_VIDEO,
 879     CODEC_ID_FLV1,
 880     sizeof(MpegEncContext),
 881     ff_h263_decode_init,
 882     NULL,
 883     ff_h263_decode_end,
 884     ff_h263_decode_frame,
 885     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1
 886 };
 887
 888 AVCodecParser h263_parser = {
 889     { CODEC_ID_H263 },
 890     sizeof(ParseContext),
 891     NULL,
 892     h263_parse,
 893     ff_parse_close,
 894 };