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 file is part of FFmpeg.
   7  *
   8  * FFmpeg is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * FFmpeg is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with FFmpeg; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 /**
  24  * @file h263dec.c
  25  * H.263 decoder.
  26  */
  27
  28 #include "avcodec.h"
  29 #include "dsputil.h"
  30 #include "mpegvideo.h"
  31
  32 //#define DEBUG
  33 //#define PRINT_FRAME_TIME
  34
  35 int ff_h263_decode_init(AVCodecContext *avctx)
  36 {
  37     MpegEncContext *s = avctx->priv_data;
  38
  39     s->avctx = avctx;
  40     s->out_format = FMT_H263;
  41
  42     s->width  = avctx->coded_width;
  43     s->height = avctx->coded_height;
  44     s->workaround_bugs= avctx->workaround_bugs;
  45
  46     // set defaults
  47     MPV_decode_defaults(s);
  48     s->quant_precision=5;
  49     s->decode_mb= ff_h263_decode_mb;
  50     s->low_delay= 1;
  51     avctx->pix_fmt= PIX_FMT_YUV420P;
  52     s->unrestricted_mv= 1;
  53
  54     /* select sub codec */
  55     switch(avctx->codec->id) {
  56     case CODEC_ID_H263:
  57         s->unrestricted_mv= 0;
  58         break;
  59     case CODEC_ID_MPEG4:
  60         s->decode_mb= ff_mpeg4_decode_mb;
  61         s->time_increment_bits = 4; /* default value for broken headers */
  62         s->h263_pred = 1;
  63         s->low_delay = 0; //default, might be overriden in the vol header during header parsing
  64         break;
  65     case CODEC_ID_MSMPEG4V1:
  66         s->h263_msmpeg4 = 1;
  67         s->h263_pred = 1;
  68         s->msmpeg4_version=1;
  69         break;
  70     case CODEC_ID_MSMPEG4V2:
  71         s->h263_msmpeg4 = 1;
  72         s->h263_pred = 1;
  73         s->msmpeg4_version=2;
  74         break;
  75     case CODEC_ID_MSMPEG4V3:
  76         s->h263_msmpeg4 = 1;
  77         s->h263_pred = 1;
  78         s->msmpeg4_version=3;
  79         break;
  80     case CODEC_ID_WMV1:
  81         s->h263_msmpeg4 = 1;
  82         s->h263_pred = 1;
  83         s->msmpeg4_version=4;
  84         break;
  85     case CODEC_ID_WMV2:
  86         s->h263_msmpeg4 = 1;
  87         s->h263_pred = 1;
  88         s->msmpeg4_version=5;
  89         break;
  90     case CODEC_ID_VC1:
  91     case CODEC_ID_WMV3:
  92         s->h263_msmpeg4 = 1;
  93         s->h263_pred = 1;
  94         s->msmpeg4_version=6;
  95         break;
  96     case CODEC_ID_H263I:
  97         break;
  98     case CODEC_ID_FLV1:
  99         s->h263_flv = 1;
 100         break;
 101     default:
 102         return -1;
 103     }
 104     s->codec_id= avctx->codec->id;
 105
 106     /* for h263, we allocate the images after having read the header */
 107     if (avctx->codec->id != CODEC_ID_H263 && avctx->codec->id != CODEC_ID_MPEG4)
 108         if (MPV_common_init(s) < 0)
 109             return -1;
 110
 111     if (s->h263_msmpeg4)
 112         ff_msmpeg4_decode_init(s);
 113     else
 114         h263_decode_init_vlc(s);
 115
 116     return 0;
 117 }
 118
 119 int ff_h263_decode_end(AVCodecContext *avctx)
 120 {
 121     MpegEncContext *s = avctx->priv_data;
 122
 123     MPV_common_end(s);
 124     return 0;
 125 }
 126
 127 /**
 128  * returns the number of bytes consumed for building the current frame
 129  */
 130 static int get_consumed_bytes(MpegEncContext *s, int buf_size){
 131     int pos= (get_bits_count(&s->gb)+7)>>3;
 132
 133     if(s->divx_packed){
 134         //we would have to scan through the whole buf to handle the weird reordering ...
 135         return buf_size;
 136     }else if(s->flags&CODEC_FLAG_TRUNCATED){
 137         pos -= s->parse_context.last_index;
 138         if(pos<0) pos=0; // padding is not really read so this might be -1
 139         return pos;
 140     }else{
 141         if(pos==0) pos=1; //avoid infinite loops (i doubt thats needed but ...)
 142         if(pos+10>buf_size) pos=buf_size; // oops ;)
 143
 144         return pos;
 145     }
 146 }
 147
 148 static int decode_slice(MpegEncContext *s){
 149     const int part_mask= s->partitioned_frame ? (AC_END|AC_ERROR) : 0x7F;
 150     const int mb_size= 16>>s->avctx->lowres;
 151     s->last_resync_gb= s->gb;
 152     s->first_slice_line= 1;
 153
 154     s->resync_mb_x= s->mb_x;
 155     s->resync_mb_y= s->mb_y;
 156
 157     ff_set_qscale(s, s->qscale);
 158
 159     if(s->partitioned_frame){
 160         const int qscale= s->qscale;
 161
 162         if(s->codec_id==CODEC_ID_MPEG4){
 163             if(ff_mpeg4_decode_partitions(s) < 0)
 164                 return -1;
 165         }
 166
 167         /* restore variables which were modified */
 168         s->first_slice_line=1;
 169         s->mb_x= s->resync_mb_x;
 170         s->mb_y= s->resync_mb_y;
 171         ff_set_qscale(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
 202             s->mv_dir = MV_DIR_FORWARD;
 203             s->mv_type = MV_TYPE_16X16;
 204 //            s->mb_skipped = 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             if (s->pict_type!=B_TYPE)
 209                 ff_h263_update_motion_val(s);
 210
 211             if(ret<0){
 212                 const int xy= s->mb_x + s->mb_y*s->mb_stride;
 213                 if(ret==SLICE_END){
 214                     MPV_decode_mb(s, s->block);
 215                     if(s->loop_filter)
 216                         ff_h263_loop_filter(s);
 217
 218 //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));
 219                     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);
 220
 221                     s->padding_bug_score--;
 222
 223                     if(++s->mb_x >= s->mb_width){
 224                         s->mb_x=0;
 225                         ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
 226                         s->mb_y++;
 227                     }
 228                     return 0;
 229                 }else if(ret==SLICE_NOEND){
 230                     av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy);
 231                     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);
 232                     return -1;
 233                 }
 234                 av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
 235                 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);
 236
 237                 return -1;
 238             }
 239
 240             MPV_decode_mb(s, s->block);
 241             if(s->loop_filter)
 242                 ff_h263_loop_filter(s);
 243         }
 244
 245         ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
 246
 247         s->mb_x= 0;
 248     }
 249
 250     assert(s->mb_x==0 && s->mb_y==s->mb_height);
 251
 252     /* try to detect the padding bug */
 253     if(      s->codec_id==CODEC_ID_MPEG4
 254        &&   (s->workaround_bugs&FF_BUG_AUTODETECT)
 255        &&    s->gb.size_in_bits - get_bits_count(&s->gb) >=0
 256        &&    s->gb.size_in_bits - get_bits_count(&s->gb) < 48
 257 //       &&   !s->resync_marker
 258        &&   !s->data_partitioning){
 259
 260         const int bits_count= get_bits_count(&s->gb);
 261         const int bits_left = s->gb.size_in_bits - bits_count;
 262
 263         if(bits_left==0){
 264             s->padding_bug_score+=16;
 265         } else if(bits_left != 1){
 266             int v= show_bits(&s->gb, 8);
 267             v|= 0x7F >> (7-(bits_count&7));
 268
 269             if(v==0x7F && bits_left<=8)
 270                 s->padding_bug_score--;
 271             else if(v==0x7F && ((get_bits_count(&s->gb)+8)&8) && bits_left<=16)
 272                 s->padding_bug_score+= 4;
 273             else
 274                 s->padding_bug_score++;
 275         }
 276     }
 277
 278     if(s->workaround_bugs&FF_BUG_AUTODETECT){
 279         if(s->padding_bug_score > -2 && !s->data_partitioning /*&& (s->divx_version || !s->resync_marker)*/)
 280             s->workaround_bugs |=  FF_BUG_NO_PADDING;
 281         else
 282             s->workaround_bugs &= ~FF_BUG_NO_PADDING;
 283     }
 284
 285     // handle formats which don't have unique end markers
 286     if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
 287         int left= s->gb.size_in_bits - get_bits_count(&s->gb);
 288         int max_extra=7;
 289
 290         /* no markers in M$ crap */
 291         if(s->msmpeg4_version && s->pict_type==I_TYPE)
 292             max_extra+= 17;
 293
 294         /* buggy padding but the frame should still end approximately at the bitstream end */
 295         if((s->workaround_bugs&FF_BUG_NO_PADDING) && s->error_resilience>=3)
 296             max_extra+= 48;
 297         else if((s->workaround_bugs&FF_BUG_NO_PADDING))
 298             max_extra+= 256*256*256*64;
 299
 300         if(left>max_extra){
 301             av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
 302         }
 303         else if(left<0){
 304             av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
 305         }else
 306             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);
 307
 308         return 0;
 309     }
 310
 311     av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
 312             s->gb.size_in_bits - get_bits_count(&s->gb),
 313             show_bits(&s->gb, 24), s->padding_bug_score);
 314
 315     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);
 316
 317     return -1;
 318 }
 319
 320 /**
 321  * finds the end of the current frame in the bitstream.
 322  * @return the position of the first byte of the next frame, or -1
 323  */
 324 int ff_mpeg4_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size){
 325     int vop_found, i;
 326     uint32_t state;
 327
 328     vop_found= pc->frame_start_found;
 329     state= pc->state;
 330
 331     i=0;
 332     if(!vop_found){
 333         for(i=0; i<buf_size; i++){
 334             state= (state<<8) | buf[i];
 335             if(state == 0x1B6){
 336                 i++;
 337                 vop_found=1;
 338                 break;
 339             }
 340         }
 341     }
 342
 343     if(vop_found){
 344         /* EOF considered as end of frame */
 345         if (buf_size == 0)
 346             return 0;
 347         for(; i<buf_size; i++){
 348             state= (state<<8) | buf[i];
 349             if((state&0xFFFFFF00) == 0x100){
 350                 pc->frame_start_found=0;
 351                 pc->state=-1;
 352                 return i-3;
 353             }
 354         }
 355     }
 356     pc->frame_start_found= vop_found;
 357     pc->state= state;
 358     return END_NOT_FOUND;
 359 }
 360
 361 static int h263_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size){
 362     int vop_found, i;
 363     uint32_t state;
 364
 365     vop_found= pc->frame_start_found;
 366     state= pc->state;
 367
 368     i=0;
 369     if(!vop_found){
 370         for(i=0; i<buf_size; i++){
 371             state= (state<<8) | buf[i];
 372             if(state>>(32-22) == 0x20){
 373                 i++;
 374                 vop_found=1;
 375                 break;
 376             }
 377         }
 378     }
 379
 380     if(vop_found){
 381       for(; i<buf_size; i++){
 382         state= (state<<8) | buf[i];
 383         if(state>>(32-22) == 0x20){
 384             pc->frame_start_found=0;
 385             pc->state=-1;
 386             return i-3;
 387         }
 388       }
 389     }
 390     pc->frame_start_found= vop_found;
 391     pc->state= state;
 392
 393     return END_NOT_FOUND;
 394 }
 395
 396 #ifdef CONFIG_H263_PARSER
 397 static int h263_parse(AVCodecParserContext *s,
 398                            AVCodecContext *avctx,
 399                            const uint8_t **poutbuf, int *poutbuf_size,
 400                            const uint8_t *buf, int buf_size)
 401 {
 402     ParseContext *pc = s->priv_data;
 403     int next;
 404
 405     next= h263_find_frame_end(pc, buf, buf_size);
 406
 407     if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
 408         *poutbuf = NULL;
 409         *poutbuf_size = 0;
 410         return buf_size;
 411     }
 412
 413     *poutbuf = buf;
 414     *poutbuf_size = buf_size;
 415     return next;
 416 }
 417 #endif
 418
 419 int ff_h263_decode_frame(AVCodecContext *avctx,
 420                              void *data, int *data_size,
 421                              uint8_t *buf, int buf_size)
 422 {
 423     MpegEncContext *s = avctx->priv_data;
 424     int ret;
 425     AVFrame *pict = data;
 426
 427 #ifdef PRINT_FRAME_TIME
 428 uint64_t time= rdtsc();
 429 #endif
 430 #ifdef DEBUG
 431     av_log(avctx, AV_LOG_DEBUG, "*****frame %d size=%d\n", avctx->frame_number, buf_size);
 432     if(buf_size>0)
 433         av_log(avctx, AV_LOG_DEBUG, "bytes=%x %x %x %x\n", buf[0], buf[1], buf[2], buf[3]);
 434 #endif
 435     s->flags= avctx->flags;
 436     s->flags2= avctx->flags2;
 437
 438     /* no supplementary picture */
 439     if (buf_size == 0) {
 440         /* special case for last picture */
 441         if (s->low_delay==0 && s->next_picture_ptr) {
 442             *pict= *(AVFrame*)s->next_picture_ptr;
 443             s->next_picture_ptr= NULL;
 444
 445             *data_size = sizeof(AVFrame);
 446         }
 447
 448         return 0;
 449     }
 450
 451     if(s->flags&CODEC_FLAG_TRUNCATED){
 452         int next;
 453
 454         if(s->codec_id==CODEC_ID_MPEG4){
 455             next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
 456         }else if(s->codec_id==CODEC_ID_H263){
 457             next= h263_find_frame_end(&s->parse_context, buf, buf_size);
 458         }else{
 459             av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n");
 460             return -1;
 461         }
 462
 463         if( ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
 464             return buf_size;
 465     }
 466
 467
 468 retry:
 469
 470     if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
 471         init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
 472     }else
 473         init_get_bits(&s->gb, buf, buf_size*8);
 474     s->bitstream_buffer_size=0;
 475
 476     if (!s->context_initialized) {
 477         if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
 478             return -1;
 479     }
 480
 481     //we need to set current_picture_ptr before reading the header, otherwise we cant store anyting im there
 482     if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){
 483         int i= ff_find_unused_picture(s, 0);
 484         s->current_picture_ptr= &s->picture[i];
 485     }
 486
 487     /* let's go :-) */
 488     if (s->msmpeg4_version==5) {
 489         ret= ff_wmv2_decode_picture_header(s);
 490     } else if (s->msmpeg4_version) {
 491         ret = msmpeg4_decode_picture_header(s);
 492     } else if (s->h263_pred) {
 493         if(s->avctx->extradata_size && s->picture_number==0){
 494             GetBitContext gb;
 495
 496             init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
 497             ret = ff_mpeg4_decode_picture_header(s, &gb);
 498         }
 499         ret = ff_mpeg4_decode_picture_header(s, &s->gb);
 500
 501         if(s->flags& CODEC_FLAG_LOW_DELAY)
 502             s->low_delay=1;
 503     } else if (s->codec_id == CODEC_ID_H263I) {
 504         ret = intel_h263_decode_picture_header(s);
 505     } else if (s->h263_flv) {
 506         ret = flv_h263_decode_picture_header(s);
 507     } else {
 508         ret = h263_decode_picture_header(s);
 509     }
 510
 511     if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size);
 512
 513     /* skip if the header was thrashed */
 514     if (ret < 0){
 515         av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
 516         return -1;
 517     }
 518
 519     avctx->has_b_frames= !s->low_delay;
 520
 521     if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
 522         if(s->stream_codec_tag == ff_get_fourcc("XVID") ||
 523            s->codec_tag == ff_get_fourcc("XVID") || s->codec_tag == ff_get_fourcc("XVIX") ||
 524            s->codec_tag == ff_get_fourcc("RMP4"))
 525             s->xvid_build= -1;
 526 #if 0
 527         if(s->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
 528            && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
 529             s->xvid_build= -1;
 530 #endif
 531     }
 532
 533     if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
 534         if(s->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
 535             s->divx_version= 400; //divx 4
 536     }
 537
 538     if(s->xvid_build && s->divx_version){
 539         s->divx_version=
 540         s->divx_build= 0;
 541     }
 542
 543     if(s->workaround_bugs&FF_BUG_AUTODETECT){
 544         if(s->codec_tag == ff_get_fourcc("XVIX"))
 545             s->workaround_bugs|= FF_BUG_XVID_ILACE;
 546
 547         if(s->codec_tag == ff_get_fourcc("UMP4")){
 548             s->workaround_bugs|= FF_BUG_UMP4;
 549         }
 550
 551         if(s->divx_version>=500){
 552             s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
 553         }
 554
 555         if(s->divx_version>502){
 556             s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
 557         }
 558
 559         if(s->xvid_build && s->xvid_build<=3)
 560             s->padding_bug_score= 256*256*256*64;
 561
 562         if(s->xvid_build && s->xvid_build<=1)
 563             s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
 564
 565         if(s->xvid_build && s->xvid_build<=12)
 566             s->workaround_bugs|= FF_BUG_EDGE;
 567
 568         if(s->xvid_build && s->xvid_build<=32)
 569             s->workaround_bugs|= FF_BUG_DC_CLIP;
 570
 571 #define SET_QPEL_FUNC(postfix1, postfix2) \
 572     s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
 573     s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
 574     s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
 575
 576         if(s->lavc_build && s->lavc_build<4653)
 577             s->workaround_bugs|= FF_BUG_STD_QPEL;
 578
 579         if(s->lavc_build && s->lavc_build<4655)
 580             s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
 581
 582         if(s->lavc_build && s->lavc_build<4670){
 583             s->workaround_bugs|= FF_BUG_EDGE;
 584         }
 585
 586         if(s->lavc_build && s->lavc_build<=4712)
 587             s->workaround_bugs|= FF_BUG_DC_CLIP;
 588
 589         if(s->divx_version)
 590             s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
 591 //printf("padding_bug_score: %d\n", s->padding_bug_score);
 592         if(s->divx_version==501 && s->divx_build==20020416)
 593             s->padding_bug_score= 256*256*256*64;
 594
 595         if(s->divx_version && s->divx_version<500){
 596             s->workaround_bugs|= FF_BUG_EDGE;
 597         }
 598
 599         if(s->divx_version)
 600             s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
 601 #if 0
 602         if(s->divx_version==500)
 603             s->padding_bug_score= 256*256*256*64;
 604
 605         /* very ugly XVID padding bug detection FIXME/XXX solve this differently
 606          * lets hope this at least works
 607          */
 608         if(   s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==0
 609            && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
 610             s->workaround_bugs|= FF_BUG_NO_PADDING;
 611
 612         if(s->lavc_build && s->lavc_build<4609) //FIXME not sure about the version num but a 4609 file seems ok
 613             s->workaround_bugs|= FF_BUG_NO_PADDING;
 614 #endif
 615     }
 616
 617     if(s->workaround_bugs& FF_BUG_STD_QPEL){
 618         SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
 619         SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
 620         SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
 621         SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
 622         SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
 623         SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
 624
 625         SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
 626         SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
 627         SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
 628         SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
 629         SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
 630         SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
 631     }
 632
 633     if(avctx->debug & FF_DEBUG_BUGS)
 634         av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
 635                s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
 636                s->divx_packed ? "p" : "");
 637
 638 #if 0 // dump bits per frame / qp / complexity
 639 {
 640     static FILE *f=NULL;
 641     if(!f) f=fopen("rate_qp_cplx.txt", "w");
 642     fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
 643 }
 644 #endif
 645
 646 #if defined(HAVE_MMX) && defined(CONFIG_GPL)
 647     if(s->codec_id == CODEC_ID_MPEG4 && s->xvid_build && avctx->idct_algo == FF_IDCT_AUTO && (mm_flags & MM_MMX)){
 648         avctx->idct_algo= FF_IDCT_XVIDMMX;
 649         avctx->coded_width= 0; // force reinit
 650 //        dsputil_init(&s->dsp, avctx);
 651         s->picture_number=0;
 652     }
 653 #endif
 654
 655         /* After H263 & mpeg4 header decode we have the height, width,*/
 656         /* and other parameters. So then we could init the picture   */
 657         /* FIXME: By the way H263 decoder is evolving it should have */
 658         /* an H263EncContext                                         */
 659
 660     if (   s->width  != avctx->coded_width
 661         || s->height != avctx->coded_height) {
 662         /* H.263 could change picture size any time */
 663         ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
 664         s->parse_context.buffer=0;
 665         MPV_common_end(s);
 666         s->parse_context= pc;
 667     }
 668     if (!s->context_initialized) {
 669         avcodec_set_dimensions(avctx, s->width, s->height);
 670
 671         goto retry;
 672     }
 673
 674     if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P))
 675         s->gob_index = ff_h263_get_gob_height(s);
 676
 677     // for hurry_up==5
 678     s->current_picture.pict_type= s->pict_type;
 679     s->current_picture.key_frame= s->pict_type == I_TYPE;
 680
 681     /* skip B-frames if we don't have reference frames */
 682     if(s->last_picture_ptr==NULL && (s->pict_type==B_TYPE || s->dropable)) return get_consumed_bytes(s, buf_size);
 683     /* skip b frames if we are in a hurry */
 684     if(avctx->hurry_up && s->pict_type==B_TYPE) return get_consumed_bytes(s, buf_size);
 685     if(   (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==B_TYPE)
 686        || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=I_TYPE)
 687        ||  avctx->skip_frame >= AVDISCARD_ALL)
 688         return get_consumed_bytes(s, buf_size);
 689     /* skip everything if we are in a hurry>=5 */
 690     if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
 691
 692     if(s->next_p_frame_damaged){
 693         if(s->pict_type==B_TYPE)
 694             return get_consumed_bytes(s, buf_size);
 695         else
 696             s->next_p_frame_damaged=0;
 697     }
 698
 699     if((s->avctx->flags2 & CODEC_FLAG2_FAST) && s->pict_type==B_TYPE){
 700         s->me.qpel_put= s->dsp.put_2tap_qpel_pixels_tab;
 701         s->me.qpel_avg= s->dsp.avg_2tap_qpel_pixels_tab;
 702     }else if((!s->no_rounding) || s->pict_type==B_TYPE){
 703         s->me.qpel_put= s->dsp.put_qpel_pixels_tab;
 704         s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
 705     }else{
 706         s->me.qpel_put= s->dsp.put_no_rnd_qpel_pixels_tab;
 707         s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
 708     }
 709
 710     if(MPV_frame_start(s, avctx) < 0)
 711         return -1;
 712
 713 #ifdef DEBUG
 714     av_log(avctx, AV_LOG_DEBUG, "qscale=%d\n", s->qscale);
 715 #endif
 716
 717     ff_er_frame_start(s);
 718
 719     //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
 720     //which isnt available before MPV_frame_start()
 721     if (s->msmpeg4_version==5){
 722         if(ff_wmv2_decode_secondary_picture_header(s) < 0)
 723             return -1;
 724     }
 725
 726     /* decode each macroblock */
 727     s->mb_x=0;
 728     s->mb_y=0;
 729
 730     decode_slice(s);
 731     while(s->mb_y<s->mb_height){
 732         if(s->msmpeg4_version){
 733             if(s->slice_height==0 || s->mb_x!=0 || (s->mb_y%s->slice_height)!=0 || get_bits_count(&s->gb) > s->gb.size_in_bits)
 734                 break;
 735         }else{
 736             if(ff_h263_resync(s)<0)
 737                 break;
 738         }
 739
 740         if(s->msmpeg4_version<4 && s->h263_pred)
 741             ff_mpeg4_clean_buffers(s);
 742
 743         decode_slice(s);
 744     }
 745
 746     if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==I_TYPE)
 747         if(msmpeg4_decode_ext_header(s, buf_size) < 0){
 748             s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
 749         }
 750
 751     /* divx 5.01+ bistream reorder stuff */
 752     if(s->codec_id==CODEC_ID_MPEG4 && s->bitstream_buffer_size==0 && s->divx_packed){
 753         int current_pos= get_bits_count(&s->gb)>>3;
 754         int startcode_found=0;
 755
 756         if(buf_size - current_pos > 5){
 757             int i;
 758             for(i=current_pos; i<buf_size-3; i++){
 759                 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
 760                     startcode_found=1;
 761                     break;
 762                 }
 763             }
 764         }
 765         if(s->gb.buffer == s->bitstream_buffer && buf_size>20){ //xvid style
 766             startcode_found=1;
 767             current_pos=0;
 768         }
 769
 770         if(startcode_found){
 771             s->bitstream_buffer= av_fast_realloc(
 772                 s->bitstream_buffer,
 773                 &s->allocated_bitstream_buffer_size,
 774                 buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
 775             memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
 776             s->bitstream_buffer_size= buf_size - current_pos;
 777         }
 778     }
 779
 780     ff_er_frame_end(s);
 781
 782     MPV_frame_end(s);
 783
 784 assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);
 785 assert(s->current_picture.pict_type == s->pict_type);
 786     if (s->pict_type == B_TYPE || s->low_delay) {
 787         *pict= *(AVFrame*)s->current_picture_ptr;
 788     } else if (s->last_picture_ptr != NULL) {
 789         *pict= *(AVFrame*)s->last_picture_ptr;
 790     }
 791
 792     if(s->last_picture_ptr || s->low_delay){
 793         *data_size = sizeof(AVFrame);
 794         ff_print_debug_info(s, pict);
 795     }
 796
 797     /* Return the Picture timestamp as the frame number */
 798     /* we substract 1 because it is added on utils.c    */
 799     avctx->frame_number = s->picture_number - 1;
 800
 801 #ifdef PRINT_FRAME_TIME
 802 av_log(avctx, AV_LOG_DEBUG, "%"PRId64"\n", rdtsc()-time);
 803 #endif
 804
 805     return get_consumed_bytes(s, buf_size);
 806 }
 807
 808 AVCodec mpeg4_decoder = {
 809     "mpeg4",
 810     CODEC_TYPE_VIDEO,
 811     CODEC_ID_MPEG4,
 812     sizeof(MpegEncContext),
 813     ff_h263_decode_init,
 814     NULL,
 815     ff_h263_decode_end,
 816     ff_h263_decode_frame,
 817     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
 818     .flush= ff_mpeg_flush,
 819 };
 820
 821 AVCodec h263_decoder = {
 822     "h263",
 823     CODEC_TYPE_VIDEO,
 824     CODEC_ID_H263,
 825     sizeof(MpegEncContext),
 826     ff_h263_decode_init,
 827     NULL,
 828     ff_h263_decode_end,
 829     ff_h263_decode_frame,
 830     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
 831     .flush= ff_mpeg_flush,
 832 };
 833
 834 AVCodec msmpeg4v1_decoder = {
 835     "msmpeg4v1",
 836     CODEC_TYPE_VIDEO,
 837     CODEC_ID_MSMPEG4V1,
 838     sizeof(MpegEncContext),
 839     ff_h263_decode_init,
 840     NULL,
 841     ff_h263_decode_end,
 842     ff_h263_decode_frame,
 843     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 844 };
 845
 846 AVCodec msmpeg4v2_decoder = {
 847     "msmpeg4v2",
 848     CODEC_TYPE_VIDEO,
 849     CODEC_ID_MSMPEG4V2,
 850     sizeof(MpegEncContext),
 851     ff_h263_decode_init,
 852     NULL,
 853     ff_h263_decode_end,
 854     ff_h263_decode_frame,
 855     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 856 };
 857
 858 AVCodec msmpeg4v3_decoder = {
 859     "msmpeg4",
 860     CODEC_TYPE_VIDEO,
 861     CODEC_ID_MSMPEG4V3,
 862     sizeof(MpegEncContext),
 863     ff_h263_decode_init,
 864     NULL,
 865     ff_h263_decode_end,
 866     ff_h263_decode_frame,
 867     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 868 };
 869
 870 AVCodec wmv1_decoder = {
 871     "wmv1",
 872     CODEC_TYPE_VIDEO,
 873     CODEC_ID_WMV1,
 874     sizeof(MpegEncContext),
 875     ff_h263_decode_init,
 876     NULL,
 877     ff_h263_decode_end,
 878     ff_h263_decode_frame,
 879     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 880 };
 881
 882 AVCodec h263i_decoder = {
 883     "h263i",
 884     CODEC_TYPE_VIDEO,
 885     CODEC_ID_H263I,
 886     sizeof(MpegEncContext),
 887     ff_h263_decode_init,
 888     NULL,
 889     ff_h263_decode_end,
 890     ff_h263_decode_frame,
 891     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 892 };
 893
 894 AVCodec flv_decoder = {
 895     "flv",
 896     CODEC_TYPE_VIDEO,
 897     CODEC_ID_FLV1,
 898     sizeof(MpegEncContext),
 899     ff_h263_decode_init,
 900     NULL,
 901     ff_h263_decode_end,
 902     ff_h263_decode_frame,
 903     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1
 904 };
 905
 906 #ifdef CONFIG_H263_PARSER
 907 AVCodecParser h263_parser = {
 908     { CODEC_ID_H263 },
 909     sizeof(ParseContext),
 910     NULL,
 911     h263_parse,
 912     ff_parse_close,
 913 };
 914 #endif