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 libavcodec/h263dec.c
  25  * H.263 decoder.
  26  */
  27
  28 #include "internal.h"
  29 #include "avcodec.h"
  30 #include "dsputil.h"
  31 #include "mpegvideo.h"
  32 #include "h263_parser.h"
  33 #include "mpeg4video_parser.h"
  34 #include "msmpeg4.h"
  35
  36 //#define DEBUG
  37 //#define PRINT_FRAME_TIME
  38
  39 av_cold int ff_h263_decode_init(AVCodecContext *avctx)
  40 {
  41     MpegEncContext *s = avctx->priv_data;
  42
  43     s->avctx = avctx;
  44     s->out_format = FMT_H263;
  45
  46     s->width  = avctx->coded_width;
  47     s->height = avctx->coded_height;
  48     s->workaround_bugs= avctx->workaround_bugs;
  49
  50     // set defaults
  51     MPV_decode_defaults(s);
  52     s->quant_precision=5;
  53     s->decode_mb= ff_h263_decode_mb;
  54     s->low_delay= 1;
  55     avctx->pix_fmt= avctx->get_format(avctx, avctx->codec->pix_fmts);
  56     s->unrestricted_mv= 1;
  57
  58     /* select sub codec */
  59     switch(avctx->codec->id) {
  60     case CODEC_ID_H263:
  61         s->unrestricted_mv= 0;
  62         break;
  63     case CODEC_ID_MPEG4:
  64         s->decode_mb= ff_mpeg4_decode_mb;
  65         s->time_increment_bits = 4; /* default value for broken headers */
  66         s->h263_pred = 1;
  67         s->low_delay = 0; //default, might be overriden in the vol header during header parsing
  68         break;
  69     case CODEC_ID_MSMPEG4V1:
  70         s->h263_msmpeg4 = 1;
  71         s->h263_pred = 1;
  72         s->msmpeg4_version=1;
  73         break;
  74     case CODEC_ID_MSMPEG4V2:
  75         s->h263_msmpeg4 = 1;
  76         s->h263_pred = 1;
  77         s->msmpeg4_version=2;
  78         break;
  79     case CODEC_ID_MSMPEG4V3:
  80         s->h263_msmpeg4 = 1;
  81         s->h263_pred = 1;
  82         s->msmpeg4_version=3;
  83         break;
  84     case CODEC_ID_WMV1:
  85         s->h263_msmpeg4 = 1;
  86         s->h263_pred = 1;
  87         s->msmpeg4_version=4;
  88         break;
  89     case CODEC_ID_WMV2:
  90         s->h263_msmpeg4 = 1;
  91         s->h263_pred = 1;
  92         s->msmpeg4_version=5;
  93         break;
  94     case CODEC_ID_VC1:
  95     case CODEC_ID_WMV3:
  96         s->h263_msmpeg4 = 1;
  97         s->h263_pred = 1;
  98         s->msmpeg4_version=6;
  99         break;
 100     case CODEC_ID_H263I:
 101         break;
 102     case CODEC_ID_FLV1:
 103         s->h263_flv = 1;
 104         break;
 105     default:
 106         return -1;
 107     }
 108     s->codec_id= avctx->codec->id;
 109     avctx->hwaccel= ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
 110
 111     /* for h263, we allocate the images after having read the header */
 112     if (avctx->codec->id != CODEC_ID_H263 && avctx->codec->id != CODEC_ID_MPEG4)
 113         if (MPV_common_init(s) < 0)
 114             return -1;
 115
 116     if (CONFIG_MSMPEG4_DECODER && s->h263_msmpeg4)
 117         ff_msmpeg4_decode_init(s);
 118     else
 119         h263_decode_init_vlc(s);
 120
 121     return 0;
 122 }
 123
 124 av_cold int ff_h263_decode_end(AVCodecContext *avctx)
 125 {
 126     MpegEncContext *s = avctx->priv_data;
 127
 128     MPV_common_end(s);
 129     return 0;
 130 }
 131
 132 /**
 133  * returns the number of bytes consumed for building the current frame
 134  */
 135 static int get_consumed_bytes(MpegEncContext *s, int buf_size){
 136     int pos= (get_bits_count(&s->gb)+7)>>3;
 137
 138     if(s->divx_packed || s->avctx->hwaccel){
 139         //we would have to scan through the whole buf to handle the weird reordering ...
 140         return buf_size;
 141     }else if(s->flags&CODEC_FLAG_TRUNCATED){
 142         pos -= s->parse_context.last_index;
 143         if(pos<0) pos=0; // padding is not really read so this might be -1
 144         return pos;
 145     }else{
 146         if(pos==0) pos=1; //avoid infinite loops (i doubt that is needed but ...)
 147         if(pos+10>buf_size) pos=buf_size; // oops ;)
 148
 149         return pos;
 150     }
 151 }
 152
 153 static int decode_slice(MpegEncContext *s){
 154     const int part_mask= s->partitioned_frame ? (AC_END|AC_ERROR) : 0x7F;
 155     const int mb_size= 16>>s->avctx->lowres;
 156     s->last_resync_gb= s->gb;
 157     s->first_slice_line= 1;
 158
 159     s->resync_mb_x= s->mb_x;
 160     s->resync_mb_y= s->mb_y;
 161
 162     ff_set_qscale(s, s->qscale);
 163
 164     if (s->avctx->hwaccel) {
 165         const uint8_t *start= s->gb.buffer + get_bits_count(&s->gb)/8;
 166         const uint8_t *end  = ff_h263_find_resync_marker(start + 1, s->gb.buffer_end);
 167         skip_bits_long(&s->gb, 8*(end - start));
 168         return s->avctx->hwaccel->decode_slice(s->avctx, start, end - start);
 169     }
 170
 171     if(s->partitioned_frame){
 172         const int qscale= s->qscale;
 173
 174         if(s->codec_id==CODEC_ID_MPEG4){
 175             if(ff_mpeg4_decode_partitions(s) < 0)
 176                 return -1;
 177         }
 178
 179         /* restore variables which were modified */
 180         s->first_slice_line=1;
 181         s->mb_x= s->resync_mb_x;
 182         s->mb_y= s->resync_mb_y;
 183         ff_set_qscale(s, qscale);
 184     }
 185
 186     for(; s->mb_y < s->mb_height; s->mb_y++) {
 187         /* per-row end of slice checks */
 188         if(s->msmpeg4_version){
 189             if(s->resync_mb_y + s->slice_height == s->mb_y){
 190                 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);
 191
 192                 return 0;
 193             }
 194         }
 195
 196         if(s->msmpeg4_version==1){
 197             s->last_dc[0]=
 198             s->last_dc[1]=
 199             s->last_dc[2]= 128;
 200         }
 201
 202         ff_init_block_index(s);
 203         for(; s->mb_x < s->mb_width; s->mb_x++) {
 204             int ret;
 205
 206             ff_update_block_index(s);
 207
 208             if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
 209                 s->first_slice_line=0;
 210             }
 211
 212             /* DCT & quantize */
 213
 214             s->mv_dir = MV_DIR_FORWARD;
 215             s->mv_type = MV_TYPE_16X16;
 216 //            s->mb_skipped = 0;
 217 //printf("%d %d %06X\n", ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
 218             ret= s->decode_mb(s, s->block);
 219
 220             if (s->pict_type!=FF_B_TYPE)
 221                 ff_h263_update_motion_val(s);
 222
 223             if(ret<0){
 224                 const int xy= s->mb_x + s->mb_y*s->mb_stride;
 225                 if(ret==SLICE_END){
 226                     MPV_decode_mb(s, s->block);
 227                     if(s->loop_filter)
 228                         ff_h263_loop_filter(s);
 229
 230 //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));
 231                     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);
 232
 233                     s->padding_bug_score--;
 234
 235                     if(++s->mb_x >= s->mb_width){
 236                         s->mb_x=0;
 237                         ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
 238                         s->mb_y++;
 239                     }
 240                     return 0;
 241                 }else if(ret==SLICE_NOEND){
 242                     av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy);
 243                     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);
 244                     return -1;
 245                 }
 246                 av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
 247                 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);
 248
 249                 return -1;
 250             }
 251
 252             MPV_decode_mb(s, s->block);
 253             if(s->loop_filter)
 254                 ff_h263_loop_filter(s);
 255         }
 256
 257         ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
 258
 259         s->mb_x= 0;
 260     }
 261
 262     assert(s->mb_x==0 && s->mb_y==s->mb_height);
 263
 264     /* try to detect the padding bug */
 265     if(      s->codec_id==CODEC_ID_MPEG4
 266        &&   (s->workaround_bugs&FF_BUG_AUTODETECT)
 267        &&    s->gb.size_in_bits - get_bits_count(&s->gb) >=0
 268        &&    s->gb.size_in_bits - get_bits_count(&s->gb) < 48
 269 //       &&   !s->resync_marker
 270        &&   !s->data_partitioning){
 271
 272         const int bits_count= get_bits_count(&s->gb);
 273         const int bits_left = s->gb.size_in_bits - bits_count;
 274
 275         if(bits_left==0){
 276             s->padding_bug_score+=16;
 277         } else if(bits_left != 1){
 278             int v= show_bits(&s->gb, 8);
 279             v|= 0x7F >> (7-(bits_count&7));
 280
 281             if(v==0x7F && bits_left<=8)
 282                 s->padding_bug_score--;
 283             else if(v==0x7F && ((get_bits_count(&s->gb)+8)&8) && bits_left<=16)
 284                 s->padding_bug_score+= 4;
 285             else
 286                 s->padding_bug_score++;
 287         }
 288     }
 289
 290     if(s->workaround_bugs&FF_BUG_AUTODETECT){
 291         if(s->padding_bug_score > -2 && !s->data_partitioning /*&& (s->divx_version || !s->resync_marker)*/)
 292             s->workaround_bugs |=  FF_BUG_NO_PADDING;
 293         else
 294             s->workaround_bugs &= ~FF_BUG_NO_PADDING;
 295     }
 296
 297     // handle formats which don't have unique end markers
 298     if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
 299         int left= s->gb.size_in_bits - get_bits_count(&s->gb);
 300         int max_extra=7;
 301
 302         /* no markers in M$ crap */
 303         if(s->msmpeg4_version && s->pict_type==FF_I_TYPE)
 304             max_extra+= 17;
 305
 306         /* buggy padding but the frame should still end approximately at the bitstream end */
 307         if((s->workaround_bugs&FF_BUG_NO_PADDING) && s->error_recognition>=3)
 308             max_extra+= 48;
 309         else if((s->workaround_bugs&FF_BUG_NO_PADDING))
 310             max_extra+= 256*256*256*64;
 311
 312         if(left>max_extra){
 313             av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
 314         }
 315         else if(left<0){
 316             av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
 317         }else
 318             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);
 319
 320         return 0;
 321     }
 322
 323     av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
 324             s->gb.size_in_bits - get_bits_count(&s->gb),
 325             show_bits(&s->gb, 24), s->padding_bug_score);
 326
 327     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);
 328
 329     return -1;
 330 }
 331
 332 int ff_h263_decode_frame(AVCodecContext *avctx,
 333                              void *data, int *data_size,
 334                              AVPacket *avpkt)
 335 {
 336     const uint8_t *buf = avpkt->data;
 337     int buf_size = avpkt->size;
 338     MpegEncContext *s = avctx->priv_data;
 339     int ret;
 340     AVFrame *pict = data;
 341
 342 #ifdef PRINT_FRAME_TIME
 343 uint64_t time= rdtsc();
 344 #endif
 345 #ifdef DEBUG
 346     av_log(avctx, AV_LOG_DEBUG, "*****frame %d size=%d\n", avctx->frame_number, buf_size);
 347     if(buf_size>0)
 348         av_log(avctx, AV_LOG_DEBUG, "bytes=%x %x %x %x\n", buf[0], buf[1], buf[2], buf[3]);
 349 #endif
 350     s->flags= avctx->flags;
 351     s->flags2= avctx->flags2;
 352
 353     /* no supplementary picture */
 354     if (buf_size == 0) {
 355         /* special case for last picture */
 356         if (s->low_delay==0 && s->next_picture_ptr) {
 357             *pict= *(AVFrame*)s->next_picture_ptr;
 358             s->next_picture_ptr= NULL;
 359
 360             *data_size = sizeof(AVFrame);
 361         }
 362
 363         return 0;
 364     }
 365
 366     if(s->flags&CODEC_FLAG_TRUNCATED){
 367         int next;
 368
 369         if(CONFIG_MPEG4_DECODER && s->codec_id==CODEC_ID_MPEG4){
 370             next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
 371         }else if(CONFIG_H263_DECODER && s->codec_id==CODEC_ID_H263){
 372             next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
 373         }else{
 374             av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n");
 375             return -1;
 376         }
 377
 378         if( ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
 379             return buf_size;
 380     }
 381
 382
 383 retry:
 384
 385     if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
 386         init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
 387     }else
 388         init_get_bits(&s->gb, buf, buf_size*8);
 389     s->bitstream_buffer_size=0;
 390
 391     if (!s->context_initialized) {
 392         if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
 393             return -1;
 394     }
 395
 396     /* We need to set current_picture_ptr before reading the header,
 397      * otherwise we cannot store anyting in there */
 398     if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){
 399         int i= ff_find_unused_picture(s, 0);
 400         s->current_picture_ptr= &s->picture[i];
 401     }
 402
 403     /* let's go :-) */
 404     if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5) {
 405         ret= ff_wmv2_decode_picture_header(s);
 406     } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
 407         ret = msmpeg4_decode_picture_header(s);
 408     } else if (s->h263_pred) {
 409         if(s->avctx->extradata_size && s->picture_number==0){
 410             GetBitContext gb;
 411
 412             init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
 413             ret = ff_mpeg4_decode_picture_header(s, &gb);
 414         }
 415         ret = ff_mpeg4_decode_picture_header(s, &s->gb);
 416     } else if (s->codec_id == CODEC_ID_H263I) {
 417         ret = intel_h263_decode_picture_header(s);
 418     } else if (s->h263_flv) {
 419         ret = flv_h263_decode_picture_header(s);
 420     } else {
 421         ret = h263_decode_picture_header(s);
 422     }
 423
 424     if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size);
 425
 426     /* skip if the header was thrashed */
 427     if (ret < 0){
 428         av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
 429         return -1;
 430     }
 431
 432     avctx->has_b_frames= !s->low_delay;
 433
 434     if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
 435         if(s->stream_codec_tag == AV_RL32("XVID") ||
 436            s->codec_tag == AV_RL32("XVID") || s->codec_tag == AV_RL32("XVIX") ||
 437            s->codec_tag == AV_RL32("RMP4"))
 438             s->xvid_build= -1;
 439 #if 0
 440         if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
 441            && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
 442             s->xvid_build= -1;
 443 #endif
 444     }
 445
 446     if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
 447         if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
 448             s->divx_version= 400; //divx 4
 449     }
 450
 451     if(s->xvid_build && s->divx_version){
 452         s->divx_version=
 453         s->divx_build= 0;
 454     }
 455
 456     if(s->workaround_bugs&FF_BUG_AUTODETECT){
 457         if(s->codec_tag == AV_RL32("XVIX"))
 458             s->workaround_bugs|= FF_BUG_XVID_ILACE;
 459
 460         if(s->codec_tag == AV_RL32("UMP4")){
 461             s->workaround_bugs|= FF_BUG_UMP4;
 462         }
 463
 464         if(s->divx_version>=500 && s->divx_build<1814){
 465             s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
 466         }
 467
 468         if(s->divx_version>502 && s->divx_build<1814){
 469             s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
 470         }
 471
 472         if(s->xvid_build && s->xvid_build<=3)
 473             s->padding_bug_score= 256*256*256*64;
 474
 475         if(s->xvid_build && s->xvid_build<=1)
 476             s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
 477
 478         if(s->xvid_build && s->xvid_build<=12)
 479             s->workaround_bugs|= FF_BUG_EDGE;
 480
 481         if(s->xvid_build && s->xvid_build<=32)
 482             s->workaround_bugs|= FF_BUG_DC_CLIP;
 483
 484 #define SET_QPEL_FUNC(postfix1, postfix2) \
 485     s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
 486     s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
 487     s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
 488
 489         if(s->lavc_build && s->lavc_build<4653)
 490             s->workaround_bugs|= FF_BUG_STD_QPEL;
 491
 492         if(s->lavc_build && s->lavc_build<4655)
 493             s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
 494
 495         if(s->lavc_build && s->lavc_build<4670){
 496             s->workaround_bugs|= FF_BUG_EDGE;
 497         }
 498
 499         if(s->lavc_build && s->lavc_build<=4712)
 500             s->workaround_bugs|= FF_BUG_DC_CLIP;
 501
 502         if(s->divx_version)
 503             s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
 504 //printf("padding_bug_score: %d\n", s->padding_bug_score);
 505         if(s->divx_version==501 && s->divx_build==20020416)
 506             s->padding_bug_score= 256*256*256*64;
 507
 508         if(s->divx_version && s->divx_version<500){
 509             s->workaround_bugs|= FF_BUG_EDGE;
 510         }
 511
 512         if(s->divx_version)
 513             s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
 514 #if 0
 515         if(s->divx_version==500)
 516             s->padding_bug_score= 256*256*256*64;
 517
 518         /* very ugly XVID padding bug detection FIXME/XXX solve this differently
 519          * Let us hope this at least works.
 520          */
 521         if(   s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==0
 522            && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
 523             s->workaround_bugs|= FF_BUG_NO_PADDING;
 524
 525         if(s->lavc_build && s->lavc_build<4609) //FIXME not sure about the version num but a 4609 file seems ok
 526             s->workaround_bugs|= FF_BUG_NO_PADDING;
 527 #endif
 528     }
 529
 530     if(s->workaround_bugs& FF_BUG_STD_QPEL){
 531         SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
 532         SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
 533         SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
 534         SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
 535         SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
 536         SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
 537
 538         SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
 539         SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
 540         SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
 541         SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
 542         SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
 543         SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
 544     }
 545
 546     if(avctx->debug & FF_DEBUG_BUGS)
 547         av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
 548                s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
 549                s->divx_packed ? "p" : "");
 550
 551 #if 0 // dump bits per frame / qp / complexity
 552 {
 553     static FILE *f=NULL;
 554     if(!f) f=fopen("rate_qp_cplx.txt", "w");
 555     fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
 556 }
 557 #endif
 558
 559 #if HAVE_MMX
 560     if(s->codec_id == CODEC_ID_MPEG4 && s->xvid_build && avctx->idct_algo == FF_IDCT_AUTO && (mm_flags & FF_MM_MMX)){
 561         avctx->idct_algo= FF_IDCT_XVIDMMX;
 562         avctx->coded_width= 0; // force reinit
 563 //        dsputil_init(&s->dsp, avctx);
 564         s->picture_number=0;
 565     }
 566 #endif
 567
 568         /* After H263 & mpeg4 header decode we have the height, width,*/
 569         /* and other parameters. So then we could init the picture   */
 570         /* FIXME: By the way H263 decoder is evolving it should have */
 571         /* an H263EncContext                                         */
 572
 573     if (   s->width  != avctx->coded_width
 574         || s->height != avctx->coded_height) {
 575         /* H.263 could change picture size any time */
 576         ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
 577         s->parse_context.buffer=0;
 578         MPV_common_end(s);
 579         s->parse_context= pc;
 580     }
 581     if (!s->context_initialized) {
 582         avcodec_set_dimensions(avctx, s->width, s->height);
 583
 584         goto retry;
 585     }
 586
 587     if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P || s->codec_id == CODEC_ID_H263I))
 588         s->gob_index = ff_h263_get_gob_height(s);
 589
 590     // for hurry_up==5
 591     s->current_picture.pict_type= s->pict_type;
 592     s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
 593
 594     /* skip B-frames if we don't have reference frames */
 595     if(s->last_picture_ptr==NULL && (s->pict_type==FF_B_TYPE || s->dropable)) return get_consumed_bytes(s, buf_size);
 596     /* skip b frames if we are in a hurry */
 597     if(avctx->hurry_up && s->pict_type==FF_B_TYPE) return get_consumed_bytes(s, buf_size);
 598     if(   (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==FF_B_TYPE)
 599        || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=FF_I_TYPE)
 600        ||  avctx->skip_frame >= AVDISCARD_ALL)
 601         return get_consumed_bytes(s, buf_size);
 602     /* skip everything if we are in a hurry>=5 */
 603     if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
 604
 605     if(s->next_p_frame_damaged){
 606         if(s->pict_type==FF_B_TYPE)
 607             return get_consumed_bytes(s, buf_size);
 608         else
 609             s->next_p_frame_damaged=0;
 610     }
 611
 612     if((s->avctx->flags2 & CODEC_FLAG2_FAST) && s->pict_type==FF_B_TYPE){
 613         s->me.qpel_put= s->dsp.put_2tap_qpel_pixels_tab;
 614         s->me.qpel_avg= s->dsp.avg_2tap_qpel_pixels_tab;
 615     }else if((!s->no_rounding) || s->pict_type==FF_B_TYPE){
 616         s->me.qpel_put= s->dsp.put_qpel_pixels_tab;
 617         s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
 618     }else{
 619         s->me.qpel_put= s->dsp.put_no_rnd_qpel_pixels_tab;
 620         s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
 621     }
 622
 623     if(MPV_frame_start(s, avctx) < 0)
 624         return -1;
 625
 626     if (avctx->hwaccel) {
 627         if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
 628             return -1;
 629     }
 630
 631 #ifdef DEBUG
 632     av_log(avctx, AV_LOG_DEBUG, "qscale=%d\n", s->qscale);
 633 #endif
 634
 635     ff_er_frame_start(s);
 636
 637     //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
 638     //which is not available before MPV_frame_start()
 639     if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5){
 640         ret = ff_wmv2_decode_secondary_picture_header(s);
 641         if(ret<0) return ret;
 642         if(ret==1) goto intrax8_decoded;
 643     }
 644
 645     /* decode each macroblock */
 646     s->mb_x=0;
 647     s->mb_y=0;
 648
 649     decode_slice(s);
 650     while(s->mb_y<s->mb_height){
 651         if(s->msmpeg4_version){
 652             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)
 653                 break;
 654         }else{
 655             if(ff_h263_resync(s)<0)
 656                 break;
 657         }
 658
 659         if(s->msmpeg4_version<4 && s->h263_pred)
 660             ff_mpeg4_clean_buffers(s);
 661
 662         decode_slice(s);
 663     }
 664
 665     if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==FF_I_TYPE)
 666         if(!CONFIG_MSMPEG4_DECODER || msmpeg4_decode_ext_header(s, buf_size) < 0){
 667             s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
 668         }
 669
 670     /* divx 5.01+ bistream reorder stuff */
 671     if(s->codec_id==CODEC_ID_MPEG4 && s->bitstream_buffer_size==0 && s->divx_packed){
 672         int current_pos= get_bits_count(&s->gb)>>3;
 673         int startcode_found=0;
 674
 675         if(buf_size - current_pos > 5){
 676             int i;
 677             for(i=current_pos; i<buf_size-3; i++){
 678                 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
 679                     startcode_found=1;
 680                     break;
 681                 }
 682             }
 683         }
 684         if(s->gb.buffer == s->bitstream_buffer && buf_size>20){ //xvid style
 685             startcode_found=1;
 686             current_pos=0;
 687         }
 688
 689         if(startcode_found){
 690             av_fast_malloc(
 691                 &s->bitstream_buffer,
 692                 &s->allocated_bitstream_buffer_size,
 693                 buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
 694             if (!s->bitstream_buffer)
 695                 return AVERROR(ENOMEM);
 696             memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
 697             s->bitstream_buffer_size= buf_size - current_pos;
 698         }
 699     }
 700
 701 intrax8_decoded:
 702     ff_er_frame_end(s);
 703
 704     if (avctx->hwaccel) {
 705         if (avctx->hwaccel->end_frame(avctx) < 0)
 706             return -1;
 707     }
 708
 709     MPV_frame_end(s);
 710
 711 assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);
 712 assert(s->current_picture.pict_type == s->pict_type);
 713     if (s->pict_type == FF_B_TYPE || s->low_delay) {
 714         *pict= *(AVFrame*)s->current_picture_ptr;
 715     } else if (s->last_picture_ptr != NULL) {
 716         *pict= *(AVFrame*)s->last_picture_ptr;
 717     }
 718
 719     if(s->last_picture_ptr || s->low_delay){
 720         *data_size = sizeof(AVFrame);
 721         ff_print_debug_info(s, pict);
 722     }
 723
 724     /* Return the Picture timestamp as the frame number */
 725     /* we subtract 1 because it is added on utils.c     */
 726     avctx->frame_number = s->picture_number - 1;
 727
 728 #ifdef PRINT_FRAME_TIME
 729 av_log(avctx, AV_LOG_DEBUG, "%"PRId64"\n", rdtsc()-time);
 730 #endif
 731
 732     return get_consumed_bytes(s, buf_size);
 733 }
 734
 735 AVCodec mpeg4_decoder = {
 736     "mpeg4",
 737     CODEC_TYPE_VIDEO,
 738     CODEC_ID_MPEG4,
 739     sizeof(MpegEncContext),
 740     ff_h263_decode_init,
 741     NULL,
 742     ff_h263_decode_end,
 743     ff_h263_decode_frame,
 744     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
 745     .flush= ff_mpeg_flush,
 746     .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
 747     .pix_fmts= ff_hwaccel_pixfmt_list_420,
 748 };
 749
 750 AVCodec h263_decoder = {
 751     "h263",
 752     CODEC_TYPE_VIDEO,
 753     CODEC_ID_H263,
 754     sizeof(MpegEncContext),
 755     ff_h263_decode_init,
 756     NULL,
 757     ff_h263_decode_end,
 758     ff_h263_decode_frame,
 759     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
 760     .flush= ff_mpeg_flush,
 761     .long_name= NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
 762     .pix_fmts= ff_hwaccel_pixfmt_list_420,
 763 };
 764
 765 AVCodec msmpeg4v1_decoder = {
 766     "msmpeg4v1",
 767     CODEC_TYPE_VIDEO,
 768     CODEC_ID_MSMPEG4V1,
 769     sizeof(MpegEncContext),
 770     ff_h263_decode_init,
 771     NULL,
 772     ff_h263_decode_end,
 773     ff_h263_decode_frame,
 774     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 775     .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 1"),
 776     .pix_fmts= ff_pixfmt_list_420,
 777 };
 778
 779 AVCodec msmpeg4v2_decoder = {
 780     "msmpeg4v2",
 781     CODEC_TYPE_VIDEO,
 782     CODEC_ID_MSMPEG4V2,
 783     sizeof(MpegEncContext),
 784     ff_h263_decode_init,
 785     NULL,
 786     ff_h263_decode_end,
 787     ff_h263_decode_frame,
 788     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 789     .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 2"),
 790     .pix_fmts= ff_pixfmt_list_420,
 791 };
 792
 793 AVCodec msmpeg4v3_decoder = {
 794     "msmpeg4",
 795     CODEC_TYPE_VIDEO,
 796     CODEC_ID_MSMPEG4V3,
 797     sizeof(MpegEncContext),
 798     ff_h263_decode_init,
 799     NULL,
 800     ff_h263_decode_end,
 801     ff_h263_decode_frame,
 802     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 803     .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 3"),
 804     .pix_fmts= ff_pixfmt_list_420,
 805 };
 806
 807 AVCodec wmv1_decoder = {
 808     "wmv1",
 809     CODEC_TYPE_VIDEO,
 810     CODEC_ID_WMV1,
 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     .long_name= NULL_IF_CONFIG_SMALL("Windows Media Video 7"),
 818     .pix_fmts= ff_pixfmt_list_420,
 819 };
 820
 821 AVCodec h263i_decoder = {
 822     "h263i",
 823     CODEC_TYPE_VIDEO,
 824     CODEC_ID_H263I,
 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,
 831     .long_name = NULL_IF_CONFIG_SMALL("Intel H.263"),
 832     .pix_fmts= ff_pixfmt_list_420,
 833 };
 834
 835 AVCodec flv_decoder = {
 836     "flv",
 837     CODEC_TYPE_VIDEO,
 838     CODEC_ID_FLV1,
 839     sizeof(MpegEncContext),
 840     ff_h263_decode_init,
 841     NULL,
 842     ff_h263_decode_end,
 843     ff_h263_decode_frame,
 844     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 845     .long_name= NULL_IF_CONFIG_SMALL("Flash Video (FLV)"),
 846     .pix_fmts= ff_pixfmt_list_420,
 847 };