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   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
  25  * H.263 decoder.
  26  */
  27
  28 #include "libavutil/cpu.h"
  29 #include "internal.h"
  30 #include "avcodec.h"
  31 #include "dsputil.h"
  32 #include "mpegvideo.h"
  33 #include "h263.h"
  34 #include "h263_parser.h"
  35 #include "mpeg4video_parser.h"
  36 #include "msmpeg4.h"
  37 #include "vdpau_internal.h"
  38 #include "flv.h"
  39 #include "mpeg4video.h"
  40
  41 //#define DEBUG
  42 //#define PRINT_FRAME_TIME
  43
  44 av_cold int ff_h263_decode_init(AVCodecContext *avctx)
  45 {
  46     MpegEncContext *s = avctx->priv_data;
  47
  48     s->avctx = avctx;
  49     s->out_format = FMT_H263;
  50
  51     s->width  = avctx->coded_width;
  52     s->height = avctx->coded_height;
  53     s->workaround_bugs= avctx->workaround_bugs;
  54
  55     // set defaults
  56     MPV_decode_defaults(s);
  57     s->quant_precision=5;
  58     s->decode_mb= ff_h263_decode_mb;
  59     s->low_delay= 1;
  60     avctx->pix_fmt= avctx->get_format(avctx, avctx->codec->pix_fmts);
  61     s->unrestricted_mv= 1;
  62
  63     /* select sub codec */
  64     switch(avctx->codec->id) {
  65     case CODEC_ID_H263:
  66         s->unrestricted_mv= 0;
  67         avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
  68         break;
  69     case CODEC_ID_MPEG4:
  70         break;
  71     case CODEC_ID_MSMPEG4V1:
  72         s->h263_msmpeg4 = 1;
  73         s->h263_pred = 1;
  74         s->msmpeg4_version=1;
  75         break;
  76     case CODEC_ID_MSMPEG4V2:
  77         s->h263_msmpeg4 = 1;
  78         s->h263_pred = 1;
  79         s->msmpeg4_version=2;
  80         break;
  81     case CODEC_ID_MSMPEG4V3:
  82         s->h263_msmpeg4 = 1;
  83         s->h263_pred = 1;
  84         s->msmpeg4_version=3;
  85         break;
  86     case CODEC_ID_WMV1:
  87         s->h263_msmpeg4 = 1;
  88         s->h263_pred = 1;
  89         s->msmpeg4_version=4;
  90         break;
  91     case CODEC_ID_WMV2:
  92         s->h263_msmpeg4 = 1;
  93         s->h263_pred = 1;
  94         s->msmpeg4_version=5;
  95         break;
  96     case CODEC_ID_VC1:
  97     case CODEC_ID_WMV3:
  98         s->h263_msmpeg4 = 1;
  99         s->h263_pred = 1;
 100         s->msmpeg4_version=6;
 101         avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
 102         break;
 103     case CODEC_ID_H263I:
 104         break;
 105     case CODEC_ID_FLV1:
 106         s->h263_flv = 1;
 107         break;
 108     default:
 109         return -1;
 110     }
 111     s->codec_id= avctx->codec->id;
 112     avctx->hwaccel= ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
 113
 114     /* for h263, we allocate the images after having read the header */
 115     if (avctx->codec->id != CODEC_ID_H263 && avctx->codec->id != CODEC_ID_MPEG4)
 116         if (MPV_common_init(s) < 0)
 117             return -1;
 118
 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(CONFIG_MPEG4_DECODER && 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        &&    get_bits_left(&s->gb) >=0
 268        &&    get_bits_left(&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>=0 || !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= get_bits_left(&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             get_bits_left(&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     s->flags= avctx->flags;
 346     s->flags2= avctx->flags2;
 347
 348     /* no supplementary picture */
 349     if (buf_size == 0) {
 350         /* special case for last picture */
 351         if (s->low_delay==0 && s->next_picture_ptr) {
 352             *pict= *(AVFrame*)s->next_picture_ptr;
 353             s->next_picture_ptr= NULL;
 354
 355             *data_size = sizeof(AVFrame);
 356         }
 357
 358         return 0;
 359     }
 360
 361     if(s->flags&CODEC_FLAG_TRUNCATED){
 362         int next;
 363
 364         if(CONFIG_MPEG4_DECODER && s->codec_id==CODEC_ID_MPEG4){
 365             next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
 366         }else if(CONFIG_H263_DECODER && s->codec_id==CODEC_ID_H263){
 367             next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
 368         }else{
 369             av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n");
 370             return -1;
 371         }
 372
 373         if( ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
 374             return buf_size;
 375     }
 376
 377
 378 retry:
 379
 380     if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
 381         init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
 382     }else
 383         init_get_bits(&s->gb, buf, buf_size*8);
 384     s->bitstream_buffer_size=0;
 385
 386     if (!s->context_initialized) {
 387         if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
 388             return -1;
 389     }
 390
 391     /* We need to set current_picture_ptr before reading the header,
 392      * otherwise we cannot store anyting in there */
 393     if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){
 394         int i= ff_find_unused_picture(s, 0);
 395         s->current_picture_ptr= &s->picture[i];
 396     }
 397
 398     /* let's go :-) */
 399     if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5) {
 400         ret= ff_wmv2_decode_picture_header(s);
 401     } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
 402         ret = msmpeg4_decode_picture_header(s);
 403     } else if (CONFIG_MPEG4_DECODER && s->h263_pred) {
 404         if(s->avctx->extradata_size && s->picture_number==0){
 405             GetBitContext gb;
 406
 407             init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
 408             ret = ff_mpeg4_decode_picture_header(s, &gb);
 409         }
 410         ret = ff_mpeg4_decode_picture_header(s, &s->gb);
 411     } else if (CONFIG_H263I_DECODER && s->codec_id == CODEC_ID_H263I) {
 412         ret = ff_intel_h263_decode_picture_header(s);
 413     } else if (CONFIG_FLV_DECODER && s->h263_flv) {
 414         ret = ff_flv_decode_picture_header(s);
 415     } else {
 416         ret = h263_decode_picture_header(s);
 417     }
 418
 419     if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size);
 420
 421     /* skip if the header was thrashed */
 422     if (ret < 0){
 423         av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
 424         return -1;
 425     }
 426
 427     avctx->has_b_frames= !s->low_delay;
 428
 429     if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){
 430         if(s->stream_codec_tag == AV_RL32("XVID") ||
 431            s->codec_tag == AV_RL32("XVID") || s->codec_tag == AV_RL32("XVIX") ||
 432            s->codec_tag == AV_RL32("RMP4") ||
 433            s->codec_tag == AV_RL32("SIPP")
 434            )
 435             s->xvid_build= 0;
 436 #if 0
 437         if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
 438            && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
 439             s->xvid_build= 0;
 440 #endif
 441     }
 442
 443     if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){
 444         if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
 445             s->divx_version= 400; //divx 4
 446     }
 447
 448     if(s->xvid_build>=0 && s->divx_version>=0){
 449         s->divx_version=
 450         s->divx_build= -1;
 451     }
 452
 453     if(s->workaround_bugs&FF_BUG_AUTODETECT){
 454         if(s->codec_tag == AV_RL32("XVIX"))
 455             s->workaround_bugs|= FF_BUG_XVID_ILACE;
 456
 457         if(s->codec_tag == AV_RL32("UMP4")){
 458             s->workaround_bugs|= FF_BUG_UMP4;
 459         }
 460
 461         if(s->divx_version>=500 && s->divx_build<1814){
 462             s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
 463         }
 464
 465         if(s->divx_version>502 && s->divx_build<1814){
 466             s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
 467         }
 468
 469         if(s->xvid_build<=3U)
 470             s->padding_bug_score= 256*256*256*64;
 471
 472         if(s->xvid_build<=1U)
 473             s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
 474
 475         if(s->xvid_build<=12U)
 476             s->workaround_bugs|= FF_BUG_EDGE;
 477
 478         if(s->xvid_build<=32U)
 479             s->workaround_bugs|= FF_BUG_DC_CLIP;
 480
 481 #define SET_QPEL_FUNC(postfix1, postfix2) \
 482     s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
 483     s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
 484     s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
 485
 486         if(s->lavc_build<4653U)
 487             s->workaround_bugs|= FF_BUG_STD_QPEL;
 488
 489         if(s->lavc_build<4655U)
 490             s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
 491
 492         if(s->lavc_build<4670U){
 493             s->workaround_bugs|= FF_BUG_EDGE;
 494         }
 495
 496         if(s->lavc_build<=4712U)
 497             s->workaround_bugs|= FF_BUG_DC_CLIP;
 498
 499         if(s->divx_version>=0)
 500             s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
 501 //printf("padding_bug_score: %d\n", s->padding_bug_score);
 502         if(s->divx_version==501 && s->divx_build==20020416)
 503             s->padding_bug_score= 256*256*256*64;
 504
 505         if(s->divx_version<500U){
 506             s->workaround_bugs|= FF_BUG_EDGE;
 507         }
 508
 509         if(s->divx_version>=0)
 510             s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
 511 #if 0
 512         if(s->divx_version==500)
 513             s->padding_bug_score= 256*256*256*64;
 514
 515         /* very ugly XVID padding bug detection FIXME/XXX solve this differently
 516          * Let us hope this at least works.
 517          */
 518         if(   s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==-1
 519            && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
 520             s->workaround_bugs|= FF_BUG_NO_PADDING;
 521
 522         if(s->lavc_build<4609U) //FIXME not sure about the version num but a 4609 file seems ok
 523             s->workaround_bugs|= FF_BUG_NO_PADDING;
 524 #endif
 525     }
 526
 527     if(s->workaround_bugs& FF_BUG_STD_QPEL){
 528         SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
 529         SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
 530         SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
 531         SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
 532         SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
 533         SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
 534
 535         SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
 536         SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
 537         SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
 538         SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
 539         SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
 540         SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
 541     }
 542
 543     if(avctx->debug & FF_DEBUG_BUGS)
 544         av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
 545                s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
 546                s->divx_packed ? "p" : "");
 547
 548 #if 0 // dump bits per frame / qp / complexity
 549 {
 550     static FILE *f=NULL;
 551     if(!f) f=fopen("rate_qp_cplx.txt", "w");
 552     fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
 553 }
 554 #endif
 555
 556 #if HAVE_MMX
 557     if (s->codec_id == CODEC_ID_MPEG4 && s->xvid_build>=0 && avctx->idct_algo == FF_IDCT_AUTO && (av_get_cpu_flags() & AV_CPU_FLAG_MMX)) {
 558         avctx->idct_algo= FF_IDCT_XVIDMMX;
 559         avctx->coded_width= 0; // force reinit
 560 //        dsputil_init(&s->dsp, avctx);
 561         s->picture_number=0;
 562     }
 563 #endif
 564
 565         /* After H263 & mpeg4 header decode we have the height, width,*/
 566         /* and other parameters. So then we could init the picture   */
 567         /* FIXME: By the way H263 decoder is evolving it should have */
 568         /* an H263EncContext                                         */
 569
 570     if (   s->width  != avctx->coded_width
 571         || s->height != avctx->coded_height) {
 572         /* H.263 could change picture size any time */
 573         ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
 574         s->parse_context.buffer=0;
 575         MPV_common_end(s);
 576         s->parse_context= pc;
 577     }
 578     if (!s->context_initialized) {
 579         avcodec_set_dimensions(avctx, s->width, s->height);
 580
 581         goto retry;
 582     }
 583
 584     if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P || s->codec_id == CODEC_ID_H263I))
 585         s->gob_index = ff_h263_get_gob_height(s);
 586
 587     // for hurry_up==5
 588     s->current_picture.pict_type= s->pict_type;
 589     s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
 590
 591     /* skip B-frames if we don't have reference frames */
 592     if(s->last_picture_ptr==NULL && (s->pict_type==FF_B_TYPE || s->dropable)) return get_consumed_bytes(s, buf_size);
 593     /* skip b frames if we are in a hurry */
 594     if(avctx->hurry_up && s->pict_type==FF_B_TYPE) return get_consumed_bytes(s, buf_size);
 595     if(   (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==FF_B_TYPE)
 596        || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=FF_I_TYPE)
 597        ||  avctx->skip_frame >= AVDISCARD_ALL)
 598         return get_consumed_bytes(s, buf_size);
 599     /* skip everything if we are in a hurry>=5 */
 600     if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
 601
 602     if(s->next_p_frame_damaged){
 603         if(s->pict_type==FF_B_TYPE)
 604             return get_consumed_bytes(s, buf_size);
 605         else
 606             s->next_p_frame_damaged=0;
 607     }
 608
 609     if((s->avctx->flags2 & CODEC_FLAG2_FAST) && s->pict_type==FF_B_TYPE){
 610         s->me.qpel_put= s->dsp.put_2tap_qpel_pixels_tab;
 611         s->me.qpel_avg= s->dsp.avg_2tap_qpel_pixels_tab;
 612     }else if((!s->no_rounding) || s->pict_type==FF_B_TYPE){
 613         s->me.qpel_put= s->dsp.put_qpel_pixels_tab;
 614         s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
 615     }else{
 616         s->me.qpel_put= s->dsp.put_no_rnd_qpel_pixels_tab;
 617         s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
 618     }
 619
 620     if(MPV_frame_start(s, avctx) < 0)
 621         return -1;
 622
 623     if (CONFIG_MPEG4_VDPAU_DECODER && (s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)) {
 624         ff_vdpau_mpeg4_decode_picture(s, s->gb.buffer, s->gb.buffer_end - s->gb.buffer);
 625         goto frame_end;
 626     }
 627
 628     if (avctx->hwaccel) {
 629         if (avctx->hwaccel->start_frame(avctx, s->gb.buffer, s->gb.buffer_end - s->gb.buffer) < 0)
 630             return -1;
 631     }
 632
 633     ff_er_frame_start(s);
 634
 635     //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
 636     //which is not available before MPV_frame_start()
 637     if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5){
 638         ret = ff_wmv2_decode_secondary_picture_header(s);
 639         if(ret<0) return ret;
 640         if(ret==1) goto intrax8_decoded;
 641     }
 642
 643     /* decode each macroblock */
 644     s->mb_x=0;
 645     s->mb_y=0;
 646
 647     decode_slice(s);
 648     while(s->mb_y<s->mb_height){
 649         if(s->msmpeg4_version){
 650             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)
 651                 break;
 652         }else{
 653             if(ff_h263_resync(s)<0)
 654                 break;
 655         }
 656
 657         if(s->msmpeg4_version<4 && s->h263_pred)
 658             ff_mpeg4_clean_buffers(s);
 659
 660         decode_slice(s);
 661     }
 662
 663     if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==FF_I_TYPE)
 664         if(!CONFIG_MSMPEG4_DECODER || msmpeg4_decode_ext_header(s, buf_size) < 0){
 665             s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
 666         }
 667
 668     assert(s->bitstream_buffer_size==0);
 669 frame_end:
 670     /* divx 5.01+ bistream reorder stuff */
 671     if(s->codec_id==CODEC_ID_MPEG4 && 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>7 && s->xvid_build>=0){ //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 #ifdef PRINT_FRAME_TIME
 725 av_log(avctx, AV_LOG_DEBUG, "%"PRId64"\n", rdtsc()-time);
 726 #endif
 727
 728     return get_consumed_bytes(s, buf_size);
 729 }
 730
 731 AVCodec h263_decoder = {
 732     "h263",
 733     AVMEDIA_TYPE_VIDEO,
 734     CODEC_ID_H263,
 735     sizeof(MpegEncContext),
 736     ff_h263_decode_init,
 737     NULL,
 738     ff_h263_decode_end,
 739     ff_h263_decode_frame,
 740     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
 741     .flush= ff_mpeg_flush,
 742     .max_lowres= 3,
 743     .long_name= NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
 744     .pix_fmts= ff_hwaccel_pixfmt_list_420,
 745 };