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                            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, (uint8_t **)&buf, &buf_size) < 0) {
 408         *poutbuf = NULL;
 409         *poutbuf_size = 0;
 410         return buf_size;
 411     }
 412
 413     *poutbuf = (uint8_t *)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     av_log(avctx, AV_LOG_DEBUG, "bytes=%x %x %x %x\n", buf[0], buf[1], buf[2], buf[3]);
 433 #endif
 434     s->flags= avctx->flags;
 435     s->flags2= avctx->flags2;
 436
 437     /* no supplementary picture */
 438     if (buf_size == 0) {
 439         /* special case for last picture */
 440         if (s->low_delay==0 && s->next_picture_ptr) {
 441             *pict= *(AVFrame*)s->next_picture_ptr;
 442             s->next_picture_ptr= NULL;
 443
 444             *data_size = sizeof(AVFrame);
 445         }
 446
 447         return 0;
 448     }
 449
 450     if(s->flags&CODEC_FLAG_TRUNCATED){
 451         int next;
 452
 453         if(s->codec_id==CODEC_ID_MPEG4){
 454             next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
 455         }else if(s->codec_id==CODEC_ID_H263){
 456             next= h263_find_frame_end(&s->parse_context, buf, buf_size);
 457         }else{
 458             av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n");
 459             return -1;
 460         }
 461
 462         if( ff_combine_frame(&s->parse_context, next, &buf, &buf_size) < 0 )
 463             return buf_size;
 464     }
 465
 466
 467 retry:
 468
 469     if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
 470         init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
 471     }else
 472         init_get_bits(&s->gb, buf, buf_size*8);
 473     s->bitstream_buffer_size=0;
 474
 475     if (!s->context_initialized) {
 476         if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
 477             return -1;
 478     }
 479
 480     //we need to set current_picture_ptr before reading the header, otherwise we cant store anyting im there
 481     if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){
 482         int i= ff_find_unused_picture(s, 0);
 483         s->current_picture_ptr= &s->picture[i];
 484     }
 485
 486     /* let's go :-) */
 487     if (s->msmpeg4_version==5) {
 488         ret= ff_wmv2_decode_picture_header(s);
 489     } else if (s->msmpeg4_version) {
 490         ret = msmpeg4_decode_picture_header(s);
 491     } else if (s->h263_pred) {
 492         if(s->avctx->extradata_size && s->picture_number==0){
 493             GetBitContext gb;
 494
 495             init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
 496             ret = ff_mpeg4_decode_picture_header(s, &gb);
 497         }
 498         ret = ff_mpeg4_decode_picture_header(s, &s->gb);
 499
 500         if(s->flags& CODEC_FLAG_LOW_DELAY)
 501             s->low_delay=1;
 502     } else if (s->codec_id == CODEC_ID_H263I) {
 503         ret = intel_h263_decode_picture_header(s);
 504     } else if (s->h263_flv) {
 505         ret = flv_h263_decode_picture_header(s);
 506     } else {
 507         ret = h263_decode_picture_header(s);
 508     }
 509
 510     if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size);
 511
 512     /* skip if the header was thrashed */
 513     if (ret < 0){
 514         av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
 515         return -1;
 516     }
 517
 518     avctx->has_b_frames= !s->low_delay;
 519
 520     if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
 521         if(s->stream_codec_tag == ff_get_fourcc("XVID") ||
 522            s->codec_tag == ff_get_fourcc("XVID") || s->codec_tag == ff_get_fourcc("XVIX") ||
 523            s->codec_tag == ff_get_fourcc("RMP4"))
 524             s->xvid_build= -1;
 525 #if 0
 526         if(s->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
 527            && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
 528             s->xvid_build= -1;
 529 #endif
 530     }
 531
 532     if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
 533         if(s->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
 534             s->divx_version= 400; //divx 4
 535     }
 536
 537     if(s->xvid_build && s->divx_version){
 538         s->divx_version=
 539         s->divx_build= 0;
 540     }
 541
 542     if(s->workaround_bugs&FF_BUG_AUTODETECT){
 543         if(s->codec_tag == ff_get_fourcc("XVIX"))
 544             s->workaround_bugs|= FF_BUG_XVID_ILACE;
 545
 546         if(s->codec_tag == ff_get_fourcc("UMP4")){
 547             s->workaround_bugs|= FF_BUG_UMP4;
 548         }
 549
 550         if(s->divx_version>=500){
 551             s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
 552         }
 553
 554         if(s->divx_version>502){
 555             s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
 556         }
 557
 558         if(s->xvid_build && s->xvid_build<=3)
 559             s->padding_bug_score= 256*256*256*64;
 560
 561         if(s->xvid_build && s->xvid_build<=1)
 562             s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
 563
 564         if(s->xvid_build && s->xvid_build<=12)
 565             s->workaround_bugs|= FF_BUG_EDGE;
 566
 567         if(s->xvid_build && s->xvid_build<=32)
 568             s->workaround_bugs|= FF_BUG_DC_CLIP;
 569
 570 #define SET_QPEL_FUNC(postfix1, postfix2) \
 571     s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
 572     s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
 573     s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
 574
 575         if(s->lavc_build && s->lavc_build<4653)
 576             s->workaround_bugs|= FF_BUG_STD_QPEL;
 577
 578         if(s->lavc_build && s->lavc_build<4655)
 579             s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
 580
 581         if(s->lavc_build && s->lavc_build<4670){
 582             s->workaround_bugs|= FF_BUG_EDGE;
 583         }
 584
 585         if(s->lavc_build && s->lavc_build<=4712)
 586             s->workaround_bugs|= FF_BUG_DC_CLIP;
 587
 588         if(s->divx_version)
 589             s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
 590 //printf("padding_bug_score: %d\n", s->padding_bug_score);
 591         if(s->divx_version==501 && s->divx_build==20020416)
 592             s->padding_bug_score= 256*256*256*64;
 593
 594         if(s->divx_version && s->divx_version<500){
 595             s->workaround_bugs|= FF_BUG_EDGE;
 596         }
 597
 598         if(s->divx_version)
 599             s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
 600 #if 0
 601         if(s->divx_version==500)
 602             s->padding_bug_score= 256*256*256*64;
 603
 604         /* very ugly XVID padding bug detection FIXME/XXX solve this differently
 605          * lets hope this at least works
 606          */
 607         if(   s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==0
 608            && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
 609             s->workaround_bugs|= FF_BUG_NO_PADDING;
 610
 611         if(s->lavc_build && s->lavc_build<4609) //FIXME not sure about the version num but a 4609 file seems ok
 612             s->workaround_bugs|= FF_BUG_NO_PADDING;
 613 #endif
 614     }
 615
 616     if(s->workaround_bugs& FF_BUG_STD_QPEL){
 617         SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
 618         SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
 619         SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
 620         SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
 621         SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
 622         SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
 623
 624         SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
 625         SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
 626         SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
 627         SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
 628         SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
 629         SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
 630     }
 631
 632     if(avctx->debug & FF_DEBUG_BUGS)
 633         av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
 634                s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
 635                s->divx_packed ? "p" : "");
 636
 637 #if 0 // dump bits per frame / qp / complexity
 638 {
 639     static FILE *f=NULL;
 640     if(!f) f=fopen("rate_qp_cplx.txt", "w");
 641     fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
 642 }
 643 #endif
 644
 645 #if defined(HAVE_MMX) && defined(CONFIG_GPL)
 646     if(s->codec_id == CODEC_ID_MPEG4 && s->xvid_build && avctx->idct_algo == FF_IDCT_AUTO && (ff_mm_flags & MM_MMX)){
 647         avctx->idct_algo= FF_IDCT_XVIDMMX;
 648         avctx->coded_width= 0; // force reinit
 649 //        dsputil_init(&s->dsp, avctx);
 650         s->picture_number=0;
 651     }
 652 #endif
 653
 654         /* After H263 & mpeg4 header decode we have the height, width,*/
 655         /* and other parameters. So then we could init the picture   */
 656         /* FIXME: By the way H263 decoder is evolving it should have */
 657         /* an H263EncContext                                         */
 658
 659     if (   s->width  != avctx->coded_width
 660         || s->height != avctx->coded_height) {
 661         /* H.263 could change picture size any time */
 662         ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
 663         s->parse_context.buffer=0;
 664         MPV_common_end(s);
 665         s->parse_context= pc;
 666     }
 667     if (!s->context_initialized) {
 668         avcodec_set_dimensions(avctx, s->width, s->height);
 669
 670         goto retry;
 671     }
 672
 673     if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P))
 674         s->gob_index = ff_h263_get_gob_height(s);
 675
 676     // for hurry_up==5
 677     s->current_picture.pict_type= s->pict_type;
 678     s->current_picture.key_frame= s->pict_type == I_TYPE;
 679
 680     /* skip B-frames if we don't have reference frames */
 681     if(s->last_picture_ptr==NULL && (s->pict_type==B_TYPE || s->dropable)) return get_consumed_bytes(s, buf_size);
 682     /* skip b frames if we are in a hurry */
 683     if(avctx->hurry_up && s->pict_type==B_TYPE) return get_consumed_bytes(s, buf_size);
 684     if(   (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==B_TYPE)
 685        || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=I_TYPE)
 686        ||  avctx->skip_frame >= AVDISCARD_ALL)
 687         return get_consumed_bytes(s, buf_size);
 688     /* skip everything if we are in a hurry>=5 */
 689     if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
 690
 691     if(s->next_p_frame_damaged){
 692         if(s->pict_type==B_TYPE)
 693             return get_consumed_bytes(s, buf_size);
 694         else
 695             s->next_p_frame_damaged=0;
 696     }
 697
 698     if((s->avctx->flags2 & CODEC_FLAG2_FAST) && s->pict_type==B_TYPE){
 699         s->me.qpel_put= s->dsp.put_2tap_qpel_pixels_tab;
 700         s->me.qpel_avg= s->dsp.avg_2tap_qpel_pixels_tab;
 701     }else if((!s->no_rounding) || s->pict_type==B_TYPE){
 702         s->me.qpel_put= s->dsp.put_qpel_pixels_tab;
 703         s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
 704     }else{
 705         s->me.qpel_put= s->dsp.put_no_rnd_qpel_pixels_tab;
 706         s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
 707     }
 708
 709     if(MPV_frame_start(s, avctx) < 0)
 710         return -1;
 711
 712 #ifdef DEBUG
 713     av_log(avctx, AV_LOG_DEBUG, "qscale=%d\n", s->qscale);
 714 #endif
 715
 716     ff_er_frame_start(s);
 717
 718     //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
 719     //which isnt available before MPV_frame_start()
 720     if (s->msmpeg4_version==5){
 721         if(ff_wmv2_decode_secondary_picture_header(s) < 0)
 722             return -1;
 723     }
 724
 725     /* decode each macroblock */
 726     s->mb_x=0;
 727     s->mb_y=0;
 728
 729     decode_slice(s);
 730     while(s->mb_y<s->mb_height){
 731         if(s->msmpeg4_version){
 732             if(s->mb_x!=0 || (s->mb_y%s->slice_height)!=0 || get_bits_count(&s->gb) > s->gb.size_in_bits)
 733                 break;
 734         }else{
 735             if(ff_h263_resync(s)<0)
 736                 break;
 737         }
 738
 739         if(s->msmpeg4_version<4 && s->h263_pred)
 740             ff_mpeg4_clean_buffers(s);
 741
 742         decode_slice(s);
 743     }
 744
 745     if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==I_TYPE)
 746         if(msmpeg4_decode_ext_header(s, buf_size) < 0){
 747             s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
 748         }
 749
 750     /* divx 5.01+ bistream reorder stuff */
 751     if(s->codec_id==CODEC_ID_MPEG4 && s->bitstream_buffer_size==0 && s->divx_packed){
 752         int current_pos= get_bits_count(&s->gb)>>3;
 753         int startcode_found=0;
 754
 755         if(buf_size - current_pos > 5){
 756             int i;
 757             for(i=current_pos; i<buf_size-3; i++){
 758                 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
 759                     startcode_found=1;
 760                     break;
 761                 }
 762             }
 763         }
 764         if(s->gb.buffer == s->bitstream_buffer && buf_size>20){ //xvid style
 765             startcode_found=1;
 766             current_pos=0;
 767         }
 768
 769         if(startcode_found){
 770             s->bitstream_buffer= av_fast_realloc(
 771                 s->bitstream_buffer,
 772                 &s->allocated_bitstream_buffer_size,
 773                 buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
 774             memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
 775             s->bitstream_buffer_size= buf_size - current_pos;
 776         }
 777     }
 778
 779     ff_er_frame_end(s);
 780
 781     MPV_frame_end(s);
 782
 783 assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);
 784 assert(s->current_picture.pict_type == s->pict_type);
 785     if (s->pict_type == B_TYPE || s->low_delay) {
 786         *pict= *(AVFrame*)s->current_picture_ptr;
 787     } else if (s->last_picture_ptr != NULL) {
 788         *pict= *(AVFrame*)s->last_picture_ptr;
 789     }
 790
 791     if(s->last_picture_ptr || s->low_delay){
 792         *data_size = sizeof(AVFrame);
 793         ff_print_debug_info(s, pict);
 794     }
 795
 796     /* Return the Picture timestamp as the frame number */
 797     /* we substract 1 because it is added on utils.c    */
 798     avctx->frame_number = s->picture_number - 1;
 799
 800 #ifdef PRINT_FRAME_TIME
 801 av_log(avctx, AV_LOG_DEBUG, "%"PRId64"\n", rdtsc()-time);
 802 #endif
 803
 804     return get_consumed_bytes(s, buf_size);
 805 }
 806
 807 AVCodec mpeg4_decoder = {
 808     "mpeg4",
 809     CODEC_TYPE_VIDEO,
 810     CODEC_ID_MPEG4,
 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 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
 817     .flush= ff_mpeg_flush,
 818 };
 819
 820 AVCodec h263_decoder = {
 821     "h263",
 822     CODEC_TYPE_VIDEO,
 823     CODEC_ID_H263,
 824     sizeof(MpegEncContext),
 825     ff_h263_decode_init,
 826     NULL,
 827     ff_h263_decode_end,
 828     ff_h263_decode_frame,
 829     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
 830     .flush= ff_mpeg_flush,
 831 };
 832
 833 AVCodec msmpeg4v1_decoder = {
 834     "msmpeg4v1",
 835     CODEC_TYPE_VIDEO,
 836     CODEC_ID_MSMPEG4V1,
 837     sizeof(MpegEncContext),
 838     ff_h263_decode_init,
 839     NULL,
 840     ff_h263_decode_end,
 841     ff_h263_decode_frame,
 842     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 843 };
 844
 845 AVCodec msmpeg4v2_decoder = {
 846     "msmpeg4v2",
 847     CODEC_TYPE_VIDEO,
 848     CODEC_ID_MSMPEG4V2,
 849     sizeof(MpegEncContext),
 850     ff_h263_decode_init,
 851     NULL,
 852     ff_h263_decode_end,
 853     ff_h263_decode_frame,
 854     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 855 };
 856
 857 AVCodec msmpeg4v3_decoder = {
 858     "msmpeg4",
 859     CODEC_TYPE_VIDEO,
 860     CODEC_ID_MSMPEG4V3,
 861     sizeof(MpegEncContext),
 862     ff_h263_decode_init,
 863     NULL,
 864     ff_h263_decode_end,
 865     ff_h263_decode_frame,
 866     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 867 };
 868
 869 AVCodec wmv1_decoder = {
 870     "wmv1",
 871     CODEC_TYPE_VIDEO,
 872     CODEC_ID_WMV1,
 873     sizeof(MpegEncContext),
 874     ff_h263_decode_init,
 875     NULL,
 876     ff_h263_decode_end,
 877     ff_h263_decode_frame,
 878     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 879 };
 880
 881 AVCodec h263i_decoder = {
 882     "h263i",
 883     CODEC_TYPE_VIDEO,
 884     CODEC_ID_H263I,
 885     sizeof(MpegEncContext),
 886     ff_h263_decode_init,
 887     NULL,
 888     ff_h263_decode_end,
 889     ff_h263_decode_frame,
 890     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 891 };
 892
 893 AVCodec flv_decoder = {
 894     "flv",
 895     CODEC_TYPE_VIDEO,
 896     CODEC_ID_FLV1,
 897     sizeof(MpegEncContext),
 898     ff_h263_decode_init,
 899     NULL,
 900     ff_h263_decode_end,
 901     ff_h263_decode_frame,
 902     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1
 903 };
 904
 905 #ifdef CONFIG_H263_PARSER
 906 AVCodecParser h263_parser = {
 907     { CODEC_ID_H263 },
 908     sizeof(ParseContext),
 909     NULL,
 910     h263_parse,
 911     ff_parse_close,
 912 };
 913 #endif