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 #include "h263_parser.h"
  32 #include "mpeg4video_parser.h"
  33 #include "msmpeg4.h"
  34
  35 //#define DEBUG
  36 //#define PRINT_FRAME_TIME
  37
  38 av_cold int ff_h263_decode_init(AVCodecContext *avctx)
  39 {
  40     MpegEncContext *s = avctx->priv_data;
  41
  42     s->avctx = avctx;
  43     s->out_format = FMT_H263;
  44
  45     s->width  = avctx->coded_width;
  46     s->height = avctx->coded_height;
  47     s->workaround_bugs= avctx->workaround_bugs;
  48
  49     // set defaults
  50     MPV_decode_defaults(s);
  51     s->quant_precision=5;
  52     s->decode_mb= ff_h263_decode_mb;
  53     s->low_delay= 1;
  54     avctx->pix_fmt= PIX_FMT_YUV420P;
  55     s->unrestricted_mv= 1;
  56
  57     /* select sub codec */
  58     switch(avctx->codec->id) {
  59     case CODEC_ID_H263:
  60         s->unrestricted_mv= 0;
  61         break;
  62     case CODEC_ID_MPEG4:
  63         s->decode_mb= ff_mpeg4_decode_mb;
  64         s->time_increment_bits = 4; /* default value for broken headers */
  65         s->h263_pred = 1;
  66         s->low_delay = 0; //default, might be overriden in the vol header during header parsing
  67         break;
  68     case CODEC_ID_MSMPEG4V1:
  69         s->h263_msmpeg4 = 1;
  70         s->h263_pred = 1;
  71         s->msmpeg4_version=1;
  72         break;
  73     case CODEC_ID_MSMPEG4V2:
  74         s->h263_msmpeg4 = 1;
  75         s->h263_pred = 1;
  76         s->msmpeg4_version=2;
  77         break;
  78     case CODEC_ID_MSMPEG4V3:
  79         s->h263_msmpeg4 = 1;
  80         s->h263_pred = 1;
  81         s->msmpeg4_version=3;
  82         break;
  83     case CODEC_ID_WMV1:
  84         s->h263_msmpeg4 = 1;
  85         s->h263_pred = 1;
  86         s->msmpeg4_version=4;
  87         break;
  88     case CODEC_ID_WMV2:
  89         s->h263_msmpeg4 = 1;
  90         s->h263_pred = 1;
  91         s->msmpeg4_version=5;
  92         break;
  93     case CODEC_ID_VC1:
  94     case CODEC_ID_WMV3:
  95     case CODEC_ID_VC1_VDPAU:
  96     case CODEC_ID_WMV3_VDPAU:
  97         s->h263_msmpeg4 = 1;
  98         s->h263_pred = 1;
  99         s->msmpeg4_version=6;
 100         break;
 101     case CODEC_ID_H263I:
 102         break;
 103     case CODEC_ID_FLV1:
 104         s->h263_flv = 1;
 105         break;
 106     default:
 107         return -1;
 108     }
 109     s->codec_id= avctx->codec->id;
 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 (ENABLE_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){
 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->partitioned_frame){
 165         const int qscale= s->qscale;
 166
 167         if(s->codec_id==CODEC_ID_MPEG4){
 168             if(ff_mpeg4_decode_partitions(s) < 0)
 169                 return -1;
 170         }
 171
 172         /* restore variables which were modified */
 173         s->first_slice_line=1;
 174         s->mb_x= s->resync_mb_x;
 175         s->mb_y= s->resync_mb_y;
 176         ff_set_qscale(s, qscale);
 177     }
 178
 179     for(; s->mb_y < s->mb_height; s->mb_y++) {
 180         /* per-row end of slice checks */
 181         if(s->msmpeg4_version){
 182             if(s->resync_mb_y + s->slice_height == s->mb_y){
 183                 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);
 184
 185                 return 0;
 186             }
 187         }
 188
 189         if(s->msmpeg4_version==1){
 190             s->last_dc[0]=
 191             s->last_dc[1]=
 192             s->last_dc[2]= 128;
 193         }
 194
 195         ff_init_block_index(s);
 196         for(; s->mb_x < s->mb_width; s->mb_x++) {
 197             int ret;
 198
 199             ff_update_block_index(s);
 200
 201             if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
 202                 s->first_slice_line=0;
 203             }
 204
 205             /* DCT & quantize */
 206
 207             s->mv_dir = MV_DIR_FORWARD;
 208             s->mv_type = MV_TYPE_16X16;
 209 //            s->mb_skipped = 0;
 210 //printf("%d %d %06X\n", ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
 211             ret= s->decode_mb(s, s->block);
 212
 213             if (s->pict_type!=FF_B_TYPE)
 214                 ff_h263_update_motion_val(s);
 215
 216             if(ret<0){
 217                 const int xy= s->mb_x + s->mb_y*s->mb_stride;
 218                 if(ret==SLICE_END){
 219                     MPV_decode_mb(s, s->block);
 220                     if(s->loop_filter)
 221                         ff_h263_loop_filter(s);
 222
 223 //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));
 224                     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);
 225
 226                     s->padding_bug_score--;
 227
 228                     if(++s->mb_x >= s->mb_width){
 229                         s->mb_x=0;
 230                         ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
 231                         s->mb_y++;
 232                     }
 233                     return 0;
 234                 }else if(ret==SLICE_NOEND){
 235                     av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy);
 236                     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);
 237                     return -1;
 238                 }
 239                 av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
 240                 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);
 241
 242                 return -1;
 243             }
 244
 245             MPV_decode_mb(s, s->block);
 246             if(s->loop_filter)
 247                 ff_h263_loop_filter(s);
 248         }
 249
 250         ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
 251
 252         s->mb_x= 0;
 253     }
 254
 255     assert(s->mb_x==0 && s->mb_y==s->mb_height);
 256
 257     /* try to detect the padding bug */
 258     if(      s->codec_id==CODEC_ID_MPEG4
 259        &&   (s->workaround_bugs&FF_BUG_AUTODETECT)
 260        &&    s->gb.size_in_bits - get_bits_count(&s->gb) >=0
 261        &&    s->gb.size_in_bits - get_bits_count(&s->gb) < 48
 262 //       &&   !s->resync_marker
 263        &&   !s->data_partitioning){
 264
 265         const int bits_count= get_bits_count(&s->gb);
 266         const int bits_left = s->gb.size_in_bits - bits_count;
 267
 268         if(bits_left==0){
 269             s->padding_bug_score+=16;
 270         } else if(bits_left != 1){
 271             int v= show_bits(&s->gb, 8);
 272             v|= 0x7F >> (7-(bits_count&7));
 273
 274             if(v==0x7F && bits_left<=8)
 275                 s->padding_bug_score--;
 276             else if(v==0x7F && ((get_bits_count(&s->gb)+8)&8) && bits_left<=16)
 277                 s->padding_bug_score+= 4;
 278             else
 279                 s->padding_bug_score++;
 280         }
 281     }
 282
 283     if(s->workaround_bugs&FF_BUG_AUTODETECT){
 284         if(s->padding_bug_score > -2 && !s->data_partitioning /*&& (s->divx_version || !s->resync_marker)*/)
 285             s->workaround_bugs |=  FF_BUG_NO_PADDING;
 286         else
 287             s->workaround_bugs &= ~FF_BUG_NO_PADDING;
 288     }
 289
 290     // handle formats which don't have unique end markers
 291     if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
 292         int left= s->gb.size_in_bits - get_bits_count(&s->gb);
 293         int max_extra=7;
 294
 295         /* no markers in M$ crap */
 296         if(s->msmpeg4_version && s->pict_type==FF_I_TYPE)
 297             max_extra+= 17;
 298
 299         /* buggy padding but the frame should still end approximately at the bitstream end */
 300         if((s->workaround_bugs&FF_BUG_NO_PADDING) && s->error_recognition>=3)
 301             max_extra+= 48;
 302         else if((s->workaround_bugs&FF_BUG_NO_PADDING))
 303             max_extra+= 256*256*256*64;
 304
 305         if(left>max_extra){
 306             av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
 307         }
 308         else if(left<0){
 309             av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
 310         }else
 311             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);
 312
 313         return 0;
 314     }
 315
 316     av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
 317             s->gb.size_in_bits - get_bits_count(&s->gb),
 318             show_bits(&s->gb, 24), s->padding_bug_score);
 319
 320     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);
 321
 322     return -1;
 323 }
 324
 325 int ff_h263_decode_frame(AVCodecContext *avctx,
 326                              void *data, int *data_size,
 327                              const uint8_t *buf, int buf_size)
 328 {
 329     MpegEncContext *s = avctx->priv_data;
 330     int ret;
 331     AVFrame *pict = data;
 332
 333 #ifdef PRINT_FRAME_TIME
 334 uint64_t time= rdtsc();
 335 #endif
 336 #ifdef DEBUG
 337     av_log(avctx, AV_LOG_DEBUG, "*****frame %d size=%d\n", avctx->frame_number, buf_size);
 338     if(buf_size>0)
 339         av_log(avctx, AV_LOG_DEBUG, "bytes=%x %x %x %x\n", buf[0], buf[1], buf[2], buf[3]);
 340 #endif
 341     s->flags= avctx->flags;
 342     s->flags2= avctx->flags2;
 343
 344     /* no supplementary picture */
 345     if (buf_size == 0) {
 346         /* special case for last picture */
 347         if (s->low_delay==0 && s->next_picture_ptr) {
 348             *pict= *(AVFrame*)s->next_picture_ptr;
 349             s->next_picture_ptr= NULL;
 350
 351             *data_size = sizeof(AVFrame);
 352         }
 353
 354         return 0;
 355     }
 356
 357     if(s->flags&CODEC_FLAG_TRUNCATED){
 358         int next;
 359
 360         if(ENABLE_MPEG4_DECODER && s->codec_id==CODEC_ID_MPEG4){
 361             next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
 362         }else if(ENABLE_H263_DECODER && s->codec_id==CODEC_ID_H263){
 363             next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
 364         }else{
 365             av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n");
 366             return -1;
 367         }
 368
 369         if( ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
 370             return buf_size;
 371     }
 372
 373
 374 retry:
 375
 376     if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
 377         init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
 378     }else
 379         init_get_bits(&s->gb, buf, buf_size*8);
 380     s->bitstream_buffer_size=0;
 381
 382     if (!s->context_initialized) {
 383         if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
 384             return -1;
 385     }
 386
 387     /* We need to set current_picture_ptr before reading the header,
 388      * otherwise we cannot store anyting in there */
 389     if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){
 390         int i= ff_find_unused_picture(s, 0);
 391         s->current_picture_ptr= &s->picture[i];
 392     }
 393
 394     /* let's go :-) */
 395     if (ENABLE_WMV2_DECODER && s->msmpeg4_version==5) {
 396         ret= ff_wmv2_decode_picture_header(s);
 397     } else if (ENABLE_MSMPEG4_DECODER && s->msmpeg4_version) {
 398         ret = msmpeg4_decode_picture_header(s);
 399     } else if (s->h263_pred) {
 400         if(s->avctx->extradata_size && s->picture_number==0){
 401             GetBitContext gb;
 402
 403             init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
 404             ret = ff_mpeg4_decode_picture_header(s, &gb);
 405         }
 406         ret = ff_mpeg4_decode_picture_header(s, &s->gb);
 407
 408         if(s->flags& CODEC_FLAG_LOW_DELAY)
 409             s->low_delay=1;
 410     } else if (s->codec_id == CODEC_ID_H263I) {
 411         ret = intel_h263_decode_picture_header(s);
 412     } else if (s->h263_flv) {
 413         ret = flv_h263_decode_picture_header(s);
 414     } else {
 415         ret = h263_decode_picture_header(s);
 416     }
 417
 418     if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size);
 419
 420     /* skip if the header was thrashed */
 421     if (ret < 0){
 422         av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
 423         return -1;
 424     }
 425
 426     avctx->has_b_frames= !s->low_delay;
 427
 428     if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
 429         if(s->stream_codec_tag == ff_get_fourcc("XVID") ||
 430            s->codec_tag == ff_get_fourcc("XVID") || s->codec_tag == ff_get_fourcc("XVIX") ||
 431            s->codec_tag == ff_get_fourcc("RMP4"))
 432             s->xvid_build= -1;
 433 #if 0
 434         if(s->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
 435            && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
 436             s->xvid_build= -1;
 437 #endif
 438     }
 439
 440     if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
 441         if(s->codec_tag == ff_get_fourcc("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
 442             s->divx_version= 400; //divx 4
 443     }
 444
 445     if(s->xvid_build && s->divx_version){
 446         s->divx_version=
 447         s->divx_build= 0;
 448     }
 449
 450     if(s->workaround_bugs&FF_BUG_AUTODETECT){
 451         if(s->codec_tag == ff_get_fourcc("XVIX"))
 452             s->workaround_bugs|= FF_BUG_XVID_ILACE;
 453
 454         if(s->codec_tag == ff_get_fourcc("UMP4")){
 455             s->workaround_bugs|= FF_BUG_UMP4;
 456         }
 457
 458         if(s->divx_version>=500 && s->divx_build<1814){
 459             s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
 460         }
 461
 462         if(s->divx_version>502 && s->divx_build<1814){
 463             s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
 464         }
 465
 466         if(s->xvid_build && s->xvid_build<=3)
 467             s->padding_bug_score= 256*256*256*64;
 468
 469         if(s->xvid_build && s->xvid_build<=1)
 470             s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
 471
 472         if(s->xvid_build && s->xvid_build<=12)
 473             s->workaround_bugs|= FF_BUG_EDGE;
 474
 475         if(s->xvid_build && s->xvid_build<=32)
 476             s->workaround_bugs|= FF_BUG_DC_CLIP;
 477
 478 #define SET_QPEL_FUNC(postfix1, postfix2) \
 479     s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
 480     s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
 481     s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
 482
 483         if(s->lavc_build && s->lavc_build<4653)
 484             s->workaround_bugs|= FF_BUG_STD_QPEL;
 485
 486         if(s->lavc_build && s->lavc_build<4655)
 487             s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
 488
 489         if(s->lavc_build && s->lavc_build<4670){
 490             s->workaround_bugs|= FF_BUG_EDGE;
 491         }
 492
 493         if(s->lavc_build && s->lavc_build<=4712)
 494             s->workaround_bugs|= FF_BUG_DC_CLIP;
 495
 496         if(s->divx_version)
 497             s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
 498 //printf("padding_bug_score: %d\n", s->padding_bug_score);
 499         if(s->divx_version==501 && s->divx_build==20020416)
 500             s->padding_bug_score= 256*256*256*64;
 501
 502         if(s->divx_version && s->divx_version<500){
 503             s->workaround_bugs|= FF_BUG_EDGE;
 504         }
 505
 506         if(s->divx_version)
 507             s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
 508 #if 0
 509         if(s->divx_version==500)
 510             s->padding_bug_score= 256*256*256*64;
 511
 512         /* very ugly XVID padding bug detection FIXME/XXX solve this differently
 513          * Let us hope this at least works.
 514          */
 515         if(   s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==0
 516            && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
 517             s->workaround_bugs|= FF_BUG_NO_PADDING;
 518
 519         if(s->lavc_build && s->lavc_build<4609) //FIXME not sure about the version num but a 4609 file seems ok
 520             s->workaround_bugs|= FF_BUG_NO_PADDING;
 521 #endif
 522     }
 523
 524     if(s->workaround_bugs& FF_BUG_STD_QPEL){
 525         SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
 526         SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
 527         SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
 528         SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
 529         SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
 530         SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
 531
 532         SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
 533         SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
 534         SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
 535         SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
 536         SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
 537         SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
 538     }
 539
 540     if(avctx->debug & FF_DEBUG_BUGS)
 541         av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
 542                s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
 543                s->divx_packed ? "p" : "");
 544
 545 #if 0 // dump bits per frame / qp / complexity
 546 {
 547     static FILE *f=NULL;
 548     if(!f) f=fopen("rate_qp_cplx.txt", "w");
 549     fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
 550 }
 551 #endif
 552
 553 #if defined(HAVE_MMX)
 554     if(s->codec_id == CODEC_ID_MPEG4 && s->xvid_build && avctx->idct_algo == FF_IDCT_AUTO && (mm_flags & FF_MM_MMX)){
 555         avctx->idct_algo= FF_IDCT_XVIDMMX;
 556         avctx->coded_width= 0; // force reinit
 557 //        dsputil_init(&s->dsp, avctx);
 558         s->picture_number=0;
 559     }
 560 #endif
 561
 562         /* After H263 & mpeg4 header decode we have the height, width,*/
 563         /* and other parameters. So then we could init the picture   */
 564         /* FIXME: By the way H263 decoder is evolving it should have */
 565         /* an H263EncContext                                         */
 566
 567     if (   s->width  != avctx->coded_width
 568         || s->height != avctx->coded_height) {
 569         /* H.263 could change picture size any time */
 570         ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
 571         s->parse_context.buffer=0;
 572         MPV_common_end(s);
 573         s->parse_context= pc;
 574     }
 575     if (!s->context_initialized) {
 576         avcodec_set_dimensions(avctx, s->width, s->height);
 577
 578         goto retry;
 579     }
 580
 581     if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P))
 582         s->gob_index = ff_h263_get_gob_height(s);
 583
 584     // for hurry_up==5
 585     s->current_picture.pict_type= s->pict_type;
 586     s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
 587
 588     /* skip B-frames if we don't have reference frames */
 589     if(s->last_picture_ptr==NULL && (s->pict_type==FF_B_TYPE || s->dropable)) return get_consumed_bytes(s, buf_size);
 590     /* skip b frames if we are in a hurry */
 591     if(avctx->hurry_up && s->pict_type==FF_B_TYPE) return get_consumed_bytes(s, buf_size);
 592     if(   (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==FF_B_TYPE)
 593        || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=FF_I_TYPE)
 594        ||  avctx->skip_frame >= AVDISCARD_ALL)
 595         return get_consumed_bytes(s, buf_size);
 596     /* skip everything if we are in a hurry>=5 */
 597     if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
 598
 599     if(s->next_p_frame_damaged){
 600         if(s->pict_type==FF_B_TYPE)
 601             return get_consumed_bytes(s, buf_size);
 602         else
 603             s->next_p_frame_damaged=0;
 604     }
 605
 606     if((s->avctx->flags2 & CODEC_FLAG2_FAST) && s->pict_type==FF_B_TYPE){
 607         s->me.qpel_put= s->dsp.put_2tap_qpel_pixels_tab;
 608         s->me.qpel_avg= s->dsp.avg_2tap_qpel_pixels_tab;
 609     }else if((!s->no_rounding) || s->pict_type==FF_B_TYPE){
 610         s->me.qpel_put= s->dsp.put_qpel_pixels_tab;
 611         s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
 612     }else{
 613         s->me.qpel_put= s->dsp.put_no_rnd_qpel_pixels_tab;
 614         s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
 615     }
 616
 617     if(MPV_frame_start(s, avctx) < 0)
 618         return -1;
 619
 620 #ifdef DEBUG
 621     av_log(avctx, AV_LOG_DEBUG, "qscale=%d\n", s->qscale);
 622 #endif
 623
 624     ff_er_frame_start(s);
 625
 626     //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
 627     //which is not available before MPV_frame_start()
 628     if (ENABLE_WMV2_DECODER && s->msmpeg4_version==5){
 629         ret = ff_wmv2_decode_secondary_picture_header(s);
 630         if(ret<0) return ret;
 631         if(ret==1) goto intrax8_decoded;
 632     }
 633
 634     /* decode each macroblock */
 635     s->mb_x=0;
 636     s->mb_y=0;
 637
 638     decode_slice(s);
 639     while(s->mb_y<s->mb_height){
 640         if(s->msmpeg4_version){
 641             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)
 642                 break;
 643         }else{
 644             if(ff_h263_resync(s)<0)
 645                 break;
 646         }
 647
 648         if(s->msmpeg4_version<4 && s->h263_pred)
 649             ff_mpeg4_clean_buffers(s);
 650
 651         decode_slice(s);
 652     }
 653
 654     if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==FF_I_TYPE)
 655         if(!ENABLE_MSMPEG4_DECODER || msmpeg4_decode_ext_header(s, buf_size) < 0){
 656             s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
 657         }
 658
 659     /* divx 5.01+ bistream reorder stuff */
 660     if(s->codec_id==CODEC_ID_MPEG4 && s->bitstream_buffer_size==0 && s->divx_packed){
 661         int current_pos= get_bits_count(&s->gb)>>3;
 662         int startcode_found=0;
 663
 664         if(buf_size - current_pos > 5){
 665             int i;
 666             for(i=current_pos; i<buf_size-3; i++){
 667                 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
 668                     startcode_found=1;
 669                     break;
 670                 }
 671             }
 672         }
 673         if(s->gb.buffer == s->bitstream_buffer && buf_size>20){ //xvid style
 674             startcode_found=1;
 675             current_pos=0;
 676         }
 677
 678         if(startcode_found){
 679             s->bitstream_buffer= av_fast_realloc(
 680                 s->bitstream_buffer,
 681                 &s->allocated_bitstream_buffer_size,
 682                 buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
 683             memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
 684             s->bitstream_buffer_size= buf_size - current_pos;
 685         }
 686     }
 687
 688 intrax8_decoded:
 689     ff_er_frame_end(s);
 690
 691     MPV_frame_end(s);
 692
 693 assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);
 694 assert(s->current_picture.pict_type == s->pict_type);
 695     if (s->pict_type == FF_B_TYPE || s->low_delay) {
 696         *pict= *(AVFrame*)s->current_picture_ptr;
 697     } else if (s->last_picture_ptr != NULL) {
 698         *pict= *(AVFrame*)s->last_picture_ptr;
 699     }
 700
 701     if(s->last_picture_ptr || s->low_delay){
 702         *data_size = sizeof(AVFrame);
 703         ff_print_debug_info(s, pict);
 704     }
 705
 706     /* Return the Picture timestamp as the frame number */
 707     /* we subtract 1 because it is added on utils.c     */
 708     avctx->frame_number = s->picture_number - 1;
 709
 710 #ifdef PRINT_FRAME_TIME
 711 av_log(avctx, AV_LOG_DEBUG, "%"PRId64"\n", rdtsc()-time);
 712 #endif
 713
 714     return get_consumed_bytes(s, buf_size);
 715 }
 716
 717 AVCodec mpeg4_decoder = {
 718     "mpeg4",
 719     CODEC_TYPE_VIDEO,
 720     CODEC_ID_MPEG4,
 721     sizeof(MpegEncContext),
 722     ff_h263_decode_init,
 723     NULL,
 724     ff_h263_decode_end,
 725     ff_h263_decode_frame,
 726     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
 727     .flush= ff_mpeg_flush,
 728     .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
 729 };
 730
 731 AVCodec h263_decoder = {
 732     "h263",
 733     CODEC_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     .long_name= NULL_IF_CONFIG_SMALL("H.263"),
 743 };
 744
 745 AVCodec msmpeg4v1_decoder = {
 746     "msmpeg4v1",
 747     CODEC_TYPE_VIDEO,
 748     CODEC_ID_MSMPEG4V1,
 749     sizeof(MpegEncContext),
 750     ff_h263_decode_init,
 751     NULL,
 752     ff_h263_decode_end,
 753     ff_h263_decode_frame,
 754     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 755     .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 1"),
 756 };
 757
 758 AVCodec msmpeg4v2_decoder = {
 759     "msmpeg4v2",
 760     CODEC_TYPE_VIDEO,
 761     CODEC_ID_MSMPEG4V2,
 762     sizeof(MpegEncContext),
 763     ff_h263_decode_init,
 764     NULL,
 765     ff_h263_decode_end,
 766     ff_h263_decode_frame,
 767     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 768     .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 2"),
 769 };
 770
 771 AVCodec msmpeg4v3_decoder = {
 772     "msmpeg4",
 773     CODEC_TYPE_VIDEO,
 774     CODEC_ID_MSMPEG4V3,
 775     sizeof(MpegEncContext),
 776     ff_h263_decode_init,
 777     NULL,
 778     ff_h263_decode_end,
 779     ff_h263_decode_frame,
 780     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 781     .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 3"),
 782 };
 783
 784 AVCodec wmv1_decoder = {
 785     "wmv1",
 786     CODEC_TYPE_VIDEO,
 787     CODEC_ID_WMV1,
 788     sizeof(MpegEncContext),
 789     ff_h263_decode_init,
 790     NULL,
 791     ff_h263_decode_end,
 792     ff_h263_decode_frame,
 793     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 794     .long_name= NULL_IF_CONFIG_SMALL("Windows Media Video 7"),
 795 };
 796
 797 AVCodec h263i_decoder = {
 798     "h263i",
 799     CODEC_TYPE_VIDEO,
 800     CODEC_ID_H263I,
 801     sizeof(MpegEncContext),
 802     ff_h263_decode_init,
 803     NULL,
 804     ff_h263_decode_end,
 805     ff_h263_decode_frame,
 806     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 807     .long_name = NULL_IF_CONFIG_SMALL("H.263i"),
 808 };
 809
 810 AVCodec flv_decoder = {
 811     "flv",
 812     CODEC_TYPE_VIDEO,
 813     CODEC_ID_FLV1,
 814     sizeof(MpegEncContext),
 815     ff_h263_decode_init,
 816     NULL,
 817     ff_h263_decode_end,
 818     ff_h263_decode_frame,
 819     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 820     .long_name= NULL_IF_CONFIG_SMALL("Flash Video"),
 821 };