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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 #define UNCHECKED_BITSTREAM_READER 1
  29
  30 #include "libavutil/cpu.h"
  31 #include "internal.h"
  32 #include "avcodec.h"
  33 #include "error_resilience.h"
  34 #include "mpegvideo.h"
  35 #include "h263.h"
  36 #include "h263_parser.h"
  37 #include "mpeg4video_parser.h"
  38 #include "msmpeg4.h"
  39 #include "vdpau_internal.h"
  40 #include "thread.h"
  41 #include "flv.h"
  42 #include "mpeg4video.h"
  43
  44 av_cold int ff_h263_decode_init(AVCodecContext *avctx)
  45 {
  46     MpegEncContext *s = avctx->priv_data;
  47     int ret;
  48
  49     s->avctx = avctx;
  50     s->out_format = FMT_H263;
  51
  52     s->width  = avctx->coded_width;
  53     s->height = avctx->coded_height;
  54     s->workaround_bugs= avctx->workaround_bugs;
  55
  56     // set defaults
  57     ff_MPV_decode_defaults(s);
  58     s->quant_precision=5;
  59     s->decode_mb= ff_h263_decode_mb;
  60     s->low_delay= 1;
  61     if (avctx->codec->id == AV_CODEC_ID_MSS2)
  62         avctx->pix_fmt = AV_PIX_FMT_YUV420P;
  63     else
  64         avctx->pix_fmt = avctx->get_format(avctx, avctx->codec->pix_fmts);
  65     s->unrestricted_mv= 1;
  66
  67     /* select sub codec */
  68     switch(avctx->codec->id) {
  69     case AV_CODEC_ID_H263:
  70     case AV_CODEC_ID_H263P:
  71         s->unrestricted_mv= 0;
  72         avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
  73         break;
  74     case AV_CODEC_ID_MPEG4:
  75         break;
  76     case AV_CODEC_ID_MSMPEG4V1:
  77         s->h263_pred = 1;
  78         s->msmpeg4_version=1;
  79         break;
  80     case AV_CODEC_ID_MSMPEG4V2:
  81         s->h263_pred = 1;
  82         s->msmpeg4_version=2;
  83         break;
  84     case AV_CODEC_ID_MSMPEG4V3:
  85         s->h263_pred = 1;
  86         s->msmpeg4_version=3;
  87         break;
  88     case AV_CODEC_ID_WMV1:
  89         s->h263_pred = 1;
  90         s->msmpeg4_version=4;
  91         break;
  92     case AV_CODEC_ID_WMV2:
  93         s->h263_pred = 1;
  94         s->msmpeg4_version=5;
  95         break;
  96     case AV_CODEC_ID_VC1:
  97     case AV_CODEC_ID_WMV3:
  98     case AV_CODEC_ID_VC1IMAGE:
  99     case AV_CODEC_ID_WMV3IMAGE:
 100     case AV_CODEC_ID_MSS2:
 101         s->h263_pred = 1;
 102         s->msmpeg4_version=6;
 103         avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
 104         break;
 105     case AV_CODEC_ID_H263I:
 106         break;
 107     case AV_CODEC_ID_FLV1:
 108         s->h263_flv = 1;
 109         break;
 110     default:
 111         return AVERROR(EINVAL);
 112     }
 113     s->codec_id= avctx->codec->id;
 114     avctx->hwaccel= ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
 115
 116     if (avctx->stream_codec_tag == AV_RL32("l263") && avctx->extradata_size == 56 && avctx->extradata[0] == 1)
 117         s->ehc_mode = 1;
 118
 119     /* for h263, we allocate the images after having read the header */
 120     if (avctx->codec->id != AV_CODEC_ID_H263 && avctx->codec->id != AV_CODEC_ID_H263P && avctx->codec->id != AV_CODEC_ID_MPEG4)
 121         if ((ret = ff_MPV_common_init(s)) < 0)
 122             return ret;
 123
 124         ff_h263_decode_init_vlc();
 125
 126     return 0;
 127 }
 128
 129 av_cold int ff_h263_decode_end(AVCodecContext *avctx)
 130 {
 131     MpegEncContext *s = avctx->priv_data;
 132
 133     ff_MPV_common_end(s);
 134     return 0;
 135 }
 136
 137 /**
 138  * Return the number of bytes consumed for building the current frame.
 139  */
 140 static int get_consumed_bytes(MpegEncContext *s, int buf_size){
 141     int pos= (get_bits_count(&s->gb)+7)>>3;
 142
 143     if(s->divx_packed || s->avctx->hwaccel){
 144         //we would have to scan through the whole buf to handle the weird reordering ...
 145         return buf_size;
 146     }else if(s->flags&CODEC_FLAG_TRUNCATED){
 147         pos -= s->parse_context.last_index;
 148         if(pos<0) pos=0; // padding is not really read so this might be -1
 149         return pos;
 150     }else{
 151         if(pos==0) pos=1; //avoid infinite loops (i doubt that is needed but ...)
 152         if(pos+10>buf_size) pos=buf_size; // oops ;)
 153
 154         return pos;
 155     }
 156 }
 157
 158 static int decode_slice(MpegEncContext *s){
 159     const int part_mask= s->partitioned_frame ? (ER_AC_END|ER_AC_ERROR) : 0x7F;
 160     const int mb_size= 16>>s->avctx->lowres;
 161     int ret;
 162
 163     s->last_resync_gb= s->gb;
 164     s->first_slice_line= 1;
 165
 166     s->resync_mb_x= s->mb_x;
 167     s->resync_mb_y= s->mb_y;
 168
 169     ff_set_qscale(s, s->qscale);
 170
 171     if (s->avctx->hwaccel) {
 172         const uint8_t *start= s->gb.buffer + get_bits_count(&s->gb)/8;
 173         ret = s->avctx->hwaccel->decode_slice(s->avctx, start, s->gb.buffer_end - start);
 174         // ensure we exit decode loop
 175         s->mb_y = s->mb_height;
 176         return ret;
 177     }
 178
 179     if(s->partitioned_frame){
 180         const int qscale= s->qscale;
 181
 182         if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4){
 183             if ((ret = ff_mpeg4_decode_partitions(s)) < 0)
 184                 return ret;
 185         }
 186
 187         /* restore variables which were modified */
 188         s->first_slice_line=1;
 189         s->mb_x= s->resync_mb_x;
 190         s->mb_y= s->resync_mb_y;
 191         ff_set_qscale(s, qscale);
 192     }
 193
 194     for(; s->mb_y < s->mb_height; s->mb_y++) {
 195         /* per-row end of slice checks */
 196         if(s->msmpeg4_version){
 197             if(s->resync_mb_y + s->slice_height == s->mb_y){
 198                 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_MB_END);
 199
 200                 return 0;
 201             }
 202         }
 203
 204         if(s->msmpeg4_version==1){
 205             s->last_dc[0]=
 206             s->last_dc[1]=
 207             s->last_dc[2]= 128;
 208         }
 209
 210         ff_init_block_index(s);
 211         for(; s->mb_x < s->mb_width; s->mb_x++) {
 212             int ret;
 213
 214             ff_update_block_index(s);
 215
 216             if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
 217                 s->first_slice_line=0;
 218             }
 219
 220             /* DCT & quantize */
 221
 222             s->mv_dir = MV_DIR_FORWARD;
 223             s->mv_type = MV_TYPE_16X16;
 224 //            s->mb_skipped = 0;
 225             av_dlog(s, "%d %d %06X\n",
 226                     ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
 227             ret= s->decode_mb(s, s->block);
 228
 229             if (s->pict_type!=AV_PICTURE_TYPE_B)
 230                 ff_h263_update_motion_val(s);
 231
 232             if(ret<0){
 233                 const int xy= s->mb_x + s->mb_y*s->mb_stride;
 234                 if(ret==SLICE_END){
 235                     ff_MPV_decode_mb(s, s->block);
 236                     if(s->loop_filter)
 237                         ff_h263_loop_filter(s);
 238
 239                     ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_MB_END&part_mask);
 240
 241                     s->padding_bug_score--;
 242
 243                     if(++s->mb_x >= s->mb_width){
 244                         s->mb_x=0;
 245                         ff_mpeg_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
 246                         ff_MPV_report_decode_progress(s);
 247                         s->mb_y++;
 248                     }
 249                     return 0;
 250                 }else if(ret==SLICE_NOEND){
 251                     av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy);
 252                     ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x+1, s->mb_y, ER_MB_END&part_mask);
 253                     return AVERROR_INVALIDDATA;
 254                 }
 255                 av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
 256                 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR&part_mask);
 257
 258                 return AVERROR_INVALIDDATA;
 259             }
 260
 261             ff_MPV_decode_mb(s, s->block);
 262             if(s->loop_filter)
 263                 ff_h263_loop_filter(s);
 264         }
 265
 266         ff_mpeg_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
 267         ff_MPV_report_decode_progress(s);
 268
 269         s->mb_x= 0;
 270     }
 271
 272     av_assert1(s->mb_x==0 && s->mb_y==s->mb_height);
 273
 274     if(s->codec_id==AV_CODEC_ID_MPEG4
 275        && (s->workaround_bugs&FF_BUG_AUTODETECT)
 276        && get_bits_left(&s->gb) >= 48
 277        && show_bits(&s->gb, 24)==0x4010
 278        && !s->data_partitioning)
 279         s->padding_bug_score+=32;
 280
 281     /* try to detect the padding bug */
 282     if(      s->codec_id==AV_CODEC_ID_MPEG4
 283        &&   (s->workaround_bugs&FF_BUG_AUTODETECT)
 284        &&    get_bits_left(&s->gb) >=0
 285        &&    get_bits_left(&s->gb) < 137
 286 //       &&   !s->resync_marker
 287        &&   !s->data_partitioning){
 288
 289         const int bits_count= get_bits_count(&s->gb);
 290         const int bits_left = s->gb.size_in_bits - bits_count;
 291
 292         if(bits_left==0){
 293             s->padding_bug_score+=16;
 294         } else if(bits_left != 1){
 295             int v= show_bits(&s->gb, 8);
 296             v|= 0x7F >> (7-(bits_count&7));
 297
 298             if(v==0x7F && bits_left<=8)
 299                 s->padding_bug_score--;
 300             else if(v==0x7F && ((get_bits_count(&s->gb)+8)&8) && bits_left<=16)
 301                 s->padding_bug_score+= 4;
 302             else
 303                 s->padding_bug_score++;
 304         }
 305     }
 306
 307     if(s->workaround_bugs&FF_BUG_AUTODETECT){
 308         if(s->padding_bug_score > -2 && !s->data_partitioning /*&& (s->divx_version>=0 || !s->resync_marker)*/)
 309             s->workaround_bugs |=  FF_BUG_NO_PADDING;
 310         else
 311             s->workaround_bugs &= ~FF_BUG_NO_PADDING;
 312     }
 313
 314     // handle formats which don't have unique end markers
 315     if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
 316         int left= get_bits_left(&s->gb);
 317         int max_extra=7;
 318
 319         /* no markers in M$ crap */
 320         if(s->msmpeg4_version && s->pict_type==AV_PICTURE_TYPE_I)
 321             max_extra+= 17;
 322
 323         /* buggy padding but the frame should still end approximately at the bitstream end */
 324         if((s->workaround_bugs&FF_BUG_NO_PADDING) && (s->err_recognition&(AV_EF_BUFFER|AV_EF_AGGRESSIVE)))
 325             max_extra+= 48;
 326         else if((s->workaround_bugs&FF_BUG_NO_PADDING))
 327             max_extra+= 256*256*256*64;
 328
 329         if(left>max_extra){
 330             av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
 331         }
 332         else if(left<0){
 333             av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
 334         }else
 335             ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_MB_END);
 336
 337         return 0;
 338     }
 339
 340     av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
 341             get_bits_left(&s->gb),
 342             show_bits(&s->gb, 24), s->padding_bug_score);
 343
 344     ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_MB_END&part_mask);
 345
 346     return AVERROR_INVALIDDATA;
 347 }
 348
 349 int ff_h263_decode_frame(AVCodecContext *avctx,
 350                              void *data, int *got_frame,
 351                              AVPacket *avpkt)
 352 {
 353     const uint8_t *buf = avpkt->data;
 354     int buf_size = avpkt->size;
 355     MpegEncContext *s = avctx->priv_data;
 356     int ret;
 357     AVFrame *pict = data;
 358
 359     s->flags= avctx->flags;
 360     s->flags2= avctx->flags2;
 361
 362     /* no supplementary picture */
 363     if (buf_size == 0) {
 364         /* special case for last picture */
 365         if (s->low_delay==0 && s->next_picture_ptr) {
 366             if ((ret = av_frame_ref(pict, &s->next_picture_ptr->f)) < 0)
 367                 return ret;
 368             s->next_picture_ptr= NULL;
 369
 370             *got_frame = 1;
 371         }
 372
 373         return 0;
 374     }
 375
 376     if(s->flags&CODEC_FLAG_TRUNCATED){
 377         int next;
 378
 379         if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4){
 380             next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
 381         }else if(CONFIG_H263_DECODER && s->codec_id==AV_CODEC_ID_H263){
 382             next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
 383         }else if(CONFIG_H263P_DECODER && s->codec_id==AV_CODEC_ID_H263P){
 384             next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
 385         }else{
 386             av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n");
 387             return AVERROR(EINVAL);
 388         }
 389
 390         if( ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
 391             return buf_size;
 392     }
 393
 394
 395 retry:
 396     if(s->divx_packed && s->bitstream_buffer_size){
 397         int i;
 398         for(i=0; i<buf_size-3; i++){
 399             if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1){
 400                 if(buf[i+3]==0xB0){
 401                     av_log(s->avctx, AV_LOG_WARNING, "Discarding excessive bitstream in packed xvid\n");
 402                     s->bitstream_buffer_size=0;
 403                 }
 404                 break;
 405             }
 406         }
 407     }
 408
 409     if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
 410         init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
 411     }else
 412         init_get_bits(&s->gb, buf, buf_size*8);
 413     s->bitstream_buffer_size=0;
 414
 415     if (!s->context_initialized) {
 416         if ((ret = ff_MPV_common_init(s)) < 0) //we need the idct permutaton for reading a custom matrix
 417             return ret;
 418     }
 419
 420     /* We need to set current_picture_ptr before reading the header,
 421      * otherwise we cannot store anyting in there */
 422     if (s->current_picture_ptr == NULL || s->current_picture_ptr->f.data[0]) {
 423         int i= ff_find_unused_picture(s, 0);
 424         if (i < 0)
 425             return i;
 426         s->current_picture_ptr= &s->picture[i];
 427     }
 428
 429     /* let's go :-) */
 430     if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5) {
 431         ret= ff_wmv2_decode_picture_header(s);
 432     } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
 433         ret = ff_msmpeg4_decode_picture_header(s);
 434     } else if (CONFIG_MPEG4_DECODER && s->h263_pred) {
 435         if(s->avctx->extradata_size && s->picture_number==0){
 436             GetBitContext gb;
 437
 438             init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
 439             ret = ff_mpeg4_decode_picture_header(s, &gb);
 440         }
 441         ret = ff_mpeg4_decode_picture_header(s, &s->gb);
 442     } else if (CONFIG_H263I_DECODER && s->codec_id == AV_CODEC_ID_H263I) {
 443         ret = ff_intel_h263_decode_picture_header(s);
 444     } else if (CONFIG_FLV_DECODER && s->h263_flv) {
 445         ret = ff_flv_decode_picture_header(s);
 446     } else {
 447         ret = ff_h263_decode_picture_header(s);
 448     }
 449
 450     if (ret < 0 || ret==FRAME_SKIPPED) {
 451         if (   s->width  != avctx->coded_width
 452             || s->height != avctx->coded_height) {
 453                 av_log(s->avctx, AV_LOG_WARNING, "Reverting picture dimensions change due to header decoding failure\n");
 454                 s->width = avctx->coded_width;
 455                 s->height= avctx->coded_height;
 456         }
 457     }
 458     if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size);
 459
 460     /* skip if the header was thrashed */
 461     if (ret < 0){
 462         av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
 463         return ret;
 464     }
 465
 466     avctx->has_b_frames= !s->low_delay;
 467
 468     if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){
 469         if(s->stream_codec_tag == AV_RL32("XVID") ||
 470            s->codec_tag == AV_RL32("XVID") || s->codec_tag == AV_RL32("XVIX") ||
 471            s->codec_tag == AV_RL32("RMP4") || s->codec_tag == AV_RL32("ZMP4") ||
 472            s->codec_tag == AV_RL32("SIPP")
 473            )
 474             s->xvid_build= 0;
 475 #if 0
 476         if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
 477            && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
 478             s->xvid_build= 0;
 479 #endif
 480     }
 481
 482     if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){
 483         if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
 484             s->divx_version= 400; //divx 4
 485     }
 486
 487     if(s->xvid_build>=0 && s->divx_version>=0){
 488         s->divx_version=
 489         s->divx_build= -1;
 490     }
 491
 492     if(s->workaround_bugs&FF_BUG_AUTODETECT){
 493         if(s->codec_tag == AV_RL32("XVIX"))
 494             s->workaround_bugs|= FF_BUG_XVID_ILACE;
 495
 496         if(s->codec_tag == AV_RL32("UMP4")){
 497             s->workaround_bugs|= FF_BUG_UMP4;
 498         }
 499
 500         if(s->divx_version>=500 && s->divx_build<1814){
 501             s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
 502         }
 503
 504         if(s->divx_version>502 && s->divx_build<1814){
 505             s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
 506         }
 507
 508         if(s->xvid_build<=3U)
 509             s->padding_bug_score= 256*256*256*64;
 510
 511         if(s->xvid_build<=1U)
 512             s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
 513
 514         if(s->xvid_build<=12U)
 515             s->workaround_bugs|= FF_BUG_EDGE;
 516
 517         if(s->xvid_build<=32U)
 518             s->workaround_bugs|= FF_BUG_DC_CLIP;
 519
 520 #define SET_QPEL_FUNC(postfix1, postfix2) \
 521     s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
 522     s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
 523     s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
 524
 525         if(s->lavc_build<4653U)
 526             s->workaround_bugs|= FF_BUG_STD_QPEL;
 527
 528         if(s->lavc_build<4655U)
 529             s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
 530
 531         if(s->lavc_build<4670U){
 532             s->workaround_bugs|= FF_BUG_EDGE;
 533         }
 534
 535         if(s->lavc_build<=4712U)
 536             s->workaround_bugs|= FF_BUG_DC_CLIP;
 537
 538         if(s->divx_version>=0)
 539             s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
 540         if(s->divx_version==501 && s->divx_build==20020416)
 541             s->padding_bug_score= 256*256*256*64;
 542
 543         if(s->divx_version<500U){
 544             s->workaround_bugs|= FF_BUG_EDGE;
 545         }
 546
 547         if(s->divx_version>=0)
 548             s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
 549 #if 0
 550         if(s->divx_version==500)
 551             s->padding_bug_score= 256*256*256*64;
 552
 553         /* very ugly XVID padding bug detection FIXME/XXX solve this differently
 554          * Let us hope this at least works.
 555          */
 556         if(   s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==-1
 557            && s->codec_id==AV_CODEC_ID_MPEG4 && s->vo_type==0)
 558             s->workaround_bugs|= FF_BUG_NO_PADDING;
 559
 560         if(s->lavc_build<4609U) //FIXME not sure about the version num but a 4609 file seems ok
 561             s->workaround_bugs|= FF_BUG_NO_PADDING;
 562 #endif
 563     }
 564
 565     if(s->workaround_bugs& FF_BUG_STD_QPEL){
 566         SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
 567         SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
 568         SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
 569         SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
 570         SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
 571         SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
 572
 573         SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
 574         SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
 575         SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
 576         SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
 577         SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
 578         SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
 579     }
 580
 581     if(avctx->debug & FF_DEBUG_BUGS)
 582         av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
 583                s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
 584                s->divx_packed ? "p" : "");
 585
 586 #if HAVE_MMX
 587     if (s->codec_id == AV_CODEC_ID_MPEG4 && s->xvid_build>=0 && avctx->idct_algo == FF_IDCT_AUTO && (av_get_cpu_flags() & AV_CPU_FLAG_MMX)) {
 588         avctx->idct_algo= FF_IDCT_XVIDMMX;
 589         ff_dct_common_init(s);
 590         goto retry;
 591     }
 592 #endif
 593
 594         /* After H263 & mpeg4 header decode we have the height, width,*/
 595         /* and other parameters. So then we could init the picture   */
 596         /* FIXME: By the way H263 decoder is evolving it should have */
 597         /* an H263EncContext                                         */
 598
 599     if (s->width  != avctx->coded_width  ||
 600         s->height != avctx->coded_height ||
 601         s->context_reinit) {
 602         /* H.263 could change picture size any time */
 603         s->context_reinit = 0;
 604
 605         avcodec_set_dimensions(avctx, s->width, s->height);
 606
 607         if ((ret = ff_MPV_common_frame_size_change(s)))
 608             return ret;
 609     }
 610
 611     if((s->codec_id==AV_CODEC_ID_H263 || s->codec_id==AV_CODEC_ID_H263P || s->codec_id == AV_CODEC_ID_H263I))
 612         s->gob_index = ff_h263_get_gob_height(s);
 613
 614     // for skipping the frame
 615     s->current_picture.f.pict_type = s->pict_type;
 616     s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
 617
 618     /* skip B-frames if we don't have reference frames */
 619     if (s->last_picture_ptr == NULL &&
 620         (s->pict_type == AV_PICTURE_TYPE_B || s->droppable))
 621         return get_consumed_bytes(s, buf_size);
 622     if(   (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==AV_PICTURE_TYPE_B)
 623        || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=AV_PICTURE_TYPE_I)
 624        ||  avctx->skip_frame >= AVDISCARD_ALL)
 625         return get_consumed_bytes(s, buf_size);
 626
 627     if(s->next_p_frame_damaged){
 628         if(s->pict_type==AV_PICTURE_TYPE_B)
 629             return get_consumed_bytes(s, buf_size);
 630         else
 631             s->next_p_frame_damaged=0;
 632     }
 633
 634     if((!s->no_rounding) || s->pict_type==AV_PICTURE_TYPE_B){
 635         s->me.qpel_put= s->dsp.put_qpel_pixels_tab;
 636         s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
 637     }else{
 638         s->me.qpel_put= s->dsp.put_no_rnd_qpel_pixels_tab;
 639         s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
 640     }
 641
 642     if ((ret = ff_MPV_frame_start(s, avctx)) < 0)
 643         return ret;
 644
 645     if (!s->divx_packed && !avctx->hwaccel)
 646         ff_thread_finish_setup(avctx);
 647
 648     if (CONFIG_MPEG4_VDPAU_DECODER && (s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)) {
 649         ff_vdpau_mpeg4_decode_picture(s, s->gb.buffer, s->gb.buffer_end - s->gb.buffer);
 650         goto frame_end;
 651     }
 652
 653     if (avctx->hwaccel) {
 654         if ((ret = avctx->hwaccel->start_frame(avctx, s->gb.buffer, s->gb.buffer_end - s->gb.buffer)) < 0)
 655             return ret;
 656     }
 657
 658     ff_mpeg_er_frame_start(s);
 659
 660     //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
 661     //which is not available before ff_MPV_frame_start()
 662     if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5){
 663         ret = ff_wmv2_decode_secondary_picture_header(s);
 664         if(ret<0) return ret;
 665         if(ret==1) goto frame_end;
 666     }
 667
 668     /* decode each macroblock */
 669     s->mb_x=0;
 670     s->mb_y=0;
 671
 672     ret = decode_slice(s);
 673     while(s->mb_y<s->mb_height){
 674         if(s->msmpeg4_version){
 675             if(s->slice_height==0 || s->mb_x!=0 || (s->mb_y%s->slice_height)!=0 || get_bits_left(&s->gb)<0)
 676                 break;
 677         }else{
 678             int prev_x=s->mb_x, prev_y=s->mb_y;
 679             if(ff_h263_resync(s)<0)
 680                 break;
 681             if (prev_y * s->mb_width + prev_x < s->mb_y * s->mb_width + s->mb_x)
 682                 s->er.error_occurred = 1;
 683         }
 684
 685         if(s->msmpeg4_version<4 && s->h263_pred)
 686             ff_mpeg4_clean_buffers(s);
 687
 688         if (decode_slice(s) < 0) ret = AVERROR_INVALIDDATA;
 689     }
 690
 691     if (s->msmpeg4_version && s->msmpeg4_version<4 && s->pict_type==AV_PICTURE_TYPE_I)
 692         if(!CONFIG_MSMPEG4_DECODER || ff_msmpeg4_decode_ext_header(s, buf_size) < 0){
 693             s->er.error_status_table[s->mb_num - 1] = ER_MB_ERROR;
 694         }
 695
 696     av_assert1(s->bitstream_buffer_size==0);
 697 frame_end:
 698     ff_er_frame_end(&s->er);
 699
 700     if (avctx->hwaccel) {
 701         if ((ret = avctx->hwaccel->end_frame(avctx)) < 0)
 702             return ret;
 703     }
 704
 705     ff_MPV_frame_end(s);
 706
 707     /* divx 5.01+ bitstream reorder stuff */
 708     /* Since this clobbers the input buffer and hwaccel codecs still need the
 709      * data during hwaccel->end_frame we should not do this any earlier */
 710     if(s->codec_id==AV_CODEC_ID_MPEG4 && s->divx_packed){
 711         int current_pos= s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb)>>3);
 712         int startcode_found=0;
 713
 714         if(buf_size - current_pos > 7){
 715             int i;
 716             for(i=current_pos; i<buf_size-4; i++){
 717                 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
 718                     startcode_found=!(buf[i+4]&0x40);
 719                     break;
 720                 }
 721             }
 722         }
 723
 724         if(startcode_found){
 725             av_fast_malloc(
 726                 &s->bitstream_buffer,
 727                 &s->allocated_bitstream_buffer_size,
 728                 buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
 729             if (!s->bitstream_buffer)
 730                 return AVERROR(ENOMEM);
 731             memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
 732             s->bitstream_buffer_size= buf_size - current_pos;
 733         }
 734     }
 735
 736     if (!s->divx_packed && avctx->hwaccel)
 737         ff_thread_finish_setup(avctx);
 738
 739     av_assert1(s->current_picture.f.pict_type == s->current_picture_ptr->f.pict_type);
 740     av_assert1(s->current_picture.f.pict_type == s->pict_type);
 741     if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
 742         if ((ret = av_frame_ref(pict, &s->current_picture_ptr->f)) < 0)
 743             return ret;
 744         ff_print_debug_info(s, s->current_picture_ptr, pict);
 745         ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG1);
 746     } else if (s->last_picture_ptr != NULL) {
 747         if ((ret = av_frame_ref(pict, &s->last_picture_ptr->f)) < 0)
 748             return ret;
 749         ff_print_debug_info(s, s->last_picture_ptr, pict);
 750         ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG1);
 751     }
 752
 753     if(s->last_picture_ptr || s->low_delay){
 754         if (   pict->format == AV_PIX_FMT_YUV420P
 755             && (s->codec_tag == AV_RL32("GEOV") || s->codec_tag == AV_RL32("GEOX"))) {
 756             int x, y, p;
 757             av_frame_make_writable(pict);
 758             for (p=0; p<3; p++) {
 759                 int w = FF_CEIL_RSHIFT(pict-> width, !!p);
 760                 int h = FF_CEIL_RSHIFT(pict->height, !!p);
 761                 int linesize = pict->linesize[p];
 762                 for (y=0; y<(h>>1); y++)
 763                     for (x=0; x<w; x++)
 764                         FFSWAP(int,
 765                                pict->data[p][x + y*linesize],
 766                                pict->data[p][x + (h-1-y)*linesize]);
 767             }
 768         }
 769         *got_frame = 1;
 770     }
 771
 772     return (ret && (avctx->err_recognition & AV_EF_EXPLODE))?ret:get_consumed_bytes(s, buf_size);
 773 }
 774
 775 const enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[] = {
 776 #if CONFIG_VAAPI
 777     AV_PIX_FMT_VAAPI_VLD,
 778 #endif
 779 #if CONFIG_VDPAU
 780     AV_PIX_FMT_VDPAU,
 781 #endif
 782     AV_PIX_FMT_YUV420P,
 783     AV_PIX_FMT_NONE
 784 };
 785
 786 AVCodec ff_h263_decoder = {
 787     .name           = "h263",
 788     .long_name      = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
 789     .type           = AVMEDIA_TYPE_VIDEO,
 790     .id             = AV_CODEC_ID_H263,
 791     .priv_data_size = sizeof(MpegEncContext),
 792     .init           = ff_h263_decode_init,
 793     .close          = ff_h263_decode_end,
 794     .decode         = ff_h263_decode_frame,
 795     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
 796                       CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
 797     .flush          = ff_mpeg_flush,
 798     .max_lowres     = 3,
 799     .pix_fmts       = ff_h263_hwaccel_pixfmt_list_420,
 800 };
 801
 802 AVCodec ff_h263p_decoder = {
 803     .name           = "h263p",
 804     .long_name      = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
 805     .type           = AVMEDIA_TYPE_VIDEO,
 806     .id             = AV_CODEC_ID_H263P,
 807     .priv_data_size = sizeof(MpegEncContext),
 808     .init           = ff_h263_decode_init,
 809     .close          = ff_h263_decode_end,
 810     .decode         = ff_h263_decode_frame,
 811     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
 812                       CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
 813     .flush          = ff_mpeg_flush,
 814     .max_lowres     = 3,
 815     .pix_fmts       = ff_h263_hwaccel_pixfmt_list_420,
 816 };