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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     /* for h263, we allocate the images after having read the header */
 117     if (avctx->codec->id != AV_CODEC_ID_H263 && avctx->codec->id != AV_CODEC_ID_H263P && avctx->codec->id != AV_CODEC_ID_MPEG4)
 118         if ((ret = ff_MPV_common_init(s)) < 0)
 119             return ret;
 120
 121         ff_h263_decode_init_vlc();
 122
 123     return 0;
 124 }
 125
 126 av_cold int ff_h263_decode_end(AVCodecContext *avctx)
 127 {
 128     MpegEncContext *s = avctx->priv_data;
 129
 130     ff_MPV_common_end(s);
 131     return 0;
 132 }
 133
 134 /**
 135  * Return the number of bytes consumed for building the current frame.
 136  */
 137 static int get_consumed_bytes(MpegEncContext *s, int buf_size){
 138     int pos= (get_bits_count(&s->gb)+7)>>3;
 139
 140     if(s->divx_packed || s->avctx->hwaccel){
 141         //we would have to scan through the whole buf to handle the weird reordering ...
 142         return buf_size;
 143     }else if(s->flags&CODEC_FLAG_TRUNCATED){
 144         pos -= s->parse_context.last_index;
 145         if(pos<0) pos=0; // padding is not really read so this might be -1
 146         return pos;
 147     }else{
 148         if(pos==0) pos=1; //avoid infinite loops (i doubt that is needed but ...)
 149         if(pos+10>buf_size) pos=buf_size; // oops ;)
 150
 151         return pos;
 152     }
 153 }
 154
 155 static int decode_slice(MpegEncContext *s){
 156     const int part_mask= s->partitioned_frame ? (ER_AC_END|ER_AC_ERROR) : 0x7F;
 157     const int mb_size= 16>>s->avctx->lowres;
 158     int ret;
 159
 160     s->last_resync_gb= s->gb;
 161     s->first_slice_line= 1;
 162
 163     s->resync_mb_x= s->mb_x;
 164     s->resync_mb_y= s->mb_y;
 165
 166     ff_set_qscale(s, s->qscale);
 167
 168     if (s->avctx->hwaccel) {
 169         const uint8_t *start= s->gb.buffer + get_bits_count(&s->gb)/8;
 170         const uint8_t *end  = ff_h263_find_resync_marker(s, start + 1, s->gb.buffer_end);
 171         skip_bits_long(&s->gb, 8*(end - start));
 172         return s->avctx->hwaccel->decode_slice(s->avctx, start, end - start);
 173     }
 174
 175     if(s->partitioned_frame){
 176         const int qscale= s->qscale;
 177
 178         if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4){
 179             if ((ret = ff_mpeg4_decode_partitions(s)) < 0)
 180                 return ret;
 181         }
 182
 183         /* restore variables which were modified */
 184         s->first_slice_line=1;
 185         s->mb_x= s->resync_mb_x;
 186         s->mb_y= s->resync_mb_y;
 187         ff_set_qscale(s, qscale);
 188     }
 189
 190     for(; s->mb_y < s->mb_height; s->mb_y++) {
 191         /* per-row end of slice checks */
 192         if(s->msmpeg4_version){
 193             if(s->resync_mb_y + s->slice_height == s->mb_y){
 194                 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_MB_END);
 195
 196                 return 0;
 197             }
 198         }
 199
 200         if(s->msmpeg4_version==1){
 201             s->last_dc[0]=
 202             s->last_dc[1]=
 203             s->last_dc[2]= 128;
 204         }
 205
 206         ff_init_block_index(s);
 207         for(; s->mb_x < s->mb_width; s->mb_x++) {
 208             int ret;
 209
 210             ff_update_block_index(s);
 211
 212             if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
 213                 s->first_slice_line=0;
 214             }
 215
 216             /* DCT & quantize */
 217
 218             s->mv_dir = MV_DIR_FORWARD;
 219             s->mv_type = MV_TYPE_16X16;
 220 //            s->mb_skipped = 0;
 221             av_dlog(s, "%d %d %06X\n",
 222                     ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
 223             ret= s->decode_mb(s, s->block);
 224
 225             if (s->pict_type!=AV_PICTURE_TYPE_B)
 226                 ff_h263_update_motion_val(s);
 227
 228             if(ret<0){
 229                 const int xy= s->mb_x + s->mb_y*s->mb_stride;
 230                 if(ret==SLICE_END){
 231                     ff_MPV_decode_mb(s, s->block);
 232                     if(s->loop_filter)
 233                         ff_h263_loop_filter(s);
 234
 235                     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);
 236
 237                     s->padding_bug_score--;
 238
 239                     if(++s->mb_x >= s->mb_width){
 240                         s->mb_x=0;
 241                         ff_mpeg_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
 242                         ff_MPV_report_decode_progress(s);
 243                         s->mb_y++;
 244                     }
 245                     return 0;
 246                 }else if(ret==SLICE_NOEND){
 247                     av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy);
 248                     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);
 249                     return AVERROR_INVALIDDATA;
 250                 }
 251                 av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
 252                 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);
 253
 254                 return AVERROR_INVALIDDATA;
 255             }
 256
 257             ff_MPV_decode_mb(s, s->block);
 258             if(s->loop_filter)
 259                 ff_h263_loop_filter(s);
 260         }
 261
 262         ff_mpeg_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
 263         ff_MPV_report_decode_progress(s);
 264
 265         s->mb_x= 0;
 266     }
 267
 268     av_assert1(s->mb_x==0 && s->mb_y==s->mb_height);
 269
 270     if(s->codec_id==AV_CODEC_ID_MPEG4
 271        && (s->workaround_bugs&FF_BUG_AUTODETECT)
 272        && get_bits_left(&s->gb) >= 48
 273        && show_bits(&s->gb, 24)==0x4010
 274        && !s->data_partitioning)
 275         s->padding_bug_score+=32;
 276
 277     /* try to detect the padding bug */
 278     if(      s->codec_id==AV_CODEC_ID_MPEG4
 279        &&   (s->workaround_bugs&FF_BUG_AUTODETECT)
 280        &&    get_bits_left(&s->gb) >=0
 281        &&    get_bits_left(&s->gb) < 137
 282 //       &&   !s->resync_marker
 283        &&   !s->data_partitioning){
 284
 285         const int bits_count= get_bits_count(&s->gb);
 286         const int bits_left = s->gb.size_in_bits - bits_count;
 287
 288         if(bits_left==0){
 289             s->padding_bug_score+=16;
 290         } else if(bits_left != 1){
 291             int v= show_bits(&s->gb, 8);
 292             v|= 0x7F >> (7-(bits_count&7));
 293
 294             if(v==0x7F && bits_left<=8)
 295                 s->padding_bug_score--;
 296             else if(v==0x7F && ((get_bits_count(&s->gb)+8)&8) && bits_left<=16)
 297                 s->padding_bug_score+= 4;
 298             else
 299                 s->padding_bug_score++;
 300         }
 301     }
 302
 303     if(s->workaround_bugs&FF_BUG_AUTODETECT){
 304         if(s->padding_bug_score > -2 && !s->data_partitioning /*&& (s->divx_version>=0 || !s->resync_marker)*/)
 305             s->workaround_bugs |=  FF_BUG_NO_PADDING;
 306         else
 307             s->workaround_bugs &= ~FF_BUG_NO_PADDING;
 308     }
 309
 310     // handle formats which don't have unique end markers
 311     if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
 312         int left= get_bits_left(&s->gb);
 313         int max_extra=7;
 314
 315         /* no markers in M$ crap */
 316         if(s->msmpeg4_version && s->pict_type==AV_PICTURE_TYPE_I)
 317             max_extra+= 17;
 318
 319         /* buggy padding but the frame should still end approximately at the bitstream end */
 320         if((s->workaround_bugs&FF_BUG_NO_PADDING) && (s->err_recognition&(AV_EF_BUFFER|AV_EF_AGGRESSIVE)))
 321             max_extra+= 48;
 322         else if((s->workaround_bugs&FF_BUG_NO_PADDING))
 323             max_extra+= 256*256*256*64;
 324
 325         if(left>max_extra){
 326             av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
 327         }
 328         else if(left<0){
 329             av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
 330         }else
 331             ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_MB_END);
 332
 333         return 0;
 334     }
 335
 336     av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
 337             get_bits_left(&s->gb),
 338             show_bits(&s->gb, 24), s->padding_bug_score);
 339
 340     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);
 341
 342     return AVERROR_INVALIDDATA;
 343 }
 344
 345 int ff_h263_decode_frame(AVCodecContext *avctx,
 346                              void *data, int *got_frame,
 347                              AVPacket *avpkt)
 348 {
 349     const uint8_t *buf = avpkt->data;
 350     int buf_size = avpkt->size;
 351     MpegEncContext *s = avctx->priv_data;
 352     int ret;
 353     AVFrame *pict = data;
 354
 355     s->flags= avctx->flags;
 356     s->flags2= avctx->flags2;
 357
 358     /* no supplementary picture */
 359     if (buf_size == 0) {
 360         /* special case for last picture */
 361         if (s->low_delay==0 && s->next_picture_ptr) {
 362             if ((ret = av_frame_ref(pict, &s->next_picture_ptr->f)) < 0)
 363                 return ret;
 364             s->next_picture_ptr= NULL;
 365
 366             *got_frame = 1;
 367         }
 368
 369         return 0;
 370     }
 371
 372     if(s->flags&CODEC_FLAG_TRUNCATED){
 373         int next;
 374
 375         if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4){
 376             next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
 377         }else if(CONFIG_H263_DECODER && s->codec_id==AV_CODEC_ID_H263){
 378             next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
 379         }else if(CONFIG_H263P_DECODER && s->codec_id==AV_CODEC_ID_H263P){
 380             next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
 381         }else{
 382             av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n");
 383             return AVERROR(EINVAL);
 384         }
 385
 386         if( ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
 387             return buf_size;
 388     }
 389
 390
 391 retry:
 392     if(s->divx_packed && s->bitstream_buffer_size){
 393         int i;
 394         for(i=0; i<buf_size-3; i++){
 395             if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1){
 396                 if(buf[i+3]==0xB0){
 397                     av_log(s->avctx, AV_LOG_WARNING, "Discarding excessive bitstream in packed xvid\n");
 398                     s->bitstream_buffer_size=0;
 399                 }
 400                 break;
 401             }
 402         }
 403     }
 404
 405     if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
 406         init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
 407     }else
 408         init_get_bits(&s->gb, buf, buf_size*8);
 409     s->bitstream_buffer_size=0;
 410
 411     if (!s->context_initialized) {
 412         if ((ret = ff_MPV_common_init(s)) < 0) //we need the idct permutaton for reading a custom matrix
 413             return ret;
 414     }
 415
 416     /* We need to set current_picture_ptr before reading the header,
 417      * otherwise we cannot store anyting in there */
 418     if (s->current_picture_ptr == NULL || s->current_picture_ptr->f.data[0]) {
 419         int i= ff_find_unused_picture(s, 0);
 420         if (i < 0)
 421             return i;
 422         s->current_picture_ptr= &s->picture[i];
 423     }
 424
 425     /* let's go :-) */
 426     if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5) {
 427         ret= ff_wmv2_decode_picture_header(s);
 428     } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
 429         ret = ff_msmpeg4_decode_picture_header(s);
 430     } else if (CONFIG_MPEG4_DECODER && s->h263_pred) {
 431         if(s->avctx->extradata_size && s->picture_number==0){
 432             GetBitContext gb;
 433
 434             init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
 435             ret = ff_mpeg4_decode_picture_header(s, &gb);
 436         }
 437         ret = ff_mpeg4_decode_picture_header(s, &s->gb);
 438     } else if (CONFIG_H263I_DECODER && s->codec_id == AV_CODEC_ID_H263I) {
 439         ret = ff_intel_h263_decode_picture_header(s);
 440     } else if (CONFIG_FLV_DECODER && s->h263_flv) {
 441         ret = ff_flv_decode_picture_header(s);
 442     } else {
 443         ret = ff_h263_decode_picture_header(s);
 444     }
 445
 446     if (ret < 0 || ret==FRAME_SKIPPED) {
 447         if (   s->width  != avctx->coded_width
 448             || s->height != avctx->coded_height) {
 449                 av_log(s->avctx, AV_LOG_WARNING, "Reverting picture dimensions change due to header decoding failure\n");
 450                 s->width = avctx->coded_width;
 451                 s->height= avctx->coded_height;
 452         }
 453     }
 454     if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size);
 455
 456     /* skip if the header was thrashed */
 457     if (ret < 0){
 458         av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
 459         return ret;
 460     }
 461
 462     avctx->has_b_frames= !s->low_delay;
 463
 464     if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){
 465         if(s->stream_codec_tag == AV_RL32("XVID") ||
 466            s->codec_tag == AV_RL32("XVID") || s->codec_tag == AV_RL32("XVIX") ||
 467            s->codec_tag == AV_RL32("RMP4") || s->codec_tag == AV_RL32("ZMP4") ||
 468            s->codec_tag == AV_RL32("SIPP")
 469            )
 470             s->xvid_build= 0;
 471 #if 0
 472         if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
 473            && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
 474             s->xvid_build= 0;
 475 #endif
 476     }
 477
 478     if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){
 479         if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
 480             s->divx_version= 400; //divx 4
 481     }
 482
 483     if(s->xvid_build>=0 && s->divx_version>=0){
 484         s->divx_version=
 485         s->divx_build= -1;
 486     }
 487
 488     if(s->workaround_bugs&FF_BUG_AUTODETECT){
 489         if(s->codec_tag == AV_RL32("XVIX"))
 490             s->workaround_bugs|= FF_BUG_XVID_ILACE;
 491
 492         if(s->codec_tag == AV_RL32("UMP4")){
 493             s->workaround_bugs|= FF_BUG_UMP4;
 494         }
 495
 496         if(s->divx_version>=500 && s->divx_build<1814){
 497             s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
 498         }
 499
 500         if(s->divx_version>502 && s->divx_build<1814){
 501             s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
 502         }
 503
 504         if(s->xvid_build<=3U)
 505             s->padding_bug_score= 256*256*256*64;
 506
 507         if(s->xvid_build<=1U)
 508             s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
 509
 510         if(s->xvid_build<=12U)
 511             s->workaround_bugs|= FF_BUG_EDGE;
 512
 513         if(s->xvid_build<=32U)
 514             s->workaround_bugs|= FF_BUG_DC_CLIP;
 515
 516 #define SET_QPEL_FUNC(postfix1, postfix2) \
 517     s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
 518     s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
 519     s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
 520
 521         if(s->lavc_build<4653U)
 522             s->workaround_bugs|= FF_BUG_STD_QPEL;
 523
 524         if(s->lavc_build<4655U)
 525             s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
 526
 527         if(s->lavc_build<4670U){
 528             s->workaround_bugs|= FF_BUG_EDGE;
 529         }
 530
 531         if(s->lavc_build<=4712U)
 532             s->workaround_bugs|= FF_BUG_DC_CLIP;
 533
 534         if(s->divx_version>=0)
 535             s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
 536         if(s->divx_version==501 && s->divx_build==20020416)
 537             s->padding_bug_score= 256*256*256*64;
 538
 539         if(s->divx_version<500U){
 540             s->workaround_bugs|= FF_BUG_EDGE;
 541         }
 542
 543         if(s->divx_version>=0)
 544             s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
 545 #if 0
 546         if(s->divx_version==500)
 547             s->padding_bug_score= 256*256*256*64;
 548
 549         /* very ugly XVID padding bug detection FIXME/XXX solve this differently
 550          * Let us hope this at least works.
 551          */
 552         if(   s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==-1
 553            && s->codec_id==AV_CODEC_ID_MPEG4 && s->vo_type==0)
 554             s->workaround_bugs|= FF_BUG_NO_PADDING;
 555
 556         if(s->lavc_build<4609U) //FIXME not sure about the version num but a 4609 file seems ok
 557             s->workaround_bugs|= FF_BUG_NO_PADDING;
 558 #endif
 559     }
 560
 561     if(s->workaround_bugs& FF_BUG_STD_QPEL){
 562         SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
 563         SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
 564         SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
 565         SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
 566         SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
 567         SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
 568
 569         SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
 570         SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
 571         SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
 572         SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
 573         SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
 574         SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
 575     }
 576
 577     if(avctx->debug & FF_DEBUG_BUGS)
 578         av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
 579                s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
 580                s->divx_packed ? "p" : "");
 581
 582 #if HAVE_MMX
 583     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)) {
 584         avctx->idct_algo= FF_IDCT_XVIDMMX;
 585         ff_dct_common_init(s);
 586         goto retry;
 587     }
 588 #endif
 589
 590         /* After H263 & mpeg4 header decode we have the height, width,*/
 591         /* and other parameters. So then we could init the picture   */
 592         /* FIXME: By the way H263 decoder is evolving it should have */
 593         /* an H263EncContext                                         */
 594
 595     if ((!avctx->coded_width || !avctx->coded_height) && 0) {
 596         ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
 597
 598         s->parse_context.buffer=0;
 599         ff_MPV_common_end(s);
 600         s->parse_context= pc;
 601         avcodec_set_dimensions(avctx, s->width, s->height);
 602
 603         goto retry;
 604     }
 605
 606     if (s->width  != avctx->coded_width  ||
 607         s->height != avctx->coded_height ||
 608         s->context_reinit) {
 609         /* H.263 could change picture size any time */
 610         s->context_reinit = 0;
 611
 612         avcodec_set_dimensions(avctx, s->width, s->height);
 613
 614         if ((ret = ff_MPV_common_frame_size_change(s)))
 615             return ret;
 616     }
 617
 618     if((s->codec_id==AV_CODEC_ID_H263 || s->codec_id==AV_CODEC_ID_H263P || s->codec_id == AV_CODEC_ID_H263I))
 619         s->gob_index = ff_h263_get_gob_height(s);
 620
 621     // for skipping the frame
 622     s->current_picture.f.pict_type = s->pict_type;
 623     s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
 624
 625     /* skip B-frames if we don't have reference frames */
 626     if (s->last_picture_ptr == NULL &&
 627         (s->pict_type == AV_PICTURE_TYPE_B || s->droppable))
 628         return get_consumed_bytes(s, buf_size);
 629     if(   (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==AV_PICTURE_TYPE_B)
 630        || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=AV_PICTURE_TYPE_I)
 631        ||  avctx->skip_frame >= AVDISCARD_ALL)
 632         return get_consumed_bytes(s, buf_size);
 633
 634     if(s->next_p_frame_damaged){
 635         if(s->pict_type==AV_PICTURE_TYPE_B)
 636             return get_consumed_bytes(s, buf_size);
 637         else
 638             s->next_p_frame_damaged=0;
 639     }
 640
 641     if((!s->no_rounding) || s->pict_type==AV_PICTURE_TYPE_B){
 642         s->me.qpel_put= s->dsp.put_qpel_pixels_tab;
 643         s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
 644     }else{
 645         s->me.qpel_put= s->dsp.put_no_rnd_qpel_pixels_tab;
 646         s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
 647     }
 648
 649     if ((ret = ff_MPV_frame_start(s, avctx)) < 0)
 650         return ret;
 651
 652     if (!s->divx_packed && !avctx->hwaccel)
 653         ff_thread_finish_setup(avctx);
 654
 655     if (CONFIG_MPEG4_VDPAU_DECODER && (s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)) {
 656         ff_vdpau_mpeg4_decode_picture(s, s->gb.buffer, s->gb.buffer_end - s->gb.buffer);
 657         goto frame_end;
 658     }
 659
 660     if (avctx->hwaccel) {
 661         if ((ret = avctx->hwaccel->start_frame(avctx, s->gb.buffer, s->gb.buffer_end - s->gb.buffer)) < 0)
 662             return ret;
 663     }
 664
 665     ff_mpeg_er_frame_start(s);
 666
 667     //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
 668     //which is not available before ff_MPV_frame_start()
 669     if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5){
 670         ret = ff_wmv2_decode_secondary_picture_header(s);
 671         if(ret<0) return ret;
 672         if(ret==1) goto intrax8_decoded;
 673     }
 674
 675     /* decode each macroblock */
 676     s->mb_x=0;
 677     s->mb_y=0;
 678
 679     ret = decode_slice(s);
 680     while(s->mb_y<s->mb_height){
 681         if(s->msmpeg4_version){
 682             if(s->slice_height==0 || s->mb_x!=0 || (s->mb_y%s->slice_height)!=0 || get_bits_left(&s->gb)<0)
 683                 break;
 684         }else{
 685             int prev_x=s->mb_x, prev_y=s->mb_y;
 686             if(ff_h263_resync(s)<0)
 687                 break;
 688             if (prev_y * s->mb_width + prev_x < s->mb_y * s->mb_width + s->mb_x)
 689                 s->er.error_occurred = 1;
 690         }
 691
 692         if(s->msmpeg4_version<4 && s->h263_pred)
 693             ff_mpeg4_clean_buffers(s);
 694
 695         if (decode_slice(s) < 0) ret = AVERROR_INVALIDDATA;
 696     }
 697
 698     if (s->msmpeg4_version && s->msmpeg4_version<4 && s->pict_type==AV_PICTURE_TYPE_I)
 699         if(!CONFIG_MSMPEG4_DECODER || ff_msmpeg4_decode_ext_header(s, buf_size) < 0){
 700             s->er.error_status_table[s->mb_num - 1] = ER_MB_ERROR;
 701         }
 702
 703     av_assert1(s->bitstream_buffer_size==0);
 704 frame_end:
 705     /* divx 5.01+ bitstream reorder stuff */
 706     if(s->codec_id==AV_CODEC_ID_MPEG4 && s->divx_packed){
 707         int current_pos= s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb)>>3);
 708         int startcode_found=0;
 709
 710         if(buf_size - current_pos > 7){
 711             int i;
 712             for(i=current_pos; i<buf_size-4; i++){
 713                 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
 714                     startcode_found=!(buf[i+4]&0x40);
 715                     break;
 716                 }
 717             }
 718         }
 719
 720         if(startcode_found){
 721             av_fast_malloc(
 722                 &s->bitstream_buffer,
 723                 &s->allocated_bitstream_buffer_size,
 724                 buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
 725             if (!s->bitstream_buffer)
 726                 return AVERROR(ENOMEM);
 727             memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
 728             s->bitstream_buffer_size= buf_size - current_pos;
 729         }
 730     }
 731
 732 intrax8_decoded:
 733     ff_er_frame_end(&s->er);
 734
 735     if (avctx->hwaccel) {
 736         if ((ret = avctx->hwaccel->end_frame(avctx)) < 0)
 737             return ret;
 738     }
 739
 740     ff_MPV_frame_end(s);
 741
 742     if (!s->divx_packed && avctx->hwaccel)
 743         ff_thread_finish_setup(avctx);
 744
 745     av_assert1(s->current_picture.f.pict_type == s->current_picture_ptr->f.pict_type);
 746     av_assert1(s->current_picture.f.pict_type == s->pict_type);
 747     if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
 748         if ((ret = av_frame_ref(pict, &s->current_picture_ptr->f)) < 0)
 749             return ret;
 750         ff_print_debug_info(s, s->current_picture_ptr, pict);
 751         ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG1);
 752     } else if (s->last_picture_ptr != NULL) {
 753         if ((ret = av_frame_ref(pict, &s->last_picture_ptr->f)) < 0)
 754             return ret;
 755         ff_print_debug_info(s, s->last_picture_ptr, pict);
 756         ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG1);
 757     }
 758
 759     if(s->last_picture_ptr || s->low_delay){
 760         *got_frame = 1;
 761     }
 762
 763     return (ret && (avctx->err_recognition & AV_EF_EXPLODE))?ret:get_consumed_bytes(s, buf_size);
 764 }
 765
 766 const enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[] = {
 767 #if CONFIG_VAAPI
 768     AV_PIX_FMT_VAAPI_VLD,
 769 #endif
 770 #if CONFIG_VDPAU
 771     AV_PIX_FMT_VDPAU,
 772 #endif
 773     AV_PIX_FMT_YUV420P,
 774     AV_PIX_FMT_NONE
 775 };
 776
 777 AVCodec ff_h263_decoder = {
 778     .name           = "h263",
 779     .type           = AVMEDIA_TYPE_VIDEO,
 780     .id             = AV_CODEC_ID_H263,
 781     .priv_data_size = sizeof(MpegEncContext),
 782     .init           = ff_h263_decode_init,
 783     .close          = ff_h263_decode_end,
 784     .decode         = ff_h263_decode_frame,
 785     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
 786                       CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
 787     .flush          = ff_mpeg_flush,
 788     .max_lowres     = 3,
 789     .long_name      = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
 790     .pix_fmts       = ff_h263_hwaccel_pixfmt_list_420,
 791 };
 792
 793 AVCodec ff_h263p_decoder = {
 794     .name           = "h263p",
 795     .type           = AVMEDIA_TYPE_VIDEO,
 796     .id             = AV_CODEC_ID_H263P,
 797     .priv_data_size = sizeof(MpegEncContext),
 798     .init           = ff_h263_decode_init,
 799     .close          = ff_h263_decode_end,
 800     .decode         = ff_h263_decode_frame,
 801     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
 802                       CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
 803     .flush          = ff_mpeg_flush,
 804     .max_lowres     = 3,
 805     .long_name      = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
 806     .pix_fmts       = ff_h263_hwaccel_pixfmt_list_420,
 807 };