git.sesse.net Git - ffmpeg/blob - 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
  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 "thread.h"
  40 #include "flv.h"
  41 #include "mpeg4video.h"
  42
  43 av_cold int ff_h263_decode_init(AVCodecContext *avctx)
  44 {
  45     MpegEncContext *s = avctx->priv_data;
  46     int ret;
  47
  48     s->avctx = avctx;
  49     s->out_format = FMT_H263;
  50
  51     s->width  = avctx->coded_width;
  52     s->height = avctx->coded_height;
  53     s->workaround_bugs= avctx->workaround_bugs;
  54
  55     // set defaults
  56     ff_MPV_decode_defaults(s);
  57     s->quant_precision=5;
  58     s->decode_mb= ff_h263_decode_mb;
  59     s->low_delay= 1;
  60     if (avctx->codec->id == AV_CODEC_ID_MSS2)
  61         avctx->pix_fmt = AV_PIX_FMT_YUV420P;
  62     else
  63         avctx->pix_fmt = avctx->get_format(avctx, avctx->codec->pix_fmts);
  64     s->unrestricted_mv= 1;
  65
  66     /* select sub codec */
  67     switch(avctx->codec->id) {
  68     case AV_CODEC_ID_H263:
  69     case AV_CODEC_ID_H263P:
  70         s->unrestricted_mv= 0;
  71         avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
  72         break;
  73     case AV_CODEC_ID_MPEG4:
  74         break;
  75     case AV_CODEC_ID_MSMPEG4V1:
  76         s->h263_pred = 1;
  77         s->msmpeg4_version=1;
  78         break;
  79     case AV_CODEC_ID_MSMPEG4V2:
  80         s->h263_pred = 1;
  81         s->msmpeg4_version=2;
  82         break;
  83     case AV_CODEC_ID_MSMPEG4V3:
  84         s->h263_pred = 1;
  85         s->msmpeg4_version=3;
  86         break;
  87     case AV_CODEC_ID_WMV1:
  88         s->h263_pred = 1;
  89         s->msmpeg4_version=4;
  90         break;
  91     case AV_CODEC_ID_WMV2:
  92         s->h263_pred = 1;
  93         s->msmpeg4_version=5;
  94         break;
  95     case AV_CODEC_ID_VC1:
  96     case AV_CODEC_ID_WMV3:
  97     case AV_CODEC_ID_VC1IMAGE:
  98     case AV_CODEC_ID_WMV3IMAGE:
  99     case AV_CODEC_ID_MSS2:
 100         s->h263_pred = 1;
 101         s->msmpeg4_version=6;
 102         avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
 103         break;
 104     case AV_CODEC_ID_H263I:
 105         break;
 106     case AV_CODEC_ID_FLV1:
 107         s->h263_flv = 1;
 108         break;
 109     default:
 110         return AVERROR(EINVAL);
 111     }
 112     s->codec_id= avctx->codec->id;
 113     avctx->hwaccel= ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
 114
 115     /* for h263, we allocate the images after having read the header */
 116     if (avctx->codec->id != AV_CODEC_ID_H263 && avctx->codec->id != AV_CODEC_ID_H263P && avctx->codec->id != AV_CODEC_ID_MPEG4)
 117         if ((ret = ff_MPV_common_init(s)) < 0)
 118             return ret;
 119
 120         ff_h263_decode_init_vlc();
 121
 122     return 0;
 123 }
 124
 125 av_cold int ff_h263_decode_end(AVCodecContext *avctx)
 126 {
 127     MpegEncContext *s = avctx->priv_data;
 128
 129     ff_MPV_common_end(s);
 130     return 0;
 131 }
 132
 133 /**
 134  * Return the number of bytes consumed for building the current frame.
 135  */
 136 static int get_consumed_bytes(MpegEncContext *s, int buf_size){
 137     int pos= (get_bits_count(&s->gb)+7)>>3;
 138
 139     if(s->divx_packed || s->avctx->hwaccel){
 140         //we would have to scan through the whole buf to handle the weird reordering ...
 141         return buf_size;
 142     }else if(s->flags&CODEC_FLAG_TRUNCATED){
 143         pos -= s->parse_context.last_index;
 144         if(pos<0) pos=0; // padding is not really read so this might be -1
 145         return pos;
 146     }else{
 147         if(pos==0) pos=1; //avoid infinite loops (i doubt that is needed but ...)
 148         if(pos+10>buf_size) pos=buf_size; // oops ;)
 149
 150         return pos;
 151     }
 152 }
 153
 154 static int decode_slice(MpegEncContext *s){
 155     const int part_mask= s->partitioned_frame ? (ER_AC_END|ER_AC_ERROR) : 0x7F;
 156     const int mb_size= 16>>s->avctx->lowres;
 157     int ret;
 158
 159     s->last_resync_gb= s->gb;
 160     s->first_slice_line= 1;
 161
 162     s->resync_mb_x= s->mb_x;
 163     s->resync_mb_y= s->mb_y;
 164
 165     ff_set_qscale(s, s->qscale);
 166
 167     if (s->avctx->hwaccel) {
 168         const uint8_t *start= s->gb.buffer + get_bits_count(&s->gb)/8;
 169         const uint8_t *end  = ff_h263_find_resync_marker(s, start + 1, s->gb.buffer_end);
 170         skip_bits_long(&s->gb, 8*(end - start));
 171         return s->avctx->hwaccel->decode_slice(s->avctx, start, end - start);
 172     }
 173
 174     if(s->partitioned_frame){
 175         const int qscale= s->qscale;
 176
 177         if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4){
 178             if ((ret = ff_mpeg4_decode_partitions(s)) < 0)
 179                 return ret;
 180         }
 181
 182         /* restore variables which were modified */
 183         s->first_slice_line=1;
 184         s->mb_x= s->resync_mb_x;
 185         s->mb_y= s->resync_mb_y;
 186         ff_set_qscale(s, qscale);
 187     }
 188
 189     for(; s->mb_y < s->mb_height; s->mb_y++) {
 190         /* per-row end of slice checks */
 191         if(s->msmpeg4_version){
 192             if(s->resync_mb_y + s->slice_height == s->mb_y){
 193                 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_MB_END);
 194
 195                 return 0;
 196             }
 197         }
 198
 199         if(s->msmpeg4_version==1){
 200             s->last_dc[0]=
 201             s->last_dc[1]=
 202             s->last_dc[2]= 128;
 203         }
 204
 205         ff_init_block_index(s);
 206         for(; s->mb_x < s->mb_width; s->mb_x++) {
 207             int ret;
 208
 209             ff_update_block_index(s);
 210
 211             if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
 212                 s->first_slice_line=0;
 213             }
 214
 215             /* DCT & quantize */
 216
 217             s->mv_dir = MV_DIR_FORWARD;
 218             s->mv_type = MV_TYPE_16X16;
 219 //            s->mb_skipped = 0;
 220             av_dlog(s, "%d %d %06X\n",
 221                     ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
 222             ret= s->decode_mb(s, s->block);
 223
 224             if (s->pict_type!=AV_PICTURE_TYPE_B)
 225                 ff_h263_update_motion_val(s);
 226
 227             if(ret<0){
 228                 const int xy= s->mb_x + s->mb_y*s->mb_stride;
 229                 if(ret==SLICE_END){
 230                     ff_MPV_decode_mb(s, s->block);
 231                     if(s->loop_filter)
 232                         ff_h263_loop_filter(s);
 233
 234                     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);
 235
 236                     s->padding_bug_score--;
 237
 238                     if(++s->mb_x >= s->mb_width){
 239                         s->mb_x=0;
 240                         ff_mpeg_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
 241                         ff_MPV_report_decode_progress(s);
 242                         s->mb_y++;
 243                     }
 244                     return 0;
 245                 }else if(ret==SLICE_NOEND){
 246                     av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy);
 247                     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);
 248                     return AVERROR_INVALIDDATA;
 249                 }
 250                 av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
 251                 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);
 252
 253                 return AVERROR_INVALIDDATA;
 254             }
 255
 256             ff_MPV_decode_mb(s, s->block);
 257             if(s->loop_filter)
 258                 ff_h263_loop_filter(s);
 259         }
 260
 261         ff_mpeg_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
 262         ff_MPV_report_decode_progress(s);
 263
 264         s->mb_x= 0;
 265     }
 266
 267     av_assert1(s->mb_x==0 && s->mb_y==s->mb_height);
 268
 269     if(s->codec_id==AV_CODEC_ID_MPEG4
 270        && (s->workaround_bugs&FF_BUG_AUTODETECT)
 271        && get_bits_left(&s->gb) >= 48
 272        && show_bits(&s->gb, 24)==0x4010
 273        && !s->data_partitioning)
 274         s->padding_bug_score+=32;
 275
 276     /* try to detect the padding bug */
 277     if(      s->codec_id==AV_CODEC_ID_MPEG4
 278        &&   (s->workaround_bugs&FF_BUG_AUTODETECT)
 279        &&    get_bits_left(&s->gb) >=0
 280        &&    get_bits_left(&s->gb) < 137
 281 //       &&   !s->resync_marker
 282        &&   !s->data_partitioning){
 283
 284         const int bits_count= get_bits_count(&s->gb);
 285         const int bits_left = s->gb.size_in_bits - bits_count;
 286
 287         if(bits_left==0){
 288             s->padding_bug_score+=16;
 289         } else if(bits_left != 1){
 290             int v= show_bits(&s->gb, 8);
 291             v|= 0x7F >> (7-(bits_count&7));
 292
 293             if(v==0x7F && bits_left<=8)
 294                 s->padding_bug_score--;
 295             else if(v==0x7F && ((get_bits_count(&s->gb)+8)&8) && bits_left<=16)
 296                 s->padding_bug_score+= 4;
 297             else
 298                 s->padding_bug_score++;
 299         }
 300     }
 301
 302     if(s->workaround_bugs&FF_BUG_AUTODETECT){
 303         if(s->padding_bug_score > -2 && !s->data_partitioning /*&& (s->divx_version>=0 || !s->resync_marker)*/)
 304             s->workaround_bugs |=  FF_BUG_NO_PADDING;
 305         else
 306             s->workaround_bugs &= ~FF_BUG_NO_PADDING;
 307     }
 308
 309     // handle formats which don't have unique end markers
 310     if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
 311         int left= get_bits_left(&s->gb);
 312         int max_extra=7;
 313
 314         /* no markers in M$ crap */
 315         if(s->msmpeg4_version && s->pict_type==AV_PICTURE_TYPE_I)
 316             max_extra+= 17;
 317
 318         /* buggy padding but the frame should still end approximately at the bitstream end */
 319         if((s->workaround_bugs&FF_BUG_NO_PADDING) && (s->err_recognition&(AV_EF_BUFFER|AV_EF_AGGRESSIVE)))
 320             max_extra+= 48;
 321         else if((s->workaround_bugs&FF_BUG_NO_PADDING))
 322             max_extra+= 256*256*256*64;
 323
 324         if(left>max_extra){
 325             av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
 326         }
 327         else if(left<0){
 328             av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
 329         }else
 330             ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_MB_END);
 331
 332         return 0;
 333     }
 334
 335     av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
 336             get_bits_left(&s->gb),
 337             show_bits(&s->gb, 24), s->padding_bug_score);
 338
 339     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);
 340
 341     return AVERROR_INVALIDDATA;
 342 }
 343
 344 int ff_h263_decode_frame(AVCodecContext *avctx,
 345                              void *data, int *got_frame,
 346                              AVPacket *avpkt)
 347 {
 348     const uint8_t *buf = avpkt->data;
 349     int buf_size = avpkt->size;
 350     MpegEncContext *s = avctx->priv_data;
 351     int ret;
 352     AVFrame *pict = data;
 353
 354     s->flags= avctx->flags;
 355     s->flags2= avctx->flags2;
 356
 357     /* no supplementary picture */
 358     if (buf_size == 0) {
 359         /* special case for last picture */
 360         if (s->low_delay==0 && s->next_picture_ptr) {
 361             if ((ret = av_frame_ref(pict, &s->next_picture_ptr->f)) < 0)
 362                 return ret;
 363             s->next_picture_ptr= NULL;
 364
 365             *got_frame = 1;
 366         }
 367
 368         return 0;
 369     }
 370
 371     if(s->flags&CODEC_FLAG_TRUNCATED){
 372         int next;
 373
 374         if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4){
 375             next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
 376         }else if(CONFIG_H263_DECODER && s->codec_id==AV_CODEC_ID_H263){
 377             next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
 378         }else if(CONFIG_H263P_DECODER && s->codec_id==AV_CODEC_ID_H263P){
 379             next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
 380         }else{
 381             av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n");
 382             return AVERROR(EINVAL);
 383         }
 384
 385         if( ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
 386             return buf_size;
 387     }
 388
 389
 390 retry:
 391     if(s->divx_packed && s->bitstream_buffer_size){
 392         int i;
 393         for(i=0; i<buf_size-3; i++){
 394             if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1){
 395                 if(buf[i+3]==0xB0){
 396                     av_log(s->avctx, AV_LOG_WARNING, "Discarding excessive bitstream in packed xvid\n");
 397                     s->bitstream_buffer_size=0;
 398                 }
 399                 break;
 400             }
 401         }
 402     }
 403
 404     if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
 405         init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
 406     }else
 407         init_get_bits(&s->gb, buf, buf_size*8);
 408     s->bitstream_buffer_size=0;
 409
 410     if (!s->context_initialized) {
 411         if ((ret = ff_MPV_common_init(s)) < 0) //we need the idct permutaton for reading a custom matrix
 412             return ret;
 413     }
 414
 415     /* We need to set current_picture_ptr before reading the header,
 416      * otherwise we cannot store anyting in there */
 417     if (s->current_picture_ptr == NULL || s->current_picture_ptr->f.data[0]) {
 418         int i= ff_find_unused_picture(s, 0);
 419         if (i < 0)
 420             return i;
 421         s->current_picture_ptr= &s->picture[i];
 422     }
 423
 424     /* let's go :-) */
 425     if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5) {
 426         ret= ff_wmv2_decode_picture_header(s);
 427     } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
 428         ret = ff_msmpeg4_decode_picture_header(s);
 429     } else if (CONFIG_MPEG4_DECODER && s->h263_pred) {
 430         if(s->avctx->extradata_size && s->picture_number==0){
 431             GetBitContext gb;
 432
 433             init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
 434             ret = ff_mpeg4_decode_picture_header(s, &gb);
 435         }
 436         ret = ff_mpeg4_decode_picture_header(s, &s->gb);
 437     } else if (CONFIG_H263I_DECODER && s->codec_id == AV_CODEC_ID_H263I) {
 438         ret = ff_intel_h263_decode_picture_header(s);
 439     } else if (CONFIG_FLV_DECODER && s->h263_flv) {
 440         ret = ff_flv_decode_picture_header(s);
 441     } else {
 442         ret = ff_h263_decode_picture_header(s);
 443     }
 444
 445     if (ret < 0 || ret==FRAME_SKIPPED) {
 446         if (   s->width  != avctx->coded_width
 447             || s->height != avctx->coded_height) {
 448                 av_log(s->avctx, AV_LOG_WARNING, "Reverting picture dimensions change due to header decoding failure\n");
 449                 s->width = avctx->coded_width;
 450                 s->height= avctx->coded_height;
 451         }
 452     }
 453     if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size);
 454
 455     /* skip if the header was thrashed */
 456     if (ret < 0){
 457         av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
 458         return ret;
 459     }
 460
 461     avctx->has_b_frames= !s->low_delay;
 462
 463     if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){
 464         if(s->stream_codec_tag == AV_RL32("XVID") ||
 465            s->codec_tag == AV_RL32("XVID") || s->codec_tag == AV_RL32("XVIX") ||
 466            s->codec_tag == AV_RL32("RMP4") || s->codec_tag == AV_RL32("ZMP4") ||
 467            s->codec_tag == AV_RL32("SIPP")
 468            )
 469             s->xvid_build= 0;
 470 #if 0
 471         if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
 472            && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
 473             s->xvid_build= 0;
 474 #endif
 475     }
 476
 477     if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){
 478         if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
 479             s->divx_version= 400; //divx 4
 480     }
 481
 482     if(s->xvid_build>=0 && s->divx_version>=0){
 483         s->divx_version=
 484         s->divx_build= -1;
 485     }
 486
 487     if(s->workaround_bugs&FF_BUG_AUTODETECT){
 488         if(s->codec_tag == AV_RL32("XVIX"))
 489             s->workaround_bugs|= FF_BUG_XVID_ILACE;
 490
 491         if(s->codec_tag == AV_RL32("UMP4")){
 492             s->workaround_bugs|= FF_BUG_UMP4;
 493         }
 494
 495         if(s->divx_version>=500 && s->divx_build<1814){
 496             s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
 497         }
 498
 499         if(s->divx_version>502 && s->divx_build<1814){
 500             s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
 501         }
 502
 503         if(s->xvid_build<=3U)
 504             s->padding_bug_score= 256*256*256*64;
 505
 506         if(s->xvid_build<=1U)
 507             s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
 508
 509         if(s->xvid_build<=12U)
 510             s->workaround_bugs|= FF_BUG_EDGE;
 511
 512         if(s->xvid_build<=32U)
 513             s->workaround_bugs|= FF_BUG_DC_CLIP;
 514
 515 #define SET_QPEL_FUNC(postfix1, postfix2) \
 516     s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
 517     s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
 518     s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
 519
 520         if(s->lavc_build<4653U)
 521             s->workaround_bugs|= FF_BUG_STD_QPEL;
 522
 523         if(s->lavc_build<4655U)
 524             s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
 525
 526         if(s->lavc_build<4670U){
 527             s->workaround_bugs|= FF_BUG_EDGE;
 528         }
 529
 530         if(s->lavc_build<=4712U)
 531             s->workaround_bugs|= FF_BUG_DC_CLIP;
 532
 533         if(s->divx_version>=0)
 534             s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
 535         if(s->divx_version==501 && s->divx_build==20020416)
 536             s->padding_bug_score= 256*256*256*64;
 537
 538         if(s->divx_version<500U){
 539             s->workaround_bugs|= FF_BUG_EDGE;
 540         }
 541
 542         if(s->divx_version>=0)
 543             s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
 544 #if 0
 545         if(s->divx_version==500)
 546             s->padding_bug_score= 256*256*256*64;
 547
 548         /* very ugly XVID padding bug detection FIXME/XXX solve this differently
 549          * Let us hope this at least works.
 550          */
 551         if(   s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==-1
 552            && s->codec_id==AV_CODEC_ID_MPEG4 && s->vo_type==0)
 553             s->workaround_bugs|= FF_BUG_NO_PADDING;
 554
 555         if(s->lavc_build<4609U) //FIXME not sure about the version num but a 4609 file seems ok
 556             s->workaround_bugs|= FF_BUG_NO_PADDING;
 557 #endif
 558     }
 559
 560     if(s->workaround_bugs& FF_BUG_STD_QPEL){
 561         SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
 562         SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
 563         SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
 564         SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
 565         SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
 566         SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
 567
 568         SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
 569         SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
 570         SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
 571         SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
 572         SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
 573         SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
 574     }
 575
 576     if(avctx->debug & FF_DEBUG_BUGS)
 577         av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
 578                s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
 579                s->divx_packed ? "p" : "");
 580
 581 #if HAVE_MMX
 582     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)) {
 583         avctx->idct_algo= FF_IDCT_XVIDMMX;
 584         ff_dct_common_init(s);
 585         goto retry;
 586     }
 587 #endif
 588
 589         /* After H263 & mpeg4 header decode we have the height, width,*/
 590         /* and other parameters. So then we could init the picture   */
 591         /* FIXME: By the way H263 decoder is evolving it should have */
 592         /* an H263EncContext                                         */
 593
 594     if ((!avctx->coded_width || !avctx->coded_height) && 0) {
 595         ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
 596
 597         s->parse_context.buffer=0;
 598         ff_MPV_common_end(s);
 599         s->parse_context= pc;
 600         avcodec_set_dimensions(avctx, s->width, s->height);
 601
 602         goto retry;
 603     }
 604
 605     if (s->width  != avctx->coded_width  ||
 606         s->height != avctx->coded_height ||
 607         s->context_reinit) {
 608         /* H.263 could change picture size any time */
 609         s->context_reinit = 0;
 610
 611         avcodec_set_dimensions(avctx, s->width, s->height);
 612
 613         if ((ret = ff_MPV_common_frame_size_change(s)))
 614             return ret;
 615     }
 616
 617     if((s->codec_id==AV_CODEC_ID_H263 || s->codec_id==AV_CODEC_ID_H263P || s->codec_id == AV_CODEC_ID_H263I))
 618         s->gob_index = ff_h263_get_gob_height(s);
 619
 620     // for skipping the frame
 621     s->current_picture.f.pict_type = s->pict_type;
 622     s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
 623
 624     /* skip B-frames if we don't have reference frames */
 625     if (s->last_picture_ptr == NULL &&
 626         (s->pict_type == AV_PICTURE_TYPE_B || s->droppable))
 627         return get_consumed_bytes(s, buf_size);
 628     if(   (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==AV_PICTURE_TYPE_B)
 629        || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=AV_PICTURE_TYPE_I)
 630        ||  avctx->skip_frame >= AVDISCARD_ALL)
 631         return get_consumed_bytes(s, buf_size);
 632
 633     if(s->next_p_frame_damaged){
 634         if(s->pict_type==AV_PICTURE_TYPE_B)
 635             return get_consumed_bytes(s, buf_size);
 636         else
 637             s->next_p_frame_damaged=0;
 638     }
 639
 640     if((!s->no_rounding) || s->pict_type==AV_PICTURE_TYPE_B){
 641         s->me.qpel_put= s->dsp.put_qpel_pixels_tab;
 642         s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
 643     }else{
 644         s->me.qpel_put= s->dsp.put_no_rnd_qpel_pixels_tab;
 645         s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
 646     }
 647
 648     if ((ret = ff_MPV_frame_start(s, avctx)) < 0)
 649         return ret;
 650
 651     if (!s->divx_packed && !avctx->hwaccel)
 652         ff_thread_finish_setup(avctx);
 653
 654     if (avctx->hwaccel) {
 655         if ((ret = avctx->hwaccel->start_frame(avctx, s->gb.buffer, s->gb.buffer_end - s->gb.buffer)) < 0)
 656             return ret;
 657     }
 658
 659     ff_mpeg_er_frame_start(s);
 660
 661     //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
 662     //which is not available before ff_MPV_frame_start()
 663     if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5){
 664         ret = ff_wmv2_decode_secondary_picture_header(s);
 665         if(ret<0) return ret;
 666         if(ret==1) goto intrax8_decoded;
 667     }
 668
 669     /* decode each macroblock */
 670     s->mb_x=0;
 671     s->mb_y=0;
 672
 673     ret = decode_slice(s);
 674     while(s->mb_y<s->mb_height){
 675         if(s->msmpeg4_version){
 676             if(s->slice_height==0 || s->mb_x!=0 || (s->mb_y%s->slice_height)!=0 || get_bits_left(&s->gb)<0)
 677                 break;
 678         }else{
 679             int prev_x=s->mb_x, prev_y=s->mb_y;
 680             if(ff_h263_resync(s)<0)
 681                 break;
 682             if (prev_y * s->mb_width + prev_x < s->mb_y * s->mb_width + s->mb_x)
 683                 s->er.error_occurred = 1;
 684         }
 685
 686         if(s->msmpeg4_version<4 && s->h263_pred)
 687             ff_mpeg4_clean_buffers(s);
 688
 689         if (decode_slice(s) < 0) ret = AVERROR_INVALIDDATA;
 690     }
 691
 692     if (s->msmpeg4_version && s->msmpeg4_version<4 && s->pict_type==AV_PICTURE_TYPE_I)
 693         if(!CONFIG_MSMPEG4_DECODER || ff_msmpeg4_decode_ext_header(s, buf_size) < 0){
 694             s->er.error_status_table[s->mb_num - 1] = ER_MB_ERROR;
 695         }
 696
 697     av_assert1(s->bitstream_buffer_size==0);
 698     /* divx 5.01+ bitstream reorder stuff */
 699     if(s->codec_id==AV_CODEC_ID_MPEG4 && s->divx_packed){
 700         int current_pos= s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb)>>3);
 701         int startcode_found=0;
 702
 703         if(buf_size - current_pos > 7){
 704             int i;
 705             for(i=current_pos; i<buf_size-4; i++){
 706                 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
 707                     startcode_found=!(buf[i+4]&0x40);
 708                     break;
 709                 }
 710             }
 711         }
 712
 713         if(startcode_found){
 714             av_fast_malloc(
 715                 &s->bitstream_buffer,
 716                 &s->allocated_bitstream_buffer_size,
 717                 buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
 718             if (!s->bitstream_buffer)
 719                 return AVERROR(ENOMEM);
 720             memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
 721             s->bitstream_buffer_size= buf_size - current_pos;
 722         }
 723     }
 724
 725 intrax8_decoded:
 726     ff_er_frame_end(&s->er);
 727
 728     if (avctx->hwaccel) {
 729         if ((ret = avctx->hwaccel->end_frame(avctx)) < 0)
 730             return ret;
 731     }
 732
 733     ff_MPV_frame_end(s);
 734
 735     if (!s->divx_packed && avctx->hwaccel)
 736         ff_thread_finish_setup(avctx);
 737
 738     av_assert1(s->current_picture.f.pict_type == s->current_picture_ptr->f.pict_type);
 739     av_assert1(s->current_picture.f.pict_type == s->pict_type);
 740     if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
 741         if ((ret = av_frame_ref(pict, &s->current_picture_ptr->f)) < 0)
 742             return ret;
 743         ff_print_debug_info(s, s->current_picture_ptr, pict);
 744         ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG1);
 745     } else if (s->last_picture_ptr != NULL) {
 746         if ((ret = av_frame_ref(pict, &s->last_picture_ptr->f)) < 0)
 747             return ret;
 748         ff_print_debug_info(s, s->last_picture_ptr, pict);
 749         ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG1);
 750     }
 751
 752     if(s->last_picture_ptr || s->low_delay){
 753         *got_frame = 1;
 754     }
 755
 756     return (ret && (avctx->err_recognition & AV_EF_EXPLODE))?ret:get_consumed_bytes(s, buf_size);
 757 }
 758
 759 const enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[] = {
 760 #if CONFIG_VAAPI
 761     AV_PIX_FMT_VAAPI_VLD,
 762 #endif
 763 #if CONFIG_VDPAU
 764     AV_PIX_FMT_VDPAU,
 765 #endif
 766     AV_PIX_FMT_YUV420P,
 767     AV_PIX_FMT_NONE
 768 };
 769
 770 AVCodec ff_h263_decoder = {
 771     .name           = "h263",
 772     .type           = AVMEDIA_TYPE_VIDEO,
 773     .id             = AV_CODEC_ID_H263,
 774     .priv_data_size = sizeof(MpegEncContext),
 775     .init           = ff_h263_decode_init,
 776     .close          = ff_h263_decode_end,
 777     .decode         = ff_h263_decode_frame,
 778     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
 779                       CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
 780     .flush          = ff_mpeg_flush,
 781     .max_lowres     = 3,
 782     .long_name      = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
 783     .pix_fmts       = ff_h263_hwaccel_pixfmt_list_420,
 784 };
 785
 786 AVCodec ff_h263p_decoder = {
 787     .name           = "h263p",
 788     .type           = AVMEDIA_TYPE_VIDEO,
 789     .id             = AV_CODEC_ID_H263P,
 790     .priv_data_size = sizeof(MpegEncContext),
 791     .init           = ff_h263_decode_init,
 792     .close          = ff_h263_decode_end,
 793     .decode         = ff_h263_decode_frame,
 794     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
 795                       CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
 796     .flush          = ff_mpeg_flush,
 797     .max_lowres     = 3,
 798     .long_name      = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
 799     .pix_fmts       = ff_h263_hwaccel_pixfmt_list_420,
 800 };