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 libavcodec/h263dec.c
  25  * H.263 decoder.
  26  */
  27
  28 #include "internal.h"
  29 #include "avcodec.h"
  30 #include "dsputil.h"
  31 #include "mpegvideo.h"
  32 #include "h263_parser.h"
  33 #include "mpeg4video_parser.h"
  34 #include "msmpeg4.h"
  35 #include "vdpau_internal.h"
  36
  37 //#define DEBUG
  38 //#define PRINT_FRAME_TIME
  39
  40 av_cold int ff_h263_decode_init(AVCodecContext *avctx)
  41 {
  42     MpegEncContext *s = avctx->priv_data;
  43
  44     s->avctx = avctx;
  45     s->out_format = FMT_H263;
  46
  47     s->width  = avctx->coded_width;
  48     s->height = avctx->coded_height;
  49     s->workaround_bugs= avctx->workaround_bugs;
  50
  51     // set defaults
  52     MPV_decode_defaults(s);
  53     s->quant_precision=5;
  54     s->decode_mb= ff_h263_decode_mb;
  55     s->low_delay= 1;
  56     avctx->pix_fmt= avctx->get_format(avctx, avctx->codec->pix_fmts);
  57     s->unrestricted_mv= 1;
  58
  59     /* select sub codec */
  60     switch(avctx->codec->id) {
  61     case CODEC_ID_H263:
  62         s->unrestricted_mv= 0;
  63         avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
  64         break;
  65     case CODEC_ID_MPEG4:
  66         s->decode_mb= ff_mpeg4_decode_mb;
  67         s->time_increment_bits = 4; /* default value for broken headers */
  68         s->h263_pred = 1;
  69         s->low_delay = 0; //default, might be overriden in the vol header during header parsing
  70         avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
  71         break;
  72     case CODEC_ID_MSMPEG4V1:
  73         s->h263_msmpeg4 = 1;
  74         s->h263_pred = 1;
  75         s->msmpeg4_version=1;
  76         break;
  77     case CODEC_ID_MSMPEG4V2:
  78         s->h263_msmpeg4 = 1;
  79         s->h263_pred = 1;
  80         s->msmpeg4_version=2;
  81         break;
  82     case CODEC_ID_MSMPEG4V3:
  83         s->h263_msmpeg4 = 1;
  84         s->h263_pred = 1;
  85         s->msmpeg4_version=3;
  86         break;
  87     case CODEC_ID_WMV1:
  88         s->h263_msmpeg4 = 1;
  89         s->h263_pred = 1;
  90         s->msmpeg4_version=4;
  91         break;
  92     case CODEC_ID_WMV2:
  93         s->h263_msmpeg4 = 1;
  94         s->h263_pred = 1;
  95         s->msmpeg4_version=5;
  96         break;
  97     case CODEC_ID_VC1:
  98     case CODEC_ID_WMV3:
  99         s->h263_msmpeg4 = 1;
 100         s->h263_pred = 1;
 101         s->msmpeg4_version=6;
 102         avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
 103         break;
 104     case CODEC_ID_H263I:
 105         break;
 106     case CODEC_ID_FLV1:
 107         s->h263_flv = 1;
 108         break;
 109     default:
 110         return -1;
 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 != CODEC_ID_H263 && avctx->codec->id != CODEC_ID_MPEG4)
 117         if (MPV_common_init(s) < 0)
 118             return -1;
 119
 120     if (CONFIG_MSMPEG4_DECODER && s->h263_msmpeg4)
 121         ff_msmpeg4_decode_init(s);
 122     else
 123         h263_decode_init_vlc(s);
 124
 125     return 0;
 126 }
 127
 128 av_cold int ff_h263_decode_end(AVCodecContext *avctx)
 129 {
 130     MpegEncContext *s = avctx->priv_data;
 131
 132     MPV_common_end(s);
 133     return 0;
 134 }
 135
 136 /**
 137  * returns the number of bytes consumed for building the current frame
 138  */
 139 static int get_consumed_bytes(MpegEncContext *s, int buf_size){
 140     int pos= (get_bits_count(&s->gb)+7)>>3;
 141
 142     if(s->divx_packed || s->avctx->hwaccel){
 143         //we would have to scan through the whole buf to handle the weird reordering ...
 144         return buf_size;
 145     }else if(s->flags&CODEC_FLAG_TRUNCATED){
 146         pos -= s->parse_context.last_index;
 147         if(pos<0) pos=0; // padding is not really read so this might be -1
 148         return pos;
 149     }else{
 150         if(pos==0) pos=1; //avoid infinite loops (i doubt that is needed but ...)
 151         if(pos+10>buf_size) pos=buf_size; // oops ;)
 152
 153         return pos;
 154     }
 155 }
 156
 157 static int decode_slice(MpegEncContext *s){
 158     const int part_mask= s->partitioned_frame ? (AC_END|AC_ERROR) : 0x7F;
 159     const int mb_size= 16>>s->avctx->lowres;
 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(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(s->codec_id==CODEC_ID_MPEG4){
 179             if(ff_mpeg4_decode_partitions(s) < 0)
 180                 return -1;
 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, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, AC_END|DC_END|MV_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 //printf("%d %d %06X\n", 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!=FF_B_TYPE)
 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                     MPV_decode_mb(s, s->block);
 231                     if(s->loop_filter)
 232                         ff_h263_loop_filter(s);
 233
 234 //printf("%d %d %d %06X\n", s->mb_x, s->mb_y, s->gb.size*8 - get_bits_count(&s->gb), show_bits(&s->gb, 24));
 235                     ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, (AC_END|DC_END|MV_END)&part_mask);
 236
 237                     s->padding_bug_score--;
 238
 239                     if(++s->mb_x >= s->mb_width){
 240                         s->mb_x=0;
 241                         ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
 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, s->resync_mb_x, s->resync_mb_y, s->mb_x+1, s->mb_y, (AC_END|DC_END|MV_END)&part_mask);
 248                     return -1;
 249                 }
 250                 av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
 251                 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, (AC_ERROR|DC_ERROR|MV_ERROR)&part_mask);
 252
 253                 return -1;
 254             }
 255
 256             MPV_decode_mb(s, s->block);
 257             if(s->loop_filter)
 258                 ff_h263_loop_filter(s);
 259         }
 260
 261         ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
 262
 263         s->mb_x= 0;
 264     }
 265
 266     assert(s->mb_x==0 && s->mb_y==s->mb_height);
 267
 268     /* try to detect the padding bug */
 269     if(      s->codec_id==CODEC_ID_MPEG4
 270        &&   (s->workaround_bugs&FF_BUG_AUTODETECT)
 271        &&    get_bits_left(&s->gb) >=0
 272        &&    get_bits_left(&s->gb) < 48
 273 //       &&   !s->resync_marker
 274        &&   !s->data_partitioning){
 275
 276         const int bits_count= get_bits_count(&s->gb);
 277         const int bits_left = s->gb.size_in_bits - bits_count;
 278
 279         if(bits_left==0){
 280             s->padding_bug_score+=16;
 281         } else if(bits_left != 1){
 282             int v= show_bits(&s->gb, 8);
 283             v|= 0x7F >> (7-(bits_count&7));
 284
 285             if(v==0x7F && bits_left<=8)
 286                 s->padding_bug_score--;
 287             else if(v==0x7F && ((get_bits_count(&s->gb)+8)&8) && bits_left<=16)
 288                 s->padding_bug_score+= 4;
 289             else
 290                 s->padding_bug_score++;
 291         }
 292     }
 293
 294     if(s->workaround_bugs&FF_BUG_AUTODETECT){
 295         if(s->padding_bug_score > -2 && !s->data_partitioning /*&& (s->divx_version || !s->resync_marker)*/)
 296             s->workaround_bugs |=  FF_BUG_NO_PADDING;
 297         else
 298             s->workaround_bugs &= ~FF_BUG_NO_PADDING;
 299     }
 300
 301     // handle formats which don't have unique end markers
 302     if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
 303         int left= get_bits_left(&s->gb);
 304         int max_extra=7;
 305
 306         /* no markers in M$ crap */
 307         if(s->msmpeg4_version && s->pict_type==FF_I_TYPE)
 308             max_extra+= 17;
 309
 310         /* buggy padding but the frame should still end approximately at the bitstream end */
 311         if((s->workaround_bugs&FF_BUG_NO_PADDING) && s->error_recognition>=3)
 312             max_extra+= 48;
 313         else if((s->workaround_bugs&FF_BUG_NO_PADDING))
 314             max_extra+= 256*256*256*64;
 315
 316         if(left>max_extra){
 317             av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
 318         }
 319         else if(left<0){
 320             av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
 321         }else
 322             ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, AC_END|DC_END|MV_END);
 323
 324         return 0;
 325     }
 326
 327     av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
 328             get_bits_left(&s->gb),
 329             show_bits(&s->gb, 24), s->padding_bug_score);
 330
 331     ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, (AC_END|DC_END|MV_END)&part_mask);
 332
 333     return -1;
 334 }
 335
 336 int ff_h263_decode_frame(AVCodecContext *avctx,
 337                              void *data, int *data_size,
 338                              AVPacket *avpkt)
 339 {
 340     const uint8_t *buf = avpkt->data;
 341     int buf_size = avpkt->size;
 342     MpegEncContext *s = avctx->priv_data;
 343     int ret;
 344     AVFrame *pict = data;
 345
 346 #ifdef PRINT_FRAME_TIME
 347 uint64_t time= rdtsc();
 348 #endif
 349     s->flags= avctx->flags;
 350     s->flags2= avctx->flags2;
 351
 352     /* no supplementary picture */
 353     if (buf_size == 0) {
 354         /* special case for last picture */
 355         if (s->low_delay==0 && s->next_picture_ptr) {
 356             *pict= *(AVFrame*)s->next_picture_ptr;
 357             s->next_picture_ptr= NULL;
 358
 359             *data_size = sizeof(AVFrame);
 360         }
 361
 362         return 0;
 363     }
 364
 365     if(s->flags&CODEC_FLAG_TRUNCATED){
 366         int next;
 367
 368         if(CONFIG_MPEG4_DECODER && s->codec_id==CODEC_ID_MPEG4){
 369             next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
 370         }else if(CONFIG_H263_DECODER && s->codec_id==CODEC_ID_H263){
 371             next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
 372         }else{
 373             av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n");
 374             return -1;
 375         }
 376
 377         if( ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
 378             return buf_size;
 379     }
 380
 381
 382 retry:
 383
 384     if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
 385         init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
 386     }else
 387         init_get_bits(&s->gb, buf, buf_size*8);
 388     s->bitstream_buffer_size=0;
 389
 390     if (!s->context_initialized) {
 391         if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
 392             return -1;
 393     }
 394
 395     /* We need to set current_picture_ptr before reading the header,
 396      * otherwise we cannot store anyting in there */
 397     if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){
 398         int i= ff_find_unused_picture(s, 0);
 399         s->current_picture_ptr= &s->picture[i];
 400     }
 401
 402     /* let's go :-) */
 403     if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5) {
 404         ret= ff_wmv2_decode_picture_header(s);
 405     } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
 406         ret = msmpeg4_decode_picture_header(s);
 407     } else if (s->h263_pred) {
 408         if(s->avctx->extradata_size && s->picture_number==0){
 409             GetBitContext gb;
 410
 411             init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
 412             ret = ff_mpeg4_decode_picture_header(s, &gb);
 413         }
 414         ret = ff_mpeg4_decode_picture_header(s, &s->gb);
 415     } else if (s->codec_id == CODEC_ID_H263I) {
 416         ret = intel_h263_decode_picture_header(s);
 417     } else if (s->h263_flv) {
 418         ret = flv_h263_decode_picture_header(s);
 419     } else {
 420         ret = h263_decode_picture_header(s);
 421     }
 422
 423     if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size);
 424
 425     /* skip if the header was thrashed */
 426     if (ret < 0){
 427         av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
 428         return -1;
 429     }
 430
 431     avctx->has_b_frames= !s->low_delay;
 432
 433     if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
 434         if(s->stream_codec_tag == AV_RL32("XVID") ||
 435            s->codec_tag == AV_RL32("XVID") || s->codec_tag == AV_RL32("XVIX") ||
 436            s->codec_tag == AV_RL32("RMP4"))
 437             s->xvid_build= -1;
 438 #if 0
 439         if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
 440            && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
 441             s->xvid_build= -1;
 442 #endif
 443     }
 444
 445     if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
 446         if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
 447             s->divx_version= 400; //divx 4
 448     }
 449
 450     if(s->xvid_build && s->divx_version){
 451         s->divx_version=
 452         s->divx_build= 0;
 453     }
 454
 455     if(s->workaround_bugs&FF_BUG_AUTODETECT){
 456         if(s->codec_tag == AV_RL32("XVIX"))
 457             s->workaround_bugs|= FF_BUG_XVID_ILACE;
 458
 459         if(s->codec_tag == AV_RL32("UMP4")){
 460             s->workaround_bugs|= FF_BUG_UMP4;
 461         }
 462
 463         if(s->divx_version>=500 && s->divx_build<1814){
 464             s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
 465         }
 466
 467         if(s->divx_version>502 && s->divx_build<1814){
 468             s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
 469         }
 470
 471         if(s->xvid_build && s->xvid_build<=3)
 472             s->padding_bug_score= 256*256*256*64;
 473
 474         if(s->xvid_build && s->xvid_build<=1)
 475             s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
 476
 477         if(s->xvid_build && s->xvid_build<=12)
 478             s->workaround_bugs|= FF_BUG_EDGE;
 479
 480         if(s->xvid_build && s->xvid_build<=32)
 481             s->workaround_bugs|= FF_BUG_DC_CLIP;
 482
 483 #define SET_QPEL_FUNC(postfix1, postfix2) \
 484     s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
 485     s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
 486     s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
 487
 488         if(s->lavc_build && s->lavc_build<4653)
 489             s->workaround_bugs|= FF_BUG_STD_QPEL;
 490
 491         if(s->lavc_build && s->lavc_build<4655)
 492             s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
 493
 494         if(s->lavc_build && s->lavc_build<4670){
 495             s->workaround_bugs|= FF_BUG_EDGE;
 496         }
 497
 498         if(s->lavc_build && s->lavc_build<=4712)
 499             s->workaround_bugs|= FF_BUG_DC_CLIP;
 500
 501         if(s->divx_version)
 502             s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
 503 //printf("padding_bug_score: %d\n", s->padding_bug_score);
 504         if(s->divx_version==501 && s->divx_build==20020416)
 505             s->padding_bug_score= 256*256*256*64;
 506
 507         if(s->divx_version && s->divx_version<500){
 508             s->workaround_bugs|= FF_BUG_EDGE;
 509         }
 510
 511         if(s->divx_version)
 512             s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
 513 #if 0
 514         if(s->divx_version==500)
 515             s->padding_bug_score= 256*256*256*64;
 516
 517         /* very ugly XVID padding bug detection FIXME/XXX solve this differently
 518          * Let us hope this at least works.
 519          */
 520         if(   s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==0
 521            && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
 522             s->workaround_bugs|= FF_BUG_NO_PADDING;
 523
 524         if(s->lavc_build && s->lavc_build<4609) //FIXME not sure about the version num but a 4609 file seems ok
 525             s->workaround_bugs|= FF_BUG_NO_PADDING;
 526 #endif
 527     }
 528
 529     if(s->workaround_bugs& FF_BUG_STD_QPEL){
 530         SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
 531         SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
 532         SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
 533         SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
 534         SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
 535         SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
 536
 537         SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
 538         SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
 539         SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
 540         SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
 541         SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
 542         SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
 543     }
 544
 545     if(avctx->debug & FF_DEBUG_BUGS)
 546         av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
 547                s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
 548                s->divx_packed ? "p" : "");
 549
 550 #if 0 // dump bits per frame / qp / complexity
 551 {
 552     static FILE *f=NULL;
 553     if(!f) f=fopen("rate_qp_cplx.txt", "w");
 554     fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
 555 }
 556 #endif
 557
 558 #if HAVE_MMX
 559     if(s->codec_id == CODEC_ID_MPEG4 && s->xvid_build && avctx->idct_algo == FF_IDCT_AUTO && (mm_flags & FF_MM_MMX)){
 560         avctx->idct_algo= FF_IDCT_XVIDMMX;
 561         avctx->coded_width= 0; // force reinit
 562 //        dsputil_init(&s->dsp, avctx);
 563         s->picture_number=0;
 564     }
 565 #endif
 566
 567         /* After H263 & mpeg4 header decode we have the height, width,*/
 568         /* and other parameters. So then we could init the picture   */
 569         /* FIXME: By the way H263 decoder is evolving it should have */
 570         /* an H263EncContext                                         */
 571
 572     if (   s->width  != avctx->coded_width
 573         || s->height != avctx->coded_height) {
 574         /* H.263 could change picture size any time */
 575         ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
 576         s->parse_context.buffer=0;
 577         MPV_common_end(s);
 578         s->parse_context= pc;
 579     }
 580     if (!s->context_initialized) {
 581         avcodec_set_dimensions(avctx, s->width, s->height);
 582
 583         goto retry;
 584     }
 585
 586     if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P || s->codec_id == CODEC_ID_H263I))
 587         s->gob_index = ff_h263_get_gob_height(s);
 588
 589     // for hurry_up==5
 590     s->current_picture.pict_type= s->pict_type;
 591     s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
 592
 593     /* skip B-frames if we don't have reference frames */
 594     if(s->last_picture_ptr==NULL && (s->pict_type==FF_B_TYPE || s->dropable)) return get_consumed_bytes(s, buf_size);
 595     /* skip b frames if we are in a hurry */
 596     if(avctx->hurry_up && s->pict_type==FF_B_TYPE) return get_consumed_bytes(s, buf_size);
 597     if(   (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==FF_B_TYPE)
 598        || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=FF_I_TYPE)
 599        ||  avctx->skip_frame >= AVDISCARD_ALL)
 600         return get_consumed_bytes(s, buf_size);
 601     /* skip everything if we are in a hurry>=5 */
 602     if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
 603
 604     if(s->next_p_frame_damaged){
 605         if(s->pict_type==FF_B_TYPE)
 606             return get_consumed_bytes(s, buf_size);
 607         else
 608             s->next_p_frame_damaged=0;
 609     }
 610
 611     if((s->avctx->flags2 & CODEC_FLAG2_FAST) && s->pict_type==FF_B_TYPE){
 612         s->me.qpel_put= s->dsp.put_2tap_qpel_pixels_tab;
 613         s->me.qpel_avg= s->dsp.avg_2tap_qpel_pixels_tab;
 614     }else if((!s->no_rounding) || s->pict_type==FF_B_TYPE){
 615         s->me.qpel_put= s->dsp.put_qpel_pixels_tab;
 616         s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
 617     }else{
 618         s->me.qpel_put= s->dsp.put_no_rnd_qpel_pixels_tab;
 619         s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
 620     }
 621
 622     if(MPV_frame_start(s, avctx) < 0)
 623         return -1;
 624
 625     if (CONFIG_MPEG4_VDPAU_DECODER && (s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)) {
 626         ff_vdpau_mpeg4_decode_picture(s, buf, buf_size);
 627         goto frame_end;
 628     }
 629
 630     if (avctx->hwaccel) {
 631         if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
 632             return -1;
 633     }
 634
 635     ff_er_frame_start(s);
 636
 637     //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
 638     //which is not available before MPV_frame_start()
 639     if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5){
 640         ret = ff_wmv2_decode_secondary_picture_header(s);
 641         if(ret<0) return ret;
 642         if(ret==1) goto intrax8_decoded;
 643     }
 644
 645     /* decode each macroblock */
 646     s->mb_x=0;
 647     s->mb_y=0;
 648
 649     decode_slice(s);
 650     while(s->mb_y<s->mb_height){
 651         if(s->msmpeg4_version){
 652             if(s->slice_height==0 || s->mb_x!=0 || (s->mb_y%s->slice_height)!=0 || get_bits_count(&s->gb) > s->gb.size_in_bits)
 653                 break;
 654         }else{
 655             if(ff_h263_resync(s)<0)
 656                 break;
 657         }
 658
 659         if(s->msmpeg4_version<4 && s->h263_pred)
 660             ff_mpeg4_clean_buffers(s);
 661
 662         decode_slice(s);
 663     }
 664
 665     if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==FF_I_TYPE)
 666         if(!CONFIG_MSMPEG4_DECODER || msmpeg4_decode_ext_header(s, buf_size) < 0){
 667             s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
 668         }
 669
 670     /* divx 5.01+ bistream reorder stuff */
 671     if(s->codec_id==CODEC_ID_MPEG4 && s->bitstream_buffer_size==0 && s->divx_packed){
 672         int current_pos= get_bits_count(&s->gb)>>3;
 673         int startcode_found=0;
 674
 675         if(buf_size - current_pos > 5){
 676             int i;
 677             for(i=current_pos; i<buf_size-3; i++){
 678                 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
 679                     startcode_found=1;
 680                     break;
 681                 }
 682             }
 683         }
 684         if(s->gb.buffer == s->bitstream_buffer && buf_size>20){ //xvid style
 685             startcode_found=1;
 686             current_pos=0;
 687         }
 688
 689         if(startcode_found){
 690             av_fast_malloc(
 691                 &s->bitstream_buffer,
 692                 &s->allocated_bitstream_buffer_size,
 693                 buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
 694             if (!s->bitstream_buffer)
 695                 return AVERROR(ENOMEM);
 696             memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
 697             s->bitstream_buffer_size= buf_size - current_pos;
 698         }
 699     }
 700
 701 intrax8_decoded:
 702     ff_er_frame_end(s);
 703
 704 frame_end:
 705     if (avctx->hwaccel) {
 706         if (avctx->hwaccel->end_frame(avctx) < 0)
 707             return -1;
 708     }
 709
 710     MPV_frame_end(s);
 711
 712 assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);
 713 assert(s->current_picture.pict_type == s->pict_type);
 714     if (s->pict_type == FF_B_TYPE || s->low_delay) {
 715         *pict= *(AVFrame*)s->current_picture_ptr;
 716     } else if (s->last_picture_ptr != NULL) {
 717         *pict= *(AVFrame*)s->last_picture_ptr;
 718     }
 719
 720     if(s->last_picture_ptr || s->low_delay){
 721         *data_size = sizeof(AVFrame);
 722         ff_print_debug_info(s, pict);
 723     }
 724
 725 #ifdef PRINT_FRAME_TIME
 726 av_log(avctx, AV_LOG_DEBUG, "%"PRId64"\n", rdtsc()-time);
 727 #endif
 728
 729     return get_consumed_bytes(s, buf_size);
 730 }
 731
 732 AVCodec mpeg4_decoder = {
 733     "mpeg4",
 734     CODEC_TYPE_VIDEO,
 735     CODEC_ID_MPEG4,
 736     sizeof(MpegEncContext),
 737     ff_h263_decode_init,
 738     NULL,
 739     ff_h263_decode_end,
 740     ff_h263_decode_frame,
 741     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
 742     .flush= ff_mpeg_flush,
 743     .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
 744     .pix_fmts= ff_hwaccel_pixfmt_list_420,
 745 };
 746
 747 AVCodec h263_decoder = {
 748     "h263",
 749     CODEC_TYPE_VIDEO,
 750     CODEC_ID_H263,
 751     sizeof(MpegEncContext),
 752     ff_h263_decode_init,
 753     NULL,
 754     ff_h263_decode_end,
 755     ff_h263_decode_frame,
 756     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
 757     .flush= ff_mpeg_flush,
 758     .long_name= NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
 759     .pix_fmts= ff_hwaccel_pixfmt_list_420,
 760 };
 761
 762 AVCodec msmpeg4v1_decoder = {
 763     "msmpeg4v1",
 764     CODEC_TYPE_VIDEO,
 765     CODEC_ID_MSMPEG4V1,
 766     sizeof(MpegEncContext),
 767     ff_h263_decode_init,
 768     NULL,
 769     ff_h263_decode_end,
 770     ff_h263_decode_frame,
 771     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 772     .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 1"),
 773     .pix_fmts= ff_pixfmt_list_420,
 774 };
 775
 776 AVCodec msmpeg4v2_decoder = {
 777     "msmpeg4v2",
 778     CODEC_TYPE_VIDEO,
 779     CODEC_ID_MSMPEG4V2,
 780     sizeof(MpegEncContext),
 781     ff_h263_decode_init,
 782     NULL,
 783     ff_h263_decode_end,
 784     ff_h263_decode_frame,
 785     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 786     .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 2"),
 787     .pix_fmts= ff_pixfmt_list_420,
 788 };
 789
 790 AVCodec msmpeg4v3_decoder = {
 791     "msmpeg4",
 792     CODEC_TYPE_VIDEO,
 793     CODEC_ID_MSMPEG4V3,
 794     sizeof(MpegEncContext),
 795     ff_h263_decode_init,
 796     NULL,
 797     ff_h263_decode_end,
 798     ff_h263_decode_frame,
 799     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 800     .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 3"),
 801     .pix_fmts= ff_pixfmt_list_420,
 802 };
 803
 804 AVCodec wmv1_decoder = {
 805     "wmv1",
 806     CODEC_TYPE_VIDEO,
 807     CODEC_ID_WMV1,
 808     sizeof(MpegEncContext),
 809     ff_h263_decode_init,
 810     NULL,
 811     ff_h263_decode_end,
 812     ff_h263_decode_frame,
 813     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 814     .long_name= NULL_IF_CONFIG_SMALL("Windows Media Video 7"),
 815     .pix_fmts= ff_pixfmt_list_420,
 816 };
 817
 818 AVCodec h263i_decoder = {
 819     "h263i",
 820     CODEC_TYPE_VIDEO,
 821     CODEC_ID_H263I,
 822     sizeof(MpegEncContext),
 823     ff_h263_decode_init,
 824     NULL,
 825     ff_h263_decode_end,
 826     ff_h263_decode_frame,
 827     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 828     .long_name = NULL_IF_CONFIG_SMALL("Intel H.263"),
 829     .pix_fmts= ff_pixfmt_list_420,
 830 };
 831
 832 AVCodec flv_decoder = {
 833     "flv",
 834     CODEC_TYPE_VIDEO,
 835     CODEC_ID_FLV1,
 836     sizeof(MpegEncContext),
 837     ff_h263_decode_init,
 838     NULL,
 839     ff_h263_decode_end,
 840     ff_h263_decode_frame,
 841     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
 842     .long_name= NULL_IF_CONFIG_SMALL("Flash Video (FLV) / Sorenson Spark / Sorenson H.263"),
 843     .pix_fmts= ff_pixfmt_list_420,
 844 };
 845
 846 #if CONFIG_MPEG4_VDPAU_DECODER
 847 AVCodec mpeg4_vdpau_decoder = {
 848     "mpeg4_vdpau",
 849     CODEC_TYPE_VIDEO,
 850     CODEC_ID_MPEG4,
 851     sizeof(MpegEncContext),
 852     ff_h263_decode_init,
 853     NULL,
 854     ff_h263_decode_end,
 855     ff_h263_decode_frame,
 856     CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_HWACCEL_VDPAU,
 857     .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2 (VDPAU)"),
 858     .pix_fmts= (const enum PixelFormat[]){PIX_FMT_VDPAU_MPEG4, PIX_FMT_NONE},
 859 };
 860 #endif