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libavcodec/h263dec.c

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00001 /*
00002  * H.263 decoder
00003  * Copyright (c) 2001 Fabrice Bellard
00004  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
00005  *
00006  * This file is part of FFmpeg.
00007  *
00008  * FFmpeg is free software; you can redistribute it and/or
00009  * modify it under the terms of the GNU Lesser General Public
00010  * License as published by the Free Software Foundation; either
00011  * version 2.1 of the License, or (at your option) any later version.
00012  *
00013  * FFmpeg is distributed in the hope that it will be useful,
00014  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00015  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00016  * Lesser General Public License for more details.
00017  *
00018  * You should have received a copy of the GNU Lesser General Public
00019  * License along with FFmpeg; if not, write to the Free Software
00020  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00021  */
00022 
00028 #include "internal.h"
00029 #include "avcodec.h"
00030 #include "dsputil.h"
00031 #include "mpegvideo.h"
00032 #include "h263_parser.h"
00033 #include "mpeg4video_parser.h"
00034 #include "msmpeg4.h"
00035 
00036 //#define DEBUG
00037 //#define PRINT_FRAME_TIME
00038 
00039 av_cold int ff_h263_decode_init(AVCodecContext *avctx)
00040 {
00041     MpegEncContext *s = avctx->priv_data;
00042 
00043     s->avctx = avctx;
00044     s->out_format = FMT_H263;
00045 
00046     s->width  = avctx->coded_width;
00047     s->height = avctx->coded_height;
00048     s->workaround_bugs= avctx->workaround_bugs;
00049 
00050     // set defaults
00051     MPV_decode_defaults(s);
00052     s->quant_precision=5;
00053     s->decode_mb= ff_h263_decode_mb;
00054     s->low_delay= 1;
00055     avctx->pix_fmt= avctx->get_format(avctx, avctx->codec->pix_fmts);
00056     s->unrestricted_mv= 1;
00057 
00058     /* select sub codec */
00059     switch(avctx->codec->id) {
00060     case CODEC_ID_H263:
00061         s->unrestricted_mv= 0;
00062         break;
00063     case CODEC_ID_MPEG4:
00064         s->decode_mb= ff_mpeg4_decode_mb;
00065         s->time_increment_bits = 4; /* default value for broken headers */
00066         s->h263_pred = 1;
00067         s->low_delay = 0; //default, might be overriden in the vol header during header parsing
00068         break;
00069     case CODEC_ID_MSMPEG4V1:
00070         s->h263_msmpeg4 = 1;
00071         s->h263_pred = 1;
00072         s->msmpeg4_version=1;
00073         break;
00074     case CODEC_ID_MSMPEG4V2:
00075         s->h263_msmpeg4 = 1;
00076         s->h263_pred = 1;
00077         s->msmpeg4_version=2;
00078         break;
00079     case CODEC_ID_MSMPEG4V3:
00080         s->h263_msmpeg4 = 1;
00081         s->h263_pred = 1;
00082         s->msmpeg4_version=3;
00083         break;
00084     case CODEC_ID_WMV1:
00085         s->h263_msmpeg4 = 1;
00086         s->h263_pred = 1;
00087         s->msmpeg4_version=4;
00088         break;
00089     case CODEC_ID_WMV2:
00090         s->h263_msmpeg4 = 1;
00091         s->h263_pred = 1;
00092         s->msmpeg4_version=5;
00093         break;
00094     case CODEC_ID_VC1:
00095     case CODEC_ID_WMV3:
00096         s->h263_msmpeg4 = 1;
00097         s->h263_pred = 1;
00098         s->msmpeg4_version=6;
00099         break;
00100     case CODEC_ID_H263I:
00101         break;
00102     case CODEC_ID_FLV1:
00103         s->h263_flv = 1;
00104         break;
00105     default:
00106         return -1;
00107     }
00108     s->codec_id= avctx->codec->id;
00109     avctx->hwaccel= ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
00110 
00111     /* for h263, we allocate the images after having read the header */
00112     if (avctx->codec->id != CODEC_ID_H263 && avctx->codec->id != CODEC_ID_MPEG4)
00113         if (MPV_common_init(s) < 0)
00114             return -1;
00115 
00116     if (CONFIG_MSMPEG4_DECODER && s->h263_msmpeg4)
00117         ff_msmpeg4_decode_init(s);
00118     else
00119         h263_decode_init_vlc(s);
00120 
00121     return 0;
00122 }
00123 
00124 av_cold int ff_h263_decode_end(AVCodecContext *avctx)
00125 {
00126     MpegEncContext *s = avctx->priv_data;
00127 
00128     MPV_common_end(s);
00129     return 0;
00130 }
00131 
00135 static int get_consumed_bytes(MpegEncContext *s, int buf_size){
00136     int pos= (get_bits_count(&s->gb)+7)>>3;
00137 
00138     if(s->divx_packed || s->avctx->hwaccel){
00139         //we would have to scan through the whole buf to handle the weird reordering ...
00140         return buf_size;
00141     }else if(s->flags&CODEC_FLAG_TRUNCATED){
00142         pos -= s->parse_context.last_index;
00143         if(pos<0) pos=0; // padding is not really read so this might be -1
00144         return pos;
00145     }else{
00146         if(pos==0) pos=1; //avoid infinite loops (i doubt that is needed but ...)
00147         if(pos+10>buf_size) pos=buf_size; // oops ;)
00148 
00149         return pos;
00150     }
00151 }
00152 
00153 static int decode_slice(MpegEncContext *s){
00154     const int part_mask= s->partitioned_frame ? (AC_END|AC_ERROR) : 0x7F;
00155     const int mb_size= 16>>s->avctx->lowres;
00156     s->last_resync_gb= s->gb;
00157     s->first_slice_line= 1;
00158 
00159     s->resync_mb_x= s->mb_x;
00160     s->resync_mb_y= s->mb_y;
00161 
00162     ff_set_qscale(s, s->qscale);
00163 
00164     if (s->avctx->hwaccel) {
00165         const uint8_t *start= s->gb.buffer + get_bits_count(&s->gb)/8;
00166         const uint8_t *end  = ff_h263_find_resync_marker(start + 1, s->gb.buffer_end);
00167         skip_bits_long(&s->gb, 8*(end - start));
00168         return s->avctx->hwaccel->decode_slice(s->avctx, start, end - start);
00169     }
00170 
00171     if(s->partitioned_frame){
00172         const int qscale= s->qscale;
00173 
00174         if(s->codec_id==CODEC_ID_MPEG4){
00175             if(ff_mpeg4_decode_partitions(s) < 0)
00176                 return -1;
00177         }
00178 
00179         /* restore variables which were modified */
00180         s->first_slice_line=1;
00181         s->mb_x= s->resync_mb_x;
00182         s->mb_y= s->resync_mb_y;
00183         ff_set_qscale(s, qscale);
00184     }
00185 
00186     for(; s->mb_y < s->mb_height; s->mb_y++) {
00187         /* per-row end of slice checks */
00188         if(s->msmpeg4_version){
00189             if(s->resync_mb_y + s->slice_height == s->mb_y){
00190                 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);
00191 
00192                 return 0;
00193             }
00194         }
00195 
00196         if(s->msmpeg4_version==1){
00197             s->last_dc[0]=
00198             s->last_dc[1]=
00199             s->last_dc[2]= 128;
00200         }
00201 
00202         ff_init_block_index(s);
00203         for(; s->mb_x < s->mb_width; s->mb_x++) {
00204             int ret;
00205 
00206             ff_update_block_index(s);
00207 
00208             if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
00209                 s->first_slice_line=0;
00210             }
00211 
00212             /* DCT & quantize */
00213 
00214             s->mv_dir = MV_DIR_FORWARD;
00215             s->mv_type = MV_TYPE_16X16;
00216 //            s->mb_skipped = 0;
00217 //printf("%d %d %06X\n", ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
00218             ret= s->decode_mb(s, s->block);
00219 
00220             if (s->pict_type!=FF_B_TYPE)
00221                 ff_h263_update_motion_val(s);
00222 
00223             if(ret<0){
00224                 const int xy= s->mb_x + s->mb_y*s->mb_stride;
00225                 if(ret==SLICE_END){
00226                     MPV_decode_mb(s, s->block);
00227                     if(s->loop_filter)
00228                         ff_h263_loop_filter(s);
00229 
00230 //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));
00231                     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);
00232 
00233                     s->padding_bug_score--;
00234 
00235                     if(++s->mb_x >= s->mb_width){
00236                         s->mb_x=0;
00237                         ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
00238                         s->mb_y++;
00239                     }
00240                     return 0;
00241                 }else if(ret==SLICE_NOEND){
00242                     av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy);
00243                     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);
00244                     return -1;
00245                 }
00246                 av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
00247                 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);
00248 
00249                 return -1;
00250             }
00251 
00252             MPV_decode_mb(s, s->block);
00253             if(s->loop_filter)
00254                 ff_h263_loop_filter(s);
00255         }
00256 
00257         ff_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
00258 
00259         s->mb_x= 0;
00260     }
00261 
00262     assert(s->mb_x==0 && s->mb_y==s->mb_height);
00263 
00264     /* try to detect the padding bug */
00265     if(      s->codec_id==CODEC_ID_MPEG4
00266        &&   (s->workaround_bugs&FF_BUG_AUTODETECT)
00267        &&    s->gb.size_in_bits - get_bits_count(&s->gb) >=0
00268        &&    s->gb.size_in_bits - get_bits_count(&s->gb) < 48
00269 //       &&   !s->resync_marker
00270        &&   !s->data_partitioning){
00271 
00272         const int bits_count= get_bits_count(&s->gb);
00273         const int bits_left = s->gb.size_in_bits - bits_count;
00274 
00275         if(bits_left==0){
00276             s->padding_bug_score+=16;
00277         } else if(bits_left != 1){
00278             int v= show_bits(&s->gb, 8);
00279             v|= 0x7F >> (7-(bits_count&7));
00280 
00281             if(v==0x7F && bits_left<=8)
00282                 s->padding_bug_score--;
00283             else if(v==0x7F && ((get_bits_count(&s->gb)+8)&8) && bits_left<=16)
00284                 s->padding_bug_score+= 4;
00285             else
00286                 s->padding_bug_score++;
00287         }
00288     }
00289 
00290     if(s->workaround_bugs&FF_BUG_AUTODETECT){
00291         if(s->padding_bug_score > -2 && !s->data_partitioning /*&& (s->divx_version || !s->resync_marker)*/)
00292             s->workaround_bugs |=  FF_BUG_NO_PADDING;
00293         else
00294             s->workaround_bugs &= ~FF_BUG_NO_PADDING;
00295     }
00296 
00297     // handle formats which don't have unique end markers
00298     if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
00299         int left= s->gb.size_in_bits - get_bits_count(&s->gb);
00300         int max_extra=7;
00301 
00302         /* no markers in M$ crap */
00303         if(s->msmpeg4_version && s->pict_type==FF_I_TYPE)
00304             max_extra+= 17;
00305 
00306         /* buggy padding but the frame should still end approximately at the bitstream end */
00307         if((s->workaround_bugs&FF_BUG_NO_PADDING) && s->error_recognition>=3)
00308             max_extra+= 48;
00309         else if((s->workaround_bugs&FF_BUG_NO_PADDING))
00310             max_extra+= 256*256*256*64;
00311 
00312         if(left>max_extra){
00313             av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
00314         }
00315         else if(left<0){
00316             av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
00317         }else
00318             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);
00319 
00320         return 0;
00321     }
00322 
00323     av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
00324             s->gb.size_in_bits - get_bits_count(&s->gb),
00325             show_bits(&s->gb, 24), s->padding_bug_score);
00326 
00327     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);
00328 
00329     return -1;
00330 }
00331 
00332 int ff_h263_decode_frame(AVCodecContext *avctx,
00333                              void *data, int *data_size,
00334                              const uint8_t *buf, int buf_size)
00335 {
00336     MpegEncContext *s = avctx->priv_data;
00337     int ret;
00338     AVFrame *pict = data;
00339 
00340 #ifdef PRINT_FRAME_TIME
00341 uint64_t time= rdtsc();
00342 #endif
00343 #ifdef DEBUG
00344     av_log(avctx, AV_LOG_DEBUG, "*****frame %d size=%d\n", avctx->frame_number, buf_size);
00345     if(buf_size>0)
00346         av_log(avctx, AV_LOG_DEBUG, "bytes=%x %x %x %x\n", buf[0], buf[1], buf[2], buf[3]);
00347 #endif
00348     s->flags= avctx->flags;
00349     s->flags2= avctx->flags2;
00350 
00351     /* no supplementary picture */
00352     if (buf_size == 0) {
00353         /* special case for last picture */
00354         if (s->low_delay==0 && s->next_picture_ptr) {
00355             *pict= *(AVFrame*)s->next_picture_ptr;
00356             s->next_picture_ptr= NULL;
00357 
00358             *data_size = sizeof(AVFrame);
00359         }
00360 
00361         return 0;
00362     }
00363 
00364     if(s->flags&CODEC_FLAG_TRUNCATED){
00365         int next;
00366 
00367         if(CONFIG_MPEG4_DECODER && s->codec_id==CODEC_ID_MPEG4){
00368             next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
00369         }else if(CONFIG_H263_DECODER && s->codec_id==CODEC_ID_H263){
00370             next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
00371         }else{
00372             av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n");
00373             return -1;
00374         }
00375 
00376         if( ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
00377             return buf_size;
00378     }
00379 
00380 
00381 retry:
00382 
00383     if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
00384         init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
00385     }else
00386         init_get_bits(&s->gb, buf, buf_size*8);
00387     s->bitstream_buffer_size=0;
00388 
00389     if (!s->context_initialized) {
00390         if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
00391             return -1;
00392     }
00393 
00394     /* We need to set current_picture_ptr before reading the header,
00395      * otherwise we cannot store anyting in there */
00396     if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){
00397         int i= ff_find_unused_picture(s, 0);
00398         s->current_picture_ptr= &s->picture[i];
00399     }
00400 
00401     /* let's go :-) */
00402     if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5) {
00403         ret= ff_wmv2_decode_picture_header(s);
00404     } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
00405         ret = msmpeg4_decode_picture_header(s);
00406     } else if (s->h263_pred) {
00407         if(s->avctx->extradata_size && s->picture_number==0){
00408             GetBitContext gb;
00409 
00410             init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
00411             ret = ff_mpeg4_decode_picture_header(s, &gb);
00412         }
00413         ret = ff_mpeg4_decode_picture_header(s, &s->gb);
00414     } else if (s->codec_id == CODEC_ID_H263I) {
00415         ret = intel_h263_decode_picture_header(s);
00416     } else if (s->h263_flv) {
00417         ret = flv_h263_decode_picture_header(s);
00418     } else {
00419         ret = h263_decode_picture_header(s);
00420     }
00421 
00422     if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size);
00423 
00424     /* skip if the header was thrashed */
00425     if (ret < 0){
00426         av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
00427         return -1;
00428     }
00429 
00430     avctx->has_b_frames= !s->low_delay;
00431 
00432     if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
00433         if(s->stream_codec_tag == AV_RL32("XVID") ||
00434            s->codec_tag == AV_RL32("XVID") || s->codec_tag == AV_RL32("XVIX") ||
00435            s->codec_tag == AV_RL32("RMP4"))
00436             s->xvid_build= -1;
00437 #if 0
00438         if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
00439            && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
00440             s->xvid_build= -1;
00441 #endif
00442     }
00443 
00444     if(s->xvid_build==0 && s->divx_version==0 && s->lavc_build==0){
00445         if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
00446             s->divx_version= 400; //divx 4
00447     }
00448 
00449     if(s->xvid_build && s->divx_version){
00450         s->divx_version=
00451         s->divx_build= 0;
00452     }
00453 
00454     if(s->workaround_bugs&FF_BUG_AUTODETECT){
00455         if(s->codec_tag == AV_RL32("XVIX"))
00456             s->workaround_bugs|= FF_BUG_XVID_ILACE;
00457 
00458         if(s->codec_tag == AV_RL32("UMP4")){
00459             s->workaround_bugs|= FF_BUG_UMP4;
00460         }
00461 
00462         if(s->divx_version>=500 && s->divx_build<1814){
00463             s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
00464         }
00465 
00466         if(s->divx_version>502 && s->divx_build<1814){
00467             s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
00468         }
00469 
00470         if(s->xvid_build && s->xvid_build<=3)
00471             s->padding_bug_score= 256*256*256*64;
00472 
00473         if(s->xvid_build && s->xvid_build<=1)
00474             s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
00475 
00476         if(s->xvid_build && s->xvid_build<=12)
00477             s->workaround_bugs|= FF_BUG_EDGE;
00478 
00479         if(s->xvid_build && s->xvid_build<=32)
00480             s->workaround_bugs|= FF_BUG_DC_CLIP;
00481 
00482 #define SET_QPEL_FUNC(postfix1, postfix2) \
00483     s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
00484     s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
00485     s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
00486 
00487         if(s->lavc_build && s->lavc_build<4653)
00488             s->workaround_bugs|= FF_BUG_STD_QPEL;
00489 
00490         if(s->lavc_build && s->lavc_build<4655)
00491             s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
00492 
00493         if(s->lavc_build && s->lavc_build<4670){
00494             s->workaround_bugs|= FF_BUG_EDGE;
00495         }
00496 
00497         if(s->lavc_build && s->lavc_build<=4712)
00498             s->workaround_bugs|= FF_BUG_DC_CLIP;
00499 
00500         if(s->divx_version)
00501             s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
00502 //printf("padding_bug_score: %d\n", s->padding_bug_score);
00503         if(s->divx_version==501 && s->divx_build==20020416)
00504             s->padding_bug_score= 256*256*256*64;
00505 
00506         if(s->divx_version && s->divx_version<500){
00507             s->workaround_bugs|= FF_BUG_EDGE;
00508         }
00509 
00510         if(s->divx_version)
00511             s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
00512 #if 0
00513         if(s->divx_version==500)
00514             s->padding_bug_score= 256*256*256*64;
00515 
00516         /* very ugly XVID padding bug detection FIXME/XXX solve this differently
00517          * Let us hope this at least works.
00518          */
00519         if(   s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==0
00520            && s->codec_id==CODEC_ID_MPEG4 && s->vo_type==0)
00521             s->workaround_bugs|= FF_BUG_NO_PADDING;
00522 
00523         if(s->lavc_build && s->lavc_build<4609) //FIXME not sure about the version num but a 4609 file seems ok
00524             s->workaround_bugs|= FF_BUG_NO_PADDING;
00525 #endif
00526     }
00527 
00528     if(s->workaround_bugs& FF_BUG_STD_QPEL){
00529         SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
00530         SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
00531         SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
00532         SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
00533         SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
00534         SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
00535 
00536         SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
00537         SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
00538         SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
00539         SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
00540         SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
00541         SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
00542     }
00543 
00544     if(avctx->debug & FF_DEBUG_BUGS)
00545         av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
00546                s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
00547                s->divx_packed ? "p" : "");
00548 
00549 #if 0 // dump bits per frame / qp / complexity
00550 {
00551     static FILE *f=NULL;
00552     if(!f) f=fopen("rate_qp_cplx.txt", "w");
00553     fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale);
00554 }
00555 #endif
00556 
00557 #if HAVE_MMX
00558     if(s->codec_id == CODEC_ID_MPEG4 && s->xvid_build && avctx->idct_algo == FF_IDCT_AUTO && (mm_flags & FF_MM_MMX)){
00559         avctx->idct_algo= FF_IDCT_XVIDMMX;
00560         avctx->coded_width= 0; // force reinit
00561 //        dsputil_init(&s->dsp, avctx);
00562         s->picture_number=0;
00563     }
00564 #endif
00565 
00566         /* After H263 & mpeg4 header decode we have the height, width,*/
00567         /* and other parameters. So then we could init the picture   */
00568         /* FIXME: By the way H263 decoder is evolving it should have */
00569         /* an H263EncContext                                         */
00570 
00571     if (   s->width  != avctx->coded_width
00572         || s->height != avctx->coded_height) {
00573         /* H.263 could change picture size any time */
00574         ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
00575         s->parse_context.buffer=0;
00576         MPV_common_end(s);
00577         s->parse_context= pc;
00578     }
00579     if (!s->context_initialized) {
00580         avcodec_set_dimensions(avctx, s->width, s->height);
00581 
00582         goto retry;
00583     }
00584 
00585     if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P || s->codec_id == CODEC_ID_H263I))
00586         s->gob_index = ff_h263_get_gob_height(s);
00587 
00588     // for hurry_up==5
00589     s->current_picture.pict_type= s->pict_type;
00590     s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
00591 
00592     /* skip B-frames if we don't have reference frames */
00593     if(s->last_picture_ptr==NULL && (s->pict_type==FF_B_TYPE || s->dropable)) return get_consumed_bytes(s, buf_size);
00594     /* skip b frames if we are in a hurry */
00595     if(avctx->hurry_up && s->pict_type==FF_B_TYPE) return get_consumed_bytes(s, buf_size);
00596     if(   (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==FF_B_TYPE)
00597        || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=FF_I_TYPE)
00598        ||  avctx->skip_frame >= AVDISCARD_ALL)
00599         return get_consumed_bytes(s, buf_size);
00600     /* skip everything if we are in a hurry>=5 */
00601     if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
00602 
00603     if(s->next_p_frame_damaged){
00604         if(s->pict_type==FF_B_TYPE)
00605             return get_consumed_bytes(s, buf_size);
00606         else
00607             s->next_p_frame_damaged=0;
00608     }
00609 
00610     if((s->avctx->flags2 & CODEC_FLAG2_FAST) && s->pict_type==FF_B_TYPE){
00611         s->me.qpel_put= s->dsp.put_2tap_qpel_pixels_tab;
00612         s->me.qpel_avg= s->dsp.avg_2tap_qpel_pixels_tab;
00613     }else if((!s->no_rounding) || s->pict_type==FF_B_TYPE){
00614         s->me.qpel_put= s->dsp.put_qpel_pixels_tab;
00615         s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
00616     }else{
00617         s->me.qpel_put= s->dsp.put_no_rnd_qpel_pixels_tab;
00618         s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
00619     }
00620 
00621     if(MPV_frame_start(s, avctx) < 0)
00622         return -1;
00623 
00624     if (avctx->hwaccel) {
00625         if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
00626             return -1;
00627     }
00628 
00629 #ifdef DEBUG
00630     av_log(avctx, AV_LOG_DEBUG, "qscale=%d\n", s->qscale);
00631 #endif
00632 
00633     ff_er_frame_start(s);
00634 
00635     //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
00636     //which is not available before MPV_frame_start()
00637     if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5){
00638         ret = ff_wmv2_decode_secondary_picture_header(s);
00639         if(ret<0) return ret;
00640         if(ret==1) goto intrax8_decoded;
00641     }
00642 
00643     /* decode each macroblock */
00644     s->mb_x=0;
00645     s->mb_y=0;
00646 
00647     decode_slice(s);
00648     while(s->mb_y<s->mb_height){
00649         if(s->msmpeg4_version){
00650             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)
00651                 break;
00652         }else{
00653             if(ff_h263_resync(s)<0)
00654                 break;
00655         }
00656 
00657         if(s->msmpeg4_version<4 && s->h263_pred)
00658             ff_mpeg4_clean_buffers(s);
00659 
00660         decode_slice(s);
00661     }
00662 
00663     if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==FF_I_TYPE)
00664         if(!CONFIG_MSMPEG4_DECODER || msmpeg4_decode_ext_header(s, buf_size) < 0){
00665             s->error_status_table[s->mb_num-1]= AC_ERROR|DC_ERROR|MV_ERROR;
00666         }
00667 
00668     /* divx 5.01+ bistream reorder stuff */
00669     if(s->codec_id==CODEC_ID_MPEG4 && s->bitstream_buffer_size==0 && s->divx_packed){
00670         int current_pos= get_bits_count(&s->gb)>>3;
00671         int startcode_found=0;
00672 
00673         if(buf_size - current_pos > 5){
00674             int i;
00675             for(i=current_pos; i<buf_size-3; i++){
00676                 if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
00677                     startcode_found=1;
00678                     break;
00679                 }
00680             }
00681         }
00682         if(s->gb.buffer == s->bitstream_buffer && buf_size>20){ //xvid style
00683             startcode_found=1;
00684             current_pos=0;
00685         }
00686 
00687         if(startcode_found){
00688             s->bitstream_buffer= av_fast_realloc(
00689                 s->bitstream_buffer,
00690                 &s->allocated_bitstream_buffer_size,
00691                 buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
00692             memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
00693             s->bitstream_buffer_size= buf_size - current_pos;
00694         }
00695     }
00696 
00697 intrax8_decoded:
00698     ff_er_frame_end(s);
00699 
00700     if (avctx->hwaccel) {
00701         if (avctx->hwaccel->end_frame(avctx) < 0)
00702             return -1;
00703     }
00704 
00705     MPV_frame_end(s);
00706 
00707 assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);
00708 assert(s->current_picture.pict_type == s->pict_type);
00709     if (s->pict_type == FF_B_TYPE || s->low_delay) {
00710         *pict= *(AVFrame*)s->current_picture_ptr;
00711     } else if (s->last_picture_ptr != NULL) {
00712         *pict= *(AVFrame*)s->last_picture_ptr;
00713     }
00714 
00715     if(s->last_picture_ptr || s->low_delay){
00716         *data_size = sizeof(AVFrame);
00717         ff_print_debug_info(s, pict);
00718     }
00719 
00720     /* Return the Picture timestamp as the frame number */
00721     /* we subtract 1 because it is added on utils.c     */
00722     avctx->frame_number = s->picture_number - 1;
00723 
00724 #ifdef PRINT_FRAME_TIME
00725 av_log(avctx, AV_LOG_DEBUG, "%"PRId64"\n", rdtsc()-time);
00726 #endif
00727 
00728     return get_consumed_bytes(s, buf_size);
00729 }
00730 
00731 AVCodec mpeg4_decoder = {
00732     "mpeg4",
00733     CODEC_TYPE_VIDEO,
00734     CODEC_ID_MPEG4,
00735     sizeof(MpegEncContext),
00736     ff_h263_decode_init,
00737     NULL,
00738     ff_h263_decode_end,
00739     ff_h263_decode_frame,
00740     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
00741     .flush= ff_mpeg_flush,
00742     .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
00743     .pix_fmts= ff_hwaccel_pixfmt_list_420,
00744 };
00745 
00746 AVCodec h263_decoder = {
00747     "h263",
00748     CODEC_TYPE_VIDEO,
00749     CODEC_ID_H263,
00750     sizeof(MpegEncContext),
00751     ff_h263_decode_init,
00752     NULL,
00753     ff_h263_decode_end,
00754     ff_h263_decode_frame,
00755     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
00756     .flush= ff_mpeg_flush,
00757     .long_name= NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
00758     .pix_fmts= ff_hwaccel_pixfmt_list_420,
00759 };
00760 
00761 AVCodec msmpeg4v1_decoder = {
00762     "msmpeg4v1",
00763     CODEC_TYPE_VIDEO,
00764     CODEC_ID_MSMPEG4V1,
00765     sizeof(MpegEncContext),
00766     ff_h263_decode_init,
00767     NULL,
00768     ff_h263_decode_end,
00769     ff_h263_decode_frame,
00770     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
00771     .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 1"),
00772     .pix_fmts= ff_pixfmt_list_420,
00773 };
00774 
00775 AVCodec msmpeg4v2_decoder = {
00776     "msmpeg4v2",
00777     CODEC_TYPE_VIDEO,
00778     CODEC_ID_MSMPEG4V2,
00779     sizeof(MpegEncContext),
00780     ff_h263_decode_init,
00781     NULL,
00782     ff_h263_decode_end,
00783     ff_h263_decode_frame,
00784     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
00785     .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 2"),
00786     .pix_fmts= ff_pixfmt_list_420,
00787 };
00788 
00789 AVCodec msmpeg4v3_decoder = {
00790     "msmpeg4",
00791     CODEC_TYPE_VIDEO,
00792     CODEC_ID_MSMPEG4V3,
00793     sizeof(MpegEncContext),
00794     ff_h263_decode_init,
00795     NULL,
00796     ff_h263_decode_end,
00797     ff_h263_decode_frame,
00798     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
00799     .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 3"),
00800     .pix_fmts= ff_pixfmt_list_420,
00801 };
00802 
00803 AVCodec wmv1_decoder = {
00804     "wmv1",
00805     CODEC_TYPE_VIDEO,
00806     CODEC_ID_WMV1,
00807     sizeof(MpegEncContext),
00808     ff_h263_decode_init,
00809     NULL,
00810     ff_h263_decode_end,
00811     ff_h263_decode_frame,
00812     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
00813     .long_name= NULL_IF_CONFIG_SMALL("Windows Media Video 7"),
00814     .pix_fmts= ff_pixfmt_list_420,
00815 };
00816 
00817 AVCodec h263i_decoder = {
00818     "h263i",
00819     CODEC_TYPE_VIDEO,
00820     CODEC_ID_H263I,
00821     sizeof(MpegEncContext),
00822     ff_h263_decode_init,
00823     NULL,
00824     ff_h263_decode_end,
00825     ff_h263_decode_frame,
00826     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
00827     .long_name = NULL_IF_CONFIG_SMALL("Intel H.263"),
00828     .pix_fmts= ff_pixfmt_list_420,
00829 };
00830 
00831 AVCodec flv_decoder = {
00832     "flv",
00833     CODEC_TYPE_VIDEO,
00834     CODEC_ID_FLV1,
00835     sizeof(MpegEncContext),
00836     ff_h263_decode_init,
00837     NULL,
00838     ff_h263_decode_end,
00839     ff_h263_decode_frame,
00840     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
00841     .long_name= NULL_IF_CONFIG_SMALL("Flash Video (FLV)"),
00842     .pix_fmts= ff_pixfmt_list_420,
00843 };

Generated on Sat Feb 16 2013 09:23:12 for ffmpeg by  doxygen 1.7.1