LCOV - code coverage report
Current view: top level - libavformat - h263dec.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 38 39 97.4 %
Date: 2017-12-15 18:13:28 Functions: 1 1 100.0 %

          Line data    Source code
       1             : /*
       2             :  * RAW H.263 video demuxer
       3             :  * Copyright (c) 2009 Michael Niedermayer <michaelni@gmx.at>
       4             :  *
       5             :  * This file is part of FFmpeg.
       6             :  *
       7             :  * FFmpeg is free software; you can redistribute it and/or
       8             :  * modify it under the terms of the GNU Lesser General Public
       9             :  * License as published by the Free Software Foundation; either
      10             :  * version 2.1 of the License, or (at your option) any later version.
      11             :  *
      12             :  * FFmpeg is distributed in the hope that it will be useful,
      13             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      14             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      15             :  * Lesser General Public License for more details.
      16             :  *
      17             :  * You should have received a copy of the GNU Lesser General Public
      18             :  * License along with FFmpeg; if not, write to the Free Software
      19             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      20             :  */
      21             : 
      22             : #include "avformat.h"
      23             : #include "rawdec.h"
      24             : 
      25        6130 : static int h263_probe(AVProbeData *p)
      26             : {
      27        6130 :     uint64_t code= -1;
      28             :     int i;
      29        6130 :     int valid_psc=0;
      30        6130 :     int invalid_psc=0;
      31        6130 :     int res_change=0;
      32        6130 :     int src_fmt, last_src_fmt=-1;
      33        6130 :     int last_gn=0;
      34        6130 :     int tr, last_tr = -1;
      35             : 
      36   128280795 :     for(i=0; i<p->buf_size; i++){
      37   128274665 :         code = (code<<8) + p->buf[i];
      38   128274665 :         if ((code & 0xfffffc000000) == 0x80000000) {
      39        9330 :             tr = (code >> 18) & 0xFF;
      40        9330 :             src_fmt= (code>>10)&7;
      41        9330 :             if(   src_fmt != last_src_fmt
      42        4438 :                && last_src_fmt>0 && last_src_fmt<6
      43        1689 :                && src_fmt<6)
      44        1061 :                 res_change++;
      45             : 
      46        9330 :             if (tr == last_tr) {
      47        3229 :                 invalid_psc++;
      48        3229 :                 continue;
      49             :             }
      50             : 
      51        6101 :             if (src_fmt != 7 && !(code&(1<<9)) && (code&(1<<5))) {
      52         423 :                 invalid_psc++;
      53         423 :                 continue;
      54             :             }
      55             : 
      56        5678 :             if((code&0x30000)==0x20000 && src_fmt){
      57         310 :                 valid_psc++;
      58         310 :                 last_gn=0;
      59             :             }else
      60        5368 :                 invalid_psc++;
      61        5678 :             last_src_fmt= src_fmt;
      62        5678 :             last_tr = tr;
      63   128265335 :         } else if((code & 0xffff80000000) == 0x80000000) {
      64      556898 :             int gn= (code>>(31-5)) & 0x1F;
      65      556898 :             if(gn<last_gn){
      66      125242 :                 invalid_psc++;
      67             :             }else
      68      431656 :                 last_gn= gn;
      69             :         }
      70             :     }
      71        6130 :     if(valid_psc > 2*invalid_psc + 2*res_change + 3){
      72           0 :         return AVPROBE_SCORE_EXTENSION;
      73        6130 :     }else if(valid_psc > 2*invalid_psc)
      74         166 :         return AVPROBE_SCORE_EXTENSION / 2;
      75        5964 :     return 0;
      76             : }
      77             : 
      78             : FF_DEF_RAWVIDEO_DEMUXER(h263, "raw H.263", h263_probe, NULL, AV_CODEC_ID_H263)

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