LCOV - code coverage report
Current view: top level - libavformat - h261dec.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 21 23 91.3 %
Date: 2017-12-14 08:27:08 Functions: 1 1 100.0 %

          Line data    Source code
       1             : /*
       2             :  * RAW H.261 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 "libavcodec/get_bits.h"
      23             : #include "avformat.h"
      24             : #include "rawdec.h"
      25             : 
      26        6130 : static int h261_probe(AVProbeData *p)
      27             : {
      28             :     int i;
      29        6130 :     int valid_psc=0;
      30        6130 :     int invalid_psc=0;
      31        6130 :     int next_gn=0;
      32        6130 :     int src_fmt=0;
      33             : 
      34   128280795 :     for(i=0; i<p->buf_size; i++){
      35   128274665 :         if ((AV_RB16(&p->buf[i]) - 1) < 0xFFU) {
      36     3589704 :             int shift = av_log2_16bit(p->buf[i+1]);
      37     3589704 :             uint32_t code = AV_RB64(&p->buf[FFMAX(i-1, 0)]) >> (24+shift);
      38     3589704 :             if ((code & 0xffff0000) == 0x10000) {
      39     1390489 :                 int gn= (code>>12)&0xf;
      40     1390489 :                 if(!gn)
      41      142906 :                     src_fmt= code&8;
      42     1390489 :                 if(gn != next_gn) invalid_psc++;
      43       20823 :                 else              valid_psc++;
      44             : 
      45     1390489 :                 if(src_fmt){ // CIF
      46             :                     static const int lut[16]={1,2,3,4,5,6,7,8,9,10,11,12,0,16,16,16};
      47      220123 :                     next_gn = lut[gn];
      48             :                 }else{       //QCIF
      49             :                     static const int lut[16]={1,3,16,5,16,0,16,16,16,16,16,16,16,16,16,16};
      50     1170366 :                     next_gn = lut[gn];
      51             :                 }
      52             :             }
      53             :         }
      54             :     }
      55        6130 :     if(valid_psc > 2*invalid_psc + 6){
      56           0 :         return AVPROBE_SCORE_EXTENSION;
      57        6130 :     }else if(valid_psc > 2*invalid_psc + 2)
      58           0 :         return AVPROBE_SCORE_EXTENSION / 2;
      59        6130 :     return 0;
      60             : }
      61             : 
      62             : FF_DEF_RAWVIDEO_DEMUXER(h261, "raw H.261", h261_probe, "h261", AV_CODEC_ID_H261)

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