LCOV - code coverage report
Current view: top level - libavformat - dvbsub.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 24 26 92.3 %
Date: 2017-12-14 01:15:32 Functions: 1 1 100.0 %

          Line data    Source code
       1             : /*
       2             :  * RAW dvbsub demuxer
       3             :  * Copyright (c) 2015 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 "libavutil/intreadwrite.h"
      23             : 
      24             : #include "avformat.h"
      25             : #include "rawdec.h"
      26             : 
      27             : 
      28        6130 : static int dvbsub_probe(AVProbeData *p)
      29             : {
      30             :     int i, j, k;
      31        6130 :     const uint8_t *end = p->buf + p->buf_size;
      32             :     int type, len;
      33        6130 :     int max_score = 0;
      34             : 
      35   128280795 :     for(i=0; i<p->buf_size; i++){
      36   128274665 :         if (p->buf[i] == 0x0f) {
      37      914337 :             const uint8_t *ptr = p->buf + i;
      38      914337 :             uint8_t histogram[6] = {0};
      39      914337 :             int min = 255;
      40      926973 :             for(j=0; 6 < end - ptr; j++) {
      41      926880 :                 if (*ptr != 0x0f)
      42       12603 :                     break;
      43      914277 :                 type    = ptr[1];
      44             :                 //page_id = AV_RB16(ptr + 2);
      45      914277 :                 len     = AV_RB16(ptr + 4);
      46      914277 :                 if (type == 0x80) {
      47             :                     ;
      48      912599 :                 } else if (type >= 0x10 && type <= 0x14) {
      49       17367 :                     histogram[type - 0x10] ++;
      50             :                 } else
      51             :                     break;
      52       19045 :                 if (6 + len > end - ptr)
      53        6409 :                     break;
      54       12636 :                 ptr += 6 + len;
      55             :             }
      56     4571685 :             for (k=0; k < 4; k++) {
      57     3657348 :                 min = FFMIN(min, histogram[k]);
      58             :             }
      59      914337 :             if (min && j > max_score)
      60           0 :                 max_score = j;
      61             :         }
      62             :     }
      63             : 
      64        6130 :     if (max_score > 5)
      65           0 :         return AVPROBE_SCORE_EXTENSION;
      66             : 
      67        6130 :     return 0;
      68             : }
      69             : 
      70             : FF_DEF_RAWSUB_DEMUXER(dvbsub, "raw dvbsub", dvbsub_probe, NULL, AV_CODEC_ID_DVB_SUBTITLE, AVFMT_GENERIC_INDEX)

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