LCOV - code coverage report
Current view: top level - src/libavformat - dvbtxt.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 6 12 50.0 %
Date: 2017-01-24 04:42:20 Functions: 1 1 100.0 %

          Line data    Source code
       1             : /*
       2             :  * RAW dvb teletext demuxer
       3             :  * Copyright (c) 2016 Marton Balnt <cus@passwd.hu>
       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/dvbtxt.h"
      23             : 
      24             : #include "avformat.h"
      25             : #include "rawdec.h"
      26             : 
      27        5563 : static int dvbtxt_probe(AVProbeData *p)
      28             : {
      29        5563 :     const uint8_t *end = p->buf + p->buf_size;
      30             :     const uint8_t *buf;
      31             : 
      32             :     /* The purpose of this is demuxer is to detect DVB teletext streams in
      33             :      * mpegts, so we reject invalid buffer sizes */
      34        5563 :     if ((p->buf_size + 45) % 184 != 0)
      35        5561 :         return 0;
      36             : 
      37           2 :     if (!ff_data_identifier_is_teletext(p->buf[0]))
      38           2 :         return 0;
      39             : 
      40           0 :     for (buf = p->buf + 1; buf < end; buf += 46) {
      41           0 :         if (!ff_data_unit_id_is_teletext(buf[0]) && buf[0] != 0xff)
      42           0 :             return 0;
      43           0 :         if (buf[1] != 0x2c)     // data_unit_length
      44           0 :             return 0;
      45             :     }
      46             : 
      47           0 :     return AVPROBE_SCORE_MAX / 2;
      48             : }
      49             : 
      50             : FF_DEF_RAWSUB_DEMUXER(dvbtxt, "dvbtxt", dvbtxt_probe, NULL, AV_CODEC_ID_DVB_TELETEXT, 0)

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