FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavformat/dvbtxt.c
Date: 2022-12-05 20:26:17
Exec Total Coverage
Lines: 9 12 75.0%
Functions: 1 1 100.0%
Branches: 7 12 58.3%

Line Branch Exec Source
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 6782 static int dvbtxt_probe(const AVProbeData *p)
28 {
29 6782 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
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6782 if ((p->buf_size + 45) % 184 != 0)
35 6780 return 0;
36
37
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2 if (!ff_data_identifier_is_teletext(p->buf[0]))
38 1 return 0;
39
40
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1 for (buf = p->buf + 1; buf < end; buf += 46) {
41
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1 if (!ff_data_unit_id_is_teletext(buf[0]) && buf[0] != 0xff)
42 1 return 0;
43 if (buf[1] != 0x2c) // data_unit_length
44 return 0;
45 }
46
47 return AVPROBE_SCORE_MAX / 2;
48 }
49
50 FF_DEF_RAWSUB_DEMUXER(dvbtxt, "dvbtxt", dvbtxt_probe, NULL, AV_CODEC_ID_DVB_TELETEXT, 0)
51