51 lines
1.6 KiB
C
51 lines
1.6 KiB
C
/*
|
|
* RAW dvb teletext demuxer
|
|
* Copyright (c) 2016 Marton Balnt <cus@passwd.hu>
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "libavcodec/dvbtxt.h"
|
|
|
|
#include "avformat.h"
|
|
#include "rawdec.h"
|
|
|
|
static int dvbtxt_probe(AVProbeData *p)
|
|
{
|
|
const uint8_t *end = p->buf + p->buf_size;
|
|
const uint8_t *buf;
|
|
|
|
/* The purpose of this is demuxer is to detect DVB teletext streams in
|
|
* mpegts, so we reject invalid buffer sizes */
|
|
if ((p->buf_size + 45) % 184 != 0)
|
|
return 0;
|
|
|
|
if (!ff_data_identifier_is_teletext(p->buf[0]))
|
|
return 0;
|
|
|
|
for (buf = p->buf + 1; buf < end; buf += 46) {
|
|
if (!ff_data_unit_id_is_teletext(buf[0]) && buf[0] != 0xff)
|
|
return 0;
|
|
if (buf[1] != 0x2c) // data_unit_length
|
|
return 0;
|
|
}
|
|
|
|
return AVPROBE_SCORE_MAX / 2;
|
|
}
|
|
|
|
FF_DEF_RAWSUB_DEMUXER(dvbtxt, "dvbtxt", dvbtxt_probe, NULL, AV_CODEC_ID_DVB_TELETEXT, 0)
|