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