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50 lines
1.6 KiB
50 lines
1.6 KiB
/* |
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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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