/*
  * 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)