| /* |
| * 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(const 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) |