blob: ff88fcf0b2e776680e394b9f51f0113b689873ba
| 1 | /* |
| 2 | * DVB teletext common functions. |
| 3 | * |
| 4 | * This file is part of FFmpeg. |
| 5 | * |
| 6 | * FFmpeg is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU Lesser General Public |
| 8 | * License as published by the Free Software Foundation; either |
| 9 | * version 2.1 of the License, or (at your option) any later version. |
| 10 | * |
| 11 | * FFmpeg is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | * Lesser General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU Lesser General Public |
| 17 | * License along with FFmpeg; if not, write to the Free Software |
| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 19 | */ |
| 20 | |
| 21 | #ifndef AVCODEC_DVBTXT_H |
| 22 | #define AVCODEC_DVBTXT_H |
| 23 | |
| 24 | #include "libavutil/attributes.h" |
| 25 | |
| 26 | /* Returns true if data identifier matches a teletext stream according to EN |
| 27 | * 301 775 section 4.4.2 */ |
| 28 | static av_always_inline int ff_data_identifier_is_teletext(int data_identifier) |
| 29 | { |
| 30 | return (data_identifier >= 0x10 && data_identifier <= 0x1F || |
| 31 | data_identifier >= 0x99 && data_identifier <= 0x9B); |
| 32 | } |
| 33 | |
| 34 | /* Returns true if data unit id matches EBU teletext data according to |
| 35 | * EN 301 775 section 4.4.2 */ |
| 36 | static av_always_inline int ff_data_unit_id_is_teletext(int data_unit_id) |
| 37 | { |
| 38 | return (data_unit_id == 0x02 || data_unit_id == 0x03); |
| 39 | } |
| 40 | |
| 41 | #endif /* AVCODEC_DVBTXT_H */ |
| 42 |