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 */ ff_data_identifier_is_teletext(int data_identifier)28static 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 */ ff_data_unit_id_is_teletext(int data_unit_id)36static 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