diff options
Diffstat (limited to 'lib/libucsi/dvb/data_broadcast_descriptor.h')
| -rw-r--r-- | lib/libucsi/dvb/data_broadcast_descriptor.h | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/lib/libucsi/dvb/data_broadcast_descriptor.h b/lib/libucsi/dvb/data_broadcast_descriptor.h new file mode 100644 index 0000000..069e1db --- /dev/null +++ b/lib/libucsi/dvb/data_broadcast_descriptor.h @@ -0,0 +1,139 @@ +/* + * section and descriptor parser + * + * Copyright (C) 2005 Kenneth Aafloy (kenneth@linuxtv.org) + * Copyright (C) 2005 Andrew de Quincey (adq_dvb@lidskialf.net) + * + * This library 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. + * + * This library 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 this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA + */ + +#ifndef _UCSI_DVB_DATA_BROADCAST_DESCRIPTOR +#define _UCSI_DVB_DATA_BROADCAST_DESCRIPTOR 1 + +#ifdef __cplusplus +extern "C" +{ +#endif + +#include <libucsi/descriptor.h> +#include <libucsi/endianops.h> +#include <libucsi/types.h> + +/** + * dvb_data_broadcast_descriptor structure. + */ +struct dvb_data_broadcast_descriptor { + struct descriptor d; + + uint16_t data_broadcast_id; + uint8_t component_tag; + uint8_t selector_length; + /* uint8_t selector[] */ + /* struct dvb_data_broadcast_descriptor_part2 part2 */ +} __ucsi_packed; + +/** + * Second part of a dvb_data_broadcast_descriptor following the variable length selector field. + */ +struct dvb_data_broadcast_descriptor_part2 { + iso639lang_t language_code; + uint8_t text_length; + /* uint8_t text[] */ +} __ucsi_packed; + +/** + * Process a dvb_data_broadcast_descriptor. + * + * @param d Generic descriptor pointer. + * @return dvb_data_broadcast_descriptor pointer, or NULL on error. + */ +static inline struct dvb_data_broadcast_descriptor* + dvb_data_broadcast_descriptor_codec(struct descriptor* d) +{ + struct dvb_data_broadcast_descriptor *p = + (struct dvb_data_broadcast_descriptor *) d; + struct dvb_data_broadcast_descriptor_part2 *p2; + uint8_t* buf = (uint8_t*) d + 2; + uint32_t pos = sizeof(struct dvb_data_broadcast_descriptor) - 2; + uint32_t len = d->len; + + if (pos > len) + return NULL; + + bswap16(buf + 2); + + pos += p->selector_length; + + if (pos > len) + return NULL; + + p2 = (struct dvb_data_broadcast_descriptor_part2*) (buf + 2 + pos); + + pos += sizeof(struct dvb_data_broadcast_descriptor_part2); + + if (pos > len) + return NULL; + + pos += p2->text_length; + + if (pos != len) + return NULL; + + return p; +} + +/** + * Accessor for the selector field of a dvb_data_broadcast_descriptor. + * + * @param d dvb_data_broadcast_descriptor pointer. + * @return pointer to the field. + */ +static inline uint8_t * + dvb_data_broadcast_descriptor_selector(struct dvb_data_broadcast_descriptor *d) +{ + return (uint8_t *) d + sizeof(struct dvb_data_broadcast_descriptor); +} + +/** + * Accessor for the second part of a dvb_data_broadcast_descriptor. + * + * @param d dvb_data_broadcast_descriptor pointer. + * @return dvb_data_broadcast_descriptor_part2 pointer. + */ +static inline struct dvb_data_broadcast_descriptor_part2 * + dvb_data_broadcast_descriptor_part2(struct dvb_data_broadcast_descriptor *d) +{ + return (struct dvb_data_broadcast_descriptor_part2*) + ((uint8_t*) d + sizeof(struct dvb_data_broadcast_descriptor) + + d->selector_length); +} + +/** + * Accessor for the text field in a dvb_data_broadcast_descriptor_part2. + * + * @param d dvb_data_broadcast_descriptor_part2 pointer. + * @return pointer to the field. + */ +static inline uint8_t * + dvb_data_broadcast_descriptor_part2_text(struct dvb_data_broadcast_descriptor_part2 *d) +{ + return (uint8_t *) d + sizeof(struct dvb_data_broadcast_descriptor_part2); +} + +#ifdef __cplusplus +} +#endif + +#endif |