From ab959d7b4194715870128e616b8e29d4a101e488 Mon Sep 17 00:00:00 2001 From: etobi Date: Tue, 3 Sep 2013 09:48:41 +0200 Subject: Imported Upstream version 1.1.1+rev1207 --- lib/libucsi/dvb/nit_section.h | 207 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 207 insertions(+) create mode 100644 lib/libucsi/dvb/nit_section.h (limited to 'lib/libucsi/dvb/nit_section.h') diff --git a/lib/libucsi/dvb/nit_section.h b/lib/libucsi/dvb/nit_section.h new file mode 100644 index 0000000..77ab1a0 --- /dev/null +++ b/lib/libucsi/dvb/nit_section.h @@ -0,0 +1,207 @@ +/* + * 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_NIT_SECTION_H +#define _UCSI_DVB_NIT_SECTION_H 1 + +#ifdef __cplusplus +extern "C" +{ +#endif + +#include + +/** + * dvb_nit_section structure. + */ +struct dvb_nit_section { + struct section_ext head; + + EBIT2(uint16_t reserved_1 : 4; , + uint16_t network_descriptors_length :12; ); + /* struct descriptor descriptors[] */ + /* struct dvb_nit_section_part2 part2 */ +}; + +/** + * Second part of a dvb_nit_section, following the variable length descriptors field. + */ +struct dvb_nit_section_part2 { + EBIT2(uint16_t reserved_2 : 4; , + uint16_t transport_stream_loop_length :12; ); + /* struct dvb_nit_transport transports[] */ +} __ucsi_packed; + +/** + * An entry in the transports field of a dvb_nit_section_part2 + */ +struct dvb_nit_transport { + uint16_t transport_stream_id; + uint16_t original_network_id; + EBIT2(uint16_t reserved : 4; , + uint16_t transport_descriptors_length :12; ); + /* struct descriptor descriptors[] */ +} __ucsi_packed; + +/** + * Process a dvb_nit_section. + * + * @param section Generic section_ext pointer. + * @return dvb_nit_section pointer, or NULL on error. + */ +struct dvb_nit_section * dvb_nit_section_codec(struct section_ext *section); + +/** + * Accessor for the network_id field of a NIT. + * + * @param nit NIT pointer. + * @return The network_id. + */ +static inline uint16_t dvb_nit_section_network_id(struct dvb_nit_section *nit) +{ + return nit->head.table_id_ext; +} + +/** + * Iterator over the descriptors field in a dvb_nit_section. + * + * @param nit dvb_nit_section pointer. + * @param pos Variable containing a pointer to the current descriptor. + */ +#define dvb_nit_section_descriptors_for_each(nit, pos) \ + for ((pos) = dvb_nit_section_descriptors_first(nit); \ + (pos); \ + (pos) = dvb_nit_section_descriptors_next(nit, pos)) + +/** + * Accessor for a pointer to the dvb_nit_section_part2 structure. + * + * @param nit dvb_nit_section pointer. + * @return dvb_nit_section_part2 pointer. + */ +static inline struct dvb_nit_section_part2 *dvb_nit_section_part2(struct dvb_nit_section * nit) +{ + return (struct dvb_nit_section_part2 *) + ((uint8_t*) nit + sizeof(struct dvb_nit_section) + + nit->network_descriptors_length); +} + +/** + * Iterator over the transports field in a dvb_nit_section_part2. + * + * @param nit dvb_nit_section pointer. + * @param part2 dvb_nit_section_part2 pointer. + * @param pos Pointer to the current dvb_nit_transport. + */ +#define dvb_nit_section_transports_for_each(nit, part2, pos) \ + for ((pos) = dvb_nit_section_transports_first(part2); \ + (pos); \ + (pos) = dvb_nit_section_transports_next(part2, pos)) + +/** + * Iterator over the descriptors field in a dvb_nit_transport. + * + * @param transport dvb_nit_transport pointer. + * @param pos Pointer to the current descriptor. + */ +#define dvb_nit_transport_descriptors_for_each(transport, pos) \ + for ((pos) = dvb_nit_transport_descriptors_first(transport); \ + (pos); \ + (pos) = dvb_nit_transport_descriptors_next(transport, pos)) + + + + + + + + + + +/******************************** PRIVATE CODE ********************************/ +static inline struct descriptor * + dvb_nit_section_descriptors_first(struct dvb_nit_section * nit) +{ + if (nit->network_descriptors_length == 0) + return NULL; + + return (struct descriptor *) + ((uint8_t *) nit + sizeof(struct dvb_nit_section)); +} + +static inline struct descriptor * + dvb_nit_section_descriptors_next(struct dvb_nit_section * nit, + struct descriptor* pos) +{ + return next_descriptor((uint8_t*) nit + sizeof(struct dvb_nit_section), + nit->network_descriptors_length, + pos); +} + +static inline struct dvb_nit_transport * + dvb_nit_section_transports_first(struct dvb_nit_section_part2 *part2) +{ + if (part2->transport_stream_loop_length == 0) + return NULL; + + return (struct dvb_nit_transport *) + ((uint8_t *)part2 + sizeof(struct dvb_nit_section_part2)); +} + +static inline struct dvb_nit_transport * + dvb_nit_section_transports_next(struct dvb_nit_section_part2 *part2, + struct dvb_nit_transport *pos) +{ + uint8_t *end = (uint8_t*) part2 + sizeof(struct dvb_nit_section_part2) + + part2->transport_stream_loop_length; + uint8_t *next = (uint8_t*) pos + sizeof(struct dvb_nit_transport) + + pos->transport_descriptors_length; + + if (next >= end) + return NULL; + + return (struct dvb_nit_transport *) next; +} + +static inline struct descriptor * + dvb_nit_transport_descriptors_first(struct dvb_nit_transport *t) +{ + if (t->transport_descriptors_length == 0) + return NULL; + + return (struct descriptor *) + ((uint8_t*) t + sizeof(struct dvb_nit_transport)); +} + +static inline struct descriptor * + dvb_nit_transport_descriptors_next(struct dvb_nit_transport *t, + struct descriptor* pos) +{ + return next_descriptor((uint8_t*) t + sizeof(struct dvb_nit_transport), + t->transport_descriptors_length, + pos); +} + +#ifdef __cplusplus +} +#endif + +#endif -- cgit v1.2.3