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208 lines
5.6 KiB
208 lines
5.6 KiB
/*
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* section and descriptor parser
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*
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* Copyright (C) 2005 Kenneth Aafloy (kenneth@linuxtv.org)
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* Copyright (C) 2005 Andrew de Quincey (adq_dvb@lidskialf.net)
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#ifndef _UCSI_DVB_NIT_SECTION_H
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#define _UCSI_DVB_NIT_SECTION_H 1
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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#include <libucsi/section.h>
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/**
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* dvb_nit_section structure.
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*/
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struct dvb_nit_section {
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struct section_ext head;
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EBIT2(uint16_t reserved_1 : 4; ,
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uint16_t network_descriptors_length :12; );
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/* struct descriptor descriptors[] */
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/* struct dvb_nit_section_part2 part2 */
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};
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/**
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* Second part of a dvb_nit_section, following the variable length descriptors field.
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*/
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struct dvb_nit_section_part2 {
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EBIT2(uint16_t reserved_2 : 4; ,
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uint16_t transport_stream_loop_length :12; );
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/* struct dvb_nit_transport transports[] */
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} __ucsi_packed;
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/**
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* An entry in the transports field of a dvb_nit_section_part2
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*/
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struct dvb_nit_transport {
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uint16_t transport_stream_id;
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uint16_t original_network_id;
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EBIT2(uint16_t reserved : 4; ,
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uint16_t transport_descriptors_length :12; );
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/* struct descriptor descriptors[] */
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} __ucsi_packed;
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/**
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* Process a dvb_nit_section.
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*
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* @param section Generic section_ext pointer.
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* @return dvb_nit_section pointer, or NULL on error.
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*/
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struct dvb_nit_section * dvb_nit_section_codec(struct section_ext *section);
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/**
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* Accessor for the network_id field of a NIT.
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*
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* @param nit NIT pointer.
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* @return The network_id.
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*/
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static inline uint16_t dvb_nit_section_network_id(struct dvb_nit_section *nit)
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{
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return nit->head.table_id_ext;
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}
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/**
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* Iterator over the descriptors field in a dvb_nit_section.
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*
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* @param nit dvb_nit_section pointer.
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* @param pos Variable containing a pointer to the current descriptor.
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*/
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#define dvb_nit_section_descriptors_for_each(nit, pos) \
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for ((pos) = dvb_nit_section_descriptors_first(nit); \
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(pos); \
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(pos) = dvb_nit_section_descriptors_next(nit, pos))
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/**
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* Accessor for a pointer to the dvb_nit_section_part2 structure.
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*
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* @param nit dvb_nit_section pointer.
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* @return dvb_nit_section_part2 pointer.
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*/
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static inline struct dvb_nit_section_part2 *dvb_nit_section_part2(struct dvb_nit_section * nit)
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{
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return (struct dvb_nit_section_part2 *)
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((uint8_t*) nit + sizeof(struct dvb_nit_section) +
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nit->network_descriptors_length);
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}
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/**
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* Iterator over the transports field in a dvb_nit_section_part2.
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*
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* @param nit dvb_nit_section pointer.
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* @param part2 dvb_nit_section_part2 pointer.
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* @param pos Pointer to the current dvb_nit_transport.
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*/
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#define dvb_nit_section_transports_for_each(nit, part2, pos) \
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for ((pos) = dvb_nit_section_transports_first(part2); \
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(pos); \
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(pos) = dvb_nit_section_transports_next(part2, pos))
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/**
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* Iterator over the descriptors field in a dvb_nit_transport.
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*
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* @param transport dvb_nit_transport pointer.
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* @param pos Pointer to the current descriptor.
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*/
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#define dvb_nit_transport_descriptors_for_each(transport, pos) \
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for ((pos) = dvb_nit_transport_descriptors_first(transport); \
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(pos); \
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(pos) = dvb_nit_transport_descriptors_next(transport, pos))
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/******************************** PRIVATE CODE ********************************/
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static inline struct descriptor *
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dvb_nit_section_descriptors_first(struct dvb_nit_section * nit)
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{
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if (nit->network_descriptors_length == 0)
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return NULL;
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return (struct descriptor *)
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((uint8_t *) nit + sizeof(struct dvb_nit_section));
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}
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static inline struct descriptor *
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dvb_nit_section_descriptors_next(struct dvb_nit_section * nit,
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struct descriptor* pos)
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{
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return next_descriptor((uint8_t*) nit + sizeof(struct dvb_nit_section),
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nit->network_descriptors_length,
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pos);
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}
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static inline struct dvb_nit_transport *
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dvb_nit_section_transports_first(struct dvb_nit_section_part2 *part2)
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{
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if (part2->transport_stream_loop_length == 0)
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return NULL;
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return (struct dvb_nit_transport *)
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((uint8_t *)part2 + sizeof(struct dvb_nit_section_part2));
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}
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static inline struct dvb_nit_transport *
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dvb_nit_section_transports_next(struct dvb_nit_section_part2 *part2,
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struct dvb_nit_transport *pos)
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{
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uint8_t *end = (uint8_t*) part2 + sizeof(struct dvb_nit_section_part2) +
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part2->transport_stream_loop_length;
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uint8_t *next = (uint8_t*) pos + sizeof(struct dvb_nit_transport) +
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pos->transport_descriptors_length;
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if (next >= end)
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return NULL;
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return (struct dvb_nit_transport *) next;
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}
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static inline struct descriptor *
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dvb_nit_transport_descriptors_first(struct dvb_nit_transport *t)
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{
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if (t->transport_descriptors_length == 0)
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return NULL;
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return (struct descriptor *)
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((uint8_t*) t + sizeof(struct dvb_nit_transport));
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}
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static inline struct descriptor *
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dvb_nit_transport_descriptors_next(struct dvb_nit_transport *t,
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struct descriptor* pos)
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{
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return next_descriptor((uint8_t*) t + sizeof(struct dvb_nit_transport),
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t->transport_descriptors_length,
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pos);
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}
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#ifdef __cplusplus
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}
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#endif
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#endif
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