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/*
* 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 <libucsi/section.h>
/**
* 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
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