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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_SIT_SECTION_H
#define _UCSI_DVB_SIT_SECTION_H 1
#ifdef __cplusplus
extern "C"
{
#endif
#include <libucsi/section.h>
/**
* dvb_sit_section structure.
*/
struct dvb_sit_section {
struct section_ext head;
EBIT2(uint16_t reserved : 4; ,
uint16_t transmission_info_loop_length :12; );
/* struct descriptor descriptors[] */
/* struct dvb_sit_service services[] */
};
/**
* An entry in the services field of a dvb_sit_section.
*/
struct dvb_sit_service {
uint16_t service_id;
EBIT3(uint16_t reserved : 1; ,
uint16_t running_status : 3; ,
uint16_t service_loop_length :12; );
/* struct descriptor descriptors[] */
};
/**
* Process a dvb_sit_section.
*
* @param section Generic section_ext structure.
* @return dvb_sit_section pointer, or NULL on error.
*/
struct dvb_sit_section * dvb_sit_section_codec(struct section_ext *section);
/**
* Iterator for descriptors field in a dvb_sit_section.
*
* @param sit dvb_sit_section Pointer.
* @param pos Variable holding pointer to current descriptor.
*/
#define dvb_sit_section_descriptors_for_each(sit, pos) \
for ((pos) = dvb_sit_section_descriptors_first(sit); \
(pos); \
(pos) = dvb_sit_section_descriptors_first(sit))
/**
* Iterator for services field in a dvb_sit_section.
*
* @param sit dvb_sit_section Pointer.
* @param pos Variable holding pointer to current dvb_sit_service.
*/
#define dvb_sit_section_services_for_each(sit, pos) \
for ((pos) = dvb_sit_section_services_first(sit); \
(pos); \
(pos) = dvb_sit_section_services_next(sit, pos))
/**
* Iterator for descriptors field in a dvb_sit_service.
*
* @param service dvb_sit_service Pointer.
* @param pos Variable holding pointer to current descriptor.
*/
#define dvb_sit_service_descriptors_for_each(service, pos) \
for ((pos) = dvb_sit_service_descriptors_first(service); \
(pos); \
(pos) = dvb_sit_service_descriptors_next(service, pos))
/******************************** PRIVATE CODE ********************************/
static inline struct descriptor *
dvb_sit_section_descriptors_first(struct dvb_sit_section *sit)
{
if (sit->transmission_info_loop_length == 0)
return NULL;
return (struct descriptor *)
((uint8_t *) sit + sizeof(struct dvb_sit_section));
}
static inline struct descriptor *
dvb_sit_section_descriptors_next(struct dvb_sit_section *sit,
struct descriptor* pos)
{
return next_descriptor((uint8_t*) sit + sizeof(struct dvb_sit_section),
sit->transmission_info_loop_length,
pos);
}
static inline struct dvb_sit_service *
dvb_sit_section_services_first(struct dvb_sit_section *sit)
{
size_t pos = sizeof(struct dvb_sit_section) + sit->transmission_info_loop_length;
if (pos >= section_ext_length(&sit->head))
return NULL;
return (struct dvb_sit_service*) ((uint8_t *) sit + pos);
}
static inline struct dvb_sit_service *
dvb_sit_section_services_next(struct dvb_sit_section *sit,
struct dvb_sit_service *pos)
{
uint8_t *end = (uint8_t*) sit + section_ext_length(&sit->head);
uint8_t *next = (uint8_t *) pos + sizeof(struct dvb_sit_service) +
pos->service_loop_length;
if (next >= end)
return NULL;
return (struct dvb_sit_service *) next;
}
static inline struct descriptor *
dvb_sit_service_descriptors_first(struct dvb_sit_service * t)
{
if (t->service_loop_length == 0)
return NULL;
return (struct descriptor *)
((uint8_t *) t + sizeof(struct dvb_sit_service));
}
static inline struct descriptor *
dvb_sit_service_descriptors_next(struct dvb_sit_service *t,
struct descriptor* pos)
{
return next_descriptor((uint8_t*) t + sizeof(struct dvb_sit_service),
t->service_loop_length,
pos);
}
#ifdef __cplusplus
}
#endif
#endif
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