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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_SDT_SECTION_H
#define _UCSI_DVB_SDT_SECTION_H 1
#ifdef __cplusplus
extern "C"
{
#endif
#include <libucsi/section.h>
/**
* dvb_sdt_section structure.
*/
struct dvb_sdt_section {
struct section_ext head;
uint16_t original_network_id;
uint8_t reserved;
/* struct dvb_sdt_service services[] */
} __ucsi_packed;
/**
* An entry in the services field of a dvb_sdt_section.
*/
struct dvb_sdt_service {
uint16_t service_id;
EBIT3(uint8_t reserved : 6; ,
uint8_t eit_schedule_flag : 1; ,
uint8_t eit_present_following_flag : 1; );
EBIT3(uint16_t running_status : 3; ,
uint16_t free_ca_mode : 1; ,
uint16_t descriptors_loop_length :12; );
/* struct descriptor descriptors[] */
} __ucsi_packed;
/**
* Process a dvb_sdt_section.
*
* @param section Pointer to a generic section_ext structure.
* @return dvb_sdt_section pointer, or NULL on error.
*/
struct dvb_sdt_section * dvb_sdt_section_codec(struct section_ext *section);
/**
* Accessor for the transport_stream_id field of an SDT.
*
* @param sdt SDT pointer.
* @return The transport_stream_id.
*/
static inline uint16_t dvb_sdt_section_transport_stream_id(struct dvb_sdt_section *sdt)
{
return sdt->head.table_id_ext;
}
/**
* Iterator for the services field in a dvb_sdt_section.
*
* @param sdt dvb_sdt_section pointer.
* @param pos Variable containing a pointer to the current dvb_sdt_service.
*/
#define dvb_sdt_section_services_for_each(sdt, pos) \
for ((pos) = dvb_sdt_section_services_first(sdt); \
(pos); \
(pos) = dvb_sdt_section_services_next(sdt, pos))
/**
* Iterator for the descriptors field in a dvb_sdt_service.
*
* @param service dvb_sdt_service pointer.
* @param pos Variable containing a pointer to the current descriptor.
*/
#define dvb_sdt_service_descriptors_for_each(service, pos) \
for ((pos) = dvb_sdt_service_descriptors_first(service); \
(pos); \
(pos) = dvb_sdt_service_descriptors_next(service, pos))
/******************************** PRIVATE CODE ********************************/
static inline struct dvb_sdt_service *
dvb_sdt_section_services_first(struct dvb_sdt_section * sdt)
{
size_t pos = sizeof(struct dvb_sdt_section);
if (pos >= section_ext_length(&sdt->head))
return NULL;
return (struct dvb_sdt_service*) ((uint8_t *) sdt + pos);
}
static inline struct dvb_sdt_service *
dvb_sdt_section_services_next(struct dvb_sdt_section * sdt,
struct dvb_sdt_service * pos)
{
uint8_t *end = (uint8_t*) sdt + section_ext_length(&sdt->head);
uint8_t *next = (uint8_t*) pos + sizeof(struct dvb_sdt_service) +
pos->descriptors_loop_length;
if (next >= end)
return NULL;
return (struct dvb_sdt_service *) next;
}
static inline struct descriptor *
dvb_sdt_service_descriptors_first(struct dvb_sdt_service *svc)
{
if (svc->descriptors_loop_length == 0)
return NULL;
return (struct descriptor *)
((uint8_t*) svc + sizeof(struct dvb_sdt_service));
}
static inline struct descriptor *
dvb_sdt_service_descriptors_next(struct dvb_sdt_service *svc,
struct descriptor* pos)
{
return next_descriptor((uint8_t*) svc + sizeof(struct dvb_sdt_service),
svc->descriptors_loop_length,
pos);
}
#ifdef __cplusplus
}
#endif
#endif
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