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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_EIT_SECTION_H
#define _UCSI_DVB_EIT_SECTION_H 1
#ifdef __cplusplus
extern "C"
{
#endif
#include <libucsi/section.h>
#include <libucsi/dvb/types.h>
/**
* dvb_eit_section structure.
*/
struct dvb_eit_section {
struct section_ext head;
uint16_t transport_stream_id;
uint16_t original_network_id;
uint8_t segment_last_section_number;
uint8_t last_table_id;
/* struct eit_event events[] */
} __ucsi_packed;
/**
* An entry in the events field of a dvb_eit_section.
*/
struct dvb_eit_event {
uint16_t event_id;
dvbdate_t start_time;
dvbduration_t duration;
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_eit_section.
*
* @param section Pointer to a generic section_ext structure.
* @return Pointer to a dvb_eit_section, or NULL on error.
*/
struct dvb_eit_section *dvb_eit_section_codec(struct section_ext *section);
/**
* Accessor for the service_id field of an EIT.
*
* @param eit EIT pointer.
* @return The service_id.
*/
static inline uint16_t dvb_eit_section_service_id(struct dvb_eit_section *eit)
{
return eit->head.table_id_ext;
}
/**
* Iterator for the events field of a dvb_eit_section.
*
* @param eit dvb_eit_section pointer.
* @param pos Variable containing a pointer to the current dvb_eit_event.
*/
#define dvb_eit_section_events_for_each(eit, pos) \
for ((pos) = dvb_eit_section_events_first(eit); \
(pos); \
(pos) = dvb_eit_section_events_next(eit, pos))
/**
* Iterator for the descriptors field of a dvb_eit_event.
*
* @param eit dvb_eit_event pointer.
* @param pos Variable containing a pointer to the current descriptor.
*/
#define dvb_eit_event_descriptors_for_each(event, pos) \
for ((pos) = dvb_eit_event_descriptors_first(event); \
(pos); \
(pos) = dvb_eit_event_descriptors_next(event, pos))
/******************************** PRIVATE CODE ********************************/
static inline struct dvb_eit_event *
dvb_eit_section_events_first(struct dvb_eit_section *eit)
{
size_t pos = sizeof(struct dvb_eit_section);
if (pos >= section_ext_length(&eit->head))
return NULL;
return (struct dvb_eit_event*) ((uint8_t *) eit + pos);
}
static inline struct dvb_eit_event *
dvb_eit_section_events_next(struct dvb_eit_section *eit,
struct dvb_eit_event *pos)
{
uint8_t *end = (uint8_t*) eit + section_ext_length(&eit->head);
uint8_t *next = (uint8_t *) pos +
sizeof(struct dvb_eit_event) +
pos->descriptors_loop_length;
if (next >= end)
return NULL;
return (struct dvb_eit_event *) next;
}
static inline struct descriptor *
dvb_eit_event_descriptors_first(struct dvb_eit_event * t)
{
if (t->descriptors_loop_length == 0)
return NULL;
return (struct descriptor *)
((uint8_t *) t + sizeof(struct dvb_eit_event));
}
static inline struct descriptor *
dvb_eit_event_descriptors_next(struct dvb_eit_event * t,
struct descriptor* pos)
{
return next_descriptor((uint8_t*) t + sizeof(struct dvb_eit_event),
t->descriptors_loop_length,
pos);
}
#ifdef __cplusplus
}
#endif
#endif
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