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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_BAT_SECTION_H
#define _UCSI_DVB_BAT_SECTION_H 1
#ifdef __cplusplus
extern "C"
{
#endif
#include <libucsi/section.h>
/**
* dvb_bat_section structure.
*/
struct dvb_bat_section {
struct section_ext head;
EBIT2(uint16_t reserved_1 : 4; ,
uint16_t bouquet_descriptors_length :12; );
/* struct descriptor descriptors[] */
/* struct dvb_bat_section_part2 part2 */
};
/**
* Second part of a dvb_bat_section, following the variable length descriptors field.
*/
struct dvb_bat_section_part2 {
EBIT2(uint16_t reserved_2 : 4; ,
uint16_t transport_stream_loop_length :12; );
/* struct dvb_bat_transport transports[] */
} __ucsi_packed;
/**
* An entry in the transports field of a dvb_bat_section_part2.
*/
struct dvb_bat_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[] */
};
/**
* Process a dvb_bat_section.
*
* @param section Generic section pointer.
* @return dvb_bat_section pointer, or NULL on error.
*/
struct dvb_bat_section *dvb_bat_section_codec(struct section_ext *section);
/**
* Accessor for the bouquet_id field of a BAT.
*
* @param bat BAT pointer.
* @return The bouquet_id.
*/
static inline uint16_t dvb_bat_section_bouquet_id(struct dvb_bat_section *bat)
{
return bat->head.table_id_ext;
}
/**
* Iterator for the descriptors field in a dvb_bat_section.
*
* @param bat dvb_bat_section pointer.
* @param pos Variable containing a pointer to the current descriptor.
*/
#define dvb_bat_section_descriptors_for_each(bat, pos) \
for ((pos) = dvb_bat_section_descriptors_first(bat); \
(pos); \
(pos) = dvb_bat_section_descriptors_next(bat, pos))
/**
* Accessor for the second part of a dvb_bat_section.
*
* @param bat dvb_bat_section pointer.
* @return dvb_bat_section_part2 pointer.
*/
static inline struct dvb_bat_section_part2 *
dvb_bat_section_part2(struct dvb_bat_section *bat)
{
return (struct dvb_bat_section_part2 *)
((uint8_t*) bat +
sizeof(struct dvb_bat_section) +
bat->bouquet_descriptors_length);
}
/**
* Iterator for the transports field of a dvb_bat_section_part2.
*
* @param part2 dvb_bat_section_part2 pointer.
* @param pos Variable containing a pointer to the current dvb_bat_transport.
*/
#define dvb_bat_section_transports_for_each(part2, pos) \
for ((pos) = dvb_bat_section_transports_first(part2); \
(pos); \
(pos) = dvb_bat_section_transports_next(part2, pos))
/**
* Iterator for the descriptors field of a dvb_bat_transport.
*
* @param transport dvb_bat_transport pointer.
* @param pos Variable containing a pointer to the current descriptor.
*/
#define dvb_bat_transport_descriptors_for_each(transport, pos) \
for ((pos) = dvb_bat_transport_descriptors_first(transport); \
(pos); \
(pos) = dvb_bat_transport_descriptors_next(transport, pos))
/******************************** PRIVATE CODE ********************************/
static inline struct descriptor *
dvb_bat_section_descriptors_first(struct dvb_bat_section *bat)
{
if (bat->bouquet_descriptors_length == 0)
return NULL;
return (struct descriptor *)
((uint8_t *) bat + sizeof(struct dvb_bat_section));
}
static inline struct descriptor *
dvb_bat_section_descriptors_next(struct dvb_bat_section *bat,
struct descriptor* pos)
{
return next_descriptor((uint8_t*) bat + sizeof(struct dvb_bat_section),
bat->bouquet_descriptors_length,
pos);
}
static inline struct dvb_bat_transport *
dvb_bat_section_transports_first(struct dvb_bat_section_part2 *part2)
{
if (part2->transport_stream_loop_length == 0)
return NULL;
return (struct dvb_bat_transport *)
((uint8_t *) part2 + sizeof(struct dvb_bat_section_part2));
}
static inline struct dvb_bat_transport *
dvb_bat_section_transports_next(struct dvb_bat_section_part2 *part2,
struct dvb_bat_transport *pos)
{
uint8_t *end = (uint8_t*) part2 + sizeof(struct dvb_bat_section_part2) +
part2->transport_stream_loop_length;
uint8_t *next = (uint8_t*) pos + sizeof(struct dvb_bat_transport) +
pos->transport_descriptors_length;
if (next >= end)
return NULL;
return (struct dvb_bat_transport *) next;
}
static inline struct descriptor *
dvb_bat_transport_descriptors_first(struct dvb_bat_transport *t)
{
if (t->transport_descriptors_length == 0)
return NULL;
return (struct descriptor *)
((uint8_t*)t + sizeof(struct dvb_bat_transport));
}
static inline struct descriptor *
dvb_bat_transport_descriptors_next(struct dvb_bat_transport *t,
struct descriptor* pos)
{
return next_descriptor((uint8_t*) t + sizeof(struct dvb_bat_transport),
t->transport_descriptors_length,
pos);
}
#ifdef __cplusplus
}
#endif
#endif
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