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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_ATSC_EIT_SECTION_H
#define _UCSI_ATSC_EIT_SECTION_H 1
#ifdef __cplusplus
extern "C"
{
#endif
#include <libucsi/atsc/section.h>
#include <libucsi/atsc/types.h>
/**
* atsc_eit_section structure.
*/
struct atsc_eit_section {
struct atsc_section_psip head;
uint8_t num_events_in_section;
/* struct atsc_eit_event events[] */
} __ucsi_packed;
struct atsc_eit_event {
EBIT2(uint16_t reserved : 2; ,
uint16_t event_id :14; );
atsctime_t start_time;
EBIT4(uint32_t reserved1 : 2; ,
uint32_t ETM_location : 2; ,
uint32_t length_in_seconds :20; ,
uint32_t title_length : 8; );
/* struct atsc_text title_text */
/* struct atsc_eit_event_part2 part2 */
} __ucsi_packed;
struct atsc_eit_event_part2 {
EBIT2(uint16_t reserved : 4; ,
uint16_t descriptors_length :12; );
/* struct descriptor descriptors[] */
} __ucsi_packed;
/**
* Process a atsc_eit_section.
*
* @param section Pointer to an atsc_section_psip structure.
* @return atsc_eit_section pointer, or NULL on error.
*/
struct atsc_eit_section *atsc_eit_section_codec(struct atsc_section_psip *section);
/**
* Accessor for the source_id field of an EIT.
*
* @param eit EIT pointer.
* @return The source_id .
*/
static inline uint16_t atsc_eit_section_source_id(struct atsc_eit_section *eit)
{
return eit->head.ext_head.table_id_ext;
}
/**
* Iterator for the events field in an atsc_eit_section.
*
* @param eit atsc_eit_section pointer.
* @param pos Variable containing a pointer to the current atsc_eit_event.
* @param idx Integer used to count which event we are in.
*/
#define atsc_eit_section_events_for_each(eit, pos, idx) \
for ((pos) = atsc_eit_section_events_first(eit), idx=0; \
(pos); \
(pos) = atsc_eit_section_events_next(eit, pos, ++idx))
/**
* Accessor for the title_text field of an atsc_eit_event.
*
* @param event atsc_eit_event pointer.
* @return struct atsc_text pointer, or NULL on error.
*/
static inline struct atsc_text *atsc_eit_event_name_title_text(struct atsc_eit_event *event)
{
if (event->title_length == 0)
return NULL;
return (struct atsc_text*)(((uint8_t*) event) + sizeof(struct atsc_eit_event));
}
/**
* Accessor for the part2 field of an atsc_eit_event.
*
* @param event atsc_eit_event pointer.
* @return struct atsc_eit_event_part2 pointer.
*/
static inline struct atsc_eit_event_part2 *atsc_eit_event_part2(struct atsc_eit_event *event)
{
return (struct atsc_eit_event_part2 *)
(((uint8_t*) event) + sizeof(struct atsc_eit_event) + event->title_length);
}
/**
* Iterator for the descriptors field in a atsc_eit_section structure.
*
* @param part2 atsc_eit_event_part2 pointer.
* @param pos Variable containing a pointer to the current descriptor.
*/
#define atsc_eit_event_part2_descriptors_for_each(part2, pos) \
for ((pos) = atsc_eit_event_part2_descriptors_first(part2); \
(pos); \
(pos) = atsc_eit_event_part2_descriptors_next(part2, pos))
/******************************** PRIVATE CODE ********************************/
static inline struct atsc_eit_event *
atsc_eit_section_events_first(struct atsc_eit_section *eit)
{
size_t pos = sizeof(struct atsc_eit_section);
if (eit->num_events_in_section == 0)
return NULL;
return (struct atsc_eit_event*) (((uint8_t *) eit) + pos);
}
static inline struct atsc_eit_event *
atsc_eit_section_events_next(struct atsc_eit_section *eit,
struct atsc_eit_event *pos,
int idx)
{
if (idx >= eit->num_events_in_section)
return NULL;
struct atsc_eit_event_part2 *part2 = atsc_eit_event_part2(pos);
int len = sizeof(struct atsc_eit_event_part2);
len += part2->descriptors_length;
return (struct atsc_eit_event *) (((uint8_t*) part2) + len);
}
static inline struct descriptor *
atsc_eit_event_part2_descriptors_first(struct atsc_eit_event_part2 *part2)
{
size_t pos = sizeof(struct atsc_eit_event_part2);
if (part2->descriptors_length == 0)
return NULL;
return (struct descriptor*) (((uint8_t *) part2) + pos);
}
static inline struct descriptor *
atsc_eit_event_part2_descriptors_next(struct atsc_eit_event_part2 *part2,
struct descriptor *pos)
{
return next_descriptor((uint8_t*) part2 + sizeof(struct atsc_eit_event_part2),
part2->descriptors_length,
pos);
}
#ifdef __cplusplus
}
#endif
#endif
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