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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_STT_SECTION_H
#define _UCSI_ATSC_STT_SECTION_H 1
#ifdef __cplusplus
extern "C"
{
#endif
#include <libucsi/atsc/section.h>
#include <libucsi/atsc/types.h>
/**
* atsc_stt_section structure.
*/
struct atsc_stt_section {
struct atsc_section_psip head;
atsctime_t system_time;
uint8_t gps_utc_offset;
EBIT4(uint16_t DS_status : 1; ,
uint16_t reserved : 2; ,
uint16_t DS_day_of_month : 5; ,
uint16_t DS_hour : 8; );
/* struct descriptor descriptors[] */
} __ucsi_packed;
/**
* Process a atsc_stt_section.
*
* @param section Pointer to an atsc_section_psip structure.
* @return atsc_stt_section pointer, or NULL on error.
*/
struct atsc_stt_section *atsc_stt_section_codec(struct atsc_section_psip *section);
/**
* Iterator for the services field in a atsc_stt_section.
*
* @param stt atsc_stt_section pointer.
* @param pos Variable containing a pointer to the current descriptor.
*/
#define atsc_stt_section_descriptors_for_each(stt, pos) \
for ((pos) = atsc_stt_section_descriptors_first(stt); \
(pos); \
(pos) = atsc_stt_section_descriptors_next(stt, pos))
/******************************** PRIVATE CODE ********************************/
static inline struct descriptor *
atsc_stt_section_descriptors_first(struct atsc_stt_section *stt)
{
size_t pos = sizeof(struct atsc_stt_section);
if (pos >= section_ext_length(&stt->head.ext_head))
return NULL;
return (struct descriptor*) ((uint8_t *) stt + pos);
}
static inline struct descriptor *
atsc_stt_section_descriptors_next(struct atsc_stt_section *stt,
struct descriptor *pos)
{
int len = section_ext_length(&stt->head.ext_head);
len -= sizeof(struct atsc_stt_section);
return next_descriptor((uint8_t*) stt + sizeof(struct atsc_stt_section),
len,
pos);
}
#ifdef __cplusplus
}
#endif
#endif
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