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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_MGT_SECTION_H
#define _UCSI_ATSC_MGT_SECTION_H 1
#ifdef __cplusplus
extern "C"
{
#endif
#include <libucsi/atsc/section.h>
enum atsc_mgt_section_table_type {
ATSC_MGT_TABLE_TYPE_TVCT_CURRENT = 0,
ATSC_MGT_TABLE_TYPE_TVCT_NEXT = 1,
ATSC_MGT_TABLE_TYPE_CVCT_CURRENT = 2,
ATSC_MGT_TABLE_TYPE_CVCT_NEXT = 3,
ATSC_MGT_TABLE_TYPE_CHANNEL_ETT = 4,
ATSC_MGT_TABLE_TYPE_DCCSCT = 5,
};
/**
* atsc_mgt_section structure.
*/
struct atsc_mgt_section {
struct atsc_section_psip head;
uint16_t tables_defined;
/* struct atsc_mgt_table tables[] */
/* struct atsc_mgt_section_part2 part2 */
} __ucsi_packed;
struct atsc_mgt_table {
uint16_t table_type;
EBIT2(uint16_t reserved : 3; ,
uint16_t table_type_PID :13; );
EBIT2(uint8_t reserved1 : 3; ,
uint8_t table_type_version_number : 5; );
uint32_t number_bytes;
EBIT2(uint16_t reserved2 : 4; ,
uint16_t table_type_descriptors_length :12; );
/* struct descriptor descriptors[] */
} __ucsi_packed;
struct atsc_mgt_section_part2 {
EBIT2(uint16_t reserved : 4; ,
uint16_t descriptors_length :12; );
/* struct descriptor descriptors[] */
} __ucsi_packed;
static inline struct atsc_mgt_table * atsc_mgt_section_tables_first(struct atsc_mgt_section *mgt);
static inline struct atsc_mgt_table *
atsc_mgt_section_tables_next(struct atsc_mgt_section *mgt, struct atsc_mgt_table *pos, int idx);
/**
* Process a atsc_mgt_section.
*
* @param section Pointer to an atsc_section_psip structure.
* @return atsc_mgt_section pointer, or NULL on error.
*/
struct atsc_mgt_section *atsc_mgt_section_codec(struct atsc_section_psip *section);
/**
* Iterator for the tables field in an atsc_mgt_section.
*
* @param mgt atsc_mgt_section pointer.
* @param pos Variable containing a pointer to the current atsc_mgt_table.
* @param idx Integer used to count which table we in.
*/
#define atsc_mgt_section_tables_for_each(mgt, pos, idx) \
for ((pos) = atsc_mgt_section_tables_first(mgt), idx=0; \
(pos); \
(pos) = atsc_mgt_section_tables_next(mgt, pos, ++idx))
/**
* Iterator for the descriptors field in a atsc_mgt_table structure.
*
* @param table atsc_mgt_table pointer.
* @param pos Variable containing a pointer to the current descriptor.
*/
#define atsc_mgt_table_descriptors_for_each(table, pos) \
for ((pos) = atsc_mgt_table_descriptors_first(table); \
(pos); \
(pos) = atsc_mgt_table_descriptors_next(table, pos))
/**
* Accessor for the second part of an atsc_mgt_section.
*
* @param mgt atsc_mgt_section pointer.
* @return atsc_mgt_section_part2 pointer.
*/
static inline struct atsc_mgt_section_part2 *
atsc_mgt_section_part2(struct atsc_mgt_section *mgt)
{
int pos = sizeof(struct atsc_mgt_section);
struct atsc_mgt_table *cur_table;
int idx;
atsc_mgt_section_tables_for_each(mgt, cur_table, idx) {
pos += sizeof(struct atsc_mgt_table);
pos += cur_table->table_type_descriptors_length;
}
return (struct atsc_mgt_section_part2 *) (((uint8_t*) mgt) + pos);
}
/**
* Iterator for the descriptors field in a atsc_mgt_section structure.
*
* @param part2 atsc_mgt_section_part2 pointer.
* @param pos Variable containing a pointer to the current descriptor.
*/
#define atsc_mgt_section_part2_descriptors_for_each(part2, pos) \
for ((pos) = atsc_mgt_section_part2_descriptors_first(part2); \
(pos); \
(pos) = atsc_mgt_section_part2_descriptors_next(part2, pos))
/******************************** PRIVATE CODE ********************************/
static inline struct atsc_mgt_table *
atsc_mgt_section_tables_first(struct atsc_mgt_section *mgt)
{
size_t pos = sizeof(struct atsc_mgt_section);
if (mgt->tables_defined == 0)
return NULL;
return (struct atsc_mgt_table*) (((uint8_t *) mgt) + pos);
}
static inline struct atsc_mgt_table *
atsc_mgt_section_tables_next(struct atsc_mgt_section *mgt,
struct atsc_mgt_table *pos,
int idx)
{
if (idx >= mgt->tables_defined)
return NULL;
return (struct atsc_mgt_table *)
(((uint8_t*) pos) + sizeof(struct atsc_mgt_table) + pos->table_type_descriptors_length);
}
static inline struct descriptor *
atsc_mgt_table_descriptors_first(struct atsc_mgt_table *table)
{
size_t pos = sizeof(struct atsc_mgt_table);
if (table->table_type_descriptors_length == 0)
return NULL;
return (struct descriptor*) (((uint8_t *) table) + pos);
}
static inline struct descriptor *
atsc_mgt_table_descriptors_next(struct atsc_mgt_table *table,
struct descriptor *pos)
{
return next_descriptor((uint8_t*) table + sizeof(struct atsc_mgt_table),
table->table_type_descriptors_length,
pos);
}
static inline struct descriptor *
atsc_mgt_section_part2_descriptors_first(struct atsc_mgt_section_part2 *part2)
{
size_t pos = sizeof(struct atsc_mgt_section_part2);
if (part2->descriptors_length == 0)
return NULL;
return (struct descriptor*) (((uint8_t *) part2) + pos);
}
static inline struct descriptor *
atsc_mgt_section_part2_descriptors_next(struct atsc_mgt_section_part2 *part2,
struct descriptor *pos)
{
return next_descriptor((uint8_t*) part2 + sizeof(struct atsc_mgt_section_part2),
part2->descriptors_length,
pos);
}
#ifdef __cplusplus
}
#endif
#endif
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