/*
* 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_CVCT_SECTION_H
#define _UCSI_ATSC_CVCT_SECTION_H 1
#ifdef __cplusplus
extern "C"
{
#endif
#include <libucsi/atsc/section.h>
/**
* atsc_cvct_section structure.
*/
struct atsc_cvct_section {
struct atsc_section_psip head;
uint8_t num_channels_in_section;
/* struct atsc_cvct_channel channels[] */
/* struct atsc_cvct_channel_part2 part2 */
} __ucsi_packed;
struct atsc_cvct_channel {
uint16_t short_name[7]; // UTF-16 network ordered
EBIT4(uint32_t reserved : 4; ,
uint32_t major_channel_number :10; ,
uint32_t minor_channel_number :10; ,
uint32_t modulation_mode : 8; );
uint32_t carrier_frequency;
uint16_t channel_TSID;
uint16_t program_number;
EBIT8(uint16_t ETM_location : 2; ,
uint16_t access_controlled : 1; ,
uint16_t hidden : 1; ,
uint16_t path_select : 1; ,
uint16_t out_of_band : 1; ,
uint16_t hide_guide : 1; ,
uint16_t reserved2 : 3; ,
uint16_t service_type : 6; );
uint16_t source_id;
EBIT2(uint16_t reserved3 : 6; ,
uint16_t descriptors_length :10; );
/* struct descriptor descriptors[] */
} __ucsi_packed;
struct atsc_cvct_section_part2 {
EBIT2(uint16_t reserved : 6; ,
uint16_t descriptors_length :10; );
/* struct descriptor descriptors[] */
} __ucsi_packed;
static inline struct atsc_cvct_channel *atsc_cvct_section_channels_first(struct atsc_cvct_section *cvct);
static inline struct atsc_cvct_channel *
atsc_cvct_section_channels_next(struct atsc_cvct_section *cvct, struct atsc_cvct_channel *pos, int idx);
/**
* Process a atsc_cvct_section.
*
* @param section Pointer to anj atsc_section_psip structure.
* @return atsc_cvct_section pointer, or NULL on error.
*/
struct atsc_cvct_section *atsc_cvct_section_codec(struct atsc_section_psip *section);
/**
* Accessor for the transport_stream_id field of a CVCT.
*
* @param cvdt CVDT pointer.
* @return The transport_stream_id.
*/
static inline uint16_t atsc_cvct_section_transport_stream_id(struct atsc_cvct_section *cvct)
{
return cvct->head.ext_head.table_id_ext;
}
/**
* Iterator for the tables field in an atsc_cvct_section.
*
* @param mgt atsc_cvct_section pointer.
* @param pos Variable containing a pointer to the current atsc_cvct_channel.
* @param idx Integer used to count which table we in.
*/
#define atsc_cvct_section_channels_for_each(mgt, pos, idx) \
for ((pos) = atsc_cvct_section_channels_first(mgt), idx=0; \
(pos); \
(pos) = atsc_cvct_section_channels_next(mgt, pos, ++idx))
/**
* Iterator for the descriptors field in a atsc_cvct_channel structure.
*
* @param table atsc_cvct_channel pointer.
* @param pos Variable containing a pointer to the current descriptor.
*/
#define atsc_cvct_channel_descriptors_for_each(table, pos) \
for ((pos) = atsc_cvct_channel_descriptors_first(table); \
(pos); \
(pos) = atsc_cvct_channel_descriptors_next(table, pos))
/**
* Accessor for the second part of an atsc_cvct_section.
*
* @param mgt atsc_cvct_section pointer.
* @return atsc_cvct_section_part2 pointer.
*/
static inline struct atsc_cvct_section_part2 *
atsc_cvct_section_part2(struct atsc_cvct_section *mgt)
{
int pos = sizeof(struct atsc_cvct_section);
struct atsc_cvct_channel *cur_table;
int idx;
atsc_cvct_section_channels_for_each(mgt, cur_table, idx) {
pos += sizeof(struct atsc_cvct_channel);
pos += cur_table->descriptors_length;
}
return (struct atsc_cvct_section_part2 *) (((uint8_t*) mgt) + pos);
}
/**
* Iterator for the descriptors field in a atsc_cvct_section structure.
*
* @param part2 atsc_cvct_section_part2 pointer.
* @param pos Variable containing a pointer to the current descriptor.
*/
#define atsc_cvct_section_part2_descriptors_for_each(part2, pos) \
for ((pos) = atsc_cvct_section_part2_descriptors_first(part2); \
(pos); \
(pos) = atsc_cvct_section_part2_descriptors_next(part2, pos))
/******************************** PRIVATE CODE ********************************/
static inline struct atsc_cvct_channel *
atsc_cvct_section_channels_first(struct atsc_cvct_section *cvct)
{
size_t pos = sizeof(struct atsc_cvct_section);
if (cvct->num_channels_in_section == 0)
return NULL;
return (struct atsc_cvct_channel*) (((uint8_t *) cvct) + pos);
}
static inline struct atsc_cvct_channel *
atsc_cvct_section_channels_next(struct atsc_cvct_section *cvct,
struct atsc_cvct_channel *pos,
int idx)
{
if (idx >= cvct->num_channels_in_section)
return NULL;
return (struct atsc_cvct_channel *)
(((uint8_t*) pos) + sizeof(struct atsc_cvct_channel) + pos->descriptors_length);
}
static inline struct descriptor *
atsc_cvct_channel_descriptors_first(struct atsc_cvct_channel *table)
{
size_t pos = sizeof(struct atsc_cvct_channel);
if (table->descriptors_length == 0)
return NULL;
return (struct descriptor*) (((uint8_t *) table) + pos);
}
static inline struct descriptor *
atsc_cvct_channel_descriptors_next(struct atsc_cvct_channel *table,
struct descriptor *pos)
{
return next_descriptor((uint8_t*) table + sizeof(struct atsc_cvct_channel),
table->descriptors_length,
pos);
}
static inline struct descriptor *
atsc_cvct_section_part2_descriptors_first(struct atsc_cvct_section_part2 *part2)
{
size_t pos = sizeof(struct atsc_cvct_section_part2);
if (part2->descriptors_length == 0)
return NULL;
return (struct descriptor*) (((uint8_t *) part2) + pos);
}
static inline struct descriptor *
atsc_cvct_section_part2_descriptors_next(struct atsc_cvct_section_part2 *part2,
struct descriptor *pos)
{
return next_descriptor((uint8_t*) part2 + sizeof(struct atsc_cvct_section_part2),
part2->descriptors_length,
pos);
}
#ifdef __cplusplus
}
#endif
#endif
