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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_TELETEXT_DESCRIPTOR
#define _UCSI_DVB_TELETEXT_DESCRIPTOR 1
#ifdef __cplusplus
extern "C"
{
#endif
#include <libucsi/descriptor.h>
#include <libucsi/endianops.h>
#include <libucsi/types.h>
/**
* Possible values for the type field.
*/
enum {
DVB_TELETEXT_TYPE_INITIAL = 0x01,
DVB_TELETEXT_TYPE_SUBTITLE = 0x02,
DVB_TELETEXT_TYPE_ADDITIONAL = 0x03,
DVB_TELETEXT_TYPE_SCHEDULE = 0x04,
DVB_TELETEXT_TYPE_SUBTITLE_HEARING_IMPAIRED= 0x05,
};
/**
* dvb_teletext_descriptor structure.
*/
struct dvb_teletext_descriptor {
struct descriptor d;
/* struct dvb_teletext_entry entries[] */
} __ucsi_packed;
/**
* An entry in the entries field of a dvb_teletext_descriptor.
*/
struct dvb_teletext_entry {
iso639lang_t language_code;
EBIT2(uint8_t type : 5; ,
uint8_t magazine_number: 3; );
uint8_t page_number;
} __ucsi_packed;
/**
* Process a dvb_teletext_descriptor.
*
* @param d Generic descriptor.
* @return dvb_teletext_descriptor pointer, or NULL on error.
*/
static inline struct dvb_teletext_descriptor*
dvb_teletext_descriptor_codec(struct descriptor* d)
{
if (d->len % sizeof(struct dvb_teletext_entry))
return NULL;
return (struct dvb_teletext_descriptor*) d;
}
/**
* Iterator for entries field of a dvb_teletext_descriptor.
*
* @param d dvb_teletext_descriptor pointer.
* @param pos Variable holding a pointer to the current dvb_teletext_entry.
*/
#define dvb_teletext_descriptor_entries_for_each(d, pos) \
for ((pos) = dvb_teletext_descriptor_entries_first(d); \
(pos); \
(pos) = dvb_teletext_descriptor_entries_next(d, pos))
/******************************** PRIVATE CODE ********************************/
static inline struct dvb_teletext_entry*
dvb_teletext_descriptor_entries_first(struct dvb_teletext_descriptor *d)
{
if (d->d.len == 0)
return NULL;
return (struct dvb_teletext_entry *)
((uint8_t*) d + sizeof(struct dvb_teletext_descriptor));
}
static inline struct dvb_teletext_entry*
dvb_teletext_descriptor_entries_next(struct dvb_teletext_descriptor *d,
struct dvb_teletext_entry *pos)
{
uint8_t *end = (uint8_t*) d + 2 + d->d.len;
uint8_t *next = (uint8_t *) pos + sizeof(struct dvb_teletext_entry);
if (next >= end)
return NULL;
return (struct dvb_teletext_entry *) next;
}
#ifdef __cplusplus
}
#endif
#endif
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