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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_CAPTION_SERVICE_DESCRIPTOR
#define _UCSI_ATSC_CAPTION_SERVICE_DESCRIPTOR 1
#ifdef __cplusplus
extern "C"
{
#endif
#include <libucsi/descriptor.h>
#include <libucsi/endianops.h>
#include <libucsi/types.h>
/**
* atsc_caption_service_descriptor structure.
*/
struct atsc_caption_service_descriptor {
struct descriptor d;
EBIT2(uint8_t reserved : 3; ,
uint8_t number_of_services : 5; );
/* struct atsc_caption_service_entry entries[] */
} __ucsi_packed;
/**
* An entry in the entries field of a atsc_caption_service_descriptor.
*/
struct atsc_caption_service_entry {
iso639lang_t language_code;
EBIT3(uint8_t digital_cc : 1; ,
uint8_t reserved : 1; ,
uint8_t value : 6; );
EBIT3(uint16_t easy_reader : 1; ,
uint16_t wide_aspect_ratio : 1; ,
uint16_t reserved1 :14; );
} __ucsi_packed;
/**
* Process an atsc_caption_service_descriptor.
*
* @param d Generic descriptor pointer.
* @return atsc_caption_service_descriptor pointer, or NULL on error.
*/
static inline struct atsc_caption_service_descriptor*
atsc_caption_service_descriptor_codec(struct descriptor* d)
{
struct atsc_caption_service_descriptor *ret =
(struct atsc_caption_service_descriptor *) d;
uint8_t *buf = (uint8_t*) d + 2;
int pos = 0;
int idx;
if (d->len < 1)
return NULL;
pos++;
for(idx = 0; idx < ret->number_of_services; idx++) {
if (d->len < (pos + sizeof(struct atsc_caption_service_entry)))
return NULL;
bswap16(buf+pos+4);
pos += sizeof(struct atsc_caption_service_entry);
}
return (struct atsc_caption_service_descriptor*) d;
}
/**
* Iterator for entries field of a atsc_caption_service_descriptor.
*
* @param d atsc_caption_service_descriptor pointer.
* @param pos Variable holding a pointer to the current atsc_caption_service_entry.
* @param idx Field iterator integer.
*/
#define atsc_caption_service_descriptor_entries_for_each(d, pos, idx) \
for ((pos) = atsc_caption_service_descriptor_entries_first(d), idx=0; \
(pos); \
(pos) = atsc_caption_service_descriptor_entries_next(d, pos, ++idx))
/******************************** PRIVATE CODE ********************************/
static inline struct atsc_caption_service_entry*
atsc_caption_service_descriptor_entries_first(struct atsc_caption_service_descriptor *d)
{
if (d->number_of_services == 0)
return NULL;
return (struct atsc_caption_service_entry *)
((uint8_t*) d + sizeof(struct atsc_caption_service_descriptor));
}
static inline struct atsc_caption_service_entry*
atsc_caption_service_descriptor_entries_next(struct atsc_caption_service_descriptor *d,
struct atsc_caption_service_entry *pos,
int idx)
{
if (idx >= d->number_of_services)
return NULL;
return (struct atsc_caption_service_entry *)
((uint8_t *) pos + sizeof(struct atsc_caption_service_entry));
}
#ifdef __cplusplus
}
#endif
#endif
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