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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_SERVICE_LOCATION_DESCRIPTOR
#define _UCSI_ATSC_SERVICE_LOCATION_DESCRIPTOR 1
#ifdef __cplusplus
extern "C"
{
#endif
#include <libucsi/descriptor.h>
#include <libucsi/endianops.h>
#include <libucsi/types.h>
enum atsc_stream_types {
ATSC_STREAM_TYPE_VIDEO = 0x02,
ATSC_STREAM_TYPE_AUDIO = 0x81,
};
/**
* atsc_service_location_descriptor structure.
*/
struct atsc_service_location_descriptor {
struct descriptor d;
EBIT2(uint16_t reserved : 3; ,
uint16_t PCR_PID :13; );
uint8_t number_elements;
/* struct atsc_service_location_element elements[] */
} __ucsi_packed;
/**
* An entry in the elements field of an atsc_service_location_descriptor.
*/
struct atsc_caption_service_location_element {
uint8_t stream_type;
EBIT2(uint16_t reserved : 3; ,
uint16_t elementary_PID :13; );
iso639lang_t language_code;
} __ucsi_packed;
/**
* Process an atsc_service_location_descriptor.
*
* @param d Generic descriptor pointer.
* @return atsc_service_location_descriptor pointer, or NULL on error.
*/
static inline struct atsc_service_location_descriptor*
atsc_service_location_descriptor_codec(struct descriptor* d)
{
struct atsc_service_location_descriptor *ret =
(struct atsc_service_location_descriptor *) d;
uint8_t *buf = (uint8_t*) d + 2;
int pos = 0;
int idx;
if (d->len < 3)
return NULL;
bswap16(buf + pos);
pos+=3;
for(idx = 0; idx < ret->number_elements; idx++) {
if (d->len < (pos + sizeof(struct atsc_caption_service_entry)))
return NULL;
bswap16(buf+pos+1);
pos += sizeof(struct atsc_caption_service_entry);
}
return (struct atsc_service_location_descriptor*) d;
}
/**
* Iterator for elements field of a atsc_service_location_descriptor.
*
* @param d atsc_service_location_descriptor pointer.
* @param pos Variable holding a pointer to the current atsc_service_location_element.
* @param idx Integer used to count which dimension we are in.
*/
#define atsc_service_location_descriptor_elements_for_each(d, pos, idx) \
for ((pos) = atsc_service_location_descriptor_elements_first(d), idx=0; \
(pos); \
(pos) = atsc_service_location_descriptor_elements_next(d, pos, ++idx))
/******************************** PRIVATE CODE ********************************/
static inline struct atsc_caption_service_location_element*
atsc_service_location_descriptor_elements_first(struct atsc_service_location_descriptor *d)
{
if (d->number_elements == 0)
return NULL;
return (struct atsc_caption_service_location_element *)
((uint8_t*) d + sizeof(struct atsc_service_location_descriptor));
}
static inline struct atsc_caption_service_location_element*
atsc_service_location_descriptor_elements_next(struct atsc_service_location_descriptor *d,
struct atsc_caption_service_location_element *pos,
int idx)
{
uint8_t *next = (uint8_t *) pos + sizeof(struct atsc_caption_service_location_element);
if (idx >= d->number_elements)
return NULL;
return (struct atsc_caption_service_location_element *) next;
}
#ifdef __cplusplus
}
#endif
#endif
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