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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_ANNOUNCEMENT_SUPPORT_DESCRIPTOR
#define _UCSI_DVB_ANNOUNCEMENT_SUPPORT_DESCRIPTOR 1
#ifdef __cplusplus
extern "C"
{
#endif
#include <libucsi/descriptor.h>
#include <libucsi/endianops.h>
/**
* Possible values for announcement_support_indicator.
*/
enum {
DVB_ANNOUNCEMENT_SUPPORT_EMERGENCY = 0x01,
DVB_ANNOUNCEMENT_SUPPORT_ROAD_TRAFFIC_FLASH = 0x02,
DVB_ANNOUNCEMENT_SUPPORT_PUBLIC_TRANSPORT_FLASH = 0x04,
DVB_ANNOUNCEMENT_SUPPORT_WARNING_MESSAGE = 0x08,
DVB_ANNOUNCEMENT_SUPPORT_NEWS_FLASH = 0x10,
DVB_ANNOUNCEMENT_SUPPORT_WEATHER_FLASH = 0x20,
DVB_ANNOUNCEMENT_SUPPORT_EVENT_ANNOUNCEMENT = 0x40,
DVB_ANNOUNCEMENT_SUPPORT_PERSONAL_CALL = 0x80
};
/**
* Possible values for announcement_type.
*/
enum {
DVB_ANNOUNCEMENT_TYPE_EMERGENCY = 0x00,
DVB_ANNOUNCEMENT_TYPE_ROAD_TRAFFIC_FLASH = 0x01,
DVB_ANNOUNCEMENT_TYPE_PUBLIC_TRANSPORT_FLASH = 0x02,
DVB_ANNOUNCEMENT_TYPE_WARNING_MESSAGE = 0x03,
DVB_ANNOUNCEMENT_TYPE_NEWS_FLASH = 0x04,
DVB_ANNOUNCEMENT_TYPE_WEATHER_FLASH = 0x05,
DVB_ANNOUNCEMENT_TYPE_EVENT_ANNOUNCEMENT = 0x06,
DVB_ANNOUNCEMENT_TYPE_PERSONAL_CALL = 0x07
};
/**
* Possible values for reference_type.
*/
enum {
DVB_REFERENCE_TYPE_AUDIO = 0x00,
DVB_REFERENCE_TYPE_OTHER_AUDIO = 0x01,
DVB_REFERENCE_TYPE_OTHER_SERVICE = 0x02,
DVB_REFERENCE_TYPE_OTHER_TS = 0x03
};
/**
* dvb_announcement_support_descriptor structure.
*/
struct dvb_announcement_support_descriptor {
struct descriptor d;
uint16_t announcement_support_indicator;
/* struct dvb_announcement_support_entry entries[] */
} __ucsi_packed;
/**
* An entry in the entries field of a dvb_announcement_support_descriptor.
*/
struct dvb_announcement_support_entry {
EBIT3(uint8_t announcement_type : 4; ,
uint8_t reserved : 1; ,
uint8_t reference_type : 3; )
/* Only if reference_type == 1, 2 or 3:
* struct dvb_announcement_support_reference reference */
} __ucsi_packed;
/**
* The optional reference field only present in a dvb_announcement_support_descriptor if
* its reference_type field is 1,2 or 3.
*/
struct dvb_announcement_support_reference {
uint16_t original_network_id;
uint16_t transport_stream_id;
uint16_t service_id;
uint8_t component_tag;
} __ucsi_packed;
/**
* Process a dvb_announcement_support_descriptor.
*
* @param d Generic descriptor pointer.
* @return dvb_announcement_support_descriptor pointer, or NULL on error.
*/
static inline struct dvb_announcement_support_descriptor*
dvb_announcement_support_descriptor_codec(struct descriptor* d)
{
uint32_t pos = 0;
uint8_t* buf = (uint8_t*) d + 2;
uint32_t len = d->len;
if (len < (sizeof(struct dvb_announcement_support_descriptor) - 2))
return NULL;
bswap16(buf+pos);
pos += 2;
while(pos < len) {
struct dvb_announcement_support_entry *e =
(struct dvb_announcement_support_entry*) (buf+pos);
pos += sizeof(struct dvb_announcement_support_entry);
if (pos > len)
return NULL;
if ((e->reference_type == 1) ||
(e->reference_type == 2) ||
(e->reference_type == 3)) {
if ((pos + sizeof(struct dvb_announcement_support_reference)) > len)
return NULL;
bswap16(buf+pos);
bswap16(buf+pos+2);
bswap16(buf+pos+4);
pos += sizeof(struct dvb_announcement_support_reference);
}
}
return (struct dvb_announcement_support_descriptor*) d;
}
/**
* Iterator for the entries field of a dvb_announcement_support_descriptor.
*
* @param d dvb_announcement_support_descriptor pointer.
* @param pod Variable holding a pointer to the current dvb_announcement_support_entry.
*/
#define dvb_announcement_support_descriptor_entries_for_each(d, pos) \
for ((pos) = dvb_announcement_support_descriptor_entries_first(d); \
(pos); \
(pos) = dvb_announcement_support_descriptor_entries_next(d, pos))
/**
* Accessor for the reference field of a dvb_announcement_support_entry if present.
*
* @param entry dvb_announcement_support_entry pointer.
* @return dvb_announcement_support_reference pointer, or NULL on error.
*/
static inline struct dvb_announcement_support_reference*
dvb_announcement_support_entry_reference(struct dvb_announcement_support_entry* entry)
{
if ((entry->reference_type != 0x01) &&
(entry->reference_type != 0x02) &&
(entry->reference_type != 0x03))
return NULL;
return (struct dvb_announcement_support_reference*)
((uint8_t*) entry + sizeof(struct dvb_announcement_support_entry));
}
/******************************** PRIVATE CODE ********************************/
static inline struct dvb_announcement_support_entry*
dvb_announcement_support_descriptor_entries_first(struct dvb_announcement_support_descriptor *d)
{
if (d->d.len == 2)
return NULL;
return (struct dvb_announcement_support_entry *)
((uint8_t*) d + sizeof(struct dvb_announcement_support_descriptor));
}
static inline struct dvb_announcement_support_entry*
dvb_announcement_support_descriptor_entries_next(struct dvb_announcement_support_descriptor *d,
struct dvb_announcement_support_entry *pos)
{
uint8_t *end = (uint8_t*) d + 2 + d->d.len;
uint8_t* next = (uint8_t*) pos + sizeof(struct dvb_announcement_support_entry);
struct dvb_announcement_support_reference* reference =
dvb_announcement_support_entry_reference(pos);
if (reference)
next += sizeof(struct dvb_announcement_support_reference);
if (next >= end)
return NULL;
return (struct dvb_announcement_support_entry *) next;
}
#ifdef __cplusplus
}
#endif
#endif
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