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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_AIT_APPLICATION_DESCRIPTOR
#define _UCSI_DVB_AIT_APPLICATION_DESCRIPTOR 1
#ifdef __cplusplus
extern "C"
{
#endif
#include <libucsi/descriptor.h>
#include <libucsi/endianops.h>
/**
* Possible values for the visibility field.
*/
enum {
AVB_AIT_APPLICATION_VISIBILITY_HIDDEN = 0x00,
AVB_AIT_APPLICATION_VISIBILITY_APPSONLY = 0x01,
AVB_AIT_APPLICATION_VISIBILITY_VISIBLE = 0x03,
};
/**
* dvb_ait_application_descriptor structure.
*/
struct dvb_ait_application_descriptor {
struct descriptor d;
uint8_t application_profiles_length;
/* struct dvb_ait_application_profile profiles [] */
/* struct dvb_ait_application_descriptor_part2 part2 */
} __ucsi_packed;
/**
* An entry in the profiles field of a dvb_ait_application_descriptor.
*/
struct dvb_ait_application_profile {
uint16_t application_profile;
uint8_t version_major;
uint8_t version_minor;
uint8_t version_micro;
} __ucsi_packed;
/**
* Second part of a dvb_ait_application_descriptor structure.
*/
struct dvb_ait_application_descriptor_part2 {
EBIT3(uint8_t service_bound_flag : 1; ,
uint8_t visibility : 2; ,
uint8_t reserved : 5; );
uint8_t application_priority;
/* uint8_t transport_protocol_label[] */
} __ucsi_packed;
/**
* Process a dvb_ait_application_descriptor.
*
* @param d Generic descriptor pointer.
* @return dvb_ait_application_descriptor pointer, or NULL on error.
*/
static inline struct dvb_ait_application_descriptor*
dvb_ait_application_descriptor_codec(struct descriptor* d)
{
uint32_t pos = 0;
uint32_t pos2 = 0;
uint32_t len = d->len + 2;
uint8_t* buf = (uint8_t*) d;
struct dvb_ait_application_descriptor *ret =
(struct dvb_ait_application_descriptor*) d;
if (len < sizeof(struct dvb_ait_application_descriptor))
return NULL;
if (len < (sizeof(struct dvb_ait_application_descriptor) + ret->application_profiles_length))
return NULL;
if (ret->application_profiles_length % sizeof(struct dvb_ait_application_profile))
return NULL;
pos += sizeof(struct dvb_ait_application_descriptor);
pos2 = 0;
while(pos2 < ret->application_profiles_length) {
bswap16(buf + pos + pos2);
pos2 += sizeof(struct dvb_ait_application_descriptor);
}
pos += pos2;
if (len < (pos + sizeof(struct dvb_ait_application_descriptor_part2)))
return NULL;
return ret;
}
/**
* Iterator for the profiles field of a dvb_ait_application_descriptor.
*
* @param d dvb_ait_application_descriptor pointer.
* @param pos Variable containing a pointer to the current dvb_ait_application_profile.
*/
#define dvb_ait_application_descriptor_profiles_for_each(d, pos) \
for ((pos) = dvb_ait_application_descriptor_profiles_first(d); \
(pos); \
(pos) = dvb_ait_application_descriptor_profiles_next(d, pos))
/**
* Accessor for the part2 field of a dvb_ait_application_descriptor.
*
* @param d dvb_ait_application_descriptor pointer.
* @return dvb_ait_application_descriptor_part2 pointer.
*/
static inline struct dvb_ait_application_descriptor_part2*
dvb_ait_application_descriptor_part2(struct dvb_ait_application_descriptor* d)
{
return (struct dvb_ait_application_descriptor_part2*)
((uint8_t*) d +
sizeof(struct dvb_ait_application_descriptor) +
d->application_profiles_length);
}
/**
* Accessor for the transport_protocol_label field of a dvb_ait_application_descriptor_part2.
*
* @param d dvb_ait_application_descriptor_part2 pointer.
* @return Pointer to the field.
*/
static inline uint8_t*
dvb_ait_application_descriptor_part2_transport_protocol_label(struct dvb_ait_application_descriptor_part2* d)
{
return (uint8_t*) d +
sizeof(struct dvb_ait_application_descriptor_part2);
}
/**
* Calculate the number of bytes in the transport_protocol_label field of a dvb_ait_application_descriptor_part2.
*
* @param d dvb_ait_application_descriptor pointer.
* @param part2 dvb_ait_application_descriptor_part2 pointer.
* @return Number of bytes.
*/
static inline int
dvb_ait_application_descriptor_part2_transport_protocol_label_length(struct dvb_ait_application_descriptor *d,
struct dvb_ait_application_descriptor_part2* part2)
{
uint8_t *ptr = (uint8_t*) part2 + sizeof(struct dvb_ait_application_descriptor_part2);
uint8_t *end = (uint8_t*) d + d->d.len + 2;
return (int) (end - ptr);
}
/******************************** PRIVATE CODE ********************************/
static inline struct dvb_ait_application_profile*
dvb_ait_application_descriptor_profiles_first(struct dvb_ait_application_descriptor *d)
{
if (d->application_profiles_length == 0)
return NULL;
return (struct dvb_ait_application_profile *)
((uint8_t*) d + sizeof(struct dvb_ait_application_descriptor));
}
static inline struct dvb_ait_application_profile*
dvb_ait_application_descriptor_profiles_next(struct dvb_ait_application_descriptor *d,
struct dvb_ait_application_profile *pos)
{
uint8_t *end = (uint8_t*) d +
sizeof(struct dvb_ait_application_descriptor) +
d->application_profiles_length;
uint8_t *next = (uint8_t *) pos + sizeof(struct dvb_ait_application_profile);
if (next >= end)
return NULL;
return (struct dvb_ait_application_profile *) next;
}
#ifdef __cplusplus
}
#endif
#endif
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