You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
325 lines
8.3 KiB
325 lines
8.3 KiB
/*
|
|
* 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_MOSAIC_DESCRIPTOR
|
|
#define _UCSI_DVB_MOSAIC_DESCRIPTOR 1
|
|
|
|
#ifdef __cplusplus
|
|
extern "C"
|
|
{
|
|
#endif
|
|
|
|
#include <libucsi/descriptor.h>
|
|
#include <libucsi/endianops.h>
|
|
|
|
/**
|
|
* dvb_mosaic_descriptor structure.
|
|
*/
|
|
struct dvb_mosaic_descriptor {
|
|
struct descriptor d;
|
|
|
|
EBIT4(uint8_t mosaic_entry_point : 1; ,
|
|
uint8_t number_of_horiz_elementary_cells: 3; ,
|
|
uint8_t reserved : 1; ,
|
|
uint8_t number_of_vert_elementary_cells : 3; );
|
|
/* struct dvb_mosaic_info infos[] */
|
|
} __ucsi_packed;
|
|
|
|
/**
|
|
* An entry in the infos field of a dvb_mosaic_descriptor.
|
|
*/
|
|
struct dvb_mosaic_info {
|
|
EBIT3(uint16_t logical_cell_id : 6; ,
|
|
uint16_t reserved : 7; ,
|
|
uint16_t logical_cell_presentation_info : 3; );
|
|
uint8_t elementary_cell_field_length;
|
|
/* struct dvb_mosaic_elementary_cell_field fields[] */
|
|
/* struct dvb_mosaic_info_part2 part2 */
|
|
/* struct dvb_mosaic_linkage linkage */
|
|
} __ucsi_packed;
|
|
|
|
/**
|
|
* An entry in the fields field of a dvb_mosaic_info.
|
|
*/
|
|
struct dvb_mosaic_elementary_cell_field {
|
|
EBIT2(uint8_t reserved : 2; ,
|
|
uint8_t elementary_cell_id : 6; );
|
|
} __ucsi_packed;
|
|
|
|
/**
|
|
* Part2 of dvb_mosaic_info, following the variable length fields field.
|
|
*/
|
|
struct dvb_mosaic_info_part2 {
|
|
uint8_t cell_linkage_info;
|
|
} __ucsi_packed;
|
|
|
|
struct dvb_mosaic_linkage_01 {
|
|
uint16_t bouquet_id;
|
|
} __ucsi_packed;
|
|
|
|
struct dvb_mosaic_linkage_02 {
|
|
uint16_t original_network_id;
|
|
uint16_t transport_stream_id;
|
|
uint16_t service_id;
|
|
} __ucsi_packed;
|
|
|
|
struct dvb_mosaic_linkage_03 {
|
|
uint16_t original_network_id;
|
|
uint16_t transport_stream_id;
|
|
uint16_t service_id;
|
|
} __ucsi_packed;
|
|
|
|
struct dvb_mosaic_linkage_04 {
|
|
uint16_t original_network_id;
|
|
uint16_t transport_stream_id;
|
|
uint16_t service_id;
|
|
uint16_t event_id;
|
|
} __ucsi_packed;
|
|
|
|
/**
|
|
* Structure describing the linkage field of a dvb_mosaic_info
|
|
*/
|
|
struct dvb_mosaic_linkage {
|
|
union {
|
|
struct dvb_mosaic_linkage_01 linkage_01;
|
|
struct dvb_mosaic_linkage_02 linkage_02;
|
|
struct dvb_mosaic_linkage_03 linkage_03;
|
|
struct dvb_mosaic_linkage_04 linkage_04;
|
|
} u;
|
|
} __ucsi_packed;
|
|
|
|
/**
|
|
* Process a dvb_mosaic_descriptor.
|
|
*
|
|
* @param d Pointer to a generic descriptor structure.
|
|
*/
|
|
static inline struct dvb_mosaic_descriptor*
|
|
dvb_mosaic_descriptor_codec(struct descriptor* d)
|
|
{
|
|
uint8_t* buf = (uint8_t*) d + 2;
|
|
uint32_t pos = 0;
|
|
uint32_t len = d->len;
|
|
struct dvb_mosaic_descriptor * p =
|
|
(struct dvb_mosaic_descriptor *) d;
|
|
|
|
pos += (sizeof(struct dvb_mosaic_descriptor) - 2);
|
|
|
|
if (pos > len)
|
|
return NULL;
|
|
|
|
while(pos < len) {
|
|
struct dvb_mosaic_info *e =
|
|
(struct dvb_mosaic_info*) (buf+pos);
|
|
struct dvb_mosaic_info_part2 *e2;
|
|
struct dvb_mosaic_linkage *linkage;
|
|
|
|
if ((pos + sizeof(struct dvb_mosaic_info)) > len)
|
|
return NULL;
|
|
|
|
bswap16(buf + pos);
|
|
|
|
pos += sizeof(struct dvb_mosaic_info) +
|
|
e->elementary_cell_field_length;
|
|
|
|
if (pos > len)
|
|
return NULL;
|
|
|
|
e2 = (struct dvb_mosaic_info_part2*) (buf+pos);
|
|
|
|
pos += sizeof(struct dvb_mosaic_info_part2);
|
|
|
|
if (pos > len)
|
|
return NULL;
|
|
|
|
linkage = (struct dvb_mosaic_linkage*) (buf+pos);
|
|
|
|
switch(e2->cell_linkage_info) {
|
|
case 0x01:
|
|
if ((pos + sizeof(struct dvb_mosaic_linkage_01)) > len)
|
|
return NULL;
|
|
bswap16(buf+pos);
|
|
pos += sizeof(struct dvb_mosaic_linkage_01);
|
|
break;
|
|
|
|
case 0x02:
|
|
if ((pos + sizeof(struct dvb_mosaic_linkage_02)) > len)
|
|
return NULL;
|
|
bswap16(buf+pos);
|
|
bswap16(buf+pos+2);
|
|
bswap16(buf+pos+4);
|
|
pos += sizeof(struct dvb_mosaic_linkage_02);
|
|
break;
|
|
|
|
case 0x03:
|
|
if ((pos + sizeof(struct dvb_mosaic_linkage_03)) > len)
|
|
return NULL;
|
|
bswap16(buf+pos);
|
|
bswap16(buf+pos+2);
|
|
bswap16(buf+pos+4);
|
|
pos += sizeof(struct dvb_mosaic_linkage_03);
|
|
break;
|
|
|
|
case 0x04:
|
|
if ((pos + sizeof(struct dvb_mosaic_linkage_04)) > len)
|
|
return NULL;
|
|
bswap16(buf+pos);
|
|
bswap16(buf+pos+2);
|
|
bswap16(buf+pos+4);
|
|
bswap16(buf+pos+6);
|
|
pos += sizeof(struct dvb_mosaic_linkage_04);
|
|
break;
|
|
}
|
|
}
|
|
|
|
return p;
|
|
}
|
|
|
|
/**
|
|
* Iterator over the infos field of a dvb_mosaic_descriptor.
|
|
*
|
|
* @param d dvb_mosaic_descriptor pointer.
|
|
* @param pos Variable containing a pointer to the current dvb_mosaic_info.
|
|
*/
|
|
#define dvb_mosaic_descriptor_infos_for_each(d, pos) \
|
|
for ((pos) = dvb_mosaic_descriptor_infos_first(d); \
|
|
(pos); \
|
|
(pos) = dvb_mosaic_descriptor_infos_next(d, pos))
|
|
|
|
/**
|
|
* Iterator over the fields field of a dvb_mosaic_info.
|
|
*
|
|
* @param info dvb_mosaic_info pointer.
|
|
* @param pos Variable containing a pointer to the current dvb_mosaic_elementary_cell_field.
|
|
*/
|
|
#define dvb_mosaic_info_fields_for_each(info, pos) \
|
|
for ((pos) = dvb_mosaic_info_fields_first(info); \
|
|
(pos); \
|
|
(pos) = dvb_mosaic_info_fields_next(info, pos))
|
|
|
|
/**
|
|
* Accessor for the second part of the dvb_mosaic_info structure.
|
|
*
|
|
* @param entry dvb_mosaic_info pointer.
|
|
* @return dvb_mosaic_info_part2 pointer.
|
|
*/
|
|
static inline struct dvb_mosaic_info_part2*
|
|
dvb_mosaic_info_part2(struct dvb_mosaic_info* entry)
|
|
{
|
|
return (struct dvb_mosaic_info_part2*)
|
|
((uint8_t*) entry + sizeof(struct dvb_mosaic_info) +
|
|
entry->elementary_cell_field_length);
|
|
}
|
|
|
|
/**
|
|
* Accessor for the linkage field a dvb_mosaic_info structure.
|
|
*
|
|
* @param entry dvb_mosaic_info_part2 pointer.
|
|
* @return dvb_mosaic_linkage pointer, or NULL on error.
|
|
*/
|
|
static inline struct dvb_mosaic_linkage*
|
|
dvb_mosaic_linkage(struct dvb_mosaic_info_part2* entry)
|
|
{
|
|
if ((entry->cell_linkage_info != 0x01) &&
|
|
(entry->cell_linkage_info != 0x02) &&
|
|
(entry->cell_linkage_info != 0x03) &&
|
|
(entry->cell_linkage_info != 0x04))
|
|
return NULL;
|
|
|
|
return (struct dvb_mosaic_linkage*)
|
|
((uint8_t*) entry + sizeof(struct dvb_mosaic_info_part2));
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/******************************** PRIVATE CODE ********************************/
|
|
static inline struct dvb_mosaic_info*
|
|
dvb_mosaic_descriptor_infos_first(struct dvb_mosaic_descriptor *d)
|
|
{
|
|
if (d->d.len == 1)
|
|
return NULL;
|
|
|
|
return (struct dvb_mosaic_info *)
|
|
((uint8_t*) d + sizeof(struct dvb_mosaic_descriptor));
|
|
}
|
|
|
|
static inline struct dvb_mosaic_info*
|
|
dvb_mosaic_descriptor_infos_next(struct dvb_mosaic_descriptor *d,
|
|
struct dvb_mosaic_info *pos)
|
|
{
|
|
struct dvb_mosaic_info_part2* part2 = dvb_mosaic_info_part2(pos);
|
|
uint8_t *end = (uint8_t*) d + 2 + d->d.len;
|
|
uint8_t *next = (uint8_t *) pos + sizeof(struct dvb_mosaic_info) +
|
|
pos->elementary_cell_field_length +
|
|
sizeof(struct dvb_mosaic_info_part2);
|
|
|
|
if (part2->cell_linkage_info == 0x01)
|
|
next += sizeof(struct dvb_mosaic_linkage_01);
|
|
else if (part2->cell_linkage_info == 0x02)
|
|
next += sizeof(struct dvb_mosaic_linkage_02);
|
|
else if (part2->cell_linkage_info == 0x03)
|
|
next += sizeof(struct dvb_mosaic_linkage_03);
|
|
else if (part2->cell_linkage_info == 0x04)
|
|
next += sizeof(struct dvb_mosaic_linkage_04);
|
|
|
|
if (next >= end)
|
|
return NULL;
|
|
|
|
return (struct dvb_mosaic_info *) next;
|
|
}
|
|
|
|
static inline struct dvb_mosaic_elementary_cell_field*
|
|
dvb_mosaic_info_fields_first(struct dvb_mosaic_info *d)
|
|
{
|
|
if (d->elementary_cell_field_length == 0)
|
|
return NULL;
|
|
|
|
return (struct dvb_mosaic_elementary_cell_field*)
|
|
((uint8_t*) d + sizeof(struct dvb_mosaic_info));
|
|
}
|
|
|
|
static inline struct dvb_mosaic_elementary_cell_field*
|
|
dvb_mosaic_info_fields_next(struct dvb_mosaic_info *d,
|
|
struct dvb_mosaic_elementary_cell_field* pos)
|
|
{
|
|
uint8_t *end = (uint8_t*) d + sizeof(struct dvb_mosaic_info) +
|
|
d->elementary_cell_field_length;
|
|
uint8_t *next = (uint8_t *) pos +
|
|
sizeof(struct dvb_mosaic_elementary_cell_field);
|
|
|
|
if (next >= end)
|
|
return NULL;
|
|
|
|
return (struct dvb_mosaic_elementary_cell_field *) next;
|
|
}
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif
|