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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_VBI_DATA_DESCRIPTOR
#define _UCSI_DVB_VBI_DATA_DESCRIPTOR 1
#ifdef __cplusplus
extern "C"
{
#endif
#include <libucsi/descriptor.h>
#include <libucsi/endianops.h>
/**
* Possible values for the data_service_id field.
*/
enum {
DVB_VBI_DATA_SERVICE_ID_EBU = 0x01,
DVB_VBI_DATA_SERVICE_ID_INVERTED = 0x02,
DVB_VBI_DATA_SERVICE_ID_VPS = 0x04,
DVB_VBI_DATA_SERVICE_ID_WSS = 0x05,
DVB_VBI_DATA_SERVICE_ID_CC = 0x06,
DVB_VBI_DATA_SERVICE_ID_MONO_422 = 0x07,
};
/**
* dvb_vbi_data_descriptor structure
*/
struct dvb_vbi_data_descriptor {
struct descriptor d;
/* struct dvb_vbi_data_entry entries[] */
} __ucsi_packed;
/**
* An entry in the dvb_vbi_data_descriptor entries field.
*/
struct dvb_vbi_data_entry {
uint8_t data_service_id;
uint8_t data_length;
/* uint8_t data[] */
} __ucsi_packed;
/**
* Format of the dvb_vbi_data_entry data field, if data_service_id == 1,2,4,5,6,7.
*/
struct dvb_vbi_data_x {
EBIT3(uint8_t reserved : 2; ,
uint8_t field_parity : 1; ,
uint8_t line_offset : 5; );
} __ucsi_packed;
/**
* Process a dvb_vbi_data_descriptor.
*
* @param d Generic descriptor structure.
* @return dvb_vbi_data_descriptor pointer, or NULL on error.
*/
static inline struct dvb_vbi_data_descriptor*
dvb_vbi_data_descriptor_codec(struct descriptor* d)
{
uint8_t* p = (uint8_t*) d + 2;
uint32_t pos = 0;
uint32_t len = d->len;
while(pos < len) {
struct dvb_vbi_data_entry *e =
(struct dvb_vbi_data_entry*) (p+pos);
pos += sizeof(struct dvb_vbi_data_entry);
if (pos > len)
return NULL;
pos += e->data_length;
if (pos > len)
return NULL;
}
return (struct dvb_vbi_data_descriptor*) d;
}
/**
* Iterator for entries field in a dvb_vbi_data_descriptor structure.
*
* @param d Pointer to dvb_vbi_data_descriptor structure.
* @param pos Variable holding pointer to the current dvb_vbi_data_entry structure.
*/
#define dvb_vbi_data_descriptor_entries_for_each(d, pos) \
for ((pos) = dvb_vbi_data_descriptor_entries_first(d); \
(pos); \
(pos) = dvb_vbi_data_descriptor_entries_next(d, pos))
/**
* Get a pointer to the data field of a dvb_vbi_data_entry.
*
* @param d dvb_vbi_data_entry structure.
* @return Pointer to the data field.
*/
static inline uint8_t *
dvb_vbi_data_entry_data(struct dvb_vbi_data_entry *d)
{
return (uint8_t *) d + sizeof(struct dvb_vbi_data_entry);
}
/**
* Get a pointer to the data field of a dvb_vbi_data_x for id 1,2,4,5,6,7.
*
* @param d dvb_vbi_data_entry structure.
* @return Pointer to the data field, or NULL if invalid
*/
static inline struct dvb_vbi_data_x*
dvb_vbi_data_entry_data_x(struct dvb_vbi_data_entry *d)
{
switch(d->data_service_id) {
case 1:
case 2:
case 4:
case 5:
case 6:
case 7:
return (struct dvb_vbi_data_x*) ((uint8_t *) d + sizeof(struct dvb_vbi_data_entry));
}
return NULL;
}
/******************************** PRIVATE CODE ********************************/
static inline struct dvb_vbi_data_entry*
dvb_vbi_data_descriptor_entries_first(struct dvb_vbi_data_descriptor *d)
{
if (d->d.len == 0)
return NULL;
return (struct dvb_vbi_data_entry *)
((uint8_t*) d + sizeof(struct dvb_vbi_data_descriptor));
}
static inline struct dvb_vbi_data_entry*
dvb_vbi_data_descriptor_entries_next(struct dvb_vbi_data_descriptor *d,
struct dvb_vbi_data_entry *pos)
{
uint8_t *end = (uint8_t*) d + 2 + d->d.len;
uint8_t *next = (uint8_t *) pos + sizeof(struct dvb_vbi_data_entry) +
pos->data_length;
if (next >= end)
return NULL;
return (struct dvb_vbi_data_entry *) next;
}
#ifdef __cplusplus
}
#endif
#endif
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