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Bitstream by VideoLAN
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bitstream/dvb/si/desc_45.h

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/*****************************************************************************
* desc_45.h: ETSI EN 300 458 Descriptor 0x45: VBI data descriptor
*****************************************************************************
* Copyright (C) 2011 Unix Solutions Ltd.
*
* Authors: Georgi Chorbadzhiyski <georgi@unixsol.org>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject
* to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*****************************************************************************/
/*
* Normative references:
* - ETSI EN 300 458 V1.11.1 (2010-04) (SI in DVB systems)
*/
#ifndef __BITSTREAM_DVB_DESC_45_H__
#define __BITSTREAM_DVB_DESC_45_H__
#include <bitstream/common.h>
#include <bitstream/mpeg/psi/descriptors.h>
#ifdef __cplusplus
extern "C"
{
#endif
/*****************************************************************************
* Descriptor 0x45: VBI data descriptor
*****************************************************************************/
#define DESC45_HEADER_SIZE DESC_HEADER_SIZE
#define DESC45_DATA_SIZE 2
static inline void desc45_init(uint8_t *p_desc)
{
desc_set_tag(p_desc, 0x45);
}
static inline void desc45n_set_service_id(uint8_t *p_desc_n, uint8_t i_service_id)
{
p_desc_n[0] = i_service_id;
}
static inline uint8_t desc45n_get_service_id(const uint8_t *p_desc_n)
{
return p_desc_n[0];
}
static inline void desc45n_set_data_length(uint8_t *p_desc_n, uint8_t i_length)
{
p_desc_n[1] = i_length;
}
static inline uint8_t desc45n_get_data_length(const uint8_t *p_desc_n)
{
return p_desc_n[1];
}
static inline const char *desc45_get_service_id_txt(uint8_t i_service_id)
{
return i_service_id == 0x00 ? "reserved" :
i_service_id == 0x01 ? "EBU teletext" :
i_service_id == 0x02 ? "inverted teletext" :
i_service_id == 0x03 ? "reserved" :
i_service_id == 0x04 ? "VPS" :
i_service_id == 0x05 ? "WSS" :
i_service_id == 0x06 ? "Closed Captioning" :
i_service_id == 0x07 ? "Mono 4:2:2 samples" : "reserved";
}
static inline uint8_t desc45n_get_byte(uint8_t *p_desc_n, uint8_t idx)
{
return p_desc_n[idx + 2];
}
static inline void desc45n_set_byte(uint8_t *p_desc_n, uint8_t idx, uint8_t i_byte)
{
p_desc_n[idx + 2] = i_byte;
}
static inline bool desc45n_get_field_parity(const uint8_t *p_desc_n, uint8_t idx)
{
return (p_desc_n[idx + 2] & 0x20) == 0x20;
}
static inline void desc45n_set_field_parity(uint8_t *p_desc_n, uint8_t idx, bool b_parity)
{
p_desc_n[idx + 2] = 0xc0 | (b_parity ? (p_desc_n[idx + 2] | 0x20) : (p_desc_n[idx + 2] &~ 0x20));
}
static inline uint8_t desc45n_get_line_offset(const uint8_t *p_desc_n, uint8_t idx)
{
return p_desc_n[idx + 2] & 0x1f;
}
static inline void desc45n_set_line_offset(uint8_t *p_desc_n, uint8_t idx, uint8_t i_line_offset)
{
p_desc_n[idx + 2] = 0xc0 | (p_desc_n[idx + 2] & 0x20) | (i_line_offset & 0x1f);
}
static inline uint8_t *desc45_get_data(uint8_t *p_desc, uint8_t n)
{
uint8_t *p_desc_n = p_desc + DESC45_HEADER_SIZE;
uint8_t i_desc_size = desc_get_length(p_desc);
while (n) {
if (p_desc_n + DESC45_DATA_SIZE - p_desc > i_desc_size)
return NULL;
p_desc_n += DESC45_DATA_SIZE + desc45n_get_data_length(p_desc_n);
n--;
}
if (p_desc_n - p_desc > i_desc_size)
return NULL;
return p_desc_n;
}
static inline bool desc45_validate(const uint8_t *p_desc)
{
const uint8_t *p_desc_n = p_desc + DESC45_HEADER_SIZE;
int i_desc_size = desc_get_length(p_desc);
while (i_desc_size > 0)
{
uint8_t i_data_sz = DESC45_DATA_SIZE + desc45n_get_data_length(p_desc_n);
i_desc_size -= i_data_sz;
p_desc_n += i_data_sz;
}
return i_desc_size == 0;
}
static inline void desc45_print(uint8_t *p_desc, f_print pf_print,
void *opaque, print_type_t i_print_type)
{
uint8_t j = 0;
uint8_t *p_desc_n;
if (i_print_type == PRINT_XML)
pf_print(opaque, "<VBI_DATA_DESC>");
while ((p_desc_n = desc45_get_data(p_desc, j++)) != NULL) {
uint8_t k;
uint8_t i_service_id = desc45n_get_service_id(p_desc_n);
uint8_t i_service_len = desc45n_get_data_length(p_desc_n);
switch (i_print_type) {
case PRINT_XML:
pf_print(opaque,
"<VBI_DATA_SERVICE service_id=\"0x%02x\" length=\"%u\" service_txt=\"%s\">",
i_service_id, i_service_len, desc45_get_service_id_txt(i_service_id)
);
for (k = 0; k < i_service_len; k++) {
if (i_service_id >= 1 && i_service_id <= 7 && i_service_id != 3)
{
pf_print(opaque,
"<VBI_DATA field_parity=\"%u\" line_offset=\"%u\"/>",
desc45n_get_field_parity(p_desc_n, k),
desc45n_get_line_offset(p_desc_n, k));
} else {
pf_print(opaque,
"<VBI_DATA reserved_byte=\"0x%02x\"/>",
desc45n_get_byte(p_desc_n, k));
}
}
pf_print(opaque, "</VBI_DATA_SERVICE>");
break;
default:
pf_print(opaque,
" - desc 45 vbi_data service_id=0x%02x length=%u service_txt=\"%s\"",
i_service_id, i_service_len, desc45_get_service_id_txt(i_service_id));
for (k = 0; k < i_service_len; k++) {
if (i_service_id >= 1 && i_service_id <= 7 && i_service_id != 3)
{
pf_print(opaque,
" - vbi_data field_parity=%u line_offset=%u",
desc45n_get_field_parity(p_desc_n, k),
desc45n_get_line_offset(p_desc_n, k));
} else {
pf_print(opaque,
" - vbi_data reserved_byte=0x%02x",
desc45n_get_byte(p_desc_n, k));
}
}
}
}
if (i_print_type == PRINT_XML)
pf_print(opaque, "</VBI_DATA_DESC>");
}
#ifdef __cplusplus
}
#endif
#endif