/usr/include/libucsi/mpeg/metadata_descriptor.h is in dvb-apps 1.1.1+rev1500-1.1+b1.
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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_MPEG_METADATA_DESCRIPTOR
#define _UCSI_MPEG_METADATA_DESCRIPTOR 1
#ifdef __cplusplus
extern "C"
{
#endif
#include <libucsi/descriptor.h>
#include <libucsi/endianops.h>
/**
* Values for the decoder_config_flags field.
*/
enum {
MPEG_DECODER_CONFIG_NONE = 0x00,
MPEG_DECODER_CONFIG_IN_DECODER_CONFIG = 0x01,
MPEG_DECODER_CONFIG_SAME_METADATA_SERVICE = 0x02,
MPEG_DECODER_CONFIG_DSMCC = 0x03,
MPEG_DECODER_CONFIG_SAME_PROGRAM = 0x04,
};
/**
* mpeg_metadata_descriptor structure.
*/
struct mpeg_metadata_descriptor {
struct descriptor d;
uint16_t metadata_application_format;
/* struct mpeg_metadata_descriptor_application_format_identifier appid */
/* uint8_t metadata_format */
/* struct mpeg_metadata_descriptor_format_identifier formid */
/* struct mpeg_metadata_descriptor_flags flags */
/* struct mpeg_metadata_descriptor_service_identifier service_identifier */
/* struct mpeg_metadata_descriptor_decoder_config decoder_config */
/* struct mpeg_metadata_descriptor_decoder_config_id_record decoder_config_id_record */
/* struct mpeg_metadata_descriptor_decoder_config_service_id decoder_config_service_id */
/* struct mpeg_metadata_descriptor_decoder_config_reserved decoder_config_reserved */
/* uint8_t private_data[] */
} __ucsi_packed;
/**
* appid field of a metadata_descriptor.
*/
struct mpeg_metadata_descriptor_application_format_identifier {
uint32_t id;
} __ucsi_packed;
/**
* formid field of a metadata_descriptor.
*/
struct mpeg_metadata_descriptor_format_identifier {
uint32_t id;
} __ucsi_packed;
/**
* Flags field of a metadata_descriptor
*/
struct mpeg_metadata_descriptor_flags {
uint8_t metadata_service_id;
EBIT3(uint8_t decoder_config_flags : 3; ,
uint8_t dsm_cc_flag : 1; ,
uint8_t reserved : 4; );
} __ucsi_packed;
/**
* service_identifier field of a metadata_descriptor.
*/
struct mpeg_metadata_descriptor_service_identifier {
uint8_t service_identification_length;
/* uint8_t data[] */
} __ucsi_packed;
/**
* decoder_config field of a metadata_descriptor.
*/
struct mpeg_metadata_descriptor_decoder_config {
uint8_t decoder_config_length;
/* uint8_t data[] */
} __ucsi_packed;
/**
* decoder_config_id_record field of a metadata_descriptor.
*/
struct mpeg_metadata_descriptor_decoder_config_id_record {
uint8_t decoder_config_id_record_length;
/* uint8_t data[] */
} __ucsi_packed;
/**
* decoder_config_service_id field of a metadata_descriptor.
*/
struct mpeg_metadata_descriptor_decoder_config_service_id {
uint8_t decoder_config_metadata_service_id;
} __ucsi_packed;
/**
* decoder_config_reserved field of a metadata_descriptor.
*/
struct mpeg_metadata_descriptor_decoder_config_reserved {
uint8_t reserved_data_length;
/* uint8_t data[] */
} __ucsi_packed;
/**
* Process an mpeg_metadata_descriptor.
*
* @param d Generic descriptor.
* @return Pointer to an mpeg_metadata_descriptor, or NULL on error.
*/
static inline struct mpeg_metadata_descriptor*
mpeg_metadata_descriptor_codec(struct descriptor* d)
{
uint32_t pos = 2;
uint8_t *buf = (uint8_t*) d;
uint32_t len = d->len + 2;
struct mpeg_metadata_descriptor_flags *flags;
int id;
if (len < sizeof(struct mpeg_metadata_descriptor))
return NULL;
bswap16(buf + pos);
id = *((uint16_t*) (buf+pos));
pos += 2;
if (id == 0xffff) {
if (len < (pos+4))
return NULL;
bswap32(buf+pos);
pos += 4;
}
if (len < (pos+1))
return NULL;
id = buf[pos];
pos++;
if (id == 0xff) {
if (len < (pos+4))
return NULL;
bswap32(buf+pos);
pos += 4;
}
if (len < (pos + sizeof(struct mpeg_metadata_descriptor_flags)))
return NULL;
flags = (struct mpeg_metadata_descriptor_flags*) (buf+pos);
pos += sizeof(struct mpeg_metadata_descriptor_flags);
if (flags->dsm_cc_flag == 1) {
if (len < (pos+1))
return NULL;
if (len < (pos+1+buf[pos]))
return NULL;
pos += 1 + buf[pos];
}
if (flags->decoder_config_flags == 1) {
if (len < (pos+1))
return NULL;
if (len < (pos+1+buf[pos]))
return NULL;
pos += 1 + buf[pos];
}
if (flags->decoder_config_flags == 3) {
if (len < (pos+1))
return NULL;
if (len < (pos+1+buf[pos]))
return NULL;
pos += 1 + buf[pos];
}
if (flags->decoder_config_flags == 4) {
if (len < (pos+1))
return NULL;
pos++;
}
if ((flags->decoder_config_flags == 5) ||
(flags->decoder_config_flags == 6)) {
if (len < (pos+1))
return NULL;
if (len < (pos+1+buf[pos]))
return NULL;
pos += 1 + buf[pos];
}
if (len < pos)
return NULL;
return (struct mpeg_metadata_descriptor*) d;
}
/**
* Accessor for pointer to appid field of an mpeg_metadata_descriptor.
*
* @param d The mpeg_metadata_descriptor structure.
* @return The pointer, or NULL on error.
*/
static inline struct mpeg_metadata_descriptor_application_format_identifier*
mpeg_metadata_descriptor_appid(struct mpeg_metadata_descriptor *d)
{
uint8_t *buf = (uint8_t*) d + sizeof(struct mpeg_metadata_descriptor);
if (d->metadata_application_format != 0xffff)
return NULL;
return (struct mpeg_metadata_descriptor_application_format_identifier*) buf;
}
/**
* Accessor for metadata_format field of an mpeg_metadata_descriptor.
*
* @param d The mpeg_metadata_descriptor structure.
* @return The pointer, or NULL on error.
*/
static inline uint8_t
mpeg_metadata_descriptor_metadata_format(struct mpeg_metadata_descriptor *d)
{
uint8_t *buf = (uint8_t*) d + sizeof(struct mpeg_metadata_descriptor);
if (d->metadata_application_format == 0xffff)
buf+=4;
return *buf;
}
/**
* Accessor for pointer to formid field of an mpeg_metadata_descriptor.
*
* @param d The mpeg_metadata_descriptor structure.
* @return The pointer, or NULL on error.
*/
static inline struct mpeg_metadata_descriptor_format_identifier*
mpeg_metadata_descriptor_formid(struct mpeg_metadata_descriptor *d)
{
uint8_t *buf = (uint8_t*) d + sizeof(struct mpeg_metadata_descriptor);
if (d->metadata_application_format == 0xffff)
buf+=4;
if (*buf != 0xff)
return NULL;
return (struct mpeg_metadata_descriptor_format_identifier*) (buf+1);
}
/**
* Accessor for flags field of an mpeg_metadata_descriptor.
*
* @param d The mpeg_metadata_descriptor structure.
* @return Pointer to the field, or NULL on error.
*/
static inline struct mpeg_metadata_descriptor_flags*
mpeg_metadata_descriptor_flags(struct mpeg_metadata_descriptor *d)
{
uint8_t *buf = (uint8_t*) d + sizeof(struct mpeg_metadata_descriptor);
if (d->metadata_application_format == 0xffff)
buf+=4;
if (*buf == 0xff)
buf+=4;
return (struct mpeg_metadata_descriptor_flags*) buf;
}
/**
* Accessor for service_identifier field of an mpeg_metadata_descriptor.
*
* @param flags Pointer to the mpeg_metadata_descriptor_flags.
* @return Pointer to the field, or NULL on error.
*/
static inline struct mpeg_metadata_descriptor_service_identifier*
mpeg_metadata_descriptor_sevice_identifier(struct mpeg_metadata_descriptor_flags *flags)
{
uint8_t *buf = (uint8_t*) flags + sizeof(struct mpeg_metadata_descriptor_flags);
if (flags->dsm_cc_flag!=1)
return NULL;
return (struct mpeg_metadata_descriptor_service_identifier *) buf;
}
/**
* Accessor for data field of an mpeg_metadata_descriptor_service_identifier.
*
* @param d The mpeg_metadata_descriptor_service_identifier structure.
* @return Pointer to the field.
*/
static inline uint8_t*
mpeg_metadata_descriptor_service_identifier_data(struct mpeg_metadata_descriptor_service_identifier *d)
{
return (uint8_t*) d + sizeof(struct mpeg_metadata_descriptor_service_identifier);
}
/**
* Accessor for decoder_config field of an mpeg_metadata_descriptor.
*
* @param flags Pointer to the mpeg_metadata_descriptor_flags.
* @return Pointer to the field, or NULL on error.
*/
static inline struct mpeg_metadata_descriptor_decoder_config*
mpeg_metadata_descriptor_decoder_config(struct mpeg_metadata_descriptor_flags *flags)
{
uint8_t *buf = (uint8_t*) flags + sizeof(struct mpeg_metadata_descriptor_flags);
if (flags->decoder_config_flags != 1)
return NULL;
if (flags->dsm_cc_flag==1)
buf += 1 + buf[1];
return (struct mpeg_metadata_descriptor_decoder_config*) buf;
}
/**
* Accessor for data field of an mpeg_metadata_descriptor_service_identifier.
*
* @param d The mpeg_metadata_descriptor_service_identifier structure.
* @return Pointer to the field.
*/
static inline uint8_t*
mpeg_metadata_descriptor_decoder_config_data(struct mpeg_metadata_descriptor_decoder_config *d)
{
return (uint8_t*) d + sizeof(struct mpeg_metadata_descriptor_decoder_config);
}
/**
* Accessor for decoder_config_id_record field of an mpeg_metadata_descriptor.
*
* @param flags Pointer to the mpeg_metadata_descriptor_flags.
* @return Pointer to the field, or NULL on error.
*/
static inline struct mpeg_metadata_descriptor_decoder_config_id_record*
mpeg_metadata_descriptor_decoder_config_id_record(struct mpeg_metadata_descriptor_flags *flags)
{
uint8_t *buf = (uint8_t*) flags + sizeof(struct mpeg_metadata_descriptor_flags);
if (flags->decoder_config_flags != 3)
return NULL;
if (flags->dsm_cc_flag==1)
buf += 1 + buf[1];
return (struct mpeg_metadata_descriptor_decoder_config_id_record *) buf;
}
/**
* Accessor for data field of an mpeg_metadata_descriptor_decoder_config_id_record.
*
* @param d The mpeg_metadata_descriptor_decoder_config_id_record structure.
* @return Pointer to the field.
*/
static inline uint8_t*
mpeg_metadata_descriptor_decoder_config_id_record_data(struct mpeg_metadata_descriptor_decoder_config_id_record *d)
{
return (uint8_t*) d + sizeof(struct mpeg_metadata_descriptor_decoder_config_id_record);
}
/**
* Accessor for decoder_config_service_id field of an mpeg_metadata_descriptor.
*
* @param flags Pointer to the mpeg_metadata_descriptor_flags.
* @return Pointer to the field, or NULL on error.
*/
static inline struct mpeg_metadata_descriptor_decoder_config_service_id*
mpeg_metadata_descriptor_decoder_config_service_id(struct mpeg_metadata_descriptor_flags *flags)
{
uint8_t *buf = (uint8_t*) flags + sizeof(struct mpeg_metadata_descriptor_flags);
if (flags->decoder_config_flags != 4)
return NULL;
if (flags->dsm_cc_flag==1)
buf += 1 + buf[1];
return (struct mpeg_metadata_descriptor_decoder_config_service_id *) buf;
}
/**
* Accessor for decoder_config_reserved field of an mpeg_metadata_descriptor.
*
* @param flags Pointer to the mpeg_metadata_descriptor_flags.
* @return Pointer to the field, or NULL on error.
*/
static inline struct mpeg_metadata_descriptor_decoder_config_reserved*
mpeg_metadata_descriptor_decoder_config_reserved(struct mpeg_metadata_descriptor_flags *flags)
{
uint8_t *buf = (uint8_t*) flags + sizeof(struct mpeg_metadata_descriptor_flags);
if ((flags->decoder_config_flags != 5) && (flags->decoder_config_flags != 6))
return NULL;
if (flags->dsm_cc_flag==1)
buf += 1 + buf[1];
return (struct mpeg_metadata_descriptor_decoder_config_reserved *) buf;
}
/**
* Accessor for data field of an mpeg_metadata_descriptor_decoder_config_reserved.
*
* @param d The mpeg_metadata_descriptor_decoder_config_reserved structure.
* @return Pointer to the field.
*/
static inline uint8_t*
mpeg_metadata_descriptor_decoder_config_reserved_data(struct mpeg_metadata_descriptor_decoder_config_reserved *d)
{
return (uint8_t*) d + sizeof(struct mpeg_metadata_descriptor_decoder_config_reserved);
}
/**
* Accessor for private_data field of an mpeg_metadata_descriptor.
*
* @param d The mpeg_metadata_descriptor structure.
* @param flags Pointer to the mpeg_metadata_descriptor_flags.
* @param length Where the number of bytes in the field should be stored.
* @return Pointer to the field.
*/
static inline uint8_t*
mpeg_metadata_descriptor_private_data(struct mpeg_metadata_descriptor *d,
struct mpeg_metadata_descriptor_flags *flags,
int *length)
{
uint8_t *buf = (uint8_t*) flags + sizeof(struct mpeg_metadata_descriptor_flags);
uint8_t *end = (uint8_t*) d + d->d.len + 2;
if (flags->dsm_cc_flag==1)
buf += 1 + buf[1];
if (flags->decoder_config_flags==1)
buf += 1 + buf[1];
if (flags->decoder_config_flags==3)
buf += 1 + buf[1];
if (flags->decoder_config_flags==4)
buf++;
if ((flags->decoder_config_flags==5)||(flags->decoder_config_flags==6))
buf += 1 + buf[1];
*length = end - buf;
return buf;
}
#ifdef __cplusplus
}
#endif
#endif
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