ISO/IEC 13818-1:2000/Amd 1:2003

INTERNATIONAL ISO/IEC
STANDARD 13818-1
Second edition
2000-12-01
AMENDMENT 1
2003-08-01
Corrected version
2003-10-15


Information technology — Generic
coding of moving pictures and
associated audio information: Systems
AMENDMENT 1: Carriage of metadata over
ITU-T Rec. H.222.0ISO/IEC 13818-1
streams
Technologies de l'information — Codage générique des images
animées et du son associé: Systèmes
AMENDEMENT 1: Transport de métadonnées sur «streams»
ITU-T Rec. H.222.0ISO/CEI 13818-1




Reference number
ISO/IEC 13818-1:2000/Amd.1:2003(E)
©
ISO/IEC 2003

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ISO/IEC 13818-1:2000/Amd.1:2003(E)
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ii © ISO/IEC 2003 — All rights reserved

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ISO/IEC 13818-1:2000/Amd.1:2003(E)
Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that are members of
ISO or IEC participate in the development of International Standards through technical committees
established by the respective organization to deal with particular fields of technical activity. ISO and IEC
technical committees collaborate in fields of mutual interest. Other international organizations, governmental
and non-governmental, in liaison with ISO and IEC, also take part in the work. In the field of information
technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of the joint technical committee is to prepare International Standards. Draft International
Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as
an International Standard requires approval by at least 75 % of the national bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights.
Amendment 1 to ISO/IEC 13818-1:2000 was prepared by Joint Technical Committee ISO/IEC JTC 1,
Information technology, Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia
information, in collaboration with ITU-T. The identical text is published as ITU-T Rec. H.222.0.
In this corrected version of ISO/IEC 13818-1:2000/Amd.1:2003 a “reserved” field has been inserted in
Table AMD1-13.
© ISO/IEC 2003 — All rights reserved iii

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ISO/IEC 13818-1:2000/Amd.1:2003 (E)
INTERNATIONAL STANDARD
ITU-T RECOMMENDATION
Information technology – Generic coding of moving pictures and
associated audio information: Systems
Amendment 1

Carriage of metadata over ITU-T Rec. H.222.0 | ISO/IEC 13818-1 streams
1) Subclause 2.1
Insert the following new definitions and renumber existing ones accordingly:
2.1.28 metadata: Information to describe audiovisual content and data essence in a format defined by ISO or any
other authority.
2.1.29 metadata access unit: A global structure within metadata that defines the fraction of metadata that is
intended to be decoded at a specific instant in time. The internal structure of a metadata Access Unit is defined by the
format of the metadata.
2.1.30 metadata application format: Identifies the format of the application that uses the metadata; signals
application specific information for transport of metadata.
2.1.31 metadata decoder configuration information: Data needed by a receiver to decode a specific metadata
service. Depending on the format of the metadata, decoder configuration information may or may not be needed.
2.1.32 metadata format: Identifies the coding format of metadata.
2.1.33 metadata service: Coherent set of metadata of the same format delivered to a receiver for a specific purpose.
2.1.34 metadata service id: Identifier of a specific metadata service; used for some transport methods of the
metadata.
2.1.35 metadata stream: The concatenation or collection of metadata Access Units from one or more metadata
services.
 ITU-T Rec. H.222.0 (2000)/Amd.1 (12/2002) 1

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ISO/IEC 13818-1:2000/Amd.1:2003 (E)
2) Table 2-18
Define a tag for a metadata stream by replacing Table 2-18 in clause 2:
Table 2-18 – Stream_id assignments
Stream_id Note Stream coding
1011 1100 (1) program_stream_map
1011 1101 (2) private_stream_1
1011 1110 padding_stream
1011 1111 (3) private_stream_2
110x xxxx ISO/IEC 13818-3 or ISO/IEC 11172-3 or ISO/IEC 13818-7 or ISO/IEC 14496-3 audio stream
number x xxxx
1110 xxxx ITU-T Rec. H.262 | ISO/IEC 13818-2 or ISO/IEC 11172-2 or ISO/IEC 14496-2 video stream
number xxxx
1111 0000 (3) ECM_stream
1111 0001 (3) EMM_stream
1111 0010 (5) ITU-T Rec. H.222.0 | ISO/IEC 13818-1 Annex A or ISO/IEC 13818-6_DSM-CC_stream
1111 0011 (2) ISO/IEC_13522_stream
1111 0100 (6) ITU-T Rec. H.222.1 type A
1111 0101 (6) ITU-T Rec. H.222.1 type B
1111 0110 (6) ITU-T Rec. H.222.1 type C
1111 0111 (6) ITU-T Rec. H.222.1 type D
1111 1000 (6) ITU-T Rec. H.222.1 type E
1111 1001 (7) ancillary_stream
1111 1010 ISO/IEC14496-1_SL-packetized_stream
1111 1011 ISO/IEC14496-1_FlexMux_stream
1111 1100 metadata stream
1111 1101 reserved data stream
1111 1110 reserved data stream
1111 1111 (4) program_stream_directory
The notation x means that the values '0' or '1' are both permitted and results in the same stream type. The stream number is given
by the values taken by the x's.
NOTE 1 – PES packets of type program_stream_map have unique syntax specified in 2.5.4.1.
NOTE 2 – PES packets of type private_stream_1 and ISO/IEC_13552_stream follow the same PES packet syntax as those for
ITU-T Rec. H.262 | ISO/IEC 13818-2 video and ISO/IEC 13818-3 audio streams.
NOTE 3 – PES packets of type private_stream_2, ECM_stream and EMM_stream are similar to private_stream_1 except no
syntax is specified after PES_packet_length field.
NOTE 4 – PES packets of type program_stream_directory have a unique syntax specified in 2.5.5.
NOTE 5 – PES packets of type DSM-CC_stream have a unique syntax specified in ISO/IEC 13818-6.
NOTE 6 – This stream_id is associated with stream_type 0x09 in Table 2-29.
NOTE 7 – This stream_id is only used in PES packets, which carry data from a Program Stream or an ISO/IEC 11172-1 System
Stream, in a Transport Stream (refer to 2.4.3.7).

2 ITU-T Rec. H.222.0 (2000)/Amd.1 (12/2002)

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ISO/IEC 13818-1:2000/Amd.1:2003 (E)
3) Table 2-26
Define a metadata_section tag by replacing Table 2-26 in clause 2:
Table 2-26 – table_id assignment values
Value Description
0x00 Program_association_section
0x01 Conditional_access_section (CA_section)
0x02 TS_program_map_section
0x03 TS_description_section
0x04 ISO_IEC_14496_scene_description_section
0x05 ISO_IEC_14496_object_descriptor_section
0x06 Metadata_section
0x07-0x37 ITU-T Rec. H.222.0 | ISO/IEC 13818-1 Reserved
0x38-0x3F Defined in ISO/IEC 13818-6
0x40-0xFE User private
0xFF Forbidden
4) Table 2-29
Define tags for a metadata carried in PES packets, metadata_sections and DSM-CC by replacing Table 2-29 in
clause 2:
Table 2-29 – Stream type assignments
Value Description
0x00 ITU-T | ISO/IEC Reserved
0x01 ISO/IEC 11172 Video
ITU-T Rec. H.262 | ISO/IEC 13818-2 Video or ISO/IEC
0x02
11172-2 constrained parameter video stream
0x03 ISO/IEC 11172 Audio
0x04 ISO/IEC 13818-3 Audio
0x05 ITU-T Rec. H.222.0 | ISO/IEC 13818-1 private_sections
0x06 ITU-T Rec. H.222.0 | ISO/IEC 13818-1 PES packets
containing private data
0x07 ISO/IEC 13522 MHEG
0x08 ITU-T Rec. H.222.0 | ISO/IEC 13818-1 Annex A DSM-CC
0x09 ITU-T Rec. H.222.1
0x0A ISO/IEC 13818-6 type A
0x0B ISO/IEC 13818-6 type B
0x0C ISO/IEC 13818-6 type C
0x0D ISO/IEC 13818-6 type D
0x0E ITU-T Rec. H.222.0 | ISO/IEC 13818-1 auxiliary
0x0F ISO/IEC 13818-7 Audio with ADTS transport syntax
0x10 ISO/IEC 14496-2 Visual
0x11 ISO/IEC 14496-3 Audio with the LATM transport syntax
as defined in ISO/IEC 14496-3/Amd.1
0x12 ISO/IEC 14496-1 SL-packetized stream or FlexMux stream
carried in PES packets
0x13 ISO/IEC 14496-1 SL-packetized stream or FlexMux stream
carried in ISO/IEC14496_sections.
0x14 ISO/IEC 13818-6 Synchronized Download Protocol
 ITU-T Rec. H.222.0 (2000)/Amd.1 (12/2002) 3

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ISO/IEC 13818-1:2000/Amd.1:2003 (E)
Table 2-29 – Stream type assignments
Value Description
0x15 Metadata carried in PES packets using the Metadata Access
Unit Wrapper defined in 2.12.4.1
0x16 Metadata carried in metadata_sections
0x17 Metadata carried in ISO/IEC 13818-6 (DSM-CC) Data
Carousel
0x18 Metadata carried in ISO/IEC 13818-6 (DSM-CC) Object
Carousel
0x19 Metadata carried in ISO/IEC 13818-6 Synchronized
Download Protocol using the Metadata Access Unit
Wrapper defined in 2.12.4.1
0x1A-0x7F ITU-T Rec. H.222.0 | ISO/IEC 13818-1 Reserved
0x80-0xFF User Private
5) Table 2-39
Define tags for a metadata related descriptors by replacing Table 2-39 in clause 2:
Table 2-39 – Program and program element descriptors
descriptor_tag TS PS Identification
0 n/a n/a Reserved
1 n/a n/a Reserved
2 X X video_stream_descriptor
3 X X audio_stream_descriptor
4 X X hierarchy_descriptor
5 X X registration_descriptor
6 X X data_stream_alignment_descriptor
7 X X target_background_grid_descriptor
8 X X Video_window_descriptor
9 X X CA_descriptor
10 X X ISO_639_language_descriptor
11 X X System_clock_descriptor
12 X X Multiplex_buffer_utilization_descriptor
13 X X Copyright_descriptor
14 X Maximum_bitrate_descriptor
15 X X Private_data_indicator_descriptor
16 X X Smoothing_buffer_descriptor
17 X STD_descriptor
18 X X IBP_descriptor
19-26 X Defined in ISO/IEC 13818-6
27 X X MPEG-4_video_descriptor
28 X X MPEG-4_audio_descriptor
29 X X IOD_descriptor
30 X SL_descriptor
31 X X FMC_descriptor
32 X X External_ES_ID_descriptor
33 X X MuxCode_descriptor
34 X X FmxBufferSize_descriptor
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ISO/IEC 13818-1:2000/Amd.1:2003 (E)
Table 2-39 – Program and program element descriptors
descriptor_tag TS PS Identification
35 X MultiplexBuffer_descriptor
36 X X Content_labeling_descriptor
37 X X Metadata_pointer_descriptor
38 X X Metadata_descriptor
39 X X Metadata_STD_descriptor
40-63 n/a n/a ITU-T Rec. H.222.0 | ISO/IEC 13818-1 Reserved
64-255 n/a n/a User Private
6) New subclauses after subclause 2.6.55
Add the following subclauses after subclause 2.6.55:
2.6.56 Content labelling descriptor
The content labelling descriptor assigns a label to content; the label can be used by metadata to reference the associated
content. This label, the content_reference_id_record, is metadata application format specific. The content labelling
descriptor is associated with a content segment. For the purpose of this clause, a content segment is defined as a portion
in time of a program, an elementary stream (such as audio or video) or any combination of programs or elementary
streams. The descriptor may be included in the PMT in the descriptor loop for either the program or an elementary
stream, but may also be contained in tables not defined in this Specification, for example tables to describe segments of
programs or elementary streams. The content labelling descriptor also provides information on which content time base
is used and on the offset between the content time base and the metadata time base. When the Normal Play Time (NPT)
concept of DSM-CC, as specified in IEC/ISO 13818-6, is used as the content time base, the ID of the NPT time base is
provided. The descriptor allows for carriage of private data.
 ITU-T Rec. H.222.0 (2000)/Amd.1 (12/2002) 5

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ISO/IEC 13818-1:2000/Amd.1:2003 (E)
Table Amd.1-1 – Content labelling descriptor
Syntax No. of bits Mnemonic
Content_labeling_descriptor () {
descriptor_tag 8 uimsbf
descriptor_length 8 uimsbf
metadata_application_format 16 uimsbf
if (metadata_application_format== 0xFFFF){
 metadata_application_format_identifier 32 uimsbf
}
content_reference_id_record_flag 1 bslbf
content_time_base_indicator 4 uimsbf
reserved 3 bslbf
if (content_reference_id_record_flag == ‘1’){
 content_reference_id_record_length 8 uimsbf
 for (i=0; i   content_reference_id_byte 8 bslbf
 }
}
if (content_time_base_indicator== 1|2){
 reserved 7 bslbf
 content_time_base_value 33 uimsbf
 reserved 7 bslbf
 metadata_time_base_value 33 uimsbf
}
if (content_time_base_indicator== 2){
 reserved 1 bslbf
 contentId 7 uimsbf
}
if (content_time_base_indicator==3|4|5|6|7){
 time_base_association_data_length 8 uimsbf
 for (i=0; i< time_base_association_data_length;i++){
  reserved 8 bslbf
 }
}
for (i=0; i  private_data_byte 8 bslbf
}
}

2.6.57 Semantic definition of fields in content labelling descriptor
metadata_application_format: The metadata_application_format is a 16-bit field, coded as defined in Table Amd.1-2,
that specifies the application responsible for defining usage, syntax and semantics of the content_reference_id record
and of any other privately defined fields in this descriptor. See also subclause 2.12.1. The value 0xFFFF indicates that
the format is signalled by the value carried in the metadata_application_format_identifier field.
Table Amd.1-2 – metadata_application_format
Value Description
0x0000-0x00FF Reserved
0x0100-0xFFFE User defined
0xFFFF Defined by the
metadata_application_format_identifier field

metadata_application_format_identifier: The coding of this 32-bit field is fully equivalent to the coding of the
format_identifier field in the registration_descriptor, as defined in subclause 2.6.8.
NOTE – The assigned Registration Authority for the format_identifier field is SMPTE.
content_reference_id_record_flag: The content_reference_id_record_flag is a 1-bit flag that signals the presence of a
content_reference_id_record in this descriptor.
content_time_base_indicator: The content_time_base_indicator is a 4-bit field which specifies the used content time
base. If the descriptor is associated with a program, then the content time base applies to all streams that are part of that
program. A value of 1 indicates usage of the STC, while a value of 2 indicates usage of NPT, the Normal Play Time as
defined in ISO/IEC 13818-6. The values between 8 and 15 indicate usage of a privately defined content time base. If
coded with a value of 0, no content time base is defined in this descriptor. If no content time base is specified for a
6 ITU-T Rec. H.222.0 (2000)/Amd.1 (12/2002)

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ISO/IEC 13818-1:2000/Amd.1:2003 (E)
program or stream, then the mapping of time references in the metadata to the content is not defined in this
Specification.
Table Amd.1-3 – Content_time_base_indicator values
Value Description
0 No content time base defined in this descriptor
1 Use of STC
2 Use of NPT
3-7 Reserved
8-15 Use of privately defined content time base

content_reference_id_record_length: The content_reference_id_record_length is an 8-bit field that specifies the
number of content_reference_id_bytes immediately following this field. This field shall not be coded with the value 0.
content_reference_id_byte: The content_reference_id_byte is part of a string of one or more contiguous bytes that
assigns one or more reference identifications (labels) to the content to which this descriptor is associated. The format of
this byte string is defined by the body indicated by the coded value in the metadata_application_format field.
content_time_base_value: The content_time_base_value is a 33-bit field that specifies a value in units of 90 kHz of the
content time base indicated by the content_time_base_indicator field.
metadata_time_base_value: The metadata_time_base_value is a 33-bit field that is coded in units of 90 kHz. The field
is coded with the value of the metadata time base at the instant in time in which the time base indicated by
content_time_base_indicator reaches the value encoded in the content_time_base_value field. Note that the metadata
time base may use any time scale, but that its value is to be coded in units of 90 kHz. For example, if a SMPTE type of
time code is used, then the number of hours, minutes, seconds and frames is expressed in the corresponding number of
90 kHz units.
contentId: The contentId is a 7-bit field that specifies the value of the content_Id field in the NPT Reference Descriptor
for the applied NPT time base.
time_base_association_data_length: The time_base_association_data_length is an 8-bit field that specifies the number
of reserved bytes immediately following this field. The reserved bytes can be used to carry time base association data
for time bases defined in future.
private_data_byte: The private_data_byte is an 8-bit field. The private_data_bytes represent data, the format of which
is defined privately. These bytes can be used to provide additional information as deemed appropriate. The use of these
bytes is defined by the metadata application format.
2.6.58 Metadata pointer descriptor
The metadata pointer descriptor points to a single metadata service and associates this metadata service with
audiovisual content in an ITU-T Rec. H.222.0 | ISO/IEC 13818-1 stream. The metadata is associated with the content
within the context of the descriptor. The context is defined by the location of the descriptor. In a transport stream, the
descriptor may be located in the PMT in the descriptor loop for either the program or an elementary stream, but may
also be located in tables not defined in this Specification, such as tables describing bouquets of broadcast services. The
metadata may be located in an ITU-T Rec. H.222.0 | ISO/IEC 13818-1 stream, but the same metadata may also be
provided on alternative locations, such as the Internet.
The descriptor may contain location information of metadata that is not carried in an ITU-T Rec. H.222.0 | ISO/IEC
13818-1 stream; the coding of the location information is metadata application format specific. The descriptor allows
for carriage of private data.
For metadata carried in an ITU-T Rec. H.222.0 | ISO/IEC 13818-1 stream, the descriptor specifies the tools used for
such carriage. If the metadata is carried in PES packets, metadata sections, or ISO/IEC 13818-6 synchronized
download sections, the metadata_service_id field identifies the metadata service in the referenced metadata stream. If a
ISO/IEC 13818-6 carousel is used to carry the metadata, then the private data may provide information to signal the
metadata service, such as the applied value of the module_id for carriage of the metadata in a data carousel, and the file
name of the metadata when the object carousel is used.
Receivers should be aware that multiple metadata services may be pointed to from the same program or audiovisual
stream (as defined by the context of the descriptor). A unique metadata pointer descriptor shall be used to point to each
 ITU-T Rec. H.222.0 (2000)/Amd.1 (12/2002) 7

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ISO/IEC 13818-1:2000/Amd.1:2003 (E)
metadata service used by the program or audiovisual stream. Similarly, the same metadata service can be pointed to
from several programs or audiovisual streams by using a separate metadata pointer descriptors for each association.
Table Amd.1-4 – Metadata pointer descriptor
Syntax No. of bits Mnemonic
Metadata_pointer_descriptor () {
descriptor_tag 8 uimsbf
descriptor_length 8 uimsbf
metadata_application_format 16 uimsbf
if (metadata_application_format== 0xFFFF){
 metadata_application_format_identifier 32 uimsbf
}
metadata_format 8 uimsbf
if (metadata_format== 0xFF){
 metadata_format_identifier 32 uimsbf
}
metadata_service_id 8 uimsbf
metadata_locator_record_flag 1 bslbf
MPEG_carriage_flags 2 uimsbf
reserved 5 bslbf
if (metadata_locator_record_flag == ‘1’){
 metadata_locator_record_length 8 uimsbf
 for (i=0; i< metadata_locator_record_length;i++){
  metadata_locator_record_byte 8 bslbf
 }
}
if (MPEG_carriage_flags == 0|1|2){
 program_number 16 uimsbf
}
if (MPEG_carriage_flags == 1){
 transport_stream_location 16 uimsbf
 transport_stream_id 16 uimsbf
}
for (i=0; i  private_data_byte 8 bslbf
}
}

2.6.59 Semantic definition of fields in metadata pointer descriptor
metadata_application_format: The metadata_application_format is a 16-bit field that specifies the application
responsible for defining usage, syntax and semantics of the metadata_locator_record record and any other privately
defined fields in this descriptor. The coding of this field is defined in Table Amd.1-2 in subclause 2.6.57.
metadata_application_format_identifier: The coding of this field is defined in subclause 2.6.57.
metadata_format: The metadata_format is an 8-bit field that indicates the format and coding of the metadata. The
coding of this field is specified in Table Amd.1-5.
Table Amd.1-5 – Metadata format values
Value Description
0x00-0x0F Reserved
0x10 ISO/IEC 15938-1 TeM
0x11 ISO/IEC 15938-1 BiM
0x12-0x3E Reserved
0x3F Defined by metadata application format
0x40-0xFE Private use
0xFF Defined by metadata_format_identifier field

The values 0x10 and 0x11 identify ISO/IEC 15938-1 defined data. The value 0x3F indicates that the format is defined
by the body indicated by the metadata_application_format field. The values in the inclusive range of 0x40 up to 0xFE
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ISO/IEC 13818-1:2000/Amd.1:2003 (E)
are available to signal use of private formats. The value 0xFF indicates that the format is signalled by the
metadata_format_identifier field.
metadata_format_identifier: The coding of this 32-bit field is fully equivalent to the coding of the format_identifier
field in the registration_descriptor, as defined in subclause 2.6.8.
NOTE – SMPTE is assigned as Registration Authority for the format_identifier field.
metadata_service_id: This 8-bit field references the metadata service. It is used for retrieving a metadata service from
within a metadata stream.
metadata_locator_record_flag: The metadata_locator_record_flag is a 1-bit field which, when set to '1' indicates that
associated metadata is available on a location outside of an ITU-T Rec. H.222.0 | ISO/IEC 13818-1 stream, specified in
a metadata_locator_record.
MPEG_carriage_flags: The MPEG_carriage_flags is a 2-bit field which specifies if the metadata stream containing the
associated metadata service is carried in an ITU-T Rec. H.222.0 | ISO/IEC 13818-1 stream, and if so, whether the
associated metadata is carried in a Transport Stream or Program Stream. The coding of this field is defined in
Table Amd.1-6.
Table Amd.1-6 – MPEG_carriage_flags
Value Description
0 Carriage in the same Transport Stream where this metadata pointer descriptor is carried.
1 Carriage in a different Transport Stream from where this metadata pointer descriptor is
carried.
2 Carriage in a Program Stream. This may or may not be the same Program Stream in which
this metadata pointer descriptor is carried.
3 None of the above.

metadata_locator_record_length: The metadata_locator_record_length is an 8-bit field that specifies the number of
metadata_locator_record_bytes immediately following. This field shall not be coded with the value 0.
metadata_locator_record_byte: The metadata_locator_record_byte is part of a string of one or more contiguous bytes
that form the metadata locator record. This record specifies one or more locations outside of an ITU-T Rec. H.222.0 |
ISO/IEC 13818-1 stream. The format of the metadata locator record is defined by the metadata application signalled by
the metadata_application_format field. The record may for example contain Internet URLs that specify where the
metadata can be found, possibly in addition to their location(s) in the Transport Stream. If the MPEG_carriage_flags is
coded with the value 0, 1 or 2 and the metadata locator record is present, then this signals alternative locations for the
same metadata.
program_number: The program_number is a 16-bit field that identifies the program_number of the MPEG-2 program
in the ITU-T Rec. H.222.0 | ISO/IEC 13818-1 stream in which associated metadata is carried. If the
MPEG_carriage_flags have the value 0, then the transport stream is the current one, and if the MPEG_carriage_flags
have the value 1, it is the transport stream signalled by the fields transport_stream_location and transport_stream_id.
transport_stream_location: The transport_stream_location is a 16-bit field that is defined privately. For example, this
field may be used by applications to signal the original_network_id defined by ETSI.
transport_stream_id: The transport_stream_id is a 16-bit field that identifies the Transport Stream in which associated
metadata is carried.
private_data_byte: The private_data_byte is an 8-bit field. The private_data_bytes represent data, the format of which
is defined privately. These bytes can be used to provide additional information as deemed appropriate.
2.6.60 Metadata descriptor
The metadata descriptor specifies parameters of a metadata service carried in an MPEG-2 TS or PS. In an MPEG-2 TS,
the descriptor is included in the PMT in the descriptor loop for the elementary stream that carries the metadata service.
The descriptor specifies the format of the associated metadata, and contains the value of the metadata_service_id to
identify the metadata service to which the metadata descriptor applies. As needed, the descriptor can convey
information to identify the metadata service from a collection of metadata transmitted in a DSM-CC carousel.
Optionally metadata application format specific private data can be carried.
 ITU-T Rec. H.222.0 (2000)/Amd.1 (12/2002) 9

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ISO/IEC 13818-1:2000/Amd.1:2003 (E)
The metadata descriptor also signals whether decoder configuration is required and is able to carry the decoder
configuration bytes, but this is only practical if the number of these bytes is small. If the decoder configuration
information is too large to be carried by the descriptor, it shall be contained in a metadata service. This may be within
the metadata service itself, or in another metadata service within the same program. Identification of the metadata
service that contains the decoder configuration is provided by the metadata descriptor. If a DSM-CC carousel is used to
carry the decoder configuration, then information can be provided how to retrieve the decoder configuration from the
carousel.
Table Amd.1-7 – Metadata descriptor
Syntax No. of bits Mnemonic
Metadata_descriptor () {
descriptor_tag 8 uimsbf
descriptor_length 8 uimsbf
metadata_application_format 16 uimsbf
if (metadata_application_format == 0xFFFF) {
 metadata_application_format_identifier 32 uimsbf
}
metadata_format 8 uimsbf
if (metadata_format== 0xFF){
 metadata_format_identifier 32 uimsbf
}
metadata_service_id 8 uimsbf
decoder_config_flags 3 bslbf
DSM-CC_flag 1 bslbf
reserved 4 bslbf
if (DSM-CC_flag == ‘1’){
 service_identification_length 8 uimsbf
 for(i=0; i   service_identification_record_byte 8 bslbf
 }
}
if (decoder_config_flags == ‘001’) {
 decoder_config_length 8 uimsbf
 for(i=0; i   decoder_config_byte 8 bslbf
 }
}
if (decoder_config_flags == ‘011’) {
 dec_config_identification_record_length 8 uimsbf
 for(i=0;i   dec_config_identification_record_byte 8 bslbf
 }
}
if (decoder_config_flags == ‘100’) {
 decoder_config_metadata_service_id 8 uimsbf
}
if (de
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