TS 102 323 - V1.4.1 - Digital Video Broadcasting (DVB ... - ETSI

20
Table 5: Permitted locations of the metadata pointer descriptor
ETSI
ETSI TS 102 323 V1.4.1 (2010-01)
Scope Linkage location Example metadata fragment types
Global BAT, NIT, common descriptor loop of the
RNT, resolution provider descriptor loop of
the RNT
BroadcastEvent, Schedule, ServiceInformation,
ProgramInformation, GroupInformation, Review,
SegmentInformation, SegmentGroupInformation,
PersonName, OrganizationName.
DVB Service Service loop of the SDT BroadcastEvent, Schedule, ServiceInformation.
CRID authority CRID authority descriptor loop of the RNT ProgramInformation, GroupInformation, Review,
SegmentInformation, SegmentGroupInformation,
PersonName, OrganizationName.
5.3.3.2 Semantics
This clause defines the use and additional semantics of fields of the metadata pointer descriptor.
See ISO/IEC 13818-1 [9], clause 2.6.58 for the format and basic semantics of this descriptor.
This descriptor shall be used with the constraints given below when associating an entity in a DVB network with a
metadata service delivering relevant TV-Anytime metadata.
metadata_application_format: This field shall have the same value as encoded in the metadata_application_format
field of the metadata descriptor describing the target metadata service (see clause 5.3.4), that is the metadata descriptor
with matching metadata_service_id carried in the PMT sub_table indicated by this descriptor.
metadata_application_format_identifier: This field shall not be used.
metadata_format: The value of this field shall be set according to table 6. If the metadata service is delivered in a
DVB transport stream, the value of this field shall match the value of the metadata_format field in the metadata
descriptor with a matching value of metadata_service_id in the PMT sub_table identified by this descriptor (see
clause 5.3.4).
Table 6: metadata_format
Value Semantics
0x00 to 0x3E Not used in the present document.
0x3F Defined by metadata application format.
0x40 to 0xEF User defined.
0xF0 The encoding and encapsulation format as defined in
clauses 9.3 and 9.4 of the present document.
0xF1 to 0xF7 DVB Reserved.
0xF8 to 0xFE User defined.
0xFF Not used in the present document.
metadata_format_identifier: This field shall not be used.
metadata_service_id: This field shall be used to identify which metadata service this descriptor references. When that
metadata service is delivered in a DVB transport stream, the target metadata service shall be described by a metadata
descriptor with a matching value of metadata_service_id in the PMT sub_table identified by this descriptor (see
clause 5.3.4).
metadata_locator_record_flag: This field shall be set to '0' if this descriptor references a metadata service delivered in
a DVB transport stream. Otherwise, this field shall be set to '1' (for example, if delivered over bi-directional IP
according to TS 102 822-6-1 [18]). If the metadata_format field is set to 0xF1 then this field shall be set to '1'.
metadata_locator_record_length, metadata_locator_record: An option that may be used to point to an arbitrary
URL not within a DVB network. If it is used the metadata locator record shall contain a compliant URI (see
RFC 3986 [2]) which shall be encoded as described in clause 6.2. If this field contains a HTTP URL as specified in
RFC 1945 [19], then that URL shall reference a metadata service that conforms to TS 102 822-6-1 [18].
MPEG_carriage_flags: A 2-bit field that shall be coded according to table 7. If the metadata_locator_record_flag is set
to '1' then this field shall be set to 3. Otherwise, this field shall be set to either 0 or 1.