Methods
createNestedWriter() → {shaka.msf.draft20.MessageWriter}
A writer of this draft for a parameter list nested inside another, as
FILL_PARAMETERS carries.
Returns:
fillCurrentGroupParam()
Draft-20 removed the Joining FETCH. A subscriber joins at the current
Group with FILL_PARAMETERS instead: its LOCATION_FILTER, evaluated like a
FETCH's, selects the Groups to fill, and StartGroup alone is relative to
the Next Group, so 1 is the current one (draft-20 section 5.1.6). The
publisher delivers them on a fill fetch stream whose FETCH_HEADER carries
the SUBSCRIBE's Request ID.
The value is a Parameter list of its own, counted and delta encoded like
the one around it.
locationFilterParam()
Draft-20 replaced the Filter Type with a field count: the number of var
ints in the LOCATION_FILTER value is what says which fields are present,
and two of them are a Start Group and a Start Object, absolute and
open-ended (draft-20 section 9.20.10). That is the same request draft-18
spells as AbsoluteStart, so only the encoding changes here.
The one reading that is not absolute is two zeroed fields, which mean the
Next Object instead; callers ask for {0, 0} by sending no filter at all,
so it cannot arrive here.
locationFilterValue(fieldsnon-null) → {Uint8Array}
The value of a LOCATION_FILTER holding these fields. In draft-20 that is
the fields alone: the parameter's length says how many there are.
Parameters:
| Name | Type | Description |
|---|---|---|
fields |
Array<bigint> |
Returns:
- Type
- Uint8Array
marshalFetch()
Draft-20 removed the Fetch Type field along with the Joining variants, and
moved the range out of the message and into the LOCATION_FILTER parameter,
leaving a body shaped exactly like SUBSCRIBE.
The range asked for is the same one draft-18 puts in the message, so it
goes out as a filter rather than being dropped: an absent LOCATION_FILTER
means an unfiltered fetch of the whole track (draft-20 section 10.2.9),
which is a different request.
marshalJoiningFetch()
Draft-20 has no Joining FETCH; fillCurrentGroupParam() is what joins.