Clarify how SUBSCRIBE filters work, allow Absolute start before Latest #927
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Co-authored-by: ianswett <[email protected]>
| @@ -1391,31 +1391,41 @@ single session and publishers SHOULD treat this as a protocol violation. | |||
| The subscriber specifies a filter on the subscription to allow | |||
| the publisher to identify which objects need to be delivered. | |||
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| There are 3 types of filters: | |||
| All filters have a Start Location and an optional End Group. Only objects | |||
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wonder why is it EndGroup and not End Location?
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#593 removed End Object from Absolute Range.
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Hmm . I missed this somehow. Thanks for sharing the PR. That PR does say this "Specifies a closed subscription starting at StartObject
in StartGroup and ending at EndObject in EndGroup."
I wonder if removing the EndObject was resolving any issue. Sorry for missing it earlier.
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@ianswett do you have the linked issue for that?
| the subscription starts with the first published or received group. | ||
| The `Largest Object` is defined to be the object with the largest Location | ||
| ({{location-structure}}) in the track from the perspective of the endpoint | ||
| processing the SUBSCRIBE message. |
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since the term "LargestObject" is used in multiple places, may be it will benefit from a sub-section so that all the usages refer to the same defintion. It need not be in this PR and we can create a new issue to track, if it helps.
draft-ietf-moq-transport.md
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| The Start Location MAY be less than the `Largest Object`. There is no End Group | ||
| - the subscription is open ended. To receive any object that is published or | ||
| is received after this subscription is processed, a subscriber can use an | ||
| AbsoluteStart filter with Start Location = {0, 0}. |
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Just to confirm this is a way of supporting all objects ?
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Yes, all Objects published or received via subscription pass a filer that starts at {0,0} and has no End Group.
Co-authored-by: Suhas Nandakumar <[email protected]>
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Maybe adding some cases like subgroup can be clearer to readers? |
This is an alternate to #853, attempting to resolve #758.
Fixes: #758
Closes #726