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[Bug 21855] Avoid network traffic and duplicate sessions for the same key(s)

From: <bugzilla@jessica.w3.org>
Date: Tue, 01 Oct 2013 14:55:24 +0000
To: public-html-bugzilla@w3.org
Message-ID: <bug-21855-2486-KchRvMSOgA@http.www.w3.org/Bugs/Public/>
https://www.w3.org/Bugs/Public/show_bug.cgi?id=21855

--- Comment #7 from Adrian Bateman [MSFT] <adrianba@microsoft.com> ---
I don't think we should try to completely solve this issue in v1. I think it is
reasonable to allow an optimization to allow a session to move from CREATED to
READY to avoid an initial duplicate network request. It is not necessary for
all CDMs to support this optimization. The only impact is that an application
has to know it could get a keyready event without a keymessage event. At this
point we don't support further optimizations. If a session needs to go back to
PENDING it does so independently (meaning all "shared" sessions may also go
back to PENDING).

This avoids the questions about which sessions should receive subsequent
messages. The question about the ever growing set of MediaKeySession objects
exists beyond this issue. I'm not sure if we need to do anything in v1 to
handle this.

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