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[Bug 25409] New: Allow applications to detect whether a key is usable before using it to decrypt content

From: <bugzilla@jessica.w3.org>
Date: Mon, 21 Apr 2014 22:50:15 +0000
To: public-html-media@w3.org
Message-ID: <bug-25409-5436@http.www.w3.org/Bugs/Public/>
https://www.w3.org/Bugs/Public/show_bug.cgi?id=25409

            Bug ID: 25409
           Summary: Allow applications to detect whether a key is usable
                    before using it to decrypt content
           Product: HTML WG
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P3
         Component: Encrypted Media Extensions
          Assignee: adrianba@microsoft.com
          Reporter: ddorwin@google.com
        QA Contact: public-html-bugzilla@w3.org
                CC: mike@w3.org, public-html-media@w3.org

Currently, the only way to detect whether a key is usable is to try to play
content that requires that key and see if it succeeds. When the answer is "no",
this may result in a jarring user experience (i.e. dropped frames, pause,
rebuffering). Such a scenario could be common in an adaptive streaming
scenario.

Instead, EME should allow the application to determine ahead of time which
key(s) can be used and thus which stream(s) are playable. Since the answers
depend on the license, CDM, and/or hardware, the results cannot be returned
synchronously, and they could even vary during playback.

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Received on Monday, 21 April 2014 22:50:16 UTC

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