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[Bug 18635] New: HTMLMediaElement seeking algorithm integration

From: <bugzilla@jessica.w3.org>
Date: Tue, 21 Aug 2012 09:51:42 +0000
To: public-html-media@w3.org
Message-ID: <bug-18635-5436@http.www.w3.org/Bugs/Public/>
https://www.w3.org/Bugs/Public/show_bug.cgi?id=18635

           Summary: HTMLMediaElement seeking algorithm integration
           Product: HTML WG
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Media Source Extensions
        AssignedTo: adrianba@microsoft.com
        ReportedBy: philipj@opera.com
         QAContact: public-html-bugzilla@w3.org
                CC: mike@w3.org, public-html-media@w3.org


http://dvcs.w3.org/hg/html-media/raw-file/tip/media-source/media-source.html#mediasource-seeking
http://dev.w3.org/html5/spec/media-elements.html#dom-media-seek

MSE hooks in to the HTMLMediaElement by saying "The media element seeking
algorithm starts and has reached the stage where it is about to fire the
seeking event." HTML's step 8 says "Queue a task to fire a simple event named
seeking at the element." MSE doesn't say if its steps should be run before the
event is queued or before it is actually fired, but the intention is clearly to
insert steps before step 8.

Since MSE replaces the network layer, it would make more sense to hook in to
step 9: "Set the current playback position to the given new playback position."
This is the step of the HTMLMediaElement seek algorithm where the media
framework underlying HTMLMediaElement will be notified and begin to fetch the
required data, so it is where MSE would come into play.

Suggestion: Specify that the steps of MSE run as part of step 9, or between
step 9 and 10. This would make more sense in Opera's layering, and the only
observable difference is the order of the seeking and sourceopen events.

Finally, note that MSE points to #dom-media-seeking instead of #dom-media-seek,
almost certainly a typo.

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Received on Tuesday, 21 August 2012 09:51:43 UTC

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