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Re: Fwd: Proposal for output device selection

From: Harald Alvestrand <harald@alvestrand.no>
Date: Wed, 21 Aug 2013 00:16:10 +0200
Message-ID: <5213EAAA.9020402@alvestrand.no>
To: public-html@w3.org, Justin Uberti <juberti@google.com>, Stefan Hakansson LK <stefan.lk.hakansson@ericsson.com>
On 08/20/2013 07:32 PM, Janina Sajka wrote:
> I am writing to note that the HTML-A11Y TF identified output device
> selection as an a11y requirement at Sec. 4.8 of its "Media Accessibility
> User Requirements" document:
>
> http://www.w3.org/TR/media-accessibility-reqs/#requirements-on-the-parallel-use-of-alternate-content-on-potentially-------multiple-devices-in-parallel
>
> I would hasten to admit we did not articulate this requirement as
> clearly as we undoubtedly should before finalizing our document as a W3C
> Note. So, I would highlight two points:
>
> 1.)	In addition to selecting a particular device for output of any associated content stream, we seek the
> ability to identify multiple devices as output targets for a particular
> content stream.

This is inherent in the WebRTC "MediaStream" model - one MediaStream can
be connected to multiple sinks (for instance <audio> or <video> tags),
which then can be assigned to multiple output devices.
>
> 2.)	We would expect content in all devices to stay synchronized.
The WebRTC model indicates that a stream's tracks are always
synchronized. It seems logical to assume (but we haven't made this
explicit anywhere) that multiple sinks for the same stream would also
stay in sync.
Received on Tuesday, 20 August 2013 22:16:39 UTC

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