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Re: CfC: The Media Capture API FPWD

From: Philip Gladstone <pgladstone@cisco.com>
Date: Fri, 03 Sep 2010 10:45:59 -0400
Message-ID: <4C810A27.3090502@cisco.com>
CC: public-device-apis@w3.org
 * The current draft does not appear to permit the web app to choose
which camera to use -- presumably this will be a choice presented to the
user when the camera app is started. Is this intentional? For example, I
have a four port video capture device. I would like to be able to say
'capture picture on each device in turn, and send the results to my
server, forever'. Once I have provided the permission to do that, it
ought to do that. However, I can't choose the input port, and I can't
say 'automatically take picture' (unless this is an option of the camera

* It is unclear (to me) whether the MediaFile that is returned when a
capture completes is persistent or not. Also, the handling of it will be
rather different if it is a data: url. The issue here is what happens if
the web app loses the MediaFile. Does the underlying image continue to
exist (potentially consuming space on a memory card)? Can these
MediaFile references be recovered in a later session?

* Is the cancel on the PendingOperation synchronous? I.e. once that
method returns, has the PendingOperation been cancelled, or is it only
canceled when (for example) the errorCB is called with a 'CANCELED'
error status. If an image capture is cancelled once the user has
captured one image, is that image lost, or does it get returned on a
successCB? If it is lost, does it remain in persistent storage?

Apologies if these questions are too detail oriented...



On 01-Sep-10 15:37, Frederick.Hirsch@nokia.com wrote:
> Hi all,
> Robin is away, but we agreed  at the teleconference today to start a call for consensus on the Media Capture API, ending next week ( publication will include the change from ACTION-267 to add the note regarding ISSUE-101 to the text, this has not been done yet.) [1]
> This is a call for consensus to see if there are any objections to publishing the Media Capture API as a FPWD.
> The draft can be read at:
> http://dev.w3.org/2009/dap/camera/Overview-API.html
> Note that there is no requirement on API FPWDs to be perfect — if they were perfect we'd go straight to LC. They need to be good for broader review, and reasonably feature-complete.
> Where CfCs are concerned, silence is considered to be assent, but positive support is preferred (even if simply with a +1). Please send feedback before next Tuesday (Sept 6) as much as possible.
> Thanks!
> regards, Frederick
> Frederick Hirsch, Nokia
> Co-Chair, W3C DAP Working Group
> [1] http://lists.w3.org/Archives/Public/public-device-apis/2010Sep/att-0007/minutes-2010-09-01.html#item08

Philip Gladstone
Distinguished Engineer
Product Development
Phone: +1 978-ZEN-TOAD (+1 978 936 8623)
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Blog: http://wwwin-blogs.cisco.com/pgladsto/

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Received on Friday, 3 September 2010 14:46:34 UTC

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