Re: Future of SourceType - Call For Consensus?

On Sun, Jul 6, 2014 at 1:44 PM, Harald Alvestrand <harald@alvestrand.no>
wrote:

>  On 07/06/2014 09:52 PM, Eric Rescorla wrote:
>
> Yeah, I'm not enthusiastic about this. I'm sensitive to your point about
> unused extension points, but seeing as we know we want to do screen
> capture, I suggest we just take the opportunity to get that right now.
>
>
> One of the things we've talked about for a long time, but don't have, is a
> (short) extension spec that says "here's how we do screen capture".
>
> We know the security section of this needs careful writing, but it might
> be simpler to get a spec out that shows the rest of the stuff - including
> the use of SourceTypeEnum as a choice mechanism.
> I think the Depth spec does a fairly good job of showing that the spec is
> open to extension via more media types, without turning into a dependency
> for getusermedia-1.0; a screen capture spec could do the same thing for
> SourceType.
>
> (Because of the issue with enums that we discovered with FacingMode, it
> has to be cast to a DOMString in the constraints API, but that's a
> different topic.)
>
> Can you think of a way to get someone to volunteer to write such a spec?
>

https://github.com/fluffy/w3c-screen-share

-Ekr


>
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>  -Ekr
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> On Fri, Jul 4, 2014 at 1:01 AM, Harald Alvestrand <harald@alvestrand.no>
> wrote:
>
>> At the moment, we have 3 bugs that touch on SourceType, listed here:
>>
>>
>> https://www.w3.org/Bugs/Public/buglist.cgi?quicksearch=sourcetype&list_id=40270
>>
>> Reminder: SourceType is this enum:
>>
>> enum SourceTypeEnum {
>>     "none",
>>     "camera",
>>     "microphone"
>> };
>>
>> At the moment, we have no part of the spec that depends on this - the
>> only thing you can do with it is to read the attribute on a track, and ask
>> for specific types via a constraint (which is useless for "none", and only
>> has a single possible value for video and audio tracks).
>>
>> It's been suggested as a future extension point (such as specifying "I
>> want a screen capture"), but experience with future extension points is
>> that it's very easy to get them wrong unless you already know the extension
>> you want when you design them.
>>
>> We've had very little comment on the bugs so far - so I'm trying for a
>> call on the list:
>>
>> ***Proposal: SourceType should be removed from getusermedia version
>> 1.0.***
>>
>> If we don't hear anyone arguing in favour of keeping it for a week (July
>> 11), we'll take that as permission to remove (there's always the
>> possibility to reinstate).
>>
>> If we get arguments ..... we'll take it from there.
>>
>>        Harald, chair hat on
>>
>>
>>
>>
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>