Fwd: draft proposal : active multiple devices for getUserMedia

On Fri, Apr 13, 2012 at 9:47 PM, Harald Alvestrand <harald@alvestrand.no>wrote:

> **
> On 04/12/2012 04:53 AM, William Lin wrote:
>
> Hi,
>
> in these days, Constraints and Capabilities API for getUserMedia were
> discussed while i found one scenario doesn't be covered:
> "users may want to initiate capture from multiple devices at one time in
> multiple media streams" (refer to
> http://www.w3.org/TR/capture-scenarios/#multiple-active-devices).
> is it possible adding the options to set the number of active devices? and
> the callback function needs to change:
>
> Given that the normal case will be one device, what's the cost of this
> relative to "just" calling getUserMedia multiple times?
>

Seems it is one mean to  get 'all' devices. but suppose getUserMedia will
be applied to 'monitor system', it is more sensible just calling one time.


> And how do you see the user interaction dialog looking?
>
>
in my opinion, it is depended on UA implementation: a list/checkgroup is ok
(If native platform application can support user interaction in the
multiple devices case, web runtime application will do).

--william