Re: Initial draft of mediacapture-output spec posted

The problem with consent is that it's not clear how to clearly indicate
this to the user.

"example.com wants to enumerate your output devices" is not something that
most users will understand, so the implicit authorization mechanism is
likely what most applications will use.

We can figure out the details of explicit consent in
https://github.com/w3c/mediacapture-output/issues/2.

BTW, I updated the document to add the AudioContext ctor option proposed by
Chris.

On Wed, Dec 17, 2014 at 1:25 AM, Philippe Joseph Cohen <philc@audyx.com>
wrote:
>
> Thanks Justin for this update. This is a great step forward. I have few
> questions:
>
>
> In section 4.2 you wrote that:
>
> *The user agent may explicitly obtain user consent to play audio out of
> non-default output devices; the details of this process are left to the
> implementation.*
> I wonder it should not be better to require such consent so to write
> should rather than may. This is mostly because I believe the user consent
> will impact the enumerateDevices method of the NavigatorUserMedia in order
> to set the MediaDeviceInfo.label. In plain english, if in order for an app
> to use the right deviceId (sinkId) in an AudioContext the app should know
> something about the device (based on the label info for example).
>
> Furthermore, shall we not add to the MediaDeviceInfo type fields such as
> sampleRate and numberOfChannels (for distinguishing stereo from 5.1, ...)
> as defined in http://webaudio.github.io/web-audio-api/#idl-def-AudioBuffer,
> based on user consent, so the application will really know which device to
> use.
>
> Last I agree with Chris I guess with most/all the WebAudio API folk that
> an AudioContext constructor with the sinkId is the best solution, since an
> AudioContext cannot really change its output device easily especially if
> they do not have the same sample rate, so it’s good to have the Web Audio
> API specialists such as Chris involved. Having additional audio information
> field in the MediaDeviceInfo will greatly help the app to use the right
> sinkId in the AudioContext ctor.
>
> Best regards - Philippe
>
>
>
>
> On Dec 17, 2014, at 12:49 AM, Justin Uberti <juberti@google.com> wrote:
>
> View it at: https://w3c.github.io/mediacapture-output/
> File issues, submit changes at:
> https://github.com/w3c/mediacapture-output/
>
>
>