Define the windowAudio option

[eladalon1983]

Fixes w3c/mediacapture-screen-share-extensions#7.

CC @o1ka, @jan-ivar, @youennf

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Preview | Diff

[jan-ivar]

Sounds reasonable to me.

[kvrban]

I run a platform for live streaming of games. (similar to twitch) and use webrtc / getDisplayMedia for this.
So far the limitation is that the user has the possibility to select a separate window which he wants to share, but then without sound. Or he shares the entire screen content + the entire system sound.

Do I understand correctly that with the windowAudio option it will be possible to share a separate window + the sound from only this window? That would be ideal and exactly what a user expects.

[eladalon1983]

Do I understand correctly that with the windowAudio option it will be possible to share a separate window + the sound from only this window?

Sorry, you appear to have misunderstood this PR. Here we deal with the spec. It is already possible for users to share a window+audio - per the spec. That various browsers don't offer that capability in practice is a separate issue, to be discussed on those browsers' specific bug trackers.