[mediacapture-main] MediaTrackSettings lacks support of channel layout (#605)

henrikand has just created a new issue for https://github.com/w3c/mediacapture-main:

== MediaTrackSettings lacks support of channel layout ==
Current specification supports channelCount 

https://rawgit.com/w3c/mediacapture-main/master/getusermedia.html#def-constraint-channelCount 

but this is not sufficient when the track contains more than two channels. In those cases, a channelLayout is also required [1].

[1] https://en.wikipedia.org/wiki/Surround_sound

Please view or discuss this issue at https://github.com/w3c/mediacapture-main/issues/605 using your GitHub account