Re: AudioContext.maxChannelCount

The last time maxChannelCount and multichannel output came up, I suggested
that AudioDestinationNode should default channelCountMode to 'max' instead
of 'explicit', so many users of Web Audio would not need to use
maxChannelCount at all --- they could just produce as many channels as they
want, and the Web Audio implementation would downmix (or upmix) to the
actual speaker configuration. (Especially convenient when the speaker
configuration changes over time.) I don't recall any replies to that
suggestion. I still like it :-).

If we do that, it's still useful to expose maxChannelCount on
AudioDestinationNode --- it lets advanced users customize the audio graph
to the number of speakers. However, I don't think we need maxChannelCount
on MediaStreamDestinationAudioNode. What would it even mean? I don't think
we can detect the number of speakers a MediaStream is feeding into --- it
could be feeding into many sinks, or none, or into a sink like a
MediaRecorder that can handle any number of channels equally well.

Rob
-- 
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