Re: [PATCH v4 21/24] paaudio: channel-map option

[Gerd Hoffmann]

  Hi,

> vs surround-50).  IIRC I originally added this feature because USB audio and
> pulseaudio didn't agree about the order of channels, for example in 5.1 pa
> defaults to left,right,rear-left,rear-right,front-center,lfe while USB audio
> expects left,right,center,lfe,rear-left,rear-right order. You can't specify
> this with the well-known names.

Shouldn't backend and frontend be able to negotiate a channel map
without user invention?

Initially, with only usb-audio supporting 5.1/7.1 we can simply declare
the usb-audio channel map as the one which is used.  When other devices
are added some day (hda-surround?) we might need a ctl function so the
frontend can set the channel map (similar to the way volume is handled
today).

cheers,
  Gerd