On Tue, 2014-03-04 at 15:34 +0100, David Henningsson wrote: > The recent question about ufx1604 had me thinking if there is an easier > way to deal with multichannel devices for all devices, not only firewire. > > And here's the idea: > > Let's add another key to profile-sets, let's call it > "allow-extra-channels" or something. If that key is set, we're allowed > to use more channels than specified in the channel map. > > The extra channels gets filled up with aux0, aux1 and so on. (Possibly > skipping over aux channels already in the map.) > > For our alsa-lib interface, this means that if the key is set, we'll > call snd_pcm_hw_params_set_channels_min and > snd_pcm_hw_params_set_channels_near instead of > snd_pcm_hw_params_set_channels. > > In default.conf, we would then set this key only on the one that already > exposes maximum number of channels, which in practice means > analog-surround-71 for output and analog-4-channel-input for input. > > Does this make sense? Sounds good to me. -- Tanu
