On Tue, 2012-05-08 at 06:07 -0700, David Henningsson wrote: > 2012-05-07 19:09, Tanu Kaskinen skrev: > > On Mon, 2012-05-07 at 13:02 -0700, David Henningsson wrote: > >> Besides, it is not obvious to me what the > >> channel mapping should be either, and couldn't that vary between > >> different 4-channel hardware? Is the aux* just causing all inputs to be > >> added for whatever the client wants to have...? > > What do you mean by "added"? Mixed together? No, remixing is disabled > > with aux channels (not sure about mono downmix, though). > > Hmm, so if the source output client requests a stereo stream (left, > right), and all we got is aux0, aux1, aux2 and aux3, what does the > client get in his stream? Silence? I don't know. Possibly. But if that's the case, then the remapping code should be fixed so that when connecting a stereo capture stream to an all-aux source, the first two channels will be used. > > Not having any > > remixing may perhaps cause other problems, but if that's the case, it's > > then a separate bug. I really think the input channel maps should be > > all-aux by default (possibly even with stereo mics, binaural equipment > > being a rare exception), because the channel semantics don't make much > > sense with most input devices (except with PA's monitor sources). > > I disagree. Stereo mic recording in different types of setups is not > that uncommon and should be tagged as such. Line In recording (both > analog and digital) is also set up as left and right. You're right. Especially with line-in the content may often have a specific channel map (e.g. recording music from another device). I think defaulting to "left, right" channel map makes sense for stereo input devices after all. But for more channels I think an all-aux map is still the best. -- Tanu
