On 2011-01-06 11:30, Colin Guthrie wrote: > Hi Alban, > > 'Twas brillig, and Alban Browaeys at 06/01/11 00:32 did gyre and gimble: >> From 853a4d96bf2624ef30f86cf4819382949d039c87 Mon Sep 17 00:00:00 2001 >> From: Alban Browaeys<prahal at yahoo.com> >> Date: Wed, 5 Jan 2011 17:13:04 +0100 >> Subject: [PATCH] Implement Fortemedia SMA processing. >> >> Those small array microphones returns two channels of opposite >> phase thus the default remap in pulseaudio doing the sum output >> silence. > > > Many thanks for this patch, it's very interesting, especially as I've > been helping a couple folk with mics that appear to be 180 deg OOP > recently (although this could be an unrelated issue, see: > https://qa.mandriva.com/show_bug.cgi?id=55930 and > http://blog.moncef-mechri.com/?p=124 to see if you think this is a > similar issue) > > Can you explain how to use the module and what users need to do to make > it work? > > Many thanks. > > Col > FWIW, I think you can solve this on the ALSA level using something like: pcm.micphasefixed { # or your favourite name type route slave.pcm "cards.pcm.default" # might have to change this as well ttable.0.0 1 ttable.1.1 -1 } That's for your .asoundrc. Then we have to route that into pulseaudio somehow as well, preferably in a way that just works for the affected units, via udev/alsa rules or something...don't know the details right now, but I might figure them out some day. (I e these units are not that common, so it might be quite far down on my TODO list - it'll go faster if someone else helps out.) -- David Henningsson, Canonical Ltd. http://launchpad.net/~diwic
