[pulseaudio-discuss] [PATCH] Implement Fortemedia SMA processing.

Alban Browaeys prahal at yahoo.com
Fri Jan 14 12:56:43 PST 2011

Le jeudi 06 janvier 2011 à 10:30 +0000, Colin Guthrie a écrit :
> 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)

Most likely yes . Acer uses fortemedia in quite many of its models (I
have an acer ferrari one 200).

> Can you explain how to use the module and what users need to do to make
> it work?

Currently one have to explicitely add:
load-module module-fmaudiosma
to /etc/pulse/default.pa
restart pulse. (or one could use pacmd to load the module).

Then I uses gnome-control-center 3 sound panel and in input tab select
"FMAudio SMA Source <name of input stereo>"
Same could be achieved via pavucontrol.

That s it. I hope it could be improved. Ie for example the choice does
not remains through sessions. That is the most annoying issue at this
stage. Any requests (and clues as to how to implement them) welcomed !

PS: any tweak to make the small array of microphones work somewhat
applied by hand should be reverted . The most common fix used was to
"mute" one of the channel of the stereo input. This is not critical

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