[pulseaudio-discuss] [UCM] usage howto

Tanu Kaskinen tanuk at iki.fi
Sat Jan 12 10:48:46 PST 2013

On Mon, 2013-01-07 at 11:46 +0100, Soeren Grunewald wrote:
> Hi All,
> I've been testing pulseaudio-3.0 and now I have some questions. Is there 
> any updated documentation available describing the usage of UCM in 
> pulsaudio and can the current UCM implementation handle multiple 
> soundcards? I plan to use two or three soundcards (all having there own 
> UCM configuration) and I'd like to use them with "module-loopback".
> During testing I also run into some issues. With my current 
> configuration [1], I get a double-free, due missing modifiers. I solved 
> this with the attached patch [2].

The patch is not necessary. Alsa-lib 1.0.26 contains a fix[1] that makes
it safe to call snd_use_case_free_list() even if with an empty list
(i.e. NULL).

[1] http://git.alsa-project.org/?p=alsa-lib.git;a=commitdiff;h=e16a9a04b190c1c7981d9c65c08c504b9a23fe37


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