[pulseaudio-discuss] [UCM] usage howto

Arun Raghavan arun.raghavan at collabora.co.uk
Tue Jan 8 20:29:18 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]. But then I hit the assertation in file 
> src/modules/alsa/alsa-ucm.c function ucm_get_device_property:250
>      pa_assert(device->playback_channels || device->capture_channels);
> I assume that this is the result of some missing entries in the UCM 
> config, but I can't see my issue.

I'm given to understand that every device must have PlaybackChannels or
CaptureChannels defined.

-- Arun

More information about the pulseaudio-discuss mailing list