[pulseaudio-discuss] [UCM] usage howto

Soeren Grunewald soeren.grunewald at avionic-design.de
Wed Jan 9 03:35:27 PST 2013

On 01/09/2013 05:29 AM, Arun Raghavan wrote:
> 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

Thank you for your comment. Tanu already told me that on IRC, he also 
told me that there is already a bug [1] opened for this issue.

[1] https://bugs.freedesktop.org/show_bug.cgi?id=53036

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