[alsa-devel] [PATCH 0/3] alsa-lib: UCM - Use Case Manager
perex at perex.cz
Wed Aug 25 10:28:14 CEST 2010
On Tue, 24 Aug 2010, Liam Girdwood wrote:
> On Mon, 2010-08-23 at 19:47 +0200, Jaroslav Kysela wrote:
>> Unfortunately, I have many ideas to improve the API before I can approve
>> or recommend the inclusion to the alsa-lib's tree.
> I wish you had shared your API ideas with us at the time of the RFC. A
> lot of time and effort has since went into UCM development :-/
I too. My big problem is the lack of time.
I tried to rethink the API to be more universal for future extensions (but
the implementation will not dramatically change and the mechanisms you
want to expose are not touched at all). I just wanted to add the
possibility to create the virtual cards combining resources from any
PCM/control/mixer device available in system. The proper device evaluation
and mixer control assignments is something which is wanted by PulseAudio
My proposed header file with reduced function set but not reduced
functionality is available at:
The syntax of your proposed files is very close to the other alsa-lib's
syntax. For example:
Name "Capture Voice"
Can be written in alsa-lib's syntax:
SectionModifier."Capture Voice" [
So I'm thinking to recode all parsers to use the alsa-lib configuration
parsers. As bonus, the alsa-lib configuration routines give us some
runtime evaluation and possibility to reference (include) other files.
Next step may be to support the 'amixer' like syntax for the control and
mixer element handling.
Jaroslav Kysela <perex at perex.cz>
Linux Kernel Sound Maintainer
ALSA Project, Red Hat, Inc.
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