Dne 06. 11. 19 v 12:50 Kai Vehmanen napsal(a):
Hi Jaroslav,
On Tue, 5 Nov 2019, Jaroslav Kysela wrote:
I make some internal ucm code cleanups in alsa-lib and added three
major extensions to allow more complex configurations which we require for the
SOF kernel driver.
looks very good and pragmatic way to tackle some of the issues you hit
with current UCM.
E.g. the If block would be also sufficient to tackle the recent HDMI codec
driver change (with a single UCM file) -- i.e. use existence of the
hdac-hdmi driver controls to select which enable-sequences to run. Hmm, I
like this better than trying to select a whole different UCM file based on
which drivers are used.
And same usage pattern can be applied to other mixer control name changes
(like you already did for the HDA mic control).
That of course leads to the question do we soon need mechanisms to
choose between more than two conditions (e.g. if mixer controls have
changed multiple times in recent kernels, so covering for this
in UCM would need a Switch, If-Else, or similar). But yeah, one can
always define another UCM, so keeping-it-simple might be the right
choice here.
I already implemented the nested If (so you may use another If in the
True/False blocks).
Also 'String' (equal, substring) and 'RegexMatch' conditions were added.
For the substitution, I added ${CardComponents}, too. The driver might pass
another component description strings to the user space for a better
identification - there is snd_component_add() kernel function for this.
I added everything to keep the interface backward compatible, so the
current applications should not observe any different behavior. The
applications like pulseaudio should use the 'hw:CARD_INDEX' specifier for the
open call in the future and snd_use_case_parse_ctl_elem_id() helper for the
element control names.
This sounds good as well. Some testing with common versions of
e.g. Pulseaudio is probably in order to sanity check how this
works.
Yep, I will do more testing.
Do you have any progress with the pulseaudio volume UCM extension? Could you
send me a link to the repository again? Thank you.
Jaroslav
Br, Kai
--
Jaroslav Kysela <perex@xxxxxxxx>
Linux Sound Maintainer; ALSA Project; Red Hat, Inc.
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