[pulseaudio-discuss] [RFC] Alsa UCM integration.

Margarita Olaya magi.oc at gmail.com
Tue Feb 8 08:16:02 PST 2011

Hi Pierre,

On Mon, Feb 7, 2011 at 9:05 PM, pl bossart <bossart.nospam at gmail.com> wrote:
> Hi Margarita,
>> I've created some code that can read this data out of UCM in module
>> alsa-card but I'm now looking for the best way to store this into the
>> prop list for the sound card. e.g. should I extend intended roles
>> proplist or add new proplist types for UCM.
> As I wrote in my comments on alsa-devel, I don't think it's right to
> read UCM properties in module-alsa-card. For virtual cards, eg. a USB
> headphone and a USB microphone, you will have 2 cards part used for
> the same verb. It'd be weird to store UCM values twice. In addition,
> somehow we have to reconcile the static list of cards/devices in UCM
> configurations with the way PulseAudio detects hardware.
> I would think UCM information should be stored in a core proplist by a
> standalone module that runs on startup (before module-udev-detect),
> and when a card is detected with udev events you can identify in
> module-alsa-card which configuration to use. Only then can you set the
> UCM verb/devices for that specific card based on the role indicated by
> clients.

After a little investigation I now agree that a new module is the best
method to support the virtual card. I 'll try to have and initial
patch ready soon and then I'll post the url for the branch.


> -Pierre
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