[alsa-devel] [pulseaudio-discuss] alsa ucm in pulseaudio

Mark Brown broonie at opensource.wolfsonmicro.com
Fri Oct 14 13:35:06 CEST 2011

On Fri, Oct 14, 2011 at 12:00:54PM +0200, David Henningsson wrote:
> On 10/14/2011 11:39 AM, Mark Brown wrote:
> >On Fri, Oct 14, 2011 at 10:57:08AM +0200, David Henningsson wrote:
> >>As for ports, this again depends on what is mutually exclusive and
> >>what could be used in parallel, I vaguely remember "Modifiers" as
> >>something that could be used in parallel with existing streams, if
> >>so, they need to be separate sinks/sources.

> >Modifiers and Devices can both be used concurrently.

> Modifiers, if any? E g, would UCM allow for three active Devices and
> four active Modifiers, all resulting in seven independent PCM
> streams running concurrently? Or are there constraints in that e g
> all Devices and/or Modifiers must share the same PCM stream?

There can be more than one PCM stream but there needn't be a PCM stream
per device (and that would fail to reflect what hardware can actually

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