On Sat, Aug 26, 2023 at 4:28 AM Jaroslav Kysela <perex@xxxxxxxx> wrote: > > On 24. 08. 23 23:33, cujomalainey@xxxxxxxxxxxx wrote: > > From: Curtis Malainey <cujomalainey@xxxxxxxxxxxx> > > > > Sometimes userspace may want to use a reference channel to cancel echos > > when using video chat, this value identifies the device which carries > > that channel. > > The UCM modifier should be used for this - see "Echo Reference" comments in > use-case.h. > > Note that this allows additional setup (in Sequences) for this stream. > > Jaroslav I was under the impression modifiers were state manipulators that acted upon existing devices/pcms and did not designate their own PCM. That is at least how we use them in CRAS. Are there any examples of how to designate a PCM? I don't see any modifiers at all in ucm-conf repo. Curtis > > -- > Jaroslav Kysela <perex@xxxxxxxx> > Linux Sound Maintainer; ALSA Project; Red Hat, Inc. >
