On Tue, Aug 29, 2023 at 8:37 AM Jaroslav Kysela <perex@xxxxxxxx> wrote: > > > The modifiers may define extra PCM streams in the standard Value section - you > can use CapturePCM value for the modifier like "Echo Reference". Modifiers may > alter the characteristics of the original UCM device stream (using command > sequences), too. Thanks for the clarification, that indeed is where the assumption I think for most of us is not as clear. I would have never thought a modifier would carry a PCM. I will trigger some work internally to convert our value to the modifier syntax. Curtis > > Modifiers are an extra layer on top of devices. I don't think that we have any > default relation between the modifier PCM device and the original PCM device > (from the UCM device definition). A new value to describe this (like > "ReplacePlaybackPCM 1") may be introduced. Another issue is when multiple > modifiers with this description are active - they conflict, so it should be > described somewhere, too. Perhaps, "ConflictingModifier" array may be added to > API. But those extensions are not required for the "Echo Reference" modifier. > > Jaroslav > > -- > Jaroslav Kysela <perex@xxxxxxxx> > Linux Sound Maintainer; ALSA Project; Red Hat, Inc. >
