Re: [Alsa-user] How to get a list of pcm devices

[Mario R. <mar...@go...>]

For instance, to use pcm.tee, one has to write

aplay -D pcm.tee:"slave_pcm_name,file_name" some_file.wav

while

aplay -D pcm.tee some_file.wav

does not work.
So if one wants to give the user a list of valid plugins, "pcm.tee" is not good.

cheers

pcm.tee {
	@args [ SLAVE FILE FORMAT ]
	@args.SLAVE {
		type string
	}
	@args.FILE {
		type string
	}
	@args.FORMAT {
		type string
		default raw
	}
	type file
	slave.pcm $SLAVE
	file $FILE
	format $FORMAT
}


On 9/16/06, Lee Revell <rlr...@jo...> wrote:
> On Sat, 2006-09-16 at 10:38 +0100, Mario Rossi wrote:
> > Hi,
> >
> > I was wondering whether there is a function to get the list of pcm devices?
> > It would be a list which the user could choose from.
> >
> > I've seen that if you run "aplay -L" you get it, but many of those pcm
> > devices need arguments.
> >
> > aplay -L just calls snd_config_search(..., "pcm", ...). Is there a way
> > to get a restricted list of just the actual devices that can be used
> > without arguments?
>
> It's a known issue that ALSA has no usable device enumeration API.  As
> far as I know no one is working on solving it.
>
> What exactly do you mean by "PCM devices need arguments"?
>
> Lee
>
>