On Sun, 29 Feb 2004, Florian Schmidt wrote:
>
> Hi,
>
> i wonder if there's a pcm plugin available, that is writeable and also
> readable in a sense that everything that is written to it, will be
> readable again. this could be useful for recording alsa app output if
> the hw does not support capturing the line-out or mix.
>
> Let's call this plugin "redirect" for now.
>
> .asoundrc:
>
> pcm.redirector {
> type redirect
> # we don't need a slave, since this is purely virtual
> }
>
> pcm.mymulti {
> type multi
> # here we combine "redirector" and "hw:0,0" into one device. too lazy
> to look up the syntax
> }
>
> pcm.sniffable {
> type route
> slave.pcm "mymulti"
> slave.channels 4
> ttable.0.0 1
> ttable.1.1 1
> ttable.0.2 1
> ttable.1.3 1
> }
>
> now, when i do
>
> aplay -D plug:sniffable
>
> i should be able to hear the playback and record that stuff by using
>
> arecord -D plug:redirector
>
> I know there exists the file plugin, but i think using a recording app
> for this is more convenient.. Is this possible and is this feasible? and
> did i maybe just miss something in the pcm plugins docs and it already
> works?
It's possible, of course, but nobody has written such plugins yet.
I think that we can reuse some ideas/implementation from direct plugins
(dmix, dshare, dsnoop) here.
Jaroslav
-----
Jaroslav Kysela <[EMAIL PROTECTED]>
Linux Kernel Sound Maintainer
ALSA Project, SuSE Labs
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