a while ago, someone asked this:
> > Please excuse my ignorant. But is there such thing as "software mixing" ?
> > Basically, what I want is for the soundcard to be used by more than one
> > source....
and lee answered:
> Yes, ALSA supports software mixing for cards that can't do it in
> hardware.
i have a couple of follow-on questions on how this works. for
completeness, i'm running 1.0.10, from debian testing (etch),
though it seems that the drivers may be older:
# aplay --version
aplay: version 1.0.10 by Jaroslav Kysela <[EMAIL PROTECTED]>
# cat /proc/asound/version
Advanced Linux Sound Architecture Driver Version 1.0.9rc2 (Thu Mar 24
10:33:39 2005 UTC).
- does alsa make an effort to use the h/w mixer(s) first, and
only then resort to s/w mixing?
- what sort of configuration is necessary to make this work?
i see that
http://www.alsa-project.org/alsa-doc/doc-php/asoundrc.php#softmix
talks about configuring dmix. do i need to do anything
explicit as described on that page? i've gotten the
impression from answers given here on the list that
software mixing "just works".
(i confess that i find the contents of alsa.conf fairly
unintelligible. :-)
- if i'm using the OSS compatibility layer, will OSS input be
software-mixed if necessary as well as "native" alsa
input? or do i need to make sure all of my sound apps
are alsa-aware?
- if alsa is choosing how to do the mixing, how can one
control the relative levels of the two (or more) audio
sources? only h/w mixing channels will show up in a
mixer app, correct, so how would one control a software
mix?
- is it possible to configure an input source (call it A) so
that it automatically mutes another source (call it B)
when A becomes active? for instance, when my caller-id
audio announcement takes place, i'd like the music to
mute while that happens.
thanks!
paul
=---------------------
paul fox, [EMAIL PROTECTED] (arlington, ma, where it's 30.2 degrees)
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