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The Linux sound system ALSA has a mechanism by which the output
of one program can be sent to the input of another program.
It is similar to VAC (virtual audio cable) under Windows.
By installing snd-aloop one will get virtual soundcards
that can be opened as the output of one program and as the
input of another program.
Unfortunately this feature is not (yet?) enabled in the
standard distributions.
This page describes how to install snd-aloop under Debian and Ubuntu. Install under Debian squeeze or sid with the kernel 2.6.32-5-686 (December 2010.)Log into your system ar root.Install the package alsa-source apt-get install alsa-source Go to the /usr/src directory cd /usr/src Unpack the alsa source tarball tar xvfj alsa-driver.tar.bz2 Install the linux headers apt-get install linux-headers-2.6.32-5-common apt-get install linux-headers-2.6.32-5-686 Descend into the the alsa source three cd /usr/src/modules/alsa-driver Configure alsa-source to build all or if you know what you want, selet only what you need. (all is the default so you can skip this step. dpkg-reconfigure alsa-source Produce the new alsa package fakeroot debian/rules binary_modules KSRC=/usr/src/linux-headers-2.6.32-5-686 KVERS=2.6.32-5-686 Install the new alsa package dpkg --install /usr/src/modules/alsa-modules-2.6.32-5-686_1.0.23+dfsg-2_i386.deb Install under Ubuntu.sudo add-apt-repository ppa:ubuntu-audio-dev/ppasudo apt-get update sudo apt-get install linux-alsa-driver-modules-$(uname -r) This procedure installs the latest alsa version 1.0.23 (December 2010) with the snd-aloop driver under Ubuntu 10.04 and Ubuntu 10.10 Make sure the snd-aloop.ko module is loaded at boot time.Edit or create a file /etc/modprobe.d/alsa-base.conf At the very end of the file add something like the following linesoptions snd_xxxxxxx index=0 options snd_yyyyyyy index=1 options snd_aloop index=2 See the file z_ALSA.txt in the linrad package. Edit the file /etc/rc.local and add a line modprobe snd-aloop reboot your system SM 5 BSZ Home page Linrad home page |