LFS Alsa
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[edit] Description
The ALSA sound driver is the standard sound driver in all modern distributions and in the kernel since 2.6.
[edit] Installation
The installation of ALSA consists of four steps. If only the driver itself is needed, some steps can be omitted.
[edit] The ALSA driver
cd $SOURCEDIR
tar xvfj alsa-driver-<VERSION>.tar.bz2
cd alsa-driver-<VERSION>
./configure \
--with-moddir=/lib/modules/`uname -r`/kernel/drivers/sound \
--with-kernel=/lib/modules/`uname -r`/build \
--with-sequencer=yes \
--with-oss=yes \
--with-isapnp=no \
--with-cards=all
make
make install
If DevFS is not used on the system, the devices have to be created with
./snddevices
Some lines have to be added to the /etc/modules.conf with
cat >> /etc/modules.conf << "EOF" alias char-major-14 soundcore alias char-major-116 snd alias snd-card-0 snd-[soundcard-name] alias sound-slot-0 snd-card-0 alias sound-service-0-0 snd-mixer-oss alias sound-service-0-1 snd-seq-oss alias sound-service-0-3 snd-pcm-oss alias sound-service-0-8 snd-seq-midi EOF depmod -a
[edit] The ALSA library
cd $SOURCEDIR tar xvfj alsa-lib-<VERSION>.tar.bz2 cd alsa-lib-<VERSION> ./configure --enable-static make make install
[edit] The ALSA utilities
cd $SOURCEDIR tar jxvf alsa-utils-<VERSION>.tar.bz2 cd alsa-utils-<VERSION> ./configure make make install
[edit] The ALSA boot scripts
ALSA can be started throught start scripts of the system
The following script /etc/rc.d/init.d/alsa is part of the BLFS (Beyond Linux From Scratch). One can use the whole script, but that is unnecessary bloat for a VDR system.
#!/bin/sh
# Begin $rc_base/init.d/alsa
# Based on sysklogd script from LFS-3.1 and earlier.
# Rewritten by Gerard Beekmans - gerard@linuxfromscratch.org
# ALSA specific parts by Mark Hymers - markh@linuxfromscratch.org
# Stores mixer settings in the default location: /etc/asound.state
. /etc/sysconfig/rc
. $rc_functions
case "$1" in
start)
echo "Starting ALSA... Restoring volumes..."
loadproc /usr/sbin/alsactl restore
#echo " Loading MIDI font..."
#loadproc sfxload /path/to/soundfont
;;
stop)
echo "Stopping ALSA... Saving volumes..."
loadproc /usr/sbin/alsactl store
#echo " Removing MIDI font..."
#loadproc sfxload -i
;;
restart)
$0 stop
sleep 1
$0 start
;;
*)
echo "Usage: $0 {start|stop|restart}"
exit 1
;;
esac
# End $rc_base/init.d/alsa
The start and stop links for the runlevels has to be set, links for unneeded runlevels can be omitted
ln -sf /etc/rc.d/init.d/alsa /etc/rc.d/rc0.d/K35alsa ln -sf /etc/rc.d/init.d/alsa /etc/rc.d/rc1.d/K35alsa ln -sf /etc/rc.d/init.d/alsa /etc/rc.d/rc2.d/S40alsa ln -sf /etc/rc.d/init.d/alsa /etc/rc.d/rc3.d/S40alsa ln -sf /etc/rc.d/init.d/alsa /etc/rc.d/rc4.d/S40alsa ln -sf /etc/rc.d/init.d/alsa /etc/rc.d/rc5.d/S40alsa ln -sf /etc/rc.d/init.d/alsa /etc/rc.d/rc6.d/K35alsa
[edit] The first start
touch /etc/asound.state /etc/rc.d/init.d/alsa start amixer Line 28 on amixer CD 28 on alsactl store
[edit] Links
| [1] | http://www.alsa-project.org/download.php | ALSA Homepage |
