Talk:ALSA - Revision history

SamuelM at 09:37, 2 December 2009

2009-12-02T09:37:50Z

SamuelM at 13:57, 28 November 2009

2009-11-28T13:57:43Z

SamuelM: Use audio devices as non-root user

2009-11-28T13:47:26Z

Use audio devices as non-root user

New page

= Use audio devices as non-root user =

# Create a group that will get permission on the audio device
# Add the non-root user in this group.
# Give permission to this group at boot time.

To do this, run the following command as root on your APF.
Don't forget to adjust the ''u'' and ''g'' variables!

{{Warning| If you already have a script loading the ALSA module at boot time and called '''''S60alsa''''', it '''will be overwritten''' by this script.}}

<pre class="apf">
u=gest # the non-root username
g=audio # the group that will get permissions on the resources

# Create the new group:
addgroup $g

# Add the non-root user to the group:
l=`grep $g /etc/group`
ug=`echo $l | awk -F : '{print $4}'`
sed "
/$l/ c\
$l`! [ $ug ] || echo ,`$u
" /etc/group > /etc/group

# Give permission to the group at boot time:
cat <<eof >/etc/init.d/S60alsa
#!/bin/sh

# The spi_imx module does not seem to be required by the ALSA one.
modprobe snd-imx-alsa-tsc2102

# wait for the creation of all nodes
sleep 2

# give permissions of the sound device to the audio group
chown root:audio /dev/snd/*
eof
</pre>

After reboot, you should be able to play audio file as ''gest'' user.

@@ Line 23: / Line 23: @@
 /$l/ c\
 $l`! [ $ug ] || echo ,`$u
-" /etc/group > /etc/group
+" /etc/group > /etc/group.tmp
 # Give permission to the group at boot time:

@@ Line 2: / Line 2: @@
 # Create a group that will get permission on the audio device
-# Add the non-root user in this group.
+# Add the non-root user to this group.
 # Give permission to this group at boot time.
@@ Line 11: / Line 11: @@
 <pre class="apf">
-u=gest       # the non-root username
+u=guest      # the non-root username
 g=audio      # the group that will get permissions on the resources
@@ Line 28: / Line 28: @@
 cat <<eof >/etc/init.d/S60alsa
 #!/bin/sh
 # The spi_imx module does not seem to be required by the ALSA one.
 modprobe snd-imx-alsa-tsc2102
 # wait for the creation of all nodes
 sleep 2
 # give permissions of the sound device to the audio group
 chown root:audio /dev/snd/*
 eof
 </pre>
-After reboot, you should be able to play audio file as ''gest'' user.
+After reboot, you should be able to play audio files as ''guest'' user.