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papal_authority
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Joined: 31 Mar 2004
Posts: 1823
Location: Canada
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 Posted: Mon Nov 20, 2006 5:32 am Post subject: Setting Up a User to Use a Particular Sound Card |
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Setting Up a User to Use a Particular Sound Card
This deals with a box having multiple sound cards and running ALSA and gstreamer. It shows how to set up a user to use a particular sound card. The information on how to do this seems remarkably well hidden and it took a fair amount of searching and reading old mailing lists. Hopefully this will save someone else some time.
In my situation, I had a box with two SoundBlaster Live! cards and wanted each of the two users to have their own sound card. There's basically two parts, configuring ALSA and configuring gstreamer, which is what most GNOME apps use for their audio. Of course this information can be used to allow different apps to use different cards.
STEP 1 Login as the user you wish to edit.
STEP 2 % cat /proc/asound/cards
- note the number at the beginning of each line returned, we will use those numbers
STEP 3 % vi $HOME/.asoundrc
- create a file like the following (this user is using the second card which is numbered 1)
| Code: | # --------------------------------------------------------
# use the first device on the second sound card as default
# --------------------------------------------------------
pcm.!default {
type hw
card 1
device 0
} |
STEP 4 % aplay /some/wavfile.wav
- this should play through the sound card you chose
STEP 5 % gstreamer-properties
- under "Default Output Plugin", change the "Output" to "Custom"
- change "Pipeline" to: alsasink -device=hw:1
- click "Test", this should play through the second card
STEP 6 % gconftool-2 --type string --set /system/gstreamer/0.10/default/audiosink "alsasink -device=hw:1"
- the generic audio device
STEP 7 % gconftool-2 --type string --set /system/gstreamer/0.10/default/chataudiosink "alsasink -device=hw:1"
- the chat device
STEP 8 % gconftool-2 --type string --set /system/gstreamer/0.10/default/musicaudiosink "alsasink -device=hw:1"
- the music device
STEP 9 % gconftool-2 --type string --set /system/gstreamer/0.8/default/audiosink "alsasink -device=hw:1"
- this one is necessary for rhythmbox which uses gstreamer 0.8
Now you can repeat this for other users, using a different device number (highlighted in red) in steps 3,5,6,7,8 and 9.
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truc
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Joined: 25 Jul 2005
Posts: 3199
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| Posted: Mon Nov 20, 2006 9:54 pm Post subject: |
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Thanks, I've been looking for something like this for a while!
One question though, does the 5, 6, 7, 8 and 9 steps really necessary? cause it just looks like a gnome stuff only ?
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papal_authority
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Joined: 31 Mar 2004
Posts: 1823
Location: Canada
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| Posted: Tue Nov 21, 2006 3:14 am Post subject: |
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| truc wrote: | Thanks, I've been looking for something like this for a while!
One question though, does the 5, 6, 7, 8 and 9 steps really necessary? cause it just looks like a gnome stuff only ? |
Well it's anything that uses GStreamer as a backend for multimedia. Currently most GNOME apps do (e.g. Totem, Rhythmbox and Banshee), but even some big name KDE apps use GStreamer (e.g. JuK, Kaffeine and Amarok*).
*I've heard in the latest release, Amarok does not though.
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monolit
n00b
Joined: 29 Jan 2004
Posts: 64
Location: Paris/Texas
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| Posted: Fri Dec 29, 2006 12:18 am Post subject: |
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Just for your info 
I couldn't get sound from my second soundcard and I did the first four step( step 4 just being a test ). $ gstreamer-properties ( Multimedia Systems Selector from System->Preferences menu for Gnome ) was set to Autodetect( other controls were set for the heart of the sun and I got sound. I skipped the rest of the list, for at least now
Thanks papal_authority 
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