Hi All,
I have referred to the document on the WiKi at
http://www.alsa-project.org/main/index.php/Matrix%3aModule-dummy, but I require
some additional help, as I am a bit of a noob at all of this.
I am looking to get a Dummy Audio device working on the Raspberry Pi running
Raspian (which is based on Debian). The Raspberry Pi only has an analogue audio
output as standard; however, I require a specific application that requires
both audio input and output (PJSIP), even though for my instance we will not be
using the input.
From the WiKi page above, I can run the following command which sets up a Dummy
sound device and is enough to get PJSIP working:
sudo modprobe snd-dummy
I’m not sure what the other commands do (modprobe snd-pcm-oss ; modprobe
snd-mixer-oss ; modprobe snd-seq-oss) but as far as I can see, I do not need
them. Once the above command is run, I can see a new card list in the
‘/proc/asound/cards’ file such that it shows:
0 [ALSA ]: BRCM bcm2835 ALSbcm2835 ALSA - bcm2835 ALSA
bcm2835 ALSA
1 [Dummy ]: Dummy - Dummy
Dummy 1
However, I come unstuck when I reboot and the sound card disappears. In the
WiKi, you refer to editing the /etc/modules.conf file, however both this and
the other file referenced (/etc/conf.modules) do not exist in this
distribution. There is a Note section that refers to Debian, but again the
folder reference (/etc/modutils/) does not exist. In fact, the application
modutils does not exist and trying to install it using:
sudo apt-get install modutils
Results in the following error:
Package modutils is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
I can see that in this distribution the kernel module soundcore has indeed been
renamed to snd, and I can create a symbolic link to the file using:
sudo ln -s /lib/modules/3.10.25+/kernel/sound/core/snd.ko
/lib/modules/3.10.25+/kernel/sound/soundcore.ko
But there is no such application called update-modules
I have created a file called /etc/modules.conf and put in the following text,
but of course this doe nothing and on reboot the card still disappears.
# OSS/Free portion - card #1
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-oss
alias sound-service-0-12 snd-pcm-oss
So, what can I do? Any help would be very much appreciated.
One other point, there is a link in the WiKi that is supposed to point some
instructions about copy to the text into the module.conf file (just over half
way down), however, the link is broken. I assume it’s just linking to some
instruction about using something like nano, but it might still be worth fixing
for future reference.
Regards,
Chris
------------------------------------------------------------------------------
CenturyLink Cloud: The Leader in Enterprise Cloud Services.
Learn Why More Businesses Are Choosing CenturyLink Cloud For
Critical Workloads, Development Environments & Everything In Between.
Get a Quote or Start a Free Trial Today.
http://pubads.g.doubleclick.net/gampad/clk?id=119420431&iu=/4140/ostg.clktrk
_______________________________________________
Alsa-user mailing list
Alsa-user@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/alsa-user
