GRC uses OSS instead of ALSA?

Hi guys,

My application requires that I use a multi-channel audio device as an
audio
source. I have in my system of hardware the Presonus 1818VSL external
USB
device. This audio source is definetely working correctly with Ubuntu
as I
can monitor the level of each channel using Ardour without any
preconfiguration whatsoever.

My problem is that I am having absolutely no luck in trying to establish
a
connection between GRC and my multi-channel sound device (Presonus
1818).
I have uninstalled pulse audio and made the chages to the
/etc/modprobe.d/alsa-base.conf file as per these directions. I know
for
fact that this did work about two months ago, at that time, I was
measuring
each audio input in GRC using a scope sink. It was beautiful and it
worked
fantasticly) http://forums.presonus.com/posts/list/28993.page

Regardless of how my multi-channel audio source is delcared (i.e. blank,
hw:0,0 or plughw:0,0) GRC will always report that the OSS source has no
file or directory. I have read that OSS was discontinued quite some
time
ago. How can I force GRC to use only the ALSA audio source?

I have attached a couple of screen shots showing my very simple
flowgraph
and the ALSA mixer info.

Thanks in advance for any advise to get me rolling in the right
direction.

John

On Mon, Jun 2, 2014 at 12:54 PM, John M. [email protected]
wrote:

I have uninstalled pulse audio and made the chages to the
I have attached a couple of screen shots showing my very simple flowgraph
and the ALSA mixer info.

Thanks in advance for any advise to get me rolling in the right direction.

John

John,

Any chance you’ve reinstalled anything in the meantime since this was
working before? We haven’t (iirc) changed anything in the gr-audio
system
recently. Generally, this is a dependency problem. The gr-audio was
reworked a few years ago, but it’s now less verbose about telling you
what
audio subsystems are and are not being built and installed. Take a look
that libasound2-dev is installed (the’s the Debian/Ubuntu name for the
package). If you don’t have the alsa dev package installed, it won’t be
built. So if that’s the case, install the dev package, then rerun cmake
and
rebuild GNU Radio to try and recover it.

Tom

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