29 Sep
2021
29 Sep
'21
5:23 p.m.
Hello everyone,
I'm new to this list and also new to Linux.
I am a PhD student working on a research project with hearing impaired people.
For
our research studies we want to realize different audiological tests
with a virtual acoustic sound system. The program we use for rendering
the virtual acoustics runs in Linux.
In our lab, we have a Fireface
802 sound card from RME. But RME doesn't offer support in Linux and
unfortunately doesn't provide drivers.
I
run the Fireface in ClassCompliant mode and it is connected via USB to
the computer with Ubuntu Studio 20.04 LTS as operating system. Basically
the Fireface works, I can use 8 output channels for my sound playback
via Jack.
But the problem is that I actually want to get playback
from 12 loudspeakers in our loudspeaker circuit. When I start Jack, it
displays 22 output channels, but as I said, only 8 playback channels are
playing sound.
Could this be caused by the snd_usb_audio driver? Or how can I assign the output channels
directly?
About any suggestion for a solution I would be very happy!!!
Best regards,
Sebastian Roth
30 Sep
30 Sep
1:45 a.m.
Hi Sebastian
On Wed, Sep 29, 2021 at 05:23:37PM +0200, Sebastian Roth wrote:
In our lab, we have a Fireface 802 sound card from
RME. But RME doesn't
offer support in Linux and unfortunately doesn't provide drivers.
FYI there is some support for certain RME Firewire-capable interfaces when
connected to a firewire bus: FFADO supports the Fireface 400 and 800 and
there is varied support in ALSA for the 400, 800, UCX, 802 and UFX (the
latter is marked as untested). However, I am not aware of any work being
done on the proprietary USB connectivity to RME devices.
I run the Fireface in ClassCompliant mode and it is
connected via USB to
the computer with Ubuntu Studio 20.04 LTS as operating system. Basically
the Fireface works, I can use 8 output channels for my sound playback via
Jack. But the problem is that I actually want to get playback from 12
loudspeakers in our loudspeaker circuit. When I start Jack, it displays
22 output channels, but as I said, only 8 playback channels are playing
sound.
I recall reading somewhere that the RME devices only provide access to the
first 8 channels when running in USB class compliant mode. I think it was
buried in a manual, but I don't remember which model it might have been for.
It was probably the Fireface 800.
With this in mind it is not all that surprising that you can only use the
first 8 channels. What I am somewhat puzzled about is that jackd is
reporting the presence of 22 channels. Perhaps the device tells the USB
class driver that it has 22 channels but only passes audio to 8.
Could this be caused by the snd_usb_audio driver?
It is most likely a limitation of the Fireface 802. However, if you do
discover a workaround I'm sure there are many people who would be very happy
to know about it. :-)
Regards
jonathan
1:28 p.m.
Hi all
On Thu, Sep 30, 2021 at 09:14:42AM +0930, Jonathan Woithe wrote:
I recall reading somewhere that the RME devices only
provide access to the
first 8 channels when running in USB class compliant mode. I think it was
buried in a manual, but I don't remember which model it might have been for.
It was probably the Fireface 800.
In the interests of correctness, "Fireface 800" should obviously have been
"Fireface UFX". The Fireface 800 doesn't have USB ports. Apologies for
any
confusion.
It's entirely possible that the 8 port limit in USB class compliant mode
applied to older firmware and has been removed in later versions. In that
case the inability to use more than 8 channels must have another cause.
Regards
jonathan
3:42 p.m.
Please post the output of
~$ aplay -L
and
~$ aplay -l
zcx
On 29/09/2021 16:23, Sebastian Roth wrote:
Hello everyone,
I'm new to this list and also new to Linux.
I am a PhD student working on a research project with hearing impaired people.
For
our research studies we want to realize different audiological tests
with a virtual acoustic sound system. The program we use for rendering
the virtual acoustics runs in Linux.
In our lab, we have a Fireface
802 sound card from RME. But RME doesn't offer support in Linux and
unfortunately doesn't provide drivers.
I
run the Fireface in ClassCompliant mode and it is connected via USB to
the computer with Ubuntu Studio 20.04 LTS as operating system. Basically
the Fireface works, I can use 8 output channels for my sound playback
via Jack.
But the problem is that I actually want to get playback
from 12 loudspeakers in our loudspeaker circuit. When I start Jack, it
displays 22 output channels, but as I said, only 8 playback channels are
playing sound.
Could this be caused by the snd_usb_audio driver? Or how can I assign the output channels
directly?
About any suggestion for a solution I would be very happy!!!
Best regards,
Sebastian Roth
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3 comments
3 participants
participants (3)
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Jonathan Woithe -
Sebastian Roth -
zcx