11 Apr
2006
11 Apr
'06
7:04 p.m.
I bought a Layla24 and Cardbus adaptor. Works beatifully with ALSA/JACK/ARDOUR up to 8
channels. However, the soundcard presents the 8 analog channels as device 0 and 8 digital
channels as device 1. JACK will only open one device at a time. So in order to record
and play back 16 channels with Ardour, I apparently need to create a virtual ALSA device
combining the two LAYLA subdevices.
Which brings me back to a place I always find myself when working with new sound gear -
ALSA LIMBO, a dark claustrophobic space occupied only by unidentified .asoundrc fragments,
paved with device anomolies, mined with disinformation bomblets, seen through the funhouse
mirrors of fruitless google sessions. Cascades of similar plugin types of indeterminate
direction, each encased in the next like a 12-step turducken, translated through an
inconsistent mix of multiple (equivalent?) syntaxes, with the smallest deviation producing
a cryptic failure. A breadcrumb trail of trials and errors spirals back further than I can
see, and the only sounds I can hear over the queasy rumblings building in my stomach, is
me repeating to myself that OF COURSE it is possible, I can't be the ONLY person to
try to use all channels with JACK, and if I just dig through another 10 pages of search
results i'll surely find a .asoundrc which solves the whole thing for me.
And then I wake, throat hoarse, sticky with fever sweat, to apply ice to my forehead and
plaster to the fresh hole in my wall. And I beg of you, someone, please, for the love of
all that is holy, just give me the damn answer so i can get on with my life. And not a
"use the multi plugin" answer, because THAT IS NO ANSWER, THAT IS ONLY A TAUNT.
An actual, complete .asoundrc which has actually worked in practice, with .ctl, mmap,
exclusivity, #channels, etc accounted for. The kind which saves me literal hours of very
literal frustration.
Thanks in advance,
-geoff
12 Apr
12 Apr
12:02 a.m.
New subject: [linux-audio-dev] Please help: 16-channel recording w/ LAYLA, ALSA, JACK, ARDOUR
On Tuesday 11 April 2006 07:04 pm, Lance Blisters wrote:
I bought a Layla24 and Cardbus adaptor. Works
beatifully with
ALSA/JACK/ARDOUR up to 8 channels. However, the soundcard presents the 8
analog channels as device 0 and 8 digital channels as device 1. JACK will
only open one device at a time. So in order to record and play back 16
channels with Ardour, I apparently need to create a virtual ALSA device
combining the two LAYLA subdevices.
Which brings me back to a place I always find myself when working with new
sound gear - ALSA LIMBO, a dark claustrophobic space occupied only by
unidentified .asoundrc fragments, paved with device anomolies, mined with
disinformation bomblets, seen through the funhouse mirrors of fruitless
google sessions. Cascades of similar plugin types of indeterminate
direction, each encased in the next like a 12-step turducken, translated
through an inconsistent mix of multiple (equivalent?) syntaxes, with the
smallest deviation producing a cryptic failure. A breadcrumb trail of
trials and errors spirals back further than I can see, and the only sounds
I can hear over the queasy rumblings building in my stomach, is me
repeating to myself that OF COURSE it is possible, I can't be the ONLY
person to try to use all channels with JACK, and if I just dig through
another 10 pages of search results i'll surely find a .asoundrc which
solves the whole thing for me.
And then I wake, throat hoarse, sticky with fever sweat, to apply ice to my
forehead and plaster to the fresh hole in my wall. And I beg of you,
someone, please, for the love of all that is holy, just give me the damn
answer so i can get on with my life. And not a "use the multi plugin"
answer, because THAT IS NO ANSWER, THAT IS ONLY A TAUNT. An actual,
complete .asoundrc which has actually worked in practice, with .ctl, mmap,
exclusivity, #channels, etc accounted for. The kind which saves me literal
hours of very literal frustration.
Thanks in advance,
-geoff
I hate when that happens!
1:17 a.m.
New subject: [linux-audio-dev] Please help: 16-channel recording w/ LAYLA, ALSA, JACK, ARDOUR
On Tue, 2006-04-11 at 16:04 -0700, Lance Blisters wrote:
I bought a Layla24 and Cardbus adaptor. Works
beatifully with ALSA/JACK/ARDOUR up to 8 channels. However, the soundcard presents the 8
analog channels as device 0 and 8 digital channels as device 1. JACK will only open one
device at a time. So in order to record and play back 16 channels with Ardour, I
apparently need to create a virtual ALSA device combining the two LAYLA subdevices.
Well, you certainly should have asked about it before getting this
upset...
So both devices are 8 channels full duplex?
Lee
1:17 a.m.
New subject: [linux-audio-dev] Please help: 16-channel recording w/ LAYLA, ALSA, JACK, ARDOUR
On Tue, 2006-04-11 at 16:04 -0700, Lance Blisters wrote:
I bought a Layla24 and Cardbus adaptor. Works
beatifully with ALSA/JACK/ARDOUR up to 8 channels. However, the soundcard presents the 8
analog channels as device 0 and 8 digital channels as device 1. JACK will only open one
device at a time. So in order to record and play back 16 channels with Ardour, I
apparently need to create a virtual ALSA device combining the two LAYLA subdevices.
Does this work? (based on
http://www.sound-man.co.uk/linuxaudio/ice1712multi.html)
# .asoundrc for layla
#
# Create virtual devices out of multiple subdevices
# JACK will need MMAP_COMPLEX support to use this.
pcm.multi_capture {
type multi
slaves.a.pcm hw:0,0
slaves.a.channels 8
slaves.b.pcm hw:0,1
slaves.b.channels 8
# First 8 channels of first soundcard (capture)
bindings.0.slave a
bindings.0.channel 0
bindings.1.slave a
bindings.1.channel 1
bindings.2.slave a
bindings.2.channel 2
bindings.3.slave a
bindings.3.channel 3
bindings.4.slave a
bindings.4.channel 4
bindings.5.slave a
bindings.5.channel 5
bindings.6.slave a
bindings.6.channel 6
bindings.7.slave a
bindings.7.channel 7
# First 8 channels of second soundcard (capture)
bindings.8.slave b
bindings.8.channel 0
bindings.9.slave b
bindings.9.channel 1
bindings.10.slave b
bindings.10.channel 2
bindings.11.slave b
bindings.11.channel 3
bindings.12.slave b
bindings.12.channel 4
bindings.13.slave b
bindings.13.channel 5
bindings.14.slave b
bindings.14.channel 6
bindings.15.slave b
bindings.15.channel 7
}
ctl.multi_capture {
type hw
card 0
}
pcm.multi_playback {
type multi
slaves.a.pcm hw:0,0
slaves.a.channels 8
slaves.b.pcm hw:0,1
slaves.b.channels 8
# First 8 channels of first soundcard (playback)
bindings.0.slave a
bindings.0.channel 0
bindings.1.slave a
bindings.1.channel 1
bindings.2.slave a
bindings.2.channel 2
bindings.3.slave a
bindings.3.channel 3
bindings.4.slave a
bindings.4.channel 4
bindings.5.slave a
bindings.5.channel 5
bindings.6.slave a
bindings.6.channel 6
bindings.7.slave a
bindings.7.channel 7
# First 8 channels of second soundcard (playback)
bindings.8.slave b
bindings.8.channel 0
bindings.9.slave b
bindings.9.channel 1
bindings.10.slave b
bindings.10.channel 2
bindings.11.slave b
bindings.11.channel 3
bindings.12.slave b
bindings.12.channel 4
bindings.13.slave b
bindings.13.channel 5
bindings.14.slave b
bindings.14.channel 6
bindings.15.slave b
bindings.15.channel 7
}
ctl.multi_playback {
type hw
card 0
}
3:03 a.m.
On Wed, Apr 12, 2006 at 01:17:47AM -0400, Lee Revell wrote:
On Tue, 2006-04-11 at 16:04 -0700, Lance Blisters
wrote:
The above line produces the following:
ALSA lib conf.c:1592:(snd_config_load1)_toplevel_:606:27:Unexpected char
ALSA lib conf.c:2837:(snd_config_hook_load)/root/.asoundrc may be old or corrupted
consider to remove or fix it
Character 27 is either the '1' or the newline.
The MMAP_COMPLEX note might be relevant to a dead end i reached earlier. Does anyone know
whether planetccrma builds jack with this option? jackd --help doesn't mention. i
have version jackd 0.100.6.
Thanks for the assistance.
-geoff
I bought a Layla24 and Cardbus adaptor. Works
beatifully with ALSA/JACK/ARDOUR up to 8 channels. However, the soundcard presents the 8
analog channels as device 0 and 8 digital channels as device 1. JACK will only open one
device at a time. So in order to record and play back 16 channels with Ardour, I
apparently need to create a virtual ALSA device combining the two LAYLA subdevices.
Does this work? (based on
http://www.sound-man.co.uk/linuxaudio/ice1712multi.html)
# .asoundrc for layla
#
# Create virtual devices out of multiple subdevices
# JACK will need MMAP_COMPLEX support to use this.
pcm.multi_capture {
type multi
slaves.a.pcm hw:0,0
slaves.a.channels 8
slaves.b.pcm hw:0,1 
3:13 a.m.
Lance Blisters <geoff(a)hurl.ugcs.caltech.edu>du>:
I bought a Layla24 and Cardbus adaptor. Works
beatifully
with ALSA/JACK/ARDOUR up to 8 channels. However, the
soundcard presents the 8 analog channels as device 0 and 8
digital channels as device 1. JACK will only open one
device at a time. So in order to record and play back 16
channels with Ardour, I apparently need to create a virtual
ALSA device combining the two LAYLA subdevices.
You're probably aware of Giuliano Pochini <pochini(a)shiny.it>
being the author of ALSA's Echo/Layla drivers. He is on
alsa-dev, very helpful and might just know what you need.
--
Wolfgang
6620
days inactive
6621
days old
linux-audio-dev@lists.linuxaudio.org
5 comments
4 participants
participants (4)
-
John Check -
Lance Blisters -
Lee Revell -
Wolfgang Woehl