[linux-audio-dev] Please help: 16-channel recording w/ LAYLA, ALSA, JACK, ARDOUR

[Lee Revell]

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
}