multiple usb soundcards - redFrik/supercolliderStandaloneRPI2 GitHub Wiki
this page describes how to use two cheap generic audio usb cards to get 2 input and 4 output sound channels simultaneously from supercollider.
it is assumed you have supercolliderStandaloneRPI2 installed, have the two usb soundcards connected and is logged in to the pi via ssh.
short version
export DISPLAY=:0.0jackd -P75 -dalsa -dhw:1 -p1024 -n3 -s -r44100 &alsa_in -j "myusbin" -dhw:2 -p1024 -n3 -c1 -r44100 &alsa_out -j "myusbout" -d hw:2 -p1024 -n3 -c2 -r44100 &cd supercolliderStandaloneRPI2./sclang -a -l sclang.yamls.options.numInputBusChannels= 2s.options.numOutputBusChannels= 4s.boot"jack_connect SuperCollider:in_2 myusbin:capture_1 &".unixCmd"jack_connect SuperCollider:out_3 myusbout:playback_1 &".unixCmd"jack_connect SuperCollider:out_4 myusbout:playback_2 &".unixCmda= Pbind(\degree, Pseq([0, 1, 2, 3], inf), \amp, 0.5, \pan, -1, \out, Pseq([0, 1, 2, 3], inf)).playa.stop
long version
same but with additional commands and printouts to show the whole process.
pi@rpi3:~ $ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: ALSA [bcm2835 ALSA], device 0: bcm2835 ALSA [bcm2835 ALSA]
Subdevices: 8/8
Subdevice #0: subdevice #0
Subdevice #1: subdevice #1
Subdevice #2: subdevice #2
Subdevice #3: subdevice #3
Subdevice #4: subdevice #4
Subdevice #5: subdevice #5
Subdevice #6: subdevice #6
Subdevice #7: subdevice #7
card 0: ALSA [bcm2835 ALSA], device 1: bcm2835 ALSA [bcm2835 IEC958/HDMI]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: Device [Generic USB Audio Device], device 0: USB Audio [USB Audio]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 2: Device_1 [Generic USB Audio Device], device 0: USB Audio [USB Audio]
Subdevices: 1/1
Subdevice #0: subdevice #0
pi@rpi3:~ $ export DISPLAY=:0.0
pi@rpi3:~ $ jackd -P75 -dalsa -dhw:1 -p1024 -n3 -s -r44100 &
[1] 1117
pi@rpi3:~ $ jackdmp 1.9.10
Copyright 2001-2005 Paul Davis and others.
Copyright 2004-2014 Grame.
jackdmp comes with ABSOLUTELY NO WARRANTY
This is free software, and you are welcome to redistribute it
under certain conditions; see the file COPYING for details
JACK server starting in realtime mode with priority 75
self-connect-mode is "Don't restrict self connect requests"
audio_reservation_init
Acquire audio card Audio1
creating alsa driver ... hw:1|hw:1|1024|3|44100|0|0|nomon|swmeter|soft-mode|32bit
configuring for 44100Hz, period = 1024 frames (23.2 ms), buffer = 3 periods
ALSA: final selected sample format for capture: 16bit little-endian
ALSA: use 3 periods for capture
ALSA: final selected sample format for playback: 16bit little-endian
ALSA: use 3 periods for playback
pi@rpi3:~ $ alsa_in -j "myusbin" -dhw:2 -p1024 -n3 -c1 -r44100 &
[2] 1151
selected sample format: 16bit
delay = 4009
pi@rpi3:~ $ alsa_out -j "myusbout" -d hw:2 -p1024 -n3 -c2 -r44100 &
[2] 1126
selected sample format: 16bit
pi@rpi3:~ $ jack_lsp
system:capture_1
system:playback_1
system:playback_2
myusbin:capture_1
myusbout:playback_1
myusbout:playback_2
pi@rpi3:~ $ cd supercolliderStandaloneRPI2
pi@rpi3:~/supercolliderStandaloneRPI2 $ ./sclang -a -l sclang.yaml
init_OSC
compiling class library...
initPassOne started
libEGL warning: DRI2: failed to authenticate
NumPrimitives = 728
initPassOne done
compiling dir: './share/system/SCClassLibrary'
compiling dir: './share/system/Extensions'
pass 1 done
numentries = 1202792 / 17545780 = 0.069
5449 method selectors, 3220 classes
method table size 9153048 bytes, big table size 70183120
Number of Symbols 14104
Byte Code Size 414244
compiled 441 files in 1.53 seconds
Info: 4 methods are currently overwritten by extensions. To see which, execute:
MethodOverride.printAll
compile done
Class tree inited in 0.08 seconds
Cleaning up temp synthdefs...
WARNING: Extension in './share/system/SCClassLibrary/Platform/linux/extMIDIOut.sc' overwrites Meta_MIDIClient:externalSources in main class library.
WARNING: Extension in './share/system/SCClassLibrary/Platform/linux/extMIDIOut.sc' overwrites Meta_MIDIClient:externalDestinations in main class library.
WARNING: Extension in './share/system/SCClassLibrary/Platform/linux/extMIDIOut.sc' overwrites Meta_MIDIIn:connectAll in main class library.
Intentional overwrites must be put in a 'SystemOverwrites' subfolder.
*** Welcome to SuperCollider 3.8.0. *** For help type ctrl-c ctrl-h (Emacs) or :SChelp (vim) or ctrl-U (sced/gedit).
sc3> s.options.numInputBusChannels= 2
-> a ServerOptions
sc3> s.options.numOutputBusChannels= 4
-> a ServerOptions
sc3> s.boot
booting 57110
-> localhost
sc3> Found 0 LADSPA plugins
JackDriver: client name is 'SuperCollider'
SC_AudioDriver: sample rate = 44100.000000, driver's block size = 1024
JackDriver: connected system:capture_1 to SuperCollider:in_1
JackDriver: connected SuperCollider:out_1 to system:playback_1
JackDriver: connected SuperCollider:out_2 to system:playback_2
SuperCollider 3 server ready.
JackDriver: max output latency 69.7 ms
Receiving notification messages from server localhost
Resetting recChannels to 4
Shared memory server interface initialized
sc3> "jack_connect SuperCollider:in_2 myusbin:capture_1 &".unixCmd
-> 1353
sc3> RESULT = 0
sc3> "jack_connect SuperCollider:out_3 myusbout:playback_1 &".unixCmd
-> 1359
sc3> RESULT = 0
sc3> "jack_connect SuperCollider:out_4 myusbout:playback_2 &".unixCmd
-> 1364
sc3> RESULT = 0
sc3> a= Pbind(\degree, Pseq([0, 1, 2, 3], inf), \amp, 0.5, \pan, -1, \out, Pseq([0, 1, 2, 3], inf)).play
-> an EventStreamPlayer
sc3> a.stop
-> an EventStreamPlayer
sc3> a= {Pan2.ar(DelayN.ar(SoundIn.ar(0), 2, 2), SinOsc.kr(1))}.play(outbus:0) //in0 to out0+1
-> Synth('temp__0' : 1259)
sc3> a.release
-> Synth('temp__0' : 1259)
sc3> a= {Pan2.ar(DelayN.ar(SoundIn.ar(0), 2, 2), SinOsc.kr(1))}.play(outbus:2) //in0 to out2+3
-> Synth('temp__1' : 1260)
sc3> a.release
-> Synth('temp__1' : 1260)
sc3> a= {Pan2.ar(DelayN.ar(SoundIn.ar(1), 2, 2), SinOsc.kr(1))}.play(outbus:0) //in1 to out0+1
-> Synth('temp__2' : 1261)
sc3> a.release
-> Synth('temp__2' : 1261)
sc3> a= {Pan2.ar(DelayN.ar(SoundIn.ar(1), 2, 2), SinOsc.kr(1))}.play(outbus:2) //in1 to out2+3
-> Synth('temp__3' : 1262)
sc3> a.release
-> Synth('temp__3' : 1262)
sc3>