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script for quick switch between audio interfaces via commandline

Posted: Thu Sep 26, 2019 11:46 pm
by alignwaivers
So I switch so much back and forth between my usb audio interface and my internal soundcard (when I take my laptop elsewhere), it gets a little tedious managing all the settings manually (in cadence) whenever I switch.

A slightly better step would be to create two separate rooms in claudia and switch between loading those. But I'm wondering, is there a way of switching between audio devices in the command line? Haven't had success with this but have put much effort into doing so. Any insights would be greatly appreciated, thanks

p.s. would be fine to use claudia to switch 'rooms' if I could do so from the terminal, but as far as I'm aware this is not a feature and claudia takes no arguments when run in the command line

Re: script for quick switch between audio interfaces via commandline

Posted: Fri Sep 27, 2019 5:47 am
by bluebell
alignwaivers wrote:So I switch so much back and forth between my usb audio interface and my internal soundcard (when I take my laptop elsewhere), it gets a little tedious managing all the settings manually (in cadence) whenever I switch.

A slightly better step would be to create two separate rooms in claudia and switch between loading those. But I'm wondering, is there a way of switching between audio devices in the command line? Haven't had success with this but have put much effort into doing so. Any insights would be greatly appreciated, thanks

p.s. would be fine to use claudia to switch 'rooms' if I could do so from the terminal, but as far as I'm aware this is not a feature and claudia takes no arguments when run in the command line
AFAIK jackd's audio interface can't be changed on the fly. So you have to restart jack, e.g. with a shell script.

Re: script for quick switch between audio interfaces via commandline

Posted: Fri Sep 27, 2019 10:23 am
by Linuxmusician01
I made a shell script for personal use on my various Linux machines. Maybe it's almost what you mean. You can find it here and it looks like this:

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┌─────────────────────────────────────┐
│              Audio menu             │
└─────────────────────────────────────┘
Use ↑ and ↓ keys to select and Enter
to execute.

 Jack audio daemon: start               
                  : kill                
 Check Midi       : port numbers        
                  : output              
 Check Alsa       : device/card numbers 
 Pulseaudio       : start               
                  : stop                
                  : PAVUControl         
 Config file      : create/edit         
                  : delete              
                  : view                
 Help                                  
 Exit                                  

Re: script for quick switch between audio interfaces via commandline

Posted: Mon Oct 14, 2019 11:59 pm
by alignwaivers
That's an awesome script! Thanks for sharing that

Unfortunately I am primarily interested in switching the master instead of restarting jack completely.

Do you know if that might be possible if you change the device based on the config file?





I found a useable solution (thanks to Falktx for pointing me in the right direction)

jack_control dps device "hw:USB,0" #(my audio interface)
jack_control sm

HERE's the new problem. I switch between 2 different USB audio interfaces that BOTH show up as "hw:USB,0"

I hope to find a way to clear / reset jack's memory of the devices so when I plug in the NEW device my script tries to connect to that "hw:USB,0" and ignores the old one.

The only way I know how to do that now is by stopping jack :(

Re: script for quick switch between audio interfaces via commandline

Posted: Tue Oct 15, 2019 12:04 pm
by Linuxmusician01
alignwaivers wrote:That's an awesome script! Thanks for sharing that

Unfortunately I am primarily interested in switching the master instead of restarting jack completely.

Do you know if that might be possible if you change the device based on the config file?





I found a useable solution (thanks to Falktx for pointing me in the right direction)

jack_control dps device "hw:USB,0" #(my audio interface)
jack_control sm

HERE's the new problem. I switch between 2 different USB audio interfaces that BOTH show up as "hw:USB,0"

I hope to find a way to clear / reset jack's memory of the devices so when I plug in the NEW device my script tries to connect to that "hw:USB,0" and ignores the old one.

The only way I know how to do that now is by stopping jack :(
I don't think that I know exactly what you want but I think that it's not possible. One cannot change between audio devices without restarting Jack I think.

You might also try the commands that you already know w/ sound card names instead of sound card numbers. Like for instance:

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cat /proc/asound/cards
 0 [CMI8738        ]: CMI8738-MC6 - C-Media CMI8738
                      C-Media CMI8738 (model 55) at 0xd000, irq 20
 1 [PCH            ]: HDA-Intel - HDA Intel PCH
                      HDA Intel PCH at 0xf7c10000 irq 45
And then:

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alsamixer -c "CMI8738"
Instead of:

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alsamixer -c "0"

Re: script for quick switch between audio interfaces via commandline

Posted: Sun Oct 20, 2019 10:25 pm
by nikgnomicradio

Code: Select all

I am primarily interested in switching the master instead of restarting jack completely.
do not see how you can switch out system device that is part of the command to start JACK without restarting

maybe if started JACK with dummy device, then alsa_in and alsa_out commands to load ALSA device
would that allow ALSA device to be removed and replaced later without disturbing JACK ?
I switch between 2 different USB audio interfaces that BOTH show up as "hw:USB,0"
if they are non-identical devices, the Vendor ID (vid) and Product ID (pid) numbers can be assigned to ALSA index numbers
https://alsa.opensrc.org/MultipleUSBAudioDevices

Re: script for quick switch between audio interfaces via commandline

Posted: Mon Oct 21, 2019 6:50 am
by tavasti
nikgnomicradio wrote: maybe if started JACK with dummy device, then alsa_in and alsa_out commands to load ALSA device
would that allow ALSA device to be removed and replaced later without disturbing JACK ?
Instead of alsa_in and alsa_out, jack_load could be used.

Re: script for quick switch between audio interfaces via commandline

Posted: Mon Oct 21, 2019 1:28 pm
by merlyn
You can switch device while JACK is running using

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jack_control dps device hw:<x>
jack_control sm
You can if you're using jackdbus. Does jack_control do anything if you're using jackd?

@alignwaivers there must be a unique identifier for each card. If you do

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aplay -l
you'll get the card indexes which you can use as hw:<x> rather than the name of the card.

Re: script for quick switch between audio interfaces via commandline

Posted: Sun Oct 27, 2019 12:24 pm
by alignwaivers
thanks for the insights, the one issue is going by the hw:#, means you always have to plug audio devices in the same order.

Fortunately I found some good options for renaming the devices https://jackaudio.org/faq/device_naming.html


and also a completely separate solution: https://github.com/SpotlightKid/