[LAD] Controlling apps via hardware buttons

[Jonathan E. Brickman]

>>> Audio related things I've written include python bindings for the 
>>> jack dbus interface, a jack application managing tool to 
>>> start/stop/mute applications via hardware buttons
>>
>> My 7-key SpiderIsland (USB keyboard interface, not MIDI) just came, 
>> and I'm planning to set it up with XFCE keyboard shortcuts to command 
>> non-mixer to do mutes and volume changes, of audio channels in my BNR 
>> ( https://github.com/ponderworthy/the-box-of-no-return-3 ). 
>
> I have an example for python-rtmidi, which does a similar thing, i.e. 
> you can run arbitrary commands on reception of certain MIDI events. 
> You can combine this with e.g. "xdotool" to send keyboard strokes to 
> applications.
>
>     https://github.com/SpotlightKid/python-rtmidi/tree/master/examples/midi2command
>
>
> IIRC, non-mixer has an OSC interface, so the more direct way would be 
> to use a MIDI-to-OSC gateway. I have an example for that using 
> python-rtmidi as well
>
> https://github.com/SpotlightKid/osc2rtmidi
>
> ... but these days I would recommend just using midimonster, which is 
> very powerful and an active project:
>
> https://midimonster.net/ | https://github.com/cbdevnet/midimonster
>
> Chris

Dear Lord, midimonster is quite a monster.  Looks like a very good tool 
when you need it.  I like your method better; simpler. I'm using a 
different Python OSC library and non-midi keyboard control so I can run 
with any MIDI musical keyboard easily, I don't have to sort out MIDI 
events beyond the universal notes and sustain.  So the simplest test is:

    1.  User hits keyboard key, starts a shortcut via distro desktop

    2.  Shortcut starts the following applet, which talks to non-mixer
    using OSC, and tells it to mute the appropriate channel.

import argparse
import random
import time

from pythonosc import udp_client

if __name__ == "__main__":
   parser = argparse.ArgumentParser()
   parser.add_argument("--ip", default="127.0.0.1",
       help="The ip of the OSC server")
   parser.add_argument("--port", type=int, default=7587,
       help="The port the OSC server is listening on")
   args = parser.parse_args()

   client = udp_client.SimpleUDPClient(args.ip, args.port)

   client.send_message("/strip/DistortionOutput/Gain/Mute", 1.0)
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