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https://github.com/arkanosis/smhkd

Simple MIDI hotkontrol daemon
https://github.com/arkanosis/smhkd

alsa audio daemon linux midi midi-controller pipewire pulseaudio

Last synced: about 2 months ago
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Simple MIDI hotkontrol daemon

Host: GitHub
URL: https://github.com/arkanosis/smhkd
Owner: Arkanosis
License: isc
Created: 2022-10-01T15:15:23.000Z (about 2 years ago)
Default Branch: main
Last Pushed: 2024-07-16T14:38:22.000Z (5 months ago)
Last Synced: 2024-10-08T05:11:52.769Z (3 months ago)
Topics: alsa, audio, daemon, linux, midi, midi-controller, pipewire, pulseaudio
Language: Rust
Homepage:
Size: 45.9 KB
Stars: 5
Watchers: 1
Forks: 0
Open Issues: 0
Metadata Files:
- Readme: README.md
- License: LICENSE

Awesome Lists containing this project

README

# smhkd [![](https://img.shields.io/crates/v/smhkd.svg)](https://crates.io/crates/smhkd) [![License](https://img.shields.io/badge/license-ISC-blue.svg)](/LICENSE)

**smhkd** (Simple MIDI hotkontrol daemon) is a daemon that reacts to MIDI events by executing commands.

It's inspired by [sxhkd](https://github.com/baskerville/sxhkd), but handles ALSA MIDI events rather than X events.

# Current Status

smhkd is still in design phase and not yet ready for mainstream usage.

At the moment, *and at the moment only*, it reads a configuration file in `~/.config/smhkd/smhkdrc.json`, which looks like this:

```json
{
"@nanoKONTROL2": {
"0": "pactl set-sink-volume @DEFAULT_SINK@ $VALUE%",
"+32": "pactl set-sink-volume @DEFAULT_SINK@ 100%",
"+48": "pactl set-sink-volume @DEFAULT_SINK@ 30%",
"+64": "pactl set-sink-volume @DEFAULT_SINK@ 0%",

"+41": "playerctl play-pause",
"+42": "playerctl stop",
"+43": "playerctl position 15-",
"+44": "playerctl position 15+",
"+58": "playerctl previous",
"+59": "playerctl next",

"+61": "ddcutil --display 2 setvcp 60 0x11",
"+62": "ddcutil --display 2 setvcp 60 0x0f",

"7": "v4l2-ctl -d /dev/video0 --set-ctrl=zoom_absolute=$VALUE"
},
"129:0": {
"1": "pactl set-sink-volume @DEFAULT_SINK@ $VALUE%",
"+67": "pactl set-sink-volume @DEFAULT_SINK@ 100%",
"+66": "pactl set-sink-volume @DEFAULT_SINK@ 30%",
"+64": "pactl set-sink-volume @DEFAULT_SINK@ 0%"
}
}
```

and it listens to each pair of client and port (`28:0` — where `28` is the client number for `nanoKONTROL2` and `0` the first available port for it — `129:0` and so on…) for MIDI events.

Every time it receives an event, it runs the command associated with the controller ID (if any). Occurences of `$VALUE` in that command are replaced with the value of the event. Buttons are usually associated with value 127 for press and value 0 for release, so to avoid buttons running commands twice, you can prefix the controller ID with either `+` (to run command on press) or `-` (to run command on release). In the example above, it:
- sets the volume of a PulseAudio sink (which can actually be a PipeWire);
- controls a music / video player;
- switches the active input source of a DisplayPort / HDMI monitor;
- sets the zoom level of a webcam

but any command could be executed instead.

Keep in mind that this configuration format is only temporary and will ultimately be replaced with something more similar to what *sxhkd* uses. There is no plan to provide backward compatibility with JSON or even a migration path when than happens.

## Usage

```
Usage: smhkd list
smhkd run
smhkd -h | --help
smhkd --version

Commands:
list List available MIDI controllers.
run Listen to MIDI events and run commands.

Arguments:

Options:
-h, --help Show this screen.
--version Show version.
```

## Running on startup

Run `systemctl --user enable --now smhkd` after installing.

## Compiling

Run `cargo build --release` in your working copy.

## Contributing and reporting bugs

Contributions are welcome through [GitHub pull requests](https://github.com/Arkanosis/smhkd/pulls).

Please report bugs and feature requests on [GitHub issues](https://github.com/Arkanosis/smhkd/issues).

## License