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# MIDI Multicast
Broadcast and synthesise MIDI over UDP. The advantage of a connectionless
protocol is that multiple servers and clients are easily supported, and the
clients can be started while the servers are off.
## Development
Run `nix develop` for a development environment.
Inside it, run `make`. `src` must point to the source code, and `out` must
point to where the build artefacts should be placed. For example:
```sh
make src=. out=bin
```
## Compilation
Run `nix build`.
## Options
Options are passed through environment variables.
### Common
- `MCAST_GROUP`: The UDP multicast address.
- `MCAST_PORT`: The UDP multicast port.
- `DEBUG`: Increase verbosity.
### Client
- `RELAY_DELAY`: The intended delay in milliseconds between the time a message
is sent and played. Increasing it reduces stuttering but increases latency.
Both the client and server should have synchronised clocks.
- `SOUNDFONT`: The path to the sound font for synthesis.
### Server
- `MIDI_IN`: The name of the MIDI input in ALSA.
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