midiio

Cross-platform realtime MIDI I/O for the BEAM.

midiio is an Erlang NIF over the single-header minimidio C library. It is the transport layer: it discovers MIDI devices and moves raw MIDI bytes to and from the operating system's MIDI ports (CoreMIDI on macOS, WinMM on Windows, ALSA sequencer on Linux, Web MIDI under Emscripten) in real time.

It is deliberately codec-free. midiio has no opinion about what the bytes mean and does not depend on midilib — if you want raw realtime MIDI in the BEAM and bring your own message representation, this is all you need. If you want messages encoded/decoded for you and Standard MIDI File support, use the midi umbrella instead.

Where it sits

minimidio.h ─► midiio  (transport: raw bytes ⇄ OS ports)     midilib  (codec + .mid files, pure Erlang)
                            └────────────────┬────────────────────┘
                                          midi  (one batteries-included API)

Library	Layer	Native build?
midilib	message codec + Standard MIDI File read/write	no (pure Erlang)
midiio	realtime device I/O (NIF)	yes (vendors minimidio)
midi	the whole enchilada: codec + I/O behind one API	yes (via midiio)

Status

Early placeholder — 0.0.1. The NIF, build wiring, and public API are under active development; the API will change. Published to Hex to reserve the name.

Build

$ rebar3 compile