This is a port of midilib from inside the BashoBanjo to Elixir. I learned after finishing it that it was written by Jim Menard. His original is here
He also ported it to Elixir, I learned later, and his has tests (which are obviously a good thing). His version can be found here.
To see the midi file reading working, from inside
iex -S mix:
It can also generate .au files of a given midi note, intensity, and duration. This was ported from the BashoBanjo vnode lib. You can use it like so:
ExMidilib.AuGenerator.generate(120, 0.5, 1)
To hear it play a midifile it's read (by reading the midi data, generating PCM files on the fly, and piping those into paplay), run this: