ex-portmidi

ex-portmidi is a wrapper for the PortMidi C library, that provides some nice abstractions to (write to|listen on) MIDI devices.

Installation

1. Add portmidi to your list of dependencies in mix.exs:

def deps do
  [{:portmidi, "~> 1.0"}]
end

1. Ensure portmidi is started before your application:

def application do
  [applications: [:portmidi]]
end

1. If you are not planning on using more than one device, and you know the name of the device you are gonna use, configure a device name in your app's configuration files:

config :portmidi, device: "Launchpad Mini"

Usage

To send MIDI events to a MIDI device:

iex(1)> {:ok, output} = PortMidi.open(:output, "Launchpad Mini")
{:ok, #PID<0.172.0>}
iex(2)> PortMidi.write(output, [176, 0, 127])
:ok
iex(3)> PortMidi.close(:output, output)
:ok

To listen for MIDI events from a MIDI device:

iex(1)> {:ok, input} = PortMidi.open(:input, "Launchpad Mini")
{:ok, #PID<0.103.0>}
ex(2)> PortMidi.listen(input, self)
:ok
iex(3)> receive do
...(3)>   event -> IO.inspect(event)
...(3)> end
[144, 112, 127]
iex(4)> PortMidi.close(:input, input)
:ok

As simple as that.