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Python library for building RTP-MIDI / AppleMIDI clients and servers
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A python RTP-MIDI / AppleMIDI implementation. You can use this library to build a network attached virtual MIDI device.

Build Status

Latest release: v0.4.0 (2018-12-26) (changelog)

Table of Contents


$ pip install pymidi


pipenv install pymidi

See Using in Another Project and the Developer Setup wiki for more information.

Developer Setup

Set up your workspace with the very excellent Pipenv:

$ pipenv install

Once installed, you'll probably find it useful to work in a pipenv shell, for ease of testing and running things:

$ pipenv shell
$ python pymidi/


pymidi has been tested against Python 2.7 and Python 3.6.

Running tests

Tests are run with nose; either of the following will work:

$ python test
$ nosetests

Developing against something else

If you're working on a project that uses pymidi and want to develop both concurrently, leverage the setuptools develop command:

$ cd ~/git/otherproject
$ pipenv shell
$ pushd ~/git/pymidi && python develop && popd

This creates a link to ~/git/pymidi within the environment of ~/git/otherproject.

Demo Server

The library includes a simple demo server which prints stuff.

$ python pymidi/

See --help for usage.

Using in Another Project

Most likely you will want to embed a server in another project, and respond to MIDI commands in some application specific way. The demo serve is an example of what you need to do.

First, create a subclass of server.Handler to implement your policy:

from pymidi import server

class MyHandler(server.handler)
    def on_peer_connected(self, peer):
        print('Peer connected: {}'.format(peer))

    def on_peer_disconnected(self, peer):
        print('Peer disconnected: {}'.format(peer))

    def on_midi_commands(self, command_list):
        for command in command_list:
            if command.command == 'note_on':
                key = command.params.key
                velocity = command.params.velocity
                print('Someone hit the key {} with velocity {}'.format(key, velocity))

Then install it in a server and start serving:

server = new Server()

See the Developer Setup wiki for ways to test with real devices.

Project Status

What works:

  • Exchange packet parsing
  • Timestamp sync packet parsing
  • Exchange & timestamp sync protocol support
  • MIDI message parsing

Not (yet) implemented:

  • Journal contents parsing
  • Verification of peers on the data channel
  • Auto-disconnect peers that stop synchronizing clocks

References and Reading

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