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Python wrapper for RtMidi
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Python wrapper for RtMidi, the lightweight, cross-platform MIDI I/O library. For Linux, Mac OS X and Windows.


On Windows, the preferred way is to use one of the precompiled binaries available from PyPI. On Linux and Mac OS X, the easiest way to install rtmidi-python is using pip:

pip install rtmidi-python

Alternatively, you can build the module from source as follows:

python install

If you want to build from the Cython source, make sure that you have a recent version of Cython (>= 0.17), and run:

python install --from-cython

Usage Examples

rtmidi-python uses the same API as RtMidi, only reformatted to comply with PEP-8, and with small changes to make it a little more pythonic.

Print all output ports

import rtmidi_python as rtmidi

midi_out = rtmidi.MidiOut()
for port_name in midi_out.ports:
    print port_name

Send messages

import rtmidi_python as rtmidi

midi_out = rtmidi.MidiOut()

midi_out.send_message([0x90, 48, 100]) # Note on
midi_out.send_message([0x80, 48, 100]) # Note off

Get incoming messages by polling

import rtmidi_python as rtmidi

midi_in = rtmidi.MidiIn()

while True:
    message, delta_time = midi_in.get_message()
    if message:
        print message, delta_time

Note that the signature of get_message() differs from the original RtMidi API: It returns a tuple instead of using a return parameter.

Get incoming messages using a callback

import rtmidi_python as rtmidi

def callback(message, time_stamp):
    print message, time_stamp

midi_in = rtmidi.MidiIn()
midi_in.callback = callback

# do something else here (but don't quit)

Note that the signature of the callback differs from the original RtMidi API: message is now the first parameter, like in the tuple returned by get_message().


rtmidi-python is licensed under the MIT License, see LICENSE.

It uses RtMidi, licensed under a modified MIT License, see RtMidi/RtMidi.h.

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