rtmidi-python

rtmidi-python

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

Setup

The wrapper is written in Cython_, but the generated C++ code is included, so you can install the module as usual::

python setup.py 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 setup.py 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.open_port(0)

    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()
midi_in.open_port(0)

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
    midi_in.open_port(0)

    # 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()``.

License
-------

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

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

.. _RtMidi: http://www.music.mcgill.ca/~gary/rtmidi/
.. _Cython: http://www.cython.org