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Python wrapper for RtMidi written in Cython. Allows sending raw messages, multi-port input and sending multiple messages in one call.

Project description

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

Based on rtmidi-python


The wrapper is written in Cython. Cython should be installed for this module to be installed. RtMidi is included in the source tree, so you only need to do:

python install

Python 2 & 3

Thanks to Cython, this module is both compatible with Python 2 and Python 3. The only visible difference is that under python 3, all strings are byte strings. If you pass a unicode string to any function taking a string (open_virtual_port), an attempt will be made to encode the string as ASCII, through .encode(“ASCII”, errors=”ignore”).

Usage Examples

rtmidi2 uses a very similar API as RtMidi

Send messages

import rtmidi2

midi_out = rtmidi2.MidiOut()
# open the first available port
# send C3 with vel. 100 on channel 1
midi_out.send_noteon(0, 48, 100)

Get incoming messages - blocking interface

midi_in = rtmidi.MidiIn()

while True:
    message, delta_time = midi_in.get_message()  # will block until a message is available
    if message:
         print(message, delta_time)

Get incoming messages using a callback – non blocking

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

midi_in = rtmidi2.MidiIn()
midi_in.callback = callback

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().

Open multiple ports at once

# get messages from all available ports
midi_in = MidiInMulti().open_ports("*")

def callback(msg, timestamp):
    msgtype, channel = splitchannel(msg[0])
    print(msgtype2str(msgtype), msg[1], msg[2])

midi_in.callback = callback

You can also get the device which generated the event by changing your callback to:

def callback(src, msg, timestamp):
    # src will hold the name of the device
    print("got message from", src)

Send multiple notes at once

The usecase for this is limited to a few niche-cases, but was the reason why this fork was initiated in the first place. I needed a fast way to send multiple notes at once for an application transcribing the spectrum of a voice to midi messages to be played by an automated piano.

# send a cluster of ALL notes with a duration of 1 second
midi_out = MidiOut().open_port()
notes = range(127)
velocities = [90] * len(notes)
midi_out.send_noteon_many(0, notes, velocities)
midi_out.send_noteon_many(0, notes, [0] * len(notes))


rtmidi2 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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Filename, size & hash SHA256 hash help File type Python version Upload date
rtmidi2-0.5.3.tar.gz (33.1 kB) Copy SHA256 hash SHA256 Source None May 30, 2014

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