MIDI Objects for Python
Mido is a library for working with MIDI messages and ports. It’s designed to be as straight forward and Pythonic as possible:
>>> import mido >>> output = mido.open_output() >>> output.send(mido.Message('note_on', note=60, velocity=64))
>>> with input as mido.open_input('SH-201'): ... for msg in input: ... print(msg)
>>> msg = mido.Message('program_change', program=10) >>> msg.type 'program_change' >>> msg.channel = 2 >>> msg2 = msg.copy(program=9) <program_change message channel=2, program=9, time=0>
Full documentation at http://mido.readthedocs.org/
This is the first stable release. All basic functionality is in place. (Messages, ports and parser.)
Mido targets Python 2.7 and 3.2 and runs on Ubuntu and Mac OS X. May also run on other systems.
If you want to use message ports, you will need PortMidi installed on your system. The PortMidi library is loaded on demand, so you can use the parser and messages without it.
$ pip install mido
The PortMidi wrapper is written with ctypes, so no compilation is required.
Documentation is available at http://mido.readthedocs.org/
- on OS X, PortMidi usually hangs for a second or two seconds while initializing. (It always succeeds.)
- libportmidi prints out error messages instead of returning err and setting the error message string. Thus, Mido can’t catch errors and raise the proper exception. (I’ve been able to work around this when opening ports, so don’t know if this is still a problem.)
- there is an obscure bug involving the OS X application Midi Keys. See tmp/segfault.py.
- add a library of useful tools, such as delays, an event engine and message filters.
- support running status (This is currently tricky or impossible with PortMidi, but could be useful for other data sources.)
- support time codes (0xf1). (These have one data bytes divided into 3 bits type and 4 bits values. It’s unclear how to handle this.)
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