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PyPortMidi v0.03 03/15/05 Python wrappings for PortMidi John Harrison


PyPortMidi is a Python wrapper for PortMidi. PortMidi is a cross-platform C library for realtime MIDI control. Using PyPortMidi, you can send and receive MIDI data in realtime from Python.

Besides using PyPortMidi to communicate to synthesizers and the like, it is possible to use PyPortMidi as a way to send MIDI messages between software packages on the same computer. For example, Using PyPortMidi and MIDI-YOKE on a Windows machine, it is possible to send realtime MIDI messages between programs on the same computer using loopback virtual MIDI ports.

PyPortMidi is cross-platform, but it will require some small changes in the file for it to install correctly on Linux machines. The changes should be pretty straightforward, and I am anxious to work with a Linux user on the port.

PyPortMidi was written in Pyrex, a language for writing Python extension modules.

Installing PyPortMidi from its Pyrex source code:

  1. Linux only: install ASLA if it is not installed:

  2. Install Pyrex if it is not installed

  3. Choose to rebuild the PortMidi C library...or not: compiled binaries of the PortMidi package are included for Win32,

    OS X, and Linux, so you can skip this step. However, If you need to rebuild these:

    1. download and extract PortMidi

    2. Win32: - compile PortMidi with MS VC 6.0 (free download)
      • use LIB from the MS VC 6.0 package to create porttime.lib and portmidi.lib
      • copy porttime.lib and portmidi.lib to PyPortmidi's win32 subdirectory
    3. OS X: - change to PortMidi subdirectory pm_mac
      • compile. Type: xcodebuild -project pm_mac.pbproj
      • copy newly created libportmidi.a to PyPortMidi's OSX subdirectory
    4. Linux: - type <make> from PortMidi's root directory
      • copy libportmidi.a

        from portmidi's pm_linux directory to PyPortMidi's linux directory

      • copy libporttime.a

        from portmidi's porttime directory to PyPortMidi's linux directory

  4. in PyPortMidi's root directory, type: python install (make sure you have admin/superuser privileges)

Distribution of PyPortMidi compiled code:

I have provided a Win32 installer for Python 2.3.x. I would welcome a Win32 installer for Python 2.4. I have not provided installers for OS X or Linux because I suspect these users would rather compile from source code. If this is not the case, please tell me.

Using PyPortMidi

Running the sample script and looking at the code is the easiest way to start. The classes and functions are mostly documented, or seem self-explanatory.

You can also look at the portmidi.h header, which heavily documents all of PortMidi's functions.

Bugs, suggestions etc.

I welcome any bugs you have to report or any suggestions you have about how to improve the code and the interface.