A few MIDI scripts

[Flaneurette]

Maybe useful for those who want to work with raw MIDI inside Python. I originally wrote these scripts for ReaScore, an unreleased Python score notation app.

It is collection of python files I wrote to control MIDI and MIDI devices through Reaper. It also has a small library to read and write MIDI files inside Python.

If you wonder how to connect MIDI devices, enumerate them on Windows, then this might be helpful, because there is little information on this.

Download: https://stash.reaper.fm/32364/MIDI.zip


windll.winmm MIDI CAPS example, to enumerate the connected MIDI devices on Windows:

    def devices(self,method):

        devicelist = []

        '''
        caps.wMid,
        caps.wPid,
        caps.vDriverVersion,
        caps.wVoices,
        caps.wNotes,
        caps.wChannel_mask,
        caps.dwSupport
        '''

        if method == 'in':

            dev = self.lib.midiInGetNumDevs()
            try:
                caps = MIDIINCAPS()
                for i in range(0,dev):
                    out = self.lib.midiInGetDevCapsA(i,byref(caps),ctypes.sizeof(caps))
                    name = ctypes.string_at(ctypes.cast(caps.szPname, c_char_p))
                    devicelist.extend([
                    name.decode(encoding="utf-8")
                    ])

            except (RuntimeError, NameError, TypeError, AttributeError):
                pass
        else:

            dev = self.lib.midiOutGetNumDevs()
            try:
                caps = MIDIOUTCAPS()
                for i in range(-1,dev):
                    out = self.lib.midiOutGetDevCapsA(i,byref(caps),ctypes.sizeof(caps))
                    name = ctypes.string_at(ctypes.cast(caps.szPname, c_char_p))
                    devicelist.extend([
                    name.decode(encoding="utf-8")
                    ])

            except (RuntimeError, NameError, TypeError, AttributeError):
                pass

        return devicelist

from ctypes import WINFUNCTYPE, wintypes, c_long, c_char_p, byref
from ctypes.wintypes import *

MIDI_CALLBACK_FUNCTION = 196608

WNDPROC = WINFUNCTYPE(None, c_long, UINT, DWORD, DWORD, DWORD)

class MIDIINCAPS(ctypes.Structure):

    _fields_ = [
        ('wMid', WORD),
        ('wPid', WORD),
        ('vDriverVersion', UINT),
        ('szPname', BYTE * 64),
        ('dwSupport', DWORD),
    ]

class MIDIOUTCAPS(ctypes.Structure):

    _fields_ = [

        ('wMid', WORD),
        ('wPid', WORD),
        ('vDriverVersion', UINT),
        ('szPname', BYTE * 64),
        ('wTechnology', WORD),
        ('wVoices', WORD),
        ('wNotes', WORD),
        ('wChannel_mask', WORD),
        ('dwSupport', DWORD),
    ]

    device_type = [

        'NONE',
        'MOD_MIDIPORT',     # MIDI hardware port.
        'MOD_SYNTH',        # Synthesizer.
        'MOD_SQSYNTH',      # Square wave synthesizer.
        'MOD_FMSYNTH',      # FM synthesizer
        'MOD_MAPPER',       # Microsoft MIDI mapper.
        'MOD_WAVETABLE',    # Hardware wavetable synthesizer.
        'MOD_SWSYNTH',      # Software synthesizer.
        'NONE',
    ]

[Time Waster]

Thanks Flaneurette, I've been trying to learn python, so this might give me some clues.