python-rtmidi/examples/basic/midiin_callback.py at master · ritterb8484/python-rtmidi · GitHub

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#!/usr/bin/env python

# midiin_callback.py

"""Show how to receive MIDI input by setting a callback function."""

from __future__ import print_function

import logging

import sys

import time

from rtmidi.midiutil import open_midiinput

log = logging.getLogger('midiin_callback')

logging.basicConfig(level=logging.DEBUG)

class MidiInputHandler(object):

def __init__(self, port):

self.port = port

self._wallclock = time.time()

def __call__(self, event, data=None):

message, deltatime = event

self._wallclock += deltatime

print("[%s] @%0.6f %r" % (self.port, self._wallclock, message))

# Prompts user for MIDI input port, unless a valid port number or name

# is given as the first argument on the command line.

# API backend defaults to ALSA on Linux.

port = sys.argv[1] if len(sys.argv) > 1 else None

try:

midiin, port_name = open_midiinput(port)

except (EOFError, KeyboardInterrupt):

sys.exit()

print("Attaching MIDI input callback handler.")

midiin.set_callback(MidiInputHandler(port_name))

print("Entering main loop. Press Control-C to exit.")

try:

# Just wait for keyboard interrupt,

# everything else is handled via the input callback.

while True:

time.sleep(1)

except KeyboardInterrupt:

print('')

finally:

print("Exit.")

midiin.close_port()

del midiin

python-rtmidi/examples/basic/midiin_callback.py at master · ritterb8484/python-rtmidi · GitHub

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