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#!/usr/bin/python3
"""
Receive messages on the input port and print messages with a specific
channel (defaults to 0).
Usage:
python example_input_filter.py portname [CHANNEL] [...]
"""
from __future__ import print_function
import sys
import mido
def accept_notes(port):
"""Only let note_on and note_off messages through."""
for message in port:
if message.type in ('note_on', 'note_off'):
yield message
if len(sys.argv) > 1:
portname = sys.argv[1]
else:
portname = None # Use default port
try:
with mido.open_input(portname) as port:
print('Using {}'.format(port))
print("Ignoring everything but 'note_on' and 'note_off'.")
print('Waiting for notes...')
for message in accept_notes(port):
print('Received {}'.format(message))
except KeyboardInterrupt:
pass
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