Listen to and print JACK client/port meta-data changes.

jack-property-listener.py

#!/usr/bin/env python3
"""Listen to and print JACK client/port meta-data changes."""

import jack


PROPERTY_CHANGE_MAP = {
    jack.PROPERTY_CREATED: 'created',
    jack.PROPERTY_CHANGED: 'changed',
    jack.PROPERTY_DELETED: 'deleted'
}

def callback(subject, key, type_):
    print("Property '%s' on subject %s %s." % (key, subject, PROPERTY_CHANGE_MAP[type_]))


client = jack.Client('Metadata-Client')
client.set_property_change_callback(callback)

with client:
    try:
        input("Press enter to quit...\n")
    except (EOFError, KeyboardInterrupt):
        print('')