20.ex-midi-input.py

#!/usr/bin/env python3

#------------------------------------------------------------------------
# MIDI input example.
# Listens for a sequence of notes.
# Press ctrl-c to stop listening, and the system will replay the input.
#------------------------------------------------------------------------

from isobar import *
import logging
import time

def main():
    midi_in = MidiInputDevice()

    notes = []
    durations = []
    last_note_time = None

    print("Listening for notes on %s. Press Ctrl-C to stop." % midi_in.device_name)

    try:
        while True:
            note = midi_in.receive()
            if note is not None:
                print(" - Read note: %s" % note.note)
                notes.append(note)
                if last_note_time is not None:
                    durations.append(time.time() - last_note_time)
                last_note_time = time.time()

    except KeyboardInterrupt:
        pass

    if last_note_time:
        durations.append(time.time() - last_note_time)

        print()
        print("----------------------------------------------------")
        print("Ctrl-C detected, now playing back")
        print("----------------------------------------------------")

        timeline = Timeline(60)
        timeline.stop_when_done = True
        timeline.schedule({
            "note": PSequence([note.note for note in notes], 1),
            "duration": PSequence(durations, 1)
        })
        timeline.run()
    else:
        print()
        print("No notes detected")

if __name__ == "__main__":
    logging.basicConfig(level=logging.INFO, format="[%(asctime)s] %(message)s")
    main()