def test_io_midi_sync():
tempo = 150
midi_out = iso.MidiOutputDevice(VIRTUAL_DEVICE_NAME,
virtual=True,
send_clock=True)
print("Created MIDI out: %s" % midi_out)
clock = iso.Clock(tempo=tempo, clock_target=midi_out)
midi_in = iso.MidiInputDevice(VIRTUAL_DEVICE_NAME)
clock.background()
time.sleep(0.1)
clock.stop()
assert midi_in.tempo == pytest.approx(tempo, rel=0.03)
def test_timeline_tempo(dummy_timeline):
# Set tempo of internal clock
dummy_timeline.clock_source = iso.Clock(dummy_timeline, 120)
dummy_timeline.tempo = 180
assert dummy_timeline.clock_source.tempo == 180
# Set tempo of external clock (raise exception)
try:
dummy_timeline.clock_source = iso.MidiInputDevice("Virtual Device", virtual=True)
assert dummy_timeline.tempo is None
with pytest.raises(RuntimeError):
dummy_timeline.tempo = 180
except iso.DeviceNotFoundException:
# Fail quietly on machines that don't support MIDI
pass
def test_io_midi():
"""
Send a MIDI message through a virtual loopback device.
Note that virtual=True is not needed for subsequent calls, as it has already been
created so is visible to rtmidi as an existing device.
"""
events = []
def log_event(message):
nonlocal events
events.append(message)
midi_in = iso.MidiInputDevice(VIRTUAL_DEVICE_NAME, virtual=True)
midi_in.callback = log_event
midi_out = iso.MidiOutputDevice(VIRTUAL_DEVICE_NAME)
timeline = iso.Timeline(120, midi_out)
timeline.stop_when_done = True
timeline.schedule({"note": iso.PSequence([60], 1), "duration": 0.1})
timeline.run()
assert len(events) == 1
#
# 1. takes MIDI input, and constructs three markov chains for pitch, duration
# and amplitude.
# 2. after receiving a keyboard interrupt (ctrl-c), plays back melodies which are
# statistically similar to the input.
#------------------------------------------------------------------------
import isobar as iso
import logging
logging.basicConfig(level=logging.INFO, format="[%(asctime)s] %(message)s")
import time
midi_in = iso.MidiInputDevice()
midi_out = iso.MidiOutputDevice()
learner = iso.MarkovParallelLearners(3)
clock0 = time.time()
print("Listening for MIDI events...")
try:
while True:
message = midi_in.poll()
if message is not None and message.type == "note_on":
clock = time.time()
print("[%f] %s (%d, %d)" %
(clock, message, message.note, message.velocity))