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#!/usr/bin/env python3
"""Play a MIDI file.
This uses the "mido" module for handling MIDI: https://mido.readthedocs.io/
Pass the MIDI file name as first command line argument.
If a MIDI port name is passed as second argument, a connection is made.
"""
import sys
import threading
import jack
from mido import MidiFile
argv = iter(sys.argv)
next(argv)
filename = next(argv, '')
connect_to = next(argv, '')
if not filename:
sys.exit('Please specify a MIDI file')
try:
mid = iter(MidiFile(filename))
except Exception as e:
sys.exit(type(e).__name__ + ' while loading MIDI: ' + str(e))
client = jack.Client('MIDI-File-Player')
port = client.midi_outports.register('output')
event = threading.Event()
msg = next(mid)
fs = None # sampling rate
offset = 0
@client.set_process_callback
def process(frames):
global offset
global msg
port.clear_buffer()
while True:
if offset >= frames:
offset -= frames
return # We'll take care of this in the next block ...
# Note: This may raise an exception:
port.write_midi_event(offset, msg.bytes())
try:
msg = next(mid)
except StopIteration:
event.set()
raise jack.CallbackExit
offset += round(msg.time * fs)
@client.set_samplerate_callback
def samplerate(samplerate):
global fs
fs = samplerate
@client.set_shutdown_callback
def shutdown(status, reason):
print('JACK shutdown:', reason, status)
event.set()
with client:
if connect_to:
port.connect(connect_to)
print('Playing', repr(filename), '... press Ctrl+C to stop')
try:
event.wait()
except KeyboardInterrupt:
print('\nInterrupted by user')
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