jackclient-python/examples/midi_file_player.py at master · pythonthings/jackclient-python · GitHub

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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')

jackclient-python/examples/midi_file_player.py at master · pythonthings/jackclient-python · GitHub

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