Script to convert midi files into C structure exploitable by (e.g.) microcontrollers

midi2c.py

#!/usr/bin/env python2

# This script uses mido <https://pypi.python.org/pypi/mido/1.1.3> to
# transform a midi file into a C structure to be played by a
# microcontroller firmware for example

from mido import MidiFile
import sys

if len(sys.argv) != 2:
	sys.stdout.write("Usage: {0} <midi_file>\n".format(sys.argv[0]))
	exit(1)

sys.stdout.write("""
typedef struct st_melody {
	char note_on; ///< Is note on (0 = OFF ; 1 = ON)
	char channel; ///< Note midi channel
	char note;    ///< Note midi tone
	int duration; ///< Time to wait (ms) until next note action
} melody_t;
""")

sys.stdout.write("\nmelody_t melody[] = {\n")
for message in MidiFile(sys.argv[1]):
	if message.type != 'note_on' and message.type != 'note_off':
		continue
	note_on = '1'
	if message.type == 'note_off':
		note_on = '0'
	sys.stdout.write('	{')
	sys.stdout.write(note_on)
	sys.stdout.write(', ')
	sys.stdout.write(str(message.channel))
	sys.stdout.write(', ')
	sys.stdout.write(str(message.note))
	sys.stdout.write(', ')
	sys.stdout.write(str(int(message.time*1000)))
	sys.stdout.write('},\n')
sys.stdout.write('};\n')