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convert_clean.py
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/
convert_clean.py
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from __future__ import print_function
import os
import json
import errno
from pypianoroll import Multitrack, Track
import pretty_midi
import shutil
ROOT_PATH = '/Users/sumuzhao/Downloads/'
converter_path = os.path.join(ROOT_PATH, 'MIDI/pop/pop_test/converter')
cleaner_path = os.path.join(ROOT_PATH, 'MIDI/pop/pop_test/cleaner')
def make_sure_path_exists(path):
"""Create all intermediate-level directories if the given path does not
exist"""
try:
os.makedirs(path)
except OSError as exception:
if exception.errno != errno.EEXIST:
raise
def get_midi_path(root):
"""Return a list of paths to MIDI files in `root` (recursively)"""
filepaths = []
for dirpath, _, filenames in os.walk(root):
for filename in filenames:
if filename.endswith('.mid'):
filepaths.append(os.path.join(dirpath, filename))
return filepaths
def get_midi_info(pm):
"""Return useful information from a pretty_midi.PrettyMIDI instance"""
if pm.time_signature_changes:
pm.time_signature_changes.sort(key=lambda x: x.time)
first_beat_time = pm.time_signature_changes[0].time
else:
first_beat_time = pm.estimate_beat_start()
tc_times, tempi = pm.get_tempo_changes()
if len(pm.time_signature_changes) == 1:
time_sign = '{}/{}'.format(pm.time_signature_changes[0].numerator,
pm.time_signature_changes[0].denominator)
else:
time_sign = None
midi_info = {
'first_beat_time': first_beat_time,
'num_time_signature_change': len(pm.time_signature_changes),
'time_signature': time_sign,
'tempo': tempi[0] if len(tc_times) == 1 else None
}
return midi_info
def midi_filter(midi_info):
"""Return True for qualified midi files and False for unwanted ones"""
if midi_info['first_beat_time'] > 0.0:
return False
elif midi_info['num_time_signature_change'] > 1:
return False
elif midi_info['time_signature'] not in ['4/4']:
return False
return True
def get_merged(multitrack):
"""Return a `pypianoroll.Multitrack` instance with piano-rolls merged to
five tracks (Bass, Drums, Guitar, Piano and Strings)"""
category_list = {'Bass': [], 'Drums': [], 'Guitar': [], 'Piano': [], 'Strings': []}
program_dict = {'Piano': 0, 'Drums': 0, 'Guitar': 24, 'Bass': 32, 'Strings': 48}
for idx, track in enumerate(multitrack.tracks):
if track.is_drum:
category_list['Drums'].append(idx)
elif track.program//8 == 0:
category_list['Piano'].append(idx)
elif track.program//8 == 3:
category_list['Guitar'].append(idx)
elif track.program//8 == 4:
category_list['Bass'].append(idx)
else:
category_list['Strings'].append(idx)
tracks = []
for key in category_list:
if category_list[key]:
merged = multitrack[category_list[key]].get_merged_pianoroll()
tracks.append(Track(merged, program_dict[key], key == 'Drums', key))
else:
tracks.append(Track(None, program_dict[key], key == 'Drums', key))
return Multitrack(None, tracks, multitrack.tempo, multitrack.downbeat, multitrack.beat_resolution, multitrack.name)
def converter(filepath):
"""Save a multi-track piano-roll converted from a MIDI file to target
dataset directory and update MIDI information to `midi_dict`"""
try:
midi_name = os.path.splitext(os.path.basename(filepath))[0]
multitrack = Multitrack(resolution=24, name=midi_name)
pm = pretty_midi.PrettyMIDI(filepath)
midi_info = get_midi_info(pm)
multitrack = pypianoroll.from_pretty_midi(pm)
merged = get_merged(multitrack)
make_sure_path_exists(converter_path)
merged.save(os.path.join(converter_path, midi_name + '.npz'))
return [midi_name, midi_info]
except:
return None
def main():
"""Main function of the converter"""
midi_paths = get_midi_path(os.path.join(ROOT_PATH, 'MIDI/pop/pop_test/origin_midi'))
midi_dict = {}
kv_pairs = [converter(midi_path) for midi_path in midi_paths]
for kv_pair in kv_pairs:
if kv_pair is not None:
midi_dict[kv_pair[0]] = kv_pair[1]
with open(os.path.join(ROOT_PATH, 'MIDI/pop/pop_test/midis.json'), 'w') as outfile:
json.dump(midi_dict, outfile)
print("[Done] {} files out of {} have been successfully converted".format(len(midi_dict), len(midi_paths)))
with open(os.path.join(ROOT_PATH, 'MIDI/pop/pop_test/midis.json')) as infile:
midi_dict = json.load(infile)
count = 0
make_sure_path_exists(cleaner_path)
midi_dict_clean = {}
for key in midi_dict:
if midi_filter(midi_dict[key]):
midi_dict_clean[key] = midi_dict[key]
count += 1
shutil.copyfile(os.path.join(converter_path, key + '.npz'),
os.path.join(cleaner_path, key + '.npz'))
with open(os.path.join(ROOT_PATH, 'MIDI/pop/pop_test/midis_clean.json'), 'w') as outfile:
json.dump(midi_dict_clean, outfile)
print("[Done] {} files out of {} have been successfully cleaned".format(count, len(midi_dict)))
if __name__ == "__main__":
main()