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This plugin uses librosa to automatically calculate the BPM for a track. It is based on the keyfinder plugin, and rounds the BPM to an int.
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# This file is part of beets. | ||
# | ||
# Permission is hereby granted, free of charge, to any person obtaining | ||
# a copy of this software and associated documentation files (the | ||
# "Software"), to deal in the Software without restriction, including | ||
# without limitation the rights to use, copy, modify, merge, publish, | ||
# distribute, sublicense, and/or sell copies of the Software, and to | ||
# permit persons to whom the Software is furnished to do so, subject to | ||
# the following conditions: | ||
# | ||
# The above copyright notice and this permission notice shall be | ||
# included in all copies or substantial portions of the Software. | ||
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"""Uses Librosa to calculate the `bpm` field. | ||
""" | ||
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import os.path | ||
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from beets import ui | ||
from beets import util | ||
from beets.plugins import BeetsPlugin | ||
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from librosa import load, beat | ||
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class AutoBPMPlugin(BeetsPlugin): | ||
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def __init__(self): | ||
super().__init__() | ||
self.config.add({ | ||
'auto': True, | ||
'overwrite': False, | ||
}) | ||
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if self.config['auto'].get(bool): | ||
self.import_stages = [self.imported] | ||
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def commands(self): | ||
cmd = ui.Subcommand('autobpm', | ||
help='detect and add bpm from audio using Librosa') | ||
cmd.func = self.command | ||
return [cmd] | ||
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def command(self, lib, opts, args): | ||
self.calculate_bpm(lib.items(ui.decargs(args)), write=ui.should_write()) | ||
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def imported(self, session, task): | ||
self.calculate_bpm(task.imported_items()) | ||
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def calculate_bpm(self, items, write=False): | ||
overwrite = self.config['overwrite'].get(bool) | ||
command = [self.config['bin'].as_str()] | ||
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for item in items: | ||
if item['bpm'] and not overwrite: | ||
continue | ||
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y, sr = load(util.syspath(item.path)) | ||
tempo, _ = beat.beat_track(y=y, sr=sr) | ||
bpm = round(tempo) | ||
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item['bpm'] = bpm | ||
self._log.info('added computed bpm {0} for {1}', | ||
bpm, util.displayable_path(item.path)) | ||
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if write: | ||
item.try_write() | ||
item.store() |