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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. Co-authored-by: Adrian Sampson <adrian@radbox.org>
80 lines
2.7 KiB
Python
80 lines
2.7 KiB
Python
# This file is part of beets.
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#
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# Permission is hereby granted, free of charge, to any person obtaining
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# a copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish,
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# distribute, sublicense, and/or sell copies of the Software, and to
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# permit persons to whom the Software is furnished to do so, subject to
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# the following conditions:
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#
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# The above copyright notice and this permission notice shall be
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# 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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"""
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from beets import ui
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from beets import util
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from beets.plugins import BeetsPlugin
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from librosa import load, beat
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from soundfile import LibsndfileError
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class AutoBPMPlugin(BeetsPlugin):
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def __init__(self):
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super().__init__()
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self.config.add({
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'auto': True,
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'overwrite': False,
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})
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if self.config['auto'].get(bool):
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self.import_stages = [self.imported]
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def commands(self):
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cmd = ui.Subcommand('autobpm',
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help='detect and add bpm from audio using Librosa')
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cmd.func = self.command
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return [cmd]
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def command(self, lib, opts, args):
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self.calculate_bpm(lib.items(ui.decargs(args)),
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write=ui.should_write())
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def imported(self, session, task):
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self.calculate_bpm(task.imported_items())
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def calculate_bpm(self, items, write=False):
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overwrite = self.config['overwrite'].get(bool)
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for item in items:
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if item['bpm']:
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self._log.info('found bpm {0} for {1}',
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item['bpm'], util.displayable_path(item.path))
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if not overwrite:
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continue
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try:
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y, sr = load(util.syspath(item.path), res_type='kaiser_fast')
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except LibsndfileError as exc:
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self._log.error('LibsndfileError: failed to load {0} {1}',
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util.displayable_path(item.path), exc)
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continue
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except ValueError as exc:
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self._log.error('ValueError: failed to load {0} {1}',
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util.displayable_path(item.path), exc)
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continue
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tempo, _ = beat.beat_track(y=y, sr=sr)
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bpm = round(tempo)
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item['bpm'] = bpm
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self._log.info('added computed bpm {0} for {1}',
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bpm, util.displayable_path(item.path))
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if write:
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item.try_write()
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item.store()
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