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82 lines
2.7 KiB
Python
82 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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from __future__ import annotations
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from collections.abc import Iterable
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import librosa
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from beets.importer import ImportTask
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from beets.library import Item, Library
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from beets.plugins import BeetsPlugin
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from beets.ui import Subcommand, should_write
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class AutoBPMPlugin(BeetsPlugin):
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def __init__(self) -> None:
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super().__init__()
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self.config.add(
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{
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"auto": True,
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"overwrite": False,
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"beat_track_kwargs": {},
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}
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)
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if self.config["auto"]:
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self.import_stages = [self.imported]
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def commands(self) -> list[Subcommand]:
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cmd = Subcommand(
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"autobpm", help="detect and add bpm from audio using Librosa"
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)
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cmd.func = self.command
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return [cmd]
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def command(self, lib: Library, _, args: list[str]) -> None:
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self.calculate_bpm(list(lib.items(args)), write=should_write())
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def imported(self, _, task: ImportTask) -> None:
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self.calculate_bpm(task.imported_items())
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def calculate_bpm(self, items: list[Item], write: bool = False) -> None:
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for item in items:
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path = item.filepath
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if bpm := item.bpm:
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self._log.info("BPM for {} already exists: {}", path, bpm)
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if not self.config["overwrite"]:
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continue
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try:
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y, sr = librosa.load(item.filepath, res_type="kaiser_fast")
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except Exception as exc:
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self._log.error("Failed to load {}: {}", path, exc)
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continue
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kwargs = self.config["beat_track_kwargs"].flatten()
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try:
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tempo, _ = librosa.beat.beat_track(y=y, sr=sr, **kwargs)
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except Exception as exc:
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self._log.error("Failed to measure BPM for {}: {}", path, exc)
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continue
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bpm = round(tempo[0] if isinstance(tempo, Iterable) else tempo)
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item["bpm"] = bpm
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self._log.info("Computed BPM for {}: {}", path, bpm)
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if write:
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item.try_write()
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item.store()
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