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