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# This file is part of beets.
# Copyright 2016, aroquen
#
# 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.
"""Determine BPM by pressing a key to the rhythm."""
import time
from beets import ui
from beets.plugins import BeetsPlugin
def bpm(max_strokes):
"""Returns average BPM (possibly of a playing song)
listening to Enter keystrokes.
"""
t0 = None
dt = []
for i in range(max_strokes):
# Press enter to the rhythm...
s = input()
if s == "":
t1 = time.time()
# Only start measuring at the second stroke
if t0:
dt.append(t1 - t0)
t0 = t1
else:
break
# Return average BPM
# bpm = (max_strokes-1) / sum(dt) * 60
ave = sum([1.0 / dti * 60 for dti in dt]) / len(dt)
return ave
class BPMPlugin(BeetsPlugin):
def __init__(self):
super().__init__()
self.config.add(
{
"max_strokes": 3,
"overwrite": True,
}
)
def commands(self):
cmd = ui.Subcommand(
"bpm",
help="determine bpm of a song by pressing a key to the rhythm",
)
cmd.func = self.command
return [cmd]
def command(self, lib, opts, args):
write = ui.should_write()
self.get_bpm(lib.items(args), write)
def get_bpm(self, items, write=False):
overwrite = self.config["overwrite"].get(bool)
if len(items) > 1:
raise ValueError("Can only get bpm of one song at time")
item = items[0]
if item["bpm"]:
self._log.info("Found bpm {}", item["bpm"])
if not overwrite:
return
self._log.info(
"Press Enter {} times to the rhythm or Ctrl-D to exit",
self.config["max_strokes"].get(int),
)
new_bpm = bpm(self.config["max_strokes"].get(int))
item["bpm"] = int(new_bpm)
if write:
item.try_write()
item.store()
self._log.info("Added new bpm {}", item["bpm"])
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