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# This file is part of beets.
# Copyright 2014, 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
import logging
from beets import ui
from beets.plugins import BeetsPlugin
log = logging.getLogger('beets')
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 = raw_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(BPMPlugin, self).__init__()
self.config.add({
u'max_strokes': 3,
u'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):
self.get_bpm(lib.items(ui.decargs(args)))
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']:
log.info(u'Found bpm {0}'.format(item['bpm']))
if not overwrite:
return
log.info(u'Press Enter {0} times to the rhythm or Ctrl-D '
u'to exit'.format(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()
log.info(u'Added new bpm {0}'.format(item['bpm']))
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