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45 lines
1.3 KiB
Common Lisp
45 lines
1.3 KiB
Common Lisp
$nyquist plug-in
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$version 4
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$type analyze
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$name (_ "Beat Finder")
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$manpage "Beat_Finder"
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$action (_ "Finding beats...")
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$author (_ "Audacity")
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$release 2.3.2
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$copyright (_ "Released under terms of the GNU General Public License version 2")
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;; Released under terms of the GNU General Public License version 2:
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;; http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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;;
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;; For information about writing and modifying Nyquist plug-ins:
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;; https://wiki.audacityteam.org/wiki/Nyquist_Plug-ins_Reference
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$control thresval (_ "Threshold Percentage") int "" 65 5 100
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(setf threshold (/ thresval 100.0))
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(defun mix-to-mono (sig)
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(if (arrayp sig)
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(sum (aref sig 0) (aref sig 1))
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sig))
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(defun bass-tracker (sig)
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(let* ((bass (lp sig 50))
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;(snd-follow sound floor risetime falltime lookahead)
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(follower (snd-follow bass 0.001 0.01 0.1 512)))
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(force-srate 1000 (lp follower 10))))
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(let ((beats (bass-tracker (mix-to-mono *track*))))
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(setf peak-sig (peak beats ny:all))
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(setf threshold (* threshold peak-sig))
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(do ((time 0.0 (+ time 0.001))
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(val (snd-fetch beats) (snd-fetch beats))
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(flag T)
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labels)
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((not val) labels)
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(when (and flag (> val threshold))
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(push (list time "B") labels))
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(setf flag (< val threshold))))
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