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https://github.com/cookiengineer/audacity
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22 lines
767 B
Common Lisp
22 lines
767 B
Common Lisp
;nyquist plug-in
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;version 1
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;type analyze
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;categories "http://audacityteam.org/namespace#OnsetDetector"
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;name "Beat Finder..."
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;action "Finding beats..."
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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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;control thresval "Threshold Percentage" int "" 65 5 100
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(setf s1 (if (arrayp s) (snd-add (aref s 0) (aref s 1)) s))
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(defun signal () (force-srate 1000 (lp (snd-follow (lp s1 50) 0.001 0.01 0.1 512) 10)))
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(setq max (peak (signal) NY:ALL))
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(setq thres (* (/ thresval 100.0) max))
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(setq s2 (signal))
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(do ((c 0.0) (l NIL) (p T) (v (snd-fetch s2))) ((not v) l)
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(if (and p (> v thres)) (setq l (cons (list c "B") l)))
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(setq p (< v thres))
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(setq c (+ c 0.001))
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(setq v (snd-fetch s2)))
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