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Update beatfinder to version 4

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No changes to algorithm or behaviour, but removed duplicate resampling.
This commit is contained in:
Steve Daulton 2019-06-03 23:53:27 +01:00
parent 090374381c
commit feb35a2601
1 changed files with 28 additions and 13 deletions
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41
plug-ins/beat.ny
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@ -1,11 +1,11 @@
$nyquist plug-in
$version 1
$version 4
$type analyze
$name (_ "Beat Finder")
$manpage "Beat_Finder"
$action (_ "Finding beats...")
$author (_ "Audacity")
$release 2.3.0
$release 2.3.2
$copyright (_ "Released under terms of the GNU General Public License version 2")
;; Released under terms of the GNU General Public License version 2:
@ -16,14 +16,29 @@ $copyright (_ "Released under terms of the GNU General Public License version 2"
$control thresval (_ "Threshold Percentage") int "" 65 5 100
(setf s1 (if (arrayp s) (snd-add (aref s 0) (aref s 1)) s))
(defun signal () (force-srate 1000 (lp (snd-follow (lp s1 50) 0.001 0.01 0.1 512) 10)))
(setq max (peak (signal) NY:ALL))
(setq thres (* (/ thresval 100.0) max))
(setq s2 (signal))
(do ((c 0.0) (l NIL) (p T) (v (snd-fetch s2))) ((not v) l)
; "B" seems too short to put into the i18n catalog. Make it a control?
(if (and p (> v thres)) (setq l (cons (list c "B") l)))
(setq p (< v thres))
(setq c (+ c 0.001))
(setq v (snd-fetch s2)))
(setf threshold (/ thresval 100.0))
(defun mix-to-mono (sig)
(if (arrayp sig)
(sum (aref sig 0) (aref sig 1))
sig))
(defun bass-tracker (sig)
(let* ((bass (lp sig 50))
;(snd-follow sound floor risetime falltime lookahead)
(follower (snd-follow bass 0.001 0.01 0.1 512)))
(force-srate 1000 (lp follower 10))))
(let ((beats (bass-tracker (mix-to-mono *track*))))
(setf peak-sig (peak beats ny:all))
(setf threshold (* threshold peak-sig))
(do ((time 0.0 (+ time 0.001))
(val (snd-fetch beats) (snd-fetch beats))
(flag T)
labels)
((not val) labels)
(when (and flag (> val threshold))
(push (list time "B") labels))
(setf flag (< val threshold))))