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TrimSilence.ny
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TrimSilence.ny
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;nyquist plug-in
;version 4
;name "Trim Silence..."
;type process
;action "Trimming audio..."
;preview disabled
;restoresplits 0
;mergeclips 1
;author "Steve Daulton"
;copyright "Released under terms of the GNU General Public License version 2"
;control threshold "Silence Threshold (dB)" real "" -48 -100 0
;control min-start-silence "Silence to leave at start (0 to 30 seconds)" real "" 0 0 30
;control min-end-silence "Silence to leave at end (0 to 30 seconds)" real "" 0 0 30
;; TrimSilence.ny by Steve Daulton. Aug 2011.
;; Last updated Oct 2015.
;; Released under terms of the GNU General Public License version 2:
;; http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
;; RAM USAGE:
;; This plug-in requires the audio to be loaded into RAM.
;; If there is insufficient free RAM Audacity may freeze or crash.
;; The line below limits RAM usage to 1.0 GB (about 47 minutes for
;; a stereo track at 44.1 kHz)
;; If your computer has more than 1GB of physical RAM available, the
;; limit may be increased a little, but not more than 2GB.
(setq RAM-Limit 1.0) ; RAM limit in GB
; convert threhold to linear
(setq threshold (db-to-linear (min 0 threshold)))
;; Limit of duration in seconds
(setq limit
(/ (* ram-limit 1000000000)
(* 4.0 *sound-srate*)))
(when (arrayp *track*)(setq limit (/ limit 2.0)))
;;; modulo
(defun mod (x y)
(setq y (float y))
(round (* y
(- (/ x y)
(truncate (/ x y))))))
;;; convert to hh:mm:ss
(defun to-hhmmss (seconds)
(let* ((hh (truncate (/ seconds 3600)))
(mm (truncate (/ (mod seconds 3600) 60)))
(ss (mod seconds 60)))
(format nil "~ah:~am:~as" hh mm ss)))
;;; convert to mono and limit sample rate
(defun convert (sig ratio)
(if (arrayp *track*)
(snd-avg
(s-max (snd-abs (aref sig 0))
(snd-abs (aref sig 1)))
ratio ratio op-peak)
(snd-avg sig ratio ratio op-peak)))
(defun clips-selected ()
"Bool. Return true if audio clips selected."
(let ((clips (get '*track* 'clips))
(start (time-to-samples (get '*selection* 'start)))
(end (time-to-samples (get '*selection* 'end)))
start-found
end-found)
(if (arrayp clips)(setf clips (append (aref clips 0)(aref clips 1))))
(dotimes (i (length clips) (or start-found end-found))
(if (and (>= (time-to-samples (first (nth i clips))) start)
(< (time-to-samples (first (nth i clips))) end))
(if end-found
(setf end-found nil)
(setf start-found t)))
(if (and (> (time-to-samples (second (nth i clips))) start)
(<= (time-to-samples (second (nth i clips))) end))
(setf end-found t))
(if (and (> (time-to-samples (first (nth i clips))) end)
(not start-found)
(not end-found))
(return nil)))))
(defun time-to-samples (time)
"Assumes that sample rate is track rate."
(truncate (+ 0.5 (* time *sound-srate*))))
(defun sound-srate (sig)
(if (arrayp sig)
(snd-srate (aref sig 0))
(snd-srate sig)))
;;; find silences
(defun find-sil (sig &optional (find-start t) (find-end t))
"Treturns (list start-offse, end-offset). If find-start/end
is false, start/end element will be zero"
(do ((val (snd-fetch sig) (snd-fetch sig))
(start 0)
(end 0)
(flag 0))
((not val) (list start end))
(if (not find-start) (setf flag 1))
(if (= flag 0)
;; count initial silence
(if (< val threshold)
(incf start)
(if find-end
(setq flag 1)
(return (list start 0))))
(if (not find-end)
(return (list start end))
;; count final silence
(if (< val threshold)
(incf end)
(setq end 0))))))
;;; Find the earliest valid start time and
;;; latest valid end time.
;;; If time is invalid, set the time to nil.
(defun get-clip-limits ()
"Return a list (start-time, end-time)"
(let ((clips (get '*track* 'clips))
(channels (get '*track* 'channels))
(start (get '*selection* 'start))
(end (get '*selection* 'end))
(limits (list nil nil)))
(if (< start 0) (throw 'error "Selection cannot start before time=0."))
(dotimes (chan-num channels limits)
(if (> channels 1)
(setf channel-clips (aref clips chan-num))
(setf channel-clips clips))
(setf update-limits
(do ((j 0 (1+ j))
start-limit
end-limit)
((= j (length channel-clips))
(list start-limit (if (and end-limit (> end-limit 0)) end-limit nil)))
;; look for start
(cond
((> (first (nth j channel-clips)) end) ; reached end of selection.
(return (list start-limit (if (and end-limit (> end-limit 0)) end-limit nil))))
((and (not start-limit) ;still looking for a clip start.
(>= (time-to-samples (first (nth j channel-clips))) (time-to-samples start)))
;; if we've found a clip end, selection starts is inside the clip. Start not valid
(if (not end-limit)
(setf start-limit (first (nth j channel-clips))))))
;; now look for end
(if (and (> (time-to-samples (second (nth j channel-clips))) (time-to-samples start))
(<= (time-to-samples (second (nth j channel-clips))) (time-to-samples end)))
; End of clip is after the selectuon start, and before or ar selection end.
(setf end-limit (second (nth j channel-clips))))
(if (and end-limit
(< (time-to-samples (first (nth j channel-clips))) (time-to-samples end))
(> (time-to-samples (second (nth j channel-clips))) (time-to-samples end)))
; the end of this clip is not valid,
; but we need to know that an end has been found.
(setf end-limit -1))))
;; Update limits
(case chan-num
(0 (setf limits update-limits))
(T
(if (or (not (nth 0 limits)) (not (nth 0 update-limits)))
(setf (nth 0 limits) nil)
(setf (nth 0 limits)(min (nth 0 limits)(nth 0 update-limits))))
(if (or (not (nth 1 limits))(not (nth 1 update-limits)))
(setf (nth 1 limits) nil)
(setf (nth 1 limits)(max (nth 1 limits)(nth 1 update-limits)))))))))
(defmacro abs-to-relative-time (time)
"Convert absolute time to time relative to selection start"
`(setf ,time (- ,time (get '*selection* 'start))))
(defun add-num-suffix (num)
(let ((num (truncate num))
(last-digit (rem num 10)))
(case last-digit
(1 (format nil "~ast" num))
(2 (format nil "~and" num))
(3 (format nil "~ard" num))
(t (format nil "~ath" num)))))
(defun trim-silence ()
;; Nyquist plug-ins cannot return 'no audio', so trap as error.
(if (< (get '*selection* 'peak-level) threshold)
(throw 'error (format nil "Error.~%All selected audio in the ~a selected track~%~
is below the silence threshold.~%~%~
Try setting the threshold to a~%~
lower (more negative) dB level."
(add-num-suffix (get '*track* 'index)))))
(if (> len (* limit *sound-srate*)) ;max length in samples
(throw 'error (format nil "Error.\nMax RAM usage by Trim Silence is set to ~a GB.~%This allows a maximum duration ~
for a ~a~%track at ~a Hz of ~a.~%Selected track is ~a.~%"
RAM-limit
(if (arrayp *track*) "stereo" "mono")
(round *sound-srate*)
(to-hhmmss limit)
(to-hhmmss (get-duration 1)))))
(let* (;; ratio provides tighter trimming for short selections
;; while maintaining reasonable speed for long selections
(ratio (max 10 (min 200 (round (/ len 100000.0)))))
(my-srate (/ *sound-srate* ratio))
(mysound (convert *track* ratio))
(limits (get-clip-limits)) ; (list start, end) times of audio clips
(clip-start (if (first limits)
(abs-to-relative-time (nth 0 limits)))) ; nil id invalid
(clip-end (if (second limits)
(abs-to-relative-time (nth 1 limits))))) ; nil if invalid
;loop through samples and mark start and end
(setf result (find-sil mysound clip-start clip-end))
(let ((start (if clip-start
(max clip-start
(- (/ (first result) my-srate) min-start-silence))
0))
(end (if clip-end
(min (+ (- (get-duration 1) (/ (second result) my-srate))
min-end-silence)
clip-end)
(get '*selection* 'end))))
;; ensure at least 1 sample remains
;; This should never happen.
(if (>= start end)
(setq start (- end (/ *sound-srate*))))
; trim
(multichan-expand #'extract-abs start end (cue *track*)))))
(if (clips-selected)
(catch 'error (trim-silence))
nil)