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https://github.com/cookiengineer/audacity
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145 lines
4.8 KiB
Common Lisp
145 lines
4.8 KiB
Common Lisp
;nyquist plug-in
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;version 3
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;type analyze
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;categories "http://audacityteam.org/namespace#TimeAnalyser"
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;name "Regular Interval Labels..."
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;action "Adding equally-spaced labels to the label track..."
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;info "By David R. Sky, http://www.garyallendj.com/davidsky/index.html, after Alex S.Brown.\nReleased under GPL v2."
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;control start "Time to place first label [seconds]" string " " "0.0"
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;control placement "Label placement method" choice "Label interval,Number of labels" 0
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;control time "Set either: Label interval [seconds]" string " " "60.0"
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;control label-number "Or: Number of labels" int "" 10 2 100
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;control text "Label text" string "" "Label"
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;control prepend "Prepend numbers to label text?" choice "No - just use text,Yes" 1
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;control include "Include final label?" choice "No,Yes" 0
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;control t-choice "Final audio segment equal with others?" choice "No,Yes" 1
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; Regular interval labels by David R. Sky, June-October 2007.
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; Code for label placement based on silencemarker.ny by Alex S.Brown.
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; Modified by Steve Daulton, September 2010 to disallow labels before zero.
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; Released under terms of the GNU General Public License version 2
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; http://www.gnu.org/copyleft/gpl.html .
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; Thanks Sami Jumppanen for plug-in suggestion.
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; Thanks Dominic Mazzoni, Pierre M.I., Gale Andrews
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; for improvement suggestions.
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; function to convert string to list
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(defun string-to-list (str)
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(read (make-string-input-stream (format nil "(~a)" str))))
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; convert start string to a number
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(setf start (first (string-to-list start)))
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(setq start (max 0 start)) ; disallow negative label time
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; convert time string to a number
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(setf time (first (string-to-list time)))
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; get selection duration in seconds,
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; then subtract start offset
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(setf dur (- (/ len *sound-srate*) start))
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; give an error message
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; if user-set label interval is greater than selection duration,
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; taking into accound start time offset
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(cond ; outermost cond
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((and (> time dur) (= placement 0))
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(format nil
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"Including your time offset of ~a seconds, your requested~%label interval of ~a seconds is greater than the duration~%of your selected audio (~a seconds). ~%
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Please run this plug-in again using a smaller label interval. ~%"
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start time dur))
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(t ; label interval time is equal to or less than selection duration
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; choose between user-selected label interval or number of labels
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(cond
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((= placement 1) ; number of labels
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(setf time (if (= include 0)
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(float (/ dur label-number)) (1+ (float (/ dur label-number)))))
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(setf labels (if (= include 0) label-number (1+ label-number)))
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) ; end placement 1
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(t ; user-selected time interval
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; calculate number of labels in selection
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; this includes label at start of selection
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; which is label number 0 if numbers are prepended to label text
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; if final label is unwanted, decrement number of labels by 1
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(setf labels (if (= include 0)
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(truncate (/ dur time))
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(+ 1 (truncate (/ dur time)))
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) ; end if
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) ; end setf labels
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; setf check-labels: number of labels if user includes last label
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; this is for checking purposes in the [setf time ...] section of code
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(setf check-labels (+ 1 (truncate (/ dur time))))
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; function to calculate new time value
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; if user value does not create equal duration final audio chunk
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; returns new time value
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(defun new-time (time dur check-labels)
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; calculate duration of last audio chunk
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(setf last-label (- dur (* time check-labels)))
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(if (< last-label (* time 0.5)) ; last chunk is less than 1/2 time
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(/ dur (- check-labels 1))
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(/ dur check-labels)
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) ; end if
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) ; end defun new-time
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(setf time ; depending whether user wants specified time used
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; or wants equal duration audio chunks including last chunk
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; user time may create equal audio chunks even for last chunk
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(cond ; 1
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((= t-choice 0) time) ; use user time value...
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(t ; ...otherwise calculate time for equal duration audio chunks
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(cond ; 2
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; if user time value creates equal final audio segment duration anyway
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; then use user interval
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((= dur (* time (- check-labels 1))) time)
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; user time value does not create equal duration audio chunks
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(t
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(new-time time dur check-labels)
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) ; end t
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) ; end cond 2
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) ; end of calculation for equal duration audio chunks
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) ; end cond1
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) ; end setf time
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) ; end t
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) ; end cond choosing between user-set label interval or number of labels
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; function to add labels to the label track
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; from silencemarker.ny by Alex S. Brown
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(defun add-label (l-time l-text)
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(setq l (cons (list l-time l-text) l)))
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; function to prepend label number before label text
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(defun prepend-number (i text)
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(format nil "~a~a" i text))
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; initialize blank label track
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(setq l nil)
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; add the labels
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(dotimes (i labels)
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(if (= prepend 1) ; prepend numbers to label text?
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(add-label (+ start (* i time)) (prepend-number i text)) ; yes
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(add-label (+ start (* i time)) text) ; no
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) ; end if
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) ; end dotimes i
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; return label track
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l
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) ; close t of outermost cond
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) ; end outermost cond
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