/usr/share/audacity/plug-ins/equalabel.ny is in audacity-data 2.0.5-1ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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;version 3
;type analyze
;name "Regular Interval Labels..."
;action "Adding equally-spaced labels to the label track..."
;; by David R. Sky (http://www.garyallendj.com/davidsky/), June-October 2007.
;; Code for label placement based on silencemarker.ny by Alex S.Brown.
;; Updated by Steve Daulton (http://easyspacepro.com)
;; Released under terms of the GNU General Public License version 2
;; http://www.gnu.org/licenses/old-licenses/gpl-2.0.html .
;; Thanks Sami Jumppanen for plug-in suggestion.
;; Thanks Dominic Mazzoni, Pierre M.I., Gale Andrews
;; for improvement suggestions.
;; Disallow labels before zero by Steve Daulton, September 2010.
;; Enhanced label numbering by Steve Daulton, April 17th 2011.
;; Error checking by Steve Daulton, April 18th 2011.
;; Final Label bug fixed and minor GUI modifications. SD Apr 2011
;; Requires Audacity 1.3.4 or later.
;control start "Time to place first label [seconds]" string " " "0.0"
;control placement "Label placement method" choice "Label interval,Number of labels" 0
;control time "Set either: Label interval [seconds]" string " " "60.0"
;control label-number "Or: Number of labels" int "" 10 2 100
;control text "Label text" string "" "Label"
;control labelnum "Minimum number of digits in label" choice "None - text only,1 (before label),2 (before label),3 (before label),1 (after label),2 (after label),3 (after label)" 2
;control countfrom "Begin numbering from" int "" 1 0 100
;control include "Add final label" choice "No,Yes" 0
;control t-choice "Adjust label interval to fit length" choice "No,Yes" 1
; function to convert string to list
(defun string-to-list (str)
(read (make-string-input-stream (format nil "(~a)" str))))
; function to calculate new time value
; if user value does not create equal duration final audio chunk
; returns new time value
(defun new-time (time dur check-labels)
; calculate duration of last audio chunk
(setf last-label (- dur (* time check-labels)))
(if (< last-label (* time 0.5)) ; last chunk is less than 1/2 time
(/ dur (- check-labels 1))
(/ dur check-labels)))
; function to add labels to the label track
; from silencemarker.ny by Alex S. Brown
(defun add-label (l-time l-text)
(setq label-list (cons (list l-time l-text) label-list)))
; function to add label number
(defun add-number (i text)
(let* ((num (+ countfrom i))
(appendt (if (> labelnum 3) t nil))
(labelnum (if (> labelnum 3)(- labelnum 3) labelnum))
(sign (if (< num 0) "-" ""))
(num (abs num))
(zeros (case (- labelnum (length (format nil "~a" num)))
(1 "0")
(2 "00")
(t ""))))
(if appendt
(format nil "~a~a~a~a" text sign zeros num) ;append number to text
(format nil "~a~a~a~a" sign zeros num text)))) ;prepend number
; function to calculate 'time' based on number of labels
(defun num-of-label-time ()
(setf time (/ dur label-number)); set label interval
(if (= include 0)
(setf labels label-number)
(setf labels (1+ label-number))))
; function to calculate 'time' based on user-selected time interval
; calculate number of labels in selection
; this includes label at start of selection
; which is label number 0 if numbers are prepended to label text
; if final label is unwanted, decrement number of labels by 1
(defun user-selected-time ()
(setf labels (if (= include 0)
(truncate (/ dur time))
(+ 1 (truncate (/ dur time)))))
; setf check-labels: number of labels if user includes last label
(setf check-labels (+ 1 (truncate (/ dur time))))
; depending whether user wants specified time used
; or wants equal duration audio chunks including last chunk
; user time may create equal audio chunks even for last chunk
(setf time
(if (= t-choice 0) ; final segment need not be equal
time ; use user time value...
; ...otherwise calculate time for equal duration audio chunks
; if user time value creates equal final audio segment duration anyway
; then use user interval
(if (= dur (* time (- check-labels 1)))
time
; user time value does not create equal duration audio chunks
(new-time time dur check-labels)))))
;; ERROR CHECKING AND INITIALISE VARIABLES
(setq err ""); initialise error message
(setq label-list nil); initialize blank label track
(setq time (first (string-to-list time))); get Interval Label time from string
(setq start (first (string-to-list start))); get 'start' from string
; check 'start' is a valid number, then calculate and check 'dur(ation)'
(if (not(numberp start)) ; check that it is a number
(setq err (strcat err (format nil "'Time to place first label [seconds]' must be a number.~%~%")))
(progn
(setq start (max 0 start)) ;disallow negative label time
(setf dur (- (get-duration 1) start)) ;calculate duration
(if (<= dur 0)
(setq err (strcat err (format nil
"'Time to place first label' (~a seconds) is greater than selection length (~a seconds).~%~%"
start (get-duration 1)))))))
; If using 'Label Interval'
(if (= placement 0)
(if (not(numberp time)); check time is a number
(setq err (strcat err (format nil "'Label interval [seconds]' must be a number.~%~%")))
(if (<= time 0); Label interval must be positive
(setq err (strcat err (format nil "'Label Interval [seconds]' must be a positive number.~%~%")))
(if (and (> dur 0)(> time dur))
(setq err (strcat err (format nil
"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). ~%~%"
start time dur))))))
;else using 'Number of labels'
(if (<= label-number 0)
(setq err (strcat err (format nil
"Based on 'Number of labels' you have selected ~a labels.~%~%" label-number)))))
;; MAIN PROGRAM
(if (> (length err) 0) ; if errors
(format nil "ERROR.~%~%~a" err) ; print error message(s)
(progn ; otherwise run program
(if (= placement 1) ; number of labels
(num-of-label-time)
(user-selected-time))
; add the labels
(dotimes (i labels)
(if (> labelnum 0)
(add-label (+ start (* i time)) (add-number i text))
(add-label (+ start (* i time)) text)))
; return label track
label-list))
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