138 lines
4.8 KiB
Common Lisp
138 lines
4.8 KiB
Common Lisp
$nyquist plug-in
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$version 4
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$type tool
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$name (_ "Regular Interval Labels")
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$manpage "Regular_Interval_Labels"
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$action (_ "Adding equally-spaced labels to the label track...")
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$author (_ "Steve Daulton")
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$release 2.3.0
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$copyright (_ "Released under terms of the GNU General Public License version 2")
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;; Original version by David R. Sky (http://www.garyallendj.com/davidsky/) 2007.
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;; Based on an idea by Sami Jumppanen, with contributions from
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;; Alex S.Brown, Dominic Mazzoni, Pierre M.I., Gale Andrews, Steve Daulton.
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;; This version by Steve Daulton (http://easyspacepro.com) 2016
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;; Released under terms of the GNU General Public License version 2:
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;; http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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;;
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;; For information about writing and modifying Nyquist plug-ins:
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;; https://wiki.audacityteam.org/wiki/Nyquist_Plug-ins_Reference
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$control mode (_ "Use 'Number of labels' OR 'Label interval'") choice (
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("Number" (_ "Number of Labels"))
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("Interval" (_ "Label Interval"))
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) 0
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$control totalnum (_ "Number of labels") int-text "" 10 1 1000
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$control interval (_ "Label interval (seconds)") float-text "" 60 0.001 3600
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$control adjust (_ "Adjust label interval to fit length") choice (
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(_ "No")
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(_ "Yes")
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) 0
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$control labeltext (_ "Label text") string "" (_ "Label")
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$control zeros (_ "Minimum number of digits in label") choice (
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("TextOnly" (_ "None - Text Only"))
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("OneBefore" (_ "1 (Before Label)"))
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("TwoBefore" (_ "2 (Before Label)"))
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("ThreeBefore" (_ "3 (Before Label)"))
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("OneAfter" (_ "1 (After Label)"))
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("TwoAfter" (_ "2 (After Label)"))
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("ThreeAfter" (_ "3 (After Label)"))
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) 2
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$control firstnum (_ "Begin numbering from") int-text "" 1 0 nil
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(defun make-labels ()
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"Generate labels at regular intervals"
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(setf labels ())
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;; Get parameters
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(case mode
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(0 ;Number of Labels
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(setf interval (/ (get-duration 1) totalnum)))
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(1 (setf totalnum (get-interval-count))
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(when (= adjust 1)
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(setf interval (/ (get-duration 1) totalnum)))
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(check-number-of-labels)))
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;; Loop for required number of labels
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(do* ((count 0 (1+ count))
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(time 0 (* count interval)))
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((= count totalnum) labels)
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(push (make-one-label time (+ firstnum count)) labels)))
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(defun check-number-of-labels ()
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"Throw error if excessive number of labels ('Interval' mode only)"
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(when (> totalnum 1000)
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(throw 'err
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(format nil ("Too many labels.~%~%~
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Selection length is ~a seconds and~%~
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Label interval is ~a seconds~%~
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giving a total of ~a labels.~%~
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Maximum number of labels from this effect is 1000.~%~
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Please use a shorter selection, or a longer Label interval.")
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(formatgg (get-duration 1))
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(formatgg interval)
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(if (= adjust 1)
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(round (/ (get-duration 1) interval))
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(1+ (round (/ (get-duration 1) interval))))))))
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(defun get-interval-count ()
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"Number of labels when interval is specified"
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(case adjust
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;; Interval is user input value
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(0 (let ((n (truncate (/ (get-duration 1) interval))))
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(if (< (* n interval)(get-duration 1))
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(1+ n)
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n)))
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;; Adjust interval to fit length
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(1 (let* ((min-num (truncate (/ (get-duration 1) interval)))
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(max-num (1+ min-num)))
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(if (and (> min-num 0)
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(< (abs (- interval (/ (get-duration 1) min-num)))
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(abs (- interval (/ (get-duration 1) max-num)))))
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min-num
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max-num)))))
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(defun make-one-label (time num)
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"Make a single label"
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(let* ((num-text (format nil "~a" num))
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(non-zero-digits (length num-text)))
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(if (= zeros 0)
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(setf num-text "")
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(dotimes (i (max 0 (- zeros non-zero-digits)))
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(setf num-text (format nil "~a~a" "0" num-text))))
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(if num-before-text
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(setf text (format nil "~a~a" num-text labeltext))
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(setf text (format nil "~a~a" labeltext num-text)))
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(list time text)))
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(defun lasttrackp ()
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"true when processing the final selected track"
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(let ((index (get '*track* 'index))
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(num (length (get '*selection* 'tracks))))
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(= index num)))
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(defun formatgg (num)
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"Similar to float-format %g but more decimal places"
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(cond
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((/= num (truncate num)) ; not integer
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(setf *float-format* "%.5f")
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(let ((numtxt (format nil "~a" num)))
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(do* ((i (1- (length numtxt)) (1- i))
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(ch (char numtxt i)(char numtxt i)))
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((char/= ch #\0))
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(setf numtxt (subseq numtxt 0 i)))
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(setf *float-format* "%g")
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numtxt))
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(t num)))
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(setf num-before-text (<= zeros 3))
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(setf zeros (1+ (rem (1- zeros) 3)))
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;; Analyze plug-ins may return text message per track but
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;; we only want error messages once, and only one set of labels.
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(if (lasttrackp)
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(catch 'err (make-labels))
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nil)
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