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https://github.com/cookiengineer/audacity
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260 lines
10 KiB
Common Lisp
260 lines
10 KiB
Common Lisp
$nyquist plug-in
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$version 4
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$type analyze
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;i18n-hint: Name of effect that labels sounds
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$name (_ "Label Sounds")
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$manpage "Label_Sounds"
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$debugbutton false
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;; As this is a new plug-in (Jan2021), display errors if they occur.
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$debugflags trace
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$author (_ "Steve Daulton")
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$release 3.0.2
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$copyright (_ "Released under terms of the GNU General Public License version 2 or later.")
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;; Released under terms of the GNU General Public License version 2 or later:
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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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$control threshold (_ "Threshold level (dB)") float "" -30 -100 0
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$control measurement (_ "Threshold measurement") choice (("peak" (_ "Peak level"))
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("avg" (_ "Average level"))
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("rms" (_ "RMS level"))) 0
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$control sil-dur (_ "Minimum silence duration") time "" 1 0.01 3600
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$control snd-dur (_ "Minimum label interval") time "" 1 0.01 7200
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$control type (_ "Label type") choice (("before" (_ "Point before sound"))
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("after" (_ "Point after sound"))
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("around" (_ "Region around sounds"))
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("between" (_ "Region between sounds"))) 2
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$control pre-offset (_ "Maximum leading silence") time "" 0 0 nil
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$control post-offset (_ "Maximum trailing silence") time "" 0 0 nil
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;i18n-hint: Do not translate '##1'
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$control text (_ "Label text") string "" (_ "Sound ##1")
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(setf threshold (db-to-linear threshold))
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(setf max-labels 10000) ;max number of labels to return
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(defun format-time (s)
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;;; format time in seconds as h m s.
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;;; (Only used for error message if selection > 2^31 samples.)
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(let* ((hh (truncate (/ s 3600)))
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(mm (truncate (/ s 60))))
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;i18n-hint: hours minutes and seconds. Do not translate "~a".
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(format nil (_ "~ah ~am ~as")
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hh (- mm (* hh 60)) (rem (truncate s) 60))))
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(defun parse-label-text (txt)
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;;; Special character '#' represents an incremental digit.
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;;; Return '(digits num pre-txt post-txt) for
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;;; (number-of-digits, initial-value, text-before-number, text-after-number),
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;;; or NIL.
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;;; 'initial-value' is a positive integer or zero (default).
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;;; Only the first instance of #'s are considered 'special'.
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(let ((hashes 0)
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(num nil)
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(negative nil)
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(pre-txt "")
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(post-txt "")
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ch)
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(dotimes (i (length txt))
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(setf ch (char txt i))
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(cond
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((and (string= post-txt "") (char= ch #\#))
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(incf hashes))
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((and (> hashes 0) (string= post-txt ""))
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(cond
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((digit-char-p ch)
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(if num
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(setf num (+ (* num 10) (digit-char-p ch)))
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(setf num (digit-char-p ch))))
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((and (not num)(char= ch #\-))
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(setf negative t))
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(t (setf post-txt (string ch)))))
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((= hashes 0) ;special '#' not yet found
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(string-append pre-txt (string ch)))
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(t ;run out of #'s and digit characters.
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(string-append post-txt (string ch)))))
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(when negative
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(setf num (- num)))
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;; Replace string literal hash characters.
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(when (and (> hashes 0) (not num))
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(dotimes (i hashes)
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(string-append pre-txt "#")))
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(list hashes num pre-txt post-txt)))
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(defun pad (n d)
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;;; Return string, int 'n' padded to 'd' digits, or empty string.
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;;; Used in formatting label text.
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(cond
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(n
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(let ((negative (minusp n))
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(n (format nil "~a" (abs n))))
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(while (< (length n) d)
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(setf n (format nil "0~a" n)))
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(if negative
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(format nil "-~a" n)
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n)))
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(t "")))
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(defun to-mono (sig)
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;;; Coerce sig to mono.
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(if (arrayp sig)
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(s-max (s-abs (aref sig 0))
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(s-abs (aref sig 1)))
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sig))
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(defun to-avg-mono (sig)
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;;; Average of stereo channels
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(if (arrayp sig)
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(mult 0.5 (sum (aref sig 0)(aref sig 1)))
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sig))
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(defun reduce-srate (sig)
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;;; Reduce sample rate to (about) 100 Hz.
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(let ((ratio (round (/ *sound-srate* 100))))
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(cond
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((= measurement 0) ;Peak
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(let ((sig (to-mono sig)))
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(snd-avg sig ratio ratio OP-PEAK)))
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((= measurement 1) ;Average absolute level
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(let ((sig (to-avg-mono (s-abs sig))))
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(snd-avg sig ratio ratio OP-AVERAGE)))
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(t ;RMS
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(if (arrayp sig)
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;; Stereo RMS is the root mean of all (samples ^ 2) [both channels]
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(let* ((sig (mult sig sig))
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(left-mean-sq (snd-avg (aref sig 0) ratio ratio OP-AVERAGE))
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(right-mean-sq (snd-avg (aref sig 1) ratio ratio OP-AVERAGE)))
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(s-sqrt (mult 0.5 (sum left-mean-sq right-mean-sq))))
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(rms sig))))))
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(defun find-sounds (sig selection-start srate)
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;;; Return a list of sounds that are at least 'snd-dur' long,
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;;; separated by silences of at least 'sil-dur'.
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(let ((snd-list ())
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(sample-count 0)
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(sil-count 0)
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(snd-count 0)
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(snd-start 0)
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(label-count 0)
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;convert min sound duration to samples
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(snd-dur (* snd-dur srate))
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(sil-dur (* sil-dur srate)))
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;;Ignore samples before time = 0
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(when (< selection-start 0)
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(setf sample-count (truncate (* (abs selection-start) srate)))
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(dotimes (i sample-count)
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(snd-fetch sig)))
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;;Main loop to find sounds.
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(do ((val (snd-fetch sig) (snd-fetch sig)))
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((not val) snd-list)
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(cond
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((< val threshold)
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(when (and (>= sil-count sil-dur)(>= snd-count snd-dur))
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;convert sample counts to seconds and push to list.
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(push (list (/ snd-start srate)
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(/ (- sample-count sil-count) srate))
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snd-list)
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(incf label-count)
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(when (= label-count max-labels)
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(format t (_ "Too many silences detected.~%Only the first 10000 labels added."))
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(return-from find-sounds snd-list))
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(setf snd-count 0)) ;Pushed to list, so reset sound sample counter.
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(when (> snd-count 0) ;Sound is shorter than snd-dur, so keep counting.
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(incf snd-count))
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(incf sil-count))
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;; Above threshold.
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(t (when (= snd-count 0) ;previous sound was push, so this is a new sound.
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(setf snd-start sample-count))
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(setf sil-count 0)
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(incf snd-count)))
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(incf sample-count))
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;; Check for final sound
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(when (> snd-count 0)
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(push (list (/ snd-start srate)
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(/ (- sample-count sil-count) srate))
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snd-list))
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snd-list))
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(defun return-labels (snd-list)
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(setf text (parse-label-text text))
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; Selection may extend before t=0
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; Find t=0 relative to selection so we can ensure
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; that we don't create hidden labels.
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(setf t0 (- (get '*selection* 'start)))
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(setf t1 (- (get '*selection* 'end)))
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(let ((label-start t0)
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(label-end t1)
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(label-text "")
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(labels ())
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(final-sound (if (= type 3) 1 0)) ;type 3 = regions between sounds.
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;; Assign variable to parsed label text
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(digits (first text))
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(num (second text))
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(pre-txt (third text))
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(post-txt (fourth text)))
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;snd-list is in reverse chronological order
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(do ((i (1- (length snd-list)) (1- i)))
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((< i final-sound) labels)
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(case type
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(3 ;;label silences.
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(setf start-time (second (nth i snd-list)))
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(setf end-time (first (nth (1- i) snd-list)))
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;don't overlap next sound
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(setf label-start (min end-time (+ start-time pre-offset)))
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;don't overlap previous sound
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(setf label-end (max start-time (- end-time post-offset)))
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;ensure end is not before start
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(when (< (- label-end label-start) 0)
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(setf label-start (/ (+ label-end label-start) 2.0))
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(setf label-end label-start)))
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(t ;; labelling sounds
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(setf start-time (first (nth i snd-list)))
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(setf end-time (second (nth i snd-list)))
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;don't overlap t0 or previous sound.
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(setf label-start (max t0 label-start (- start-time pre-offset)))
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(setf label-end (+ end-time post-offset))
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;; Don't overlap following sounds.
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(when (> i 0)
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(setf label-end (min label-end (first (nth (1- i) snd-list)))))))
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(setf label-text (format nil "~a~a~a"
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pre-txt
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(pad num digits)
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post-txt))
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(case type
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(0 (push (list label-start label-text) labels)) ;point label before sound
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(1 (push (list label-end label-text) labels)) ;point label after sound
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(2 (push (list label-start label-end label-text) labels)) ;sound region
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(t (push (list label-start label-end label-text) labels)));silent region
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;Earliest allowed start time for next label.
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(setf label-start end-time)
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;num is either an int or nil
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(when num (incf num)))))
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;; Bug 2352: Throw error if selection too long for Nyquist.
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(let* ((sel-start (get '*selection* 'start))
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(sel-end (get '*selection* 'end))
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(dur (- sel-end sel-start))
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(samples (* dur *sound-srate*))
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(max-samples (1- (power 2 31))))
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(if (>= samples max-samples)
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;i18n-hint: '~a' will be replaced by a time duration
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(format nil (_ "Error.~%Selection must be less than ~a.")
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(format-time (/ max-samples *sound-srate*)))
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;; Selection OK, so run the analyzer.
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(let ((sig (reduce-srate *track*)))
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(setf *track* nil)
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(setf snd-list (find-sounds sig sel-start (snd-srate sig)))
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(cond
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((= (length snd-list) 0)
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(format nil (_ "No sounds found.~%Try lowering the 'Threshold' or reduce 'Minimum sound duration'.")))
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((and (= type 3) (= (length snd-list) 1))
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(format nil (_ "Labelling regions between sounds requires~%at least two sounds.~%Only one sound detected.")))
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(t
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(return-labels snd-list))))))
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