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https://github.com/cookiengineer/audacity
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65f1bbe449
... by passing invalid frequency values, rather than by checking the 'view property in each effect. Spectral editing is now permitted only for appropriate track view types. But I would suggest reconsideration of the exact conditions in which we do this.
50 lines
1.8 KiB
Common Lisp
50 lines
1.8 KiB
Common Lisp
;nyquist plug-in
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;version 4
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;type process
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;name "Spectral edit multi tool"
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;action "Filtering..."
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;author "Paul Licameli"
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;copyright "Released under terms of the GNU General Public License version 2"
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;; SpectralEditMulti.ny by Paul Licameli, November 2014.
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;; Updated to version 4 by Steve Daulton November 2014.
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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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(defun wet (sig f0 f1 fc)
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(cond
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((not f0) (highpass2 sig f1))
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((not f1) (lowpass2 sig f0))
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(T (let ((q (/ fc (- f1 f0))))
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(notch2 sig fc q)))))
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(defun result (sig)
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(let* ((f0 (get '*selection* 'low-hz))
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(f1 (get '*selection* 'high-hz))
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(fc (get '*selection* 'center-hz))
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(tn (truncate len))
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(rate (snd-srate sig))
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(transition (truncate (* 0.01 rate))) ; 10 ms
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(t1 (min transition (/ tn 2))) ; fade in length (samples)
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(t2 (max (- tn transition) (/ tn 2))) ; length before fade out (samples)
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(breakpoints (list t1 1.0 t2 1.0 tn))
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(env (snd-pwl 0.0 rate breakpoints)))
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(cond
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((not (or f0 f1)) (throw 'error-message "Please select frequencies."))
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((and f0 f1 (= f0 f1)) (throw 'error-message
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"Bandwidth is zero.\nPlease select a frequency range."))
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;; low pass frequency is above Nyquist so do nothing
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((and (not f1) (>= f0 (/ *sound-srate* 2.0)))
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nil)
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;; notch frequency is above Nyquist so do nothing
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((and (and f0 f1) (>= fc (/ *sound-srate* 2.0)))
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nil)
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;; high-pass above Nyquist so fade to silence
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((and (not f0) (>= f1 (/ *sound-srate* 2.0)))
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(mult sig (diff 1.0 env)))
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(T (sum (prod env (wet sig f0 f1 fc))
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(prod (diff 1.0 env) sig))))))
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(catch 'error-message
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(multichan-expand #'result *track*))
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