mirror of
https://github.com/cookiengineer/audacity
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66 lines
2.6 KiB
Common Lisp
66 lines
2.6 KiB
Common Lisp
;nyquist plug-in
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;version 4
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;type process spectral
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;preview linear
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;name "Spectral edit parametric EQ..."
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;manpage "Spectral_edit_parametric_EQ"
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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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;; SpectralEditParametricEQ.ny by Paul Licameli, November 2014.
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;; Updated by Steve Daulton 2014 / 2015.
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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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;control control-gain "Gain (dB)" real "" 0 -24 24
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(defun wet (sig gain fc bw)
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(eq-band sig fc gain (/ bw 2)))
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(defun result (sig)
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(let*
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((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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(bw (get '*selection* 'bandwidth))
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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)) ; This should never happen for a 'spectral' effect.
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(throw 'error-message (format nil "~aPlease select frequencies." p-err)))
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((not f0)
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(throw 'error-message (format nil "~aLow frequency is undefined." p-err)))
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((not f1)
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(throw 'error-message (format nil "~aHigh frequency is undefined." p-err)))
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((and fc (= fc 0))
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(throw 'error-message (format nil "~aCenter frequency must be above 0 Hz." p-err)))
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((and f1 (> f1 (/ *sound-srate* 2)))
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(throw 'error-message
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(format nil "~aFrequency selection is too high for track sample rate.
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For the current track, the high frequency setting cannot~%~
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be greater than ~a Hz"
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p-err (/ *sound-srate* 2))))
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((and bw (= bw 0))
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(throw 'error-message
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(format nil "~aBandwidth is zero (the upper and lower~%~
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frequencies are both ~a Hz).~%~
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Please select a frequency range."
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p-err f0)))
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;; If centre frequency band is above Nyquist, do nothing.
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((and fc (>= fc (/ *sound-srate* 2.0)))
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nil)
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(t (sum (prod env (wet sig control-gain fc bw))
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(prod (diff 1.0 env) sig))))))
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(catch 'error-message
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(setf p-err "Error.\n")
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(if (= control-gain 0)
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nil ; Do nothing
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(multichan-expand #'result *track*)))
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