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Fix Adjustable Fade preview for stereo tracks

This commit is contained in:
Steve Daulton 2018-08-07 16:38:47 +01:00
parent 0c73bc1356
commit 0162badeff
1 changed files with 38 additions and 46 deletions
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84
plug-ins/adjustable-fade.ny
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@ -11,57 +11,49 @@ $author (_ "Steve Daulton")
$release 2.3.0
$copyright (_ "Released under terms of the GNU General Public License version 2")
;; adjustable-fade.ny by Steve Daulton Dec 2012
;; Released under terms of the GNU General Public License version 2:
;; http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
;;
;; For information about writing and modifying Nyquist plug-ins:
;; https://wiki.audacityteam.org/wiki/Nyquist_Plug-ins_Reference
$control type (_ "Fade Type") choice (
("Up" (_ "Fade Up"))
("Down" (_ "Fade Down"))
("SCurveUp" (_ "S-Curve Up"))
("SCurveDown" (_ "S-Curve Down"))
) 0
$control type (_ "Fade Type") choice (("Up" (_ "Fade Up"))
("Down" (_ "Fade Down"))
("SCurveUp" (_ "S-Curve Up"))
("SCurveDown" (_ "S-Curve Down"))) 0
$control curve (_ "Mid-fade Adjust (%)") real "" 0 -100 100
$control units (_ "Start/End as") choice (
("Percent" (_ "% of Original"))
("dB" (_ "dB Gain"))
) 0
$control units (_ "Start/End as") choice (("Percent" (_ "% of Original"))
("dB" (_ "dB Gain"))) 0
$control gain0 (_ "Start (or end)") float-text "" 0 nil nil
$control gain1 (_ "End (or start)") float-text "" 100 nil nil
$control preset (_ "Handy Presets (override controls)") choice (
("None" (_ "None Selected"))
("LinearIn" (_ "Linear In"))
("LinearOut" (_ "Linear Out"))
("ExponentialIn" (_ "Exponential In"))
("ExponentialOut" (_ "Exponential Out"))
("LogarithmicIn" (_ "Logarithmic In"))
("LogarithmicOut" (_ "Logarithmic Out"))
("RoundedIn" (_ "Rounded In"))
("RoundedOut" (_ "Rounded Out"))
("CosineIn" (_ "Cosine In"))
("CosineOut" (_ "Cosine Out"))
("SCurveIn" (_ "S-Curve In"))
("SCurveOut" (_ "S-Curve Out"))
) 0
$control preset (_ "Handy Presets (override controls)") choice (("None" (_ "None Selected"))
("LinearIn" (_ "Linear In"))
("LinearOut" (_ "Linear Out"))
("ExponentialIn" (_ "Exponential In"))
("ExponentialOut" (_ "Exponential Out"))
("LogarithmicIn" (_ "Logarithmic In"))
("LogarithmicOut" (_ "Logarithmic Out"))
("RoundedIn" (_ "Rounded In"))
("RoundedOut" (_ "Rounded Out"))
("CosineIn" (_ "Cosine In"))
("CosineOut" (_ "Cosine Out"))
("SCurveIn" (_ "S-Curve In"))
("SCurveOut" (_ "S-Curve Out"))) 0
;;; Preview takes the entire selection so that we know the correct
;;; selection length, but preview only needs to process preview length."
(defun get-input (sig)
"Preview takes the entire selection so that we know the correct
selection length, but preview only needs to process preview length."
;; (if *previewp* sig (multichan-expand #'trim-input sig)))
(if (get '*track* 'view) ;NIL if preview
sig
(multichan-expand #'trim-input sig)))
(if *previewp*
(multichan-expand #'trim-input sig)
sig))
;;; Trim input when previewing."
(defun trim-input (sig)
"Trim input when previewing."
(let ((dur (min (get-duration 1)
(get '*project* 'preview-duration))))
(setf sig (extract-abs 0 dur *track*))))
(setf sig (extract-abs 0 dur sig))))
;;; invalid values
(defun check-values (x y)
@ -77,7 +69,7 @@ selection length, but preview only needs to process preview length."
Hint: 6 dB doubles the amplitude~%~
\t-6 dB halves the amplitude." err)))))))
;;; select and apply fade
;;; Select and apply fade
(defun fade (sig type curve g0 g1)
(check-values gain0 gain1)
(mult (get-input sig)
@ -116,12 +108,12 @@ selection length, but preview only needs to process preview length."
(cos-curve g0 g1 (- 1.5 curve))) ; +ve curve > 0.5
(t (simple-curve g0 g1 (- 1 (* 2 curve)))))) ; -ve curve
;;; linear fade to the power of pow
;;; Linear fade to the power of 'pow'.
(defun simple-curve (g0 g1 pow)
(curve-adjust g0 g1 pow
(linear g0 g1)))
;;; cosine fade to the power of pow
;;; Cosine fade to the power of 'pow'.
(defun cos-curve (g0 g1 pow)
(curve-adjust g0 g1 pow
(cosine-curve g0 g1)))
@ -134,25 +126,25 @@ selection length, but preview only needs to process preview length."
(mult pow
(snd-log env))))))
;;; scale curves to min, max
;;; Scale curves to min, max.
(defun scale-curve (g0 g1 env)
(sum (min g0 g1)
(mult (abs (- g0 g1)) env)))
;;; cosine curve
;;; Cosine curve.
(defun cosine-curve (g0 g1)
(let ((step (hz-to-step (/ 0.25 (get-duration 1))))
(phase (if (> g0 g1) 90 0)))
(osc step 1 *sine-table* phase)))
;;; linear fade in, out
;;; Linear fade in, out.
(defun linear (g0 g1)
(control-srate-abs *sound-srate*
(if (> g0 g1) ; g0 = g1 does not occur here.
(pwlv 1 1 0) ; fade out
(pwlv 0 1 1)))) ; else fade in
;;; raised cosine fades
;;; Raised cosine fades.
(defun raised-cos (g0 g1 curve)
(setq curve
(if (> curve 0)
@ -172,7 +164,7 @@ selection length, but preview only needs to process preview length."
(sum (min g0 g1)
(mult (abs (- g0 g1)) env)))
;;; raised cosine curve
;;; Raised cosine curve.
(defun raised-cosin (phase)
(let ((hz (hz-to-step (/ (get-duration 2)))))
(mult 0.5
@ -180,7 +172,7 @@ selection length, but preview only needs to process preview length."
(osc hz 1 *sine-table* phase)))))
;;; log or exponential curve scaled 0 to 1
;;; x is the minimum level in dB before scaling
;;; x is the minimum level in dB before scaling.
(defun log-exp-curve (x direction)
(control-srate-abs *sound-srate*
(let ((x (db-to-linear x)))
@ -191,7 +183,7 @@ selection length, but preview only needs to process preview length."
(mult (/ (- 1 x)) ; normalize to 0 dB
(diff env x))))) ; drop down to silence
;;; curve scaling for S-curve
;;; Curve scaling for S-curve.
(defun exp-scale-mid (x)
(let ((e (exp 1.0)))
(/ (- (exp (- 1 x)) e)