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Initial commit: video effects processing system

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Add S-expression based video effects pipeline with modular effect
definitions, constructs, and recipe files.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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gilesb
2026-01-19 12:34:45 +00:00
commit 406cc7c0c7
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sexp_effects/effects/scanlines.sexp Normal file
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;; Scanlines effect - VHS-style horizontal line shifting
;; @param amplitude float [0, 100] default 10
;; @param frequency float [1, 100] default 10
;; @param randomness float [0, 1] default 0.5
(define-effect scanlines
((amplitude 10) (frequency 10) (randomness 0.5))
(map-rows frame
(lambda (y row)
(let* ((sine-shift (* amplitude (sin (/ (* y 6.28) (max 1 frequency)))))
(rand-shift (random (- amplitude) amplitude))
(shift (floor (lerp sine-shift rand-shift randomness))))
(roll row shift 0)))))