406cc7c0c7
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>
22 lines
706 B
Common Lisp
22 lines
706 B
Common Lisp
;; beat-alternate construct
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;; Alternates between sources on each beat
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;;
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;; Usage in recipe:
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;; (construct beat-alternate :path "constructs/beat-alternate.sexp")
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;; (def segments (beat-alternate beats-data (list video-a video-b)))
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(define-construct beat-alternate
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"Alternate between sources on each beat"
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(analysis sources)
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;; Body: map over time pairs, return segment descriptors
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(let [times (get analysis :times)
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pairs (zip-pairs (cons 0 times))
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n-sources (len sources)]
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(map-indexed
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(fn [i pair]
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(dict :source (nth sources (mod i n-sources))
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:start (first pair)
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:end (nth pair 1)
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:effects (list)))
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pairs)))
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