95fcc67dcc
- Add stream_sexp_generic.py: fully generic sexp interpreter - Add streaming primitives for video sources and audio analysis - Add config system for external sources and audio files - Add templates for reusable scans and macros - Fix video/audio stream mapping in file output - Add dynamic source cycling based on sources array length - Remove old Python effect files (migrated to sexp) - Update sexp effects to use namespaced primitives Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
20 lines
696 B
Common Lisp
20 lines
696 B
Common Lisp
;; Echo effect - motion trails using frame buffer
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(require-primitives "blending")
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(define-effect echo
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:params (
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(num_echoes :type int :default 4 :range [1 20])
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(decay :type float :default 0.5 :range [0 1])
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)
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(let* ((buffer (state-get 'buffer (list)))
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(new-buffer (take (cons frame buffer) (+ num_echoes 1))))
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(begin
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(state-set 'buffer new-buffer)
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;; Blend frames with decay
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(if (< (length new-buffer) 2)
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frame
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(let ((result (copy frame)))
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;; Simple blend of first two frames for now
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;; Full version would fold over all frames
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(blending:blend-images frame (nth new-buffer 1) (* decay 0.5)))))))
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