82 lines
1.9 KiB
Scheme
82 lines
1.9 KiB
Scheme
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;; (convolution2 in bufnum trigger framesize)
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Strict convolution with fixed kernel which can be updated using a
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trigger signal.
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in - processing target
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bufnum - buffer index for the fixed kernel, may be modulated in
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combination with the trigger
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trigger - update the kernel on a change from <=0 to >0
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framesize - size of fft frame, must be a power of two. convolution
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uses twice this number internally, maximum value you
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can give this argument is 2^16=65536. Note that it gets
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progressively more expensive to run for higher powers!
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512, 1024, 2048, 4096 standard.
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|#
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(with-sc3
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(lambda (fd)
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(for-each
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(lambda (b)
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(async fd (b-alloc b 2048 1)))
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(list 10 11 12))
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(for-each
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(lambda (n)
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(send fd (b-set1 10 (+ (* 400 n) 100) 1)))
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(enum-from-to 0 2))
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(for-each
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(lambda (n)
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(send fd (b-set1 11 (+ (* 20 n) 10) (random 0 1))))
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(enum-from-to 0 49))
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(for-each
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(lambda (n)
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(send fd (b-set1 12 (+ (* 40 n) 20) 1)))
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(enum-from-to 0 19))
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(send-synth
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fd "c"
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(letc ((k 0) (t 0))
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(let ((i (impulse ar 1 0)))
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(out 0 (mul (convolution2 i k t 2048) 0.5)))))))
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(define send-to
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(lambda (m)
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(with-sc3
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(lambda (fd)
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(send fd m)))))
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(define async-to
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(lambda (m)
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(with-sc3
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(lambda (fd)
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(async fd m)))))
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(send-to (s-new1 "c" 1001 1 1 "k" 10))
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(send-to (n-set1 1001 "k" 11))
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(send-to (n-set1 1001 "t" 0))
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(send-to (n-set1 1001 "t" 1))
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(send-to (n-set1 1001 "k" 12))
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(send-to (n-set1 1001 "t" 0))
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(send-to (n-set1 1001 "t" 1))
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(async-to (b-zero 12))
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(for-each
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(lambda (n)
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(send-to (b-set1 12 (+ (* 20 n) 10) 1)))
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(enum-from-to 0 39))
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(send-to (n-set1 1001 "t" 0))
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(send-to (n-set1 1001 "t" 1))
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;; With soundfile.
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(async-to (b-alloc-read 10 "/home/rohan/audio/metal.wav" 0 0))
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(let ((i (sound-in 0)))
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(audition (out 0 (mul (convolution2 i 10 0 512) 0.5))))
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