55 lines
1.6 KiB
Racket
55 lines
1.6 KiB
Racket
#lang scribble/manual
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@(require (for-label racket))
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@title{(warp1 nc buf ptr freqScale windowSize envbuf overlaps windowrandRatio interp)}
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Warp a buffer with a time pointer
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inspired by Chad Kirby's SuperCollider2 warp1 class, which was
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inspired by Richard Karpen's sndwarp for CSound. A granular time
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strecher and pitchshifter.
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nc - the number of channels in the soundfile used in bufnum.
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buf - the buffer number of a mono soundfile.
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ptr - the position in the buffer. The value should be between 0
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and 1, with 0 being the begining of the buffer, and 1 the
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end.
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freqScale - the amount of frequency shift. 1.0 is normal, 0.5 is
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one octave down, 2.0 is one octave up. Negative values
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play the soundfile backwards.
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windowSize - the size of each grain window.
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envbuf - the buffer number containing a singal to use for the grain
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envelope. -1 uses a built-in Hanning envelope.
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overlaps - the number of overlaping windows.
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windowrandRatio - the amount of randomness to the windowing
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function. Must be between 0 (no randomness) to
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1.0 (probably to random actually)
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interp - the interpolation method used for pitchshifting grains. 1
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= no interpolation. 2 = linear. 4 = cubic interpolation
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(more computationally intensive).
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@racketblock[
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(with-sc3
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(lambda (fd)
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(async fd (b-alloc-read 10 "/home/rohan/audio/metal.wav" 0 0))))
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]
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@racketblock[
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(let* ((p (lin-lin (lf-saw kr 0.05 0) -1 1 0 1))
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(x (mouse-x kr 0.5 2 0 0.1))
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(w (warp1 1 10 p x 0.1 -1 8 0.1 2)))
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(audition (out 0 w)))
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]
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