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