static   xtlang


Defined in:  https://github.com/digego/extempore/tree/v0.8.9/libs/core/audio_dsp.xtm

Implementation

;; pan around 'n' channels
;; with a bleed to surrounding channels.
;;
;; the 1st speaker (channel) is pan 0.0
;; the 2nd speaker           is pan 1.0
;; etc..
;; the last speaker          is pan (- n 1.0)
;; it is legal to pan past (- n 1.0) to n
;; this makes it possible to pan between the
;; last speaker and the first speaker
;;
;; for example: assuming 4 channels
;; (pan chan in 1.0 (% pos 4.0))
;; would pan around a circle of 4 speakers
;;
;; the amount of 'bleed' is the amount of bleed
;; between speakers.  A bleed of 4.0 with 4.0 channels
;; would mean all speakers would always be sounding.
;; A bleed of less than 0.5 would ensure that only one
;; speaker at a time will ever be sounding.
;;
(bind-func static pan_c
  (lambda (chans)
    (let ((fchans (i64tof (+ chans 0)))
          (fchan 0.0)
          (chk 0)
          (p1 0.0) (p2 0.0) (p3 0.0)
          (b1 0.0) (b2 0.0))
      (lambda (chan in bleed pan)
        (set! fchan (i64tof chan))
        (set! p1 pan)
        (set! p2 (- pan fchans))
        (set! p3 (+ pan fchans))
        (set! b1 (- fchan bleed))
        (set! b2 (+ fchan bleed))
        (cond ((and (> p1 b1) (< p1 b2)) (* in (/ 1.0 bleed) (- bleed (fabs (- fchan p1)))))
              ((and (> p2 b1) (< p2 b2)) (* in (/ 1.0 bleed) (- bleed (fabs (- fchan p2)))))
              ((and (> p3 b1) (< p3 b2)) (* in (/ 1.0 bleed) (- bleed (fabs (- fchan p3)))))
              (else 0.0))))))


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