static   xtlang


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

Implementation

;; a rough and ready granulator
;; expects to work on 'n' channels
;; see examples/external/granular.xtm
;; or examples/core/granular.xtm
;; more expensive than linear
(bind-func static granulator_hermite_c
  (lambda (channels)
    (let ((idx 0)
          (iot 2000)
          (iotn 100000000) ;; we want a grain right at the start
          (dlo 5000.0)
          (dhi 5000.0)
          (rlo 1.0)
          (rhi 1.0)
          (plo 0.5)
          (phi 0.5)
          (alo 0.2)
          (ahi 0.2)
          (wet 1.0)
          (PI2:double (* 2.0 3.141592))
          (gidx 0)
          (offset 0)
          (y1 0.0) (x0 0.0) (x1 0.0) (x2 0.0)
          (out:SAMPLE 0.0) (i 0)
          (cachesize:i64 (* 88200 2 channels))
          (cnt cachesize)
          (audio_cache:SAMPLE* (alloc cachesize))
          (lengths:|200,double|* (alloc))
          (durations:|200,double|* (alloc))
          (phases:|200,double|* (alloc))
          (startidx:|200,i64|* (alloc))
          (amps:|200,float|* (alloc))
          (rates:|200,double|* (alloc))
          (panning:|200,float|* (alloc))
          (active:|200,i1|* (alloc)))
      (dotimes (i 200) (aset! active i 0))
      (lambda (chan time:i64 in)
        (set! iotn (+ iotn 1))
        (pset! audio_cache (% cnt cachesize) in)
        (if (and (>= iotn iot)
                 (= chan 0))
            (begin
              (set! iotn 0)
              (aset! active gidx 1)
              (aset! lengths gidx (+ dlo (* (- dhi dlo) (random))))
              (aset! amps gidx (+ alo (* (- ahi alo) (random))))
              (aset! panning gidx (+ plo (* (- phi plo) (random))))
              (aset! durations gidx (aref lengths gidx))
              (aset! rates gidx (+ rlo (* (- rhi rlo)  (random))))
              (set! offset
                    (if (> (aref rates gidx) 1.0)
                        (+ 128
                           (* channels (dtoi64 (floor (- (* (aref rates gidx)
                                                            (aref lengths gidx))
                                                         (aref lengths gidx))))))
                        128))
              (aset! startidx gidx (% (- cnt offset) cachesize))
              (aset! phases gidx 0.0)
              (set! gidx (% (+ gidx 1) 200))))
        (set! cnt (+ cnt 1))
        (set! out 0.0)
        (dotimes (i 200)
          (if (= 1:i1 (aref active i))
              (begin
                (set! idx (+ (aref startidx i)
                             chan
                             (* channels (dtoi64 (floor (aref phases i))))))
                (set! y1 (pref audio_cache (% (- idx channels) cachesize)))
                (set! x0 (pref audio_cache (% idx cachesize)))
                (set! x1 (pref audio_cache (% (+ idx channels) cachesize)))
                (set! x2 (pref audio_cache (% (+ idx (* 2 channels)) cachesize)))
                (set! out (+ out
                             (* (aref amps i)
                                (dtof (* 0.5 (- 1.0 (cos (* PI2 (/ (aref durations i) (aref lengths i)))))))
                                (panner chan (aref panning i))
                                (hermite_interp (dtof (modulo (aref phases i) 1.0)) y1 x0 x1 x2))))
                (if (= chan 0)
                    (begin
                      (aset! phases i (+ (aref phases i) (aref rates i)))
                      (aset! durations i (- (aref durations i) (aref rates i)))))
                (if (< (aref durations i) 8.0)
                    (begin
                      (aset! active i 0)
                      void)
                    void))))
        (+ (* (- 1.0 wet) in)
           (* wet out))))))


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