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(define-module (starlet playback)
#:use-module (oop goops)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-9)
#:use-module (starlet base)
#:export (make-playback cue load-cue!
cut-to-cue-number! run-cue-number! go!))
;; A "playback" is a state which knows how to run cues
;; from a cue list
(define-class <starlet-playback> (<starlet-state>)
(active-fade-list
#:init-value '()
#:getter get-active-fade-list
#:setter set-active-fade-list!)
(cue-list
#:init-keyword #:cue-list
#:getter get-playback-cue-list)
(rest-of-cue-list
#:init-value '()
#:getter get-rest-of-cue-list
#:setter set-rest-of-cue-list!)
(hash-table
#:allocation #:virtual
#:getter get-state-hash-table
#:slot-ref (lambda (instance)
(merge-active-fades (hirestime)
(get-active-fade-list instance)))
#:slot-set! (lambda (instance new-val)
(error "Can't set hash table on playback"))))
(define-record-type <fade>
(make-fade state start-frac target-frac fade-time fade-delay start-time)
fade?
(start-frac get-fade-start-frac)
(target-frac get-fade-target-frac)
(fade-time get-fade-time)
(state get-fade-state)
(start-time get-fade-start-time)
(fade-delay get-fade-delay-time))
(define-record-type <cue>
(make-cue number state up-time down-time up-delay down-delay)
cue?
(number get-cue-number)
(state get-cue-state)
(up-time up-time)
(up-delay up-delay)
(down-time down-time)
(down-delay down-delay))
(define (wrap-scale scale-factor a)
(lambda (time)
(* (value->number a time)
scale-factor)))
(define (get-current-fraction fade current-time)
(let ((elapsed-fade-time (- current-time
(get-fade-start-time fade)
(get-fade-delay-time fade))))
(cond
;; Before start of fade
((< elapsed-fade-time 0)
(get-fade-start-frac fade))
;; After end of fade
((> elapsed-fade-time
(get-fade-time fade))
(get-fade-target-frac fade))
;; During the fade
(else
(+ (get-fade-start-frac fade)
(* (- (get-fade-target-frac fade)
(get-fade-start-frac fade))
;; Fraction of fade time elapsed
(/ elapsed-fade-time
(get-fade-time fade))))))))
(define (scale-fade fade current-time)
(let ((state (make-empty-state))
(scale-factor (get-current-fraction fade current-time)))
(state-for-each (lambda (fix attr value)
(if (eq? 'intensity (get-attr-name attr))
(set-in-state! state
fix
attr
(wrap-scale scale-factor value))
(set-in-state! state fix attr value)))
(get-fade-state fade))
state))
(define (merge-active-fades current-time list-of-fades)
(get-state-hash-table
(merge-states-htp
(map (lambda (fade) (scale-fade fade current-time))
list-of-fades))))
(define (qnum a)
(/ (inexact->exact (* a 1000)) 1000))
(define* (cue number
state
#:key (fade-up 5) (fade-down 5) (up-delay 0) (down-delay 0))
(make-cue (qnum number)
state
fade-up
fade-down
up-delay
down-delay))
(define (make-playback cue-list)
(let ((new-playback (make <starlet-playback>
#:cue-list cue-list)))
new-playback))
(define (find-cue-tail cue-list cue-number)
(find-tail (lambda (a)
(eqv? (get-cue-number a)
cue-number))
cue-list))
(define (find-cue cue-list cue-number)
(car
(find-cue-tail cue-list
cue-number)))
(define (cut-to-cue-number! pb cue-number)
(let ((cue-tail (find-cue-tail (get-playback-cue-list pb)
cue-number)))
(cut-to-cue! pb (car cue-tail))
(set-rest-of-cue-list! pb (cdr cue-tail))))
(define (cut-to-cue! pb cue)
(let* ((state (expand-state (get-cue-state cue))))
;; Flush everything out and just set the state
(set-active-fade-list! pb
(list (make-fade
state
0.0 1.0 0.0 0.0 (hirestime))))))
(define (go! pb)
(let ((cue-tail (get-rest-of-cue-list pb)))
(unless (eq? '() cue-tail)
(run-cue! pb (car cue-tail))
(set-rest-of-cue-list! pb (cdr cue-tail)))))
;; else at the end of the cue list
(define (add-fade! pb fade)
(set-active-fade-list! pb
(cons fade
(get-active-fade-list pb))))
(define (make-fade-from-cue cue time)
(make-fade
(expand-state (get-cue-state cue))
0.0
1.0
(up-time cue)
(up-delay cue)
time))
(define (retire-old-fades! pb tnow)
(set-active-fade-list!
pb
(filter (lambda (a)
(or
(< tnow
(+ (get-fade-start-time a)
(get-fade-delay-time a)
(get-fade-time a)))
(> (get-fade-target-frac a)
0.0)))
(get-active-fade-list pb))))
(define (fade-down-all-active-states! pb tnow down-time down-delay)
(set-active-fade-list!
pb
(map (lambda (a)
(make-fade
(get-fade-state a)
(get-current-fraction a tnow)
0.0
down-time
down-delay
tnow))
(get-active-fade-list pb))))
(define (run-cue-number! pb cue-number)
(let ((cue-tail (find-cue-tail (get-playback-cue-list pb)
cue-number)))
(run-cue! pb (car cue-tail))
(set-rest-of-cue-list! pb (cdr cue-tail))))
(define (run-cue! pb cue)
(let ((tnow (hirestime)))
(retire-old-fades! pb tnow)
(fade-down-all-active-states! pb
tnow
(down-time cue)
(down-delay cue))
(add-fade! pb (make-fade-from-cue cue tnow))))
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