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(define-module (guile-midi control)
#:use-module (oop goops)
#:use-module (ice-9 atomic)
#:use-module (ice-9 threads)
#:use-module (ice-9 binary-ports)
#:use-module (srfi srfi-1)
#:export (start-midi-control
make-midi-controller
get-controller-value
make-midi-led
set-midi-led!))
(define cc-list (make-atomic-box '()))
(define send-queue (make-atomic-box '()))
(define-class <midi-led> (<object>)
(channel
#:init-keyword #:channel
#:getter get-channel)
(note-number
#:init-keyword #:note-number
#:getter get-note-number))
(define-class <midi-control> (<object>)
(channel
#:init-keyword #:channel
#:getter get-channel)
(cc-number
#:init-keyword #:cc-number
#:getter get-cc-number)
(value-box
#:init-form (make-atomic-box 0)
#:getter get-value-box))
(define (get-controller-value a)
(atomic-box-ref (get-value-box a)))
(define* (make-midi-controller
#:key (channel 1) (cc-number 1))
(let ((new-controller (make <midi-control>
#:channel channel
#:cc-number cc-number)))
(atomic-box-set! cc-list
(cons new-controller
(atomic-box-ref cc-list)))
new-controller))
(define* (make-midi-led
#:key (channel 1) (note-number 1))
(let ((new-led (make <midi-led>
#:channel channel
#:note-number note-number)))
new-led))
(define enqueue-midi-bytes
(lambda bytes
(unless (eq? (atomic-box-compare-and-swap! send-queue '() bytes)
'())
(apply enqueue-midi-bytes bytes))))
(define (set-midi-led! led val)
(if val
;; Note on
(enqueue-midi-bytes (+ #b10010000 (get-channel led))
(get-note-number led)
127)
;; Note off
(enqueue-midi-bytes (+ #b10000000 (get-channel led))
(get-note-number led)
0)))
(define (handle-cc-change channel cc-number value)
(for-each (lambda (a)
(atomic-box-set! (get-value-box a) value))
(filter (lambda (a)
(and (eq? cc-number (get-cc-number a))
(eq? channel (get-channel a))))
(atomic-box-ref cc-list))))
(define (scale-127-100 n)
(/ (* n 100) 127))
(define (start-midi-control device-name)
(let ((midi-port (open-file device-name "r+0b")))
;; Read thread
(begin-thread
(let again ()
(let* ((status-byte (get-u8 midi-port))
(channel (bit-extract status-byte 0 4))
(command (bit-extract status-byte 4 8)))
(case command
;; Note on
((9) (let* ((note (get-u8 midi-port))
(vel (get-u8 midi-port)))
(display "Note = ")
(display (number->string note 16))
(display " velocity = ")
(display vel)
(newline)))
;; Control value
((11) (let* ((cc-number (get-u8 midi-port))
(value (get-u8 midi-port)))
(handle-cc-change channel
cc-number
(scale-127-100 value)))))
(yield)
(again))))
;; Write thread
(begin-thread
(let again ()
(let ((bytes-to-send (atomic-box-swap! send-queue '())))
(for-each (lambda (a)
(put-u8 midi-port a))
bytes-to-send)
(usleep 1000)
(again))))))
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