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packetiser.lisp
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(in-package :cl-rtmidi)
(defparameter *midi-decoder-state* :waiting)
(defparameter +max-packet-length+ 3)
(defclass midi-message ()
((raw-midi :initarg :raw-midi)
(timestamp :initarg :timestamp
:initform (get-internal-utime))))
(defclass midi-performance-gesture
(midi-message)
())
(defclass note-on-midi-message (midi-performance-gesture)
())
(defclass note-off-midi-message (midi-performance-gesture)
())
(defclass key-pressure-midi-message (midi-performance-gesture)
())
(defclass control-change-midi-message (midi-performance-gesture)
())
(defclass channel-mode-midi-message (midi-performance-gesture)
())
(defclass program-change-midi-message (midi-performance-gesture)
())
(defclass channel-pressure-midi-message (midi-performance-gesture)
())
(defclass pitch-bend-midi-message (midi-performance-gesture)
())
(defclass sysex-message (midi-message)
())
(defclass sysex-dump (sysex-message)
())
(defclass boomerang-sysex-message (sysex-message)
())
(defclass midi-timing-message (sysex-message)
())
(defclass clock-tick-midi-message (midi-timing-message)
())
(defclass start-midi-message (midi-timing-message)
())
(defclass continue-midi-message (midi-timing-message)
())
(defclass stop-midi-message (midi-timing-message)
())
(defclass song-position-pointer-midi-message (midi-timing-message)
())
(defun hi-nibble (byte)
(ash byte -4))
(defun lo-nibble (byte)
(logand byte #b1111))
(defun hi-bit (byte)
(ash byte -7))
(defun pack-nibbles (hi-nibble lo-nibble)
(+ (ash hi-nibble 4)
lo-nibble))
(defun parse-packet (packet)
(match (list (hi-bit (car packet))
(hi-nibble (car packet))
(lo-nibble (car packet))
(cdr packet))
((list _
#b1111
#b1000
_)
(make-instance 'clock-tick-midi-message
:raw-midi packet))
((list _
#b1111
#b1010
_)
(make-instance 'start-midi-message
:raw-midi packet))
((list _
#b1111
#b1011
_)
(make-instance 'continue-midi-message
:raw-midi packet))
((list _
#b1111
#b1100
_)
(make-instance 'stop-midi-message
:raw-midi packet))
((list 1 hi lo (guard rest
(every (lambda (x)
(= 0 (hi-bit x)))
rest)))
(match (list hi lo rest)
((list #b1000 _ (guard rest (= 2 (length rest))))
(make-instance 'note-off-midi-message
:raw-midi packet))
((list #b1001 _ (guard rest (= 2 (length rest))))
(make-instance 'note-on-midi-message
:raw-midi packet))
((list #b1010 _ (guard rest (= 2 (length rest))))
(make-instance 'key-pressure-midi-message
:raw-midi packet))
((list #b1011 _ (guard rest (= 2 (length rest))))
(make-instance 'control-change-midi-message
:raw-midi packet))
((list #b1100 _ (guard rest (= 1 (length rest))))
(make-instance 'program-change-midi-message
:raw-midi packet))
((list #b1101 _ (guard rest (= 1 (length rest))))
(make-instance 'channel-pressure-midi-message
:raw-midi packet))
((list #b1011 _ (guard rest (= 2 (length rest))))
(make-instance 'pitch-bend-midi-message
:raw-midi packet))))))
(defun read-midi-message (&optional (midi-stream *default-midi-in-stream*))
(declare (optimize (debug 3)))
"reads midi-stream until a well-formed midi-message is received"
(let ((packet (list (last-header midi-stream))))
(loop as next-byte = (read-midi-byte midi-stream)
do
(if (= 1 (hi-bit next-byte))
(progn (setf packet (list next-byte))
(setf (last-header midi-stream) next-byte))
(push next-byte packet))
(when packet
(let ((message (parse-packet (reverse packet))))
(when message
(return-from read-midi-message
message)))))))
(defvar *default-midi-out-stream*)
(defun write-midi-message (message &optional (midi-stream *default-midi-out-stream*))
(loop for byte in (slot-value message 'raw-midi)
do (write-midi-byte byte midi-stream))
(midi-force-output midi-stream))
#+nil
(with-open-file (stream "/dev/snd/midiC3D0"
:direction :io
:if-exists :overwrite
:element-type '(unsigned-byte 8))
(loop (read-midi-message stream)))
(defun midi-note= (x y)
(and (= (car (slot-value x 'raw-midi))
(car (slot-value y 'raw-midi)))
(= (cadr (slot-value x 'raw-midi))
(cadr (slot-value y 'raw-midi)))))
(defun make-midi-note-off (chan key &optional (velocity 0))
(make-instance 'note-off-midi-message
:raw-midi (list (pack-nibbles #b1000 chan)
key velocity)))
(defun make-midi-note-on (chan key &optional (velocity 127))
(make-instance 'note-on-midi-message
:raw-midi (list (pack-nibbles #b1001 chan)
key velocity)))