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Preamble to the Gnu Lesser General Public License
Copyright (c) 2000 Franz Incorporated, Berkeley, CA 94704
The concept of the GNU Lesser General Public License version 2.1 ("LGPL") has been adopted to govern the use and distribution of above-mentioned application. However, the LGPL uses terminology that is more appropriate for a program written in C than one written in Lisp. Nevertheless, the LGPL can still be applied to a Lisp program if certain clarifications are made. This document details those clarifications. Accordingly, the license for the open-source Lisp applications consists of this document plus the LGPL. Wherever there is a conflict between this document and the LGPL, this document takes precedence over the LGPL.
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what ->
This is a common-lisp implementation of the Open Sound Control Protocol, aka OSC. It should be close to ansi standard, and does not rely on any external code/ffi/etc+ to do the basic encoding and decoding of packets. since OSC does not specify a transport layer, messages can be send using TCP or UDP, however it seems UDP is more common amongst the programms that communicate using the protocol.
else ->
- specific info about what is/isnt working can be found in the header of osc.lisp
- more details about OSC can be found at http://www.cnmat.berkeley.edu/OpenSoundControl/
- current versions of this code can be found at http://fo.am/darcs/osc

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;; -*- mode: lisp -*-
;;
;; Examples of how to send OSC messages. ..
;;
;; Copyright (C) 2004 FoAM vzw
;;
;; Authors
;; - nik gaffney <nik@f0.am>
;;
;;;;; ;; ; ; ;; ; ;
;;;;;::::: : : : ; ;; ; ; ; ; ; ;
;;
;; Commentry
;;
;; These examples are currently sbcl specific (ports welcome!)
;; but should still be able to explain enough to get started. ..
;;
;; eg. listen on port 6667 for incoming msgs
;;
;; (osc-listen 6667)
;;
;; eg. listen on port 6667 and send to 10.0.89:6668
;; note the ip# is formatted as a vector
;;
;; (osc-reflector 6667 #(10 0 0 89) 6668)
;;
;;;;;:::;;: ; ; ;::: ; ;; ;; ; ;; ;
(require :sb-bsd-sockets)
;(require :osc)
(defun osc-listen (port)
"a basic test function which attempts to decode osc stuff a
given port. default ogreOSC port is 4178"
(let ((s (make-instance
'inet-socket :type :datagram :protocol :udp))
(buffer (make-sequence '(vector (unsigned-byte 8)) 1024)))
(socket-bind s #(127 0 0 1) port)
(format t "listening on localhost port ~A~%~%" port)
(unwind-protect
(loop do
(socket-receive s buffer nil :waitall t)
(format t "receiveded -=> ~S~%" (osc-decode-message buffer)))
(when s (socket-close s)))))
(defun osc-reflector (listen-port send-ip send-port)
"reflector.. . listens on a given port and sends out on another
note ip#s need to be in the format #(127 0 0 1) for now.. ."
(let ((in (make-instance
'inet-socket :type :datagram :protocol :udp))
(out (make-instance
'inet-socket :type :datagram :protocol :udp))
(buffer (make-sequence '(vector (unsigned-byte 8)) 512)))
(socket-bind in #(127 0 0 1) listen-port)
(socket-connect out send-ip send-port)
(let ((stream
(socket-make-stream
out :input t :output t
:element-type '(unsigned-byte 8) :buffering :full)))
(unwind-protect
(loop do
(socket-receive in buffer nil :waitall t)
(let ((oscuff (osc-decode-message buffer)))
(format t "glonked -=> message with ~S~% arg(s)" (length oscuff))
(write-sequence (stream-t1 oscuff) stream)))
(when in (socket-close in))
(when out (socket-close sc))))))
(defun stream-t1 (osc-message stream)
"writes a given message to a stream. keep in mind that when using a buffered stream
any funtion writing to the stream should call (finish-output stream) after it sends
the mesages,. ."
(write-sequence (osc-encode-message osc-message) stream)
(finish-output stream))
;end

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;; -*- mode: lisp -*-
;;
;; an implementation of the OSC (Open Sound Control) protocol
;;
;; copyright (C) 2004 FoAM vzw.
;;
;; This software is licensed under the terms of the Lisp Lesser GNU Public
;; License , known as the LLGPL. The LLGPL consists of a preamble and
;; the LGPL. Where these conflict, the preamble takes precedence. The
;; LLGPL is available online at http://opensource.franz.com/preamble.html.
;;
;; authors
;;
;; nik gaffney <nik@f0.am>
;;
;; requirements
;;
;; dependent on sbcl for sb-bsd-sockets and float encoding
;;
;; commentary
;;
;; this is a partial implementation of the OSC protocol which is used
;; for communicatin mostly amognst music programs and their attatched
;; musicians. eg. sc3, max/pd, reaktor/traktorska etc+. more details
;; of the procol can be found at the open sound control pages -=>
;; http://www.cnmat.berkeley.edu/OpenSoundControl/
;;
;; - currently doesnt send timetags, but does send typetags
;; - will most likely crash if the input is malformed
;; - int32 en/de-coding based on code (c) Walter C. Pelissero
;; to do
;;
;; - liblo like network wrapping
;; - error handling
;; - receiver
;; - osc-tree as name.value alist for responder/serve-event
;; - portable en/decoding of floats -=> ieee754 tests
;; - (in-package 'osc)
;; - bundles
;; - blobs
;; Known BUGS
;;
;; - multiple arg messages containing strings can corrupt further output. .
;; probably need to collect a few more testcases. .
;; changes
;;
;; Sat, 18 Dec 2004 15:41:26 +0100
;; - initial version
;; Mon, 24 Jan 2005 15:43:20 +0100
;; - sends and receives multiple arguments
;; - tests in osc-test.lisp
;;
;;;;;; ; ;; ; ; ; ; ; ; ;
;;
;; eNcoding OSC messages
;;
;;; ;; ;; ; ; ;; ; ; ; ;
(defun osc-encode-message (address &rest data)
"encodes an osc message with the given address and data."
(concatenate '(vector '(unsigned-byte 8))
(osc-encode-address address)
(osc-encode-typetags data)
(osc-encode-data data)))
(defun osc-encode-address (address)
(cat (map 'vector #'char-code address)
(osc-string-padding address)))
(defun osc-encode-typetags (data)
"creates a typetag string suitable for teh given data.
valid typetags according to the osc spec are ,i ,f ,s and ,b
non-std extensions include ,{h|t|d|S|c|r|m|T|F|N|I|[|]}
see the spec for more details. ..
NOTE: currently handles the following tags only
i => #(105) => int32
f => #(102) => float
s => #(115) => string"
(let ((lump (make-array 0 :adjustable t :fill-pointer t)))
(vector-push-extend (char-code #\,) lump) ; typetag begins with ","
(dolist (x data)
(typecase x
(integer
(vector-push-extend (char-code #\i) lump))
(float
(vector-push-extend (char-code #\f) lump))
(simple-string
(vector-push-extend (char-code #\s) lump))
(t
(error "unrecognised datatype"))))
(cat lump
(osc-pad (osc-padding-length (length lump))))))
(defun osc-encode-data (data)
"encodes data in a format suitable for an OSC message"
(let ((lump (make-array 0 :adjustable t :fill-pointer t)))
(dolist (x data)
(typecase x
(integer
(setf lump (cat lump (encode-int32 x))))
(float
(setf lump (cat lump (encode-float32 x))))
(simple-string
(setf lump (cat lump (encode-string x))))
(t
(error "wrong type"))))
lump))
(defun encode-string (string)
(cat (map 'vector #'char-code string)
(osc-string-padding string)))
;;;;;; ; ;; ; ; ; ; ; ; ;
;;
;; decoding OSC messages
;;
;;; ;; ;; ; ; ; ; ; ;
(defun osc-decode-message (message)
"reduces an osc message to an (address . data) pair. .."
(let ((x (position (char-code #\,) message)))
(cons (osc-decode-address (subseq message 0 x))
(osc-decode-taged-data (subseq message x)))))
(defun osc-decode-address (address)
(coerce (map 'vector #'code-char address) 'string))
(defun osc-decode-taged-data (data)
"decodes data encoded with typetags...
NOTE: currently handles the following tags only
i => #(105) => int32
f => #(102) => float
s => #(115) => string"
(setf div (position 0 data))
(let ((tags (subseq data 1 div))
(chunks (subseq data (osc-string-length (subseq data 0 div))))
(acc '())
(result '()))
(setf acc chunks)
(map 'vector
#'(lambda (x)
(cond
((eq x (char-code #\i))
(push (decode-int32 (subseq acc 0 4))
result)
(setf acc (subseq acc 4)))
((eq x (char-code #\f))
(push (decode-float32 (subseq acc 0 4))
result)
(setf acc (subseq acc 4)))
((eq x (char-code #\s))
(push (decode-string
(subseq acc 0
(+ (osc-padding-length (position 0 acc))
(position 0 acc))))
result)
(setf acc (subseq acc (position 0 acc))))
((eq x (char-code #\b)) (decode-blob x))
(t (error "unrecognised typetag"))))
tags)
(nreverse result)))
(defun osc-split-data (data)
"splits incoming data into the relevant unpadded chunks, ready for conversion .. ."
(loop for i = 0 then (1+ j)
as j = (position #\0 string :start i)
collect (subseq string i j)
while j))
;; dataformat en- de- cetera.
(defun encode-float32 (f)
"encode an ieee754 float as a 4 byte vector. currently sbcl specifc"
#+sbcl (encode-int32 (sb-kernel:single-float-bits f)))
(defun decode-float32 (s)
"ieee754 float from a vector of 4 bytes in network byte order"
#+sbcl (sb-kernel:make-single-float (decode-int32 s)))
(defun decode-int32 (s)
"4 byte > 32 bit int > two's compliment (in network byte order)"
(let ((i (+ (ash (elt s 0) 24)
(ash (elt s 1) 16)
(ash (elt s 2) 8)
(elt s 3))))
(if (>= i #x7fffffff)
(- 0 (- #x100000000 i))
i)))
(defun encode-int32 (i)
"convert integer into a sequence of 4 bytes in network byte order."
(declare (type integer s))
(let ((buf (make-sequence '(vector (unsigned-byte 8)) 4)))
(macrolet ((set-byte (n)
`(setf (elt buf ,n)
(logand #xff (ash i ,(* 8 (- n 3)))))))
(set-byte 0)
(set-byte 1)
(set-byte 2)
(set-byte 3))
buf))
(defun decode-string (data)
"converts a binary vector to a string and removes trailing #\nul characters"
(string-trim '(#\nul) (coerce (map 'vector #'code-char data) 'string)))
(defun encode-string (string)
"encodes a string as a vector of character-codes, padded to 4 byte boundary"
(cat (map 'vector #'char-code string)
(osc-string-padding string)))
(defun decode-blob (b)
(error "cant decode blobs for now. .."))
(defun encode-blob (b)
(error "cant encode blobs for now. .."))
;; utility functions for OSC slonking
(defmacro cat (s &rest body)
`(concatenate '(vector *) ,s ,@body))
(defun osc-string-length (string)
"determines the length required for a padded osc string"
(let ((n (length string)))
(+ n (osc-padding-length n))))
(defun osc-padding-length (s)
"returns the padding required for a given length of string"
(- 4 (mod s 4)))
(defun osc-string-padding (string)
"returns the padding required for a given osc string"
(osc-pad (- 4 (mod (length string) 4))))
(defun osc-pad (n)
"make a sequence of the required number of #\Nul characters"
(make-array n :initial-element 0 :fill-pointer n))
;; end