Csound

OPEN SOUND CONTROL - NETWORK COMMUNICATION

Open Sound Control (OSC) is a network protocol format for musical control data communication. A few of its advantages compared to MIDI are, that it's more accurate, quicker and much more flexible. With OSC you can easily send messages to other software independent if it's running on the same machine or over network. There is OSC support in software like PD, Max/Msp, Chuck or SuperCollider. A nice screencast of Andrés Cabrera shows communication between PD and Csound via OSC.1 

OSC messages contain an IP adress with port information and the data-package which will be send over network. In Csound, there are two opcodes, which provide access to network communication called OSCsend, OSClisten.

Example 08A01_osc.csd

<CsoundSynthesizer>
<CsOptions>
-o dac
</CsOptions>
<CsInstruments>
sr = 48000
ksmps = 32
nchnls = 2
0dbfs = 1

; localhost means communication on the same machine, otherwise you need
; an IP adress
#define IPADDRESS	# "localhost" #
#define S_PORT 		# 47120 #
#define R_PORT 		# 47120 #

turnon 1000  ; starts instrument 1000 immediately
turnon 1001  ; starts instrument 1001 immediately
	

instr 1000  ; this instrument sends OSC-values
	kValue1 randomh 0, 0.8, 4
	kNum randomh 0, 8, 8
	kMidiKey tab (int(kNum)), 2
	kOctave randomh 0, 7, 4
	kValue2 = cpsmidinn (kMidiKey*kOctave+33)
	kValue3 randomh 0.4, 1, 4
	Stext sprintf "%i", $S_PORT
	OSCsend   kValue1+kValue2, $IPADDRESS, $S_PORT, "/QuteCsound",
                  "fff", kValue1, kValue2, kValue3
endin


instr 1001  ; this instrument receives OSC-values	
	kValue1Received init 0.0
	kValue2Received init 0.0
	kValue3Received init 0.0
	Stext sprintf "%i", $R_PORT
	ihandle OSCinit $R_PORT
	kAction  OSClisten	ihandle, "/QuteCsound", "fff",
                 kValue1Received, kValue2Received, kValue3Received
		if (kAction == 1) then	
			printk2 kValue2Received
			printk2 kValue1Received
			
		endif
	aSine poscil3 kValue1Received, kValue2Received, 1
	; a bit reverbration
	aInVerb = aSine*kValue3Received
	aWetL, aWetR freeverb aInVerb, aInVerb, 0.4, 0.8
outs aWetL+aSine, aWetR+aSine
endin

</CsInstruments>
<CsScore>
f 1 0 1024 10 1
f 2 0 8 -2      0 2 4 7 9 11 0 2
e 3600
</CsScore>
</CsoundSynthesizer>
; example by Alex Hofmann (Mar. 2011)
  1. As another example you can communicate via OSC between Csound and Grame's Inscore. Find the code at https://github.com/joachimheintz/cs_inscore and video tutorials at
    http://vimeo.com/54160283 (installation)
    http://vimeo.com/54160405 (examples) ^