OSClisten — Listen for OSC messages to a particular path.
On each k-cycle looks to see if an OSC message has been send to a given path of a given type.
ihandle -- a handle returned by an earlier call to OSCinit, to associate OSClisten with a particular port number.
idest -- a string that is the destination address. This takes the form of a file name with directories. Csound uses this address to decide if messages are meant for csound.
itype -- a string that indicates the types of the optional arguments that are to be read. The string can contain the characters "cdfhis" which stand for character, double, float, 64-bit integer, 32-bit integer, and string. All types other than 's' require a k-rate variable, while 's' requires a string variable.
A handler is inserted into the listener (see OSCinit) to intercept messages of this pattern.
kans -- set to 1 if a new message was received, or zero if not. If multiple messages are received in a single control period, the messages are buffered, and OSClisten can be called again until zero is returned.
If there was a message the xdata variables are set to the incoming values, as interpretted by the itype parameter. Note that although the xdata variables are on the right of an operation they are actually outputs, and so must be variables of type k, gk, S, or gS, and may need to be declared with init, or = in the case of string variables, before calling OSClisten.
The example shows a pair of floating point numbers being received on port 7770.
sr = 44100 ksmps = 100 nchnls = 2 gihandle OSCinit 7770 instr 1 kf1 init 0 kf2 init 0 nxtmsg: kk OSClisten gihandle, "/foo/bar", "ff", kf1, kf2 if (kk == 0) goto ex printk 0,kf1 printk 0,kf2 kgoto nxtmsg ex: endin
Below are two .csd files which demonstrate the usage of the OSC opcodes. They use the files OSCmidisend.csd and OSCmidircv.csd.
Example 289. Example of the OSC opcodes.
The following two .csd files demonstrate the usage of the OSC opcodes in csound. The first file, OSCmidisend.csd, transforms received real-time MIDI messages into OSC data. The second file, OSCmidircv.csd, can take these OSC messages, and intrepret them to generate sound from note messages, and store controller values. It will use controller number 7 to control volume. Note that these files are designed to be on the same machine, but if a different host address (in the IPADDRESS macro) is used, they can be separate machines on a network, or connected through the internet.
CSD file to send OSC messages:
<CsoundSynthesizer> <CsOptions> ; Select audio/midi flags here according to platform ; Audio out Audio in -odac -iadc ;;;RT audio I/O </CsOptions> <CsInstruments> sr = 44100 ksmps = 128 nchnls = 1 ; Example by David Akbari 2007 ; Modified by Jonathan Murphy ; Use this file to generate OSC events for OSCmidircv.csd #define IPADDRESS # "localhost" # #define PORT # 47120 # turnon 1000 instr 1000 kst, kch, kd1, kd2 midiin OSCsend kst+kch+kd1+kd2, $IPADDRESS, $PORT, "/midi", "iiii", kst, kch, kd1, kd2 endin </CsInstruments> <CsScore> f 0 3600 ;Dummy f-table e </CsScore> </CsoundSynthesizer>
CSD file to receive OSC messages:
<CsoundSynthesizer> <CsOptions> ; Select audio/midi flags here according to platform ; Audio out Audio in -odac -iadc ;;;RT audio I/O </CsOptions> <CsInstruments> sr = 44100 ksmps = 128 nchnls = 1 ; Example by Jonathan Murphy and Andres Cabrera 2007 ; Use file OSCmidisend.csd to generate OSC events for this file 0dbfs = 1 gilisten OSCinit 47120 gisin ftgen 1, 0, 16384, 10, 1 givel ftgen 2, 0, 128, -2, 0 gicc ftgen 3, 0, 128, -7, 100, 128, 100 ;Default all controllers to 100 ;Define scale tuning giji_12 ftgen 202, 0, 32, -2, 12, 2, 256, 60, 1, 16/15, 9/8, 6/5, 5/4, 4/3, 7/5, \ 3/2, 8/5, 5/3, 9/5, 15/8, 2 #define DEST #"/midi"# ; Use controller number 7 for volume #define VOL #7# turnon 1000 instr 1000 kst init 0 kch init 0 kd1 init 0 kd2 init 0 next: kk OSClisten gilisten, $DEST, "iiii", kst, kch, kd1, kd2 if (kk == 0) goto done printks "kst = %i, kch = %i, kd1 = %i, kd2 = %i\\n", \ 0, kst, kch, kd1, kd2 if (kst == 176) then ;Store controller information in a table tablew kd2, kd1, gicc endif if (kst == 144) then ;Process noteon and noteoff messages. kkey = kd1 kvel = kd2 kcps cpstun kvel, kkey, giji_12 kamp = kvel/127 if (kvel == 0) then turnoff2 1001, 4, 1 elseif (kvel > 0) then event "i", 1001, 0, -1, kcps, kamp endif endif kgoto next ;Process all events in queue done: endin instr 1001 ;Simple instrument icps init p4 kvol table $VOL, gicc ;Read MIDI volume from controller table kvol = kvol/127 aenv linsegr 0, .003, p5, 0.03, p5 * 0.5, 0.3, 0 aosc oscil aenv, icps, gisin out aosc * kvol endin </CsInstruments> <CsScore> f 0 3600 ;Dummy f-table e </CsScore> </CsoundSynthesizer>