OSClisten — Listen for OSC messages to a particular path.
Plugin opcode in osc.
On each k-cycle looks to see if an OSC message has been sent to a given path of a given type.
kans OSClisten ihandle, idest, itype [, xdata1, xdata2, ...]
kans, kdata[] OSClisten ihandle, idest, itype
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 path prefixed with a forward slash, with optional subdirectories separated by forward slashes. Csound processes incoming messages that match this address.
itype -- a string that indicates the types of the optional arguments that are to be read. The string can contain the characters "acdfhisAG" which stand for audio, character, double, float, 64-bit integer, 32-bit integer, string, scalar array and f-table. All types other than 'asA' require a k-rate variable; 's' requires a string variable, 'a' an audio variable and 'A' an i- or k- rate array. For type 'G', a variable or constant can be used.
A handler is inserted into the listener (see OSCinit) to intercept messages that match this pattern.
kans -- set to 1 if a new message was received, or 0 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 a, ga, k, gk, S, gS, k[] and gk[] and may need to be declared with init, or = in the case of string variables, before calling OSClisten.
Alternatively, if the message to be received is a series of values all of the same scalar numeric type (e.g., one of "dfhi"), then the return parameter kdata may be used in place of xdata variables. kdata must be an array, it must be declared with init before calling OSClisten, or used with the [] syntax. It will be created to sufficient size if it is other that a one dimensional array of size greater or equal to length as the format string. If a message is received, this array will be filled with the incoming values. See below for an example of this usage.
This 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
This example shows use of the alternate form of the opcode, where an array is used to receive a list of scalar values. In this case, the OSC sender is simulating a set of radio buttons (as is done, for example by a Lemur "Switches" object set in this mode), where the button that is set will have value 1.0 and all other buttons will have value 0.0.
gihandle OSCinit 7770
instr 1
; the UI object behind the OSC sender has 5 buttons arranged as radio buttons
kdata[] init 5
nxtmsg:
kk, kdata OSClisten gihandle, "/foo/bar", "fffff"
if (kk == 0) goto ex
; the only button with a non-zero value will be the one that is set,
; so maxarray is used to get the index of that element
kmax, kidx maxarray kdata
printks "button %d (zero-based) is set\n", 0, kidx
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 693. 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> ; network_recv.csd <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>
More information on this opcode: http://www.youtube.com/watch?v=JX1C3TqP_9Y , made by Andrés Cabrera