pcount
pcount — Returns the number of pfields belonging to a note event.
Initialization
icount - stores the number of pfields for the current note event.
![[Note]](images/note.png)
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Note that the reported number of pfields is not necessarily what is explicitly written in the score, but the pfields available to the instrument through mechanisms like pfield carry |
Examples
Here is an example of the pcount opcode. Play pcount.csd
Example 746. Example of the pcount opcode.
See the sections Real-time Audio and Command Line Flags for more information on using command line flags.
<CsoundSynthesizer> <CsOptions> ; Select audio/midi flags here according to platform -odac ;;;realtime audio ;-iadc ;;;uncomment -iadc if realtime audio input is needed too ; For Non-realtime ouput leave only the line below: ; -o pcount.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> sr = 44100 ksmps = 32 nchnls = 2 0dbfs = 1 ; This UDO returns a pfield value but returns 0 if it does not exist. opcode mypvalue, i, i index xin inum pcount if (index > inum) then iout = 0.0 else iout pindex index endif xout iout endop ; Envelope UDO that reads parameters from a flexible number of pfields ; Syntax: kenv flexlinseg ipstart ; ipstart is the first pfield of the envelope ; parameters. Reads remaining pfields (up to 21 of them). ; kenv is the output envelope. opcode flexlinseg, k, i ipstart xin iep1 mypvalue ipstart iep2 mypvalue ipstart + 1 iep3 mypvalue ipstart + 2 iep4 mypvalue ipstart + 3 iep5 mypvalue ipstart + 4 iep6 mypvalue ipstart + 5 iep7 mypvalue ipstart + 6 iep8 mypvalue ipstart + 7 iep9 mypvalue ipstart + 8 iepa mypvalue ipstart + 9 iepb mypvalue ipstart + 10 iepc mypvalue ipstart + 11 iepd mypvalue ipstart + 12 iepe mypvalue ipstart + 13 iepf mypvalue ipstart + 14 iepg mypvalue ipstart + 15 ieph mypvalue ipstart + 16 iepi mypvalue ipstart + 17 iepj mypvalue ipstart + 18 iepk mypvalue ipstart + 19 iepl mypvalue ipstart + 20 kenv linseg iep1, iep2, iep3, iep4, iep5, iep6, iep7, iep8, \ iep9, iepa, iepb, iepc, iepd, iepe, iepf, iepg, \ ieph, iepi, iepj, iepk, iepl xout kenv endop instr 1 ; This instrument only requires 3 pfields but can accept up to 24. ; (You will still get warnings about more than 3). kenv flexlinseg 4 ; envelope params start at p4 aout oscili kenv*.5, 256, 1 outs aout, aout endin </CsInstruments> <CsScore> f1 0 8192 10 1 i1 0 2 0.0 1.0 1.0 1.0 0.0 i1 2 2 0.0 0.1 1.0 1.0 1.0 0.1 0.0 i1 4 2 0.0 0.5 0.0 ; one problem is that "missing" pfields carry i1 6 2 0.0 0.5 0.0 ! ; now we can fix this problem with ! i1 8 10 0.0 3.0 1.0 0.3 0.1 0.3 1.0 0.3 0.1 0.3 1.0 0.3 0.1 0.8 0.9 5.0 0.0 e </CsScore> </CsoundSynthesizer>
The example will produce the following output:
WARNING: instr 1 uses 3 p-fields but is given 8
B 0.000 .. 2.000 T 2.000 TT 2.000 M: 0.49966 0.49966
WARNING: instr 1 uses 3 p-fields but is given 10
B 2.000 .. 4.000 T 4.000 TT 4.000 M: 0.50000 0.50000
WARNING: instr 1 uses 3 p-fields but is given 10
B 4.000 .. 6.000 T 6.000 TT 6.000 M: 0.49943 0.49943
WARNING: instr 1 uses 3 p-fields but is given 6
B 6.000 .. 8.000 T 8.000 TT 8.000 M: 0.00000 0.00000
WARNING: instr 1 uses 3 p-fields but is given 20
B 8.000 .. 18.000 T 18.000 TT 18.000 M: 0.49994 0.49994
The warnings occur because pfields are not used explicitly by the instrument.