vaget

Access values of the current buffer of an a-rate variable by indexing.

Useful for doing sample-by-sample manipulation at k-rate without using setksmps 1.

Note

Because this opcode does not do any bounds checking, the user must be careful not to try to read values past ksmps (the size of a buffer for an a-rate variable) by using index values greater than ksmps.

Note

In Csound6 this opcode does do bounds checking.

Syntax

kval vaget kndx, avar

Performance

kval - value read from avar

kndx - index of the sample to read from the current buffer of the given avar variable

avar - a-rate variable to read from

Examples

Here is an example of the vaget opcode. It uses the file vaget.csd.

<CsoundSynthesizer>
<CsOptions>
; Select audio/midi flags here according to platform
; Audio out   Audio in    No messages
-odac           -iadc     -d     ;;;RT audio I/O
; For Non-realtime ouput leave only the line below:
; -o avarget.wav -W ;;; for file output any platform
</CsOptions>
<CsInstruments>
sr=44100
ksmps=16
nchnls=2

        instr 1 ; Sqrt Signal
ifreq = (p4 > 15 ? p4 : cpspch(p4))
iamp = ampdb(p5)

aout init 0
ksampnum init 0

kenv    linseg 0, p3 * .5, 1, p3 * .5, 0

aout1   vco2    1, ifreq
aout2   vco2    .5, ifreq * 2
aout3   vco2    .2, ifreq * 4

aout    sum     aout1, aout2, aout3

;Take Sqrt of signal, checking for negatives
kcount = 0

loopStart:

        kval vaget kcount,aout

        if (kval > .0) then
                kval = sqrt(kval)
        elseif (kval < 0) then
                kval = sqrt(-kval) * -1
        else
                kval = 0
        endif

        vaset kval, kcount,aout

loop_lt kcount, 1, ksmps, loopStart

aout = aout * kenv

aout    moogladder aout, 8000, .1

aout = aout * iamp

outs aout, aout
        endin

</CsInstruments>

<CsScore>

i1      0.0     2 440 80
e

</CsScore>

</CsoundSynthesizer>

See also

Sample Level Operators

Credits

Author: Steven Yi

New in version 5.04

September 2006.