zakinit

zakinit
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Description

Establishes zak space. Must be called only once.

Syntax

zakinit isizea, isizek

Initialization

isizea -- the number of audio rate locations for a-rate patching. Each location is actually an array which is ksmps long.

isizek -- the number of locations to reserve for floats in the zk space. These can be written and read at i- and k-rates.

Performance

At least one location each is always allocated for both za and zk spaces. There can be thousands or tens of thousands za and zk ranges, but most pieces probably only need a few dozen for patching signals. These patching locations are referred to by number in the other zak opcodes.

To run zakinit only once, put it outside any instrument definition, in the orchestra file header, after sr, kr, ksmps, and nchnls.

	Note
	Zak channels count from 0, so if you define 1 channel, the only valid channel is channel 0.

Examples

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

Example 1066. Example of the zakinit 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
; Audio out   Audio in    No messages
-odac           -iadc     -d     ;;;RT audio I/O
; For Non-realtime ouput leave only the line below:
; -o zakinit.wav -W ;;; for file output any platform
</CsOptions>
<CsInstruments>

sr = 44100
ksmps = 4410
nchnls = 1

; Initialize the ZAK space.
; Create 3 a-rate variables and 5 k-rate variables.
zakinit 2, 3

instr 1 ;a simple waveform.
	; Generate a simple sine waveform.
	asin oscil 20000, 440, 1

	; Send the sine waveform to za variable #1.
	zaw asin, 1
endin

instr 2  ;generates audio output.
	; Read za variable #1.
	a1 zar 1

	; Generate audio output.
	out a1

	; Clear the za variables, get them ready for 
	; another pass.
	zacl 0, 3
endin

instr 3  ;increments k-type channels
	k0 zkr 0
	k1 zkr 1
	k2 zkr 2

	zkw k0+1, 0
	zkw k1+5, 1
	zkw k2+10, 2
endin

instr 4 ;displays values from k-type channels
	k0 zkr 0
	k1 zkr 1
	k2 zkr 2

; The total count for k0 is 30, since there are 10
; control blocks per second and intruments 3 and 4
; are on for 3 seconds.
	printf "k0 = %i\n",k0, k0
	printf "k1 = %i\n",k1, k1
	printf "k2 = %i\n",k2, k2
endin

</CsInstruments>
<CsScore>

; Table #1, a sine wave.
f 1 0 16384 10 1

i 1 0 1
i 2 0 1

i 3 0 3
i 4 0 3
e

</CsScore>
</CsoundSynthesizer>

Credits

Author: Robin Whittle

Australia

May 1997

New in version 3.45

Example written by Kevin Conder.