prealloc
Prev | Orchestra Opcodes and Operators | Next

## prealloc

prealloc — Creates space for instruments but does not run them.

## Description

Creates space for instruments but does not run them.

## Syntax

    prealloc insnum, icount

    prealloc "insname", icount

## Initialization

insnum -- instrument number

icount -- number of instrument allocations

“insname” -- A string (in double-quotes) representing a named instrument.

## Performance

All instances of prealloc must be defined in the header section, not in the instrument body.

## Examples

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

Example 729. Example of the prealloc 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 prealloc.wav -W ;;; for file output any platform
    </CsOptions>
    <CsInstruments>

    ; Initialize the global variables.
    sr = 44100
    kr = 4410
    ksmps = 10
    nchnls = 1

    ; Pre-allocate memory for five instances of Instrument #1.
    prealloc 1, 5

    ; Instrument #1
    instr 1
      ; Generate a waveform, get the cycles per second from the 4th p-field.
      a1 oscil 6500, p4, 1
      out a1
    endin

    </CsInstruments>
    <CsScore>

    ; Just generate a nice, ordinary sine wave.
    f 1 0 32768 10 1

    ; Play five instances of Instrument #1 for one second.
    ; Note that 4th p-field contains cycles per second.
    i 1 0 1 220
    i 1 0 1 440
    i 1 0 1 880
    i 1 0 1 1320
    i 1 0 1 1760
    e

    </CsScore>
    </CsoundSynthesizer>

## See Also

cpuprc, maxalloc

## Credits

Author: Gabriel Maldonado
Italy
July 1999

Example written by Kevin Conder.

New in Csound version 3.57

Prev | Up | Next
powoftwo | Home | prepiano