pvsinfo
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## pvsinfo

pvsinfo — Get information from a PVOC-EX formatted source.

## Description

Get format information about fsrc, whether created by an opcode such as pvsanal, or obtained from a PVOCEX file by pvsfread. This information is available at init time, and can be used to set parameters for other pvs opcodes, and in particular for creating function tables (e.g. for pvsftw), or setting the number of oscillators for pvsadsyn.

## Syntax

    ioverlap, inumbins, iwinsize, iformat pvsinfo fsrc

## Initialization

ioverlap -- The stream overlap size.

inumbins -- The number of analysis bins (amplitude+frequency) in fsrc. The underlying FFT size is calculated as (inumbins -1) * 2.

iwinsize -- The analysis window size. May be larger than the FFT size.

iformat -- The analysis frame format. If fsrc is created by an opcode, iformat will always be 0, signifying amplitude+frequency. If fsrc is defined from a PVOC-EX file, iformat may also have the value 1 or 2 (amplitude+phase, complex).

## Examples

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

Example 784. Example of the pvsinfo 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 out
    ;-iadc    ;;;uncomment -iadc if realtime audio input is needed too
    ; For Non-realtime ouput leave only the line below:
    ; -o pvsinfo.wav -W ;;; for file output any platform
    </CsOptions>
    <CsInstruments>

    sr = 44100
    ksmps = 32
    nchnls = 2
    0dbfs  = 1

    instr 1
    ; create a PVOC-EX (*.pvx) file with PVANAL first
    idur filelen  "fox.pvx"		;find duration of analysis file
    kpos line     0,p3,idur		;to ensure we process whole file
    fsrc pvsfread kpos, "fox.pvx"	;create fsig from (mono) file

    iovl,inb,iws,ifmt pvsinfo fsrc	;get info
    print iovl,inb,iws,ifmt		;print info

    aout pvsynth fsrc
         outs aout, aout

    endin
    </CsInstruments>
    <CsScore>

    i 1 0 3
    e
    </CsScore>
    </CsoundSynthesizer>

The example will produce the following output:

    instr 1:  iovl = 256.000  inb = 513.000  iws = 2048.000  ifmt = 0.000

## Credits

Author: Richard Dobson
August 2001

New in version 4.13

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