pvsinfo — Get information from a PVOC-EX formatted source.
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.
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).
Here is an example of the pvsinfo opcode. It uses the file pvsinfo.csd.
Example 846. 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 ; by Menno Knevel 2021 ; analyze sound file and output result to pvoc-ex file ires system_i 1,{{ pvanal fox.wav fox.pvx }} ; default settings ires1 system_i 1,{{ pvanal -n256 MSjungleMid.wav MSjungleMid.pvx }} ; different frame size instr 1 if p4 == 0 then 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 prints "\n---***you now hear the analyzed file fox.pvx***---" else idur filelen "MSjungleMid.pvx" ;find duration of analysis file kpos line 0,p3,idur ;to ensure we process whole file fsrc pvsfread kpos, "MSjungleMid.pvx" ;create fsig from (mono) file prints "\n---***you now hear the analyzed file MSjungleMid.pvx***---" endif iovl,inb,iws,ifmt pvsinfo fsrc ;get info prints "\n Overlap size = %d\n", iovl ;print info prints " Number of bins = %d\n",inb prints " Window size = %d\n",iws prints " Frame Format = %d\n",ifmt prints "\n" aout pvsynth fsrc outs aout, aout endin </CsInstruments> <CsScore> i 1 0 3 0 ; the fox i 1 5 13 1 ; the jungle e </CsScore> </CsoundSynthesizer>
The example will produce the following output:
instr 1: iovl = 256.000 inb = 513.000 iws = 2048.000 ifmt = 0.000