filepeak
Prev  Orchestra Opcodes and Operators  Next

filepeak

filepeak — Returns the peak absolute value of a sound file.

Description

Returns the peak absolute value of a sound file.

Syntax

ir filepeak ifilcod [, ichnl]

Initialization

ifilcod -- sound file to be queried

ichnl (optional, default=0) -- channel to be used in calculating the peak value. Default is 0.

  • ichnl = 0 returns peak value of all channels

  • ichnl > 0 returns peak value of ichnl

Performance

filepeak returns the peak absolute value of the sound file ifilcod.

Examples

Here is an example of the filepeak opcode. It uses the file filepeak.csd, and mary.wav.

Example 138. Example of the filepeak 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
-odac           -iadc    ;;;RT audio I/O
; For Non-realtime ouput leave only the line below:
; -o filepeak.wav -W ;;; for file output any platform
</CsOptions>
<CsInstruments>

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

; Instrument #1.
instr 1
  ; Print out the peak absolute value of the
  ; audio file "mary.wav".
  ipeak filepeak "mary.wav"
  print ipeak
endin


</CsInstruments>
<CsScore>

; Play Instrument #1 for 1 second.
i 1 0 1
e


</CsScore>
</CsoundSynthesizer>


The peak absolute value of the audio file “mary.wav” is 0.306902. So filepeak's output should include a line like this: 

instr 1:  ipeak = 0.307

See Also

filelen, filenchnls, filesr

Credits

Author: Matt Ingalls
July 1999

Example written by Kevin Conder.

New in Csound version 3.57

Prev  Up  Next
filenchnls  Home  filesr