filepeak — Returns the peak absolute value of a sound file.
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
filepeak returns the peak absolute value of the sound file ifilcod. Currently, filepeak supports only AIFF-C float files.
Here is an example of the filepeak opcode. It uses the file filepeak.csd, and mary.wav.
Example 129. 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