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 files filepeak.orc, filepeak.sco, and mary.wav.
Example 126. Example of the filepeak opcode.
/* filepeak.orc */ ; 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 /* filepeak.orc */
/* filepeak.sco */ ; Play Instrument #1 for 1 second. i 1 0 1 e /* filepeak.sco */
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