filelen — Returns the length of a sound file.
filelen returns the length of the sound file ifilcod in seconds. filelen can return the length of convolve and PVOC files if the "allow raw sound file" flag is not zero (it is non-zero by default).
Here is an example of the filelen opcode. It uses the file filelen.csd, and mary.wav.
Example 136. Example of the filelen 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 filelen.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 length of the audio file ; "mary.wav" in seconds. ilen filelen "mary.wav" print ilen endin </CsInstruments> <CsScore> ; Play Instrument #1 for 1 second. i 1 0 1 e </CsScore> </CsoundSynthesizer>
The audio file “mary.wav” is 3.5 seconds long. So filelen's output should include a line like this:
instr 1: ilen = 3.501