Returns the number of channels of a GEN01 table, determined from the header of the original file. If the original file has no header or the table was not created by these GEN01, ftchnls returns -1.
Here is an example of the ftchnls opcode. It uses the files ftchnls.orc, ftchnls.sco, and mary.wav.
Example 1. Example of the ftchnls opcode.
/* ftchnls.orc */
; Initialize the global variables.
sr = 44100
kr = 4410
ksmps = 10
nchnls = 1
; Instrument #1.
instr 1
; Print out the number of channels in Table #1.
ichnls = ftchnls(1)
print ichnls
endin
/* ftchnls.orc */
/* ftchnls.sco */
; Table #1: Use an audio file, Csound will determine its size.
f 1 0 0 1 "mary.wav" 0 0 0
; Play Instrument #1 for 1 second.
i 1 0 1
e
/* ftchnls.sco */
instr 1: ichnls = 1.000