ftchnls
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## ftchnls

ftchnls — Returns the number of channels in a stored function table.

## Description

Returns the number of channels in a stored function table.

## Syntax

    ftchnls(x) (init-rate args only)

## Performance

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.

## Examples

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

Example 272. Example of the ftchnls 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 ftchnls.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 number of channels in Table #1.
      ichnls = ftchnls(1)
      print ichnls
    endin

    </CsInstruments>
    <CsScore>

    ; 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

    </CsScore>
    </CsoundSynthesizer>

Since the audio file “mary.wav” is monophonic (1 channel), its output should include a line like this:

    instr 1:  ichnls = 1.000

## See Also

ftlen, ftlptim, ftsr, nsamp

## Credits

Author: Chris McCormick
Perth, Australia
December 2001

Example written by Kevin Conder.

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