nsamp — Returns the number of samples loaded into a stored function table number.
Returns the number of samples loaded into stored function table number x by GEN01. This is useful when a sample is shorter than the power-of-two function table that holds it. New in Csound version 3.49.
As of Csound version 5.02, nsamp works with deferred-length function tables (see GEN01).
nsamp differs from ftlen in that nsamp gives the number of sample frames loaded, while ftlen gives the total number of samples. For example, with a stereo sound file of 10000 samples, ftlen() would return 19999 (i.e. a total of 20000 mono samples, not including a guard point), but nsamp() returns 10000.
Here is an example of the nsamp opcode. It uses the file nsamp.csd, kickroll.wav. and fox.wav.
Example 549. Example of the nsamp 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 -odac ;;;realtime audio out ;-iadc ;;;uncomment -iadc if realtime audio input is needed too ; For Non-realtime ouput leave only the line below: ; -o nsamp.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> ; slightly adapted example from Jonathan Murphy Dec 2006 sr = 44100 ksmps = 32 nchnls = 2 0dbfs = 1 instr 1 ifn = p4 ; table number ilen = nsamp(ifn) prints "actual numbers of samples = %d\n", ilen itrns = 1 ; no transposition ilps = 0 ; loop starts at index 0 ilpe = ilen ; ends at value returned by nsamp above imode = 1 ; loops forward istrt = 0 ; commence playback at index 0 samples ; lphasor provides index into f1 alphs lphasor itrns, ilps, ilpe, imode, istrt atab tablei alphs, ifn outs atab, atab endin </CsInstruments> <CsScore> f 1 0 262144 1 "kickroll.wav" 0 4 1 ;stereo file in table, with lots of zeroes f 2 0 262144 1 "fox.wav" 0 4 1 ;mono file in table, with lots of zeroes i1 0 10 1 i1 + 10 2 e </CsScore> </CsoundSynthesizer>
Since the stereo audio file “kickroll.wav” has 37792 samples and the mono file “fox.wav” has 121569 samples, its output should include lines like these:
actual numbers of samples = 37792 actual numbers of samples = 121569