User-Defined Opcode Database

BufFiCt4

creates fout gen01 function table from a four channel soundfile

Download UDO File

Description

Creates four gen01 function table from a four channel soundfile. This is nothing else than a simplification of creating the same with a ftgen statement.
Use BufFiCtNd to create a non-deferred function table from a soundfile

Syntax

ift1, ift2, ift3, ift4 BufFiCt4 Sfilenam [, ifn1 [, ifn2 [, ifn3 [, ifn4 [, inorm]]]]]

Initialization

Sfilenam - file name or path as string
ifn1 ... ifn4 - if zero (which is also the default), the number of the function table is given by Csound. Any other positive integer will represent the function table, but the user must take care of not using a number twice
inorm - if zero, the table is not normalized. This is also the default, while any other number creates a normalized table
ift1 ... ift4 - output table numbers

Code

  opcode BufFiCt4, iiii, Sooooo
Sfilenam, ifn1, ifn2, ifn3, ifn4, inorm xin ;filename, numbers of ftables (0=automatic(=default)), normalization (1=yes, 0=no(=default))
igen      =         (inorm == 0 ? -1 : 1)
ift1      ftgen     ifn1, 0, 0, igen, Sfilenam, 0, 0, 1
ift2      ftgen     ifn2, 0, 0, igen, Sfilenam, 0, 0, 2
ift3      ftgen     ifn3, 0, 0, igen, Sfilenam, 0, 0, 3
ift4      ftgen     ifn4, 0, 0, igen, Sfilenam, 0, 0, 4
          xout      ift1, ift2, ift3, ift4  
  endop

Examples

<CsoundSynthesizer>
<CsOptions>
-o dac
</CsOptions>
<CsInstruments>
sr = 44100
ksmps = 32
nchnls = 2
0dbfs = 1


  opcode BufFiCt4, iiii, Sooooo
;creates four gen01 function tables from a four channel soundfile  
Sfilenam, ifn1, ifn2, ifn3, ifn4, inorm xin ;filename, numbers of ftables (0=automatic(=default)), normalization (1=yes, 0=no(=default))
igen      =         (inorm == 0 ? -1 : 1)
ift1      ftgen     ifn1, 0, 0, igen, Sfilenam, 0, 0, 1
ift2      ftgen     ifn2, 0, 0, igen, Sfilenam, 0, 0, 2
ift3      ftgen     ifn3, 0, 0, igen, Sfilenam, 0, 0, 3
ift4      ftgen     ifn4, 0, 0, igen, Sfilenam, 0, 0, 4
          xout      ift1, ift2, ift3, ift4  
  endop

  opcode BufFiPl1, ak, ikkkop
ifn, kplay, kspeed, kvol, iskip, iwrap xin
;plays a file from a buffer. if iwrap=0 the file is just played once (stops at end of table for positive speed and at start of table for negative speed), or stops if the direction of speed changes. the sample rate of the sample is converted to the sample rate of the orchestra
;SAFETY CHECK IF THE TABLE IS REALLY GENERATED BY GEN01
if ftsr(ifn) == 0 then
 prints    "ERROR!\n FUNCTION TABLE %d HAS NO SAMPLE RATE VALUE (NOT GENERATED BY GEN01?)\n", ifn
 prints    "PERFORMANCE HAS BEEN TURNED OF.\n"
 turnoff
endif
iftlen    =         ftlen(ifn)/ftsr(ifn)
kcps      =         kspeed / iftlen
iphs      =         iskip / iftlen
kfin      init      0
;CALCULATIONS ONLY REQUIRED FOR WRAP=0
if iwrap == 0 then
kndx      phasor    kcps, iphs
kfirst    init      1 ;don't check condition below at the first k-cycle (always true)
kprevndx  init      0
 ;end of table check:
  ;for positive speed, check if this index is lower than the previous one
  if kfirst == 0 && kspeed > 0 && kndx < kprevndx then 
kfin      =         1
  else
 ;for negative speed, check if this index is higher than the previous one
kprevndx  =         (kprevndx == iphs ? 1 : kprevndx) 
   if kfirst == 0 && kspeed < 0 && kndx > kprevndx then
kfin      =         1
   endif
kfirst    =         0 ;end of first cycle in wrap = 0
  endif
kprevndx  =         kndx ;next previous is this index
endif
;READING THE SOUND WITH POSCIL3
if kplay == 1 && kfin == 0 then
asig      poscil3   kvol, kcps, ifn, iphs
else
asig      =         0
endif
          xout      asig, kfin
  endop
  
  opcode BufFiPl4, aaaak, iiiikkkop
ifn1, ifn2, ifn3, ifn4, kplay, kspeed, kvol, iskip, iwrap xin
a1, kfin  BufFiPl1  ifn1, kplay, kspeed, kvol, iskip, iwrap
a2, kfin  BufFiPl1  ifn2, kplay, kspeed, kvol, iskip, iwrap
a3, kfin  BufFiPl1  ifn3, kplay, kspeed, kvol, iskip, iwrap
a4, kfin  BufFiPl1  ifn4, kplay, kspeed, kvol, iskip, iwrap
          xout      a1, a2, a3, a4, kfin
  endop
    
	
instr 1
gi1,gi2, gi3, gi4   BufFiCt4  "4_channel_file.wav"
endin

instr 2
a1,a2,a3,a4,kfin BufFiPl4	 gi1, gi2, gi3, gi4, 1, p4, p5/2, p6, p7 ;speed vol skip wrap
 if p7 == 0 && kfin == 1 then
          printks   "Playback finished!\n", 10
 endif
          outs       a1+a2, a3+a4
endin


</CsInstruments>
<CsScore>
i 1 0 21
;         speed vol skip wrap
i 2 0 5   1.2   1   0    1
i . 6 .   .7    1   0    0
i . 12 .  -1    .5  0    0
i . 16 .  1     1   1.2  0
e
</CsScore>
</CsoundSynthesizer>

Credits

joachim heintz 2010


Previous Home Next
BufFiCt8   BufFiCt2