| User-Defined Opcode Database |
|---|
creates two non deferred function tables from a stereo soundfile and returns the length
Download UDO FileCreates two non deferred function tables from a stereo (or any multichannel) soundfile and returns the length as table size (= sample frames). This can be useful is you want to use opcodes (for instance table3) which do not work with deferred size function tables
iftL, iftR, ilen BufFiCtNd2 Sfilenam [, ichnL [, ichnR [, iftnumL [, iftnumR [, inorm]]]]]
Sfilenam - file name or path as string
ichnL, ichnR - channels in Sfilenam to read (default = 1 for ichnL and 2 for ichnR)
iftnumL, iftnumR - 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
iftL, iftR - output table number
ilen - length of the function table created (which is also the length of the soundfile in samples)
opcode BufFiCtNd2, iii, Sjjpoo
Sfilenam, ichnL, ichnR, iftnumL, iftnumR, inorm xin
ichnL = (ichnL == -1 ? 1 : ichnL) ;default for chnL = 1
ichnR = (ichnR == -1 ? 2 : ichnR) ;default for chnR = 2
igen = (inorm == 0 ? -1 : 1)
ifttmpL ftgen 0, 0, 0, igen, Sfilenam, 0, 0, ichnL
ifttmpR ftgen 0, 0, 0, igen, Sfilenam, 0, 0, ichnR
ilen tableng ifttmpL
iftL ftgen iftnumL, 0, -ilen, -2, 0
iftR ftgen iftnumR, 0, -ilen, -2, 0
vcopy_i iftL, ifttmpL, ilen
vcopy_i iftR, ifttmpR, ilen
ftfree ifttmpL, 0
ftfree ifttmpR, 0
xout iftL, iftR, ilen
endop
<CsoundSynthesizer>
<CsOptions>
-d -o dac
</CsOptions>
<CsInstruments>
sr = 44100
ksmps = 32
nchnls = 2
0dbfs = 1
opcode BufFiCtNd2, iii, Sjjpoo
;creates two non deferred function tables from a soundfile and returns their length
Sfilenam, ichnL, ichnR, iftnumL, iftnumR, inorm xin ;filename, channels (default=1,2), number of ftables (0=automatic(=default)), normalization (1=yes, 0=no(=default))
ichnL = (ichnL == -1 ? 1 : ichnL) ;default for chnL = 1
ichnR = (ichnR == -1 ? 2 : ichnR) ;default for chnR = 2
igen = (inorm == 0 ? -1 : 1)
ifttmpL ftgen 0, 0, 0, igen, Sfilenam, 0, 0, ichnL
ifttmpR ftgen 0, 0, 0, igen, Sfilenam, 0, 0, ichnR
ilen tableng ifttmpL
iftL ftgen iftnumL, 0, -ilen, -2, 0
iftR ftgen iftnumR, 0, -ilen, -2, 0
vcopy_i iftL, ifttmpL, ilen
vcopy_i iftR, ifttmpR, ilen
ftfree ifttmpL, 0
ftfree ifttmpR, 0
xout iftL, iftR, ilen
endop
opcode BufPlay1, ak, ikkkkkk
ift, kplay, kspeed, kvol, kstart, kend, kwrap xin
;kstart = begin of playing the buffer in seconds
;kend = end of playing in seconds. 0 means the end of the table
;kwrap = 0: no wrapping. stops at kend (positive speed) or kstart (negative speed). this makes just sense if the direction does not change and you just want to play the table once
;kwrap = 1: wraps between kstart and kend
;kwrap = 2: wraps between 0 and kend
;kwrap = 3: wraps between kstart and end of table
;CALCULATE BASIC VALUES
kfin init 0
iftlen = ftlen(ift)/sr ;ftlength in seconds
kend = (kend == 0 ? iftlen : kend) ;kend=0 means end of table
kstart01 = kstart/iftlen ;start in 0-1 range
kend01 = kend/iftlen ;end in 0-1 range
kfqbas = (1/iftlen) * kspeed ;basic phasor frequency
;DIFFERENT BEHAVIOUR DEPENDING ON WRAP:
if kplay == 1 && kfin == 0 then
;1. STOP AT START- OR ENDPOINT IF NO WRAPPING REQUIRED (kwrap=0)
if kwrap == 0 then
kfqrel = kfqbas / (kend01-kstart01) ;phasor freq so that 0-1 values match distance start-end
andxrel phasor kfqrel ;index 0-1 for distance start-end
andx = andxrel * (kend01-kstart01) + (kstart01) ;final index for reading the table (0-1)
kfirst init 1 ;don't check condition below at the first k-cycle (always true)
kndx downsamp andx
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
;for negative speed, check if this index is higher than the previous one
else
kprevndx = (kprevndx == kstart01 ? kend01 : kprevndx)
if kfirst == 0 && kspeed < 0 && kndx > kprevndx then
kfin = 1
endif
kfirst = 0 ;end of first cycle in wrap = 0
endif
;sound out if end of table has not yet reached
asig table3 andx, ift, 1
kprevndx = kndx ;next previous is this index
;2. WRAP BETWEEN START AND END (kwrap=1)
elseif kwrap == 1 then
kfqrel = kfqbas / (kend01-kstart01) ;same as for kwarp=0
andxrel phasor kfqrel
andx = andxrel * (kend01-kstart01) + (kstart01)
asig table3 andx, ift, 1 ;sound out
;3. START AT kstart BUT WRAP BETWEEN 0 AND END (kwrap=2)
elseif kwrap == 2 then
kw2first init 1
if kw2first == 1 then ;at first k-cycle:
reinit wrap3phs ;reinitialize for getting the correct start phase
kw2first = 0
endif
kfqrel = kfqbas / kend01 ;phasor freq so that 0-1 values match distance start-end
wrap3phs:
andxrel phasor kfqrel, i(kstart01) ;index 0-1 for distance start-end
rireturn ;end of reinitialization
andx = andxrel * kend01 ;final index for reading the table
asig table3 andx, ift, 1 ;sound out
;4. WRAP BETWEEN kstart AND END OF TABLE(kwrap=3)
elseif kwrap == 3 then
kfqrel = kfqbas / (1-kstart01) ;phasor freq so that 0-1 values match distance start-end
andxrel phasor kfqrel ;index 0-1 for distance start-end
andx = andxrel * (1-kstart01) + kstart01 ;final index for reading the table
asig table3 andx, ift, 1
endif
else ;if either not started or finished at wrap=0
asig = 0 ;don't produce any sound
endif
xout asig*kvol, kfin
endop
opcode BufPlay2, aak, iikkkkkk
iftL, iftR, kplay, kspeed, kvol, kstart, kend, kwrap xin
aL, kfin BufPlay1 iftL, kplay, kspeed, kvol, kstart, kend, kwrap
aR, kfin BufPlay1 iftR, kplay, kspeed, kvol, kstart, kend, kwrap
xout aL, aR, kfin
endop
instr 1
giL,giR,ilen BufFiCtNd2 "2_channel_file.wav" ;creates two non-deferred function tables containing the sample
endin
instr 2
aL,aR,k0 BufPlay2 giL, giR, 1, p4, 1, p5, p6, p7 ;speed (vol) start end wrap
outs aL,aR
endin
</CsInstruments>
<CsScore>
i 1 0 41
; speed start end wrap
i 2 0 5 1 0 0 0 ;play all but stop (wrap=0) after reaching the end
i . 6 5 2 1 2 0 ;play from sec 1 to 2 in the file in double speed
i . 12 5 -.5 0.5 2 0 ;play from sec 2 to 0.5 backwards, half speed
i . 18 5 1 0.5 2 1 ;wrap between start and end
i . 24 5 -1 0.5 2 1 ;the same backwards
i . 30 5 1 1 2 2 ;start at sec 1, then wrap between 0 and end
i . 36 5 1 1 2 3 ;wrap between start and end of table
e
</CsScore>
</CsoundSynthesizer>
joachim heintz 2010
| Previous | Home | Next |
| BufFiCtNd1 | BufFiPl1 |