| User-Defined Opcode Database |
|---|
Records in a stereo buffer (= two function tables)
Download UDO FileRecords in a stereo buffer (two function tables), with optional start point, end point, and wrap (= loop record).
kfin BufRec2 ainL, ainR, iftL, iftR, krec, kstart, kend, kwrap
iftL, iftR - function tables for recording
ainL, ainR - audio signals to record
krec - 1 for recording, 0 (or any other number) stops recording
kstart - begin of recording into the function table in seconds
kend - end of recording into the function table in seconds
kwrap - if 1, recording wraps between kend and the beginning of the buffer (see th examples below for instr 4); if 0 (or any other number), record stops at kend
kfin - 1 if record has finished
opcode BufRec1, k, aikkkk ain, ift, krec, kstart, kend, kwrap xin setksmps 1 kendsmps = kend*sr ;end point in samples kendsmps = (kendsmps == 0 || kendsmps > ftlen(ift) ? ftlen(ift) : kendsmps) kfinished = 0 krec init 0 knew changed krec ;1 if record just started if krec == 1 then if knew == 1 then kndx = kstart * sr - 1 ;first index to write minus one endif if kndx >= kendsmps-1 && kwrap == 1 then kndx = -1 endif if kndx < kendsmps-1 then kndx = kndx + 1 andx = kndx tabw ain, andx, ift else kfinished = 1 endif endif xout kfinished endop opcode BufRec2, k, aaiikkkk ainL, ainR, iftL, iftR, krec, kstart, kend, kwrap xin kfinished BufRec1 ainL, iftL, krec, kstart, kend, kwrap kfinished BufRec1 ainR, iftR, krec, kstart, kend, kwrap xout kfinished endop
<CsoundSynthesizer>
<CsOptions>
-d -iadc -odac
</CsOptions>
<CsInstruments>
sr = 44100
ksmps = 32
nchnls = 2
0dbfs = 1
opcode BufRec1, k, aikkkk
ain, ift, krec, kstart, kend, kwrap xin
setksmps 1
kendsmps = kend*sr ;end point in samples
kendsmps = (kendsmps == 0 || kendsmps > ftlen(ift) ? ftlen(ift) : kendsmps)
kfinished = 0
krec init 0
knew changed krec ;1 if record just started
if krec == 1 then
if knew == 1 then
kndx = kstart * sr - 1 ;first index to write minus one
endif
if kndx >= kendsmps-1 && kwrap == 1 then
kndx = -1
endif
if kndx < kendsmps-1 then
kndx = kndx + 1
andx = kndx
tabw ain, andx, ift
else
kfinished = 1
endif
endif
xout kfinished
endop
opcode BufRec2, k, aaiikkkk
ainL, ainR, iftL, iftR, krec, kstart, kend, kwrap xin
kfinished BufRec1 ainL, iftL, krec, kstart, kend, kwrap
kfinished BufRec1 ainR, iftR, krec, kstart, kend, kwrap
xout kfinished
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
opcode BufCt2, ii, ioo
;creates a function table of ilen seconds for stereo recording
ilen, inumL, inumR xin ;inum=0 (default): automatic generated number, any other positive number is the number of the function table
iftL ftgen inumL, 0, -(ilen*sr), 2, 0
iftR ftgen inumR, 0, -(ilen*sr), 2, 0
xout iftL, iftR
endop
opcode KeyOnce, kk, kkk
;returns '1' just in the k-cycle a certain key has been pressed (kdown) or released (kup)
key, kd, kascii xin ;sensekey output and ascii code of the key (e.g. 32 for space)
knew changed key
kdown = (key == kascii && knew == 1 && kd == 1 ? 1 : 0)
kup = (key == kascii && knew == 1 && kd == 0 ? 1 : 0)
xout kdown, kup
endop
instr 1 ;creates the buffer and starts instrument 2
prints "PRESS THE SPACE BAR FOR RECORDING!\n"
giL,giR BufCt2 3 ;buffer of 3 seconds
key,kd sensekey
ktr,k0 KeyOnce key, kd, 32 ;ktr becomes '1' when space bar is pressed
schedkwhen ktr, .1, 5, 2, 0, 6 ;starts instr 2 for record and play
endin
instr 2 ;records for 3 seconds and plays it back
prints "RECORDING AND PLAYING BACK AFTER 3 SECONDS!\n"
krec init 0 ;reset krec for multiple triggering
ainL inch 1 ;audio input from channel 1 ...
ainR inch 2 ;... and 2
kplay BufRec2 ainL, ainR, giL, giR, krec, 0, 0, 0 ;record buffer without wrap
aL,aR,k0 BufPlay2 giL, giR, kplay, 1, 1, 0, 0, 0 ;play back buffer
outs aL, aR
krec = 1 ;skip the first k-cycle for reset, then record
endin
</CsInstruments>
<CsScore>
i 1 0 1000
</CsScore>
</CsoundSynthesizer>
joachim heintz 2010
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