| User-Defined Opcode Database |
|---|
Plays a stereo sample from two GEN01 function tables, including sample rate conversion
Download UDO FilePlays a stereo sample from two GEN01 function tables for the left and right channel, including sample rate conversion. The input parameters are similar to diskin (speed, loop play or play once, skiptime) plus a factor for amplitude scaling.
See the UDO BufPlay for playing any buffer, with some more options, but without sample rate conversion.
aL, aR BufFiPl2 ifnL, ifnR, kplay, kspeed, kvol [, iskip [, iwrap]]
ifnL - number of the function table which contains channel 1 of the sample (use GEN01 with 1 for the channel parameter - any other GEN routine will lead to an error because it does not contain the sample rate of the soundfile)
(you can also use BufFiCt2 for creating the tables for left and right channel - see the example below)
ifnR - number of the function table which contains channel 2 of the sample (use the same f-statement as for ifnL but with 2 for the channel parameter)
iskip - skiptime (sec)
iwrap - iwrap=0 plays the file is just 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 default is 1 (loop play)
kplay - 1 plays the table, 0 or any other number stops playing
kspeed - speed and direction (negative = backwards) of the pointer through the sample, e.g. 1 = normal, 2 = double (=octave higher), -0.5 = half (octave lower) and backwards
kvol - ampltude scaling factor (1 = original amplitude)
aL - audio output channel 1
aR - audio output channel 2
kfin - 1 if iwrap=0 and playback has finished, otherwise 0
opcode BufFiPl1, ak, ikkkop
ifn, kplay, kspeed, kvol, iskip, iwrap xin
;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 BufFiPl2, aak, iikkkop
ifnL, ifnR, kplay, kspeed, kvol, iskip, iwrap xin
aL, kfin BufFiPl1 ifnL, kplay, kspeed, kvol, iskip, iwrap
aR, kfin BufFiPl1 ifnR, kplay, kspeed, kvol, iskip, iwrap
xout aL, aR, kfin
endop
<CsoundSynthesizer>
<CsOptions>
-o dac
</CsOptions>
<CsInstruments>
sr = 44100
ksmps = 32
nchnls = 2
0dbfs = 1
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 BufFiPl2, aak, iikkkop
ifnL, ifnR, kplay, kspeed, kvol, iskip, iwrap xin
aL, kfin BufFiPl1 ifnL, kplay, kspeed, kvol, iskip, iwrap
aR, kfin BufFiPl1 ifnR, kplay, kspeed, kvol, iskip, iwrap
xout aL, aR, kfin
endop
opcode BufFiCt2, ii, Sooo
;creates two gen01 function tables from a stereo soundfile
Sfilenam, ifnL, ifnR, inorm xin ;filename, number of left and right ftable (0=automatic(=default)), normalization (1=yes, 0=no(=default))
igen = (inorm == 0 ? -1 : 1)
iftL ftgen ifnL, 0, 0, igen, Sfilenam, 0, 0, 1
iftR ftgen ifnR, 0, 0, igen, Sfilenam, 0, 0, 2
xout iftL, iftR
endop
instr 1
giL,giR BufFiCt2 "2_channel_file.wav"
endin
instr 2
aL,aR,kfin BufFiPl2 giL, giR, 1, p4, p5, p6, p7 ;speed vol skip wrap
if p7 == 0 && kfin == 1 then
printks "Playback finished!\n", 10
endif
outs aL, aR
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>
joachim heintz 2008/2010
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