tablecopy — Simple, fast table copy opcode.
kdft -- Destination function table.
ksft -- Number of source function table.
tablecopy -- Simple, fast table copy opcode. Takes the table length from the destination table, and reads from the start of the source table. For speed reasons, does not check the source length - just copies regardless - in “wrap” mode. This may read through the source table several times. A source table with length 1 will cause all values in the destination table to be written to its value.
tablecopy cannot read or write the guardpoint. To read it use table, with ndx = the table length. Likewise use table write to write it.
To write the guardpoint to the value in location 0, use tablegpw.
This is primarily to change function tables quickly in a real-time situation.
Here is an example of the tablecopy opcode. It uses the file tablecopy.csd.
Example 1056. Example of the tablecopy 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 tablecopy.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> sr = 44100 ksmps = 32 nchnls = 2 0dbfs = 1 ;after an example from Jonathan Murphy gilen = 7 gilist ftgen 1, 0, gilen + 1, -2, 2, 3, 4, 5, 6, 7 ;only 6 elements, so 1 is doubled gitmp ftgen 2, 0, gilen + 1, -2, 0 ;empty table gkmax init gilen seed 0 ;each time different instr 1 ktrig metro 3 ;trigger values krnd random 0, gkmax if (ktrig == 1) then kval table krnd, gilist tablew 0, krnd, gilist kread = 0 kwrite = 0 start: knew table kread, gilist if (knew != 0) then tablew knew, kwrite, gitmp kwrite = kwrite + 1 endif kread = kread + 1 if (kread <= gilen) kgoto start tablecopy gilist, gitmp ;fill with zeroes gkmax = gkmax - 1 endif printk2 kval if (gkmax < 0) then event "i", 2, 0, 1/kr ;when ready, then stop endif asig vco2 .5, 40*kval ;sound generation outs asig, asig endin instr 2 exitnow endin </CsInstruments> <CsScore> i1 0 5 e </CsScore> </CsoundSynthesizer>
Its output should include a lines like these:
i1 5.00000 i1 3.00000 i1 2.00000 i1 4.00000 i1 7.00000 i1 6.00000 i1 7.00000