Some UGens set a 'done' flag when they are finished playing. FreeSelfWhenDone will free the enclosing synth when this flag is set to true.
See Done for a complete list of these UGens.
Note that many of these UGens have doneActions, which are another way of accomplishing the same thing. See Done for more detail.
| src |
the UGen to check for done. |
s.boot;
// simple example
(
{ var env;
env = Line.kr(0, 1, 1);
FreeSelfWhenDone.kr(env); // free synth at end of line
SinOsc.ar(200, 0, 0.5) * env
}.play;
)
// the previous example works, because FreeSelfWhenDone operates on the Line
// this version won't work
(
{ var env, output;
env = Line.kr(0, 1, 1);
output = SinOsc.ar(200, 0, 0.5) * env;
output.postln; // output is a BinaryOpUGen, which has no 'done' flag
FreeSelfWhenDone.kr(output); // won't ever be done
output
}.play;
)
// record for four seconds
b = Buffer.alloc(s, 44100 * 4.0, 1);
(
SynthDef("help-RecordBuf",{ arg out=0,bufnum=0;
var formant, recbuf;
formant = Formant.ar(XLine.kr(400,1000, 4), 2000, 800, 0.125);
recbuf = RecordBuf.ar(formant, bufnum, recLevel: Line.kr(1, 1), loop: 0);
// The RecordBuf doesn't loop, so you can check it for 'done' status
FreeSelfWhenDone.kr(recbuf);
}).play(s,[\out, 0, \bufnum, b]);
)
// play it back
(
SynthDef("help-RecordBuf play",{ arg out=0,bufnum=0;
var playbuf;
playbuf = PlayBuf.ar(1,bufnum);
FreeSelfWhenDone.kr(playbuf); // frees the synth when the PlayBuf is finished
Out.ar(out, playbuf);
}).play(s,[\out, 0, \bufnum, b]);
)