89 lines
2.1 KiB
Text
89 lines
2.1 KiB
Text
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#lang scribble/manual
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@(require (for-label racket))
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@title{FreeSelfWhenDone}
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Free the enclosing synth when a UGen is finished@section{related}
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Classes/Done, Classes/PauseSelfWhenDone, Classes/Done
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@section{categories}
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UGens>Synth control
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@section{description}
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Some UGens set a 'done' flag when they are finished playing.
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FreeSelfWhenDone will free the enclosing synth when this flag is set to true.
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See link::Classes/Done:: for a complete list of these UGens.
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Note that many of these UGens have doneActions, which are another way of accomplishing the same thing. See link::Classes/Done:: for more detail.
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@section{note}
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One must be careful when using binary operations on UGens with done flags, as these will return a link::Classes/BinaryOpUGen::, and thus prevent the done flag from being accessible. See example below. ::
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@section{classmethods}
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@section{private}
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categories
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@section{method}
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kr
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@section{argument}
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src
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the UGen to check for done.
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@section{examples}
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@racketblock[
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s.boot;
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// simple example
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(
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{ var env;
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env = Line.kr(0, 1, 1);
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FreeSelfWhenDone.kr(env); // free synth at end of line
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SinOsc.ar(200, 0, 0.5) * env
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}.play;
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)
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// the previous example works, because FreeSelfWhenDone operates on the Line
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// this version won't work
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(
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{ var env, output;
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env = Line.kr(0, 1, 1);
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output = SinOsc.ar(200, 0, 0.5) * env;
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output.postln; // output is a BinaryOpUGen, which has no 'done' flag
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FreeSelfWhenDone.kr(output); // won't ever be done
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output
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}.play;
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)
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// record for four seconds
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b = Buffer.alloc(s, 44100 * 4.0, 1);
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(
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SynthDef("help-RecordBuf",{ arg out=0,bufnum=0;
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var formant, recbuf;
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formant = Formant.ar(XLine.kr(400,1000, 4), 2000, 800, 0.125);
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recbuf = RecordBuf.ar(formant, bufnum, recLevel: Line.kr(1, 1), loop: 0);
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// The RecordBuf doesn't loop, so you can check it for 'done' status
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FreeSelfWhenDone.kr(recbuf);
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}).play(s,[\out, 0, \bufnum, b]);
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)
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// play it back
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(
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SynthDef("help-RecordBuf play",{ arg out=0,bufnum=0;
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var playbuf;
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playbuf = PlayBuf.ar(1,bufnum);
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FreeSelfWhenDone.kr(playbuf); // frees the synth when the PlayBuf is finished
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Out.ar(out, playbuf);
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}).play(s,[\out, 0, \bufnum, b]);
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)
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::
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]
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