Re: input error(?) on plugin

ahhh. thanks so much, james. that clears so much up...
adam


On Aug 22, 2004, at 7:42 PM, James McCartney wrote:

> On Aug 22, 2004, at 12:04 PM, adam overton wrote:
>
> > hello there.
> >
> > i think i might be going crazy...
> >
> > so below is a super tiny plugin that just prints out the input 
> > samples that it's given to the message window. i'm just giving the 
> > Ugen a static input value of 0.0, yet it reports a value of 8.0000000 
> > on the 5th sample and the 17th sample ... for every block...
>
> If the input is a scalar there will be only one value at the input, 
> there will be no 5th sample or 17th sample. You're lucky you didn't 
> just crash.
>
> > // A Ctor usually does 3 things.
> > // 1. set the calculation function.
> > // 2. initialize the unit generator state variables.
> > // 3. calculate one sample of output.
> > void TestInput_Ctor(TestInput* unit)
> > {
> >
> >         // 1. set the calculation function.
> >         SETCALC(TestInput_next);
>
> You need to have a separate calculation function for whether the input 
> is a buffer (audio rate) or a scalar (control rate, scalar rate).
> Look to see how other ugens test the input rates and select a 
> calculation function this. For example:
>         if (unit->mCalcRate == calc_FullRate && INRATE(0) != calc_FullRate) {
>                 SETCALC(Trig_next_k);
>         } else {
>                 SETCALC(Trig_next);
>         }
>
>
> Or alternately you can implement a checkInputs method in your SC class 
> to disallow scalar inputs if the ugen is audio rate. For example:
>
>         checkInputs {
>                 if (rate == 'audio' and: {inputs.at(1).rate != 'audio'}, {
>  			^("phase input is not audio rate: " + inputs.at(1) + 
> inputs.at(1).rate);
>                 });
>                 ^nil
>         }
>
>
>
> --
> --- james mccartney   james-M9HdPQXNfxq9Zq0HfjR8jw@xxxxxxxxxxxxxxxx   
> <http://www.audiosynth.com>
> SuperCollider - a real time audio synthesis programming language
>
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