Re: [Sndobj-devel] quick question...

[Victor L. <Vic...@nu...>]

I'd say it's OK in terms of efficiency. I would move the PushIn to outside the
inner loop and call it with DEF_VECSIZE, so you are consuming more
samples per function call. You will need to make 'sample' a block of floats.

Since you are not doing any function calls in the inner loop, it's probably
as efficient as using a SndObj (or even more).

Victor

At 10:53 25/01/2007, Rory Walsh wrote:
>Am I correct to assume that the following code which uses SndObj's
>PushIn() method is just as efficient as writing a simple class and
>calling it's DoProcess()?
>
>
>int main(int argc, char** argv)
>{
>int dur = 10;
>float* sample;
>float index;
>float incr;
>int freq=420;
>int length = 256;
>float table[256];
>
>SndObj test;
>SndRTIO output(1, SND_OUTPUT);
>SndObj mySndObj(&test);
>output.SetOutput(1, &mySndObj);
>
>for(int i=0; i < length; i++)
>table[i] = sin(i*2*PI/length);
>
>for(int i=0; i<dur*(DEF_SR/DEF_VECSIZE); i++)
>    {
>         for(int y=0;y<DEF_VECSIZE;y++)
>         {
>         *sample = 10000*table[(int)index];
>         incr = freq*length/DEF_SR;
>          index += incr;
>          while(index >= length) index -= length;
>         while(index < 0) index += length;
>         mySndObj.PushIn(sample, 1);
>         }
>         output.Write();
>    }
>return 1;
>}
>
>I'm aware of the different oscillator classes available in the SndObj
>library, and obviously building a simple class would be more elegant,
>this is just something I'm preparing for pedagogic purposes. Cheers,
>
>Rory.
>
>
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Victor Lazzarini
Music Technology Laboratory
Music Department
National University of Ireland, Maynooth