[PD-dev] [PD] What goes on during dsp ticks?

[Andy Farnell]

On Sun, 15 Jun 2008 09:57:00 +0900
PSPunch <shima at pspunch.com> wrote:

> 
> Sorry for accidentally sending the previous note to pd-list.

I'd love to hear this stay on list. David is asking all the
right questions, and the answers (Thomas and Iohannes)
are the kind of thing it takes weeks or months to discover in the code.

andy



> 
> Thomas,
> 
> 
> >> I hear that malloc is a "relatively" expensive task.
> >> Is it bad practice to run this each cycle, or is a kilobyte or two not a
> >> bid deal?
> 
> > That's definitely bad practice.
> > Instead of that you can do the allocation in the "dsp" callback, that's 
> > where you add your dsp processing to the signal chain. This callback 
> > will be called anytime when either the block size or sample rate changes 
> > or when the signal graph is rebuilt.
> 
> 
> Many thanks to you again, I know have it working with the way you suggest.
> 
> Being fairly new to C and Pd source, I am still at the stage where I 
> code with out understanding 100% of what I am really doing. This weekend 
> has been very adventurous so far.
> 
> Would you mind giving me directions to where I can find descriptions on 
> the concept "signal graph" and where I shall look in the code to see it 
> in action? It has nothing to do with the GUI object "graph" does it?
> 
> 
> --
> David Shimamoto
> 
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