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Old 08-14-2019, 08:54 AM   #1
Nonlinear
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Default Any way to run computations outside the audio thread in WDL-OL?

I want to add a spectrum graph to my plugins and would prefer to process the FFT outside the audio thread.

Is there any way to run code outside the audio processing block in WDL-OL? I have tried placing code inside "On Idle()" but DAWs ignored it (did nothing).

Any other suggestions?

Last edited by Nonlinear; 08-14-2019 at 09:25 AM.
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Old 08-14-2019, 10:20 AM   #2
Xenakios
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You would likely need to launch and manage your own thread. The latter part is likely going to be difficult. If there's any way for you to avoid using an additional thread, that is the best.

You could try doing the calculation in the GUI thread with a timer, but at least back in IPlug1 there was no convenient way to add a custom timer. The plugin OnIdle etc stuff is not to be trusted, the hosts may or may not call those methods. If they do, they may not do so often enough or they do it too often etc...
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Old 08-19-2019, 01:37 PM   #3
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I'll be implementing a spectrum analyzer probably this week. If you are not picky about your attack and release settings being super accurate, you should be able to do the heavy lifting in the graphics thread.
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Old 08-20-2019, 10:39 AM   #4
Nonlinear
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Quote:
Originally Posted by bozmillar View Post
I'll be implementing a spectrum analyzer probably this week. If you are not picky about your attack and release settings being super accurate, you should be able to do the heavy lifting in the graphics thread.
Please let me know how it works out! Besides running the FFT itself you then have to sweep through all the "bins" to calculate magnitude - apply an envelope detector of some sort to all of them (512+ IIR filters?) - and then plot this with an interpolated curve.

Seems pretty CPU intensive to me.
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Old 08-20-2019, 11:05 AM   #5
bozmillar
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Quote:
Originally Posted by Nonlinear View Post
Seems pretty CPU intensive to me.
It's not that bad because you are running these calculations per window, not per sample. If your window size is 1024, you aren't running 1024 envelopes processes per sample.

If you aren't worried about the time constants being tight, you run your envelopes in the GUI thread. You can always run your interpolation in the GUI thread.

If you want your time constants correct, you can set it up like this:

Audio thread: FFT->magnitued->envelope

GUI thread: interpolation/smoothing.
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