[LAD] Plugin buffer size restrictions
jef at synthedit.com
Wed May 30 03:03:07 UTC 2012
> From: Fons Adriaensen <fons at linuxaudio.org>
> Subject: Re: [LAD] Plugin buffer size restrictions
> On Mon, May 28, 2012 at 06:05:20PM +0300, Stefano D'Angelo wrote:
> > IMO it's easily said: if control rate < audio rate it's plugin's
> > responsibility, otherwise the host feeds upsampled/filtered control
> > signals at audio rate to the plugin and all problems evaporate...
> The don't evaporate, they explode.
> Take a filter plugin. Calculating the actual filter coefficients from
> the 'user' parameters (frequency, gain, etc..) can easily be
> 10..1000 times more complex than actually using those coefficients to
> process one sample. So you really don't want to do that at the audio
> sample rate.
True, But with synths at least, recalculating the filter at audio rate is
routine these days. Admittedly we are pre-calculating the full range of
coefficients in advance.
You do get *very* nice filter sweeps and blips at full audio-rate
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