Audio Data Routing

dancing.sphinx · Apr 6, 2008, 11:58 AM

In case of 44.1 kHz ASIO does any resample happens during audio transfer between VSTi and its Host, i.e. does audio goes through DSP?

Russ · Apr 6, 2008, 12:18 PM

No, audio data from a VSTi to the host application does not go through the DSP.

octave · Apr 6, 2008, 12:43 PM

There are two different questions:
Q1) do the data streams between a VST host and a plugin go through sound hardware?
No. Consider non-realtime rendering. More specifically, routing to a VST is not to ASIO, and the other way round. The DSP view shows you what goes through the DSP. It doesn't show what doesn't go, right? ;-)
Q2) is it possible for the host to run a VST plugin at a different rate than the project rate and resample before the host's audio engine?
Even if the spec allows this, I don't think it is used. I'm almost sure that if the VSTi plays back wav's which are at a different rate than the requested rate, it is the VSTi plugin which has to do the resampling. But then, maybe I'm wrong.

UPDATE: As for Q1, Russ answered in the meanwhile.