Audio Data Routing

dancing.sphinx · Apr 6, 2008, 05:58 PM

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, 06:18 PM

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

octave · Apr 6, 2008, 06:43 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.

Apr 6, 2008, 05:58 PM	#1
dancing.sphinx DriverHeaven Newbie Join Date: Feb 2008 Posts: 11 Rep Power: 0	Audio Data Routing 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? Last edited by dancing.sphinx; Apr 6, 2008 at 06:05 PM.

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Apr 6, 2008, 06:18 PM	#2
Russ HardwareHeaven Extreme Member Join Date: Jan 2005 Posts: 4,984 Rep Power: 44	No, audio data from a VSTi to the host application does not go through the DSP.

Apr 6, 2008, 06:43 PM	#3
octave DriverHeaven Junior Member Join Date: Aug 2007 Posts: 39 Rep Power: 0	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.