linuxaudio.org

On 11/14/2010 11:27 AM, Paul Davis wrote:

quoted text
> On Sun, Nov 14, 2010 at 6:18 AM, Rui Nuno Capela  wrote:

>

>> as said, for qtractor the panning coefficients are computed _only_ when

>> the pan widget slider changes. the simple one-shot calculation is

>> carried out in gui thread context so it does not add a cycle whatsoever

>> to dsp load ;)

>

> this would suggest that either you don't do panning automation or you

> store panning automation as precomputed values?

>

> ardour behaves as you described for the case without automation, but

> during automation playback, it does per-sample computation of pan

> positions based on automation events, and this occurs in the audio

> thread(s).

> 

yes, there's no automation in qtractor as of yet. anyhow, panning

coefficients are indeed pre-computed into per-channel gain, which in

turn is applied in per-sample computation, same as ardour i guess. with

or without automation.
when automation gets into the picture, then yes it is in my mind design

that it will have this sin/cos computation re-evaluated on a per-buffer

or process-cycle basis. even though, it's all ordinary cheap for

nowadays cpus :)
byee

--

rncbc aka Rui Nuno Capela

rncbc@rncbc.org

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