[haiku] Re: A little audio survey
- From: pete.goodeve@xxxxxxxxxxxx
- To: haiku@xxxxxxxxxxxxx
- Date: Wed, 20 Jul 2011 18:22:34 -0700
On Thu, Jul 21, 2011 at 12:38:51AM +0200, Axel Dörfler wrote:
> pete.goodeve@xxxxxxxxxxxx wrote:
> > wonder if the silence only happens
> > on single-core units? Axel -- what's yours?
>
> I have a quad core where this happens.
Well... that scotches that theory then. So if Sean is not getting a hiatus,
and you are, what the heck is the difference?
>
>
> I am not able to produce glitches with HDA (as long as the serial output
> is turned off).
> I guess its buffer size is large enough - it has been developed
> primarily on Haiku, anyway.
>
(... or my thought that multicore might protect from glitches reaching
the audio chain...)
I took a look at the HDA source, and I see that the buffer size is set
so that its period is a little under 1/20 sec (2048 frames at 44100 fps
-- adjusted for different frame rates). Experimentally the latency
at the mixer (before glitches) is essentially twice the buffer period
-- I assume because of the one-buffer delay I remember being mentioned --
so I guess HDA users should see a latency of ~100 msec. [And that's
rather heavy for me!]
Be nice to get some data points from others... Anybody?
-- Pete --
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