Re: [LAD] [Jack-Devel] jack2's dbus name

On Thu, 18.06.09 23:27, Jussi Laako (jussi@email-addr-hidden) wrote:

>
> Lennart Poettering wrote:
> > If an application can send PA data in larger blocks then we are happy
> > about it and take it. Of course, if the application needs low
> > latencies then it shouldn't pass huge blocks to us, but instead many
>
> No, generally data needs to be fed _to_ application immediately when it
> becomes available after A/D conversion (PCI DMA completion interrupt).
> Application(s) process the data and it is ought to go to D/A conversion
> on next hardware interrupt (PCI DMA reprogram interrupt), along with
> time-synchronous data from other applications. This creates total
> latency of inputhw+blocksize+outputhw. Generally input and output
> latencies should be around few tens of samples (due to delta-sigma
> converter resampling filters etc). And generally blocksize is also kept
> around 64 or so.

Yeah? And this matters how to PA?

Lennart

--
Lennart Poettering                        Red Hat, Inc.
lennart [at] poettering [dot] net
http://0pointer.net/lennart/           GnuPG 0x1A015CC4
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