Re: [Jack-Devel] extra latency compensation

Le 19 avr. 2011 à 06:20, Paul Davis a écrit :

> On Tue, Apr 19, 2011 at 12:14 AM, Chris Caudle <[hidden]> wrote:
> 
>> I did not understand the way latency is communicated, I thought ALSA would
>> provide a latency number for an interface, but you actually have to
>> measure it yourself.
> 
> ALSA can't know this. Determining the number requires the user
> establishes a loopback signal path, which clearly can't be assumed at
> any point during driver initialization, setup, or what have you.
> Remember that for any digital out, the converters don't even live on
> the audio interface itself, so even if there was a standard protocol
> to discover "physical latency of the soundcard" it would fail for
> digital signal paths since it would rely on components not connected
> via the PCI bus.
> 
> --p
> 

I'm wondering now how they do on OSX, since interfaces can be asked for their "input latency", "input latency offset", "output latency", "output latency offset".

Stéphane

1303196388.5233_0.ltw:2,a <46A18BAD-1370-4F5A-9C72-C475056C938F at grame dot fr>