measuring audio latency?

[Dan Kegel]

On Wed, Mar 10, 2010 at 12:25 AM, Reece Dunn <msclrhd at googlemail.com> wrote:
>>>> Yes, absolutely, but it'd be good to make this measurement easy
>>>> to repeat by anybody interested.  To do that, let's just loop the
>>>> audio output back into the audio input.  The user will have to
>>>> provide a loopback cable (or, worst case, put his mike right up
>>>> to the speaker, and allow for a tiny bit of extra latency
>>>> from that).
>
> But if all you are interested in is the relative latency changes, then
> any additional latency effects should not matter as long as that
> latency added is constant.

Right.

> What is being checked is that the latency of wine+OpenAL is not
> noticeably greater than the current wine+ALSA implementation (that is,
> OpenAL has a latency that is at worst equal to ALSA as used by wine to
> within a certain tolerance for error).

Yes.
Ideally we'd also run the app with other combinations
as well (say, wine+OSS, or XP+ASIO, or Windows 7)
to make sure we're not aiming too low.
- Dan