[Bug 41007] Regression in minimum sound latency / HelBuflen value

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=41007

Ivan Molodetskikh <yalterz at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |yalterz at gmail.com

--- Comment #4 from Ivan Molodetskikh <yalterz at gmail.com> ---
Hello, I'd like to describe my experience with the added sound latency. I'm the
author of https://bugs.winehq.org/show_bug.cgi?id=40716

I'm using ALSA (no PulseAudio), with patched winealsa.drv for reduced latency.
The patch is simply changing three constants at the top of mmdevdrv.c
(DefaultPeriod, MinimumPeriod, EXTRA_SAFE_RT) to lower values (the ones that
work for me: 22000, 22000, 11000 respectively).

On wine 1.9.9 and earlier where everything works fine, this results in an
extremely low (almost none) audio latency, which is good. Reducing
DefaultPeriod and MinimumPeriod lower makes the sound crackle a lot. Reducing
EXTRA_SAFE_RT doesn't seem to change anything.

On wine 1.9.10 and above the "minimal" values of the constants seem to be
around 10000 and 10000 for me, below that there's no sound at all (there's no
crackling stage). The audio latency is much higher (both on "good" values from
wine 1.9.9 and on the new minimal values).

I tested it on wine 1.9.17 where the commit was reverted, and while the bug I
reported did get fixed (by the way it was introduced in wine 1.9.11 while the
high audio latency one - in 1.9.10), the high audio latency didn't.

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