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

[wine-bugs at winehq.org]

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

            Bug ID: 41007
           Summary: Regression in minimum sound latency / HelBuflen value
           Product: Wine
           Version: 1.9.15
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: wine-bugs at winehq.org
          Reporter: lolisamurai at tfwno.gf
      Distribution: ---

In versions 1.9.10 and earlier, I was able to bring the massive sound latency
down to a decent 25ms by setting HelBuflen to 512 without any sound glitching
or stuttering.

I believe that somewhere between 1.9.10 and 1.9.11 there was a regression,
because starting from 1.9.11 I get massive sound glitching unless I up the
HelBuflen to around 8192, which adds like 50ms of sound latency.

This is most definitely a regression in minimum sound latency.

I am running linux gentoo 64-bits, the wine prefix is 32-bits and I'm using
pulseaudio. I'm specifically testing this with the game "osu!". I'm using the
built-in dsound and native .NET 4.5.

Steps to reproduce:

git clone git://source.winehq.org/git/wine.git
cd wine
mkdir build
cd build
../configure
make
WINEARCH=win32 WINEPREFIX=~/test winetricks -q dotnet45
# no, osu! doesn't run without native .NET 4.5 so you have to install it either
# through winetricks or manually
wget 'https://m1.ppy.sh/r/osu!install.exe' --no-check-certificate
WINEARCH=win32 WINEPREFIX=~/test regedit 
# set HKCU\Software\Wine\DirectSound\HelBuflen (string) to 512
WINEARCH=win32 WINEPREFIX=~/test ./wine 'osu!install.exe'

Wait for it to install and start up.
The game also seems to be occasionally freezing or crashing when this sound
glitching happens. I couldn't manage to get a log for this crash because it
seems to be stuck loading info, but I'm pretty sure you can reproduce it on
your end easily.
If I switch to native dsound, I just always get glitching even at 8192
HelBuflen.

If you perform these very steps on the stable version or 1.9.10, you will get
proper audio.

All I can notice in terminal output is this error spamming:
err:ole:CoInitializeEx Attempt to change threading model of this apartment from
multi-threaded to apartment threaded

Not sure if it's related to this problem or not.

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