[Bug 41329] New: Regression in dsound latency (pulse)

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=41329

            Bug ID: 41329
           Summary: Regression in dsound latency (pulse)
           Product: Wine
           Version: 1.9.18
          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: ---

As for my other bug report, this report is specific to the game osu! which can
be installed with the same steps as the older bug report
(https://bugs.winehq.org/show_bug.cgi?id=41007).

Somewhere around wine 1.9.10 there was a regression in sound latency of about
20 milliseconds, using the same HelBuflen valueof 1024. This is still present
in 1.9.18. I'm using pulseaudio, a 32-bit wine prefix and the game uses dsound
for sound output.

However, it's very hard to notice latency for someone who isn't used to playing
the game, so you'll probably have to take my word for it.

After git bisecting, I got these three patches that can't be tested due to
crashes and sound glitching (probably because they're related to eachother and
can't be tested individually)

There are only 'skip'ped commits left to test.
The first bad commit could be any of:
569ed159b0ab31121d9aab95bf1d3ac49675f1ca
95287ac2dfb3bd64e1b65aadbdf7e375af2607d4
09890d7142a2c612b025ab9ff60358d036f9999b
We cannot bisect more!

I don't know enough about the dsound internals and it doesn't seem to be as
simple as reverting the patches since dsound/primary.c changed a lot since
then.

I have attached logs with WINEDEBUG=+dsound of playing for a few seconds on the
latest wine version (with_latency) vs commit
77184106c8c2bff7db9ea5d20b3b3330196befc1 , which should be the last one that
doesn't have latency (without_latency).

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