[Bug 42856] New: osu! - high sound latency with winepulse compared to winealsa

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=42856

            Bug ID: 42856
           Summary: osu! - high sound latency with winepulse compared to
                    winealsa
           Product: Wine
           Version: 2.6
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: directx-dsound
          Assignee: wine-bugs at winehq.org
          Reporter: yalterz at gmail.com
      Distribution: ---

I'm trying to set up PulseAudio to achieve the same low audio latency as I'm
getting with just ALSA. Looks like I managed to achieve this, but not as I
would expect.

Currently my setup is: PulseAudio with default configuration, along with
pulseaudio-alsa integration which basically forwards all ALSA-using programs
straight to Pulse. I am using patched winealsa.drv for reduced latency
(changing three constants at the top of mmdevdrv.c — DefaultPeriod,
MinimumPeriod, EXTRA_SAFE_RT — to lower values, the ones that work for me:
20000, 20000, 11000 respectively). I applied a very similar patch to
winepulse.drv.

When running osu! through ALSA (sound=alsa), which effectively runs it through
ALSA->PulseAudio->ALSA device, the audio latency is almost non-existant —
similar if not the same as what I was getting with just ALSA.

When running osu! through PulseAudio (sound=pulse), effectively
PulseAudio->ALSA device, the audio latency is noticeably higher (at least 20ms
higher), even though it practically removes one extra step from the audio
"chain".

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