[Bug 57936] New: Incorrect audio volume level read by app from the system - 100% all the time.

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=57936

Bug ID: 57936
           Summary: Incorrect audio volume level read by app from the
                    system - 100% all the time.
           Product: Wine
           Version: 10.2
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Hi guys.

I'm trying to use Yousician on Linux and it works amazingly well, maybe even
smoother than on W11, but there is one small problem: It's impossible to
preform latency calibration as the app is checking global system volume, if
it's too high, it disallows calibration to prevent hearing damage if the sounds
it produces are too loud.

On wine and wine-staging the volume in Yousician is always 100%. I use
pipewire-pulse backend and plasma-pa, I'm changing volume from plasma settings
or alsamixer, or pulsemixer but it stays 100% in Yousician.

Hope there's an easy fix for it :).

Regards,
W.

[Bug 57936] Incorrect audio volume level read by app from the system - 100% all the time.

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=57936

--- Comment #1 from Wiktor Grebla  ---
I tried to run Yousician with WINEDEBUG=+mmdevapi which showed me these:

02b4:trace:mmdevapi:AEV_GetMasterVolumeLevelScalar
(000000006D583FB0)->(000000006E4AEBA0)
02b4:fixme:mmdevapi:AEV_GetMasterVolumeLevelScalar stub

and this API I found in: wine/dlls/mmdevapi/audiovolume.c

static HRESULT WINAPI AEV_GetMasterVolumeLevelScalar(IAudioEndpointVolumeEx
*iface, float *level)
{
    TRACE("(%p)->(%p)\n", iface, level);
    if (!level)
        return E_POINTER;
    FIXME("stub\n");
    *level = 1.0;
    return S_OK;
}

So this stub is in fact returning 1.0 (100%).

Could this be modified to 0.8 upstream? :)

I don't want to re-compile wine on each update, alternatively I could hexedit
1.0f
to 0.8f, but I've problem finding correct dll, any hint?

Cheers,
W.