[Bug 46450] New: Volume Control doesn't work in Firefox videos ( and browsers based on it) with PulseAudio driver

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=46450

            Bug ID: 46450
           Summary: Volume Control doesn't work in Firefox videos (and
                    browsers based on it) with PulseAudio driver
           Product: Wine
           Version: 4.0-rc5
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: winepulse.drv
          Assignee: wine-bugs at winehq.org
          Reporter: gabrielopcode at gmail.com
                CC: aeikum at codeweavers.com
      Distribution: ---

The volume control on videos does not work and has no effect. Tested on Firefox
52 ESR, Waterfox and latest Pale Moon (you have to enable media.wmf.vp9.enabled
to true for the latter so you can play videos on Youtube without native mfplat
/ vdec DLLs).

I skimmed through Firefox's source code, it appears to be using
IAudioStreamVolume::SetAllVolumes or similar calls. When I poked through Wine's
code, it seems only coreaudio driver actually does anything here.

The pulseaudio driver's SetAllVolumes is basically a no-op because it doesn't
do anything with the volume it sets (except retrieve it with GetAllVolumes),
and it's never sent to libpulse so of course it doesn't have any effect. The
coreaudio driver does call ca_setvol or ca_session_setvol where the pulse
driver is missing such a thing completely.

With a quick search I found that pa_context_set_sink_input_volume might be
useful for this purpose, but I don't really know much about libpulse, perhaps
there's a better way. It definitely can't stay like this though, since right
now it's basically a stub without even a FIXME for it...

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