[Bug 237472] emulators/virtualbox-ose: no sound

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237472

            Bug ID: 237472
           Summary: emulators/virtualbox-ose: no sound
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: vbox at FreeBSD.org
          Reporter: d8zNeCFG at aon.at
             Flags: maintainer-feedback?(vbox at FreeBSD.org)
          Assignee: vbox at FreeBSD.org

Created attachment 203898
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=203898&action=edit
port option changes to enable PULSEAUDIO

I have not had working sound in VirtualBox for a long time.

Scenario:
- Host OS: FreeBSD 12.0-RELEASE-p3 #6 r343805M
- Host HW: Core i7 2630QM, Conexant CX20590
- x11/kde5 installed, all ports latest
- Various client machines (Win 10, FreeBSD 12 & 13, openSUSE, Debian,
CentOS,...)
- Today I recompiled all ports with PULSEAUDIO enabled (where it was off
before), to be exact the following: kde5-5.15.4.19.04.0 virtualbox-ose-5.2.26_4
alsa-plugins-1.1.1_4 kmix-19.04.0 openal-soft-1.19.1_2 ffmpeg-4.1.3_2,1
mplayer-1.3.0.20190329_1 mpv-0.29.1_6,1 phonon-qt5-4.10.2_3
qt5-multimedia-5.12.2 QtAV-1.12.0_7 speech-dispatcher-0.8.8 espeak-1.48.04_6
libao-1.2.0_4 sdl-1.2.15_13,2 sdl2-2.0.9_2 vlc-3.0.6_12,4 freerdp-2.0.0.r4_2
plasma5-plasma-desktop-5.15.4_1 plasma5-plasma-5.15.4 qt5-webengine-5.12.2
(precise list of changes attached)
- VirtualBox now supports Pulseaudio, Alsa, and OSS

Result:
- Sound in the VM basically never works
- Tried with OSS, Alsa, and Pulseaudio backends
- Today, and only once, sound worked haltingly in openSUSE Leap 15.0 when using
Pulseaudio (now it does not anymore)

Note:
- Sound from native applications works without problem
- A few years ago, sound did work. I believe the last VirtualBox version where
it was working was something like 4.0.8.

Just curious:
- Since enabling PULSEAUDIO (see above) I now have two audio volume mixers in
my panel. Can anybody explain what is going on?
- Does anybody have sound working in VirtualBox clients? If yes, what magic are
you using?

-- Martin

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