[vbox-dev] audio issues

Andreas Löffler andreas.loeffler at oracle.com
Wed May 24 17:53:19 UTC 2017

Hello Perry/all,

just wanted to let you know that there's a new 5.1 test build [1] 
r115730 which should have audio improvements regarding HDA emulation in 
combination with Windows 10 AU (Anniversary Update) + CU (Creators 
Update) guests.

Happy testing,

[1] https://www.virtualbox.org/wiki/Testbuilds

Kind regards / Mit freundlichen Grüßen

Andreas Löffler             | VirtualBox Engineering
Principal Software Engineer | Oracle Virtualization

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On 27.04.2017 14:16, Perry Halbert wrote:
> Good day Frank,
> I too was surprised that there was an improvement. I look at the changes
> and didn't really see any audio areas specifically worked on so I
> calculated that the timing or buffers had been changed in some way on
> the host side code.  To tell you the truth it always looked like a
> buffer issue to me. Anyway it had improved for me for several days and
> not anything that I have done, but today it is back to the same old ways
> of the stuttering and audio out of sync with the video plus the whole
> video skips ahead a second so even the video is jumpy.
> I will continue to monitor this and let you know what I find, maybe not
> right away this time.
> Best regards,
> Perry
> On 04/27/2017 02:30 AM, Frank Mehnert wrote:
>> Hi Perry,
>> On Freitag, 21. April 2017 11:02:33 CEST Perry Halbert wrote:
>>> As of today r66644 from SVN, audio is much improved but not fixed yet.
>>> The stutter is improved but now there are popping issues.  The
>>> additional logging shows a greatly reduced amount of the stuttering due
>>> to stream full but they still happen.
>>> Host Linux 64-bit guest Mint-17 64-bit and tried both ac97 and intel hd
>>> audio. I sounds like the intel hd audio might be better than the ac97 to
>>> my ears but can not provide empirical data to support the assumption.
>>> I don't do a lot with Windows these days but it appears that the audio
>>> in a Win-7 guest has been acceptable all along if that is of interest to
>>> you.
>> thank you for testing. Some status update regarding sound in trunk and in the
>> 5.1.x branch:
>> At the moment the code between trunk and 5.1 drifts away a little bit. In
>> principle trunk has the more modern audio framework, in particular it moves
>> more audio work from the EM threads (the VCPU emulation threads) to separate
>> threads. This is good for the timing and therefore good for audio quality.
>> Trunk audio didn't change for some weeks (it still needs improvements),
>> therefore we are slightly surprised that you experience improvements with
>> the latest trunk updates. I'm also not aware of any recent VMM updates which
>> would improve timing...
>> The 5.1.x branch still uses quite old audio code. We don't want to do
>> fundamental changes in 5.1.x but we need to fix certain cases. Especially
>> we are aware that Windows 10 AU guests don't work well with 5.1.x (including
>> 5.1.20). Unfortunately fixing this is more complicated and conflicts with
>> our goal to keep the changes in 5.1.x minimal. I can only say that we are
>> trying to improve the situation with Windows 10 AU+ guests but we still don't
>> have a final solution.
>> Kind regards,
>> Frank
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