[vfio-users] PCIe Sound Card VFIO Pass through Sounds Terrible (link to audio file)

[Rokas Kupstys]

You have it working? I tried (although through alsa) but sound was very
poor quality.

Rokas Kupstys

On 2016.09.30 16:19, sL1pKn07 SpinFlo wrote:
> why not use the sound card through pulseaudio?
>
> (damn you , ML/gmail)
>
> 2016-09-30 13:00 GMT+02:00 Jonathan Scruggs <j.scruggs at gmail.com>:
>> Hi all,
>>
>> I have a PCIe sound card that I wish to pass through to a Windows 10 guest
>> using VFIO, but it sounds terrible.
>>
>> Kernel: Linux Beast 4.7.5-gentoo #5 SMP PREEMPT Thu Sep 29 11:26:39 BST 2016
>> x86_64 Intel(R) Core(TM) i7-5930K CPU @ 3.50GHz GenuineIntel GNU/Linux
>>
>> Qemu version: app-emulation/qemu-2.7.0-r4::gentoo
>>
>> Libvirt version: app-emulation/libvirt-2.2.0
>>
>> The sound card is:
>> 09:00.0 Audio device: Creative Labs Sound Core3D [Sound Blaster Recon3D /
>> Z-Series] (rev 01)
>>
>> The relevant part of the XML file is:
>>     <hostdev mode='subsystem' type='pci' managed='yes'>
>>       <driver name='vfio'/>
>>       <source>
>>         <address domain='0x0000' bus='0x09' slot='0x00' function='0x0'/>
>>       </source>
>>       <address type='pci' domain='0x0000' bus='0x00' slot='0x0a'
>> function='0x0'/>
>>     </hostdev>
>>
>> The Audio I'm trying to play: https://www.youtube.com/watch?v=jc8Mm5TtIhg
>>
>> What it actually sounds like:
>> https://drive.google.com/file/d/0B12vXeyT8c8HZ0RqMmpnWDZUdXM/view?usp=sharing
>>
>> To record the Audio, I plugged the cable into a recorder instead of going
>> through speakers or line in on the host to see if it was any other device,
>> but it sounds the same on all.
>>
>> I hope you can help.
>> Jon
>>
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>>
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