[pve-devel] Audio support, dummy/none

[Gilles Pietri]

Le 03/01/2021 à 01:55, Gilles Pietri a écrit :
> Hi!
> 
> Happy new year to everyone, especially the devs working on Proxmox, it's
> still awesome in 2021 ;)
> 
> I'm interested in replicating a qemu audio setup that uses the dummy
> driver (called "none") on Proxmox, but the enum $audio_fmt
> (PVE/QemuServer.pm) for drivers only contains spice as a choice, which
> is all nice, but a bit restrictive!
> 
> Since this is used only (?) to generate the audio conf (through
> conf_has_audio), which generate the audio devices through audio_devs,
> which in turn generates both the -device param and the -audiodev
> backend,id=xxx, it seems there wouldn't be any side effect if we fed
> "none" instead of spice, as the id param is valid and works the same here.
> 
> I haven't tried patching that, but it might be that this would boil down to:
> 
> diff --git a/PVE/QemuServer.pm b/PVE/QemuServer.pm
> index bca5669..54278e5 100644
> --- a/PVE/QemuServer.pm
> +++ b/PVE/QemuServer.pm
> @@ -211,7 +211,7 @@ my $audio_fmt = {
>      },
>      driver =>  {
>         type => 'string',
> -       enum => ['spice'],
> +       enum => ['spice', 'none'],
>         default => 'spice',
>         optional => 1,
>         description => "Driver backend for the audio device."
> 

I tried it, it went on generating the kvm command line with none instead
of spice as:
-device 'ich9-intel-hda,id=audiodev0,bus=pci.2,addr=0xc' -device
'hda-micro,id=audiodev0-codec0,bus=audiodev0.0,cad=0,audiodev=none-backend0'
-device
'hda-duplex,id=audiodev0-codec1,bus=audiodev0.0,cad=1,audiodev=none-backend0'
-audiodev 'none,id=none-backend0'

instead of the original:
-device 'ich9-intel-hda,id=audiodev0,bus=pci.2,addr=0xc' -device
'hda-micro,id=audiodev0-codec0,bus=audiodev0.0,cad=0,audiodev=spice-backend0'
-device
'hda-duplex,id=audiodev0-codec1,bus=audiodev0.0,cad=1,audiodev=spice-backend0'
-audiodev 'spice,id=spice-backend0'

And this works flawlessly…

However, I guess I need to deploy the full version to have the webui
integrating it, but I can follow up on that…

Regards,
Gilles