[edk2-devel] VirtIO sound device in qemu?

[Ethin Probst]

So I just might have to go with USB audio (the basic audio device
class) since no code in QEMU for VirtIO audio has actually been
committed upstream. Perusing the qemu code (specifically this:
https://github.com/qemu/qemu/blob/master/hw/usb/dev-audio.c) it
appears that Qemu implements v. 1.0 of the ADC specification. Section
5.3.3.1.2 of the USB basic audio device specification (v. 1.0)
confirms that the bcdADC field should be set to 0100h. Will doing this
violate any rules of GSoC or anything like that?
I can implement VirtIO, but I will have no way of testing it until
Qemu actually adds it in (unless there's another emulator that
implements it). :-(

On 6/7/21, Leif Lindholm <leif at nuviainc.com> wrote:
> On Mon, Jun 07, 2021 at 17:16:00 +0200, Laszlo Ersek wrote:
>> On 06/07/21 13:40, Michael Brown wrote:
>> > On 07/06/2021 05:41, Ethin Probst wrote:
>> >> For my audio output protocol (I wonder if we should abbreviate it as
>> >> AOP?) I need to get access to VirtIO devices in PCIe configuration
>> >> space. However, I can't seem to find a way of telling QEMU to use this
>> >> device for audio output. Is there something I missed, or something
>> >> that does support this?
>> >
>> > Do you mean that you can't find a way to get QEMU to create a Virtio
>> > audio device visible to the guest, or that you can't find a way to get
>> > QEMU to connect this Virtio device to the host-side audio output?
>>
>> My latest (admittedly, quite old) information has been that QEMU does
>> not implement a virtio-audio device yet. It's been work in progress.
>> Best inquire on qemu-devel, CC'ing the audio subsys maintainers.
>
> An RFC sent out end of April has not yet seen a PATCH, but some
> feedback:
> https://lists.gnu.org/archive/html/qemu-devel/2021-04/msg06089.html
>
> /
>     Leif
>


-- 
Signed,
Ethin D. Probst


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