[edk2-devel] VirtIO sound device in qemu?

[Rafael Machado]

That remembers me why did I do my mastering thesys using a real hardware :)

Rafael

Em ter, 8 de jun de 2021 17:25, Leif Lindholm <leif at nuviainc.com> escreveu:

> Hi Ethin,
>
> Adapting and overcoming is very much the point of GSoC.
> The purpose of this project was always to bring portable audio support
> to EDK2, and longer-term the UEFI specification. Virtio was just the
> ideal means to that end.
>
> If it turns out not being the ideal way, that's just the way it is.
> *But*, I want to point out that there is no reason why we couldn't
> build this on top of a not-yet-upstream QEMU patchset - and help out
> by providing an eager real consumer for it.
> The virtio-snd RFC has been sent out, and it is very unlikely that it
> will not end up being merged, if in a modified form from what the
> first proof-of-concept looked like. Working with it would give you the
> opportunity to influence that implementation, as well as the
> virtio-snd standard.
>
> *However*, if the state of the QEMU virtio-snd RFC is not one that
> lends itself to basing other work on, then QEMU's usb-audio support is
> a close second - that should also be portable to other
> If we pick that route, you can always come back to virtio a bit later
> if you make good progress on USB Audio Device Class 1.0.
>
> /
>     Leif
>
> On Tue, Jun 08, 2021 at 13:52:14 -0500, Ethin Probst wrote:
> > 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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