On Tue, 17 Mar 2020 at 20:10, datenwolf <foo...@datenwolf.net> wrote:
> Hi,
>
> I'm currently struggling with the "new" (I guess it's been a few years,
> but so far I've never needed them) way to specify audio device emulation.
>
> The TL;DR of the task at hand I want to solve is: I want to make qemu
> use a snd-aloop device (let this be card 3) in a duplex configuration.
> In my case that would be card 3, device 0, subdevice 0, so in ALSA terms
> hw:3,0,0 – however this uses commas, which are already a separator for
> the suboptions of the -audiodev options.
>
> Even after reading the documentation for the 7th time or so, I still
> struggle to understand how some of the parameters fit together. When
> using the following command line
>
> qemu-system-x86_64 \
> -enable-kvm \
> -smp 2 \
> -m 2G \
> -usbdevice tablet \
> -audiodev alsa,id=alsa,in.dev=hw:3,out.dev=hw:3 \
> -soundhw hda \
> ...
>
> I'm told on stderr that
>
> > audio: Device hda: audiodev default parameter is deprecated,
> > please specify audiodev=alsa
>
> If I then try `-audiodev=alsa` this is taken as an invalid option.
>
> The slightly longer version of my problem statement is, that I'd like to
> connect qemu to a running JACK audio instance.
>
> Unfortunately when used with qemu that ALSA plugin fails to connect to
> the JACK server, using the following command line
>
> qemu-system-x86_64 \
> -enable-kvm \
> -smp 2 \
> -m 2G \
> -usbdevice tablet \
> -audiodev alsa,id=alsa,in.dev=jack,out.dev=jack \
> -soundhw hda \
> ...
>
> it fails with the following diagnostic output.
>
> > cannot connect system:capture_1 to alsa-jack.jackC.24006.70:in_000
> > alsa: Could not initialize ADC
> > alsa: Failed to apply audio parameters
> > alsa: Reason: Input/output error
> > alsa: Could not initialize ADC
> > alsa: Failed to set format 2
> > alsa: Reason: Invalid argument
>
> So this is somewhat a XY question: I want to connect it to JACK and
> think that I might be able to make this work though snd-aloop, but so
> far without success.
>
Hi,
Did you get any solution to this? I hit a similar thing as reportedly
use jack directly, if I spin a vm with an ich9-hda I see the following
output:
jack: JACK output configured for 48000Hz (1024 samples)
jack: JACK input configured for 48000Hz (1024 samples)
However, the vm doesn't produce any sound in the host, so
if I run, for instance the speaker test in a plasma desktop I hear
nothing. My audio bits from qemu:
-device ich9-intel-hda -device hda-duplex
The machine is a q35 one.
Thanks!
Jose.
