Re: Sound error: Could not initialize DirectSoundCapture

[Lukas Straub]

On Mon, 7 Dec 2020 15:57:33 +0100
Jakob Bohm <jb@wisemo.com> wrote:

> On 07/12/2020 15:13, Peter Maydell wrote:
> > On Mon, 7 Dec 2020 at 13:56, kazusanosuke_kaz
> > <kazusanosuke_kaz@yahoo.co.jp> wrote:  
> >> Hi, all!
> >>
> >> I've just installed qemu to my PC, Windows 8.1(x64) with Core i5-4670 / 
> >> MSI MS-7817(OnBoard Sound) / GeForce GT 640
> >> Windows 98SE was successfully installed on qemu, but sound device doesn't 
> >> work ...
> >>
> >> "C:\Program Files\qemu\qemu-system-i386.exe" -device sb16 -m 512 
> >> Windows98SE.qcow2
> >> dsound: Could not initialize DirectSoundCapture
> >> dsound: Reason: No sound driver is available for use, or the given GUID is 
> >> not a valid DirectSound device ID  
> > (I don't use Windows, but here are some suggestions based on
> > reading the source code.)
> >  
> >> Even though I choose another soundhw, the result is all the same  
> > That's because this error message is not related to what sound
> > hardware is being given to the guest. It's the QEMU DirectSound
> > audio backend complaining that when it asked the host Windows
> > for a sound-input device (ie a microphone or similar) it got
> > an error back. (Specifically, the IDirectSoundCapture_Initialize()
> > call failed.) So the warnings are basically saying "sound input
> > to QEMU is not going to work", and they'll be printed for any
> > kind of sound hardware you give to the guest (sb16, ac97, ...).
> >
> > That said, looking at the code I think that the DirectSound
> > backend attempts to continue even if audio input doesn't work.
> > So if you only care about audio output, in theory these warnings
> > should be harmless.
> >
> > You could try some of the suggestions in this stack overflow
> > post:
> > https://stackoverflow.com/questions/55601413/how-to-fix-could-not-initialize-directsoundcapture-in-android-studio
> > (effectively "plug in a microphone" or "enable some windows-internal
> > input device") to see if they help. If that makes the warnings
> > go away and also makes sound output start working, then there
> > might be a bug in the QEMU code that is supposed to handle
> > "input doesn't work but proceed with output anyway". If the
> > warnings go away but sound output still doesn't work, then
> > the output problem is not related to the warnings.  
> I sometimes use Windows, and the only time I tried a qemu on Windows,
> I could not find any working sound option, and all the help and error
> messages were useless, suggesting things that weren't explained, listing
> options that didn't work etc.
> 
> Someone on the team needs to clean up sound support in the prebuilt
> Windows binaries that are linked to from qemu.org.
> 
> 

CC'ing Stefan Weil, maintainer for windows hosts.


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