On Mon, 7 Dec 2020 15:57:33 +0100 Jakob Bohm <j...@wisemo.com> wrote:
> On 07/12/2020 15:13, Peter Maydell wrote: > > On Mon, 7 Dec 2020 at 13:56, kazusanosuke_kaz > > <kazusanosuke_...@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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