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[Bug 1499908] Re: hda sound capture broken with VNC
From: |
Thomas Huth |
Subject: |
[Bug 1499908] Re: hda sound capture broken with VNC |
Date: |
Sat, 01 May 2021 08:06:45 -0000 |
This is an automated cleanup. This bug report has been moved
to QEMU's new bug tracker on gitlab.com and thus gets marked
as 'expired' now. Please continue with the discussion here:
https://gitlab.com/qemu-project/qemu/-/issues/70
** Changed in: qemu
Status: Incomplete => Expired
** Bug watch added: gitlab.com/qemu-project/qemu/-/issues #70
https://gitlab.com/qemu-project/qemu/-/issues/70
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https://bugs.launchpad.net/bugs/1499908
Title:
hda sound capture broken with VNC
Status in QEMU:
Expired
Bug description:
QEmu is being used to run the Wine conformance tests in Windows
virtual machines. Wine's conformance tests check the behavior of
various Windows APIs and verify that they behave as expected. One of
the tests checks the behavior of the mmdevapi sound capture APIs. This
test works fine on real hardware and also works fine in various QEmu
VMs but fails in some others. Further investigation showed that:
* The mmdevapi:capture tests work on the two Vista VMs. Those use the
ac97 sound card and are configured for VNC access to the VM.
* The mmdevapi:capture tests fail in the Windows 7+ VMs. Those use an
hda sound card and are configured for VNC access to the VM (so
'-device intel-hda,id=sound0,bus=pci.0,addr=0x4 -device hda-
duplex,id=sound0-codec0,bus=sound0.0,cad=0' and '-vnc 127.0.0.1:0').
* Furthermore configuring the VM for Spice access fixes the
mmdevapi:capture test (so replacing -vnc with '-spice
port=5900,addr=127.0.0.1,disable-ticketing,seamless-migration=on'),
this even if no client connects to the VM.
So in effect the -spice and -vnc options change the behavior of the
sound device.
To reproduce this bug:
1. Set up a Windows 7+ VM with an hda sound card ('ich6' in libvirt).
2. Set it up for access using VNC.
3. Copy the attached mmdevapi_test.exe file to it. (*)
4. Run the tests as follows:
mmdevapi_test.exe capture
If you see these 'Test Failed' lines then the bug is still present:
capture.c:586: Returned latency: 5.8050 ms
capture.c:178: Test failed: Position 1015 expected 0
capture.c:186: Wait'ed position 1015 pad 0 flags 1, amount of frames locked:
448
capture.c:228: Test failed: Position 2167 expected 1463
capture.c:248: Sleep.1 position 2167 pad 4032 flags 1, amount of frames
locked: 448
capture.c:256: Test failed: Position 2167 expected 1463
capture.c:292: GetBufferSize 21996 period size 448
capture.c:302: Overrun position 4215 pad 8960 flags 1, amount of frames
locked: 448
capture.c:308: Test failed: GCP 8960 vs. BufferSize 21996
capture.c:313: Test failed: Position 4215 gap 2304
capture.c:329: Cont'ed position 5303 pad 8512 flags 1, amount of frames
locked: 448
capture.c:333: Test failed: Position 5303 expected 4663
capture.c:334: Test failed: flags 1
capture.c:353: Restart position 7351 pad 8064 flags 1, amount of frames
locked: 448
capture.c:358: Test failed: Position 7351 expected 5111
capture.c:359: Test failed: flags 1
In case it helps, here is the source of mmdevapi_test.exe:
https://source.winehq.org/git/wine.git/?a=blob;f=dlls/mmdevapi/tests/capture.c;hb=60d1d6f5952e8b5d6fb0327a28c047058851fa70#l178
So far I have confirmed that this bug is present in QEmu as shipped in the
following Debian packages:
* qemu-kvm + qemu-system-x86 1:2.1+dfsg-12+deb8u2 +
linux-image-3.16.0-4-amd64 3.16.7-ckt11-1+deb8u3
* qemu-system-x86 1:2.3+dfsg-6a + linux-image-4.1.0-1-amd64 4.1.3-1
(*) As alternatives to using the attached binary you can:
- Compile it from Wine's source. See:
https://source.winehq.org/git/wine.git/
- Or download the latest WineTest binary from
https://test.winehq.org/builds/winetest-latest.exe
And extract the mmdevapi_test.exe from there:
winetest.exe -x tests
tests\mmdevapi_test.exe capture
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