[Qemu-devel] [Bug 1486768] Re: BlackMagic USB3 video capture returns only blank frames in Windows (xHCI issue)

[Thomas Huth]

OK, thanks for your reply ... so I'm closing this ticket now

** Changed in: qemu
       Status: Incomplete => Won't Fix

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Title:
  BlackMagic USB3 video capture returns only blank frames in Windows
  (xHCI issue)

Status in QEMU:
  Won't Fix

Bug description:
  Hi,

  I've got an Intensity Shuttle USB3; it's a HDMI video capture card. It
  doesn't have any Linux drivers, so I'm trying to get it to work in a
  Windows 10 guest inside QEMU. I'm running latest git as of today
  (2015-08-20). I use this command line:

  sudo x86_64-softmmu/qemu-system-x86_64 -enable-kvm -smp 2 -m 4096
  -acpitable file=/sys/firmware/acpi/tables/MSDM -drive
  file=/home/sesse/windows.raw,if=virtio,format=raw -cpu host -netdev
  tap,id=hostnet0 -device virtio-net-pci,netdev=hostnet0,id=net0
  -monitor stdio -device nec-usb-xhci,id=xhci -device usb-
  host,bus=xhci.0,vendorid=0x1edb,productid=0xbd3b -usbdevice tablet

  (I will add that the seemingly logical “host:1edb:bd3b,bus=xhci.0” did
  _not_ add the device at all. I don't know why, probably some parser
  issue?)

  The card is properly detected, and the driver thinks everything is
  fine, running on the virtualized USB3 host and all. Looking at usbmon,
  there's lots of isochronous frames during capture, and they reach the
  host (looking at USBpcap on the Windows 10 side). However, the driver
  refuses to capture any video—all frames become black in all
  applications I try (well, Media Express seems to hardly store any
  frames at all in the .avi). However, audio is captured without a
  hitch. Curiously enough, no dropped frames are reported. There's no
  sign of CPU shortage; both host and guest seem to be happy around 20%
  of one core.

  I am fairly certain this is an issue with the xHCI driver in QEMU,
  because if I give it the entire USB controller via VT-d, it works
  flawlessly, with video and all. For reference, here's the associated
  command line I use for that (after I've unbound it from the Linux
  system):

  sudo x86_64-softmmu/qemu-system-x86_64 -enable-kvm -smp 2 -m 4096
  -acpitable file=/sys/firmware/acpi/tables/MSDM -drive
  file=/home/sesse/windows.raw,if=virtio,format=raw -cpu host -netdev
  tap,id=hostnet0 -device virtio-net-pci,netdev=hostnet0,id=net0
  -monitor stdio  -usbdevice tablet -device pci-assign,host=00:14.0

  I can get USB pcap logs from both sides if you want, but they are huge
  (gigabytes) since the data rate is so high.

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