SpectatorView.Native Dlls

The following Dlls are built out of the SpectatorView.Native.sln.

  • SpectatorView.Compositor.dll is needed for DSLR camera calibration and DSLR camera spectating experiences.
  • SpectatorView.Compositor.UnityPlugin.dll is needed for DSLR camera calibartion and DSLR camera spectating experiences.
  • SpectatorView.OpenCV.dll is used in both ArUco marker detection and DSLR camera calibration.
  • SpectatorView.WinRTExtensions.dll is used for ArUco marker detection and QR code detection.

Building DLLs

The instructions below show how to build all of the native DLLs required by SpectatorView.

1. Obtain external dependencies

DeckLink Capture Card If you are using a Blackmagic design capture card, you will need to install the SDK and create a Visual Studio user macro for its location.

  • Download Blackmagic design's Desktop Video & Desktop Video SDK from here. Search for Desktop Video & Desktop Video SDK in "Latest Downloads" (Note: 10.9.11 is the current version used in the SpectatorView.Compositor.dll. Newer versions may contain breaks.)

    Note: Desktop Video SDK 10.9.11 does not have a MIT license. License information is provided when downloading the sdk.

  • Extract the SDK anywhere on your computer.

  • Update the DeckLink_inc user macro in dependencies.props with the corresponding path on your computer.

  • Restart Visual Studio

Elgato Capture Card If you are using an Elgato capture card, you will need to clone Elgato's gamecapture github repo.

  • Open a Command Prompt in administrator mode
  • Navigate to a folder in which you would like to store your repositories (ex: c:\git)
  • git clone https://github.com/elgatosf/gamecapture
  • Update the Elgato_Filter user macro in dependencies.props with the corresponding path on your computer.
  • Restart Visual Studio

OpenCV

Note: SpectatorView.OpenCV.dll introduces dependencies on OpenCV. OpenCV does not have a MIT license. For more information on OpenCV's license, see here.

  • Video camera calibration requires a Release x64 version of this binary built from the SpectatorView.OpenCV.Desktop visual studio project.
  • ArUco Marker detection on a HoloLens 1 device requires a Release x86 version of this binary built from the SpectatorView.OpenCV.UWP.
1. Install Vcpkg
  • Open a Command Prompt in administrator mode
  • Navigate to a folder in which you would like to store your repositories (ex: c:\git)
  • git clone https://github.com/Microsoft/vcpkg
  • cd vcpkg
  • .\bootstrap-vcpkg.bat
  • .\vcpkg integrate install
2. Install OpenCV Contrib

For ArUco marker detection, you will need to install a x86 uwp friendly version of opencv. For DSLR camera calibration, you will need to install a x64 desktop friendly version of opencv.

  • .\vcpkg install protobuf:x86-windows
  • .\vcpkg install opencv[contrib]:x86-uwp --recurse
  • .\vcpkg install opencv[contrib]:x64-windows --recurse

NOTE: Copy the above lines exactly (the []s do not indicate an optional value).

2. Build the plugins

Building the SpectatorView.Native solution for each architecture will produce the correct required binaries for each platform. Note that not all binaries will build on every architecture.

  • Open src/SpectatorView.Native/SpectatorView.Native.sln in Visual Studio.
  • Build a Release x64 version of the solution.
  • Build a Release x86 version of the solution.
  • Build a Release ARM version of the solution.

3. Troubleshooting build issues

Installing OpenCV Contrib for UWP failed

When encountering issues with vcpkg, the most up to date information will be found in the vcpkg project. Searching for specific errors in the vcpkg issues list will be the quickest way to find potential workarounds.

NOTE: When trying other vcpkg commits, you may end up with a different version of opencv getting installed to your development machine. This may require fixing code breaks for the SpectatorView.OpenCV.dll. If you are unable to resolve these issues yourself, please file an issue for the MixedReality-SpectatorView repository.

OpenCV header/dll is not found

If installing opencv with vcpkg succeeded, a few things could still occur that prevent SpectatorViewPlugin's from referencing the opencv libs/dlls correctly. Try the following:

  • Restart Visual Studio. If SpectatorViewPlugin.sln was opened in visual studio prior to installing the opencv for uwp components, visual studio may not have correctly resolved needed environment variables. Closing and reopening visual studio should result in these environment variable paths resolving correctly.
  • Vcpkg will periodically update the version of OpenCV that it builds. This may require updates to the OpenCV associated code in the Spectator View codebase. The last verified version of OpenCV is 4.1.1. You can determine what version of OpenCV that you have obtained locally by running dir /s opencv_*.dll in your clone of the vcpkg repository. Dlls will have a trailing version number (for example opencv_aruco411.dll). If you encounter errors when trying to use newer versions of OpenCV, please file an issue against the MixedReality-SpectatorView repo. If you are using an older version of OpenCV, you may need to update your vcpkg repo to the most recent commit in its master branch and rerun the vcpkg install commands described above.

4. Adding compiled binaries to SpectatorView.Unity

After compiling the above binaries, run tools/Scripts/CopyPluginsToUnity.bat to add said binaries to the SpectatorView.Unity project. This script will also add .meta files for the binaries to the Unity project.

Note: The Unity editor does not currently dynamically unload binaries. Errors may occur when trying to copy binaries into your Unity project if the unity editor has loaded said binaries. If errors are encountered with this script, close your Unity editor and try again.