GStreamer Video Sink for WinUI3

This project contains a new GStreamer video sink element and examples to show a basic usage.

1. Requirements

1.1 gst-build

• Setup gst-build as documented, see also Windows Prerequisites Setup

• Apply 3 patches to GStreamer source code

  • gstreamer: https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/787
  • gst-plugins-bad: https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/2153 and local patch

• Installation prefix should be specified, for example

PS > meson _builddir --prefix=C:/WHERE/TO/INSTALL
... meson will configure gst-build project...
PS > ninja -C _builddir install

1.2 Visual Studio 2019

• Visual Studio 2019 16.9.3 or newer is required so that can use WinUI3 development package

• Modify GST_INSTALL_PATH user macro in GStreamer.props with your prefix path via Visual Studio -> Property Manager or manually.

2. GstWinUI3VideoSink

This element is very similar to upstream d3d11videosink element but WinUI3 SwapChainPanel specific implementation. The usage is not much different from other elements.

2.1 Element create

User can create the element via gst_element_factory_make()

GstElement* mySink =
  gst_element_factory_make (`winui3videosink`, nullptr);

and gst_parse_launch() will work as well.

2.2 SwapChainPanel Setup

winui3videosink element doesn't support GstVideoOverlay interface. So, gst_video_overlay_set_window_handle() method must not be used in this case. Instead, user need to use gst_win_ui3_video_sink_set_panel() method. See also header file