Add a new action signal to allow applications to capture
the most recently rendered frame directly from the swapchain
back buffer.
Unlike the existing "last-sample" property, which exposes
the raw input sample before any sink-side processing, this
signal captures the final displayed image after any internal
image processing (e.g., UV remap, color balance, overlay) has been
applied.
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/9423>
Adding a new videosink element for Windows composition API based
applications. Unlike d3d12videosink, this element will create only
DXGI swapchain by using IDXGIFactory2::CreateSwapChainForComposition()
without actual window handle, so that video scene can be composed
via Windows native composition API, such as DirectComposition.
Note that this videosink does not support GstVideoOverlay interface
because of the design.
The swapchain created by this element can be used with
* DirectComposition's IDCompositionVisual in Win32 app
* WinRT and WinUI3's UI.Composition in Win32/UWP app
* UWP and WinUI3 XAML's SwapChainPanel
See also examples in this commit which show usage of the videosink
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/7287>
