Full-motion zero-copy screen capture in Weston

[Marius Vlad]

On Fri, May 24, 2024 at 09:43:58PM +0000, Hoosier, Matt wrote:
> Hi,
> 
> I'm interested in finding or contributing some mechanism to get sort of the same effect as a cross between:
> 
> 
>   *
> weston_output_capture's support for using the DRM_MODE_CONNECTOR_WRITEBACK connectors, and
> 
>   *
> the streamed orientation of weston_screen_recorder, and
> 
>   *
> no forced reliance on the GPU to pre-blend the 2D scene – whatever plane blending would otherwise have occurred must still occur when the screen recording mechanism is active
> 
> The desktop environments' compositors implement the XDG screencast portal. If I read things correctly, that one deposits the stream of dmabuf frame fds into the Pipewire stream indicated by the user invoking the D-Bus Screencast API.
> 
> That doesn't really seem like a starter for doing this in Weston.
> There was conversation back in 2019 about trying to add zero-copy
> dmabuf support in Weston's own Pipewire integration, but I think that
> didn't happen?
https://gitlab.freedesktop.org/wayland/weston/-/merge_requests/1366
> 
> Alternately, I see that the remoting plugin on today's main branch supports GStreamer dmabuf allocators. Does this mean that I could build something using a virtual weston_output in the drm-backend?
> 
> Cheers,
> Matt
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