On Wed, 31 Jul 2019 10:20:22 +1200 Barry Song <21cn...@gmail.com> wrote:
> as said in the other email, independent clone mode has been resolved > by hacking weston damage tracking system. > i am looking for a solution to support remote screen mirroring. the > current idea is making the pipewire display work as a duplicated > display which shows the same content with the physical display. > this will probably resolve the screen mirror issue. would you like to > think it is the right direction? Hi, yes, that can work, and it is nicely orthogonal in implementation to the real outputs. It will have the same problem as the remoting plugin already worked around with the concept of DRM virtual outputs. Libweston currently supports only one backend at a time, but we would really need to able to have multiple input and output backends in use at the same time to improve the internal architecture and make remoting independent of the actual backends. An alternative approach would be to hook up to a real existing output and copy frames from it when the remote video pipeline is ready to consume them. That could also side-step the issue of the video encoder wanting to keep a hold of too many old frames for reference, that would otherwise cause gbm_surface to run out of buffers. The screen-share plugin does the copying already through glReadPixels from an existing output. That would be fine for a software video encoder, but sub-optimal for a hardware video encoder. FWIW, I wrote down some ramblings here: https://gitlab.freedesktop.org/wayland/weston/issues/268 Thanks, pq
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