Capture hardware accelerated fullscreen applications

[marco-vogt]

Capture hardware accelerated fullscreen applications

[krayon007]

Not sure about windows, but in Linux TeamViewer installs a custom video driver to intercept the video buffer, which is something we explicitly are trying to avoid having to do.

A colleague of mine write some code to do remote screen capture on Linux that didn't require X but I found that required specific graphics hardware and was incompatible with how graphics was virtualized on VMs. This sounds similar to what you are talking about, as his code had to intercept the buffer in the same way after the OS wrote to the graphics hardware.

It could be worth investigating again, but I'm not sure this is possible without relying on a custom driver to fetch the buffer after the GPU pipeline.

[jsastriawan]

I have tried to write framebuffer scrapper using libdrm for Linux and it works well on driver that support framebuffer readback (i915) but not on vmware svga.

https://github.com/jsastriawan/MeshAgent

I have not look at it for quite sometime. Feel free to continue working on it.

Regards,

Joko

[marco-vogt]

I have no idea how it works under linux...i just described the windows way of achieving this.

I think it would be rather straight forward on windows. Once one graphics api is successfully implemented, the others should be no problem. but its not a thing to make in a couple of days, sure.

But anyway, I just wanted to know if this is something you guys are planning to implement but as you said you want to avoid doing this, its fine.

If youre curious how this is done in windows, this should give you an idea. https://github.com/bakwc/LibQtScreen

[marco-vogt]

If youre still interested, i just found out about the Windows Desktop Duplication API. Its pretty easy to implement but it only supports windows 8 and higher.