How to intercept the signal from the video card?

Question

Programming

Hello, I would like to know if it is possible to intercept the signal from the video card? And in general, in which direction is it better to dig? As I understand it refers to WinAPI? Or through DirectX?

Answer 1

Well, what signal do we want to intercept? Screen? There are frame grabbers for this . Or you can connect a composite and assemble an analog with a separate board. Yes, and even if digital HDMI transmits a figure, physics still remains - we relieve tension and it's done, unless you have to do it very quickly, and even correct errors. You can hook directx or opengl from the software , but most likely there will be no shaders - pipeline costs, or create a virtual monitor , but there are difficulties with hardware acceleration. There are more specialized methods, such as keeping track of a piece of memory or communicating with the video card through one of the many APIs .. But these methods are very platform dependent.

Answer 2

Of the free standards, it is worth noting OpenMAX.
One of its implementations for Windows is LIM OpenMAX