ID3D11VideoDevice::GetVideoDecoderProfileCount

DX11 vtable[11] → UINT

ID3D11VideoDevice::GetVideoDecoderProfileCount is a method of the COM interface ID3D11VideoDevice in Direct3D 11. Its function pointer sits at vtable index 11 — the zero-based slot in that interface's virtual method table, counted from QueryInterface and including every entry inherited from a base interface. It takes no parameters and returns UINT.

COM methods are reached through that table rather than by an exported name, so the slot index is what a wrapper, an interface hook or a disassembly listing has to resolve against.