Re: How to add cpp file to SDL

> How to resolve it?

You probably need to link against Microsoft's C++ runtime. SDL's Visual 
Studio project files don't link against _any_ C or C++ runtime at all 
(we implement our own malloc() using Win32 calls directly, etc). This is 
not my area of expertise, but it's probably just a simple change in the 
project files to fix this (but if you're planning on submitting this as 
a patch for SDL, we can't take in a C++ dependency).

Alternately: I presume DirectShow is a COM interface; you can call these 
from C with some magic macros. Here's an example of calling some 
IDirectSound methods, to see this sort of thing in action:

https://hg.libsdl.org/SDL/file/18f1e8b0737d/src/audio/directsound/SDL_directsound.c#l210

--ryan.