Actually, from a site. It plays Flash Videos and I want to create a C API. I must analyze the site structure and somehow get the Flash Download (well, I didn't find any standard API). What should I do to do it easier?
If you are really interested, it's the Brazillian site http://www.superanimes.com.br
In this case, the website it self is not the application. The website is just a data source. The application that you would be interfacing would be whatever you are using to grab the data which would most likely your web browser. In that case there is already an API for this kind of stuff.
I haven't worked too much with the Chrome Native Client API NaCl (why does nobody call this 'salt'?). I'm really not sure what it's capable of or if it's the correct solution for you.