There is no "C" standard for RTP. The particular code is only as good as the programmers who wrote it and commented/documented it. I'm not aware of an example for which give you intro to RTP
But somewhere is hope,you will find some related information like live555 is useful libraries and code examples of how to stream stuff from your own app
Also some RTP code here i don't know how it works but you researched about RTP Protocol,so might be you get batter idea.