how to play video(RTMP) from live camrea in ios

I want to play video (RTMP link maybe) from a live camera in my iPhone app. (suppose i want to do somthing like this link: http://www.earthcam.com/world/france/paris/?cam=eiffeltower_hd) and how can I do something like that for streaming audio instead of video (Radio stations). can you guide me or introduce me an open source component? (free or a cheap one)