Live555通过SDP文本信息实现对RTP的接收
笔者最近因为工做中需要用到此功能，特把实现方法分享给有兴趣的网友。
我的方法来自Live555官方论坛最权威的方案，如下：
[Live-devel] Once again, SDP support for Live555 & interaction with FFMpeg
1.First, create a “MediaSession” object, by calling
“MediaSession::createNew()”, with the SDP description (string) as
parameter.
2.Then, go through each of this obj[......]