RTP协议解析----Header扩展数据

RTP头部中扩展数据有两种方式，分别在RFC3550 和 RFC5285定义

RFC3550中关于rtp扩展头的定义

5.3.1 RTP Header Extension

An extension mechanism is provided to allow individual implementations to experiment with new payload-format-independent functions that require additional information to be carried in the RTP data packet header. This mechanism is designed so that the header extension may be ignored by other interoperating implementations that have not been extended.

Note that this header extension is intended only for limited use. Most potential uses of this mechanism would be better done another way, using the methods described in the previous section. For example, a profile-specific extension to the