RTP协议解析----Header扩展数据

lcyw

于 2020-06-15 14:04:04 发布

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本文介绍了RTP协议中头部扩展的数据格式和使用规则，分别根据RFC3550和RFC5285进行阐述。当RTP头的X位为1时，会添加可变长度的扩展头，包含16位长度字段，用于指示32位字的数量。扩展头仅允许一个，并且其16位开头用于区分不同类型的扩展。RFC5285则进一步详细解释了一字节和两字节头部扩展的情况。

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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

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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 prev

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