Introduction to core functions of webrtc -- an article on understanding SDP PlanB unifiedplan (migrating from PlanB to unifiedplan)

 

The first sentence at the beginning , A lot of people SDP hate .

SDP Is text based , It's not a transport protocol in itself , Just a text description of the conversation ,SDP The negotiation and exchange of usually depend on other transport protocols .

When I introduced other knowledge points , More or less mentioned SDP, But it's not detailed enough , Not deep enough , There is no feeling of sudden enlightenment . That must be no promise , So let's have another in-depth talk SDP.

in addition , If English is good enough , There's no need to look down , Read the documents by yourself ：

RFC 8866 - SDP: Session Description Protocol

What is SDP？

The introduction is the same , Copying each other .

SDP yes WebRTC An important part of , Even the most important part .SDP（Session Description Protocol） Is a general session description protocol , Mainly used to describe multimedia conversation .

It does not transmit media data , But it is used for various audio and video codecs between users 、 Negotiation of network and other equipment information .

In short , We need a string based configuration file , It contains all the information about the user's device .

The format is similar ini file ,key、value form

key = value\n

WebRTC Use Of