SDP

All posts tagged SDP

webrtcH4cKS: ~ Anatomy of a WebRTC SDP (Antón Román)

Posted by Victor Pascual on January 14, 2014
Posted in: Guide.
Tagged: , , .
4 comments

Editor note: see the updated version of this post here.

As described in previous posts, WebRTC does not specify a particular signalling model other than the generic need to exchange Session Description Protocol (SDP) media descriptions in the offer/answer fashion.

During the last few months, my friend  Antón Román (CTO of Quobis) and I spent a lot of time with our team figuring out how to manipulate and adapt the SDP’s generated by web browsers to make them compatible with the different server/gateway technologies we’re working with.

As WebRTC makes use of new mechanisms but also existing ones that have seen few  deployment in real networks to date. SDP’s generated by Web Browsers are more complex and contain a number of new attributes that are unfamiliar in SIP or IMS networks. In the following post, Antón analyses the anatomy of a WebRTC SDP, giving a detailed description of what all those lines do. ...  Continue reading

webrtcH4cKS: ~ Updated: Why the WebRTC API has it wrong – Interview with WebRTC Object API (ORTC) co-author Iñaki Baz

Posted by Chad Hart on August 26, 2013
Posted in: Standards.
Tagged: , , , .
8 comments

Updated 25 Aug 2013 –  some minor edits fixing some ORTC API references and added ORTC sample code.

In my post on WebRTC standardization I mentioned that one of the controversial points of discussion in the W3C context was whether the SDP Offer/Answer model and the current API provided the level of flexibility a wide range of WebRTC use cases would require. In order to avoid the endless and repetitive discussions that have already occurred on this topic, developers unsatisfied with the current API have just announced an alternative to the existing WebRTC API. This new proposal is called WebRTC Object API, motivation behind it is presented in this IETF draft and some example code can be found on GitHub. Note that this is not the first time an alternative API aiming to provide more control to web developers has been proposed- Microsoft’s CU-RTC-Web introduced last year took a similar approach by introducing an alternative along with a working prototype. ...  Continue reading