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Re: Minimizing the protocol (Re: Data API)

From: Randell Jesup <randell-ietf@jesup.org>
Date: Thu, 01 Mar 2012 12:08:24 -0500
Message-ID: <4F4FAD08.5010207@jesup.org>
To: public-webrtc@w3.org
On 3/1/2012 10:17 AM, Cullen Jennings wrote:
> Hmm - All the Facetime I have seen does not use SCTP so uh, not sure what to say about that  - but I do agree it looks like in many cases Facetime does set up a communication channel between the endpoints then use that channel to directly do the SDP negotiate media.

Yes, I think that was Harald's point.

> One of the apps I have been thinking about would use the web server to instantly bring up a data channel - this does not need much user authorization as no media is being sent so it can happen fairly early and quickly. From that point on, all SDP to add more media channels and such would be passed back and forth between the browsers over the direct data channel. (This is the "low path" from the slides I had long ago). It's not like this data channel has to be channel 0 or anything - it's just a data channel like any other. And it's not like the browser has to have any awareness of this - the JS app is just set up a data channel and using it. The only thing the JS app has to be careful of is that it does not tear down the data channel.

Yes, exactly - an excellent use of the data channel for many possible 
apps.  We do need to keep the server channel available, since I think we 
need it to handle reconnection of the data channels on IP address change 
(to exchange new ICE candidates).  As I mentioned, 
pc.createDataChannel("signaling",...) :-)

-- 
Randell Jesup
randell-ietf@jesup.org
Received on Thursday, 1 March 2012 17:10:42 GMT

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