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Errors when identifying a m-line in addIceCandidate() (issue #551)

From: Adam Bergkvist <adam.bergkvist@ericsson.com>
Date: Thu, 17 Mar 2016 07:41:08 +0000
To: "public-webrtc@w3.org" <public-webrtc@w3.org>
Message-ID: <A222C88B6882744D8D4B9681B315889029624280@ESESSMB307.ericsson.se>
Hi

We have two pieces of information in an ice candidate to identify a 
m-line sdpMid and sdpMLineIndex.

The successful case is when both identifiers points to the same m-line 
or if one identifies an m-line while the other is null.

We have the following uncertain/error cases
1. Both are set, one identifies an m-line while the other is bogus.
2. Both are set and point to different m-lines.
3. One is set, and points to an non-existent m-line (clearly an error).

So the first question is: what should we do in 1 and 2?

The second question is where this should be specified. addIceCandidate() 
is specified to do some synchronous checks on the candidate argument and 
then start a 'process to apply' the candidate. We could either check for 
the above errors in the synchronous section and specify it in the 
webrtc-pc document. The alternative is to let these checks be part of 
the 'process to apply' candidate and let the error be asynchronously 
reported to JavaScript. In the second case, JSEP would need to specify this.

This is also tracked as issue #551 [1]

/Adam

[1] https://github.com/w3c/webrtc-pc/issues/551
Received on Thursday, 17 March 2016 07:41:40 UTC

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