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SDP Parsing Error: End of line beyond end of buffer.
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André Silva
Sep 30, 2013, 1:59:12 PM9/30/13
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Hi all,
I'm creating an application that uses SIP as signalling protocol, so I need to wait for the ICE candidates list to be completed to send it to the other client. I am using 2 TURN servers and 1 STUN server, and it has been proven that all of them are needed to work in all networks that I need.
The problem is that Chrome creates an SDP with all the candidates and the result is a big SDP that can be found here http://d.pr/n/RM17
Between Chrome's everything works great with these big SDPs, but when Firefox receives a big SDP like this, an exception is thrown with this message:
Could not negotiate answer SDP; cause = ERR
SDP Parsing Error: End of line beyond end of buffer.
After some search I found the function sdp_parse where this fails, and it seems that the SDP does not fit in the created buffer.
Also it seems like Firefox SDP parser is limited to a 16bits uint length.
http://people.mozilla.org/~choller/firefox/coverage/mc-coverage-20121101-482d32e2b348/media/webrtc/signaling/src/sipcc/core/sdp/sdp_main.c.gcov.html#894
If I define only the STUN server, the SDP is smaller(with less candidates) and it works with Firefox.
Who's wrong? Does the SDP's have a limit defined in some RFC or is it just an assumption made by Firefox that the SDP will never reach this size?
I'm creating an application that uses SIP as signalling protocol, so I need to wait for the ICE candidates list to be completed to send it to the other client. I am using 2 TURN servers and 1 STUN server, and it has been proven that all of them are needed to work in all networks that I need.
The problem is that Chrome creates an SDP with all the candidates and the result is a big SDP that can be found here http://d.pr/n/RM17
Between Chrome's everything works great with these big SDPs, but when Firefox receives a big SDP like this, an exception is thrown with this message:
Could not negotiate answer SDP; cause = ERR
SDP Parsing Error: End of line beyond end of buffer.
After some search I found the function sdp_parse where this fails, and it seems that the SDP does not fit in the created buffer.
Also it seems like Firefox SDP parser is limited to a 16bits uint length.
http://people.mozilla.org/~choller/firefox/coverage/mc-coverage-20121101-482d32e2b348/media/webrtc/signaling/src/sipcc/core/sdp/sdp_main.c.gcov.html#894
If I define only the STUN server, the SDP is smaller(with less candidates) and it works with Firefox.
Who's wrong? Does the SDP's have a limit defined in some RFC or is it just an assumption made by Firefox that the SDP will never reach this size?
Adam Roach
Sep 30, 2013, 2:40:52 PM9/30/13
to André Silva, dev-...@lists.mozilla.org
André:
The SDP you indicate has only ~5,300 bytes in it, which is much less
than can fit in a 64k byte buffer.
The problem you're running into actually happens much earlier than that:
we use DOMString to pass our SDP from the javascript down to the C code,
and Firefox appears to currently restrict DOMString to 4k in length.
I have opened Bug 922245 to track this issue. Thanks for bringing this
to our attention.
https://bugzilla.mozilla.org/show_bug.cgi?id=922245
/a
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> dev-...@lists.mozilla.org
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--
Adam Roach
Principal Platform Engineer
a...@mozilla.com
+1 650 903 0800 x863
The SDP you indicate has only ~5,300 bytes in it, which is much less
than can fit in a 64k byte buffer.
The problem you're running into actually happens much earlier than that:
we use DOMString to pass our SDP from the javascript down to the C code,
and Firefox appears to currently restrict DOMString to 4k in length.
I have opened Bug 922245 to track this issue. Thanks for bringing this
to our attention.
https://bugzilla.mozilla.org/show_bug.cgi?id=922245
/a
> dev-media mailing list
> dev-...@lists.mozilla.org
> https://lists.mozilla.org/listinfo/dev-media
--
Adam Roach
Principal Platform Engineer
a...@mozilla.com
+1 650 903 0800 x863
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