W3C home > Mailing lists > Public > public-webrtc@w3.org > August 2013

Re: SDP DataChannels

From: <piranna@gmail.com>
Date: Sat, 3 Aug 2013 09:26:06 +0200
Message-ID: <CAKfGGh3yJnDc_kYzAfS1EBj3YNE=Qy1jJcNq9+Hhsh7sYH+EYA@mail.gmail.com>
To: Eric Rescorla <ekr@rtfm.com>
Cc: public-webrtc <public-webrtc@w3.org>
Good to know it for reference, seems to be fairly more complicated
(interesting to see the IP and ports of each one of the DataChannels...
El 03/08/2013 08:12, "Eric Rescorla" <ekr@rtfm.com> escribió:

>
>
>
> On Sat, Aug 3, 2013 at 1:29 AM, piranna@gmail.com <piranna@gmail.com>wrote:
>
>> I've just been able to generate an offer only with DataChannels (seems
>> the fact that audio m-lines where added on Chrome due a bug on the
>> mediaConstraints, and that was the reason why SDP strings were so
>> long) and I've been able to dump the generated SDP, being now more
>> confident that SDP is not the best format at least for this use case
>> (only DataChannels). Could be any body explain me why there are so
>> much (almost) duplicated lines? What are the essential ones? What are
>> just the essential bits of data required to create this DataChannels?
>>
>
> It's probably better to look at the SDP from Firefox because Chrome doesn't
> currently implement the  data channel specification. Here is what the
> Firefox
> SDP looks like:
>
> v=0
> o=Mozilla-SIPUA-25.0a1 12613 0 IN IP4 0.0.0.0
> s=SIP Call
> t=0 0
> a=ice-ufrag:9638f069
> a=ice-pwd:90f72795622bd286d75dde68d9b7e02f
> a=fingerprint:sha-256
> 7C:CE:6B:7A:D4:B0:2E:D7:0C:76:07:59:B5:9E:28:5C:14:6C:00:D7:E0:10:C6:CD:25:8B:4B:E8:1D:CC:FC:4F
> m=application 51189 DTLS/SCTP 5000
> c=IN IP4 89.246.150.136
> a=fmtp:5000 protocol=webrtc-datachannel;streams=16
> a=sendrecv
> a=candidate:0 1 UDP 2113601791 10.0.1.158 53229 typ host
> a=candidate:1 1 UDP 1694236671 89.246.150.136 51189 typ srflx raddr
> 10.0.1.158 rport 53229
> a=candidate:0 2 UDP 2113601790 10.0.1.158 54571 typ host
> a=candidate:1 2 UDP 1694236670 89.246.150.136 55176 typ srflx raddr
> 10.0.1.158 rport 54571
>
>
>
>
>
Received on Saturday, 3 August 2013 07:26:34 UTC

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