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Re: [MMUSIC] MSID and mslabel

Harald Alvestrand <harald@alvestrand.no> Wed, 24 October 2012 16:40 UTC

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Date: Wed, 24 Oct 2012 18:40:38 +0200
From: Harald Alvestrand <harald@alvestrand.no>
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Subject: Re: [MMUSIC] MSID and mslabel
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On 10/23/2012 09:00 PM, Bernard Aboba wrote:
> Miguel Garcia said:
>
> >
> > Bernard,
> >
> > I cannot identify the "mslabel" attribute. Do you know where it is 
> specified?
> >
> > Perhaps you refer to the "label" attribute (RFC 4574).
> >
> > /Miguel
>
> [BA] As Harald noted (see 
> http://www.ietf.org/mail-archive/web/mmusic/current/msg09712.html),
> "mslabel" is used within a=ssrc lines, presumably for a similar 
> purpose that "msid" is proposed for.

 From a quick look at the source code, it looks like an identifier for a 
synchronization context - so it's a synonym for cname, more or less.

> An example:
>
> SDP from createOffer(), Chrome Version 24.0.1297.0 dev
>
> v=0
> o=- 1321413050 2 IN IP4 127.0.0.1
> s=-
> t=0 0
> a=group:BUNDLE audio video
> m=audio 1 RTP/SAVPF 103 104 0 8 106 105 13 126
> c=IN IP4 0.0.0.0
> a=rtcp:1 IN IP4 0.0.0.0
> a=ice-ufrag:9wMh/Gc6fgJBzvzQ
> a=ice-pwd:4I4SozPeoRtm9C58OF8M/deY
> a=ice-options:google-ice
> a=sendrecv
> a=mid:audio
> a=rtcp-mux
> a=crypto:1 AES_CM_128_HMAC_SHA1_80 
> inline:JyWcGXs7j0U5aWAj8RlUdSwWkBRtmbvg3njMO1FB
> a=rtpmap:103 ISAC/16000
> a=rtpmap:104 ISAC/32000
> a=rtpmap:0 PCMU/8000
> a=rtpmap:8 PCMA/8000
> a=rtpmap:106 CN/32000
> a=rtpmap:105 CN/16000
> a=rtpmap:13 CN/8000
> a=rtpmap:126 telephone-event/8000
> a=ssrc:1635880669 cname:ZXVf3drwG3fT+Wh5
> a=ssrc:1635880669 mslabel:cLFXFpfLOP31s7D1A9on2I2rAvhTKqGSZEWr
> a=ssrc:1635880669 label:cLFXFpfLOP31s7D1A9on2I2rAvhTKqGSZEWr00
> m=video 1 RTP/SAVPF 100 101 102
> c=IN IP4 0.0.0.0
> a=rtcp:1 IN IP4 0.0.0.0
> a=ice-ufrag:9wMh/Gc6fgJBzvzQ
> a=ice-pwd:4I4SozPeoRtm9C58OF8M/deY
> a=ice-options:google-ice
> a=sendrecv
> a=mid:video
> a=rtcp-mux
> a=crypto:1 AES_CM_128_HMAC_SHA1_80 
> inline:JyWcGXs7j0U5aWAj8RlUdSwWkBRtmbvg3njMO1FB
> a=rtpmap:100 VP8/90000
> a=rtpmap:101 red/90000
> a=rtpmap:102 ulpfec/90000
> a=ssrc:1563041388 cname:ZXVf3drwG3fT+Wh5
> a=ssrc:1563041388 mslabel:cLFXFpfLOP31s7D1A9on2I2rAvhTKqGSZEWr
> a=ssrc:1563041388 label:cLFXFpfLOP31s7D1A9on2I2rAvhTKqGSZEWr10
>
>
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