IETF Logo Mail Archive

Re: [MMUSIC] RID, MID and BUNDLE: Associate received RTP packet with m- line

Christer Holmberg <christer.holmberg@ericsson.com> Thu, 22 October 2015 19:02 UTC

Return-Path: <christer.holmberg@ericsson.com>
X-Original-To: mmusic@ietfa.amsl.com
Delivered-To: mmusic@ietfa.amsl.com
Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6AB021B3BE5 for <mmusic@ietfa.amsl.com>; Thu, 22 Oct 2015 12:02:17 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -4.2
X-Spam-Level:
X-Spam-Status: No, score=-4.2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001] autolearn=ham
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id QWvjiDXtk_gL for <mmusic@ietfa.amsl.com>; Thu, 22 Oct 2015 12:02:15 -0700 (PDT)
Received: from sessmg22.ericsson.net (sessmg22.ericsson.net [193.180.251.58]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 92E511B3BFD for <mmusic@ietf.org>; Thu, 22 Oct 2015 12:01:45 -0700 (PDT)
X-AuditID: c1b4fb3a-f79136d0000071e2-d8-56293297518a
Received: from ESESSHC013.ericsson.se (Unknown_Domain [153.88.253.124]) by sessmg22.ericsson.net (Symantec Mail Security) with SMTP id 86.1E.29154.79239265; Thu, 22 Oct 2015 21:01:43 +0200 (CEST)
Received: from ESESSMB209.ericsson.se ([169.254.9.61]) by ESESSHC013.ericsson.se ([153.88.183.57]) with mapi id 14.03.0248.002; Thu, 22 Oct 2015 21:01:43 +0200
From: Christer Holmberg <christer.holmberg@ericsson.com>
To: "Mo Zanaty (mzanaty)" <mzanaty@cisco.com>
Thread-Topic: [MMUSIC] RID, MID and BUNDLE: Associate received RTP packet with m- line
Thread-Index: AQHRDNf2Z7o8j5jJAkmJUjLXppd0Tp533jwA
Date: Thu, 22 Oct 2015 19:01:42 +0000
Message-ID: <7594FB04B1934943A5C02806D1A2204B37B89868@ESESSMB209.ericsson.se>
References: <7594FB04B1934943A5C02806D1A2204B37B87AF9@ESESSMB209.ericsson.se> <F4B61477-7BFB-4D20-8F49-E200D19A8911@cisco.com>
In-Reply-To: <F4B61477-7BFB-4D20-8F49-E200D19A8911@cisco.com>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
x-originating-ip: [153.88.183.150]
Content-Type: multipart/alternative; boundary="_000_7594FB04B1934943A5C02806D1A2204B37B89868ESESSMB209erics_"
MIME-Version: 1.0
X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprHIsWRmVeSWpSXmKPExsUyM+Jvje50I80wg571phZTlz9msXjxYA6T A5PHlN8bWT2WLPnJFMAUxWWTkpqTWZZapG+XwJVxYX99wbmQirdL17E0MC7w6mLk4JAQMJHY dIO9i5ETyBSTuHBvPVsXIxeHkMBRRolVH36wQziLGSWOrt/GCtLAJmAh0f1PG6RBREBX4t3v Z4wgYWYBdYmri4NAwsIC4RJz2qaxQ5RESDz8M4MRwjaSuNzfxQRiswioSnz9vpgVxOYV8JWY veIxE8SqBkaJc4vvgBVxCthKvP9+hQXEZgQ67vupNWBxZgFxiVtP5jNBHC0gsWTPeWYIW1Ti 5eN/rBC2ksSK7ZcYIerzJea9mMcGsUxQ4uTMJywTGEVnIRk1C0nZLCRlEHEdiQW7P7FB2NoS yxa+Zoaxzxx4zIQsvoCRfRWjaHFqcXFuupGRXmpRZnJxcX6eXl5qySZGYKwd3PLbagfjweeO hxgFOBiVeHgfcmmECbEmlhVX5h5ilOBgVhLh7X8KFOJNSaysSi3Kjy8qzUktPsQozcGiJM7b zPQgVEggPbEkNTs1tSC1CCbLxMEp1cA4zWdC2oK9FxaEfsi+4LcitaouvuMDQ6nV0a2t4qwv rvxMa3HImdBqYXRF9cf2zapswgVzLFznZV/YHhLI6vH+29EDDvUv9igHdS3dt2VTeMDd/bcM 51qf7tojnzU3167tmxBX7hStpfOaUsxL9/7/Z5Cx6viSjfHnK62utnax+V3q4eDZeeKGEktx RqKhFnNRcSIAefFIBLECAAA=
Archived-At: <http://mailarchive.ietf.org/arch/msg/mmusic/OCDqlA_10w8DuREfBDwN5yN0n6E>
Cc: "mmusic@ietf.org" <mmusic@ietf.org>
Subject: Re: [MMUSIC] RID, MID and BUNDLE: Associate received RTP packet with m- line
X-BeenThere: mmusic@ietf.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: Multiparty Multimedia Session Control Working Group <mmusic.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/mmusic>, <mailto:mmusic-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/mmusic/>
List-Post: <mailto:mmusic@ietf.org>
List-Help: <mailto:mmusic-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/mmusic>, <mailto:mmusic-request@ietf.org?subject=subscribe>
X-List-Received-Date: Thu, 22 Oct 2015 19:02:17 -0000

Hi,

>MID and RID are both RTCP SDES items that echo SDP identifiers in RTP/RTCP using the generic sdes->hdrext mechanism. Once the identifier value is associated to an RTP stream (identified by its SSRC) via >RTCP packets with MID/RID SDES items or RTP packets with MID/RID header extensions, the >association can remain in effect without echoing the header extension in every RTP packet.
>
>We should probably add some text to warn implementers not to rely on receiving MID and RID in >every RTP packet, and use the last valid association to that SSRC when absent.

Or, you could simply refer to BUNDLE, because this is only going to be an issue when BUNDLE is used.

Regards,

Christer


Mo

On Oct 22, 2015, at 9:53 AM, Christer Holmberg <christer.holmberg@ericsson.com<mailto:christer.holmberg@ericsson.com>> wrote:
Hi,

Section 7 of the RID draft says:

"Note that 'rid's are only required to be unique within a media
   section ("m-line"); they do not necessarily need to be unique within
   an entire RTP session.  In traditional usage, each media section is
   sent on its own unique 5-tuple, which provides an unambiguous scope.
   Similarly, when using BUNDLE
   [I-D.ietf-mmusic-sdp-bundle-negotiation], MID values associate RTP
   streams uniquely to a single media description."

However, when BUNDLE is used, the MID value (RTP MID header extension) is not guaranteed to be present in every RTP packet. Section 14.1. of BUNDLE says:

"The RTP MID header extension SHOULD be included in some RTP packets
   at the start of the session and whenever the SSRC changes.  It might
   also be useful to include the header extension in RTP packets that
   comprise random access points in the media (e.g., with video
   I-frames)."

So, if the MID value is NOT included, and RTP packets associated with multiple m- lines use the same RIP value and the same PT value, will it be possible to associate the RTP packets to a single media description?

Regards,

Christer

_______________________________________________
mmusic mailing list
mmusic@ietf.org<mailto:mmusic@ietf.org>
https://www.ietf.org/mailman/listinfo/mmusic

v2.23.0 | Report a Bug | By Email