Content Splicing for RTP Sessions
draft-ietf-avtext-splicing-for-rtp-07

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Document Type Active Internet-Draft (avtext WG)
Last updated 2012-05-10 (latest revision 2012-02-19)
Replaces draft-xia-avtext-splicing-for-rtp
Stream IETF
Intended RFC status Informational
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Document shepherd Magnus Westerlund
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IESG IESG state IESG Evaluation::Revised I-D Needed
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Responsible AD Gonzalo Camarillo
IESG note Magnus Westerlund (magnus.westerlund@ericsson.com) is the document shepherd.
Send notices to avtext-chairs@tools.ietf.org, draft-ietf-avtext-splicing-for-rtp@tools.ietf.org
AVTEXT Working Group                                              J. Xia
Internet-Draft                                                    Huawei
Intended status: Informational                         February 20, 2012
Expires: August 23, 2012

                   Content Splicing for RTP Sessions
                 draft-ietf-avtext-splicing-for-rtp-07

Abstract

   This memo outlines RTP splicing.  Splicing is a process that replaces
   the content of the main multimedia stream with other multimedia
   content, and delivers the substitutive multimedia content to receiver
   for a period of time.  This memo provides some RTP splicing use
   cases, then we enumerate a set of requirements and analyze whether an
   existing RTP level middlebox can meet these requirements, at last we
   provide concrete guidelines for how the chosen middlebox works to
   handle RTP splicing.

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
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   Internet-Drafts are draft documents valid for a maximum of six months
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   This Internet-Draft will expire on August 23, 2012.

Copyright Notice

   Copyright (c) 2012 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must

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   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  3
   3.  RTP Splicing Discussion and Requirements . . . . . . . . . . .  4
   4.  Recommended Solution for RTP Splicing  . . . . . . . . . . . .  7
     4.1.  RTP Processing in RTP Mixer  . . . . . . . . . . . . . . .  7
     4.2.  RTCP Processing in RTP Mixer . . . . . . . . . . . . . . .  9
     4.3.  Media Clipping Considerations  . . . . . . . . . . . . . . 10
     4.4.  Congestion Control Considerations  . . . . . . . . . . . . 11
     4.5.  Processing Splicing in User Invisibility Case  . . . . . . 13
   5.  Implementation Considerations  . . . . . . . . . . . . . . . . 13
   6.  Security Considerations  . . . . . . . . . . . . . . . . . . . 14
   7.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 14
   8.  Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . 14
   9.  Change Log . . . . . . . . . . . . . . . . . . . . . . . . . . 14
     9.1.  draft-xia-avtext-splicing-for-rtp-01 . . . . . . . . . . . 14
     9.2.  draft-xia-avtext-splicing-for-rtp-00 . . . . . . . . . . . 14
   10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 15
     10.1. Normative References . . . . . . . . . . . . . . . . . . . 15
     10.2. Informative References . . . . . . . . . . . . . . . . . . 16
   Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 16

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1.  Introduction

   This document outlines how splicing can be used for RTP sessions.
   Splicing is a process that replaces the content of the main RTP
   stream with other multimedia content, and delivers the substitutive
   content to receiver for a period of time.  The substitutive content
   can be provided for example via another RTP stream or local media
   file storage.

   One representative use case for splicing is advertisements insertion,
   which allows operators to replace the national advertising content
   with its own regional advertising content prior to delivering the
   regional advertising content to receiver.

   Besides the advertisement insertion use case, there are other use
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