RTP Payload Format for Standard apt-X and Enhanced apt-X Codecs
RFC 7310

Document Type RFC - Proposed Standard (July 2014; No errata)
Last updated 2014-07-29
Replaces draft-lindsay-payload-rtp-aptx
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Stream WG state Submitted to IESG for Publication
Consensus Yes
Document shepherd Ali Begen
Shepherd write-up Show (last changed 2013-11-05)
IESG IESG state RFC 7310 (Proposed Standard)
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Responsible AD Richard Barnes
Send notices to payload-chairs@ietf.org, draft-ietf-payload-rtp-aptx@ietf.org
IANA IANA review state Version Changed - Review Needed
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Internet Engineering Task Force (IETF)                        J. Lindsay
Request for Comments: 7310                                   H. Foerster
Category: Standards Track                                        APT Ltd
ISSN: 2070-1721                                                July 2014

    RTP Payload Format for Standard apt-X and Enhanced apt-X Codecs

Abstract

   This document specifies a scheme for packetizing Standard apt-X or
   Enhanced apt-X encoded audio data into Real-time Transport Protocol
   (RTP) packets.  The document describes a payload format that permits
   transmission of multiple related audio channels in a single RTP
   payload and a means of establishing Standard apt-X and Enhanced apt-X
   connections through the Session Description Protocol (SDP).

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7310.

Copyright Notice

   Copyright (c) 2014 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
   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.

Lindsay & Foerster           Standards Track                    [Page 1]
RFC 7310                    apt-X RTP Format                   July 2014

Table of Contents

   1. Introduction ....................................................2
   2. Conventions .....................................................3
   3. Standard apt-X and Enhanced apt-X Codecs ........................3
   4. Payload Format Capabilities .....................................5
      4.1. Use of Forward Error Correction (FEC) ......................5
   5. Payload Format ..................................................5
      5.1. RTP Header Usage ...........................................5
      5.2. Payload Structure ..........................................6
      5.3. Default Packetization Interval .............................7
      5.4. Implementation Considerations ..............................8
      5.5. Payload Example ............................................8
   6. Payload Format Parameters ......................................10
      6.1. Media Type Definition .....................................10
      6.2. Mapping to SDP ............................................12
           6.2.1. SDP Usage Examples .................................13
           6.2.2. Offer/Answer Considerations ........................14
   7. IANA Considerations ............................................14
   8. Security Considerations ........................................14
   9. Acknowledgements ...............................................14
   10. References ....................................................15
      10.1. Normative References .....................................15
      10.2. Informative References ...................................15

1.  Introduction

   This document specifies the payload format for packetization of audio
   data encoded with the Standard apt-X or Enhanced apt-X audio coding
   algorithms into the Real-time Transport Protocol (RTP) [RFC3550].

   The document outlines some conventions, a brief description of the
   operating principles of the audio codecs, and the payload format
   capabilities.  The RTP payload format is detailed, and a relevant
   example of the format is provided.  The media type, its mappings to
   SDP [RFC4566], and its usage in the SDP offer/answer model are also
   specified.  Finally, some security considerations are outlined.

   This document registers a media type (audio/aptx) for the RTP payload
   format for the Standard apt-X and Enhanced apt-X audio codecs.

Lindsay & Foerster           Standards Track                    [Page 2]
RFC 7310                    apt-X RTP Format                   July 2014
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