AVT F. de Bont Internet-Draft Philips Electronics Updates: 3640 (if approved) S. Doehla Intended status: Standards Track Fraunhofer IIS Expires: July 26, 2009 M. Schmidt Dolby Laboratories R. Sperschneider Fraunhofer IIS January 22, 2009 RTP Payload Format for Elementary Streams with MPEG Surround multi- channel audio draft-ietf-avt-rtp-mps-02.txt Status of this Memo This Internet-Draft is submitted to IETF in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet- Drafts. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." The list of current Internet-Drafts can be accessed at http://www.ietf.org/ietf/1id-abstracts.txt. The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html. This Internet-Draft will expire on July 26, 2009. Copyright Notice Copyright (c) 2009 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 de Bont, et al. Expires July 26, 2009 [Page 1] Internet-Draft Transport of MPEG Surround January 2009 to this document. Abstract This memo describes extensions for the RTP payload format defined in RFC3640 for the transport of MPEG Surround multi-channel audio. Additional Media Type parameters are defined to signal backwards compatible transmission inside an MPEG-4 audio elementary stream. In addition a layered transmission scheme without using the MPEG-4 systems framework is presented to transport an MPEG Surround elementary stream via RTP in parallel with an RTP stream containing the downmixed audio data. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 2. Conventions . . . . . . . . . . . . . . . . . . . . . . . . . 3 3. Definitions and Abbreviations . . . . . . . . . . . . . . . . 4 3.1. Definitions . . . . . . . . . . . . . . . . . . . . . . . 4 3.2. Abbreviations . . . . . . . . . . . . . . . . . . . . . . 4 4. Transport of MPEG Surround . . . . . . . . . . . . . . . . . . 4 4.1. Embedded spatial audio data in AAC payloads . . . . . . . 5 4.2. MPEG Surround Elementary Stream . . . . . . . . . . . . . 6 4.2.1. Low Bit-rate MPEG Surround . . . . . . . . . . . . . . 7 4.2.2. High Bit-rate MPEG Surround . . . . . . . . . . . . . 8 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 9 5.1. Media Type registration . . . . . . . . . . . . . . . . . 9 5.2. Registration of Mode Definitions with IANA . . . . . . . . 9 5.3. Usage of SDP . . . . . . . . . . . . . . . . . . . . . . . 10 6. Security Considerations . . . . . . . . . . . . . . . . . . . 10 7. Normative References . . . . . . . . . . . . . . . . . . . . . 10 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 11 de Bont, et al. Expires July 26, 2009 [Page 2] Internet-Draft Transport of MPEG Surround January 2009 1. Introduction MPEG Surround (Spatial Audio Coding, SAC) [23003-1] is an International Standard that was finalized by MPEG in January 2007. It is capable of re-creating N channels based on M