RTP Payload Format for Elementary Streams with MPEG Surround Multi-Channel Audio
RFC 5691
| Document | Type |
RFC - Proposed Standard
(October 2009; No errata)
Updates RFC 3640
Was draft-ietf-avt-rtp-mps (avt WG)
|
|
|---|---|---|---|
| Last updated | 2015-10-14 | ||
| Replaces | draft-schmidt-avt-mps | ||
| Stream | IETF | ||
| Formats | plain text pdf html bibtex | ||
| Reviews | |||
| Stream | WG state | (None) | |
| Document shepherd | No shepherd assigned | ||
| IESG | IESG state | RFC 5691 (Proposed Standard) | |
| Consensus Boilerplate | Unknown | ||
| Telechat date | |||
| Responsible AD | Cullen Jennings | ||
| Send notices to | (None) | ||
Network Working Group F. de Bont
Request for Comments: 5691 Philips Electronics
Updates: 3640 S. Doehla
Category: Standards Track Fraunhofer IIS
M. Schmidt
Dolby Laboratories
R. Sperschneider
Fraunhofer IIS
October 2009
RTP Payload Format for Elementary Streams
with MPEG Surround Multi-Channel Audio
Abstract
This memo describes extensions for the RTP payload format defined in
RFC 3640 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 that doesn't use 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.
Status of This Memo
This document specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.
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
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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 BSD License.
de Bont, et al. Standards Track [Page 1]
RFC 5691 Transport of MPEG Surround October 2009
Table of Contents
1. Introduction ....................................................2
2. Conventions .....................................................3
3. Definitions and Abbreviations ...................................3
3.1. Definitions ................................................3
3.2. Abbreviations ..............................................4
4. Transport of MPEG Surround ......................................4
4.1. Embedded Spatial Audio Data in AAC Payloads ................4
4.2. MPEG Surround Elementary Stream ............................5
4.2.1. Low Bitrate MPEG Surround ...........................7
4.2.2. High Bitrate MPEG Surround ..........................8
5. IANA Considerations .............................................8
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. References .....................................................11
7.1. Normative References ......................................11
7.2. Informative References ....................................11
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 < N transmitted
channels and additional control data. In the preferred modes of
operating the Spatial Audio Coding system, the M channels can either
be a single mono channel or a stereo channel pair. The control data
represents a significantly lower data rate than the data rate
required for transmitting all N channels, making the coding very
efficient while at the same time ensuring compatibility with M
channel devices.
The MPEG Surround standard incorporates a number of tools that enable
features that allow for broad application of the standard. A key
feature is the ability to scale the spatial image quality gradually
from very low spatial overhead towards transparency. Another key
feature is that the decoder input can be made compatible to existing
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