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RTP Payload Format for AC-3 Audio (RFC4184)

IP.com Disclosure Number: IPCOM000130115D
Original Publication Date: 2005-Oct-01
Included in the Prior Art Database: 2005-Oct-12
Document File: 14 page(s) / 25K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

B. Link: AUTHOR [+3]

Abstract

This document describes an RTP payload format for transporting audio data using the AC-3 audio compression standard. AC-3 is a high quality, multichannel audio coding system that is used for United States HDTV, DVD, cable television, satellite television and other media. The RTP payload format presented in this document includes support for data fragmentation.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 11% of the total text.

Network Working Group                                            B. Link
Request for Comments: 4184                                      T. Hager
Category: Standards Track                             Dolby Laboratories
                                                                J. Flaks
                                                   Microsoft Corporation
                                                            October 2005


                   RTP Payload Format for AC-3 Audio

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) The Internet Society (2005).

Abstract

   This document describes an RTP payload format for transporting audio
   data using the AC-3 audio compression standard.  AC-3 is a high
   quality, multichannel audio coding system that is used for United
   States HDTV, DVD, cable television, satellite television and other
   media.  The RTP payload format presented in this document includes
   support for data fragmentation.

1.  Introduction

   AC-3 [ATSC] is a high-quality audio codec (audio coding format)
   designed to encode multiple channels of audio into a low bit-rate
   format.  AC-3 achieves its large compression ratios via encoding a
   multiplicity of channels as a single entity.  Dolby Digital, which is
   a branded version of AC-3, encodes up to 5.1 channels of audio.

   AC-3 has been adopted as an audio compression scheme for many
   consumer and professional applications.  It is a mandatory audio
   codec for DVD-video, Advanced Television Standards Committee (ATSC)
   digital terrestrial television and Digital Living Network Alliance
   (DLNA) home networking, as well as an optional multichannel audio
   format for DVD-audio.

   There is a need to stream AC-3 data over IP networks.  The Internet
   Real Time Protocol (RTP) provides a mechanism for stream

Link, et al.                Standards Track                     [Page 1]
RFC 4184                  RTP Payload for AC-3              October 2005


   synchronization and hence serves as the best transport solution for
   AC-3, which is primarily used in audio-for-video applications.
   Applications for streaming AC-3 include streaming movies from a home
   media server to a display,...