RTP Payload Format for the Adaptive TRansform Acoustic Coding (ATRAC) Family
RFC 5584

 
Document Type RFC - Proposed Standard (July 2009; Errata)
Last updated 2013-03-02
Replaces draft-hatanaka-avt-rtp-atrac-family
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IESG IESG state RFC 5584 (Proposed Standard)
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Responsible AD Cullen Jennings
Send notices to avt-chairs@ietf.org, draft-ietf-avt-rtp-atrac-family@ietf.org
Network Working Group                                        M. Hatanaka
Request for Comments: 5584                                  J. Matsumoto
Category: Standards Track                               Sony Corporation
                                                               July 2009

                        RTP Payload Format for
         the Adaptive TRansform Acoustic Coding (ATRAC) Family

Abstract

   This document describes an RTP payload format for efficient and
   flexible transporting of audio data encoded with the Adaptive
   TRansform Audio Coding (ATRAC) family of codecs.  Recent enhancements
   to the ATRAC family of codecs support high-quality audio coding with
   multiple channels.  The RTP payload format as presented in this
   document also includes support for data fragmentation, elementary
   redundancy measures, and a variation on scalable streaming.

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.

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   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
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   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

Hatanaka & Matsumoto        Standards Track                     [Page 1]
RFC 5584          RTP Payload Format for ATRAC Family          July 2009

Table of Contents

   1. Introduction ....................................................3
   2. Conventions Used in This Document ...............................3
   3. Codec-Specific Details ..........................................3
   4. RTP Packetization and Transport of ATRAC-Family Streams .........4
      4.1. ATRAC Frames ...............................................4
      4.2. Concatenation of Frames ....................................4
      4.3. Frame Fragmentation ........................................4
      4.4. Transmission of Redundant Frames ...........................4
      4.5. Scalable Lossless Streaming (High-Speed Transfer Mode) .....5
           4.5.1. Scalable Multiplexed Streaming ......................5
           4.5.2. Scalable Multi-Session Streaming ....................5
   5. Payload Format ..................................................6
      5.1. Global Structure of Payload Format .........................6
      5.2. Usage of RTP Header Fields .................................7
      5.3. RTP Payload Structure ......................................8
           5.3.1. Usage of ATRAC Header Section .......................8
           5.3.2. Usage of ATRAC Frames Section .......................9
   6. Packetization Examples .........................................12
      6.1. Example Multi-Frame Packet ................................12
      6.2. Example Fragmented ATRAC Frame ............................13
   7. Payload Format Parameters ......................................14
      7.1. ATRAC3 Media Type Registration ............................14
      7.2. ATRAC-X Media Type Registration ...........................16
      7.3. ATRAC Advanced Lossless Media Type Registration ...........18
      7.4. Channel Mapping Configuration Table .......................20
      7.5. Mapping Media Type Parameters into SDP ....................21
           7.5.1. For Media Subtype ATRAC3 ...........................21
           7.5.2. For Media Subtype ATRAC-X ..........................21
           7.5.3. For Media Subtype ATRAC Advanced Lossless ..........22
      7.6. Offer/Answer Model Considerations .........................22
           7.6.1. For All Three Media Subtypes .......................22
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