RTP Payload Format for the Adaptive TRansform Acoustic Coding (ATRAC) Family
RFC 5584
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.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents in effect on the date of
publication of this document (http://trustee.ietf.org/license-info).
Please review these documents carefully, as they describe your rights
and restrictions with respect to this document.
This document may contain material from IETF Documents or IETF
Contributions published or made publicly available before November
10, 2008. The person(s) controlling the copyright in some of this
material may not have granted the IETF Trust the right to allow
modifications of such material outside the IETF Standards Process.
Without obtaining an adequate license from the person(s) controlling
the copyright in such materials, this document may not be modified
outside the IETF Standards Process, and derivative works of it may
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
7.6.2. For Media Subtype ATRAC3 ...........................23
7.6.3. For Media Subtype ATRAC-X ..........................23
Show full document text