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RTP Payload Format for 12-bit DAT Audio and 20- and 24-bit Linear Sampled Audio (RFC3190)

IP.com Disclosure Number: IPCOM000006623D
Original Publication Date: 2002-Jan-01
Included in the Prior Art Database: 2002-Jan-23
Document File: 18 page(s) / 35K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

K. Kobayashi: AUTHOR [+4]

Abstract

This document specifies a packetization scheme for encapsulating 12-bit nonlinear, 20-bit linear, and 24-bit linear audio data streams using the Real-time Transport Protocol (RTP). This document also specifies the format of a Session Description Protocol (SDP) parameter to indicate when audio data is preemphasized before sampling. The parameter may be used with other audio payload formats, in particular L16 (16-bit linear).

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 10% of the total text.

Network Working Group                                       K. Kobayashi

Request for Comments: 3190             Communication Research Laboratory

Category: Standards Track                                       A. Ogawa

                                                         Keio University

                                                               S. Casner

                                                           Packet Design

                                                              C. Bormann

                                                 Universitaet Bremen TZI

                                                            January 2002

                         RTP Payload Format for

        12-bit DAT Audio and 20- and 24-bit Linear Sampled 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 (2002).  All Rights Reserved.

Abstract

   This document specifies a packetization scheme for encapsulating

   12-bit nonlinear, 20-bit linear, and 24-bit linear audio data streams

   using the Real-time Transport Protocol (RTP).  This document also

   specifies the format of a Session Description Protocol (SDP)

   parameter to indicate when audio data is preemphasized before

   sampling.  The parameter may be used with other audio payload

   formats, in particular L16 (16-bit linear).

1. Introduction

   This document describes the sampling of audio data in 12-bit

   nonlinear, 20-bit linear, and 24-bit linear encodings, and specifies

   the encapsulation of the audio data into the Real-time Transport

   Protocol (RTP), version 2 [1,2].  DAT (digital audio tape) and DV

   (digital video) devices [3,4] use these audio encodings in addition

   to 16-bit linear encoding.  The packetization scheme for 16-bit

   linear audio (L16) is already specified [2,5].  This document

   specifies the packetization scheme for the other encodings following

   that for L16; in particular, when used with the RTP profile [2],

   these payload formats follow the encoding-independent rules for

Kobayashi, et al.           Standards Track                     [Page 1]

RFC 3190                  RTP Payload Format                January 2002

   sample ordering and channel interleaving specified in [2] plus

   extensions specified here.  This document also specifies out-of-band

   negotiation methods for the extended channel interleaving rules and

   for use when an analog preemphasis technique is applied to the audio

   data.

1.1 Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",

   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this

   document are to be interpreted as described in RFC 2119 [6]

2. The need for RTP encapsulation of 12-, 20- and 24-bit audio

   Many high-quality digital audio and visual systems, such as DAT and

   DV, adopt sample-based audio encodings.  Different audio formats are

   used in various situations.  To transport the audio data using RTP,

   an encapsulation needs to be defined for each specific format.  Only

   16-bit linear audio encapsulation (L16) has thus far been defined.

   Other encoding formats have already appeared, such as the 12-bit

   nonlinear, 20-bit linear and 24-bit linear encodings used in the DAT

   and DV video world.  This specification defines the...