RTP Payload Format for the iSAC Codec
draft-ietf-avt-rtp-isac-03

The information below is for an old version of the document
Document Type Active Internet-Draft (payload WG)
Last updated 2013-01-16
Replaces draft-legrand-rtp-isac
Stream IETF
Intended RFC status (None)
Formats pdf htmlized (tools) htmlized bibtex
Stream WG state In WG Last Call
Document shepherd Roni Even
IESG IESG state I-D Exists
Consensus Boilerplate Unknown
Telechat date
Responsible AD (None)
Send notices to (None)
Network Working Group                                        T. le Grand
Internet-Draft                                                    Google
Intended status: Standards Track                                P. Jones
Expires: July 20, 2013                                          P. Huart
                                                           Cisco Systems
                                                           T. Shabestary
                                                      H. Alvestrand, Ed.
                                                                  Google
                                                        January 16, 2013

                 RTP Payload Format for the iSAC Codec
                       draft-ietf-avt-rtp-isac-03

Abstract

   iSAC is a proprietary wideband speech and audio codec developed by
   Global IP Solutions (now part of Google), suitable for use in Voice
   over IP applications.  This document describes the payload format for
   iSAC generated bit streams within a Real-Time Protocol (RTP) packet.
   Also included here are the necessary details for the use of iSAC with
   the Session Description Protocol (SDP).

Requirements Language

   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 [RFC2119].

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on July 20, 2013.

Copyright Notice

le Grand, et al.          Expires July 20, 2013                 [Page 1]
Internet-Draft                    iSAC                      January 2013

   Copyright (c) 2013 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
   to this document.  Code Components extracted from this document must
   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 Simplified BSD License.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  iSAC Codec Description . . . . . . . . . . . . . . . . . . . .  3
   3.  RTP Payload Format . . . . . . . . . . . . . . . . . . . . . .  4
     3.1.  Payload Header . . . . . . . . . . . . . . . . . . . . . .  5
     3.2.  iSAC Wideband Payload Format . . . . . . . . . . . . . . .  6
       3.2.1.  Encoded Speech Data  . . . . . . . . . . . . . . . . .  6
     3.3.  iSAC Superwideband Payload Format  . . . . . . . . . . . .  7
       3.3.1.  Encoded Upper-band Speech Data . . . . . . . . . . . .  8
     3.4.  Padding  . . . . . . . . . . . . . . . . . . . . . . . . .  8
     3.5.  Multiple iSAC frames in an RTP packet  . . . . . . . . . .  9
   4.  Congestion Control . . . . . . . . . . . . . . . . . . . . . .  9
   5.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 10
   6.  Mapping to SDP Parameters  . . . . . . . . . . . . . . . . . . 12
     6.1.  Example Initial Target Bit Rate  . . . . . . . . . . . . . 12
     6.2.  Example Max Bit Rate . . . . . . . . . . . . . . . . . . . 12
     6.3.  Example with both WB and SWB offered . . . . . . . . . . . 13
   7.  Security Considerations  . . . . . . . . . . . . . . . . . . . 13
   8.  Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . 13
   9.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 14
     9.1.  Normative References . . . . . . . . . . . . . . . . . . . 14
     9.2.  Informative References . . . . . . . . . . . . . . . . . . 14
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 14

le Grand, et al.          Expires July 20, 2013                 [Page 2]
Internet-Draft                    iSAC                      January 2013

1.  Introduction

   This document gives a general description of the iSAC wideband speech
   codec and specifies the iSAC payload format for usage in RTP packets.
   Also included here are the necessary details for the use of iSAC with
Show full document text