draft-ietf-avtcore-clksrc-08.txt   draft-ietf-avtcore-clksrc-09.txt 
Audio/Video Transport Core Maintenance A. Williams Audio/Video Transport Core Maintenance A. Williams
Internet-Draft Audinate Internet-Draft Audinate
Intended status: Standards Track K. Gross Intended status: Standards Track K. Gross
Expires: May 31, 2014 AVA Networks Expires: June 9, 2014 AVA Networks
R. van Brandenburg R. van Brandenburg
H. Stokking H. Stokking
TNO TNO
Novemeber 27, 2013 December 6, 2013
RTP Clock Source Signalling RTP Clock Source Signalling
draft-ietf-avtcore-clksrc-08 draft-ietf-avtcore-clksrc-09
Abstract Abstract
NTP format timestamps are used by several RTP protocols for NTP format timestamps are used by several RTP protocols for
synchronisation and statistical measurements. This memo specifies synchronisation and statistical measurements. This memo specifies
SDP signalling identifying timestamp reference clock sources and SDP SDP signalling identifying timestamp reference clock sources and SDP
signalling identifying the media clock sources in a multimedia signalling identifying the media clock sources in a multimedia
session. session.
Requirements Language Requirements Language
skipping to change at page 1, line 44 skipping to change at page 1, line 44
Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet- working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/. Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
This Internet-Draft will expire on May 31, 2014. This Internet-Draft will expire on June 9, 2014.
Copyright Notice Copyright Notice
Copyright (c) 2013 IETF Trust and the persons identified as the Copyright (c) 2013 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of (http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents publication of this document. Please review these documents
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hostport = <See RFC 3261, with revisions from RFC 5954> hostport = <See RFC 3261, with revisions from RFC 5954>
timestamp-refclk = "ts-refclk:" clksrc CRLF timestamp-refclk = "ts-refclk:" clksrc CRLF
clksrc = ntp / ptp / gps / gal / local / private / clksrc-ext clksrc = ntp / ptp / gps / gal / local / private / clksrc-ext
clksrc-ext = clksrc-param-name clksrc-param-value clksrc-ext = clksrc-param-name clksrc-param-value
clksrc-param-name = token clksrc-param-name = token
clksrc-param-value = ["=" byte-string ] clksrc-param-value = ["=" byte-string ]
ntp = "ntp=" ntp-server-addr ntp = "ntp=" ntp-server-addr
ntp-server-addr = hostport / "traceable" ntp-server-addr = hostport / "/traceable/"
ptp = "ptp=" ptp-version ":" ptp-server ptp = "ptp=" ptp-version ":" ptp-server
ptp-version = "IEEE1588-2002" ptp-version = "IEEE1588-2002"
/ "IEEE1588-2008" / "IEEE1588-2008"
/ "IEEE802.1AS-2011" / "IEEE802.1AS-2011"
/ ptp-version-ext / ptp-version-ext
ptp-version-ext = token ptp-version-ext = token
ptp-server = ptp-gmid [":" ptp-domain] ptp-server = ptp-gmid [":" ptp-domain]
/ "traceable" / "traceable"
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v=0 v=0
o=jdoe 2890844526 2890842807 IN IP4 192.0.2.1 o=jdoe 2890844526 2890842807 IN IP4 192.0.2.1
s=SDP Seminar s=SDP Seminar
i=A Seminar on the session description protocol i=A Seminar on the session description protocol
u=http://www.example.com/seminars/sdp.pdf u=http://www.example.com/seminars/sdp.pdf
e=j.doe@example.com (Jane Doe) e=j.doe@example.com (Jane Doe)
c=IN IP4 233.252.0.1/64 c=IN IP4 233.252.0.1/64
t=2873397496 2873404696 t=2873397496 2873404696
a=recvonly a=recvonly
a=ts-refclk:ntp=traceable a=ts-refclk:ntp=/traceable/
m=audio 49170 RTP/AVP 0 m=audio 49170 RTP/AVP 0
m=video 51372 RTP/AVP 99 m=video 51372 RTP/AVP 99
a=rtpmap:99 h263-1998/90000 a=rtpmap:99 h263-1998/90000
Figure 2: Timestamp reference clock definition at the session level Figure 2: Timestamp reference clock definition at the session level
Figure 3 shows an example SDP description with timestamp reference Figure 3 shows an example SDP description with timestamp reference
clock definitions at the media level overriding the session level clock definitions at the media level overriding the session level
defaults. defaults.
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