RTP Payload Format Restrictions
draft-ietf-mmusic-rid-11
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Active Internet-Draft (mmusic WG)
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Last updated |
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2017-07-28
(latest revision 2017-07-19)
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draft-pthatcher-mmusic-rid
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IETF
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Intended RFC status |
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Proposed Standard
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plain text
pdf
html
bibtex
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WG state
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WG Consensus: Waiting for Write-Up
(wg milestone:
Aug 2017 - Submit RTP Payload F...
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Revised I-D Needed - Issue raised by WG
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Document shepherd |
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Flemming Andreasen
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IESG state |
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I-D Exists
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Consensus Boilerplate |
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Yes
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Responsible AD |
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(None)
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Send notices to |
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"Flemming Andreasen" <fandreas@cisco.com>
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Network Working Group P. Thatcher
Internet-Draft Google
Updates: 4855 (if approved) M. Zanaty
Intended status: Standards Track S. Nandakumar
Expires: January 20, 2018 Cisco Systems
B. Burman
Ericsson
A. Roach
B. Campen
Mozilla
July 19, 2017
RTP Payload Format Restrictions
draft-ietf-mmusic-rid-11
Abstract
In this specification, we define a framework for specifying
restrictions on RTP streams in the Session Description Protocol.
This framework defines a new "rid" SDP attribute to unambiguously
identify the RTP Streams within a RTP Session and restrict the
streams' payload format parameters in a codec-agnostic way beyond
what is provided with the regular Payload Types.
This specification updates RFC4855 to give additional guidance on
choice of Format Parameter (fmtp) names, and on their relation to the
restrictions defined by this document.
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 January 20, 2018.
Thatcher, et al. Expires January 20, 2018 [Page 1]
Internet-Draft RTP Restrictions July 2017
Copyright Notice
Copyright (c) 2017 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. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Key Words for Requirements . . . . . . . . . . . . . . . . . 4
4. SDP "a=rid" Media Level Attribute . . . . . . . . . . . . . . 4
5. "a=rid" restrictions . . . . . . . . . . . . . . . . . . . . 6
6. SDP Offer/Answer Procedures . . . . . . . . . . . . . . . . . 7
6.1. Generating the Initial SDP Offer . . . . . . . . . . . . 8
6.2. Answerer processing the SDP Offer . . . . . . . . . . . . 9
6.2.1. "a=rid"-unaware Answerer . . . . . . . . . . . . . . 9
6.2.2. "a=rid"-aware Answerer . . . . . . . . . . . . . . . 9
6.3. Generating the SDP Answer . . . . . . . . . . . . . . . . 10
6.4. Offerer Processing of the SDP Answer . . . . . . . . . . 11
6.5. Modifying the Session . . . . . . . . . . . . . . . . . . 12
7. Use with Declarative SDP . . . . . . . . . . . . . . . . . . 12
8. Interaction with Other Techniques . . . . . . . . . . . . . . 12
8.1. Interaction with VP8 Format Parameters . . . . . . . . . 13
8.1.1. max-fr - Maximum Framerate . . . . . . . . . . . . . 13
8.1.2. max-fs - Maximum Framesize, in VP8 Macroblocks . . . 14
8.2. Interaction with H.264 Format Parameters . . . . . . . . 14
8.2.1. profile-level-id and max-recv-level - Negotiated Sub-
Profile . . . . . . . . . . . . . . . . . . . . . . . 15
8.2.2. max-br / MaxBR - Maximum Video Bitrate . . . . . . . 15
8.2.3. max-fs / MaxFS - Maximum Framesize, in H.264
Macroblocks . . . . . . . . . . . . . . . . . . . . . 16
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