RTP Payload Format Restrictions
draft-ietf-mmusic-rid-15
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Active Internet-Draft (mmusic WG)
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2018-06-18
(latest revision 2018-05-15)
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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
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bibtex
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Submitted to IESG for Publication
(wg milestone:
Aug 2017 - Submit RTP Payload F...
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Document shepherd |
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Flemming Andreasen
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Shepherd write-up |
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Show
(last changed 2018-01-26)
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IESG |
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RFC Ed Queue
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Consensus Boilerplate |
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Yes
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Responsible AD |
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Ben Campbell
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Send notices to |
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"Flemming Andreasen" <fandreas@cisco.com>
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IANA |
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IANA OK - Actions Needed
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RFC-Ed-Ack
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RFC Editor |
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MISSREF |
Network Working Group A. Roach (Editor)
Internet-Draft Mozilla
Updates: 4855 (if approved) May 15, 2018
Intended status: Standards Track
Expires: November 16, 2018
RTP Payload Format Restrictions
draft-ietf-mmusic-rid-15
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" ("restriction identifier") SDP
attribute to unambiguously identify the RTP Streams within an 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 November 16, 2018.
Copyright Notice
Copyright (c) 2018 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
Roach (Editor) Expires November 16, 2018 [Page 1]
Internet-Draft RTP Restrictions May 2018
(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 . . . . . . . . . . . . . . . . . 8
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 . . . . . . . . . . . . . . . . . . 13
7. Use with Declarative SDP . . . . . . . . . . . . . . . . . . 13
8. Interaction with Other Techniques . . . . . . . . . . . . . . 13
8.1. Interaction with VP8 Format Parameters . . . . . . . . . 14
8.1.1. max-fr - Maximum Framerate . . . . . . . . . . . . . 14
8.1.2. max-fs - Maximum Framesize, in VP8 Macroblocks . . . 14
8.2. Interaction with H.264 Format Parameters . . . . . . . . 15
8.2.1. profile-level-id and max-recv-level - Negotiated Sub-
Profile . . . . . . . . . . . . . . . . . . . . . . . 16
8.2.2. max-br / MaxBR - Maximum Video Bitrate . . . . . . . 16
8.2.3. max-fs / MaxFS - Maximum Framesize, in H.264
Macroblocks . . . . . . . . . . . . . . . . . . . . . 16
8.2.4. max-mbps / MaxMBPS - Maximum Macroblock Processing
Rate . . . . . . . . . . . . . . . . . . . . . . . . 16
8.2.5. max-smbps - Maximum Decoded Picture Buffer . . . . . 17
8.3. Redundancy Formats and Payload Type Restrictions . . . . 17
9. Format Parameters for Future Payloads . . . . . . . . . . . . 18
10. Formal Grammar . . . . . . . . . . . . . . . . . . . . . . . 18
11. SDP Examples . . . . . . . . . . . . . . . . . . . . . . . . 20
11.1. Many Bundled Streams using Many Codecs . . . . . . . . . 20
11.2. Scalable Layers . . . . . . . . . . . . . . . . . . . . 22
12. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 22
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