RTP Payload for Society of Motion Picture and Television Engineers (SMPTE) ST 291-1 Ancillary Data
RFC 8331
Internet Engineering Task Force (IETF) T. Edwards
Request for Comments: 8331 FOX
Category: Standards Track February 2018
ISSN: 2070-1721
RTP Payload for
Society of Motion Picture and Television Engineers (SMPTE)
ST 291-1 Ancillary Data
Abstract
This memo describes a Real-time Transport Protocol (RTP) payload
format for the Society of Motion Picture and Television Engineers
(SMPTE) ancillary space (ANC) data, as defined by SMPTE ST 291-1.
SMPTE ANC data is generally used along with professional video
formats to carry a range of ancillary data types, including time
code, Closed Captioning, and the Active Format Description (AFD).
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 7841.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
https://www.rfc-editor.org/info/rfc8331.
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Edwards Standards Track [Page 1]
RFC 8331 RTP Payload for Ancillary Data February 2018
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Requirements Language . . . . . . . . . . . . . . . . . . 3
2. RTP Payload Format for SMPTE ST 291 Ancillary Data . . . . . 4
2.1. Payload Header Definitions . . . . . . . . . . . . . . . 5
3. Payload Format Parameters . . . . . . . . . . . . . . . . . . 11
3.1. Media Type Definition . . . . . . . . . . . . . . . . . . 11
4. SDP Considerations . . . . . . . . . . . . . . . . . . . . . 13
4.1. Grouping ANC Data Streams with Other Media Streams . . . 15
5. Offer/Answer Model and Declarative Considerations . . . . . . 15
5.1. Offer/Answer Model . . . . . . . . . . . . . . . . . . . 15
5.2. Declarative SDP Considerations . . . . . . . . . . . . . 16
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 16
7. Security Considerations . . . . . . . . . . . . . . . . . . . 16
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 17
8.1. Normative References . . . . . . . . . . . . . . . . . . 17
8.2. Informative References . . . . . . . . . . . . . . . . . 18
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 20
1. Introduction
This memo describes a Real-time Transport Protocol (RTP) payload
format for the Society of Motion Picture and Television Engineers
(SMPTE) ancillary space (ANC) data, as defined by SMPTE ST 291-1
[ST291]. ANC data is transmitted in the ancillary space of serial
digital video interfaces, the space outside of the active video
region of images intended for users to view. Ancillary space roughly
corresponds to vertical and horizontal blanking periods of cathode
ray tube type displays. ANC data can carry a range of data types,
including time code, Closed Captioning, and the Active Format
Description (AFD).
ANC data is generally associated with the carriage of metadata within
the bit stream of a Serial Digital Interface (SDI), such as the
standard definition (SD) Serial Digital Interface, the 1.5 Gb/s
Serial Digital Interface for high definition (HD) television
applications, or the 3 Gb/s Signal/Data Serial Interface (SMPTE ST
259 [ST259], SMPTE ST 292-1 [ST292], and SMPTE ST 424 [ST424]).
ANC data packet payload definitions for a specific application are
specified by a SMPTE Standard, Recommended Practice, Registered
Disclosure Document, or by a document generated by another
organization, a company, or an individual (an entity). When a
payload format is registered with SMPTE, it is identified by a
registered data identification word.
Edwards Standards Track [Page 2]
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