A/V Transport Payloads Working Group T. Edwards
Internet-Draft FOX
Intended status: Standards Track October 5, 2016
Expires: April 8, 2017
RTP Payload for SMPTE ST 291 Ancillary Data
draft-ietf-payload-rtp-ancillary-06
Abstract
This memo describes an RTP Payload format for SMPTE Ancillary data,
as defined by SMPTE ST 291-1. SMPTE Ancillary 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
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This Internet-Draft will expire on April 8, 2017.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Requirements Language . . . . . . . . . . . . . . . . . . 3
2. RTP Payload Format for SMPTE ST 291 Ancillary Data . . . . . 3
2.1. Payload Header Definitions . . . . . . . . . . . . . . . 5
3. Payload Format Parameters . . . . . . . . . . . . . . . . . . 8
3.1. Media Type Definition . . . . . . . . . . . . . . . . . . 8
3.2. Mapping to SDP . . . . . . . . . . . . . . . . . . . . . 10
3.2.1. Grouping ANC data RTP Streams with Associated Video
Streams . . . . . . . . . . . . . . . . . . . . . . . 11
3.3. Offer/Answer Model and Declarative Considerations . . . . 11
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 12
5. Security Considerations . . . . . . . . . . . . . . . . . . . 12
6. References . . . . . . . . . . . . . . . . . . . . . . . . . 12
6.1. Normative References . . . . . . . . . . . . . . . . . . 13
6.2. Informative References . . . . . . . . . . . . . . . . . 14
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 15
1. Introduction
This memo describes an RTP Payload format for the Society of Motion
Picture and Television Engineers (SMPTE) Ancillary data (ANC), 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 required by cathode ray tube type displays. ANC can
carry a range of data types, including time code, Closed Captioning,
and the Active Format Description (AFD).
ANC is generally associated with the carriage of metadata within the
bit stream of a Serial Digital Interface (SDI) such as SMPTE ST 259
[ST259], the standard definition (SD) Serial Digital Interface (with
ANC data inserted as per SMPTE ST 125 [ST125]), or SMPTE ST 292-1
[ST292], the 1.5 Gb/s Serial Digital Interface for high definition
(HD) television applications.
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, an application document
describing the payload format is required, and the registered
ancillary data packet is identified by a registered data
identification word.
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This memo describes an RTP payload that supports ANC data packets
regardless of whether they originate from an SD or HD interface, or
if the ANC data packet is from the vertical ancillary space (VANC) or
the horizontal ancillary space (HANC), or if the ANC packet is
located in the luma (Y) or color-difference (C) channel. Sufficient
information is provided to enable the ANC data packets at the output
of the decoder to be restored to their original locations in the
serial digital video signal raster (if that is desired). Optional
Media Type parameters allow for signaling of carriage of one or more
types of ANC data as specified by Data Identification (DID) or
Secondary Data Identification (SDID) words.
It should be noted that the ancillary data flag (ADF) word is not
specifically carried in this RTP payload. The ADF may be specified
in a document defining an interconnecting digital video interface,
otherwise a default ADF is specified by SMPTE ST 291-1 [ST291].
This ANC payload can be used by itself, or used along with a range of
RTP video formats. In particular, it has been designed so that it
could be used along with RFC 4175 [RFC4175] "RTP Payload Format for
Uncompressed Video" or RFC 5371 [RFC5371] "RTP Payload Format for
JPEG 2000 Video Streams."
The data model in this document for the ANC data RTP payload is based
on the data model of SMPTE ST 2038 [ST2038], which standardizes the
carriage of ANC data packets in an MPEG-2 Transport Stream.
1.1. 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].
2. RTP Payload Format for SMPTE ST 291 Ancillary Data
The format of an RTP packet containing SMPTE ST 291 Ancillary Data is
shown below:
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0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|V=2|P|X| CC |M| PT | sequence number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| timestamp |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| synchronization source (SSRC) identifier |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Extended Sequence Number | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ANC_Count |C| Line_Number | Horizontal_Offset |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| DID | SDID | Data_Count | R |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| User_Data_Words...
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Checksum_Word | word_align |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| (next ANC data packet)...
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 1: SMPTE Ancillary Data RTP Packet Format
RTP packet header fields SHALL be interpreted as per RFC 3550
[RFC3550], with the following specifics:
Timestamp: 32 bits
The timestamp field is interpreted in a similar fashion to
RFC 4175 [RFC4175]:
For progressive scan video, the timestamp denotes the
sampling instant of the frame to which the ancillary data in
the RTP packet belongs. RTP packets MUST NOT include ANC
data from multiple frames, and all RTP packets with ANC data
belonging to the same frame MUST have the same timestamp.
For interlaced video, the timestamp denotes the sampling
instant of the field to which the ancillary data in the RTP
packet belongs. RTP packets MUST NOT include ANC data from
multiple fields, and all RTP packets belonging to the same
field MUST have the same timestamp.
If the sampling instant does not correspond to an integer
value of the clock, the value SHALL be truncated to the next
lowest integer, with no ambiguity. Section 3.1 describes
recommended timestamp clock rates.
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Marker bit (M): 1 bit
The marker bit set to "1" indicates the last ANC RTP packet
for a frame (for progressive scan video) or the last ANC RTP
packet for a field (for interlaced video).
2.1. Payload Header Definitions
The ANC RTP payload header fields are defined as:
Extended Sequence Number: 16 bits
The high order bits of the extended 32-bit sequence number,
in network byte order. This is the same as the Extended
Sequence Number field in RFC 4175 [RFC4175].
Length: 16 bits
Number of octets of the ANC RTP payload, beginning with the
"C" bit of the first ANC packet data, as an unsigned integer
in network byte order.
ANC_Count: 8 bits
This field is the count of the total number of ANC data
packets carried in the RTP payload, as an unsigned integer in
network byte order. A single ANC RTP packet payload cannot
carry more than 255 ANC data packets.
If more than 255 ANC data packets need to be carried in a
field or frame, additional RTP packets carrying ANC data MAY
be sent with the same RTP timestamp but with different
sequence numbers. ANC_Count of 0 indicates that there are no
ANC data packets in the payload (for example, for an RTP
packet with the marker bit set indicating the last ANC RTP
packet in a field/frame, even if that RTP packet carries no
actual ANC data packets.)
For each ANC data packet in the payload, the following ANC data
packet header fields MUST be present:
C: 1 bit
For HD signals, this flag, when set to "1", indicates that
the ANC data corresponds to the color-difference channel (C).
When set to "0", this flag indicates that the ANC data
corresponds to the luma (Y) channel. For SD signals, this
flag SHALL be set to "0".
Line_Number: 11 bits
This field contains the line number (as defined in ITU-R
BT.1700 [BT1700] for SD video or ITU-R BT.1120 [BT1120] for
HD video) that corresponds to the location of the ANC data
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packet in an SDI raster as an unsigned integer in network
byte order. A value of 0x7FF (all bits in the field are '1')
SHALL indicate that the ANC data is carried without a
specific line location within the field or frame.
Note that the lines that are available to convey ANC data are
as defined in the applicable sample structure specification
(e.g., SMPTE 274M [ST274], SMPTE ST 296 [ST296], ITU-R BT.656
[BT656]) and may be further restricted per SMPTE RP 168
[RP168].
Horizontal_Offset: 12 bits
This field defines the location of the ANC data packet in an
SDI raster relative to the start of active video (SAV) as an
unsigned integer in network byte order. A value of 0 means
that that within the original SDI signal, the Ancillary Data
Flag (ADF) of the ANC data packet begins immediately
following SAV. For HD, this is in units of luma sample
numbers as specified by the defining document of the
particular image (e.g., SMPTE 274M [ST274] for 1920 x 1080
active images, or SMPTE ST 296 [ST296] for 1280 x 720
progressive active images). For SD, this is in units of
(27MHz) multiplexed word numbers, as specified in SMPTE ST
125 [ST125]. A value of 0xFFF (all bits in the field are
'1') indicates that the ANC data is carried without any
specific location within the line.
Note that HANC space in the digital blanking area will
generally have higher luma sample numbers than any samples in
the active digital line.
An ANC data packet with the header fields Line_Number of 0x7FF and
Horizontal_Offset of 0xFFF SHALL be considered to be carried without
any specific location within the field or frame, and in such a case
the "C" field SHALL be ignored.
For each ANC data packet in the payload, immediately after the ANC
data packet header fields, the following data fields MUST be present,
with the fields DID, SDID, Data_Count, User_Data_Words, and
Checksum_Word representing the 10-bit words carried in the ANC data
packet, as per SMPTE ST 291-1 [ST291]:
DID: 10 bits
Data Identification Word
SDID: 10 bits
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Secondary Data Identification Word. Used only for a "Type 2"
ANC data packet. Note that in a "Type 1" ANC data packet,
this word will actually carry the Data Block Number (DBN).
Data_Count: 10 bits
The lower 8 bits of Data_Count, corresponding to bits b7
(MSB) through b0 (LSB) of the 10-bit Data_Count word, contain
the actual count of 10-bit words in User_Data_Words. Bit b8
is the even parity for bits b7 through b0, and bit b9 is the
inverse (logical NOT) of bit b8.
R: 2 reserved bits
R is a field of two reserved bits that MUST be set to zero.
User_Data_Words: integer number of 10 bit words
User_Data_Words (UDW) are used to convey information of a
type as identified by the DID word or the DID and SDID words.
The number of 10-bit words in the UDW is defined by the
Data_Count field.
Checksum_Word: 10 bits
The Checksum_Word can be used to determine the validity of
the ANC data packet from the DID word through the UDW. It
consists of 10 bits, where bits b8 (MSB) through b0 (LSB)
define the checksum value and bit b9 is the inverse (logical
NOT) of bit b8. The checksum value is equal to the nine
least significant bits of the sum of the nine least
significant bits of the DID word, the SDID word, the
Data_Count word, and all User_Data_Words in the ANC data
packet. The checksum is initialized to zero before
calculation, and any end carry resulting from the checksum
calculation is ignored.
word_align: bits as needed to complete 32-bit word
Word align contains enough "0" bits as needed to complete the
last 32-bit word of ANC packet's data in the RTP payload. If
an ANC data packet in the RTP payload ends aligned with a
word boundary, there is no need to add any word alignment
bits. Word align should be used even for the last ANC data
packet in an RTP packet.
When reconstructing an SDI signal based on this payload, it is
important to place ANC data packets into the locations indicated by
the ANC payload header fields Line_Number and Horizontal_Offset, and
also to follow the requirements of SMPTE ST 291-1 [ST291] Section 7
"Ancillary Data Space Formatting (Component or Composite Interface)",
which include rules on the placement of initial ANC data into allowed
spaces as well as the contiguity of ANC data packet sequences within
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those spaces in order to assure that the resulting ANC data packets
in the SDI signal are valid.
Senders of this payload SHOULD transmit available ANC data packets as
soon as practical to reduce end-to-end latency, especially if
receivers will be embedding the received ANC data packet into an SDI
signal emission. One millisecond is a reasonable upper bound for the
amount of time between when an ANC data packet becomes available to a
sender and the emission of an RTP payload containing that ANC data
packet.
ANC data packets with headers that specify specific location within a
field or frame SHOULD be sent in raster scan order, both in terms of
packing position within an RTP packet and in terms of transmission
time of RTP packets.
3. Payload Format Parameters
This RTP payload format is identified using the video/smpte291 media
type, which is registered in accordance with RFC 4855 [RFC4855], and
using the template of RFC 6838 [RFC6838].
Note that the Media Type Definition is in the "video" tree due to the
expected use of SMPTE ST 291 Ancillary Data along with video formats.
3.1. Media Type Definition
Type name: video
Subtype name: smpte291
Required parameters:
Rate: RTP timestamp clock rate. When an ANC RTP stream is to be
associated with an RTP video stream, the RTP timestamp rates
SHOULD be the same to ensure that ANC data packets can be
associated with the appropriate frame or field. Otherwise, a 90
kHz rate SHOULD be used.
Note that techniques described in RFC 7273 [RFC7273] can provide a
common reference clock for multiple RTP streams intended for
synchronized presentation.
Optional parameters:
DID_SDID: Data identification and Secondary data identification
words.
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The presence of the DID_SDID parameters signals that all ancillary
data packets of this stream are of a particular type or types,
i.e., labeled with a particular DIDs and SDIDs. DID and SDID
values of SMPTE Registered ANC packet types can be found on the at
the SMPTE Registry for Data Identification Word Assignments
[SMPTE-RA] web site.
"Type 1" ANC packets (which do not have SDIDs defined) SHALL be
labeled with SDID=0x00.
DID and SDID values can be registered with SMPTE as per SMPTE ST
291-1 [ST291].
Encoding considerations: This media type is framed and binary; see
Section 4.8 of RFC 6838 [RFC6838].
Security considerations: See Section 5 of [this RFC]
Interoperability considerations: Data items in smpte291 can be very
diverse. Receivers might only be capable of interpreting a subset of
the possible data items. Some implementations may care about the
location of the ANC data packets in the SDI raster, but other
implementations may not care.
Published specification: [this RFC]
Applications that use this media type: Devices that stream real-time
professional video, especially those that must interoperate with
legacy serial digital interfaces (SDI).
Additional Information:
Deprecated alias names for this type: N/A
Magic number(s): N/A
File extension(s): N/A
Macintosh file type code(s): N/A
Person & email address to contact for further information: T.
Edwards <thomas.edwards@fox.com>, IETF Payload Working Group
<payload@ietf.org>
Intended usage: COMMON
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Restrictions on usage: This media type depends on RTP framing, and
hence is only defined for transfer via RTP RFC 3550 [RFC3550].
Transport within other framing protocols is not defined at this time.
Author: T. Edwards <thomas.edwards@fox.com>
Change controller: The IETF PAYLOAD working group, or other party as
designated by the IESG.
3.2. Mapping to SDP
The mapping of the above defined payload format media type and its
parameters SHALL be done according to Section 3 of RFC 4855
[RFC4855].
o The type name ("video") goes in SDP "m=" as the media name.
o The subtype name ("smpte291") goes in SDP "a=rtpmap" as the
encoding name, followed by a slash ("/") and the required rate
parameter.
o The optional DID_SDID parameters go in the SDP "a=fmtp" attribute
as a semicolon-separated list of parameter=value pairs.
DID and SDID values SHALL be specified in hexadecimal with a "0x"
prefix (such as "0x61"). The ABNF as per RFC 5234 [RFC5234] of the
fmtp line shall be:
TwoHex = "0x" 1*2(HEXDIG)
DidSdid = "DID_SDID={" TwoHex "," TwoHex "}"
FormatSpecificParameters = DidSdid *(";" DidSdid)
For example, EIA 608 Closed Caption data would be signalled with the
parameter DID_SDID={0x61,0x02}. If a DID_SDID parameter is not
specified, then the ancillary data stream may potentially contain
ancillary data packets of any type.
Multiple DID_SDID parameters may be specified (separated by
semicolons) to signal the presence of multiple types of ANC data in
the stream. DID_SDID={0x61,0x02};DID_SDID={0x41,0x05}, for example,
signals the presence of EIA 608 Closed Captions as well as AFD/Bar
Data.
A sample SDP mapping for ancillary data is as follows:
m=video 30000 RTP/AVP 112
a=rtpmap:112 smpte291/90000
a=fmtp:112 DID_SDID={0x61,0x02};DID_SDID={0x41,0x05}
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In this example, a dynamic payload type 112 is used for ancillary
data. The 90 kHz RTP timestamp rate is specified in the "a=rtpmap"
line after the subtype. The RTP sampling clock is 90 kHz. In the
"a=fmtp:" line, DID 0x61 and SDID 0x02 are specified (registered to
EIA 608 Closed Caption Data by SMPTE), and also DID 0x41 and SDID
0x05 (registered to AFD/Bar Data).
3.2.1. Grouping ANC data RTP Streams with Associated Video Streams
The ANC RTP payload format will often be used in groupings with
associated video streams. Any legal SDP grouping mechanism could be
used. Implementers may wish to use the Lip Synchronization (LS)
grouping defined in RFC 5888 [RFC5888], which requires that "m" lines
that are grouped together using LS semantics MUST synchronize the
playout of the corresponding media streams.
A sample SDP mapping for grouping ANC data with RFC 4175 video using
LS semantics is as follows:
v=0
o=Al 123456 11 IN IP4 host.example.com
s=Professional Networked Media Test
i=A test of synchronized video and ANC data
t=0 0
a=group:LS V1 M1
m=video 50000 RTP/AVP 96
c=IN IP4 233.252.0.1/255
a=rtpmap:96 raw/90000
a=fmtp:96 sampling=YCbCr-4:2:2; width=1280; height=720; depth=10
a=mid:V1
m=video 50010 RTP/AVP 97
c=IN IP4 233.252.0.2/255
a=rtpmap:97 smpte291/90000
a=fmtp:97 DID_SDID={0x61,0x02};DID_SDID={0x41,0x05}
a=mid:M1
3.3. Offer/Answer Model and Declarative Considerations
Receivers may with to receive ANC data streams with specific DID_SDID
parameters. Thus when offering ANC data streams using the Session
Description Protocol (SDP) in an Offer/Answer model [RFC3264] or in a
declarative manner (e.g., SDP in the Real-Time Streaming Protocol
(RTSP) [RFC2326] or the Session Announcement Protocol (SAP)
[RFC2974]), the offerer may provide a list of ANC streams available
with specific DID_SDID parameters in the fmtp line. The answerer may
respond with a all or a subset of the streams offered along with fmtp
lines with all or a subset of the DID_SDID parameters offered. Or
the answerer may reject the offer.
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4. IANA Considerations
One media type (video/smpte291) has been defined and needs
registration in the media types registry. See Section 3.1
5. Security Considerations
RTP packets using the payload format defined in this specification
are subject to the security considerations discussed in the RTP
specification [RFC3550], and in any applicable RTP profile such as
RTP/AVP [RFC3551], RTP/AVPF [RFC4585] RTP/SAVP [RFC3711] or RTP/SAVPF
[RFC5124]. However, as "Securing the RTP Protocol Framework: Why RTP
Does Not Mandate a Single Media Security Solution" [RFC7202]
discusses, it is not an RTP payload format's responsibility to
discuss or mandate what solutions are used to meet the basic security
goals like confidentiality, integrity and source authenticity for RTP
in general. This responsibility lays on anyone using RTP in an
application. They can find guidance on available security mechanisms
and important considerations in Options for Securing RTP Sessions
[RFC7201]. Applications SHOULD use one or more appropriate strong
security mechanisms. The rest of this security consideration section
discusses the security impacting properties of the payload format
itself.
To avoid potential buffer overflow attacks, receivers should take
care to validate that the ANC data packets in the RTP payload are of
the appropriate length (using the Data_Count field) for the ANC data
type specified by DID & SDID. Also the Checksum_Word should be
checked against the ANC data packet to ensure that its data has not
been damaged in transit.
Some receivers will simply move the ANC data packet bits from the RTP
payload into a serial digital interface (SDI). It may still be a
good idea for these "re-embedders" to perform the above mentioned
validity tests to avoid downstream SDI systems from becoming confused
by bad ANC data packets, which could be used for a denial of service
attack.
"Re-embedders" into SDI should also double check that the Line_Number
and Horizontal_Offset leads to the ANC data packet being inserted
into a legal area to carry ancillary data in the SDI video bit stream
of the output video format.
6. References
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6.1. Normative References
[BT1120] ITU-R, "BT.1120-8, Digital Interfaces for HDTV Studio
Signals", January 2012.
[BT1700] ITU-R, "BT.1700, Characteristics of Composite Video
Signals for Conventional Analogue Television Systems",
February 2005.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<http://www.rfc-editor.org/info/rfc2119>.
[RFC3264] Rosenberg, J. and H. Schulzrinne, "An Offer/Answer Model
with Session Description Protocol (SDP)", RFC 3264,
DOI 10.17487/RFC3264, June 2002,
<http://www.rfc-editor.org/info/rfc3264>.
[RFC3550] Schulzrinne, H., Casner, S., Frederick, R., and V.
Jacobson, "RTP: A Transport Protocol for Real-Time
Applications", STD 64, RFC 3550, DOI 10.17487/RFC3550,
July 2003, <http://www.rfc-editor.org/info/rfc3550>.
[RFC3551] Schulzrinne, H. and S. Casner, "RTP Profile for Audio and
Video Conferences with Minimal Control", STD 65, RFC 3551,
DOI 10.17487/RFC3551, July 2003,
<http://www.rfc-editor.org/info/rfc3551>.
[RFC3711] Baugher, M., McGrew, D., Naslund, M., Carrara, E., and K.
Norrman, "The Secure Real-time Transport Protocol (SRTP)",
RFC 3711, DOI 10.17487/RFC3711, March 2004,
<http://www.rfc-editor.org/info/rfc3711>.
[RFC4585] Ott, J., Wenger, S., Sato, N., Burmeister, C., and J. Rey,
"Extended RTP Profile for Real-time Transport Control
Protocol (RTCP)-Based Feedback (RTP/AVPF)", RFC 4585,
DOI 10.17487/RFC4585, July 2006,
<http://www.rfc-editor.org/info/rfc4585>.
[RFC4855] Casner, S., "Media Type Registration of RTP Payload
Formats", RFC 4855, DOI 10.17487/RFC4855, February 2007,
<http://www.rfc-editor.org/info/rfc4855>.
[RFC5124] Ott, J. and E. Carrara, "Extended Secure RTP Profile for
Real-time Transport Control Protocol (RTCP)-Based Feedback
(RTP/SAVPF)", RFC 5124, DOI 10.17487/RFC5124, February
2008, <http://www.rfc-editor.org/info/rfc5124>.
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[RFC5234] Crocker, D., Ed. and P. Overell, "Augmented BNF for Syntax
Specifications: ABNF", STD 68, RFC 5234,
DOI 10.17487/RFC5234, January 2008,
<http://www.rfc-editor.org/info/rfc5234>.
[RFC5888] Camarillo, G. and H. Schulzrinne, "The Session Description
Protocol (SDP) Grouping Framework", RFC 5888,
DOI 10.17487/RFC5888, June 2010,
<http://www.rfc-editor.org/info/rfc5888>.
[RFC6838] Freed, N., Klensin, J., and T. Hansen, "Media Type
Specifications and Registration Procedures", BCP 13,
RFC 6838, DOI 10.17487/RFC6838, January 2013,
<http://www.rfc-editor.org/info/rfc6838>.
[ST291] SMPTE, "ST 291-1:2011, Ancillary Data Packet and Space
Formatting", 2011.
6.2. Informative References
[BT656] ITU-R, "BT.656-5, Interfaces for Digital Component Video
Signals in 525-Line and 625-Line Television Systems
Operating at the 4:2:2 Level of Recommendation ITU-R
BT.601", December 2007.
[RFC2326] Schulzrinne, H., Rao, A., and R. Lanphier, "Real Time
Streaming Protocol (RTSP)", RFC 2326,
DOI 10.17487/RFC2326, April 1998,
<http://www.rfc-editor.org/info/rfc2326>.
[RFC2974] Handley, M., Perkins, C., and E. Whelan, "Session
Announcement Protocol", RFC 2974, DOI 10.17487/RFC2974,
October 2000, <http://www.rfc-editor.org/info/rfc2974>.
[RFC4175] Gharai, L. and C. Perkins, "RTP Payload Format for
Uncompressed Video", RFC 4175, DOI 10.17487/RFC4175,
September 2005, <http://www.rfc-editor.org/info/rfc4175>.
[RFC5371] Futemma, S., Itakura, E., and A. Leung, "RTP Payload
Format for JPEG 2000 Video Streams", RFC 5371,
DOI 10.17487/RFC5371, October 2008,
<http://www.rfc-editor.org/info/rfc5371>.
[RFC7201] Westerlund, M. and C. Perkins, "Options for Securing RTP
Sessions", RFC 7201, DOI 10.17487/RFC7201, April 2014,
<http://www.rfc-editor.org/info/rfc7201>.
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Internet-Draft RTP Payload for Ancillary Data October 2016
[RFC7202] Perkins, C. and M. Westerlund, "Securing the RTP
Framework: Why RTP Does Not Mandate a Single Media
Security Solution", RFC 7202, DOI 10.17487/RFC7202, April
2014, <http://www.rfc-editor.org/info/rfc7202>.
[RFC7273] Williams, A., Gross, K., van Brandenburg, R., and H.
Stokking, "RTP Clock Source Signalling", RFC 7273,
DOI 10.17487/RFC7273, June 2014,
<http://www.rfc-editor.org/info/rfc7273>.
[RP168] SMPTE, "RP 168:2009, Definition of Vertical Interval
Switching Point for Synchronous Video Switching", 2009.
[SMPTE-RA]
SMPTE Registration Authority, LLC, "SMPTE ST 291 Ancillary
Data Identification Word Assignments for Registered DIDs",
2011, <http://www.smpte-ra.org/
smpte-ancillary-data-smpte-st-291>.
[ST125] SMPTE, "ST 125:2013, SDTV Component Video Signal Coding
4:4:4 and 4:2:2 for 13.5 MHz and 18 MHz Systems", 2013.
[ST2038] SMPTE, "ST 2038:2008, Carriage of Ancillary Data Packets
in an MPEG-2 Transport Stream", 2008.
[ST259] SMPTE, "ST 259:2008, SDTV Digital Signal/Data - Serial
Digital Interface", 2008.
[ST274] SMPTE, "ST 274:2008, 1920 x 1080 Image Sample Structure,
Digital Representation and Digital Timing Reference
Sequences for Multiple Picture Rates", 2008.
[ST292] SMPTE, "ST 292-1:2012, 1.5 Gb/s Signal/Data Serial
Interface", 2012.
[ST296] SMPTE, "ST 296:2012, 1280 x 720 Progressive Image 4:2:2
and 4:4:4 Sample Structure - Analog and Digital
Representation and Analog Interface", 2012.
Author's Address
Edwards Expires April 8, 2017 [Page 15]
Internet-Draft RTP Payload for Ancillary Data October 2016
Thomas G. Edwards
FOX
10201 W. Pico Blvd.
Los Angeles, CA 90035
USA
Phone: +1 310 369 6696
Email: thomas.edwards@fox.com
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