RTCP XR Report Block for TS Decodability Statistics Metric Reporting
draft-huang-xrblock-rtcp-xr-decodability-02
The information below is for an old version of the document.
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|---|---|---|---|
| Authors | Rachel Huang , Qin Wu , Hitoshi Asaeda , Glen Zorn | ||
| Last updated | 2012-02-14 (Latest revision 2011-08-17) | ||
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draft-huang-xrblock-rtcp-xr-decodability-02
Network Working Group R. Huang
Internet-Draft Q. Wu
Intended status: Standards Track Huawei
Expires: August 17, 2012 H. Asaeda
Keio University
G. Zorn, Ed.
Network Zen
February 14, 2012
RTCP XR Report Block for TS Decodability Statistics Metric Reporting
draft-huang-xrblock-rtcp-xr-decodability-02
Abstract
Transport Stream is a standard container format used in the
transmission and storage of multimedia data. This document defines
an RTCP XR Report Block that allows the reporting of decodability
statistics metrics related to transmissions in Transport Stream
format.
Status of this Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
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This Internet-Draft will expire on August 17, 2012.
Copyright Notice
Copyright (c) 2012 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
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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. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1. Standards Language . . . . . . . . . . . . . . . . . . . . 3
2.2. Acronyms . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. TR 101 290 Decodability Statistics Metric Report Block . . . . 3
4. SDP Signaling . . . . . . . . . . . . . . . . . . . . . . . . . 6
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 6
6. Security Considerations . . . . . . . . . . . . . . . . . . . . 7
7. References . . . . . . . . . . . . . . . . . . . . . . . . . . 7
7.1. Normative References . . . . . . . . . . . . . . . . . . . 7
7.2. Informative References . . . . . . . . . . . . . . . . . . 7
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 8
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1. Introduction
This draft defines a new block type to augment those defined in
[RFC3611] for use with Transport Stream (TS) [ISO-IEC.13818-1.2007].
The new block type supports reporting on the consistency of transport
streams [ETSI] by checking TS header information. This new block
type can be useful for identifying the existence, and characterizing
the severity, of a packet transport problem which may affect users'
perception of a service delivered over RTP; it may also be useful for
verifying the continued correct operation of an existing system
management and providing accurate measures of TS quality for
operators.
The new report block is in compliance with the monitoring
architecture specified in [RFC6390]. The metric is applicable to any
type of RTP application that uses the TS standard format for
transmission and storage of multimedia data.
2. Terminology
2.1. Standards 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].
In addition, the following terms are defined:
2.2. Acronyms
SSRC
Synchronization Source [RFC3550]
TS
Transport Stream [ISO-IEC.13818-1.2007]
3. TR 101 290 Decodability Statistics Metric Report Block
This block reports decodability statistics metrics beyond the
information carried in the standard RTCP packet format. Information
is recorded about basic monitoring parameters necessary to ensure
that the TS can be decoded including the number of Transport Stream
Synchronization Losses, Sync byte errors, Continuity count errors,
and continuous monitoring parameters including Transport errors,
Program Clock Reference (PCR) errors, PCR repetition errors, PCR
discontinuity indicator errors, and Presentation Time Stamp (PTS)
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errors [ETSI]. Such information can be useful for network management
and real time application quality monitoring.
Note that this metric report block is not only applicable to MPEG-2
transport streams [RFC2250], but is also applicable to any other
codec data encoded using the TS format.
The Decodability Metrics Block has the following format:
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| BT=TBD | rvd | block length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SSRC of source |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| begin_seq | end_seq |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Number of TSs |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Transport Stream Synchronization Losses |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Sync byte errors |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Continuity count errors |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Transport errors |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| PCR errors |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| PCR repetition errors |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| PCR discontinuity indicator errors |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| PTS errors |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
block type (BT): 8 bits
A TR 101 290 decodability metrics report block is identified by
the constant <TDM>.
rvd: 8 bits
This field is reserved for future definition. In the absence of
such a definition, the bits in this field MUST be set to zero and
SHOULD be ignored by the receiver.
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block length: 16 bits
The constant 11, in accordance with the definition of this field
in Section 3 of RFC 3611 [RFC3611].
SSRC of source: 32 bits
As defined in Section 4.1 of [RFC3611].
begin_seq: 16 bits
As defined in Section 4.1 of [RFC3611].
end_seq: 16 bits
As defined in Section 4.1 of [RFC3611].
Number of TSs: 32 bits
Number of Transport Streams in the above sequence number interval.
Transport Stream Synchronization Losses: 32 bits
Number of TS Synchronization Losses in the above sequence number
interval.
Sync byte errors: 32 bits
Number of TS sync byte errors in the above sequence number
interval.
Continuity count error: 32 bits
Number of Transport Continuity count errors in the above sequence
number interval.
Transport errors: 32 bits
Number of Transport errors in the above sequence number interval.
PCR errors: 32 bits
Number of PCR errors in the above sequence number interval.
PCR repetition errors: 32 bits
Number of Transport PCR repetition errors in the above sequence
number interval.
PCR discontinuity indicator errors: 32 bits
Number of PCR discontinuity indicator errors in the above sequence
number interval.
PTS errors: 32 bits
Number of PTS errors in the above sequence number interval.
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4. SDP Signaling
One new parameter is defined for the report block defined in this
document to be used with Session Description Protocol (SDP) [RFC4566]
using the Augmented Backus-Naur Form (ABNF) [RFC5234]. It has the
following syntax within the "rtcp-xr" attribute [RFC3611]:
rtcp-xr-attrib = "a=rtcp-xr:"
[xr-format *(SP xr-format)] CRLF
xr-format = decodability-metrics
decodability-metrics = "decodability-metrics"
Refer to Section 5.1 of RFC 3611 [RFC3611] for a detailed description
and the full syntax of the "rtcp-xr" attribute.
5. IANA Considerations
New report block types for RTCP XR are subject to IANA registration.
For general guidelines on IANA allocations for RTCP XR, refer to
Section 6.2 of [RFC3611].
This document assigns one new block type value in the RTCP XR Block
Type Registry:
Name: TDM
Long Name: TR 101 290 Decodability Metrics
Value <TDM>
Reference: section 3
This document also registers one SDP [RFC4566] parameter for the
"rtcp-xr" attribute in the RTCP XR SDP Parameters Registry:
* "decodability-metrics"
The contact information for the registrations is:
Rachel Huang
rachel.huang@huawei.com
101 Software Avenue, Yuhua District
Nanjing, JiangSu 210012 China
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6. Security Considerations
This proposed RTCP XR report block introduces no new security
considerations beyond those described in [RFC3611].
7. References
7.1. Normative References
[ETSI] ETSI, "Digital Video Broadcasting (DVB); Measurement
guidelines for DVB systems", Technical Report TR 101 290,
2001.
[ISO-IEC.13818-1.2007]
International Organization for Standardization,
"Information technology - Generic coding of moving
pictures and associated audio information: Systems",
ISO International Standard 13818-1, October 2007.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC2250] Hoffman, D., Fernando, G., Goyal, V., and M. Civanlar,
"RTP Payload Format for MPEG1/MPEG2 Video", RFC 2250,
January 1998.
[RFC3550] Schulzrinne, H., Casner, S., Frederick, R., and V.
Jacobson, "RTP: A Transport Protocol for Real-Time
Applications", STD 64, RFC 3550, July 2003.
[RFC3611] Friedman, T., Caceres, R., and A. Clark, "RTP Control
Protocol Extended Reports (RTCP XR)", RFC 3611,
November 2003.
[RFC4566] Handley, M., Jacobson, V., and C. Perkins, "SDP: Session
Description Protocol", RFC 4566, July 2006.
[RFC5234] Crocker, D. and P. Overell, "Augmented BNF for Syntax
Specifications: ABNF", STD 68, RFC 5234, January 2008.
7.2. Informative References
[RFC6390] Clark, A. and B. Claise, "Guidelines for Considering New
Performance Metric Development", BCP 170, RFC 6390,
October 2011.
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Authors' Addresses
Rachel Huang
Huawei
101 Software Avenue, Yuhua District
Nanjing 210012
China
Email: rachel.huang@huawei.com
Qin Wu
Huawei
101 Software Avenue, Yuhua District
Nanjing, Jiangsu 210012
China
Email: bill.wu@huawei.com
Hitoshi Asaeda
Keio University
Graduate School of Media and Governance 5322 Endo
Fujisawa, Kanagawa 252-0882
Japan
Email: asaeda@wide.ad.jp
Glen Zorn (editor)
Network Zen
227/358 Thanon Sanphawut
Bang Na, Bangkok 10260
Thailand
Phone: +66 (0) 87-040-4617
Email: glenzorn@gmail.com
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