draft-ietf-avt-rtcpxr-audio-00.txt   draft-ietf-avt-rtcpxr-audio-01.txt 
Internet Engineering Task Force A. Clark Internet Engineering Task Force A. Clark
Internet-Draft Telchemy Incorporated Internet-Draft Telchemy Incorporated
Expires: 29th December 2007 A. Pendleton Expires: 18th May 2008 A. Pendleton
Nortel Nortel
November 2007
RTCP XR - Audio Metrics Report Block RTCP XR - Audio Metrics Report Block
draft-ietf-avt-rtcpxr-audio-00.txt draft-ietf-avt-rtcpxr-audio-01
Status of this Memo Status of this Memo
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This Internet-Draft will expire on 29th December 2007. This Internet-Draft will expire on 18th May 2008.
Copyright Notice Copyright Notice
Copyright (C) The IETF Trust (2007). Copyright (C) The IETF Trust (2007).
Abstract Abstract
This document defines extensions to the RTCP XR extended report This document defines extensions to the RTCP XR extended report
packet type blocks to support the performance monitoring of audio packet type blocks to support the performance monitoring of audio
streams transmitted using RTP. streams transmitted using RTP.
This draft is one of a set of four that replace the -00 version
of the ietf-avt-rtcpxr-video-00.txt draft.
Clark [Page 1] Clark [Page 1]
Table of Contents Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Definitions . . . . . . . . . . . . . . . . . . . . . . . . 2 2. Definitions . . . . . . . . . . . . . . . . . . . . . . . . 2
3. Audio Metrics Report Block . . . . . . . . . . . . . . . . . X 3. Audio Metrics Report Block . . . . . . . . . . . . . . . . . 2
4. Summary . . . . . . . . . . . . . . . . . . . . . . . . . . X 4. Summary . . . . . . . . . . . . . . . . . . . . . . . . . . 4
5. Security Considerations . . . . . . . . . . . . . . . . . . 13 5. Security Considerations . . . . . . . . . . . . . . . . . . 4
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . 13 6. IANA Considerations . . . . . . . . . . . . . . . . . . . . 4
7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . X 7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 4
8. Informative References . . . . . . . . . . . . . . . . . . . 13 8. Informative References . . . . . . . . . . . . . . . . . . . 4
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . Authors' Addresses . . . . . . . . . . . . . . . . . . . . . 4
Intellectual Property and Copyright Statements . . . . . . . Intellectual Property and Copyright Statements . . . . . . . 5
1. Introduction 1. Introduction
This draft defines a block type to augment those defined This draft defines a block type to augment those defined
in RFC3611 for use in Quality of Service reporting for audio over IP. in RFC3611 for use in Quality of Service reporting for audio over IP.
The new block type defined in this draft is the IP Audio Metrics The new block type defined in this draft is the IP Audio Metrics
Report Block. This is intended to support both the identification of Report Block. This is intended to support both the identification of
problems affecting performance and the collection of data that may problems affecting performance and the collection of data that may
be useful in optimizing system configuration. be useful in optimizing system configuration.
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0 1 2 3 0 1 2 3
0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| BT=N | Reserved | block length | | BT=N | Reserved | block length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SSRC | | SSRC |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0| Program ID | Reserved | |0 0 0| Program ID | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Report Timestamp |
Clark [Page 2]
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Measurement Interval (ms) | | Measurement Interval (ms) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| MOS-A - Audio Quality (M/L) | MOS-A Audio Quality (R) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Mean Audio bit rate (bits/sec) | | Mean Audio bit rate (bits/sec) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Clark [Page 2]
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Round Trip Delay | A-V Delay (Video I/F) | | Round Trip Delay | A-V Delay (Video I/F) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Playout Interrupt Count | Mean Playout Interrupt Size | | Playout Interrupt Count | Mean Playout Interrupt Size |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Audio Playout buffer size | Mean buffer level | | Audio Playout buffer size | Mean buffer level |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
3.2 Definition of Metrics 3.2 Definition of Metrics
3.2.1 Header 3.2.1 Header
The header comprises: The header comprises:
(i) Block Type for this report block (i) Block Type for this report block
(ii) Reserved (set to 0xFF) (ii) Reserved (set to 0xFF)
(iii) Block length in words (set to 0x0009) (iii) Block length in words (set to 0x0008)
(iv) SSRC of the received RTP stream that this report refers to (iv) SSRC of the received RTP stream that this report refers to
(v) Program ID (PID) for the audio stream (if MPEG Transport (v) Program ID (PID) for the audio stream (if MPEG Transport
encapsulation is used) encapsulation is used)
(vi) Reserved (set to 0xFFFF) (vi) Reserved (set to 0xFFFF)
3.2.2 Report Timestamp 3.2.2 Measurement Interval
The time at which this report was generated (format?)
3.2.3 Measurement Interval
The interval of time over which these metrics were measured, The interval of time over which these metrics were measured,
expressed in milliseconds. expressed in milliseconds.
3.2.4 MOS-A (M/L) and MOS-A (R) 3.2.3 Mean Audio Bit Rate
An estimate of the quality of the received audio stream expressed
as a Mean Opinion Score.
(i) MOS-A (M/L). The quality score for a monophonic stream or
the Left channel for a stereophonic stream
(ii) MOS-A (R). The quality score for the Right channel of a
stereophonic stream
3.2.5 Mean Audio Bit Rate
The average bit rate of the audio stream expressed in bits per The average bit rate of the audio stream expressed in bits per
second. second.
3.2.6 Round Trip Delay 3.2.4 Round Trip Delay
The Round Trip Delay between the originating and terminating ends The Round Trip Delay between the originating and terminating ends
of this RTP stream, expressed in millseconds. In unicast or of this RTP stream, expressed in millseconds. In unicast or
multicast applications this parameter may be set to "undefined" multicast applications this parameter may be set to "undefined"
(0xFFFF). (0xFFFF).
Clark [Page 3] 3.2.5 A-V Delay
3.2.7 A-V Delay
The relative delay between decoded audio and video streams expressed The relative delay between decoded audio and video streams expressed
in milliseconds. in milliseconds.
3.2.8 Playout Interrupt Count 3.2.6 Playout Interrupt Count
The number of interruptions that occurred during playout, due to The number of interruptions that occurred during playout, due to
either packet loss or buffer underrun. either packet loss or buffer underrun.
3.2.9 Mean Playout Interrupt Size 3.2.7 Mean Playout Interrupt Size
The mean duration of interruptions in playout expressed in The mean duration of interruptions in playout expressed in
milliseconds. milliseconds.
3.2.10 Audio Playout Buffer Size 3.2.8 Audio Playout Buffer Size
The available playout buffer size, expressed in milliseconds. The available playout buffer size, expressed in milliseconds.
3.2.11 Mean Buffer Level 3.2.9 Mean Buffer Level
The mean playout buffer size, expressed in milliseconds. The mean playout buffer size, expressed in milliseconds.
Clark [Page 3]
4. Summary 4. Summary
This draft defines an RTCP XR block for audio quality reporting. This draft defines an RTCP XR block for audio quality reporting.
This is intended for in-service monitoring of audio streaming, IPTV This is intended for in-service monitoring of audio streaming, IPTV
and IP videoconferencing services to provide real time performance and IP videoconferencing services to provide real time performance
feedback and support performance management. feedback and support performance management.
5. IANA Considerations 5. IANA Considerations
The block type "mmm" will need to be replaced with an IANA assigned The block type "mmm" will need to be replaced with an IANA assigned
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8. Informative References 8. Informative References
[1] Bradner, S., "Key words for use in RFCs to Indicate Requirement [1] Bradner, S., "Key words for use in RFCs to Indicate Requirement
Levels", BCP 14, RFC 2119, March 1997. Levels", BCP 14, RFC 2119, March 1997.
[2] Schulzrinne, H., Casner, S., Frederick, R. and V. Jacobson, [2] Schulzrinne, H., Casner, S., Frederick, R. and V. Jacobson,
"RTP: A Transport Protocol for Real-Time Applications", STD 64, "RTP: A Transport Protocol for Real-Time Applications", STD 64,
RFC 3550, July 2003. RFC 3550, July 2003.
Clark [Page 4]
[3] Friedman, T., Caceres, R. and A. Clark, "RTP Control Protocol [3] Friedman, T., Caceres, R. and A. Clark, "RTP Control Protocol
Extended Reports (RTCP XR)", RFC 3611, November 2003. Extended Reports (RTCP XR)", RFC 3611, November 2003.
Authors' Addresses Authors' Addresses
Alan Clark Alan Clark
Telchemy Incorporated Telchemy Incorporated
2905 Premiere Parkway, Suite 280 2905 Premiere Parkway, Suite 280
Duluth, GA 30097 Duluth, GA 30097
Email: alan@telchemy.com Email: alan@telchemy.com
Amy Pendleton Amy Pendleton
Nortel Nortel
2380 Performance Drive 2380 Performance Drive
Richardson, TX 75081 Richardson, TX 75081
Email: aspen@nortel.com Email: aspen@nortel.com
Full Copyright Statement Full Copyright Statement
Clark [Page 4]
Copyright (C) The IETF Trust (2007). Copyright (C) The IETF Trust (2007).
This document is subject to the rights, licenses and restrictions This document is subject to the rights, licenses and restrictions
contained in BCP 78, and except as set forth therein, the authors contained in BCP 78, and except as set forth therein, the authors
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This document and the information contained herein are provided on an This document and the information contained herein are provided on an
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OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY, THE IETF TRUST AND OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY, THE IETF TRUST AND
THE INTERNET ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS THE INTERNET ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS
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on the procedures with respect to rights in RFC documents can be on the procedures with respect to rights in RFC documents can be
found in BCP 78 and BCP 79. found in BCP 78 and BCP 79.
Copies of IPR disclosures made to the IETF Secretariat and any Copies of IPR disclosures made to the IETF Secretariat and any
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Clark [Page 5]
The IETF invites any interested party to bring to its attention any The IETF invites any interested party to bring to its attention any
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Acknowledgement Acknowledgement
Funding for the RFC Editor function is provided by the IETF Funding for the RFC Editor function is provided by the IETF
Administrative Support Activity (IASA). Administrative Support Activity (IASA).
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