draft-ietf-avtext-client-to-mixer-audio-level-04.txt   draft-ietf-avtext-client-to-mixer-audio-level-05.txt 
AVT J. Lennox, Ed. AVT J. Lennox, Ed.
Internet-Draft Vidyo Internet-Draft Vidyo
Intended status: Standards Track E. Ivov Intended status: Standards Track E. Ivov
Expires: February 28, 2012 Jitsi Expires: March 23, 2012 Jitsi
E. Marocco E. Marocco
Telecom Italia Telecom Italia
August 27, 2011 September 20, 2011
A Real-Time Transport Protocol (RTP) Header Extension for Client-to- A Real-Time Transport Protocol (RTP) Header Extension for Client-to-
Mixer Audio Level Indication Mixer Audio Level Indication
draft-ietf-avtext-client-to-mixer-audio-level-04 draft-ietf-avtext-client-to-mixer-audio-level-05
Abstract Abstract
This document defines a mechanism by which packets of Real-Time This document defines a mechanism by which packets of Real-Time
Transport Protocol (RTP) audio streams can indicate, in an RTP header Transport Protocol (RTP) audio streams can indicate, in an RTP header
extension, the audio level of the audio sample carried in the RTP extension, the audio level of the audio sample carried in the RTP
packet. In large conferences, this can reduce the load on an audio packet. In large conferences, this can reduce the load on an audio
mixer or other middlebox which wants to forward only a few of the mixer or other middlebox which wants to forward only a few of the
loudest audio streams, without requiring it to decode and measure loudest audio streams, without requiring it to decode and measure
every stream that is received. every stream that is received.
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This Internet-Draft will expire on February 28, 2012. This Internet-Draft will expire on March 23, 2012.
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Table of Contents Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4 2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Audio Levels . . . . . . . . . . . . . . . . . . . . . . . . . 4 3. Audio Levels . . . . . . . . . . . . . . . . . . . . . . . . . 3
4. Signaling (Setup) Information . . . . . . . . . . . . . . . . 6 4. Signaling (Setup) Information . . . . . . . . . . . . . . . . 5
5. Considerations on Use . . . . . . . . . . . . . . . . . . . . 7 5. Considerations on Use . . . . . . . . . . . . . . . . . . . . 6
6. Security Considerations . . . . . . . . . . . . . . . . . . . 8 6. Security Considerations . . . . . . . . . . . . . . . . . . . 7
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 8 7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 7
8. References . . . . . . . . . . . . . . . . . . . . . . . . . . 9 8. References . . . . . . . . . . . . . . . . . . . . . . . . . . 8
8.1. Normative References . . . . . . . . . . . . . . . . . . . 9 8.1. Normative References . . . . . . . . . . . . . . . . . . . 8
8.2. Informative References . . . . . . . . . . . . . . . . . . 9 8.2. Informative References . . . . . . . . . . . . . . . . . . 8
Appendix A. Changes From Earlier Versions . . . . . . . . . . . . 10 Appendix A. Changes From Earlier Versions . . . . . . . . . . . . 9
A.1. Changes From Draft -03 . . . . . . . . . . . . . . . . . . 10 A.1. Changes From Draft -03 . . . . . . . . . . . . . . . . . . 9
A.2. Changes From Draft -02 . . . . . . . . . . . . . . . . . . 10 A.2. Changes From Draft -02 . . . . . . . . . . . . . . . . . . 9
A.3. Changes From Draft -01 . . . . . . . . . . . . . . . . . . 10 A.3. Changes From Draft -01 . . . . . . . . . . . . . . . . . . 9
A.4. Changes From Individual Submission Draft -01 . . . . . . . 11 A.4. Changes From Individual Submission Draft -01 . . . . . . . 10
A.5. Changes From Individual Submission Draft -00 . . . . . . . 11 A.5. Changes From Individual Submission Draft -00 . . . . . . . 10
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 11 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 10
1. Introduction 1. Introduction
In a centralized Real-Time Transport Protocol (RTP) [RFC3550] audio In a centralized Real-Time Transport Protocol (RTP) [RFC3550] audio
conference, an audio mixer or forwarder receives audio streams from conference, an audio mixer or forwarder receives audio streams from
many or all of the conference participants. It then selectively many or all of the conference participants. It then selectively
forwards some of them to other participants in the conference. In forwards some of them to other participants in the conference. In
large conferences, it is possible that such a server might be large conferences, it is possible that such a server might be
receiving a large number of streams, of which only a few are intended receiving a large number of streams, of which only a few are intended
to be forwarded to the other conference participants. to be forwarded to the other conference participants.
skipping to change at page 9, line 36 skipping to change at page 8, line 36
[I-D.ietf-avtcore-srtp-encrypted-header-ext] [I-D.ietf-avtcore-srtp-encrypted-header-ext]
Lennox, J., "Encryption of Header Extensions in the Secure Lennox, J., "Encryption of Header Extensions in the Secure
Real-Time Transport Protocol (SRTP)", Real-Time Transport Protocol (SRTP)",
draft-ietf-avtcore-srtp-encrypted-header-ext-00 (work in draft-ietf-avtcore-srtp-encrypted-header-ext-00 (work in
progress), June 2011. progress), June 2011.
[I-D.ietf-avtext-mixer-to-client-audio-level] [I-D.ietf-avtext-mixer-to-client-audio-level]
Ivov, E., Marocco, E., and J. Lennox, "A Real-Time Ivov, E., Marocco, E., and J. Lennox, "A Real-Time
Transport Protocol (RTP) Header Extension for Mixer-to- Transport Protocol (RTP) Header Extension for Mixer-to-
Client Audio Level Indication", Client Audio Level Indication",
draft-ietf-avtext-mixer-to-client-audio-level-03 (work in draft-ietf-avtext-mixer-to-client-audio-level-05 (work in
progress), July 2011. progress), September 2011.
[I-D.perkins-avt-srtp-vbr-audio] [I-D.perkins-avt-srtp-vbr-audio]
Perkins, C. and J. Valin, "Guidelines for the use of Perkins, C. and J. Valin, "Guidelines for the use of
Variable Bit Rate Audio with Secure RTP", Variable Bit Rate Audio with Secure RTP",
draft-perkins-avt-srtp-vbr-audio-05 (work in progress), draft-perkins-avt-srtp-vbr-audio-05 (work in progress),
December 2010. December 2010.
[ITU.G711.1988] [ITU.G711.1988]
International Telecommunications Union, "Pulse Code International Telecommunications Union, "Pulse Code
Modulation (PCM) of Voice Frequencies", ITU- Modulation (PCM) of Voice Frequencies", ITU-
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