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RTCP抖动、丢包率的计算方法

RTCP

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英语的，RTCP包的计算方法，有公式 Quality-of-service monitoring and reporting » Real-time control protocol RTCP

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COMP 249 Advanced Distributed Systems

Multimedia Networking

http://www.cs.unc.edu/~jeffay/courses/comp249f99

The Multimedia Control Protocol RTCP

Kevin Jeffay

Department of Computer Science

University of North Carolina at Chapel Hill

jeffay@cs.unc.edu

October 5, 1999

The Multimedia Transport Protocol RTP

Outline

u RTP concepts

» Entities and abstractions

u Protocol definition

» Header format and packet structure

u Developing interoperable applications with RTP

» RTP profiles

u Quality-of-service monitoring and reporting

» Real-time control protocol RTCP

The Real-Time Control Protocol RTCP

Overview

u Senders & receivers periodically generate reports of

various session statistics and multicast to the group

RTP

data

RTP

Monitor

RTCP

reception reports

Internetwork

u RTCP enables...

» Diagnosis of faults in the multicast distribution tree

» Congestion control

» Third party performance monitoring & logging

» (Simple) conference control

The Real-Time Control Protocol RTCP

Message types

u Sender reports (SR)

» cumulative frame & byte

counts

» wall clock/timestamp

values

u Receiver reports (RR)

» frame loss/Frame

delivery rate

Sender

Reports

Receiver Reports

RTP

Monitor

u Source description (SDES)

items

» useful ASCII text strings

(user & host name of participant,

e-mail address, notes, ...)

u “Bye” message

» used to update participant’s

SSRC tables

Internetwork

The Real-Time Control Protocol RTCP

Mechanics

u RTCP messages are “stackable”

» To amortize header overhead, multiple RTCP messages can be

combined and sent in a compound RTCP message

u RTCP messages are always sent in (at least) pairs

» Messages must always contain a sender/receiver report and a

source description message containing the canonical name

(CNAME) of the participant

u RTCP messages are sent periodically with a period set to

ensure that control messages consume no more than 5% of

the session bandwidth

» Much of the contents of sender & receiver reports are included

so that participants can compute the RTCP sending interval

IP header

UDP header

RTCP header

The Real-Time Control Protocol RTCP

Message encapsulation

UDP

Message

Compound

RTCP

Message

RTCP Message

Reception Report

...

Reception Report

RTCP header

Optional

Reports

RTCP

SDES

Report

RTCP

Sender/Receiver

Report

Block

CNAME

RTCP header

...

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评论星级较低，若资源使用遇到问题可联系上传者，3个工作日内问题未解决可申请退款~

yzethan

2015-05-22

多谢分享！
ye_9th

2016-04-05

文档清晰，谢谢分享
sunsongshan0711

2015-05-13

与RTCP标准协议描述基本一致，没必要参考这个。我是想看在RTP乱序情况下RTCP如何计算丢包率，这篇文章没有提及。。。
lovepyang

2018-10-10

不错，可以用。
leewoniu

2016-08-15

很有启发，虽然文章内容没有用到