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VRTP: Implementing a Monitor Application for the Real-Time Transport Protocol (RTP) using the Java Media Framework (JMF)

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VRTP: Implementing a Monitor Application for the Real-Time Transport Protocol (RTP) using the Java Media Framework (JMF) Francisco Afonso Thesis Advisor: Don Brutzman September 1999. Thesis Motivation. An RTP monitor is a useful tool for MBone applications and future vrtp applications

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VRTP: Implementing a Monitor Application for the Real-Time Transport Protocol (RTP) using the Java Media Framework (JMF)

Francisco Afonso

Thesis Advisor: Don Brutzman

September 1999

thesis motivation
Thesis Motivation
  • An RTP monitor is a useful tool for MBone applications and future vrtp applications
  • JMF is a possible solution for the implementation of the RTP protocol in vrtp
  • JMF is a free package, extension of Java language
  • The RTP Monitor is the first step to understanding JMF for future transmission and reception of simulation data
real time transport protocol rtp
Real-Time Transport Protocol (RTP)
  • RTP is a protocol designed to support the transmission of time-based media, such as audio and video, over multicast-capable networks
  • Using RTP a session between several participants can be established (many to many). Each participant sends feedback messages about the reception of each sender. (RTP Control Protocol - RTCP)
  • RTP does not guarantee real-time delivery, since it usually runs over UDP
  • RTP is used in MBone - Multicast Backbone (an experimental worldwide multicast network)
rtp monitor application
RTP Monitor Application

Definition: an RTP monitor is an application that receives packets sent by all participants, to estimate the quality of service for distribution monitoring, fault diagnosis and long-term statistics. (RFC 1889)

java media framework jmf
Java Media Framework (JMF)
  • JMF is a Java API developed by Sun Microsystems and other companies to allow the use of multimedia features by Java applications and applets
  • Supports reception and transmission of audio and video streams using RTP
  • Latest version: JMF 2.0 Beta
virtual reality transfer protocol vrtp
Virtual Reality Transfer Protocol (vrtp)
  • vrtp is being developed to provide client, server, multicast streaming & network-monitoring capabilities in support of internetworked 3D graphics and large-scale virtual environments
thesis work
Thesis Work
  • RTP specification (RFC 1889) - 70 pages
  • JMF API Programmer's Guide - 200 pages
  • JMF Javadoc (RTP API only) - 120 pages
  • - 29 classes, 22 interfaces, 4 exceptions
  • JMF example source code
  • A lot of Internet browsing about RTP
  • JMF and IEFT - AVT mailing lists
rtpmonitor features
rtpMonitor Features
  • Displays global and stream statistics
  • Displays participants and feedback reports
  • Records statistics on files ( last five minutes, previous five minutes, last hour, previous hour, different dates)
  • Plays audio or video received in the session
  • Saves session addresses and names as bookmarks
  • Allows customization ( recording interval, presentation interval, participation in the session, … )
  • Launches external application for viewing output files
lessons learned
Lessons Learned
  • Software reuse is good. Do not reinvent the wheel!
  • Big companies make big pieces of software with lots of bugs. Try to help detect the bugs, specially if the software is free and you need it.
  • Study Design Patterns. They have been used by good software designs.
  • Subscribe mailing lists about your thesis topic. You can learn with other people problems and experiences.
  • Internet standards are still evolving. You can help!
future work
Future Work
  • In RTPMonitor:
    • Present information about the participants
    • Save statistics in XML format
    • Analyze stored statistics and present them graphically
    • Receive Session Description Protocol (SDP) announcements
  • In vrtp:
    • Send and receive simulation data with RTP and JMF
some web references
Some Web References

RTP: http://www.ietf.org/internet-drafts/draft-ietf-avt-rtp-new-04.txt

JMF: http://www.javasoft.com/products/java-media/ jmf/index.html

vrtp: http://www.web3d.org/WorkingGroups/vrtp/

XML: http://www.w3.org/XML

UML: http://www.rational.com/uml/index.jtmpl

contact information
Contact Information
  • Francisco Afonso - afonso@cs.nps.navy.mil
  • Don Brutzman - brutzman@nps.navy.mil
    • http://web.nps.navy.mil/~brutzman