jlibrtp RTP Java Library

1
jlibrtp RTP Java Library

• Arne Kepp, Vaishnav Janardhan
• COMS 4995 VoIP Security
• Course Advisor Prof. Schulzrinne

2
Scope of Project

• Group reduced from 4 to 2
• Goals, in chronological order
• RFC 3550 Real-Time Protocol
• Tools for testing / demonstration
• RFC 4751 Framing
• RFC 3551 RTP Profile for Audio and Video
  Conferences with Minimal Control
• Left out due to lack of resources
• Secure RTP
• Fancy data recovery attempts

3
Sending RTP PacketsThreaded model
4
Receiving RTP PacketsThreaded model
5
Sending and Receiving Framework
6
Including RTCP
7
Frame Reconstruction
8
Buffer of Complete Frames
9
Rational Rose Work in Progress
10
API

• Functions on Session object
• new RtpSession(ssrc, payload, profile)
• RtpSession.addTarget(ip, port)
• RtpSession.addSource(ip, port)
• RtpSession.removeTarget(ip, port)
• RtpSession.removesource(ip, port)
• RtpSession.putData(timestamp, csrc, data)
• RtpSession.close()
• Callback
• RtpSession.getData(timestamp, csrc, data)
• RtpSession.sessionEvent(type, data)

11
Similar Efforts

• ccRTP (GNU / Columbia)
• C library developed at Columbia, GPL
• http//data.gnutelephony.org/ccrtp/manual/html/ind
  ex.html
• Java Media Framework (Sun)
• If a customer wants to license JMF source code
  for a commercial product, a Commercial Use
  Attachment to the SCSL must be executed with
  Sun.
• Flexibility, accommodate changes
• Java.net.RTP (Columbia)
• Java library developed at Columbia in 1998
• No license information, old, not general
• http//www.cs.columbia.edu/hgs/teaching/ais/1998/
  projects/java_rtp/

12
GNU Lesser General Public License

• aka GNU Library GPL
• http//www.gnu.org/licenses/lgpl.html
• Free software
• Relatively complicated license
• Source code for library must be distributed with
  product under same terms
• The product using the library does not have to be
  free software

13
SourceForge Project
14
Status

• Determined scope of project
• SourceForge approved
• Classes in Rational Rose (incomplete)
• Next milestones
• October 28th Skeleton and test program
• November 5th Multiple sources, frame splitting
• November 11th Payloads and Profiles
• November 18th Interoperability testing