“Silly SAP Client 0.1d1” released.
Want to watch those IP RTP Multicast sessions with QuickTime?
Wonder where QuickTime TV, not to mention QuickTime Conferencing,
went? So do I.
Here is a little something, anyway:
Get it from:
afp://aws2.nada.kth.se/ login as guest, Public, Silly SAP Client 0.1d1.sea
Silly SAP Client is used as a helper program for receiving IP
Multicast RTP (Real Time Protocol) sessions. It does (parts of) what
the Unix program “sdr” does. It receives the SDP (Session Description
Protocol) messages, and puts each in a separate file.
The SDP files are currently created in the same folder as the
program! Put it in a folder in your Apple Menu, and let it run for a
while to find groups.
If you don’t get any, you probably don’t have a multicast feed to
your network. Ask your network manager!
You’ll have to clean up your SDP folder from old announcements yourself!
Make sure you have QuickTime 4.0 installed
(http://www.apple.com/quicktime). Open a SDP file, and watch/listen!
This program can (yet) only receive the simplest form of SDP
The sessions are announced on the IP Multicast group sap.mcast.net
(126.96.36.199) with the SAP protocol (Sessions Announcement
Protocol). Each announcement contains a SDP (Session Description
Protocol) message, a text based description of how to receive the
data stream(s) for this session.
The SDP messages are written to files that QuickTime Player can read,
and QuickTime/QuickTime Player does all the rest.
The SDP files are really just text files, take a look if you want.
I wrote this program just because no one else did (why not, damn
it!). It needs a user interface and some other stuff, and could
easily be made to work with non multicast RTSP servers as Cisco IP/TV
server and similar.
I’ll give the source to anyone who asks, and maybe I’ll put it
online, too. It’s based on Metrowerks Powerplant example program
“Netclient”. This text is probably longer than the source code I have
written myself for this program.
Some parts: 1999 Ragnar Sundblad, firstname.lastname@example.org
Other parts: 1995-1998 Metrowerks Inc.
And a little bit: 1993-1996 by Apple Computer, Inc., all rights reserved.
Department of Numerical Analysis and Computing Science
Royal Institute of Technology
Tel: +46 (8) 790 62 75
Fax: +46 (8) 10 18 64
S-100 44 STOCKHOLM