RTSP, RTP with Linux

[Erik Mouw]

On Wed, 19 Jan 2000 19:00:49 -0800, jordi ros wrote:
> I need to parse the packets received and sent when using an audio
> application such as RealPlayer G2. For that, I'm going to introduce some
> code in the networking IP stack of the Linux kernel. I have several
> basic questions:

You don't have to change the Linux IP stack for that: RTSP and RTP are
just protocols that run on top of any IP stack, no need for changes.

> (1) Is RealPlayer using any kind of RTP or RTSP protocol at the
> application layer?

RealPlayer G2 is able to use RTSP/RTP.

> (2) What's the relationship between RTP and RTSP?

AFAIK, RTSP is the control protocol, and RTP is used to transport the
data.

> (3) Can somebody give me the stack picture for this scenario? (maybe
> something like: ETHERNET / IP / UDP / RTSP?)

ethernet/IP/TCP/RTSP. (of course, you can use any other physical layer
instead of ethernet).

> (4) How can I parse the application level payload? Is it text based the
> same way HTTP is?

Yes, it is text based.

RTSP is being standardized by the IETF (RFC 2326). IETF is an open
standards body, so all documentation is available. Have a look at
http://www.ietf.org/ . You can search for RFCs at 
http://www.rfc-editor.org/rfcsearch.html .


Erik

PS: I'm not an expert in RTSP/RTP, but a coworker is working on a server
  implementation, so I know some of the terminology.

-- 
J.A.K. (Erik) Mouw, Information and Communication Theory Group, Department
of Electrical Engineering, Faculty of Information Technology and Systems,
Delft University of Technology, PO BOX 5031,  2600 GA Delft, The Netherlands
Phone: +31-15-2785859  Fax: +31-15-2781843  Email J.A.K.Mouw en its.tudelft.nl
WWW: http://www-ict.its.tudelft.nl/~erik/




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