[xiph-rtp] header caching and chaining

[Ralph Giles]

On Sun, Apr 10, 2005 at 11:18:40PM +0100, Phil Kerr wrote:

> >Also, it occured to me that while storing actual info in the SSRC would 
> >be an abuse, switching on SSRC,ident pairs might be ok. I don't suggest 
> >that this is a good idea, but it does leave lots of headroom.
> >
> The SSRC needs to be a random value.  Having it as a derived value will 
> be against RTP specs.

That's what I was saying. It can't be a derived value, but things in the 
SDP could be derived from it. Or is that also contradicted?

> >I'd also suggest s/hash/md5/ just so it's possible to change the hash
> >later.
> >
> MD5 is 128 bit, a hash can be different sizes.  Key could be a better 
> description.

To be able to verify the hash you need to know the algorithm.

> Also Aaron's little SDP example above is 770 octets, isn't the maximum 
> SDP message length 1000 octets?  This chaining mechanism could be 
> limited if it passes its data in SDP like this.

Hmm. removing the indirection as I suggested would help, but only so 
much. Using the implicit url mapping Aaron proposed would help a lot 
more. Do you have another suggestion?

 -r