[vorbis-dev] Vorbis over RTP - first attempt

[Ralph Giles]

On Sun, May 30, 2004 at 02:34:03AM +0200, Tor-Einar Jarnbjo wrote:

> - I was planning to replace the identification header with appropriate 
> entries in the SDP descriptor. However, the frame sizes are defined here 
> (why not in the setup header) and if we'll allow different codebooks 
> (and then likely different frame sizes), there must be a way to get 
> these together with the new setup header.

I'd guess it's done this way because the blocksizes are useful for 
measuring stream length, which doesn't require access to the codebooks.

> - The flags in the audio packets describing the frame length (short or 
> long) for the previous and next packets are problematic when handling 
> packet loss.

Can you elaborate of this? Surely the packet sequence number informs you 
when there's a hole in the data? In that case you need to skip the 
overlap with the previous packet anyway.

> - Streaming CMML as a complete XML document is difficult enough for 
> unicast transmission (packet loss handling) and impossible for multicast 
> purposes. Would it be a feasible solution to drop the document header 
> <?xml...><cmml> and footer </cmml> and demand RTP packets to contain 
> separate entities, which may be decoded as standalone XML snippets (e.g. 
> just one clip or title element in one RTP packet)?

What about putting the whole CMML document in a single packet?

Way cool on the implementation effort!

 -r
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