[lwip-users] Re: [lwip] Web Cam with uIP

[Adam Dunkels]

Hi!

On Monday 13 May 2002 05.00, you wrote:
> Do anybody here have write the application program with uIP that able to
> connect to Web Cam??....Is it possible or I just sound crazy!!

I would definately be possible, but there are a few things to look out for 
though. First off, there is an important design decision to make; whether the 
camera should stream the data using RTP over UDP, or if it should somehow 
send it over TCP (using HTTP, for instance). The difference is that TCP is 
reliable and will retransmit lost packets, leading to throughput degradation. 
This is very problematic for uIP, since it does not offer very good 
throughput. lwIP would definately be better than uIP in this sense.

Using RTP over UDP would probably be easier with lwIP since it supports UDP 
"out of the box". But even with uIP it should not be too hard to do it (look 
at http://tfe.c64.org/ for an example of a uIP application that streams data 
over RTP/UDP). In this case, TCP would only be used to set up the RTP/UDP 
data stream and throughput would not matter as much.

/adam
-- 
Adam Dunkels <address@hidden>
http://www.sics.se/~adam
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