UDP Sockets

Dear All,

I would really appreciate reasonably detailed answers to the following 2
questions (urgent), this would represent a gread push to my project. I am
developing under windows and interested in RTP transport over UDP of mp4
media.

1) Where exactly (class::function) are the socket API functions sendto(...)
and recvfrom(...) called at the server and client respectively? I am just
interested in the actual transmission through the socket API (i.e. at the
lowest level) and I am quite frustrated with all the OS abstractions
available within the source code.

2) Suppose I comment the function calls in 1), to replace them by similar
ones but on a socket (only one) I create myself, still passing the received
"buffers" appropriately to the upper layers, would this work? I know that
each stream in the presentation (audio and video) has its own UDP socket,
but does this mean that the socket IO functions are called in a threaded
manner and that the data received on the audio stream's socket will be
stored in a transport buffer for that stream (and same for video)? That is,
are the different streams buffered separately at the transport layer (based
on the stream number maybe)?

Thank you in advance,

Mahmoud Hammoud

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