[asterisk-dev] RTP Bridging optimization

[Kevin P. Fleming]

Vadim Lebedev wrote:

> I beleive you are mistaken,  the pipe syscals creates 2 file
> descirptors, one for reading other for writing....
> so in worst case you need 2 pipes meaning 4 fds
> so first you splice to a write side of first pipe from a socket, then
> optioanlly in case of montiored stream
> tee form read side of the first pipe to the write side of the second pipe,
> then splice from write side of the first pipe to the target socket, then
> read from the read side of the second pipe
> to perfrom monitoring

You just validated my point. A single bridge connecting two sockets
requires two pipes, one for each direction between the sockets. This
turns the '2 fds required' for a bridge into _6_ fds.

In addition, this only works in the cases where the media streams are
completely compatible, including dynamic RTP format number assignments,
frame lengths and other variables.