Support for sending RTCP RR

[pjsipbot]

2007-09-20 12:29:36: @bennylp created the issue on trac ticket 377

This is duplicate of ticket #13 for trunk.

The RTCP framework should send RTCP RR when it's not transmitting anything.

Currently the transmission of RTCP was driven by transmission of RTP, so when an endpoint is only actively listening (and not sending anything, although stream direction is send-recv), then no RTCP packet is sent.

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2007-09-20 12:32:59: @bennylp changed status from new to closed

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2007-09-20 12:32:59: @bennylp set resolution to fixed

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2007-09-20 12:32:59: @bennylp commented

Implemented in r1444.

The pjmedia_rtcp_build_rtcp() function now may create RTCP SR (Sender Report) or RR (Receiver Report) depending on whether the endpoint has been transmitting RTP packets since the last interval.

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2007-09-20 13:09:51: @bennylp commented

In r1445:
Fixed bug in RTCP fraction_lost calculation: the first RTCP packet always shows positive fraction loss

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2007-09-20 13:41:04: @bennylp commented

In r1446: Fixed bug in incoming RTCP RR handling because the RTCP packet structure has been changed in r1444