Share code to set source description and add contributing sources.
Create minimal and full source description to send into RTCP packets.
Put the ortp_timeval_to_ntp function in utils.c.
Add ortp_get_cur_time_ms().
Share the common struct fields of RtpStream and RtcpStream + Compute RTCP bandwidths.
Fix possible error in bandwidth computing (update time of computing start on last compute, not on last packet handled after last compute).
Add function to define the target upload bandwidth of an RTP session.
Define ortp_stream_is_ipv6 in utils.c so that it can be used everywhere in oRTP.
Implement RTCP send algorithm as described in RFC 3550.
Remove useless RtcpStream fields.
Put RTCP XR and RTCP FB handling in their own source code files + handle sending of RTCP XR packets.
Implement RTCP send algorithm from RFC 4585 for AVPF streams.
fix compilation issue