double rtcp_interval(int members,
int senders,
double rtcp_bw,
int we_sent,
int packet_size,
int *avg_rtcp_size,
int initial)
{
/*
* Minimum time between RTCP packets from this site (in seconds).
* This time prevents the reports from `clumping' when sessions
* are small and the law of large numbers isn't helping to smooth
* out the traffic. It also keeps the report interval from
* becoming ridiculously small during transient outages like a
* network partition.
*/
double const RTCP_MIN_TIME = 5.;
/*
* Fraction of the RTCP bandwidth to be shared among active
* senders. (This fraction was chosen so that in a typical
* session with one or two active senders, the computed report
* time would be roughly equal to the minimum report time so that
* we don't unnecessarily slow down receiver reports.) The
* receiver fraction must be 1 - the sender fraction.
*/
double const RTCP_SENDER_BW_FRACTION = 0.25;
double const RTCP_RCVR_BW_FRACTION = (1-RTCP_SENDER_BW_FRACTION);
/*
* Gain (smoothing constant) for the low-pass filter that
Schulzrinne, et al Standards Track [Page 69]
RFC 1889 RTP January 1996
* estimates the average RTCP packet size (see Cadzow reference).
*/
double const RTCP_SIZE_GAIN = (1./16.);
double t; /* interval */
double rtcp_min_time = RTCP_MIN_TIME;
int n; /* no. of members for computation */
