data source being reported
fraction lost since last SR/RR
the cumululative number of packets lost
the extended last sequence number received
the interarrival jitter
the last SR packet from this source
the delay since last SR packet
true if the packet was created. This function can return false if the max MTU is exceeded or the number of report blocks is greater than #GST_RTCP_MAX_RB_COUNT.
Add a new report block to packet with the given values.