Hi,
I know thats not right place to ask it here, but i don't know right
place and many of this list users know the answer.
I'm trying to implement RTCP/RTP but some places in rfc will stay unclear.
RFC 3550 6.3
....
*******************************************************************
To execute these rules, a session participant must maintain several
pieces of state:
tp: the last time an RTCP packet was transmitted;
tc: the current time;
tn: the next scheduled transmission time of an RTCP packet;
pmembers: the estimated number of session members at the time tn
was last recomputed;
members: the most current estimate for the number of session
members;
senders: the most current estimate for the number of senders in
the session;
rtcp_bw: The target RTCP bandwidth, i.e., the total bandwidth
that will be used for RTCP packets by all members of this session,
in octets per second. This will be a specified fraction of the
"session bandwidth" parameter supplied to the application at
startup.
we_sent: Flag that is true if the application has sent data
since the 2nd previous RTCP report was transmitted.
avg_rtcp_size: The average compound RTCP packet size, in octets,
over all RTCP packets sent and received by this participant. The
size includes lower-layer transport and network protocol headers
(e.g., UDP and IP) as explained in Section 6.2.
initial: Flag that is true if the application has not yet sent
an RTCP packet.
************************************************************
Ok from there i get each session participant holds that info.
But now from 6.3.4 Receiving an RTCP BYE Packet
***********************************************************
o The value for tn is updated according to the following formula:
tn = tc + (members/pmembers) * (tn - tc)
o The value for tp is updated according the following formula:
tp = tc - (members/pmembers) * (tc - tp).
o The next RTCP packet is rescheduled for transmission at time tn,
which is now earlier.
**********************************************************
How that affects next RTCP packet time, if each participant holds that
state and is responsible for sending it's sender report(SR) ?
Or i miss something ?
And about receiver reports and also sender reports, what is responsible
sending of them, RTP session or participant.
Thanks
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