/// <summary>
/// Called by RtcpSender when it is time to collect Rtcp data
/// </summary>
/// <returns>A CompoundPacketBuilder</returns>
CompoundPacketBuilder RtcpSender.IRtpSession.RtcpReportIntervalReached()
{
// Limit the frequency of the cleanup in order to avoid participants and streams being
// inappropriately designated as stale. This can happen if we start up a lot of senders at once.
// Each sender triggers an RTCP packet which without the frequency limitation could
// increment the stale counter to its limit and cause the participant or stream to be removed.
bool cleanUpNow = false;
if (DateTime.Now > this.lastCleanUp.AddSeconds(5)) {
cleanUpNow = true;
this.lastCleanUp = DateTime.Now;
}
// A stale participant is one who is not sending Rtcp data
if (cleanUpNow)
CheckForStaleParticipants();
// Add participant data
Debug.Assert(participant.SSRC != 0);
cpb.ParticipantData(participant);
// Add Rtp data
if(rtpTraffic)
{
// A stale stream is one not sending Rtp traffic
if (cleanUpNow)
CheckForStaleStreams();
// Collect SenderReportPackets and SDESReports from each Sender
lock(rtpSenders)
{
foreach(RtpSender sender in rtpSenders.Values)
{
// this adds the SR and SDES packets
sender.UpdateRtcpData();
}
}
// add a sdes (source description)
//cpb.Add_SDESReport(participant.SSRC, participant);
// Collect ReceiverReports from each of the streams
lock(streamsAndIPs)
{
foreach(IPStreamPairHashtable.IPStreamPair ipsp in streamsAndIPs.Values)
{
if( ipsp.stream != null )
{
ipsp.stream.AddReceiverReport(cpb);
}
}
}
}
#if USE_APP_PACKET
// andrew: Add an app packet that reflects the time and the current venue...
if ((VenueName != null) && (this.groupEP != null))
{
string appPayload = VenueName + "#" + this.groupEP.Address.ToString();
long time = DateTime.Now.Ticks;
// 8 bytes for time + venue name
int count = 8 + utf8.GetByteCount(appPayload);
// count must be 4-byte alligned
int mod = count % 4;
if (mod != 0)
{
count += (4 - mod);
}
BufferChunk buffer = new BufferChunk(count);
buffer.Reset(0, count);
buffer.Clear();
buffer.SetInt64(0, time);
buffer.SetUTF8String(8, appPayload);
byte[] rawBytes = buffer.Buffer;
cpb.Add_APPReport(participant.SSRC, Rtcp.APP_PACKET_NAME, Rtcp.VENUE_APP_PACKET_SUBTYPE, rawBytes);
}
#endif
return cpb;
}