/// <summary>
/// Processes specified RTP packet thorugh this stream.
/// </summary>
/// <param name="packet">RTP packet.</param>
/// <param name="size">RTP packet size in bytes.</param>
/// <exception cref="ArgumentNullException">Is raised when <b>packet</b> is null reference.</exception>
internal void Process(RTP_Packet packet, int size)
{
if (packet == null)
{
throw new ArgumentNullException("packet");
}
m_BytesReceived += size;
if (UpdateSeq(packet.SeqNo))
{
OnPacketReceived(packet);
/* RFC 3550 A.8 Estimating the Interarrival Jitter.
* The code fragments below implement the algorithm given in Section
* 6.4.1 for calculating an estimate of the statistical variance of the
* RTP data interarrival time to be inserted in the interarrival jitter
* field of reception reports. The inputs are r->ts, the timestamp from
* the incoming packet, and arrival, the current time in the same units.
* Here s points to state for the source; s->transit holds the relative
* transit time for the previous packet, and s->jitter holds the
* estimated jitter. The jitter field of the reception report is
* measured in timestamp units and expressed as an unsigned integer, but
* the jitter estimate is kept in a floating point. As each data packet
* arrives, the jitter estimate is updated:
*
* int transit = arrival - r->ts;
* int d = transit - s->transit;
* s->transit = transit;
* if (d < 0) d = -d;
* s->jitter += (1./16.) * ((double)d - s->jitter);
*
* When a reception report block (to which rr points) is generated for
* this member, the current jitter estimate is returned:
*
* rr->jitter = (u_int32) s->jitter;
*
*/
uint arrival = RTP_Utils.DateTimeToNTP32(DateTime.Now);
int transit = (int)(arrival - packet.Timestamp);
int d = transit - m_Transit;
m_Transit = transit;
if (d < 0)
{
d = -d;
}
m_Jitter += (1.0 / 16.0) * (d - m_Jitter);
}
// else Packet not valid, skip it.
}
/// <summary>
/// Generates new SSRC value. This must be called only if SSRC collision of local source.
/// </summary>
internal void GenerateNewSSRC()
{
m_SSRC = RTP_Utils.GenerateSSRC();
}