// when can a certian ammount of data be sent?
CTimerValue CPacketBufferStats::GetPacketSendTime(SLONG slSize)
{
CTimerValue tvNow = _pTimer->GetHighPrecisionTimer();
// calculate how much should the packet be delayed due to latency and due to bandwidth
CTimerValue tvBandwidth;
if (pbs_fBandwidthLimit<=0.0f) {
tvBandwidth = CTimerValue(0.0);
} else {
tvBandwidth = CTimerValue(DOUBLE((slSize*8)/pbs_fBandwidthLimit));
}
CTimerValue tvLatency;
if (pbs_fLatencyLimit<=0.0f && pbs_fLatencyVariation<=0.0f) {
tvLatency = CTimerValue(0.0);
} else {
tvLatency = CTimerValue(DOUBLE(pbs_fLatencyLimit+(pbs_fLatencyVariation*rand())/RAND_MAX));
}
// time when the packet should be sent is max of
CTimerValue tvStart(
Max(
// current time plus latency and
(tvNow+tvLatency).tv_llValue,
// next free point in time
pbs_tvTimeNextPacketStart.tv_llValue));
// remember next free time and return it
pbs_tvTimeNextPacketStart = tvStart+tvBandwidth;
return pbs_tvTimeNextPacketStart;
};
// get time when block of given size will be finished if started now
CTimerValue CBlockBufferStats::GetBlockFinalTime(SLONG slSize)
{
CTimerValue tvNow = _pTimer->GetHighPrecisionTimer();
// calculate how much should block be delayed due to latency and due to bandwidth
CTimerValue tvBandwidth;
if (bbs_fBandwidthLimit<=0.0f) {
tvBandwidth = CTimerValue(0.0);
} else {
tvBandwidth = CTimerValue(DOUBLE((slSize*8)/bbs_fBandwidthLimit));
}
CTimerValue tvLatency;
if (bbs_fLatencyLimit<=0.0f && bbs_fLatencyVariation<=0.0f) {
tvLatency = CTimerValue(0.0);
} else {
tvLatency = CTimerValue(DOUBLE(bbs_fLatencyLimit+(bbs_fLatencyVariation*rand())/RAND_MAX));
}
// start of packet receiving is later of
CTimerValue tvStart(
Max(
// current time plus latency and
(tvNow+tvLatency).tv_llValue,
// next free point in time
bbs_tvTimeUsed.tv_llValue));
// remember next free time and return it
bbs_tvTimeUsed = tvStart+tvBandwidth;
return bbs_tvTimeUsed;
}
