statistic reporting

[lu-zero]

If #53 wants to be more or less compatible with the reference implementation API, it might be good to support extracting the same statistics.

// Performance monitor with Byte counters for better bitrate estimation.
int srt_bstats(SRTSOCKET u, SRT_TRACEBSTATS * perf, int clear);

// Performance monitor with Byte counters and instantaneous stats instead of moving averages for Snd/Rcvbuffer sizes.
int srt_bistats(SRTSOCKET u, SRT_TRACEBSTATS * perf, int clear, int instantaneous);

With SRT_TRACEBSTATS containing the following:

Statistic	Type of Statistic	Unit of Measurement	Available for Sender	Available for Receiver	Data Type	Completed
msTimeStamp	accumulated	ms (milliseconds)	✓	✓	int64_t
pktSentTotal	accumulated	packets	✓	-	int64_t
pktRecvTotal	accumulated	packets	-	✓	int64_t
pktSentUniqueTotal	accumulated	packets	✓	-	int64_t
pktRecvUniqueTotal	accumulated	packets	-	✓	int64_t
pktSndLossTotal	accumulated	packets	✓	-	int32_t
pktRcvLossTotal	accumulated	packets	-	✓	int32_t
pktRetransTotal	accumulated	packets	✓	-	int32_t
pktRcvRetransTotal	accumulated	packets	-	✓	int32_t
pktSentACKTotal	accumulated	packets	-	✓	int32_t
pktRecvACKTotal	accumulated	packets	✓	-	int32_t
pktSentNAKTotal	accumulated	packets	-	✓	int32_t
pktRecvNAKTotal	accumulated	packets	✓	-	int32_t
usSndDurationTotal	accumulated	us (microseconds)	✓	-	int64_t
pktSndDropTotal	accumulated	packets	✓	-	int32_t
pktRcvDropTotal	accumulated	packets	-	✓	int32_t
pktRcvUndecryptTotal	accumulated	packets	-	✓	int32_t
pktSndFilterExtraTotal	accumulated	packets	✓	-	int32_t
pktRcvFilterExtraTotal	accumulated	packets	-	✓	int32_t
pktRcvFilterSupplyTotal	accumulated	packets	-	✓	int32_t
pktRcvFilterLossTotal	accumulated	packets	-	✓	int32_t
byteSentTotal	accumulated	bytes	✓	-	uint64_t
byteRecvTotal	accumulated	bytes	-	✓	uint64_t
byteSentUniqueTotal	accumulated	bytes	✓	-	uint64_t
byteRecvUniqueTotal	accumulated	bytes	-	✓	uint64_t
byteRcvLossTotal	accumulated	bytes	-	✓	uint64_t
byteRetransTotal	accumulated	bytes	✓	-	uint64_t
byteSndDropTotal	accumulated	bytes	✓	-	uint64_t
byteRcvDropTotal	accumulated	bytes	-	✓	uint64_t
byteRcvUndecryptTotal	accumulated	bytes	-	✓	uint64_t
pktSent	interval-based	packets	✓	-	int64_t
pktRecv	interval-based	packets	-	✓	int64_t
pktSentUnique	interval-based	packets	✓	-	int64_t
pktRecvUnique	interval-based	packets	-	✓	int64_t
pktSndLoss	interval-based	packets	✓	-	int32_t
pktRcvLoss	interval-based	packets	-	✓	int32_t
pktRetrans	interval-based	packets	✓	-	int32_t
pktRcvRetrans	interval-based	packets	-	✓	int32_t
pktSentACK	interval-based	packets	-	✓	int32_t
pktRecvACK	interval-based	packets	✓	-	int32_t
pktSentNAK	interval-based	packets	-	✓	int32_t
pktRecvNAK	interval-based	packets	✓	-	int32_t
pktSndFilterExtra	interval-based	packets	✓	-	int32_t
pktRcvFilterExtra	interval-based	packets	-	✓	int32_t
pktRcvFilterSupply	interval-based	packets	-	✓	int32_t
pktRcvFilterLoss	interval-based	packets	-	✓	int32_t
mbpsSendRate	interval-based	Mbps	✓	-	double
mbpsRecvRate	interval-based	Mbps	-	✓	double
usSndDuration	interval-based	us (microseconds)	✓	-	int64_t
pktReorderDistance	interval-based	packets	-	✓	int32_t
pktRcvBelated	interval-based	packets	-	✓	int64_t
pktSndDrop	interval-based	packets	✓	-	int32_t
pktRcvDrop	interval-based	packets	-	✓	int32_t
pktRcvUndecrypt	interval-based	packets	-	✓	int32_t
byteSent	interval-based	bytes	✓	-	uint64_t
byteRecv	interval-based	bytes	-	✓	uint64_t
byteSentUnique	interval-based	bytes	✓	-	uint64_t
byteRecvUnique	interval-based	bytes	-	✓	uint64_t
byteRcvLoss	interval-based	bytes	-	✓	uint64_t
byteRetrans	interval-based	bytes	✓	-	uint64_t
byteSndDrop	interval-based	bytes	✓	-	uint64_t
byteRcvDrop	interval-based	bytes	-	✓	uint64_t
byteRcvUndecrypt	interval-based	bytes	-	✓	uint64_t
usPktSndPeriod	instantaneous	us (microseconds)	✓	-	double
pktFlowWindow	instantaneous	packets	✓	-	int32_t
pktCongestionWindow	instantaneous	packets	✓	-	int32_t
pktFlightSize	instantaneous	packets	✓	-	int32_t
msRTT	instantaneous	ms (milliseconds)	✓	✓	double
mbpsBandwidth	instantaneous	Mbps	✓	✓	double
byteAvailSndBuf	instantaneous	bytes	✓	-	int32_t
byteAvailRcvBuf	instantaneous	bytes	-	✓	int32_t
mbpsMaxBW	instantaneous	Mbps	✓	-	double
byteMSS	instantaneous	bytes	✓	✓	int32_t
pktSndBuf	instantaneous	packets	✓	-	int32_t
byteSndBuf	instantaneous	bytes	✓	-	int32_t
msSndBuf	instantaneous	ms (milliseconds)	✓	-	int32_t
msSndTsbPdDelay	instantaneous	ms (milliseconds)	✓	-	int32_t
pktRcvBuf	instantaneous	packets	-	✓	int32_t
byteRcvBuf	instantaneous	bytes	-	✓	int32_t
msRcvBuf	instantaneous	ms (milliseconds)	-	✓	int32_t
msRcvTsbPdDelay	instantaneous	ms (milliseconds)	-	✓	int32_t
pktReorderTolerance	instantaneous	packets	-	✓	int32_t
pktRcvAvgBelatedTime	instantaneous	ms (milliseconds)	-	✓	double

[russelltg]

Related to #54

Thanks for the list, I added checkmarks to track these.

I think I'm going to go the route of the EventReceiver trait in #54 (not fully implemented, and that branch is a bit stale), which I would expect that there would also be a "default" implementation that provides these statistics

I also very much assume this relies on the currently unimplemented NAKREPORT SRT packet

[robertream]

@russelltg you might want to reopen this, we aren't done with implementing all of the statistics.

[russelltg]

Thanks, was just blindly linking issues apparently :)