From ca0b9a3753fa3b42d4ac8183adcf30d957f55016 Mon Sep 17 00:00:00 2001
From: "Brad Payne (Vir Linden)" <vir@lindenlab.com>
Date: Tue, 9 Nov 2021 20:25:25 +0000
Subject: SL-16329 - track frame time and jitter (as average deviation frame to
 frame) in stats window

---
 indra/llcommon/lltracerecording.cpp | 27 ++++++++++++++++++++++++++-
 1 file changed, 26 insertions(+), 1 deletion(-)

(limited to 'indra/llcommon/lltracerecording.cpp')

diff --git a/indra/llcommon/lltracerecording.cpp b/indra/llcommon/lltracerecording.cpp
index c72a64d086..5ce1b337fe 100644
--- a/indra/llcommon/lltracerecording.cpp
+++ b/indra/llcommon/lltracerecording.cpp
@@ -858,7 +858,6 @@ F64 PeriodicRecording::getPeriodMean( const StatType<EventAccumulator>& stat, S3
 			: NaN;
 }
 
-
 F64 PeriodicRecording::getPeriodStandardDeviation( const StatType<EventAccumulator>& stat, S32 num_periods /*= S32_MAX*/ )
 {
     LL_PROFILE_ZONE_SCOPED;
@@ -952,6 +951,32 @@ F64 PeriodicRecording::getPeriodMean( const StatType<SampleAccumulator>& stat, S
 			: NaN;
 }
 
+F64 PeriodicRecording::getPeriodMedian( const StatType<SampleAccumulator>& stat, S32 num_periods /*= S32_MAX*/ )
+{
+    LL_PROFILE_ZONE_SCOPED;
+	num_periods = llmin(num_periods, getNumRecordedPeriods());
+
+	std::vector<F64> buf;
+	for (S32 i = 1; i <= num_periods; i++)
+	{
+		Recording& recording = getPrevRecording(i);
+		if (recording.getDuration() > (F32Seconds)0.f)
+		{
+			if (recording.hasValue(stat))
+			{
+				buf.push_back(recording.getMean(stat));
+			}
+		}
+	}
+	if (buf.size()==0)
+	{
+		return 0.0f;
+	}
+	std::sort(buf.begin(), buf.end());
+
+	return F64((buf.size() % 2 == 0) ? (buf[buf.size() / 2 - 1] + buf[buf.size() / 2]) / 2 : buf[buf.size() / 2]);
+}
+
 F64 PeriodicRecording::getPeriodStandardDeviation( const StatType<SampleAccumulator>& stat, S32 num_periods /*= S32_MAX*/ )
 {
     LL_PROFILE_ZONE_SCOPED;
-- 
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