From a10ed70b7b71b7c72e8885da52065d959af3505b Mon Sep 17 00:00:00 2001
From: Bent Bisballe Nyeng <deva@aasimon.org>
Date: Sat, 10 Apr 2021 17:54:34 +0200
Subject: Amortize the perceived sample power of normalized vs non-normalized
 samples.

---
 src/Makefile.am       | 2 +-
 src/inputprocessor.cc | 5 ++++-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/Makefile.am b/src/Makefile.am
index b656f48..6278ecb 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -36,7 +36,7 @@ libdg_la_CPPFLAGS = \
 	$(SNDFILE_CFLAGS) $(PTHREAD_CFLAGS)
 
 libdg_la_LIBADD = \
-	$(SNDFILE_LIBS) $(PTHREAD_LIBS) libzr.la libpugi.la
+	$(SNDFILE_LIBS) $(PTHREAD_LIBS) libzr.la libpugi.la -lm
 
 libdg_la_SOURCES = \
 	audiocachefile.cc \
diff --git a/src/inputprocessor.cc b/src/inputprocessor.cc
index 4bafb1d..19e76a5 100644
--- a/src/inputprocessor.cc
+++ b/src/inputprocessor.cc
@@ -27,6 +27,7 @@
 #include "inputprocessor.h"
 
 #include <list>
+#include <cmath>
 
 #include <hugin.hpp>
 
@@ -285,7 +286,9 @@ bool InputProcessor::processOnset(event_t& event, std::size_t pos,
 			event_sample.offset = (event.offset + pos) * resample_ratio;
 			if(settings.normalized_samples.load() && sample->getNormalized())
 			{
-				event_sample.scale *= event.velocity;
+				// To amortize with the non-normalized perceived sample power
+				// the velocity is square-rooted.
+				event_sample.scale *= std::sqrt(event.velocity);
 			}
 		}
 	}
-- 
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