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-rw-r--r--src/powerlist.cc14
1 files changed, 13 insertions, 1 deletions
diff --git a/src/powerlist.cc b/src/powerlist.cc
index 1888733..96f2c9b 100644
--- a/src/powerlist.cc
+++ b/src/powerlist.cc
@@ -32,6 +32,14 @@
#include <hugin.hpp>
+/**
+ * Minimum sample set size.
+ * Smaller means wider 'velocity groups'.
+ * Limited by sample set size, ie. only kicks in if sample set size is smaller
+ * than this number.
+ */
+#define MIN_SAMPLE_SET_SIZE 10
+
// Enable to calculate power on old samples without power attribute
//#define AUTO_CALCULATE_POWER
@@ -213,8 +221,12 @@ Sample *PowerList::get(level_t level)
float power_span = power_max - power_min;
+ // Width is limited to at least 10. Fioxes problem with instrument with a
+ // sample set smaller than MIN_SAMPLE_SET_SIZE.
+ float width = fmax(samples.size(), MIN_SAMPLE_SET_SIZE);
+
// Spread out at most 1.5 samples away from center
- float stddev = power_span / samples.size() * 1.5;
+ float stddev = power_span / width * 1.5;
// Cut off mean value with stddev/2 in both ends in order to make room for
// downwards expansion on velocity 0 and upwards expansion on velocity 1.