feat: check SQI before playing step sound

app/src/main/cpp/StepDetector.cpp

@@ -24,7 +24,8 @@ StepDetector::StepDetector(StepListener *listener) :
     f_highpass(hpf_taps_b, hpf_taps_a),
     f_neg(1, 0, 0, std::vector {-1.0}),
     f_ssf(upslope_width),
-    f_ssd(len_refr)
+    f_ssd(len_refr),
+    f_sqi(upslope_width)
 {}
 
 #if (FPS != 60)
@@ -38,7 +39,9 @@ void StepDetector::filter(std::vector<float> values) {
     auto s2 = f_neg.filter(s1);
     auto s3 = f_ssf.filter(s2);
     auto s4 = f_ssd.filter(s3);
-    if(s4 > 0.0 && listener != nullptr) {
+    auto q5 = f_sqi.filter(s2, s3, s4);
+    // is step, step quality is OK, and we have a listener?
+    if(s4 > 0.0 && q5 > 0.0 && listener != nullptr) {
         listener->playBeat();
     }
 }

app/src/main/cpp/StepDetector.h

@@ -17,6 +17,7 @@ protected:
     Filt f_neg;
     SsfFilter f_ssf;
     SsfStepDetector f_ssd;
+    RunningQualityFilter f_sqi;
 
 public:
     StepDetector(StepListener *listener);