feat: add ts to StepDetector

pasada-lib/step_detector.cpp

@@ -65,11 +65,11 @@ void StepDetector::filter(double ts, std::vector<float> values) {
         // gravity filtering
         double a = f_grav.filter(samp);
         // pass on accel sample
-        filter_a(a);
+        filter_a(ts, a);
     }
 }
 
-void StepDetector::filter_a(double s2) {
+void StepDetector::filter_a(double ts, double s2) {
     auto s3 = f_ssf.filter(s2);
     auto s4 = f_ssd.filter(s3);
     auto q5 = f_sqi.filter(s2, s3, s4);
@@ -80,7 +80,7 @@ void StepDetector::filter_a(double s2) {
     }
     // is step, step quality is OK, and we have a listener?
     if(s4 > 0.0 && q5 > 0.0 && listener != nullptr) {
-        listener->playBeat();
+        listener->playBeat(ts / 1e9);
     }
 }