feat: add ts to StepDetector

pasada-lib/include/step_detector.h

@@ -12,8 +12,8 @@
 
 class StepListener {
 public:
-    virtual ~StepListener() {}
-    virtual void playBeat() = 0;
+    virtual ~StepListener() = default;
+    virtual void playBeat(double t) = 0;
 };
 
 /** mean-filter the gravity vector, then take acceleration downwards */
@@ -55,8 +55,13 @@ protected:
 
 public:
     StepDetector(double fps, StepListener *listener, bool debug = false);
+    /**
+     * Push accelerometer values.
+     * @param ts timestamp in ns
+     * @param values acceleration values for x,y,z
+     */
     void filter(double ts, std::vector<float> values);
-    void filter_a(double s1);
+    void filter_a(double t, double s1);
     std::vector<double> getBufSsd();
     std::vector<double> getBufSqi();
     std::vector<double> getBufOut();