Exposed detection count in gvafpscounter for internal use

src/gst/elements/gvafpscounter/fpscounter.cpp

@@ -17,6 +17,8 @@
 #include <cmath>
 #include <numeric>
 
+#include <gst/analytics/analytics.h>
+
 namespace {
 constexpr double TIME_THRESHOLD = 0.1;
 using seconds_double = std::chrono::duration<double>;
@@ -35,6 +37,22 @@ bool IterativeFpsCounter::NewFrame(const std::string &element_name, FILE *output
     if (output == nullptr)
         return false;
 
+    // Count detected regions of interest
+    GstAnalyticsRelationMeta *relation_meta = gst_buffer_get_analytics_relation_meta(buffer);
+    if (relation_meta) {
+        gpointer state = NULL;
+        GstAnalyticsODMtd od_mtd;
+        size_t count = 0;
+
+        while (
+            gst_analytics_relation_meta_iterate(relation_meta, &state, gst_analytics_od_mtd_get_mtd_type(), &od_mtd)) {
+            ++count;
+        }
+
+        detections += count;
+    }
+
+
     auto now = std::chrono::high_resolution_clock::now();
     if (print_std_dev) {
         double millis = std::chrono::duration_cast<std::chrono::microseconds>(now - last_time).count() * MICRO_TO_MILLI;

src/gst/elements/gvafpscounter/fpscounter.h

@@ -29,7 +29,7 @@ class IterativeFpsCounter : public FpsCounter {
     IterativeFpsCounter(unsigned starting_frame, unsigned interval, bool average, bool print_std_dev,
                         bool print_latency)
         : starting_frame(starting_frame), interval(interval), average(average), print_each_stream(true),
-          total_frames(0), avg_fps(0.0), eos_result_reported(false), print_std_dev(print_std_dev),
+          total_frames(0), detections(0), avg_fps(0.0), eos_result_reported(false), print_std_dev(print_std_dev),
           print_latency(print_latency) {
     }
     bool NewFrame(const std::string &element_name, FILE *output, GstBuffer *buffer) override;
@@ -40,13 +40,18 @@ class IterativeFpsCounter : public FpsCounter {
         std::lock_guard<std::mutex> lock(mutex);
         return avg_fps;
     }
+    unsigned get_detections() {
+        std::lock_guard<std::mutex> lock(mutex);
+        return detections;
+    }
 
   protected:
     unsigned starting_frame;
     unsigned interval;
     bool average;
     bool print_each_stream;
     unsigned total_frames;
+    unsigned detections;
     float avg_fps;
     std::chrono::time_point<std::chrono::high_resolution_clock> init_time;
     std::chrono::time_point<std::chrono::high_resolution_clock> last_time;

src/gst/elements/gvafpscounter/fpscounter_c.cpp

@@ -89,8 +89,10 @@ void fps_counter_new_frame(GstBuffer *buffer, const char *element_name, void *gs
             counter->second->NewFrame(element_name, output, buffer);
             if (gstgvafpscounter && counter->first == "average") {
                 auto iterative_counter = std::dynamic_pointer_cast<IterativeFpsCounter>(counter->second);
-                if (iterative_counter)
+                if (iterative_counter) {
                     ((GstGvaFpscounter *)gstgvafpscounter)->avg_fps = iterative_counter->get_avg_fps();
+                    ((GstGvaFpscounter *)gstgvafpscounter)->detections = iterative_counter->get_detections();
+                }
             }
         }
     } catch (std::exception &e) {

src/gst/elements/gvafpscounter/gstgvafpscounter.c

@@ -34,7 +34,8 @@ enum {
     PROP_READ_PIPE,
     PROP_PRINT_STD_DEV,
     PROP_PRINT_LATENCY,
-    PROP_AVG_FPS
+    PROP_AVG_FPS,
+    PROP_DETECTIONS
 };
 
 #define DEFAULT_INTERVAL "1"
@@ -47,6 +48,9 @@ enum {
 #define DEFAULT_AVG_FPS 0.0
 #define DEFAULT_AVG_FPS_MIN 0.0
 #define DEFAULT_AVG_FPS_MAX G_MAXFLOAT
+#define DEFAULT_DETECTIONS 0
+#define DEFAULT_MIN_DETECTIONS 0
+#define DEFAULT_MAX_DETECTIONS UINT_MAX
 
 /* prototypes */
 static void gst_gva_fpscounter_set_property(GObject *object, guint property_id, const GValue *value, GParamSpec *pspec);
@@ -123,6 +127,11 @@ static void gst_gva_fpscounter_class_init(GstGvaFpscounterClass *klass) {
                                                        "The average frames per second, read-only parameter",
                                                        DEFAULT_AVG_FPS_MIN, DEFAULT_AVG_FPS_MAX, DEFAULT_AVG_FPS,
                                                        G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
+    g_object_class_install_property(gobject_class, PROP_DETECTIONS,
+                                    g_param_spec_uint("detections", "For internal use only",
+                                                       "For internal use only",
+                                                       DEFAULT_MIN_DETECTIONS, DEFAULT_MAX_DETECTIONS, DEFAULT_DETECTIONS,
+                                                       G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
 }
 
 static void gst_gva_fpscounter_init(GstGvaFpscounter *gva_fpscounter) {
@@ -137,6 +146,7 @@ static void gst_gva_fpscounter_init(GstGvaFpscounter *gva_fpscounter) {
     gva_fpscounter->print_std_dev = DEFAULT_PRINT_STD_DEV;
     gva_fpscounter->print_latency = DEFAULT_PRINT_LATENCY;
     gva_fpscounter->avg_fps = DEFAULT_AVG_FPS;
+    gva_fpscounter->detections = DEFAULT_DETECTIONS;
 }
 
 void gst_gva_fpscounter_get_property(GObject *object, guint property_id, GValue *value, GParamSpec *pspec) {
@@ -165,6 +175,9 @@ void gst_gva_fpscounter_get_property(GObject *object, guint property_id, GValue
     case PROP_AVG_FPS:
         g_value_set_float(value, gvafpscounter->avg_fps);
         break;
+    case PROP_DETECTIONS:
+        g_value_set_uint(value, gvafpscounter->detections);
+        break;
     default:
         G_OBJECT_WARN_INVALID_PROPERTY_ID(object, property_id, pspec);
         break;

src/gst/elements/gvafpscounter/gstgvafpscounter.h

@@ -26,6 +26,7 @@ struct _GstGvaFpscounter {
     GstBaseTransform base_gvafpscounter;
     gchar *interval;
     guint starting_frame;
+    guint detections;
     gfloat avg_fps;
     gchar *write_pipe;
     gchar *read_pipe;