Only run audio detection when audio is above noise threshold (#7078)

* Only run audio detection when audio is above noise threshold

* Formatting

* Fix event parsing

* Update frigate/events/audio.py

Co-authored-by: Blake Blackshear <blakeb@blakeshome.com>

---------

Co-authored-by: Blake Blackshear <blakeb@blakeshome.com>

docs/docs/configuration/index.md

@@ -145,6 +145,12 @@ audio:
   enabled: False
   # Optional: Configure the amount of seconds without detected audio to end the event (default: shown below)
   max_not_heard: 30
+  # Optional: Configure the min rms volume required to run audio detection (default: shown below)
+  # As a rule of thumb:
+  #  - 200 - high sensitivity
+  #  - 500 - medium sensitivity
+  #  - 1000 - low sensitivity
+  min_volume: 500
   # Optional: Types of audio to listen for (default: shown below)
   listen:
     - bark

frigate/config.py

@@ -413,6 +413,9 @@ class AudioConfig(FrigateBaseModel):
     max_not_heard: int = Field(
         default=30, title="Seconds of not hearing the type of audio to end the event."
     )
+    min_volume: int = Field(
+        default=500, title="Min volume required to run audio detection."
+    )
     listen: List[str] = Field(
         default=DEFAULT_LISTEN_AUDIO, title="Audio to listen for."
     )

frigate/events/audio.py

@@ -169,14 +169,18 @@ class AudioEventMaintainer(threading.Thread):
         if not self.feature_metrics[self.config.name]["audio_enabled"].value:
             return
 
-        waveform = (audio / AUDIO_MAX_BIT_RANGE).astype(np.float32)
-        model_detections = self.detector.detect(waveform)
+        rms = np.sqrt(np.mean(np.absolute(np.square(audio.astype(np.float32)))))
 
-        for label, score, _ in model_detections:
-            if label not in self.config.audio.listen:
-                continue
+        # only run audio detection when volume is above min_volume
+        if rms >= self.config.audio.min_volume:
+            waveform = (audio / AUDIO_MAX_BIT_RANGE).astype(np.float32)
+            model_detections = self.detector.detect(waveform)
 
-            self.handle_detection(label, score)
+            for label, score, _ in model_detections:
+                if label not in self.config.audio.listen:
+                    continue
+
+                self.handle_detection(label, score)
 
         self.expire_detections()
 
@@ -192,7 +196,7 @@ class AudioEventMaintainer(threading.Thread):
             )
 
             if resp.status_code == 200:
-                event_id = resp.json()[0]["event_id"]
+                event_id = resp.json()["event_id"]
                 self.detections[label] = {
                     "id": event_id,
                     "label": label,