feat(rtcstats): send facial expressions to rtcstats-server (#10461)

* send facial expressions to rtcstats

* remove comment

* remove extra line

react/features/rtcstats/RTCStats.js

@@ -95,6 +95,16 @@ class RTCStats {
         this.trace && this.trace.statsEntry('dominantSpeaker', null, dominantSpeakerData);
     }
 
+    /**
+     * Send facial expression data, the data will be processed by rtcstats-server and saved in the dump file.
+     *
+     * @param {Object} facialExpressionData - Facial expression data to be saved in the rtcstats dump.
+     * @returns {void}
+     */
+    sendFacialExpressionData(facialExpressionData) {
+        this.trace && this.trace.statsEntry('facialExpression', null, facialExpressionData);
+    }
+
     /**
      * Connect to the rtcstats server instance. Stats (data obtained from getstats) won't be send until the
      * connect successfully initializes, however calls to GUM are recorded in an internal buffer even if not

react/features/rtcstats/middleware.js

@@ -7,6 +7,7 @@ import { CONFERENCE_UNIQUE_ID_SET, getConferenceOptions, getRoomName } from '../
 import { LIB_WILL_INIT } from '../base/lib-jitsi-meet';
 import { DOMINANT_SPEAKER_CHANGED, getLocalParticipant } from '../base/participants';
 import { MiddlewareRegistry } from '../base/redux';
+import { ADD_FACIAL_EXPRESSION } from '../facial-recognition/actionTypes';
 
 import RTCStats from './RTCStats';
 import { canSendRtcstatsData, isRtcstatsEnabled } from './functions';
@@ -104,6 +105,17 @@ MiddlewareRegistry.register(store => next => action => {
         }
         break;
     }
+    case ADD_FACIAL_EXPRESSION: {
+        if (canSendRtcstatsData(state)) {
+            const { duration, facialExpression } = action;
+
+            RTCStats.sendFacialExpressionData({
+                duration,
+                facialExpression
+            });
+        }
+        break;
+    }
     }
 
     return next(action);