Initialize RTC library only once (#508)

* Initialize RTC library only once

* spotless and changeset

+---
+"client-sdk-android": patch
+---
+
+Initialize WebRTC library only once

@@ -64,6 +64,11 @@ typealias CapabilitiesGetter = @JvmSuppressWildcards (MediaStreamTrack.MediaType
 internal object RTCModule {
 
     /**
+     * To only be written to on the WebRTC thread.
+     */
+    private var hasInitializedWebrtc = false
+
+    /**
      * Certain classes require libwebrtc to be initialized prior to use.
      *
      * If your provision depends on libwebrtc initialization, just add it
@@ -86,6 +91,10 @@ internal object RTCModule {
     @Singleton
     @Named(InjectionNames.LIB_WEBRTC_INITIALIZATION)
     fun libWebrtcInitialization(appContext: Context): LibWebrtcInitialization {
+        if (!hasInitializedWebrtc) {
+            executeBlockingOnRTCThread {
+                if (!hasInitializedWebrtc) {
+                    hasInitializedWebrtc = true
                     PeerConnectionFactory.initialize(
                         PeerConnectionFactory.InitializationOptions
                             .builder(appContext)
@@ -112,6 +121,9 @@ internal object RTCModule {
                             )
                             .createInitializationOptions(),
                     )
+                }
+            }
+        }
         return LibWebrtcInitialization
     }