Sync audio session config

sdk/objc/components/audio/RTCAudioSession+Private.h

@@ -38,6 +38,8 @@ NS_ASSUME_NONNULL_BEGIN
 /** if the current category could allow recording */
 @property(nonatomic, assign) BOOL isRecordingEnabled;
 
+@property(nonatomic, strong) NSString *activeCategory;
+
 /** Adds the delegate to the list of delegates, and places it at the front of
  *  the list. This delegate will be notified before other delegates of
  *  audio events.

sdk/objc/components/audio/RTCAudioSession.mm

@@ -105,6 +105,8 @@ - (instancetype)initWithAudioSession:(id)audioSession {
 
     _isRecordingEnabled = [self sessionCategoryIsRecordingEnabled];
 
+    _activeCategory = _session.category;
+
     RTCLog(@"RTC_OBJC_TYPE(RTCAudioSession) (%p): init.", self);
   }
   return self;
@@ -494,9 +496,16 @@ - (void)handleRouteChangeNotification:(NSNotification *)notification {
     case AVAudioSessionRouteChangeReasonCategoryChange:
       RTCLog(@"Audio route changed: CategoryChange to :%@", self.session.category);
       {
-        BOOL newValue = [self sessionCategoryIsRecordingEnabled];
-        if (_isRecordingEnabled != newValue) {
-          _isRecordingEnabled = newValue;
+        // webRTCConfiguration is used by configureWebRTCSession
+        RTC_OBJC_TYPE(RTCAudioSessionConfiguration) *webRTCConfig = [RTC_OBJC_TYPE(RTCAudioSessionConfiguration) webRTCConfiguration];
+        webRTCConfig.category = _session.category;
+        webRTCConfig.categoryOptions = _session.categoryOptions;
+        webRTCConfig.mode = _session.mode;
+
+        if (![_session.category isEqualToString:_activeCategory]) {
+          _isRecordingEnabled = [self sessionCategoryIsRecordingEnabled];
+          _activeCategory = _session.category;
+          RTCLog(@"Audio route changed: Restarting Audio Unit");
           [self notifyDidChangeAudioSessionRecordingEnabled];
         }
       }

sdk/objc/components/audio/RTCAudioSessionConfiguration.m

@@ -65,15 +65,17 @@ @implementation RTC_OBJC_TYPE (RTCAudioSessionConfiguration)
 
 - (instancetype)init {
   if (self = [super init]) {
+    // Use AVAudioSession values for default
+    AVAudioSession *session = [AVAudioSession sharedInstance];
     // Use a category which supports simultaneous recording and playback.
     // By default, using this category implies that our app’s audio is
     // nonmixable, hence activating the session will interrupt any other
     // audio sessions which are also nonmixable.
-    _category = AVAudioSessionCategorySoloAmbient;
-    _categoryOptions = 0;
+    _category = session.category;
+    _categoryOptions = session.categoryOptions;
 
     // Specify mode for two-way voice communication (e.g. VoIP).
-    _mode = AVAudioSessionModeDefault;
+    _mode = session.mode;
 
     // Set the session's sample rate or the hardware sample rate.
     // It is essential that we use the same sample rate as stream format