added an onCaptionsDeviceSettings event

Video.js

@@ -151,6 +151,12 @@ export default class Video extends Component {
     }
   };
 
+  _onCaptionsDeviceSetting = (event) => {
+    if (this.props.onCaptionsDeviceSetting) {
+      this.props.onCaptionsDeviceSetting(event.nativeEvent);
+    }
+  };
+
   _onPlaybackStalled = (event) => {
     if (this.props.onPlaybackStalled) {
       this.props.onPlaybackStalled(event.nativeEvent);
@@ -241,6 +247,7 @@ export default class Video extends Component {
       onVideoFullscreenPlayerWillDismiss: this._onFullscreenPlayerWillDismiss,
       onVideoFullscreenPlayerDidDismiss: this._onFullscreenPlayerDidDismiss,
       onReadyForDisplay: this._onReadyForDisplay,
+      onCaptionsDeviceSetting: this._onCaptionsDeviceSetting,
       onPlaybackStalled: this._onPlaybackStalled,
       onPlaybackResume: this._onPlaybackResume,
       onPlaybackRateChange: this._onPlaybackRateChange,
@@ -379,6 +386,7 @@ Video.propTypes = {
   onFullscreenPlayerWillDismiss: PropTypes.func,
   onFullscreenPlayerDidDismiss: PropTypes.func,
   onReadyForDisplay: PropTypes.func,
+  onCaptionsDeviceSetting: PropTypes.func,
   onPlaybackStalled: PropTypes.func,
   onPlaybackResume: PropTypes.func,
   onPlaybackRateChange: PropTypes.func,

ios/Video/RCTVideo.h

@@ -32,6 +32,7 @@
 @property (nonatomic, copy) RCTBubblingEventBlock onVideoFullscreenPlayerWillDismiss;
 @property (nonatomic, copy) RCTBubblingEventBlock onVideoFullscreenPlayerDidDismiss;
 @property (nonatomic, copy) RCTBubblingEventBlock onReadyForDisplay;
+@property (nonatomic, copy) RCTBubblingEventBlock onCaptionsDeviceSetting;
 @property (nonatomic, copy) RCTBubblingEventBlock onPlaybackStalled;
 @property (nonatomic, copy) RCTBubblingEventBlock onPlaybackResume;
 @property (nonatomic, copy) RCTBubblingEventBlock onPlaybackRateChange;

ios/Video/RCTVideo.m

@@ -68,6 +68,7 @@ static int const RCTVideoUnset = -1;
 #if __has_include(<react-native-video/RCTVideoCache.h>)
   RCTVideoCache * _videoCache;
 #endif
+  BOOL _deviceCaptionsEnabled;
 }
 
 - (instancetype)initWithEventDispatcher:(RCTEventDispatcher *)eventDispatcher
@@ -364,6 +365,12 @@ static int const RCTVideoUnset = -1;
                                     @"target": self.reactTag
                                 });
       }
+
+      if (self.onCaptionsDeviceSetting) {
+        self.onCaptionsDeviceSetting(@{@"deviceCaptionsEnabled": [NSNumber numberWithBool:_deviceCaptionsEnabled],
+                                     @"target": self.reactTag
+                                     });
+      }
     }];
   });
   _videoLoadStarted = YES;
@@ -966,9 +973,7 @@ static int const RCTVideoUnset = -1;
   
   // in the situation that a selected text track is not available (eg. specifies a textTrack not available)
   if (![type isEqualToString:@"disabled"] && selectedTrackIndex == RCTVideoUnset) {
-    CFArrayRef captioningMediaCharacteristics = MACaptionAppearanceCopyPreferredCaptioningMediaCharacteristics(kMACaptionAppearanceDomainUser);
-    NSArray *captionSettings = (__bridge NSArray*)captioningMediaCharacteristics;
-    if ([captionSettings containsObject:AVMediaCharacteristicTranscribesSpokenDialogForAccessibility]) {
+    if (_deviceCaptionsEnabled) {
       selectedTrackIndex = 0; // If we can't find a match, use the first available track
       NSString *systemLanguage = [[NSLocale preferredLanguages] firstObject];
       for (int i = 0; i < textTracks.count; ++i) {

ios/Video/RCTVideoManager.m

@@ -54,6 +54,7 @@ RCT_EXPORT_VIEW_PROPERTY(onVideoFullscreenPlayerDidPresent, RCTBubblingEventBloc
 RCT_EXPORT_VIEW_PROPERTY(onVideoFullscreenPlayerWillDismiss, RCTBubblingEventBlock);
 RCT_EXPORT_VIEW_PROPERTY(onVideoFullscreenPlayerDidDismiss, RCTBubblingEventBlock);
 RCT_EXPORT_VIEW_PROPERTY(onReadyForDisplay, RCTBubblingEventBlock);
+RCT_EXPORT_VIEW_PROPERTY(onCaptionsDeviceSetting, RCTBubblingEventBlock);
 RCT_EXPORT_VIEW_PROPERTY(onPlaybackStalled, RCTBubblingEventBlock);
 RCT_EXPORT_VIEW_PROPERTY(onPlaybackResume, RCTBubblingEventBlock);
 RCT_EXPORT_VIEW_PROPERTY(onPlaybackRateChange, RCTBubblingEventBlock);