Merge pull request #1109 from nfb-onf/master

iOS Side loading for captions and offline support

android-exoplayer/src/main/java/com/brentvatne/exoplayer/ReactExoplayerView.java

@@ -11,6 +11,7 @@ import android.text.TextUtils;
 import android.util.Log;
 import android.view.View;
 import android.view.Window;
+import android.view.accessibility.CaptioningManager;
 import android.widget.FrameLayout;
 
 import com.brentvatne.react.R;
@@ -68,6 +69,7 @@ import java.lang.Math;
 import java.util.Map;
 import java.lang.Object;
 import java.util.ArrayList;
+import java.util.Locale;
 
 @SuppressLint("ViewConstructor")
 class ReactExoplayerView extends FrameLayout implements
@@ -737,10 +739,11 @@ class ReactExoplayerView extends FrameLayout implements
 
         TrackGroupArray groups = info.getTrackGroups(index);
         int trackIndex = C.INDEX_UNSET;
+        trackSelector.setSelectionOverride(index, groups, null);
+
         if (TextUtils.isEmpty(type)) {
             // Do nothing
         } else if (type.equals("disabled")) {
-            trackSelector.setSelectionOverride(index, groups, null);
             return;
         } else if (type.equals("language")) {
             for (int i = 0; i < groups.length; ++i) {
@@ -760,9 +763,25 @@ class ReactExoplayerView extends FrameLayout implements
             }
         } else if (type.equals("index")) {
             trackIndex = value.asInt();
-        } else { // default. invalid type or "system"
+        } else { // default. Use system settings if possible
-            trackSelector.clearSelectionOverrides(index);
+            int sdk = android.os.Build.VERSION.SDK_INT;
-            return;
+            if (sdk>18 && groups.length>0) {
+                CaptioningManager captioningManager = (CaptioningManager) themedReactContext.getSystemService(Context.CAPTIONING_SERVICE);
+                if (captioningManager.isEnabled()) {
+                    // default is to take the first object
+                    trackIndex = 0;
+
+                    String locale = Locale.getDefault().getDisplayLanguage();
+                    for (int i = 0; i < groups.length; ++i) {
+                        Format format = groups.get(i).getFormat(0);
+                        if (format.language != null && format.language.equals(locale)) {
+                            trackIndex = i;
+                            break;
+                        }
+                    }
+                }
+            } else return;
+
         }
 
         if (trackIndex == C.INDEX_UNSET) {

ios/RCTVideo.m

@@ -3,6 +3,8 @@
 #import <React/RCTBridgeModule.h>
 #import <React/RCTEventDispatcher.h>
 #import <React/UIView+React.h>
+#include <MediaAccessibility/MediaAccessibility.h>
+#include <AVFoundation/AVFoundation.h>
 
 static NSString *const statusKeyPath = @"status";
 static NSString *const playbackLikelyToKeepUpKeyPath = @"playbackLikelyToKeepUp";
@@ -43,6 +45,7 @@ static NSString *const timedMetadata = @"timedMetadata";
   BOOL _paused;
   BOOL _repeat;
   BOOL _allowsExternalPlayback;
+  NSArray * _textTracks;
   NSDictionary * _selectedTextTrack;
   BOOL _playbackStalled;
   BOOL _playInBackground;
@@ -284,6 +287,10 @@ static NSString *const timedMetadata = @"timedMetadata";
   [self removePlayerLayer];
   [self removePlayerTimeObserver];
   [self removePlayerItemObservers];
+  
+  dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
+    
+    // perform on next run loop, otherwise other passed react-props may not be set
     _playerItem = [self playerItemForSource:source];
     [self addPlayerItemObservers];
     
@@ -304,7 +311,6 @@ static NSString *const timedMetadata = @"timedMetadata";
     
     [self addPlayerTimeObserver];
 
-  dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
     //Perform on next run loop, otherwise onVideoLoadStart is nil
     if(self.onVideoLoadStart) {
       id uri = [source objectForKey:@"uri"];
@@ -316,42 +322,95 @@ static NSString *const timedMetadata = @"timedMetadata";
                                         @"target": self.reactTag
                                         });
     }
+
   });
   _videoLoadStarted = YES;
 }
 
+- (NSURL*) urlFilePath:(NSString*) filepath {
+  NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
+  
+  NSString* relativeFilePath = [filepath lastPathComponent];
+  // the file may be multiple levels below the documents directory
+  NSArray* fileComponents = [filepath componentsSeparatedByString:@"Documents/"];
+  if (fileComponents.count>1) {
+    relativeFilePath = [fileComponents objectAtIndex:1];
+  }
+  
+  NSString *path = [paths.firstObject stringByAppendingPathComponent:relativeFilePath];
+  if ([[NSFileManager defaultManager] fileExistsAtPath:path]) {
+    return [NSURL fileURLWithPath:path];
+  }
+  return nil;
+}
+
 - (AVPlayerItem*)playerItemForSource:(NSDictionary *)source
 {
   bool isNetwork = [RCTConvert BOOL:[source objectForKey:@"isNetwork"]];
   bool isAsset = [RCTConvert BOOL:[source objectForKey:@"isAsset"]];
   NSString *uri = [source objectForKey:@"uri"];
   NSString *type = [source objectForKey:@"type"];
-  NSDictionary *headers = [source objectForKey:@"requestHeaders"];
   
-  NSURL *url = (isNetwork || isAsset) ?
+  AVURLAsset *asset;
-    [NSURL URLWithString:uri] :
+  NSMutableDictionary *assetOptions = [[NSMutableDictionary alloc] init];
-    [[NSURL alloc] initFileURLWithPath:[[NSBundle mainBundle] pathForResource:uri ofType:type]];
 
   if (isNetwork) {
-    NSMutableDictionary *assetOptions = [[NSMutableDictionary alloc]init];
     /* Per #1091, this is not a public API. We need to either get approval from Apple to use this
      * or use a different approach.
+    NSDictionary *headers = [source objectForKey:@"requestHeaders"];
     if ([headers count] > 0) {
       [assetOptions setObject:headers forKey:@"AVURLAssetHTTPHeaderFieldsKey"];
     }
     */
     NSArray *cookies = [[NSHTTPCookieStorage sharedHTTPCookieStorage] cookies];
     [assetOptions setObject:cookies forKey:AVURLAssetHTTPCookiesKey];
-
+    asset = [AVURLAsset URLAssetWithURL:[NSURL URLWithString:uri] options:assetOptions];
-    AVURLAsset *asset = [AVURLAsset URLAssetWithURL:url options:assetOptions];
+  } else if (isAsset) { //  assets on iOS have to be in the Documents folder
-    return [AVPlayerItem playerItemWithAsset:asset];
+    asset = [AVURLAsset URLAssetWithURL:[self urlFilePath:uri] options:nil];
+  } else { // file passed in through JS, or an asset in the Xcode project
+    asset = [AVURLAsset URLAssetWithURL:[[NSURL alloc] initFileURLWithPath:[[NSBundle mainBundle] pathForResource:uri ofType:type]] options:nil];
   }
-  else if (isAsset) {
+  
-    AVURLAsset *asset = [AVURLAsset URLAssetWithURL:url options:nil];
+  if (!_textTracks) {
     return [AVPlayerItem playerItemWithAsset:asset];
   }
   
-  return [AVPlayerItem playerItemWithURL:url];
+  // sideload text tracks
+  AVMutableComposition *mixComposition = [[AVMutableComposition alloc] init];
+  
+  AVAssetTrack *videoAsset = [asset tracksWithMediaType:AVMediaTypeVideo].firstObject;
+  AVMutableCompositionTrack *videoCompTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid];
+  [videoCompTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, videoAsset.timeRange.duration)
+                          ofTrack:videoAsset
+                           atTime:kCMTimeZero
+                            error:nil];
+
+  AVAssetTrack *audioAsset = [asset tracksWithMediaType:AVMediaTypeAudio].firstObject;
+  AVMutableCompositionTrack *audioCompTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid];
+  [audioCompTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, videoAsset.timeRange.duration)
+                          ofTrack:audioAsset
+                           atTime:kCMTimeZero
+                            error:nil];
+
+  for (int i = 0; i < _textTracks.count; ++i) {
+    AVURLAsset *textURLAsset;
+    NSString *textUri = [_textTracks objectAtIndex:i][@"uri"];
+    if ([[textUri lowercaseString] hasPrefix:@"http"]) {
+      textURLAsset = [AVURLAsset URLAssetWithURL:[NSURL URLWithString:textUri] options:assetOptions];
+    } else {
+      textURLAsset = [AVURLAsset URLAssetWithURL:[self urlFilePath:textUri] options:nil];
+    }
+    AVAssetTrack *textTrackAsset = [textURLAsset tracksWithMediaType:AVMediaTypeText].firstObject;
+    AVMutableCompositionTrack *textCompTrack = [mixComposition
+                                                addMutableTrackWithMediaType:AVMediaTypeText
+                                                preferredTrackID:kCMPersistentTrackID_Invalid];
+    [textCompTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, videoAsset.timeRange.duration)
+                               ofTrack:textTrackAsset
+                                atTime:kCMTimeZero
+                                 error:nil];
+  }
+
+  return [AVPlayerItem playerItemWithAsset:mixComposition];
 }
 
 - (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
@@ -363,7 +422,7 @@ static NSString *const timedMetadata = @"timedMetadata";
       if (items && ![items isEqual:[NSNull null]] && items.count > 0) {
         NSMutableArray *array = [NSMutableArray new];
         for (AVMetadataItem *item in items) {
-          NSString *value = item.value;
+          NSString *value = (NSString *)item.value;
           NSString *identifier = item.identifier;
           
           if (![value isEqual: [NSNull null]]) {
@@ -668,15 +727,91 @@ static NSString *const timedMetadata = @"timedMetadata";
 
 - (void)setSelectedTextTrack:(NSDictionary *)selectedTextTrack {
   _selectedTextTrack = selectedTextTrack;
-  NSString *type = selectedTextTrack[@"type"];
+  if (_textTracks) {
+    [self setSideloadedText];
+  } else {
+    [self setStreamingText];
+  }
+}
+
+- (void) setSideloadedText {
+  NSString *type = _selectedTextTrack[@"type"];
+  NSArray* textTracks = [self getTextTrackInfo];
+  
+  // The first few tracks will be audio & video track
+  int firstTextIndex = 0;
+  for (firstTextIndex = 0; firstTextIndex < _player.currentItem.tracks.count; ++firstTextIndex) {
+    if ([_player.currentItem.tracks[firstTextIndex].assetTrack hasMediaCharacteristic:AVMediaCharacteristicLegible]) {
+      break;
+    }
+  }
+  
+  int selectedTrackIndex = -1;
+  
+  if ([type isEqualToString:@"disabled"]) {
+    // Do nothing. We want to ensure option is nil
+  } else if ([type isEqualToString:@"language"]) {
+    NSString *selectedValue = _selectedTextTrack[@"value"];
+    for (int i = 0; i < textTracks.count; ++i) {
+      NSDictionary *currentTextTrack = [textTracks objectAtIndex:i];
+      if ([selectedValue isEqualToString:currentTextTrack[@"language"]]) {
+        selectedTrackIndex = i;
+        break;
+      }
+    }
+  } else if ([type isEqualToString:@"title"]) {
+    NSString *selectedValue = _selectedTextTrack[@"value"];
+    for (int i = 0; i < textTracks.count; ++i) {
+      NSDictionary *currentTextTrack = [textTracks objectAtIndex:i];
+      if ([selectedValue isEqualToString:currentTextTrack[@"title"]]) {
+        selectedTrackIndex = i;
+        break;
+      }
+    }
+  } else if ([type isEqualToString:@"index"]) {
+    if ([_selectedTextTrack[@"value"] isKindOfClass:[NSNumber class]]) {
+      int index = [_selectedTextTrack[@"value"] intValue];
+      if (textTracks.count > index) {
+        selectedTrackIndex = index;
+      }
+    }
+  }
+  
+  // user's selected language might not be available, or system defaults have captions enabled
+  if (selectedTrackIndex == -1 || [type isEqualToString:@"default"]) {
+      CFArrayRef captioningMediaCharacteristics = MACaptionAppearanceCopyPreferredCaptioningMediaCharacteristics(kMACaptionAppearanceDomainUser);
+      NSArray *captionSettings = (__bridge NSArray*)captioningMediaCharacteristics;
+      if ([captionSettings containsObject: AVMediaCharacteristicTranscribesSpokenDialogForAccessibility]) {
+        // iterate through the textTracks to find a matching option, or default to the first object.
+        selectedTrackIndex = 0;
+        
+        NSString * systemLanguage = [[NSLocale preferredLanguages] firstObject];
+        for (int i = 0; i < textTracks.count; ++i) {
+          NSDictionary *currentTextTrack = [textTracks objectAtIndex:i];
+          if ([systemLanguage isEqualToString:currentTextTrack[@"language"]]) {
+            selectedTrackIndex = i;
+            break;
+          }
+        }
+      }
+  }
+  
+  for (int i = firstTextIndex; i < _player.currentItem.tracks.count; ++i) {
+    BOOL isEnabled = i == selectedTrackIndex + firstTextIndex;
+    [_player.currentItem.tracks[i] setEnabled:isEnabled];
+  }
+}
+
+-(void) setStreamingText {
+  NSString *type = _selectedTextTrack[@"type"];
   AVMediaSelectionGroup *group = [_player.currentItem.asset
                                   mediaSelectionGroupForMediaCharacteristic:AVMediaCharacteristicLegible];
-  AVMediaSelectionOption *option;
+  AVMediaSelectionOption *mediaOption;
   
   if ([type isEqualToString:@"disabled"]) {
     // Do nothing. We want to ensure option is nil
   } else if ([type isEqualToString:@"language"] || [type isEqualToString:@"title"]) {
-    NSString *value = selectedTextTrack[@"value"];
+    NSString *value = _selectedTextTrack[@"value"];
     for (int i = 0; i < group.options.count; ++i) {
       AVMediaSelectionOption *currentOption = [group.options objectAtIndex:i];
       NSString *optionValue;
@@ -688,17 +823,17 @@ static NSString *const timedMetadata = @"timedMetadata";
                        objectAtIndex:0];
       }
       if ([value isEqualToString:optionValue]) {
-        option = currentOption;
+        mediaOption = currentOption;
         break;
       }
     }
     //} else if ([type isEqualToString:@"default"]) {
     //  option = group.defaultOption; */
   } else if ([type isEqualToString:@"index"]) {
-    if ([selectedTextTrack[@"value"] isKindOfClass:[NSNumber class]]) {
+    if ([_selectedTextTrack[@"value"] isKindOfClass:[NSNumber class]]) {
-      int index = [selectedTextTrack[@"value"] intValue];
+      int index = [_selectedTextTrack[@"value"] intValue];
       if (group.options.count > index) {
-        option = [group.options objectAtIndex:index];
+        mediaOption = [group.options objectAtIndex:index];
       }
     }
   } else { // default. invalid type or "system"
@@ -707,11 +842,24 @@ static NSString *const timedMetadata = @"timedMetadata";
   }
   
   // If a match isn't found, option will be nil and text tracks will be disabled
-  [_player.currentItem selectMediaOption:option inMediaSelectionGroup:group];
+  [_player.currentItem selectMediaOption:mediaOption inMediaSelectionGroup:group];
+}
+
+- (void)setTextTracks:(NSArray*) textTracks;
+{
+  _textTracks = textTracks;
+
+  // in case textTracks was set after selectedTextTrack
+  if (_selectedTextTrack) [self setSelectedTextTrack:_selectedTextTrack];
 }
 
 - (NSArray *)getTextTrackInfo
 {
+  
+  // if sideloaded, textTracks will already be set
+  if (_textTracks) return _textTracks;
+  
+  // if streaming video, we extract the text tracks
   NSMutableArray *textTracks = [[NSMutableArray alloc] init];
   AVMediaSelectionGroup *group = [_player.currentItem.asset
                                   mediaSelectionGroupForMediaCharacteristic:AVMediaCharacteristicLegible];

ios/RCTVideoManager.m

@@ -23,6 +23,7 @@ RCT_EXPORT_VIEW_PROPERTY(src, NSDictionary);
 RCT_EXPORT_VIEW_PROPERTY(resizeMode, NSString);
 RCT_EXPORT_VIEW_PROPERTY(repeat, BOOL);
 RCT_EXPORT_VIEW_PROPERTY(allowsExternalPlayback, BOOL);
+RCT_EXPORT_VIEW_PROPERTY(textTracks, NSArray);
 RCT_EXPORT_VIEW_PROPERTY(selectedTextTrack, NSDictionary);
 RCT_EXPORT_VIEW_PROPERTY(paused, BOOL);
 RCT_EXPORT_VIEW_PROPERTY(muted, BOOL);