Add playableDuration property to onProgress event

RCTVideo.m

@@ -69,6 +69,7 @@ static NSString *const statusKeyPath = @"status";
      (([_prevProgressUpdateTime timeIntervalSinceNow] * -1000.0) >= _progressUpdateInterval)) {
     [_eventDispatcher sendInputEventWithName:RNVideoEventProgress body:@{
       @"currentTime": [NSNumber numberWithFloat:CMTimeGetSeconds(video.currentTime)],
+      @"playableDuration": [self calculatePlayableDuration],
       @"target": self.reactTag
     }];
 
@@ -76,6 +77,27 @@ static NSString *const statusKeyPath = @"status";
   }
 }
 
+/*!
+ * Calculates and returns the playable duration of the current player item using its loaded time ranges.
+ *
+ * \returns The playable duration of the current player item.
+ */
+- (NSNumber *)calculatePlayableDuration {
+  AVPlayerItem *video = _player.currentItem;
+  if (video.status == AVPlayerItemStatusReadyToPlay) {
+    __block CMTimeRange effectiveTimeRange;
+    [video.loadedTimeRanges enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
+      CMTimeRange timeRange = [obj CMTimeRangeValue];
+      if (CMTimeRangeContainsTime(timeRange, video.currentTime)) {
+        effectiveTimeRange = timeRange;
+        *stop = YES;
+      }
+    }];
+    return [NSNumber numberWithFloat:CMTimeGetSeconds(CMTimeRangeGetEnd(effectiveTimeRange))];
+  }
+  return [NSNumber numberWithFloat:CMTimeGetSeconds(kCMTimeInvalid)];
+}
+
 - (void)stopProgressTimer
 {
   [_progressUpdateTimer invalidate];