Initial commit for seeking

RCTVideo.m

@@ -9,6 +9,7 @@
 NSString *const RNVideoEventLoaded = @"videoLoaded";
 NSString *const RNVideoEventLoading = @"videoLoading";
 NSString *const RNVideoEventProgress = @"videoProgress";
+NSString *const RNVideoEventSeek = @"videoSeek";
 NSString *const RNVideoEventLoadingError = @"videoLoadError";
 
 static NSString *const statusKeyPath = @"status";
@@ -23,6 +24,10 @@ static NSString *const statusKeyPath = @"status";
   /* Required to publish events */
   RCTEventDispatcher *_eventDispatcher;
 
+  bool _pendingSeek;
+  float _pendingSeekTime;
+  float _lastSeekTime;
+
   /* For sending videoProgress events */
   id _progressUpdateTimer;
   int _progressUpdateInterval;
@@ -39,6 +44,10 @@ static NSString *const statusKeyPath = @"status";
     _eventDispatcher = eventDispatcher;
     _rate = 1.0;
     _volume = 1.0;
+
+    _pendingSeek = false;
+    _pendingSeekTime = 0.0f;
+    _lastSeekTime = 0.0f;
   }
   return self;
 }
@@ -169,8 +178,7 @@ static NSString *const statusKeyPath = @"status";
   _playerLayer.videoGravity = mode;
 }
 
-- (void)setPaused:(BOOL)paused
-{
+- (void)setPaused:(BOOL)paused {
   if (paused) {
     [self stopProgressTimer];
     [_player pause];
@@ -181,14 +189,54 @@ static NSString *const statusKeyPath = @"status";
   }
 }
 
-- (void)setRate:(float)rate
-{
+- (void)setSeek:(NSDictionary*)seek {
+  NSNumber *seekValue = [seek objectForKey:@"time"];
+  if (!seekValue) {
+    return;
+  }
+  
+  int timeScale = 10000;
+  float seekTime = [RCTConvert float:seekValue];
+  bool force = [RCTConvert BOOL:[seek objectForKey:@"force"]];
+
+  if (seekTime == _lastSeekTime && !force) {
+    return;
+  }
+
+  AVPlayerItem *item = _player.currentItem;
+  if (item && item.status == AVPlayerItemStatusReadyToPlay) {
+    // TODO check loadedTimeRanges
+
+    CMTime cmSeekTime = CMTimeMakeWithSeconds(seekTime, timeScale);
+    CMTime current = item.currentTime;
+    // TODO figure out a good tolerance level
+    CMTime tolerance = CMTimeMake(1000, timeScale);
+    
+    if (CMTimeCompare(current, cmSeekTime) != 0) {
+      [_player seekToTime:cmSeekTime toleranceBefore:tolerance toleranceAfter:tolerance];
+      _pendingSeek = false;
+      _lastSeekTime = seekTime;
+      [_eventDispatcher sendInputEventWithName:RNVideoEventSeek body:@{
+        @"currentTime": [NSNumber numberWithFloat:CMTimeGetSeconds(item.currentTime)],
+        @"seekTime": seekValue,
+        @"target": self.reactTag
+      }];
+    }
+
+  } else {
+    // TODO see if this makes sense and if so,
+    // actually implement it
+    _pendingSeek = true;
+    _pendingSeekTime = seekTime;
+  }
+}
+
+- (void)setRate:(float)rate {
   _rate = rate;
   [self applyModifiers];
 }
 
-- (void)setMuted:(BOOL)muted
-{
+- (void)setMuted:(BOOL)muted {
   _muted = muted;
   [self applyModifiers];
 }
@@ -198,8 +246,7 @@ static NSString *const statusKeyPath = @"status";
   [self applyModifiers];
 }
 
-- (void)applyModifiers
-{
+- (void)applyModifiers {
   /* volume must be set to 0 if muted is YES, or the video freezes playback */
   if (_muted) {
     [_player setVolume:0];