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Prevent unnecessary locking when generating a placeholder image on a background thread

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This commit is contained in:
Eric Jensen
2016-04-26 19:44:53 -07:00
parent e3817ac42d
commit fcf4a4d112
1 changed files with 3 additions and 3 deletions
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6
AsyncDisplayKit/ASVideoNode.mm
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@@ -173,16 +173,16 @@ static NSString * const kStatus = @"status";
- (void)imageAtTime:(CMTime)imageTime completionHandler:(void(^)(UIImage *image))completionHandler
{
ASPerformBlockOnBackgroundThread(^{
ASDN::MutexLocker l(_videoLock);
AVAsset *asset = self.asset;
// Skip the asset image generation if we don't have any tracks available that are capable of supporting it
NSArray<AVAssetTrack *>* visualAssetArray = [_asset tracksWithMediaCharacteristic:AVMediaCharacteristicVisual];
NSArray<AVAssetTrack *>* visualAssetArray = [asset tracksWithMediaCharacteristic:AVMediaCharacteristicVisual];
if (visualAssetArray.count == 0) {
completionHandler(nil);
return;
}
AVAssetImageGenerator *previewImageGenerator = [AVAssetImageGenerator assetImageGeneratorWithAsset:_asset];
AVAssetImageGenerator *previewImageGenerator = [AVAssetImageGenerator assetImageGeneratorWithAsset:asset];
previewImageGenerator.appliesPreferredTrackTransform = YES;
[previewImageGenerator generateCGImagesAsynchronouslyForTimes:@[[NSValue valueWithCMTime:imageTime]]