- (void)returnFramebufferToCache:(GPUImageFramebuffer *)framebuffer;
{
    [framebuffer clearAllLocks];
    
//    dispatch_async(framebufferCacheQueue, ^{
    runAsynchronouslyOnVideoProcessingQueue(^{
        CGSize framebufferSize = framebuffer.size;
        GPUTextureOptions framebufferTextureOptions = framebuffer.textureOptions;
        NSString *lookupHash = [self hashForSize:framebufferSize textureOptions:framebufferTextureOptions onlyTexture:framebuffer.missingFramebuffer];
        NSNumber *numberOfMatchingTexturesInCache = [framebufferTypeCounts objectForKey:lookupHash];
        NSInteger numberOfMatchingTextures = [numberOfMatchingTexturesInCache integerValue];
        
        NSString *textureHash = [NSString stringWithFormat:@"%@-%ld", lookupHash, (long)numberOfMatchingTextures];
        
//        [framebufferCache setObject:framebuffer forKey:textureHash cost:round(framebufferSize.width * framebufferSize.height * 4.0)];
        [framebufferCache setObject:framebuffer forKey:textureHash];
        [framebufferTypeCounts setObject:[NSNumber numberWithInteger:(numberOfMatchingTextures + 1)] forKey:lookupHash];
    });
}

- (void)purgeAllUnassignedFramebuffers;
{
    runAsynchronouslyOnVideoProcessingQueue(^{
//    dispatch_async(framebufferCacheQueue, ^{
        [framebufferCache removeAllObjects];
        [framebufferTypeCounts removeAllObjects];
#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
        CVOpenGLESTextureCacheFlush([[GPUImageContext sharedImageProcessingContext] coreVideoTextureCache], 0);
#else
#endif
    });
}

- (void)addFramebufferToActiveImageCaptureList:(GPUImageFramebuffer *)framebuffer;
{
    runAsynchronouslyOnVideoProcessingQueue(^{
//    dispatch_async(framebufferCacheQueue, ^{
        [activeImageCaptureList addObject:framebuffer];
    });
}

- (void)removeFramebufferFromActiveImageCaptureList:(GPUImageFramebuffer *)framebuffer;
{
    runAsynchronouslyOnVideoProcessingQueue(^{
//  dispatch_async(framebufferCacheQueue, ^{
        [activeImageCaptureList removeObject:framebuffer];
    });
}