kCVPixelBufferBytesPerRowAlignmentKey
kCVPixelBufferCGBitmapContextCompatibilityKey
kCVPixelBufferCGImageCompatibilityKey
kCVPixelBufferExtendedPixelsBottomKey
kCVPixelBufferExtendedPixelsLeftKey
kCVPixelBufferExtendedPixelsRightKey
kCVPixelBufferExtendedPixelsTopKey
kCVPixelBufferHeightKey
kCVPixelBufferIOSurfacePropertiesKey
kCVPixelBufferMemoryAllocatorKey
kCVPixelBufferOpenGLCompatibilityKey
kCVPixelBufferPixelFormatTypeKey
kCVPixelBufferPlaneAlignmentKey
kCVPixelBufferWidthKey