/** @since Available in iOS 4.0 and later. */
 public CVImageBufferChromaSubsampling getChromaSubsampling() {
   if (has(CVImageBufferAttribute.ChromaSubsampling)) {
     CFString val = get(CVImageBufferAttribute.ChromaSubsampling, CFString.class);
     return CVImageBufferChromaSubsampling.valueOf(val);
   }
   return null;
 }