public AVAudioQuality getAudioQuality() {
   if (has(Keys.AudioQuality())) {
     NSNumber val = (NSNumber) get(Keys.AudioQuality());
     return AVAudioQuality.valueOf(val.longValue());
   }
   return null;
 }
 public AVSampleRateConverterSettings setAudioQuality(AVAudioQuality audioQuality) {
   set(Keys.AudioQuality(), NSNumber.valueOf(audioQuality.value()));
   return this;
 }