question: public static int calculateRMSLevel ( short [ ] audioData , int numframes ) { long lSum = 0 ; int numread = 0 ; for ( short s : audioData ) { lSum = lSum + s ; numread ++ ; if ( numread == numframes ) break ; } double dAvg = lSum / numframes ; double sumMeanSquare = 0d ; numread = 0 ; for ( short anAudioData : audioData ) { sumMeanSquare = sumMeanSquare + Math . pow ( anAudioData - dAvg , 2d ) ; numread ++ ; if ( numread == numframes ) break ; } double averageMeanSquare = sumMeanSquare / numframes ; return ( int ) ( Math . pow ( averageMeanSquare , 0.5d ) + 0.5 ) ; }
target:  Calculates the RMS audio level from the provided short sample extract