AudioInput.java

gistfile1.java

import java.io.*;
import java.io.BufferedWriter;
import java.text.*;
import java.util.*;
import javax.sound.sampled.*;

public class AudioInput implements Runnable{

	public static void main(String args[]) {
		AudioInput audioinput = new AudioInput();
		Thread audioThread = new Thread(audioinput);
		audioThread.start();
	}

	private int calculateRMSLevel(byte[] audioData){
	// audioData might be buffered data read from a data line
	
		long lSum = 0;
		for(int i=0; i<audioData.length; i++){
			lSum = lSum + audioData[i];
		}
		double dAvg = lSum / audioData.length;
		double sumMeanSquare = 0d;
		for(int j=0; j<audioData.length; j++){
			sumMeanSquare = sumMeanSquare + Math.pow(audioData[j] - dAvg, 2d);
		}
		double averageMeanSquare = sumMeanSquare / audioData.length;
		return (int)(Math.pow(averageMeanSquare,0.5d) + 0.5);
	}

	public void run(){
		_audioData = new byte[20000];
		_csvFile = new File("sound_level.csv");
		try{
			int iLinVol = 0;
			double dAveVol = 0;
			int[] iVolume = new int[20];
			int i = 0;
			boolean full = false;
			int currentVolume;

			AudioFormat linearFormat = new AudioFormat(8000, 16, 1, true, false);
			DataLine.Info info = new DataLine.Info(TargetDataLine.class, linearFormat);
			TargetDataLine targetDataLine = (TargetDataLine)AudioSystem.getLine(info);
			targetDataLine.open(linearFormat);
			targetDataLine.start();
			AudioInputStream linearStream = new AudioInputStream(targetDataLine);
	

			while(true){
				linearStream.read(_audioData,0,_audioData.length);

				if(calculateRMSLevel(_audioData) > 0.0){
			        	Date date = new Date();
			        	SimpleDateFormat sdf = new SimpleDateFormat("HH':'mm':'ss");
			        	String sTime = sdf.format(date);

			        	try{
						currentVolume = calculateRMSLevel(_audioData);
						iVolume[i] = currentVolume;
//System.out.println(iVolume[i]);
						i++;
						if(i == 20){
							full = true;
							i = 0;
						}
						
						if(full){

							// calculate average		

							double iTotal = 0;
							for(int j=0; j<20; j++){
								iTotal = iTotal + iVolume[j];
							}
							dAveVol = iTotal/20.0;
// System.out.println(dAveVol);

							// calculate Standard Deviation
							
							iTotal = 0;
							for(int k=0; k<20; k++){
								iTotal += (iVolume[k]-dAveVol)*(iVolume[k]-dAveVol);
							}
							double dDist = iTotal/20;
							double dStan = Math.sqrt(dDist);
System.out.println(dStan);
							if(currentVolume > dAveVol + 0.5 * dDist) {
								System.out.println("kehai");
							}
							
						}
				 		_bw = new BufferedWriter(new FileWriter(_csvFile, true));
				 		_bw.write(sTime+","+currentVolume);
				    		_bw.newLine(); 
				    		_bw.flush();
					}catch (IOException e){
				  		e.printStackTrace();
					}
				}

				//targetDataLine.stop();
				//targetDataLine.close();
			}
	   	}catch (Exception e){
			e.printStackTrace();
                }
	}

    private byte[] _audioData;
    private BufferedWriter _bw; 
    private File _csvFile;
}

// end of MitsubajaExciteInput.java