Java Sound API - capturing microphone

Question

I have been reading up on the Sound API for Java for a couple of days I am unable to make sense of it. I am decent programmer, I just having difficulty getting my head around the API.

I have been trying to capture audio from my microphone and display a wave graph in real time.

I am having trouble capturing audio, they say in the tutorial to do this, but I cant seem to get it to work.

Any suggestions and help would be much appreciated, a line by line answer would be ideal.

Please and thank you.

import javax.sound.sampled.AudioFormat; import javax.sound.sampled.AudioSystem; import javax.sound.sampled.DataLine; import javax.sound.sampled.LineUnavailableException; import javax.sound.sampled.TargetDataLine;  public class FindLine {   public static void main (String[] args){    AudioFormat format = new AudioFormat(22000,16,2,true,true);   TargetDataLine line;   DataLine.Info info = new DataLine.Info(TargetDataLine.class,        format); // format is an AudioFormat object   if (!AudioSystem.isLineSupported(info)) {       // Handle the error ...    }   // Obtain and open the line.   try {       line = (TargetDataLine) AudioSystem.getLine(info);       line.open(format);   } catch (LineUnavailableException ex) {       // Handle the error ...    }  }  } 

Answer 1

This will get you the default one set by your OS.

AudioFormat format = new AudioFormat(8000.0f, 16, 1, true, true); TargetDataLine microphone = AudioSystem.getTargetDataLine(format); 

To select a particular input device (TargetDataLine) it is better to enumerate the mixers and filter the name of the Mixer you want.

 Mixer.Info[] mixerInfos = AudioSystem.getMixerInfo();  for (Mixer.Info info: mixerInfos){   Mixer m = AudioSystem.getMixer(info);   Line.Info[] lineInfos = m.getSourceLineInfo();   for (Line.Info lineInfo:lineInfos){    System.out.println (info.getName()+"---"+lineInfo);    Line line = m.getLine(lineInfo);    System.out.println("\t-----"+line);   }   lineInfos = m.getTargetLineInfo();   for (Line.Info lineInfo:lineInfos){    System.out.println (m+"---"+lineInfo);    Line line = m.getLine(lineInfo);    System.out.println("\t-----"+line);    }   }