title: How to develop a Spectrum Analyser from a realtime audio?
body: <p>I am developing an app that get a source audio from mic in realtime, with no file storage. Basically, I use:</p>
  <pre><code>mRecorder = new MediaRecorder();
  mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
  mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
  mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
  mRecorder.setOutputFile(&quot;/dev/null&quot;);
  </code></pre>
  <p>How I can do a spectrum graphic from this realtime audio, with no files?</p>
  <p>All post that I read are analyzing a buffered file.</p>