Android AudioTrack PCM Testing

package yoga1290.jjack;



import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.nio.ByteBuffer;
import java.nio.ShortBuffer;

import android.app.Activity;
import android.media.AudioManager;
import android.media.AudioTrack;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class Jjack extends Activity implements OnClickListener {
    /** Called when the activity is first created. */
    Button play;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        play=new Button(this);
        play.setText("Play");
        play.setOnClickListener(this);
        setContentView(play);

//        setContentView(R.layout.main);
    }

    @Override
    public void onClick(View arg0) {

          //  new AudioSynth01();
        //A buffer to hold two seconds monaural and one
  // second stereo data at 16000 samp/sec for
  // 16-bit samples
  byte audioData[] = new byte[16000*4];
  //The following are audio format parameters.
  // They may be modified by the signal generator
  // at runtime.  Values allowed by Java
  // SDK 1.4.1 are shown in comments.
  //TODO
  float sampleRate =8000.0F;// 16000.0F;
  //Allowable 8000,11025,16000,22050,44100

//  int sampleSizeInBits = 16;
  //Allowable 8,16

  // int channels = 1;
  //Allowable 1,2
  //Each channel requires two 8-bit bytes per
    // 16-bit sample.
    int bytesPerSamp = 2;






 // boolean signed = true;
  //Allowable true,false

//  boolean bigEndian = true;
  //Allowable true,false


    ByteBuffer byteBuffer = ByteBuffer.wrap(audioData);
    ShortBuffer shortBuffer = byteBuffer.asShortBuffer();

    int byteLength = audioData.length;
    int sampLength = byteLength/bytesPerSamp;
    for(int cnt = 0; cnt < sampLength; cnt++){
      double time = cnt/sampleRate;
      double freq = 20000F;//950.0;//arbitrary frequency
      double sinValue =
        (Math.sin(2*Math.PI*freq*time) +
        Math.sin(2*Math.PI*(freq/1.8)*time) +
        Math.sin(2*Math.PI*(freq/1.5)*time))/3.0;
      shortBuffer.put((short)(16000*sinValue));
    }


          try{
      //Get an input stream on the byte array
      // containing the data
      InputStream byteArrayInputStream =
                        new ByteArrayInputStream(audioData);

      //Get the required audio format
//      AudioFormat audioFormat =
//        new AudioFormat(
//                                sampleRate,
//                                sampleSizeInBits,
//                                channels,
//                                signed,
//                                bigEndian);

      AudioTrack track= new AudioTrack( AudioManager.STREAM_MUSIC,
                (int)sampleRate,
                android.media.AudioFormat.CHANNEL_CONFIGURATION_MONO,
                android.media.AudioFormat.ENCODING_PCM_16BIT,

                android.media.AudioTrack.getMinBufferSize( (int)sampleRate,
                        android.media.AudioFormat.CHANNEL_CONFIGURATION_STEREO,
                        android.media.AudioFormat.ENCODING_PCM_16BIT ),
                AudioTrack.MODE_STREAM );
      track.play();
      int cnt;
      byte buff[]=new byte[1024];
      while((cnt=byteArrayInputStream.read(buff))>0)
          track.write(buff, 0, cnt);

          }catch (Exception e) {
    }//end catch
        // TODO code application logic here
    }
}