使用audio来录音，使用AudioTrack来播放，发现播放出来的声音是吱吱的那种杂音。这是怎么回事呢？

使用audio来录音，使用AudioTrack来播放，发现播放出来的声音是吱吱的那种杂音。这是怎么回事呢？

public class AudioPlayerDemoActivity extends Activity implements OnClickListener{
    /** Called when the activity is first created. */

private TextView mTextViewState; // 播放状态

private Button mBtnPlayButton; // 播放

private Button mBtnPauseButton; // 暂停

private Button mBtnStopButton; // 停止

private AudioPlayer mAudioPlayer; // 播放器

private Handler mHandler;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        initView();

        initLogic();
    }




    @Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();

mAudioPlayer.release();
}


public void initView()
    {
     mTextViewState = (TextView) findViewById(R.id.tvPlayState);

     mBtnPlayButton = (Button) findViewById(R.id.buttonPlay);
     mBtnPlayButton.setOnClickListener(this);

     mBtnPauseButton = (Button) findViewById(R.id.buttonPause);
     mBtnPauseButton.setOnClickListener(this);

     mBtnStopButton = (Button) findViewById(R.id.buttonStop);
     mBtnStopButton.setOnClickListener(this);
    }

    public void initLogic()
    {
     mHandler = new Handler()
     {

@Override
public void handleMessage(Message msg) {
// TODO Auto-generated method stub
switch(msg.what)
{
case AudioPlayer.STATE_MSG_ID:
showState((Integer)msg.obj);
break;
}
}


     };

     mAudioPlayer = new AudioPlayer(mHandler);

     // 获取音频参数
     AudioParam audioParam = getAudioParam();
     mAudioPlayer.setAudioParam(audioParam);

     // 获取音频数据
     byte[] data = getPCMData();
     mAudioPlayer.setDataSource(data);

     // 音频源就绪
     mAudioPlayer.prepare();

     if (data == null)
     {
     mTextViewState.setText(filePath + "：该路径下不存在文件！");
     }
    }

    @Override
public void onClick(View view) {
// TODO Auto-generated method stub
switch(view.getId())
{
case R.id.buttonPlay:
play();
break;
case R.id.buttonPause:
pause();
break;
case R.id.buttonStop:
stop();
break;
}
}

    public void play()
    {
     mAudioPlayer.play();
    }

    public void pause()
    {
     mAudioPlayer.pause();
    }

    public void stop()
    {
     mAudioPlayer.stop();
    }


    public void showState(int state)
    {
     String showString = "";

     switch(state)
     {
     case PlayState.MPS_UNINIT:
     showString = "MPS_UNINIT";
     break;
     case PlayState.MPS_PREPARE:
     showString = "MPS_PREPARE";
     break;
     case PlayState.MPS_PLAYING:
     showString = "MPS_PLAYING";
     break;
     case PlayState.MPS_PAUSE:
     showString = "MPS_PAUSE";
     break;
     }

     showState(showString);
    }


    public void showState(String str)
    {
     mTextViewState.setText(str);
    }



/*
     * 获得PCM音频数据参数
     */
public AudioParam getAudioParam()
{
AudioParam audioParam = new AudioParam();
     audioParam.mFrequency = 44100;
     audioParam.mChannel = AudioFormat.CHANNEL_CONFIGURATION_STEREO;
     audioParam.mSampBit = AudioFormat.ENCODING_PCM_16BIT;

     return audioParam;
}

String  filePath  = Environment.getExternalStorageDirectory().getAbsolutePath() + "/testmusic.pcm";
    /*
     * 获得PCM音频数据
     */
    public byte[] getPCMData()
    {

     File file = new File(filePath);
     if (file == null){
     return null;
     }

     FileInputStream inStream;
try {
inStream = new FileInputStream(file);
} catch (FileNotFoundException e) {
e.printStackTrace();
return null;
}

byte[] data_pack = null;
     if (inStream != null){
     long size = file.length();

     data_pack = new byte[(int) size];
     try {
inStream.read(data_pack);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return null;
}

     }

     return data_pack;
    }

} pcm

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