使用mediacodec即时录制和播放声音

Question

我正在尝试使用mediacodec lib在我的设备上即时录制和播放声音。我知道我应该录制声音，然后传递它作为字节流播放。我很困惑，怎么办？ 谁能帮我？如果是，请用代码解释。

我的代码与mediarecord：

    import android.media.AudioFormat;
    import android.media.AudioManager;
    import android.media.AudioRecord;
    import android.media.AudioTrack;
    import android.media.MediaRecorder;
    import android.util.Log;

    public class Speak {
    //static final int bufferSize = 200000;
    //final short[] buffer = new short[bufferSize];
    //short[] readBuffer = new short[bufferSize];
    private boolean isRecording;
    private AudioRecord arec;
    private AudioTrack atrack;
    public void run() {
         isRecording = true;
                 android.os.Process.setThreadPriority(android.os.Process.THREAD_PRIORITY_URGENT_AUDIO);
         int buffersize = AudioRecord.getMinBufferSize(44100,     AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT);
       Log.d("buffer",String.valueOf(buffersize));
         buffersize +=5000;
         arec = new AudioRecord(MediaRecorder.AudioSource.MIC, 44100, AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT, buffersize);
         atrack = new AudioTrack(AudioManager.STREAM_MUSIC, 44100, AudioFormat.CHANNEL_OUT_MONO, AudioFormat.ENCODING_PCM_16BIT, buffersize, AudioTrack.MODE_STREAM);
         atrack.setPlaybackRate(44100);
        byte[] buffer = new byte[buffersize];
         arec.startRecording();
        atrack.play();
               while(isRecording) {
                   arec.read(buffer, 0, buffersize);
                   atrack.write(buffer, 0, buffer.length);
                   }
         } 
}