使用“音频录制”类录制音频，并使用“音频跟踪”类播放

Question

嗨，我尝试使用AudioRecord类通过MIC录制音频并将其存储在大小为2048的缓冲区中。

我尝试使用 AudioTrack 类从该缓冲区本身播放录制的音频，从而创建另一个相同大小的缓冲区。当我运行应用程序时，它显示我的主文件.xml并显示"不幸的是应用程序已停止"。它似乎没有记录任何东西。我只想播放来自录制缓冲区本身的音频。谁能帮我？这是我的代码。

public class Main extends Activity {
class AudRecord
{
    public AudioRecord recorder; 
    public boolean isRecording;
    public int SAMPLERATE;
    public int CHANNELS;
    public int AUDIO_FORMAT;
    public int buffer; 
    public Thread recordingThread;
    public AudRecord()
    {
        recorder = null;
        isRecording = false;
        SAMPLERATE = 44100;
        CHANNELS = AudioFormat.CHANNEL_IN_MONO;
        AUDIO_FORMAT = AudioFormat.ENCODING_PCM_16BIT;
        recordingThread = null;
        buffer = 2048;
    }
    public void StartRecording() {

        recorder = new AudioRecord(MediaRecorder.AudioSource.MIC, SAMPLERATE,
                CHANNELS, AUDIO_FORMAT, buffer);
        recorder.startRecording();
        isRecording = true;
        recordingThread = new Thread(new Runnable()
        {
            public void run() {
                writeAudioData();
            }
        });
        recordingThread.start();
    }

     void writeAudioData() {

        byte data[] = new byte[2048];
        while (isRecording) {
            recorder.read(data, 0, buffer);
            send(data);
        }
    }
    public void send(byte[] data) {
        int buffers = 2048;
        AudioTrack at = new AudioTrack(AudioManager.STREAM_MUSIC, 44100,
                AudioFormat.CHANNEL_OUT_MONO,
                AudioFormat.ENCODING_PCM_16BIT, buffers,
                AudioTrack.MODE_STREAM);
        at.play();
        at.write(data, 0, buffers);
        at.stop();
        at.release();
    }
}
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    AudRecord rec= new AudRecord();
    rec.StartRecording();
}

}

Answer 1

不幸的是，

应用程序已停止，这意味着您的XML文件有问题。

AudioRecording 使用MediaRecorder的示例

public class MainActivity extends Activity {
 MediaRecorder recorder = new MediaRecorder();
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
  ((Button) findViewById(R.id.btnStart)).setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        start();
    }
    });
 ((Button) findViewById(R.id.btnStop)).setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        stop();
    }
    });
    }
    public void start()
    {
        recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
        recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
        recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
        recorder.setOutputFile(Environment.getExternalStorageDirectory().getAbsolutePath()+"yourfilename.3gpp");
        recorder.prepare();
        recorder.start();
    }
    public void stop()
    {
        recorder.stop();
        recorder.reset();
        recorder.release();
    }
}