how can i play pcm file

Question

The following code should record audio and store it in to SD card in PCM format. the code is working with me ,but the PCM file doesn't play !!!!

I got this code from this link.... Android : recording audio using audiorecord class play as fast forwarded

I need to play the PCM file How can i do that ??????

public class Audio_Record extends Activity {
private static final int RECORDER_SAMPLERATE = 8000;
private static final int RECORDER_CHANNELS = AudioFormat.CHANNEL_IN_MONO;
private static final int RECORDER_AUDIO_ENCODING = AudioFormat.ENCODING_PCM_16BIT;
private AudioRecord recorder = null;
private Thread recordingThread = null;
private boolean isRecording = false;

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

setButtonHandlers();
enableButtons(false);

int bufferSize = AudioRecord.getMinBufferSize(RECORDER_SAMPLERATE,
        RECORDER_CHANNELS, RECORDER_AUDIO_ENCODING);

System.out.println("BUFFER SIZE VALUE IS " + bufferSize);

 }

       private void setButtonHandlers() {
 ((Button) findViewById(R.id.btnStart)).setOnClickListener(btnClick);
((Button) findViewById(R.id.btnStop)).setOnClickListener(btnClick);
    }

   private void enableButton(int id, boolean isEnable) {
((Button) findViewById(id)).setEnabled(isEnable);
    }

private void enableButtons(boolean isRecording) {
enableButton(R.id.btnStart, !isRecording);
enableButton(R.id.btnStop, isRecording);
   }

  int BufferElements2Rec = 1024; // want to play 2048 (2K) since 2 bytes we
                            // use only 1024
  int BytesPerElement = 2; // 2 bytes in 16bit format

   private void startRecording() {

recorder = new AudioRecord(MediaRecorder.AudioSource.MIC,
        RECORDER_SAMPLERATE, RECORDER_CHANNELS,
        RECORDER_AUDIO_ENCODING, BufferElements2Rec * BytesPerElement);

recorder.startRecording();
isRecording = true;

recordingThread = new Thread(new Runnable() {

      public void run() {

        writeAudioDataToFile();

    }
}, "AudioRecorder Thread");
recordingThread.start();
    }

private byte[] short2byte(short[] sData) {
int shortArrsize = sData.length;
byte[] bytes = new byte[shortArrsize * 2];

for (int i = 0; i < shortArrsize; i++) {
    bytes[i * 2] = (byte) (sData[i] & 0x00FF);
    bytes[(i * 2) + 1] = (byte) (sData[i] >> 8);
    sData[i] = 0;
}
return bytes;

  }

  private void writeAudioDataToFile() {
// Write the output audio in byte

String filePath = "/sdcard/voice8K16bitmono.pcm";
short sData[] = new short[BufferElements2Rec];

FileOutputStream os = null;
try {
    os = new FileOutputStream(filePath);
} catch (FileNotFoundException e) {
    e.printStackTrace();
}

while (isRecording) {
    // gets the voice output from microphone to byte format

    recorder.read(sData, 0, BufferElements2Rec);
    System.out.println("Short wirting to file" + sData.toString());
    try {
        // // writes the data to file from buffer
        // // stores the voice buffer

        byte bData[] = short2byte(sData);

        os.write(bData, 0, BufferElements2Rec * BytesPerElement);
    } catch (IOException e) {
        e.printStackTrace();
    }
}

try {
    os.close();
} catch (IOException e) {
    e.printStackTrace();
}
}

private void stopRecording() {
// stops the recording activity
if (null != recorder) {
    isRecording = false;

    recorder.stop();
    recorder.release();

    recorder = null;
    recordingThread = null;
}
 }

private View.OnClickListener btnClick = new View.OnClickListener() {
public void onClick(View v) {
    switch (v.getId()) {
    case R.id.btnStart: {
        enableButtons(true);
        startRecording();
        break;
    }
    case R.id.btnStop: {
        enableButtons(false);
        stopRecording();
        break;
    }
    }
}
 };

  @Override
  public boolean onKeyDown(int keyCode, KeyEvent event) {

if (keyCode == KeyEvent.KEYCODE_BACK) {

    finish();
}
return super.onKeyDown(keyCode, event);
 }
}

Answer 1

Android's media player by default doesn't play PCM files. Either

1. Copy it from your SD card to your computer and play it there
2. Write your own player using AudioTrack
3. Install an app that plays PCM

Here's a tutorial on how to play PCM using the AudioTrack class: (http://jongladwin.blogspot.co.uk/2010/03/android-play-pcmwav-audio-buffer-using.html)

Windows Media Player should be able to play PCM, some alternatives are mentioned here: (http://www.makeuseof.com/answers/play-pcm-file-pc/)

I guess most of the big music player apps on Android will support PCM.