I have written following code in which I am trying to record and play the
audio... But all I get is just the noise... Please help ...... I also want
to know why my UI thread hangs when I have a separate thread for
recording.....Thanks in advance..
/**
* @author amit
*
*/
public class AudioRecorder extends Activity {
private String LOG_TAG = null;
/* variables which are required to generate and manage the UI of the App */
// private RecordButton mRecordButton = null;
private Button recordBtn, stopBtn, playBtn;
/*
* variables which are required for the actual functioning of the recording
* and playing
*/
private AudioRecord recorder = null;
private AudioTrack player = null;
private int recorderBufSize, recordingSampleRate;
private int trackBufSize;
private byte[] audioData;
private boolean isRecording = false, isPlaying = false;
private Thread startRecThread;
private AudioRecord.OnRecordPositionUpdateListener posUpdateListener;
/**
* constructor method for initializing the variables
*/
public AudioRecorder() {
super();
LOG_TAG = "Constructor";
recorderBufSize = recordingSampleRate = trackBufSize = 0;
// init function will initialize all the necessary variables ...
init();
if (recorder != null && player != null) {
Log.e(LOG_TAG, "recorder and player initialized");
audioData = new byte[recorderBufSize];
} else {
Log.e(LOG_TAG, "Problem inside init function ");
}
posUpdateListener = new AudioRecord.OnRecordPositionUpdateListener() {
int bytesRead = 0;
@Override
public void onPeriodicNotification(AudioRecord recorder) {
// TODO Auto-generated method stub
// Log.e(LOG_TAG, "inside position listener");
bytesRead = recorder.read(audioData, 0, audioData.length);
player.write(audioData, 0, bytesRead);
}
@Override
public void onMarkerReached(AudioRecord recorder) {
// TODO Auto-generated method stub
Log.e(LOG_TAG, "Marker Reached");
}
};
// listener will be called every time 160 frames are reached
recorder.setPositionNotificationPeriod(160);
recorder.setRecordPositionUpdateListener(posUpdateListener);
startRecThread = new Thread() {
@Override
public void run() {
// TODO Auto-generated method stub
recorder.startRecording();
// Log.e(LOG_TAG, "running");
// while (recorder.getRecordingState() ==
AudioRecord.RECORDSTATE_RECORDING) {
recorder.read(audioData, 0, recorderBufSize);
// }
}
};
Log.e(LOG_TAG, "inside constructor");
}
private void init() {
LOG_TAG = "initFunc";
int[] mSampleRates = new int[] { 8000, 11025, 22050, 44100 };
short audioFormat = AudioFormat.ENCODING_PCM_16BIT;
for (int rate : mSampleRates) {
try {
Log.d(LOG_TAG, "Attempting rate " + rate + "Hz, bits: "
+ audioFormat);
int bufrSize = AudioRecord.getMinBufferSize(rate,
AudioFormat.CHANNEL_IN_MONO, audioFormat);
if (bufrSize != AudioRecord.ERROR_BAD_VALUE
&& bufrSize != AudioRecord.ERROR) {
// check if we can instantiate and have a success
AudioRecord rec = new AudioRecord(
MediaRecorder.AudioSource.MIC, rate,
AudioFormat.CHANNEL_IN_MONO, audioFormat, bufrSize);
if (rec != null
&& rec.getState() == AudioRecord.STATE_INITIALIZED) {
// storing variables for future use . . .
this.recordingSampleRate = rate;
this.recorderBufSize = bufrSize;
Log.e(LOG_TAG,
"Returning..(rate:channelConfig:audioFormat:bufferSize)"
+ rate + ":"
+ AudioFormat.CHANNEL_IN_MONO + ":"
+ audioFormat + ":" + bufrSize);
// Now create an instance of the AudioTrack
int audioTrackBufSize = AudioTrack
.getMinBufferSize(rate,
AudioFormat.CHANNEL_OUT_MONO,
audioFormat);
Log.e(LOG_TAG, "AudioTrack buf size :"
+ audioTrackBufSize);
this.trackBufSize = audioTrackBufSize;
this.player = new AudioTrack(AudioManager.STREAM_MUSIC,
rate, AudioFormat.CHANNEL_OUT_MONO,
audioFormat, audioTrackBufSize,
AudioTrack.MODE_STREAM);
this.recorder = rec;
return;
}
}
} catch (IllegalArgumentException e) {
Log.d(LOG_TAG, rate + "Exception, keep trying.", e);
} catch (Exception e) {
Log.e(LOG_TAG, rate + "Some Exception!!", e);
}
// for loop for channel config ended here. . . .
// for loop for audioFormat ended here. . .
}
return;
}
private void startPlaying() {
LOG_TAG = "startPlaying";
Log.e(LOG_TAG, "start Playing");
}
private void stopPlaying() {
LOG_TAG = "stopPlaying";
Log.e(LOG_TAG, "stop Playing");
}
private void startRecording() {
LOG_TAG = "startRecording";
player.play();
/* start a separate recording thread from here . . . */
startRecThread.start();
// recorder.read(audioData, 0, recorderBufSize);
Log.e(LOG_TAG, "start Recording");
}
private void stopRecording() {
LOG_TAG = "stopRecording";
if(startRecThread.isAlive())
startRecThread.stop();
recorder.stop();
player.stop();
Log.e(LOG_TAG, "stop Recording");
}
private void stop() {
if (isRecording) {
isRecording = false;
stopRecording();
}
if (isPlaying) {
isPlaying = false;
stopPlaying();
}
recordBtn.setEnabled(true);
playBtn.setEnabled(true);
}
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
LinearLayout ll = new LinearLayout(this);
// creating Buttons one by one . . . .
// button to start the recording process
recordBtn = new Button(this);
recordBtn.setText("Record");
recordBtn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
recordBtn.setEnabled(false);
playBtn.setEnabled(false);
isRecording = true;
startRecording();
}
});
// single button to stop recording and playing as applicable
stopBtn = new Button(this);
stopBtn.setText("Stop");
stopBtn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
stop();
}
});
// button to play the recorded sound
playBtn = new Button(this);
playBtn.setText("Play");
playBtn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
// reverse the isPlaying
isPlaying = true;
recordBtn.setEnabled(false);
playBtn.setEnabled(false);
startPlaying();
}
});
ll.addView(recordBtn, new LinearLayout.LayoutParams(
ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT, 1));
ll.addView(playBtn, new LinearLayout.LayoutParams(
ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT, 1));
ll.addView(stopBtn, new LinearLayout.LayoutParams(
ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT, 1));
setContentView(ll);
}
@Override
protected void onDestroy() {
// Clean up code . ..
super.onDestroy();
if(startRecThread.isAlive())
startRecThread.destroy();
if (recorder != null)
recorder.release();
if (player != null)
player.release();
startRecThread = null;
recorder = null;
player = null;
recordBtn = null;
stopBtn = null;
playBtn = null;
audioData = null;
System.gc();
}
}
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