I've seen posts regarding problems with the AudioRecord
OnRecordPositionUpdateListener, but I haven't seen any real answers.
I'm using AudioRecord to record from the mic, and I want to get the
input from the mic periodically so I can check sound levels and update
a meter. I set up the listener like this:
private OnRecordPositionUpdateListener mRecordListener = new
AudioRecord.OnRecordPositionUpdateListener()
{
public void onPeriodicNotification(AudioRecord recorder) {
if
(recorder.getRecordingState()!=aRecorder.RECORDSTATE_STOPPED)
{
mAudioBuffer = new short[8000];
mSamplesRead = recorder.read(mAudioBuffer, 0,
8000);
if (mSamplesRead > 0)
{
// do something
}
}
}
public void onMarkerReached(AudioRecord recorder)
{
if
(recorder.getRecordingState()!=aRecorder.RECORDSTATE_STOPPED)
{
mAudioBuffer = new short[8000];
mSamplesRead = recorder.read(mAudioBuffer, 0,
8000);
}
}
};
I instantiate the AudioRecord object like this:
// audioSource = MediaRecorder.AudioSource.MIC
// sampleRate = 16000
// channelConfig = AudioFormat.CHANNEL_IN_MONO
// audioFormat = AudioFormat.ENCODING_PCM_16BIT
// bufferSize = 409600
aRecorder = new AudioRecord(audioSource, sampleRate,
channelConfig,
audioFormat, bufferSize);
if (aRecorder.getState() !=
AudioRecord.STATE_INITIALIZED)
throw new Exception("AudioRecord initialization
failed");
aRecorder.setRecordPositionUpdateListener(mRecordListener);
aRecorder.setPositionNotificationPeriod(400);
aRecorder.setNotificationMarkerPosition(400);
What happens is that onMarkerReached gets called once, after the
recorder is released, so that's not very useful.
Do I need to change the marker position and notification period? Is
the listener working? Is there another way to accomplish periodically
getting the mic input?
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