I suspect the problem is the interval you chose: 50 frames @ 8KHz is
6.25 msecs. Your app is not going to be able to handle a callback
every 6.25 msecs. Try something more reasonable like 50 msecs (400
frames) and see if that works.
On Apr 23, 1:56 am, Steven_T <gwb...@126.com> wrote:
> hello everyone,
> I would like to use the new AudioRecord class to record in PCM format.
> Create class and setRecordPositionUpdateListener to it, then start
> recording, I can't get any notification from system forever,why?(I
> didn't get any error when running)
>
> please help me, thanks.
>
> the next is my code.
>
> public class Recorder {
> private static final int AUDIO_SAMPLE_FREQ = 8000;
> private static final int AUDIO_BUFFER_SIZE = 200000;
>
> private AudioRecord recorder;
>
> public Recorder()
> {
> try
> {
> // init recorder
> recorder = new
> AudioRecord(MediaRecorder.AudioSource.MIC,
> AUDIO_SAMPLE_FREQ,
>
> AudioFormat.CHANNEL_CONFIGURATION_MONO,
> AudioFormat.ENCODING_PCM_16BIT,
> AUDIO_BUFFER_SIZE);
> }
> catch (IllegalArgumentException e)
> {
> e.printStackTrace();
> }
>
> recorder.setRecordPositionUpdateListener(mNotification);
> recorder.setPositionNotificationPeriod(50);
> recorder.setNotificationMarkerPosition(AUDIO_SAMPLE_FREQ);
> }
>
> public OnRecordPositionUpdateListener mNotification = new
> OnRecordPositionUpdateListener(){
> public void onMarkerReached(AudioRecord arg0) {
> // read PCM buffer here
> byte[] audioBuffer = new byte[AUDIO_SAMPLE_FREQ];
> arg0.read(audioBuffer, 0, AUDIO_SAMPLE_FREQ);
> }
>
> public void onPeriodicNotification(AudioRecord arg0) {
> // read PCM buffer here
> byte[] audioBuffer = new byte[AUDIO_SAMPLE_FREQ];
> arg0.read(audioBuffer, 0, AUDIO_SAMPLE_FREQ);
> }
>
> public void StartRecord()
> {
> recorder.startRecording();
> }
>
> public void StopRecord()
> {
> recorder.stop();
> }
>
> public void ReleaseRecord()
> {
> recorder.release();
> }
>
> };
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