Did you enable audio input in the emulator?
On Apr 23, 6:48 pm, Steven_T <gwb...@126.com> wrote:
> hi Dave Sparks:
> I have changed 50 frames to 400 frmaes, it doesn't work.
> then I set bufferSizeInBytes to 1000000 to init AudioRecord object,
> and set update period to 400,
> it dosn't work too. I had used logcat to watch emulator'log, didn't
> find this program pid throwed error,
> Can you give me sample?
> thanks
>
> On Apr 24, 1:10 am, Dave Sparks <davidspa...@android.com> wrote:
>
> > 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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