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static STATUS Android_PrepareAudioBuffers(void) {
   STATUS errCode;
   SLresult result;
   _slBufferQueueItf = NULL;
   /* Obtain interface to the AudioBufferQueue object */
   result = (*_slRecorderInstance)->GetInterface(_slRecorderInstance, SL_IID_ANDROIDSIMPLEBUFFERQUEUE,
            &_slBufferQueueItf);

   if( result != SL_RESULT_SUCCESS ) {
      LOGE("%s - Error calling _slRecorderInstance->GetInterface(SL_IID_ANDROIDSIMPLEBUFFERQUEUE)", __func__);
      errCode = S_ERR_OPENSLES_GET_INTERFACE;
      goto fail_point;
   }

   /* Register buffer-ready call-back */
   result = (*_slBufferQueueItf)->RegisterCallback(_slBufferQueueItf, Android_RecordCallback, NULL);
   if( result != SL_RESULT_SUCCESS ) {
      LOGE("%s - Error calling _slBufferQueueItf->RegisterCallback()", __func__);
      errCode = S_ERR_OPENSLES_REGISTER_CALLBACK;
      goto fail_point;
   }

   /* Specify an event mask to ensure the callback fires only when an audio buffer is full */
   (*_slRecorderItf)->SetCallbackEventsMask(_slRecorderItf, SL_RECORDEVENT_BUFFER_FULL);

   _activeBuffIdx = 0;
   /* Initialize buffer queue by enqueing all buffers at once.
    When a buffer is filled, it is dequeued and the registered call-back is called
    The buffer should be re-enqueued when processed to implement circular-buffer-list
    functionality */

   int i;
   for( i = 0; i < RECORD_BUFFER_COUNT; i++ ) {
      result = (*_slBufferQueueItf)->Enqueue(_slBufferQueueItf, _buffers[i], _buffSz);
      if( result != SL_RESULT_SUCCESS ) {
         LOGE("%s - Error calling_slBufferQueueItf->Enqueue()", __func__);
         errCode = S_ERR_OPENSLES_ENQUEUE_BUFF;
         goto fail_point;
      }
   }
   return S_OK;
fail_point:
   // rollback state
   if( _slBufferQueueItf ) {
      (*_slBufferQueueItf)->RegisterCallback(_slBufferQueueItf, NULL, NULL);
      (*_slBufferQueueItf)->Clear(_slBufferQueueItf);
      _slBufferQueueItf = NULL;
   }
   return errCode;
}

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