Surface the noise estimate of the NS to be used by other components

webrtc/modules/audio_processing/ns/noise_suppression.c

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 39 matching lines @@
 float WebRtcNs_prior_speech_probability(NsHandle* handle) {
   NoiseSuppressionC* self = (NoiseSuppressionC*)handle;
   if (handle == NULL) {
     return -1;
   }
   if (self->initFlag == 0) {
     return -1;
   }
   return self->priorSpeechProb;
 }
+
+float* WebRtcNs_noise_estimate(NsHandle* handle) {
+  NoiseSuppressionC* self = (NoiseSuppressionC*)handle;
+  if (handle == NULL || self->initFlag == 0) {
+    return NULL;

[turaj, 2016/02/05 01:47:58]

Is NULL preferred over nullptr in WebRTC?

[aluebs-webrtc, 2016/02/06 00:12:28]

No, but nullptr is C++11 and this is a C file :) 

+  }
+  return self->noise;
+}
+
+size_t WebRtcNs_num_freq() {
+  return HALF_ANAL_BLOCKL;
+}