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

webrtc/modules/audio_processing/ns/noise_suppression.c

Index: webrtc/modules/audio_processing/ns/noise_suppression.c
diff --git a/webrtc/modules/audio_processing/ns/noise_suppression.c b/webrtc/modules/audio_processing/ns/noise_suppression.c
index dd05e0ab3d7f905ca8f936d605e3bd90e0f78f46..5c826909188c0d96174a04413c1ec2d7e60e8641 100644
--- a/webrtc/modules/audio_processing/ns/noise_suppression.c
+++ b/webrtc/modules/audio_processing/ns/noise_suppression.c
@@ -57,3 +57,15 @@ float WebRtcNs_prior_speech_probability(NsHandle* handle) {
   }
   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;
+}