Fix normalization of noise estimate in NoiseSuppressor

webrtc/modules/audio_processing/ns/noise_suppression_x.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 27 matching lines @@
 }
 
 void WebRtcNsx_Process(NsxHandle* nsxInst,
                       const short* const* speechFrame,
                       int num_bands,
                       short* const* outFrame) {
   WebRtcNsx_ProcessCore((NoiseSuppressionFixedC*)nsxInst, speechFrame,
                         num_bands, outFrame);
 }
 
-const uint32_t* WebRtcNsx_noise_estimate(const NsxHandle* nsxInst) {
+const uint32_t* WebRtcNsx_noise_estimate(const NsxHandle* nsxInst,
+                                         int* domain) {
+  *domain = 11;
   const NoiseSuppressionFixedC* self = (const NoiseSuppressionFixedC*)nsxInst;
   if (nsxInst == NULL || self->initFlag == 0) {
     return NULL;
   }
+  *domain += self->prevQNoise;

[peah-webrtc, 2016/03/31 20:50:57]

What is the Q value of prevNoiseU32? From the name I thought it would be
self->prevQNoise but the value in domain is self->prevQNoise+11

[aluebs-webrtc, 2016/04/01 01:52:42]

Yes, I agree that it is confusing, but it is in fact self->prevQNoise+11, which
can be seen in the documentation of nsx_core.

   return self->prevNoiseU32;
 }
 
 size_t WebRtcNsx_num_freq() {
   return HALF_ANAL_BLOCKL;
 }