Fix normalization of noise estimate in NoiseSuppressor

webrtc/modules/audio_processing/ns/noise_suppression_x.h

 /*
  *  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 75 matching lines @@
 /* Returns a pointer to the noise estimate per frequency bin. The number of
  * frequency bins can be provided using WebRtcNsx_num_freq().
  *
  * Input
  *      - nsxInst       : NSx instance. Needs to be initiated before call.
  *
  * Return value         : Pointer to the noise estimate per frequency bin.
  *                        Returns NULL if the input is a NULL pointer or an
  *                        uninitialized instance.
  */
-const uint32_t* WebRtcNsx_noise_estimate(const NsxHandle* nsxInst);
+const uint32_t* WebRtcNsx_noise_estimate(NsxHandle* nsxInst);

[turaj, 2016/03/31 15:20:48]

If you decide to keep this as it is (not going with my suggestion to output
domain in this function) then please add a comment that the domain is adaptive
and can be retrieved by calling the following API.

[aluebs-webrtc, 2016/03/31 17:48:13]

I accepted your suggestion and also added the respective comment here.

 
 /* Returns the number of frequency bins, which is the length of the noise
  * estimate for example.
  *
  * Return value         : Number of frequency bins.
  */
 size_t WebRtcNsx_num_freq();
 
+/* Returns the domain of the noise estimate, which is the number of bits that it
+ * needs to be right-shifted to be normalized.
+ *
+ * Return value         : Domain of the noise estimate.
+ */
+int WebRtcNsx_noise_estimate_domain(NsxHandle* nsxInst);
+
 #ifdef __cplusplus
 }
 #endif
 
 #endif  // WEBRTC_MODULES_AUDIO_PROCESSING_NS_NOISE_SUPPRESSION_X_H_