Utilizing the AEC3 config struct for constants.

webrtc/modules/audio_processing/aec3/erle_estimator.cc

 /*
  *  Copyright (c) 2017 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.
  */
 
 #include "webrtc/modules/audio_processing/aec3/erle_estimator.h"
 
 #include <algorithm>
 
 #include "webrtc/rtc_base/safe_minmax.h"
 
 namespace webrtc {
 
-namespace {
-
-constexpr float kMinErle = 1.f;
-constexpr float kMaxLfErle = 8.f;
-constexpr float kMaxHfErle = 1.5f;
-
-}  // namespace
-
-ErleEstimator::ErleEstimator() {
-  erle_.fill(kMinErle);
+ErleEstimator::ErleEstimator(float min_erle,
+                             float max_erle_lf,
+                             float max_erle_hf)
+    : min_erle_(min_erle),
+      max_erle_lf_(max_erle_lf),
+      max_erle_hf_(max_erle_hf) {
+  erle_.fill(min_erle_);
   hold_counters_.fill(0);
 }
 
 ErleEstimator::~ErleEstimator() = default;
 
 void ErleEstimator::Update(
     const std::array<float, kFftLengthBy2Plus1>& render_spectrum,
     const std::array<float, kFftLengthBy2Plus1>& capture_spectrum,
     const std::array<float, kFftLengthBy2Plus1>& subtractor_spectrum) {
   const auto& X2 = render_spectrum;
   const auto& Y2 = capture_spectrum;
   const auto& E2 = subtractor_spectrum;
 
   // Corresponds of WGN of power -46 dBFS.
   constexpr float kX2Min = 44015068.0f;
 
   // Update the estimates in a clamped minimum statistics manner.
   auto erle_update = [&](size_t start, size_t stop, float max_erle) {
     for (size_t k = start; k < stop; ++k) {
       if (X2[k] > kX2Min && E2[k] > 0.f) {
         const float new_erle = Y2[k] / E2[k];
         if (new_erle > erle_[k]) {
           hold_counters_[k - 1] = 100;
           erle_[k] += 0.1f * (new_erle - erle_[k]);
-          erle_[k] = rtc::SafeClamp(erle_[k], kMinErle, max_erle);
+          erle_[k] = rtc::SafeClamp(erle_[k], min_erle_, max_erle);
         }
       }
     }
   };
-  erle_update(1, kFftLengthBy2 / 2, kMaxLfErle);
-  erle_update(kFftLengthBy2 / 2, kFftLengthBy2, kMaxHfErle);
+  erle_update(1, kFftLengthBy2 / 2, max_erle_lf_);
+  erle_update(kFftLengthBy2 / 2, kFftLengthBy2, max_erle_hf_);
 
   std::for_each(hold_counters_.begin(), hold_counters_.end(),
                 [](int& a) { --a; });
   std::transform(hold_counters_.begin(), hold_counters_.end(),
-                 erle_.begin() + 1, erle_.begin() + 1, [](int a, float b) {
-                   return a > 0 ? b : std::max(kMinErle, 0.97f * b);
+                 erle_.begin() + 1, erle_.begin() + 1, [&](int a, float b) {
+                   return a > 0 ? b : std::max(min_erle_, 0.97f * b);
                  });
 
   erle_[0] = erle_[1];
   erle_[kFftLengthBy2] = erle_[kFftLengthBy2 - 1];
 }
 
 }  // namespace webrtc