Integrate Intelligibility with APM

webrtc/modules/audio_processing/intelligibility/intelligibility_utils.cc

 /*
  *  Copyright (c) 2014 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 311 matching lines @@
   for (int i = 0; i < freqs_; ++i) {
     float factor = sqrtf(fabsf(current_[i]));
     if (!std::isnormal(factor)) {
       factor = 1.0f;
     }
     out_block[i] = factor * in_block[i];
     current_[i] = UpdateFactor(target_[i], current_[i], change_limit_);
   }
 }
 
+void GainApplier::Clear() {
+  for (int i = 0; i < freqs_; i++) {

[aluebs-webrtc, 2015/07/20 19:33:43]

++i
Also, maybe use num_freqs_? It is clearer.

[ekm, 2015/07/21 01:02:44]

Done.

+    target_[i] = 1.0f;

[aluebs-webrtc, 2015/07/20 19:33:43]

1.f

[ekm, 2015/07/21 01:02:44]

Done.

+  }
+}
+
+// TODO(ekmeyerson): Can reduce from O(|freqs_|) to O(1) if necessary.
+bool GainApplier::IsIdentity() {
+  for (int i = 0; i < freqs_; i++) {

[aluebs-webrtc, 2015/07/20 19:33:43]

++i

[ekm, 2015/07/21 01:02:44]

Done.

+    if (current_[i] != 1.0f || target_[i] != 1.0f) {

[aluebs-webrtc, 2015/07/20 19:33:43]

1.f both times.

[ekm, 2015/07/21 01:02:44]

Done.

+      return false;
+    }
+  }
+  return true;
+}
+
 }  // namespace intelligibility
 
 }  // namespace webrtc