1 files changed, 47 insertions, 0 deletions
diff --git a/third_party/libwebrtc/modules/audio_processing/ns/histograms.cc b/third_party/libwebrtc/modules/audio_processing/ns/histograms.cc
new file mode 100644
index 0000000000..1d4f4590d2
--- /dev/null
+++ b/third_party/libwebrtc/modules/audio_processing/ns/histograms.cc
@@ -0,0 +1,47 @@
+/*
+ *  Copyright (c) 2019 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 "modules/audio_processing/ns/histograms.h"
+
+namespace webrtc {
+
+Histograms::Histograms() {
+  Clear();
+}
+
+void Histograms::Clear() {
+  lrt_.fill(0);
+  spectral_flatness_.fill(0);
+  spectral_diff_.fill(0);
+}
+
+void Histograms::Update(const SignalModel& features_) {
+  // Update the histogram for the LRT.
+  constexpr float kOneByBinSizeLrt = 1.f / kBinSizeLrt;
+  if (features_.lrt < kHistogramSize * kBinSizeLrt && features_.lrt >= 0.f) {
+    ++lrt_[kOneByBinSizeLrt * features_.lrt];
+  }
+
+  // Update histogram for the spectral flatness.
+  constexpr float kOneByBinSizeSpecFlat = 1.f / kBinSizeSpecFlat;
+  if (features_.spectral_flatness < kHistogramSize * kBinSizeSpecFlat &&
+      features_.spectral_flatness >= 0.f) {
+    ++spectral_flatness_[features_.spectral_flatness * kOneByBinSizeSpecFlat];
+  }
+
+  // Update histogram for the spectral difference.
+  constexpr float kOneByBinSizeSpecDiff = 1.f / kBinSizeSpecDiff;
+  if (features_.spectral_diff < kHistogramSize * kBinSizeSpecDiff &&
+      features_.spectral_diff >= 0.f) {
+    ++spectral_diff_[features_.spectral_diff * kOneByBinSizeSpecDiff];
+  }
+}
+
+}  // namespace webrtc