Finalization of the first version of EchoCanceller 3

webrtc/modules/audio_processing/aec3/shadow_filter_update_gain.h

+/*
+ *  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.
+ */
+
+#ifndef WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_SHADOW_FILTER_UPDATE_GAIN_H_
+#define WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_SHADOW_FILTER_UPDATE_GAIN_H_
+
+#include "webrtc/base/constructormagic.h"
+#include "webrtc/modules/audio_processing/aec3/aec3_common.h"
+#include "webrtc/modules/audio_processing/aec3/fft_buffer.h"
+#include "webrtc/modules/audio_processing/aec3/render_signal_analyzer.h"
+
+namespace webrtc {
+
+// Provides functionality for computing the fixed gain for the shadow filter.
+class ShadowFilterUpdateGain {
+ public:
+  // Computes the gain.
+  void Compute(const FftBuffer& X_buffer,
+               const RenderSignalAnalyzer& render_signal_analyzer,
+               const FftData& E_shadow,
+               size_t size_partitions,
+               bool saturated_capture_signal,
+               FftData* G);
+
+ private:
+  size_t poor_signal_excitation_counter_ = 0;
+  size_t call_counter_ = 0;
+};
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_SHADOW_FILTER_UPDATE_GAIN_H_