Finalization of the first version of EchoCanceller 3

webrtc/modules/audio_processing/aec3/residual_echo_estimator.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_RESIDUAL_ECHO_ESTIMATOR_H_
+#define WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_RESIDUAL_ECHO_ESTIMATOR_H_
+
+#include <algorithm>
+#include <array>
+#include <vector>
+
+#include "webrtc/base/array_view.h"
+#include "webrtc/base/constructormagic.h"
+#include "webrtc/modules/audio_processing/aec3/aec3_common.h"
+#include "webrtc/modules/audio_processing/aec3/aec_state.h"
+#include "webrtc/modules/audio_processing/aec3/fft_buffer.h"
+
+namespace webrtc {
+
+class ResidualEchoEstimator {
+ public:
+  ResidualEchoEstimator();
+  ~ResidualEchoEstimator();
+
+  void Estimate(bool using_subtractor_output,
+                const AecState& aec_state,
+                const FftBuffer& X_buffer,
+                const std::vector<std::array<float, kFftLengthBy2Plus1>>& H2,
+                const std::array<float, kFftLengthBy2Plus1>& E2_main,
+                const std::array<float, kFftLengthBy2Plus1>& E2_shadow,
+                const std::array<float, kFftLengthBy2Plus1>& S2_linear,
+                const std::array<float, kFftLengthBy2Plus1>& S2_fallback,
+                const std::array<float, kFftLengthBy2Plus1>& Y2,
+                std::array<float, kFftLengthBy2Plus1>* R2);
+
+ private:
+  std::array<float, kFftLengthBy2Plus1> echo_path_gain_;
+  size_t active_render_counter_ = 0;
+  size_t blocks_since_last_saturation_ = 1000;
+
+  RTC_DISALLOW_COPY_AND_ASSIGN(ResidualEchoEstimator);
+};
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_RESIDUAL_ECHO_ESTIMATOR_H_