Finalization of the first version of EchoCanceller 3

webrtc/modules/audio_processing/aec3/suppression_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_SUPPRESSION_GAIN_H_
+#define WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_SUPPRESSION_GAIN_H_
+
+#include <array>
+#include <vector>
+
+#include "webrtc/base/constructormagic.h"
+#include "webrtc/modules/audio_processing/aec3/aec3_constants.h"
+#include "webrtc/modules/audio_processing/aec3/fft_buffer.h"
+
+namespace webrtc {
+
+class SuppressionGain {
+ public:
+  SuppressionGain();
+  void GetGain(const std::array<float, kFftLengthBy2Plus1>& nearend_power,
+               const std::array<float, kFftLengthBy2Plus1>& residual_echo_power,
+               const std::array<float, kFftLengthBy2Plus1>& comfort_noise_power,
+               float strong_nearend_margin,
+               std::array<float, kFftLengthBy2Plus1>* gain);
+
+ private:
+  std::array<float, kFftLengthBy2 - 1> previous_gain_squared_;
+  std::array<float, kFftLengthBy2 - 1> previous_masker_;
+  RTC_DISALLOW_COPY_AND_ASSIGN(SuppressionGain);
+};
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_SUPPRESSION_GAIN_H_