text: /*
   *  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_FILTER_H_
  #define WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_SUPPRESSION_FILTER_H_
  
  #include <array>
  #include <vector>
  
  #include "webrtc/modules/audio_processing/aec3/aec3_common.h"
  #include "webrtc/modules/audio_processing/aec3/aec3_fft.h"
  #include "webrtc/rtc_base/constructormagic.h"
  
  namespace webrtc {
  
  class SuppressionFilter {
   public:
    explicit SuppressionFilter(int sample_rate_hz);
    ~SuppressionFilter();
    void ApplyGain(const FftData& comfort_noise,
                   const FftData& comfort_noise_high_bands,
                   const std::array<float, kFftLengthBy2Plus1>& suppression_gain,
                   float high_bands_gain,
                   std::vector<std::vector<float>>* e);
  
   private:
    const int sample_rate_hz_;
    const OouraFft ooura_fft_;
    const Aec3Fft fft_;
    std::array<float, kFftLengthBy2> e_input_old_;
    std::vector<std::array<float, kFftLengthBy2>> e_output_old_;
    RTC_DISALLOW_COPY_AND_ASSIGN(SuppressionFilter);
  };
  
  }  // namespace webrtc
  
  #endif  // WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_SUPPRESSION_FILTER_H_
  