1 /* 2 * Copyright (c) 2017 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #ifndef MODULES_AUDIO_PROCESSING_AEC3_ERLE_ESTIMATOR_H_ 12 #define MODULES_AUDIO_PROCESSING_AEC3_ERLE_ESTIMATOR_H_ 13 14 #include <array> 15 16 #include "modules/audio_processing/aec3/aec3_common.h" 17 #include "rtc_base/constructormagic.h" 18 19 namespace webrtc { 20 21 // Estimates the echo return loss enhancement based on the signal spectra. 22 class ErleEstimator { 23 public: 24 ErleEstimator(float min_erle, float max_erle_lf, float max_erle_hf); 25 ~ErleEstimator(); 26 27 // Updates the ERLE estimate. 28 void Update(const std::array<float, kFftLengthBy2Plus1>& render_spectrum, 29 const std::array<float, kFftLengthBy2Plus1>& capture_spectrum, 30 const std::array<float, kFftLengthBy2Plus1>& subtractor_spectrum); 31 32 // Returns the most recent ERLE estimate. Erle()33 const std::array<float, kFftLengthBy2Plus1>& Erle() const { return erle_; } ErleTimeDomain()34 float ErleTimeDomain() const { return erle_time_domain_; } 35 36 private: 37 std::array<float, kFftLengthBy2Plus1> erle_; 38 std::array<int, kFftLengthBy2Minus1> hold_counters_; 39 float erle_time_domain_; 40 int hold_counter_time_domain_; 41 const float min_erle_; 42 const float max_erle_lf_; 43 const float max_erle_hf_; 44 45 RTC_DISALLOW_COPY_AND_ASSIGN(ErleEstimator); 46 }; 47 48 } // namespace webrtc 49 50 #endif // MODULES_AUDIO_PROCESSING_AEC3_ERLE_ESTIMATOR_H_ 51