moving_average.h (1274B)
1 /* 2 * Copyright (c) 2018 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_MOVING_AVERAGE_H_ 12 #define MODULES_AUDIO_PROCESSING_AEC3_MOVING_AVERAGE_H_ 13 14 #include <stddef.h> 15 16 #include <vector> 17 18 #include "api/array_view.h" 19 20 namespace webrtc { 21 namespace aec3 { 22 23 class MovingAverage { 24 public: 25 // Creates an instance of MovingAverage that accepts inputs of length num_elem 26 // and averages over mem_len inputs. 27 MovingAverage(size_t num_elem, size_t mem_len); 28 ~MovingAverage(); 29 30 // Computes the average of input and mem_len-1 previous inputs and stores the 31 // result in output. 32 void Average(ArrayView<const float> input, ArrayView<float> output); 33 34 private: 35 const size_t num_elem_; 36 const size_t mem_len_; 37 const float scaling_; 38 std::vector<float> memory_; 39 size_t mem_index_; 40 }; 41 42 } // namespace aec3 43 } // namespace webrtc 44 45 #endif // MODULES_AUDIO_PROCESSING_AEC3_MOVING_AVERAGE_H_