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_RENDER_SIGNAL_ANALYZER_H_ 12 #define MODULES_AUDIO_PROCESSING_AEC3_RENDER_SIGNAL_ANALYZER_H_ 13 14 #include <array> 15 #include <memory> 16 17 #include "api/optional.h" 18 #include "modules/audio_processing/aec3/aec3_common.h" 19 #include "modules/audio_processing/aec3/render_buffer.h" 20 #include "rtc_base/constructormagic.h" 21 22 namespace webrtc { 23 24 // Provides functionality for analyzing the properties of the render signal. 25 class RenderSignalAnalyzer { 26 public: 27 RenderSignalAnalyzer(); 28 ~RenderSignalAnalyzer(); 29 30 // Updates the render signal analysis with the most recent render signal. 31 void Update(const RenderBuffer& render_buffer, 32 const rtc::Optional<size_t>& delay_partitions); 33 34 // Returns true if the render signal is poorly exciting. PoorSignalExcitation()35 bool PoorSignalExcitation() const { 36 RTC_DCHECK_LT(2, narrow_band_counters_.size()); 37 return std::any_of(narrow_band_counters_.begin(), 38 narrow_band_counters_.end(), 39 [](size_t a) { return a > 10; }); 40 } 41 42 // Zeros the array around regions with narrow bands signal characteristics. 43 void MaskRegionsAroundNarrowBands( 44 std::array<float, kFftLengthBy2Plus1>* v) const; 45 NarrowPeakBand()46 rtc::Optional<int> NarrowPeakBand() const { return narrow_peak_band_; } 47 48 private: 49 std::array<size_t, kFftLengthBy2 - 1> narrow_band_counters_; 50 rtc::Optional<int> narrow_peak_band_; 51 size_t narrow_peak_counter_; 52 53 RTC_DISALLOW_COPY_AND_ASSIGN(RenderSignalAnalyzer); 54 }; 55 56 } // namespace webrtc 57 58 #endif // MODULES_AUDIO_PROCESSING_AEC3_RENDER_SIGNAL_ANALYZER_H_ 59