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_COMFORT_NOISE_GENERATOR_H_ 12 #define MODULES_AUDIO_PROCESSING_AEC3_COMFORT_NOISE_GENERATOR_H_ 13 14 #include <array> 15 #include <memory> 16 17 #include "modules/audio_processing/aec3/aec3_common.h" 18 #include "modules/audio_processing/aec3/aec_state.h" 19 #include "modules/audio_processing/aec3/fft_data.h" 20 #include "rtc_base/constructormagic.h" 21 22 namespace webrtc { 23 namespace aec3 { 24 #if defined(WEBRTC_ARCH_X86_FAMILY) 25 26 void EstimateComfortNoise_SSE2(const std::array<float, kFftLengthBy2Plus1>& N2, 27 uint32_t* seed, 28 FftData* lower_band_noise, 29 FftData* upper_band_noise); 30 #endif 31 void EstimateComfortNoise(const std::array<float, kFftLengthBy2Plus1>& N2, 32 uint32_t* seed, 33 FftData* lower_band_noise, 34 FftData* upper_band_noise); 35 36 } // namespace aec3 37 38 // Generates the comfort noise. 39 class ComfortNoiseGenerator { 40 public: 41 explicit ComfortNoiseGenerator(Aec3Optimization optimization); 42 ~ComfortNoiseGenerator(); 43 44 // Computes the comfort noise. 45 void Compute(const AecState& aec_state, 46 const std::array<float, kFftLengthBy2Plus1>& capture_spectrum, 47 FftData* lower_band_noise, 48 FftData* upper_band_noise); 49 50 // Returns the estimate of the background noise spectrum. NoiseSpectrum()51 const std::array<float, kFftLengthBy2Plus1>& NoiseSpectrum() const { 52 return N2_; 53 } 54 55 private: 56 const Aec3Optimization optimization_; 57 uint32_t seed_; 58 std::unique_ptr<std::array<float, kFftLengthBy2Plus1>> N2_initial_; 59 std::array<float, kFftLengthBy2Plus1> Y2_smoothed_; 60 std::array<float, kFftLengthBy2Plus1> N2_; 61 int N2_counter_ = 0; 62 63 RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(ComfortNoiseGenerator); 64 }; 65 66 } // namespace webrtc 67 68 #endif // MODULES_AUDIO_PROCESSING_AEC3_COMFORT_NOISE_GENERATOR_H_ 69