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 <stdint.h> 15 16 #include <array> 17 #include <memory> 18 19 #include "modules/audio_processing/aec3/aec3_common.h" 20 #include "modules/audio_processing/aec3/aec_state.h" 21 #include "modules/audio_processing/aec3/fft_data.h" 22 #include "rtc_base/constructor_magic.h" 23 #include "rtc_base/system/arch.h" 24 25 namespace webrtc { 26 namespace aec3 { 27 #if defined(WEBRTC_ARCH_X86_FAMILY) 28 29 void EstimateComfortNoise_SSE2(const std::array<float, kFftLengthBy2Plus1>& N2, 30 uint32_t* seed, 31 FftData* lower_band_noise, 32 FftData* upper_band_noise); 33 #endif 34 void EstimateComfortNoise(const std::array<float, kFftLengthBy2Plus1>& N2, 35 uint32_t* seed, 36 FftData* lower_band_noise, 37 FftData* upper_band_noise); 38 39 } // namespace aec3 40 41 // Generates the comfort noise. 42 class ComfortNoiseGenerator { 43 public: 44 ComfortNoiseGenerator(const EchoCanceller3Config& config, 45 Aec3Optimization optimization, 46 size_t num_capture_channels); 47 ComfortNoiseGenerator() = delete; 48 ~ComfortNoiseGenerator(); 49 ComfortNoiseGenerator(const ComfortNoiseGenerator&) = delete; 50 51 // Computes the comfort noise. 52 void Compute(bool saturated_capture, 53 rtc::ArrayView<const std::array<float, kFftLengthBy2Plus1>> 54 capture_spectrum, 55 rtc::ArrayView<FftData> lower_band_noise, 56 rtc::ArrayView<FftData> upper_band_noise); 57 58 // Returns the estimate of the background noise spectrum. NoiseSpectrum()59 rtc::ArrayView<const std::array<float, kFftLengthBy2Plus1>> NoiseSpectrum() 60 const { 61 return N2_; 62 } 63 64 private: 65 const Aec3Optimization optimization_; 66 uint32_t seed_; 67 const size_t num_capture_channels_; 68 const float noise_floor_; 69 std::unique_ptr<std::vector<std::array<float, kFftLengthBy2Plus1>>> 70 N2_initial_; 71 std::vector<std::array<float, kFftLengthBy2Plus1>> Y2_smoothed_; 72 std::vector<std::array<float, kFftLengthBy2Plus1>> N2_; 73 int N2_counter_ = 0; 74 }; 75 76 } // namespace webrtc 77 78 #endif // MODULES_AUDIO_PROCESSING_AEC3_COMFORT_NOISE_GENERATOR_H_ 79