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