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/*
* Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef MODULES_AUDIO_PROCESSING_AEC3_COMFORT_NOISE_GENERATOR_H_
#define MODULES_AUDIO_PROCESSING_AEC3_COMFORT_NOISE_GENERATOR_H_
#include <stdint.h>
#include <array>
#include <memory>
#include "modules/audio_processing/aec3/aec3_common.h"
#include "modules/audio_processing/aec3/aec_state.h"
#include "modules/audio_processing/aec3/fft_data.h"
#include "rtc_base/system/arch.h"
namespace webrtc {
namespace aec3 {
#if defined(WEBRTC_ARCH_X86_FAMILY)
void EstimateComfortNoise_SSE2(const std::array<float, kFftLengthBy2Plus1>& N2,
uint32_t* seed,
FftData* lower_band_noise,
FftData* upper_band_noise);
#endif
void EstimateComfortNoise(const std::array<float, kFftLengthBy2Plus1>& N2,
uint32_t* seed,
FftData* lower_band_noise,
FftData* upper_band_noise);
} // namespace aec3
// Generates the comfort noise.
class ComfortNoiseGenerator {
public:
ComfortNoiseGenerator(const EchoCanceller3Config& config,
Aec3Optimization optimization,
size_t num_capture_channels);
ComfortNoiseGenerator() = delete;
~ComfortNoiseGenerator();
ComfortNoiseGenerator(const ComfortNoiseGenerator&) = delete;
// Computes the comfort noise.
void Compute(bool saturated_capture,
rtc::ArrayView<const std::array<float, kFftLengthBy2Plus1>>
capture_spectrum,
rtc::ArrayView<FftData> lower_band_noise,
rtc::ArrayView<FftData> upper_band_noise);
// Returns the estimate of the background noise spectrum.
rtc::ArrayView<const std::array<float, kFftLengthBy2Plus1>> NoiseSpectrum()
const {
return N2_;
}
private:
const Aec3Optimization optimization_;
uint32_t seed_;
const size_t num_capture_channels_;
const float noise_floor_;
std::unique_ptr<std::vector<std::array<float, kFftLengthBy2Plus1>>>
N2_initial_;
std::vector<std::array<float, kFftLengthBy2Plus1>> Y2_smoothed_;
std::vector<std::array<float, kFftLengthBy2Plus1>> N2_;
int N2_counter_ = 0;
};
} // namespace webrtc
#endif // MODULES_AUDIO_PROCESSING_AEC3_COMFORT_NOISE_GENERATOR_H_