1 /* 2 * Copyright (c) 2019 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_NS_SPEECH_PROBABILITY_ESTIMATOR_H_ 12 #define MODULES_AUDIO_PROCESSING_NS_SPEECH_PROBABILITY_ESTIMATOR_H_ 13 14 #include <array> 15 16 #include "api/array_view.h" 17 #include "modules/audio_processing/ns/ns_common.h" 18 #include "modules/audio_processing/ns/signal_model_estimator.h" 19 20 namespace webrtc { 21 22 // Class for estimating the probability of speech. 23 class SpeechProbabilityEstimator { 24 public: 25 SpeechProbabilityEstimator(); 26 SpeechProbabilityEstimator(const SpeechProbabilityEstimator&) = delete; 27 SpeechProbabilityEstimator& operator=(const SpeechProbabilityEstimator&) = 28 delete; 29 30 // Compute speech probability. 31 void Update( 32 int32_t num_analyzed_frames, 33 rtc::ArrayView<const float, kFftSizeBy2Plus1> prior_snr, 34 rtc::ArrayView<const float, kFftSizeBy2Plus1> post_snr, 35 rtc::ArrayView<const float, kFftSizeBy2Plus1> conservative_noise_spectrum, 36 rtc::ArrayView<const float, kFftSizeBy2Plus1> signal_spectrum, 37 float signal_spectral_sum, 38 float signal_energy); 39 get_prior_probability()40 float get_prior_probability() const { return prior_speech_prob_; } get_probability()41 rtc::ArrayView<const float> get_probability() { return speech_probability_; } 42 43 private: 44 SignalModelEstimator signal_model_estimator_; 45 float prior_speech_prob_ = .5f; 46 std::array<float, kFftSizeBy2Plus1> speech_probability_; 47 }; 48 49 } // namespace webrtc 50 51 #endif // MODULES_AUDIO_PROCESSING_NS_SPEECH_PROBABILITY_ESTIMATOR_H_ 52