1 /* 2 * Copyright (c) 2016 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_AGC2_NOISE_LEVEL_ESTIMATOR_H_ 12 #define MODULES_AUDIO_PROCESSING_AGC2_NOISE_LEVEL_ESTIMATOR_H_ 13 14 #include "modules/audio_processing/agc2/signal_classifier.h" 15 #include "modules/audio_processing/include/audio_frame_view.h" 16 #include "rtc_base/constructor_magic.h" 17 18 namespace webrtc { 19 class ApmDataDumper; 20 21 class NoiseLevelEstimator { 22 public: 23 NoiseLevelEstimator(ApmDataDumper* data_dumper); 24 ~NoiseLevelEstimator(); 25 // Returns the estimated noise level in dBFS. 26 float Analyze(const AudioFrameView<const float>& frame); 27 28 private: 29 void Initialize(int sample_rate_hz); 30 31 int sample_rate_hz_; 32 float min_noise_energy_; 33 bool first_update_; 34 float noise_energy_; 35 int noise_energy_hold_counter_; 36 SignalClassifier signal_classifier_; 37 38 RTC_DISALLOW_COPY_AND_ASSIGN(NoiseLevelEstimator); 39 }; 40 41 } // namespace webrtc 42 43 #endif // MODULES_AUDIO_PROCESSING_AGC2_NOISE_LEVEL_ESTIMATOR_H_ 44