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/*
* Copyright (c) 2016 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_AGC2_NOISE_LEVEL_ESTIMATOR_H_
#define MODULES_AUDIO_PROCESSING_AGC2_NOISE_LEVEL_ESTIMATOR_H_
#include "modules/audio_processing/agc2/signal_classifier.h"
#include "modules/audio_processing/include/audio_frame_view.h"
#include "rtc_base/constructor_magic.h"
namespace webrtc {
class ApmDataDumper;
class NoiseLevelEstimator {
public:
NoiseLevelEstimator(ApmDataDumper* data_dumper);
~NoiseLevelEstimator();
// Returns the estimated noise level in dBFS.
float Analyze(const AudioFrameView<const float>& frame);
private:
void Initialize(int sample_rate_hz);
int sample_rate_hz_;
float min_noise_energy_;
bool first_update_;
float noise_energy_;
int noise_energy_hold_counter_;
SignalClassifier signal_classifier_;
RTC_DISALLOW_COPY_AND_ASSIGN(NoiseLevelEstimator);
};
} // namespace webrtc
#endif // MODULES_AUDIO_PROCESSING_AGC2_NOISE_LEVEL_ESTIMATOR_H_
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