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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_LEVEL_CONTROLLER_SIGNAL_CLASSIFIER_H_
#define MODULES_AUDIO_PROCESSING_LEVEL_CONTROLLER_SIGNAL_CLASSIFIER_H_
#include <memory>
#include <vector>
#include "api/array_view.h"
#include "modules/audio_processing/level_controller/down_sampler.h"
#include "modules/audio_processing/level_controller/noise_spectrum_estimator.h"
#include "modules/audio_processing/utility/ooura_fft.h"
#include "rtc_base/constructormagic.h"
namespace webrtc {
class ApmDataDumper;
class AudioBuffer;
class SignalClassifier {
public:
enum class SignalType { kHighlyNonStationary, kNonStationary, kStationary };
explicit SignalClassifier(ApmDataDumper* data_dumper);
~SignalClassifier();
void Initialize(int sample_rate_hz);
void Analyze(const AudioBuffer& audio, SignalType* signal_type);
private:
class FrameExtender {
public:
FrameExtender(size_t frame_size, size_t extended_frame_size);
~FrameExtender();
void ExtendFrame(rtc::ArrayView<const float> x,
rtc::ArrayView<float> x_extended);
private:
std::vector<float> x_old_;
RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(FrameExtender);
};
ApmDataDumper* const data_dumper_;
DownSampler down_sampler_;
std::unique_ptr<FrameExtender> frame_extender_;
NoiseSpectrumEstimator noise_spectrum_estimator_;
int sample_rate_hz_;
int initialization_frames_left_;
int consistent_classification_counter_;
SignalType last_signal_type_;
const OouraFft ooura_fft_;
RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(SignalClassifier);
};
} // namespace webrtc
#endif // MODULES_AUDIO_PROCESSING_LEVEL_CONTROLLER_SIGNAL_CLASSIFIER_H_
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