68 lines
1.9 KiB
C
68 lines
1.9 KiB
C
|
/*
|
||
|
|
* 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_SIGNAL_CLASSIFIER_H_
|
||
|
|
#define MODULES_AUDIO_PROCESSING_AGC2_SIGNAL_CLASSIFIER_H_
|
||
|
|
|
||
|
|
#include <memory>
|
||
|
|
#include <vector>
|
||
|
|
|
||
|
|
#include "api/array_view.h"
|
||
|
|
#include "modules/audio_processing/agc2/down_sampler.h"
|
||
|
|
#include "modules/audio_processing/agc2/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 { kNonStationary, kStationary };
|
||
|
|
|
||
|
|
explicit SignalClassifier(ApmDataDumper* data_dumper);
|
||
|
|
~SignalClassifier();
|
||
|
|
|
||
|
|
void Initialize(int sample_rate_hz);
|
||
|
|
SignalType Analyze(rtc::ArrayView<const float> signal);
|
||
|
|
|
||
|
|
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_AGC2_SIGNAL_CLASSIFIER_H_
|