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| 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 WEBRTC_MODULES_AUDIO_PROCESSING_LEVEL_CONTROLLER_SIGNAL_CLASSIFIER_H_ |
| 12 #define WEBRTC_MODULES_AUDIO_PROCESSING_LEVEL_CONTROLLER_SIGNAL_CLASSIFIER_H_ |
| 13 |
| 14 #include <memory> |
| 15 |
| 16 #include "webrtc/base/array_view.h" |
| 17 #include "webrtc/base/constructormagic.h" |
| 18 #include "webrtc/modules/audio_processing/level_controller/down_sampler.h" |
| 19 #include "webrtc/modules/audio_processing/level_controller/noise_spectrum_estima
tor.h" |
| 20 |
| 21 namespace webrtc { |
| 22 |
| 23 class ApmDataDumper; |
| 24 class AudioBuffer; |
| 25 class FrameExtender; |
| 26 |
| 27 class SignalClassifier { |
| 28 public: |
| 29 enum class SignalType { kHighlyNonStationary, kNonStationary, kStationary }; |
| 30 |
| 31 explicit SignalClassifier(ApmDataDumper* data_dumper); |
| 32 ~SignalClassifier(); |
| 33 |
| 34 void Initialize(int sample_rate_hz); |
| 35 void Analyze(const AudioBuffer& audio, SignalType* signal_type); |
| 36 |
| 37 private: |
| 38 ApmDataDumper* data_dumper_; |
| 39 DownSampler down_sampler_; |
| 40 std::unique_ptr<FrameExtender> frame_extender_; |
| 41 NoiseSpectrumEstimator noise_spectrum_estimator_; |
| 42 int sample_rate_hz_; |
| 43 int initialization_frames_left_; |
| 44 int consistent_classification_counter_; |
| 45 SignalType last_signal_type_; |
| 46 RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(SignalClassifier); |
| 47 }; |
| 48 |
| 49 } // namespace webrtc |
| 50 |
| 51 #endif // WEBRTC_MODULES_AUDIO_PROCESSING_LEVEL_CONTROLLER_SIGNAL_CLASSIFIER_H_ |
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