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/*
* Copyright (c) 2018 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_RNN_VAD_FEATURES_EXTRACTION_H_
#define MODULES_AUDIO_PROCESSING_AGC2_RNN_VAD_FEATURES_EXTRACTION_H_
#include <vector>
#include "api/array_view.h"
#include "modules/audio_processing/agc2/biquad_filter.h"
#include "modules/audio_processing/agc2/rnn_vad/common.h"
#include "modules/audio_processing/agc2/rnn_vad/pitch_search.h"
#include "modules/audio_processing/agc2/rnn_vad/sequence_buffer.h"
#include "modules/audio_processing/agc2/rnn_vad/spectral_features.h"
namespace webrtc {
namespace rnn_vad {
// Feature extractor to feed the VAD RNN.
class FeaturesExtractor {
public:
explicit FeaturesExtractor(const AvailableCpuFeatures& cpu_features);
FeaturesExtractor(const FeaturesExtractor&) = delete;
FeaturesExtractor& operator=(const FeaturesExtractor&) = delete;
~FeaturesExtractor();
void Reset();
// Analyzes the samples, computes the feature vector and returns true if
// silence is detected (false if not). When silence is detected,
// `feature_vector` is partially written and therefore must not be used to
// feed the VAD RNN.
bool CheckSilenceComputeFeatures(
ArrayView<const float, kFrameSize10ms24kHz> samples,
ArrayView<float, kFeatureVectorSize> feature_vector);
private:
const bool use_high_pass_filter_;
// TODO(bugs.webrtc.org/7494): Remove HPF depending on how AGC2 is used in APM
// and on whether an HPF is already used as pre-processing step in APM.
BiQuadFilter hpf_;
SequenceBuffer<float, kBufSize24kHz, kFrameSize10ms24kHz, kFrameSize20ms24kHz>
pitch_buf_24kHz_;
ArrayView<const float, kBufSize24kHz> pitch_buf_24kHz_view_;
std::vector<float> lp_residual_;
ArrayView<float, kBufSize24kHz> lp_residual_view_;
PitchEstimator pitch_estimator_;
ArrayView<const float, kFrameSize20ms24kHz> reference_frame_view_;
SpectralFeaturesExtractor spectral_features_extractor_;
int pitch_period_48kHz_;
};
} // namespace rnn_vad
} // namespace webrtc
#endif // MODULES_AUDIO_PROCESSING_AGC2_RNN_VAD_FEATURES_EXTRACTION_H_
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