bcec8b0b21
This is from the upstream library commit id 3326535126e435f1ba647885ce43a8f0f3d317eb, corresponding to Chromium 88.0.4290.1.
80 lines
3.2 KiB
C++
80 lines
3.2 KiB
C++
/*
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* Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef MODULES_AUDIO_PROCESSING_AGC2_RNN_VAD_SPECTRAL_FEATURES_H_
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#define MODULES_AUDIO_PROCESSING_AGC2_RNN_VAD_SPECTRAL_FEATURES_H_
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#include <array>
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#include <cstddef>
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#include <memory>
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#include <vector>
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#include "api/array_view.h"
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#include "modules/audio_processing/agc2/rnn_vad/common.h"
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#include "modules/audio_processing/agc2/rnn_vad/ring_buffer.h"
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#include "modules/audio_processing/agc2/rnn_vad/spectral_features_internal.h"
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#include "modules/audio_processing/agc2/rnn_vad/symmetric_matrix_buffer.h"
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#include "modules/audio_processing/utility/pffft_wrapper.h"
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namespace webrtc {
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namespace rnn_vad {
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// Class to compute spectral features.
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class SpectralFeaturesExtractor {
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public:
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SpectralFeaturesExtractor();
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SpectralFeaturesExtractor(const SpectralFeaturesExtractor&) = delete;
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SpectralFeaturesExtractor& operator=(const SpectralFeaturesExtractor&) =
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delete;
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~SpectralFeaturesExtractor();
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// Resets the internal state of the feature extractor.
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void Reset();
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// Analyzes a pair of reference and lagged frames from the pitch buffer,
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// detects silence and computes features. If silence is detected, the output
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// is neither computed nor written.
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bool CheckSilenceComputeFeatures(
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rtc::ArrayView<const float, kFrameSize20ms24kHz> reference_frame,
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rtc::ArrayView<const float, kFrameSize20ms24kHz> lagged_frame,
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rtc::ArrayView<float, kNumBands - kNumLowerBands> higher_bands_cepstrum,
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rtc::ArrayView<float, kNumLowerBands> average,
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rtc::ArrayView<float, kNumLowerBands> first_derivative,
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rtc::ArrayView<float, kNumLowerBands> second_derivative,
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rtc::ArrayView<float, kNumLowerBands> bands_cross_corr,
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float* variability);
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private:
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void ComputeAvgAndDerivatives(
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rtc::ArrayView<float, kNumLowerBands> average,
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rtc::ArrayView<float, kNumLowerBands> first_derivative,
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rtc::ArrayView<float, kNumLowerBands> second_derivative) const;
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void ComputeNormalizedCepstralCorrelation(
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rtc::ArrayView<float, kNumLowerBands> bands_cross_corr);
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float ComputeVariability() const;
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const std::array<float, kFrameSize20ms24kHz / 2> half_window_;
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Pffft fft_;
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std::unique_ptr<Pffft::FloatBuffer> fft_buffer_;
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std::unique_ptr<Pffft::FloatBuffer> reference_frame_fft_;
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std::unique_ptr<Pffft::FloatBuffer> lagged_frame_fft_;
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SpectralCorrelator spectral_correlator_;
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std::array<float, kOpusBands24kHz> reference_frame_bands_energy_;
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std::array<float, kOpusBands24kHz> lagged_frame_bands_energy_;
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std::array<float, kOpusBands24kHz> bands_cross_corr_;
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const std::array<float, kNumBands * kNumBands> dct_table_;
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RingBuffer<float, kNumBands, kCepstralCoeffsHistorySize>
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cepstral_coeffs_ring_buf_;
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SymmetricMatrixBuffer<float, kCepstralCoeffsHistorySize> cepstral_diffs_buf_;
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};
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} // namespace rnn_vad
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} // namespace webrtc
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#endif // MODULES_AUDIO_PROCESSING_AGC2_RNN_VAD_SPECTRAL_FEATURES_H_
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