blob: d47a85bfb06d3e38b214dba5f9e27bc3fc9c807e [file] [log] [blame]
* 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.
#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 {
explicit FeaturesExtractor(const AvailableCpuFeatures& cpu_features);
FeaturesExtractor(const FeaturesExtractor&) = delete;
FeaturesExtractor& operator=(const FeaturesExtractor&) = delete;
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(
rtc::ArrayView<const float, kFrameSize10ms24kHz> samples,
rtc::ArrayView<float, kFeatureVectorSize> feature_vector);
const bool use_high_pass_filter_;
// TODO( 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>
rtc::ArrayView<const float, kBufSize24kHz> pitch_buf_24kHz_view_;
std::vector<float> lp_residual_;
rtc::ArrayView<float, kBufSize24kHz> lp_residual_view_;
PitchEstimator pitch_estimator_;
rtc::ArrayView<const float, kFrameSize20ms24kHz> reference_frame_view_;
SpectralFeaturesExtractor spectral_features_extractor_;
int pitch_period_48kHz_;
} // namespace rnn_vad
} // namespace webrtc