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/*
* Copyright (c) 2019 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_AUTO_CORRELATION_H_
#define MODULES_AUDIO_PROCESSING_AGC2_RNN_VAD_AUTO_CORRELATION_H_
#include <memory>
#include "api/array_view.h"
#include "modules/audio_processing/agc2/rnn_vad/common.h"
#include "modules/audio_processing/utility/pffft_wrapper.h"
namespace webrtc {
namespace rnn_vad {
// Class to compute the auto correlation on the pitch buffer for a target pitch
// interval.
class AutoCorrelationCalculator {
public:
AutoCorrelationCalculator();
AutoCorrelationCalculator(const AutoCorrelationCalculator&) = delete;
AutoCorrelationCalculator& operator=(const AutoCorrelationCalculator&) =
delete;
~AutoCorrelationCalculator();
// Computes the auto-correlation coefficients for a target pitch interval.
// `auto_corr` indexes are inverted lags.
void ComputeOnPitchBuffer(
rtc::ArrayView<const float, kBufSize12kHz> pitch_buf,
rtc::ArrayView<float, kNumLags12kHz> auto_corr);
private:
Pffft fft_;
std::unique_ptr<Pffft::FloatBuffer> tmp_;
std::unique_ptr<Pffft::FloatBuffer> X_;
std::unique_ptr<Pffft::FloatBuffer> H_;
};
} // namespace rnn_vad
} // namespace webrtc
#endif // MODULES_AUDIO_PROCESSING_AGC2_RNN_VAD_AUTO_CORRELATION_H_
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