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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_NS_NS_FFT_H_
#define MODULES_AUDIO_PROCESSING_NS_NS_FFT_H_
#include <vector>
#include "api/array_view.h"
#include "modules/audio_processing/ns/ns_common.h"
namespace webrtc {
// Wrapper class providing 256 point FFT functionality.
class NrFft {
public:
NrFft();
NrFft(const NrFft&) = delete;
NrFft& operator=(const NrFft&) = delete;
// Transforms the signal from time to frequency domain.
void Fft(rtc::ArrayView<float, kFftSize> time_data,
rtc::ArrayView<float, kFftSize> real,
rtc::ArrayView<float, kFftSize> imag);
// Transforms the signal from frequency to time domain.
void Ifft(rtc::ArrayView<const float> real,
rtc::ArrayView<const float> imag,
rtc::ArrayView<float> time_data);
private:
std::vector<size_t> bit_reversal_state_;
std::vector<float> tables_;
};
} // namespace webrtc
#endif // MODULES_AUDIO_PROCESSING_NS_NS_FFT_H_
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