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/*
* Copyright (c) 2015 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 COMMON_AUDIO_REAL_FOURIER_OOURA_H_
#define COMMON_AUDIO_REAL_FOURIER_OOURA_H_
#include <stddef.h>
#include <complex>
#include <memory>
#include "common_audio/real_fourier.h"
namespace webrtc {
class RealFourierOoura : public RealFourier {
public:
explicit RealFourierOoura(int fft_order);
~RealFourierOoura() override;
void Forward(const float* src, std::complex<float>* dest) const override;
void Inverse(const std::complex<float>* src, float* dest) const override;
int order() const override;
private:
const int order_;
const size_t length_;
const size_t complex_length_;
// These are work arrays for Ooura. The names are based on the comments in
// common_audio/third_party/ooura/fft_size_256/fft4g.cc.
const std::unique_ptr<size_t[]> work_ip_;
const std::unique_ptr<float[]> work_w_;
};
} // namespace webrtc
#endif // COMMON_AUDIO_REAL_FOURIER_OOURA_H_
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