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/*
* Copyright (C) 2015-2018 Team Kodi
* This file is part of Kodi - https://kodi.tv
*
* SPDX-License-Identifier: GPL-2.0-or-later
* See LICENSES/README.md for more information.
*/
#pragma once
#include <vector>
#include <kissfft/kiss_fftr.h>
//! \brief Class performing a RFFT of interleaved stereo data.
class RFFT
{
public:
//! \brief The constructor creates a RFFT plan.
//! \brief size Length of time data for a single channel.
//! \brief windowed Whether or not to apply a Hann window to data.
RFFT(int size, bool windowed=false);
//! \brief Free the RFFT plan
~RFFT();
//! \brief Calculate FFTs
//! \param input Input data of size 2*m_size
//! \param output Output data of size m_size.
void calc(const float* input, float* output);
protected:
//! \brief Apply a Hann window to a buffer.
//! \param data Vector with data to apply window to.
static void hann(std::vector<kiss_fft_scalar>& data);
size_t m_size; //!< Size for a single channel.
bool m_windowed; //!< Whether or not a Hann window is applied.
kiss_fftr_cfg m_cfg; //!< FFT plan
};
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