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/*
* Copyright (C) 2020 Linux Studio Plugins Project <https://lsp-plug.in/>
* (C) 2020 Vladimir Sadovnikov <sadko4u@gmail.com>
*
* This file is part of lsp-dsp-lib
* Created on: 31 мар. 2020 г.
*
* lsp-dsp-lib is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* lsp-dsp-lib is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with lsp-dsp-lib. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef LSP_PLUG_IN_DSP_COMMON_FFT_H_
#define LSP_PLUG_IN_DSP_COMMON_FFT_H_
#include <lsp-plug.in/dsp/common/types.h>
/** Direct Fast Fourier Transform
* @param dst_re real part of spectrum
* @param dst_im imaginary part of spectrum
* @param src_re real part of signal
* @param src_im imaginary part of signal
* @param rank the rank of FFT
*/
LSP_DSP_LIB_SYMBOL(void, direct_fft, float *dst_re, float *dst_im, const float *src_re, const float *src_im, size_t rank);
/** Direct Fast Fourier Transform with packed complex data
* @param dst complex spectrum [re, im, re, im ...]
* @param src complex signal [re, im, re, im ...]
* @param rank the rank of FFT
*/
LSP_DSP_LIB_SYMBOL(void, packed_direct_fft, float *dst, const float *src, size_t rank);
/** Reverse Fast Fourier transform
* @param dst_re real part of signal
* @param dst_im imaginary part of signal
* @param src_re real part of spectrum
* @param src_im imaginary part of spectrum
* @param rank the rank of FFT
*/
LSP_DSP_LIB_SYMBOL(void, reverse_fft, float *dst_re, float *dst_im, const float *src_re, const float *src_im, size_t rank);
/** Reverse Fast Fourier transform with packed complex data
* @param dst complex signal [re, im, re, im ...]
* @param src complex spectrum [re, im, re, im ...]
* @param rank the rank of FFT
*/
LSP_DSP_LIB_SYMBOL(void, packed_reverse_fft, float *dst, const float *src, size_t rank);
/** Normalize FFT coefficients
*
* @param dst_re target array for real part of signal
* @param dst_im target array for imaginary part of signal
* @param src_re real part of spectrum
* @param src_im imaginary part of spectrum;
* @param rank the rank of FFT
*/
LSP_DSP_LIB_SYMBOL(void, normalize_fft3, float *dst_re, float *dst_im, const float *src_re, const float *src_im, size_t rank);
/** Normalize FFT coefficients
*
* @param re target array for real part of signal
* @param im target array for imaginary part of signal
* @param rank the rank of FFT
*/
LSP_DSP_LIB_SYMBOL(void, normalize_fft2, float *re, float *im, size_t rank);
/** Center FFT coefficients
*
* @param dst_re target array for real part of signal
* @param dst_im target array for imaginary part of signal
* @param src_re source array for real part of signal
* @param src_im source array for imaginary part of signal
* @param rank rank of FFT
*/
LSP_DSP_LIB_SYMBOL(void, center_fft, float *dst_re, float *dst_im, const float *src_re, const float *src_im, size_t rank);
/** Leave only harmonics with positive frequencies
*
* @param dst_re target array for real part of signal
* @param dst_im target array for imaginary part of signal
* @param src_re source array for real part of signal
* @param src_im source array for imaginary part of signal
* @param rank rank of FFT
*/
LSP_DSP_LIB_SYMBOL(void, combine_fft, float *dst_re, float *dst_im, const float *src_re, const float *src_im, size_t rank);
/** Leave only harmonics with positive frequencies
*
* @param dst target array for complex data
* @param src source array for complex data
* @param rank rank of FFT
*/
LSP_DSP_LIB_SYMBOL(void, packed_combine_fft, float *dst, const float *src, size_t rank);
#endif /* LSP_PLUG_IN_DSP_COMMON_FFT_H_ */
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