80 lines
2.3 KiB
C
80 lines
2.3 KiB
C
#ifndef _LSVM_FFT_H_
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#define _LSVM_FFT_H_
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#include "_lsvm_types.h"
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#include "_lsvm_error.h"
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#include <math.h>
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/*
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// 1-dimensional FFT
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//
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// API
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// int fft(float *x_in, float *x_out, int n, int shift);
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// INPUT
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// x_in - input signal
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// n - number of elements for searching Fourier image
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// shift - shift between input elements
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// OUTPUT
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// x_out - output signal (contains 2n elements in order
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Re(x_in[0]), Im(x_in[0]), Re(x_in[1]), Im(x_in[1]) and etc.)
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// RESULT
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// Error status
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*/
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int fft(float *x_in, float *x_out, int n, int shift);
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/*
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// Inverse 1-dimensional FFT
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//
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// API
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// int fftInverse(float *x_in, float *x_out, int n, int shift);
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// INPUT
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// x_in - Fourier image of 1d input signal(contains 2n elements
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in order Re(x_in[0]), Im(x_in[0]),
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Re(x_in[1]), Im(x_in[1]) and etc.)
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// n - number of elements for searching counter FFT image
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// shift - shift between input elements
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// OUTPUT
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// x_in - input signal (contains n elements)
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// RESULT
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// Error status
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*/
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int fftInverse(float *x_in, float *x_out, int n, int shift);
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/*
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// 2-dimensional FFT
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//
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// API
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// int fft2d(float *x_in, float *x_out, int numRows, int numColls);
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// INPUT
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// x_in - input signal (matrix, launched by rows)
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// numRows - number of rows
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// numColls - number of collumns
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// OUTPUT
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// x_out - output signal (contains (2 * numRows * numColls) elements
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in order Re(x_in[0][0]), Im(x_in[0][0]),
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Re(x_in[0][1]), Im(x_in[0][1]) and etc.)
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// RESULT
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// Error status
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*/
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int fft2d(float *x_in, float *x_out, int numRows, int numColls);
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/*
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// Inverse 2-dimensional FFT
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//
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// API
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// int fftInverse2d(float *x_in, float *x_out, int numRows, int numColls);
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// INPUT
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// x_in - Fourier image of matrix (contains (2 * numRows * numColls)
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elements in order Re(x_in[0][0]), Im(x_in[0][0]),
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Re(x_in[0][1]), Im(x_in[0][1]) and etc.)
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// numRows - number of rows
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// numColls - number of collumns
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// OUTPUT
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// x_out - initial signal (matrix, launched by rows)
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// RESULT
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// Error status
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*/
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int fftInverse2d(float *x_in, float *x_out, int numRows, int numColls);
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#endif
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