kopia lustrzana https://github.com/Dsplib/libdspl-2.0
77 wiersze
1.8 KiB
C
77 wiersze
1.8 KiB
C
/*
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* Copyright (c) 2015-2019 Sergey Bakhurin
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* Digital Signal Processing Library [http://dsplib.org]
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*
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* This file is part of libdspl-2.0.
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*
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* is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* DSPL is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with Foobar. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <float.h>
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#include "dspl.h"
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#include "dspl_internal.h"
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#ifdef DOXYGEN_ENGLISH
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#endif
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#ifdef DOXYGEN_RUSSIAN
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#endif
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int DSPL_API fft_shift_cmplx(complex_t* x, int n, complex_t* y)
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{
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int n2, r;
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int k;
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complex_t tmp;
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complex_t *buf;
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if(!x || !y)
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return ERROR_PTR;
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if(n<1)
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return ERROR_SIZE;
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r = n%2;
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if(!r)
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{
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n2 = n>>1;
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for(k = 0; k < n2; k++)
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{
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RE(tmp) = RE(x[k]);
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IM(tmp) = IM(x[k]);
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RE(y[k]) = RE(x[k+n2]);
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IM(y[k]) = IM(x[k+n2]);
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RE(y[k+n2]) = RE(tmp);
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IM(y[k+n2]) = IM(tmp);
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}
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}
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else
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{
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n2 = (n+1) >> 1;
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buf = (complex_t*) malloc(n2*sizeof(complex_t));
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memcpy(buf, x, n2*sizeof(complex_t));
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memcpy(y, x+n2, (n2-1)*sizeof(complex_t));
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memcpy(y+n2-1, buf, n2*sizeof(complex_t));
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free(buf);
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}
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return RES_OK;
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}
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