File indexing completed on 2024-05-12 04:53:38

 /*
 SPDX-FileCopyrightText: 2003-2004 Mark Borgerding <Mark@Borgerding.net>
 SPDX-License-Identifier: BSD-3-Clause
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
 
     * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
     * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or
 other materials provided with the distribution.
     * Neither the author nor the names of any contributors may be used to endorse or promote products derived from this software without specific prior written
 permission.
 
 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY
 DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
 #pragma once
 
 #include "../kiss_fft.h"
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 /*
 
  Real optimized version can save about 45% cpu time vs. complex fft of a real seq.
 
 
 
  */
 
 typedef struct kiss_fftr_state *kiss_fftr_cfg;
 
 kiss_fftr_cfg kiss_fftr_alloc(int nfft, int inverse_fft, void *mem, size_t *lenmem);
 /*
  nfft must be even
 
  If you don't care to allocate space, use mem = lenmem = NULL
 */
 
 void kiss_fftr(kiss_fftr_cfg cfg, const kiss_fft_scalar *timedata, kiss_fft_cpx *freqdata);
 /*
  input timedata has nfft scalar points
  output freqdata has nfft/2+1 complex points
 */
 
 void kiss_fftri(kiss_fftr_cfg cfg, const kiss_fft_cpx *freqdata, kiss_fft_scalar *timedata);
 /*
  input freqdata has  nfft/2+1 complex points
  output timedata has nfft scalar points
 */
 
 #define kiss_fftr_free free
 
 #ifdef __cplusplus
 }
 #endif