f40bfc9267
Change-Id: Id7f4717d51ed02d67cb9f9cb3c0ada4a81843f97 Reviewed-on: http://gerrit.rockbox.org/137 Reviewed-by: Nils Wallménius <nils@rockbox.org> Tested-by: Nils Wallménius <nils@rockbox.org>
51 lines
1 KiB
C
51 lines
1 KiB
C
#ifndef KISS_FTR_H
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#define KISS_FTR_H
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#include "kiss_fft.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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Real optimized version can save about 45% cpu time vs. complex fft of a real seq.
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*/
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typedef struct kiss_fftr_state *kiss_fftr_cfg;
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kiss_fftr_cfg kiss_fftr_alloc(int nfft,int inverse_fft,void * mem, size_t * lenmem);
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/*
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nfft must be even
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If you don't care to allocate space, use mem = lenmem = NULL
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*/
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void kiss_fftr(kiss_fftr_cfg cfg,const kiss_fft_scalar *timedata,kiss_fft_cpx *freqdata);
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/*
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input timedata has nfft scalar points
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output freqdata has nfft/2+1 complex points
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*/
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void kiss_fftr2(kiss_fftr_cfg st,const kiss_fft_scalar *timedata,kiss_fft_scalar *freqdata);
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void kiss_fftri(kiss_fftr_cfg cfg,const kiss_fft_cpx *freqdata,kiss_fft_scalar *timedata);
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void kiss_fftri2(kiss_fftr_cfg st,const kiss_fft_scalar *freqdata, kiss_fft_scalar *timedata);
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/*
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input freqdata has nfft/2+1 complex points
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output timedata has nfft scalar points
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*/
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#define kiss_fftr_free speex_free
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#ifdef __cplusplus
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}
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#endif
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#endif
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