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51 lines
1.0 KiB
51 lines
1.0 KiB
#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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