Revision 7087ce08 libavcodec/fft.h

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libavcodec/fft.h
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#ifndef AVCODEC_FFT_H
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#define AVCODEC_FFT_H
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#ifndef CONFIG_FFT_FLOAT


  		




  
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#define CONFIG_FFT_FLOAT 1


  		




  
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#endif


  		




  
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#include <stdint.h>


  		




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#include "config.h"


  		




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#include "libavutil/mem.h"


  		




  
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#if CONFIG_FFT_FLOAT


  		




  
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#include "avfft.h"


  		




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#define FFT_NAME(x) x


  		




  
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typedef float FFTDouble;


  		




  
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#else


  		




  
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#define FFT_NAME(x) x ## _fixed


  		




  
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typedef int16_t FFTSample;


  		




  
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typedef int     FFTDouble;


  		




  
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typedef struct FFTComplex {


  		




  
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    int16_t re, im;


  		




  
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} FFTComplex;


  		




  
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typedef struct FFTContext FFTContext;


  		




  
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#endif /* CONFIG_FFT_FLOAT */


  		




  
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/* FFT computation */


  		




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struct FFTContext {


  		




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#endif


  		




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#define COSTABLE(size) \


  		




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    COSTABLE_CONST DECLARE_ALIGNED(16, FFTSample, ff_cos_##size)[size/2]


  		




  
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    COSTABLE_CONST DECLARE_ALIGNED(16, FFTSample, FFT_NAME(ff_cos_##size))[size/2]


  		




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extern COSTABLE(16);


  		




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extern COSTABLE(32);


  		




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extern COSTABLE(16384);


  		




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extern COSTABLE(32768);


  		




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extern COSTABLE(65536);


  		




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extern COSTABLE_CONST FFTSample* const ff_cos_tabs[17];


  		




  
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extern COSTABLE_CONST FFTSample* const FFT_NAME(ff_cos_tabs)[17];


  		




  
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#define ff_init_ff_cos_tabs FFT_NAME(ff_init_ff_cos_tabs)


  		




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/**


  		




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 * Initialize the cosine table in ff_cos_tabs[index]


  		




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 */


  		




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void ff_init_ff_cos_tabs(int index);


  		




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#define ff_fft_init FFT_NAME(ff_fft_init)


  		




  
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#define ff_fft_end  FFT_NAME(ff_fft_end)


  		




  
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/**


  		




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 * Set up a complex FFT.


  		




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 * @param nbits           log2 of the length of the input array


  		




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void ff_fft_end(FFTContext *s);


  		




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#define ff_mdct_init FFT_NAME(ff_mdct_init)


  		




  
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#define ff_mdct_end  FFT_NAME(ff_mdct_end)


  		




  
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int ff_mdct_init(FFTContext *s, int nbits, int inverse, double scale);


  		




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void ff_imdct_calc_c(FFTContext *s, FFTSample *output, const FFTSample *input);


  		




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void ff_imdct_half_c(FFTContext *s, FFTSample *output, const FFTSample *input);


  		




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void ff_mdct_calc_c(FFTContext *s, FFTSample *output, const FFTSample *input);


  		




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void ff_mdct_end(FFTContext *s);


  		




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#endif /* AVCODEC_FFT_H */


  		












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