libavcodec/avfft.c File Reference

#include "libavutil/mem.h"
#include "avfft.h"
#include "fft.h"
#include "rdft.h"
#include "dct.h"

Go to the source code of this file.

Functions

FFTContextav_fft_init (int nbits, int inverse)
 Set up a complex FFT.
void av_fft_permute (FFTContext *s, FFTComplex *z)
 Do the permutation needed BEFORE calling ff_fft_calc().
void av_fft_calc (FFTContext *s, FFTComplex *z)
 Do a complex FFT with the parameters defined in av_fft_init().
void av_fft_end (FFTContext *s)


Function Documentation

void av_fft_calc ( FFTContext s,
FFTComplex z 
)

Do a complex FFT with the parameters defined in av_fft_init().

The input data must be permuted before. No 1.0/sqrt(n) normalization is done.

Definition at line 42 of file avfft.c.

void av_fft_end ( FFTContext s  ) 

Definition at line 47 of file avfft.c.

FFTContext* av_fft_init ( int  nbits,
int  inverse 
)

Set up a complex FFT.

Parameters:
nbits log2 of the length of the input array
inverse if 0 perform the forward transform, if 1 perform the inverse

Definition at line 27 of file avfft.c.

void av_fft_permute ( FFTContext s,
FFTComplex z 
)

Do the permutation needed BEFORE calling ff_fft_calc().

Definition at line 37 of file avfft.c.


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