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
FFTContext *	av_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)

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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.