fft.c File Reference

#include "fft.h"
#include <glib.h>
#include <stdlib.h>
#include <math.h>

Go to the source code of this file.

Classes
struct	fft_state
Defines
#define	PI   3.14159265358979323846
Functions
static void	fft_prepare (const sound_sample *input, float *re, float *im)
static void	fft_calculate (float *re, float *im)
static void	fft_output (const float *re, const float *im, float *output)
static int	reverseBits (unsigned int initial)
fft_state *	fft_init (void)
void	fft_perform (const sound_sample *input, float *output, fft_state *state)
void	fft_close (fft_state *state)
Variables
static unsigned int	bitReverse [FFT_BUFFER_SIZE]
static float	sintable [FFT_BUFFER_SIZE/2]
static float	costable [FFT_BUFFER_SIZE/2]

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Define Documentation

#define PI   3.14159265358979323846

Definition at line 46 of file fft.c.

Referenced by fft_init().

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Function Documentation

static void fft_calculate	(	float *	re,
		float *	im
	)			[static]

Definition at line 213 of file fft.c.

Referenced by fft_perform().

void fft_close

(

fft_state *

state

)

Definition at line 150 of file fft.c.

fft_state* fft_init

(

void

)

Definition at line 96 of file fft.c.

Referenced by calc_freq().

static void fft_output	(	const float *	re,
		const float *	im,
		float *	output
	)			[static]

Definition at line 190 of file fft.c.

Referenced by fft_perform().

void fft_perform	(	const sound_sample *	input,
		float *	output,
		fft_state *	state
	)

Definition at line 134 of file fft.c.

Referenced by calc_freq().

static void fft_prepare	(	const sound_sample *	input,
		float *	re,
		float *	im
	)			[static]

Definition at line 164 of file fft.c.

Referenced by fft_perform().

static int reverseBits

(

unsigned int

initial

)

[static]

Definition at line 261 of file fft.c.

Referenced by fft_init().

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Variable Documentation

unsigned int bitReverse[FFT_BUFFER_SIZE] [static]

Definition at line 74 of file fft.c.

Referenced by fft_init(), and fft_prepare().

float costable[FFT_BUFFER_SIZE/2] [static]

Definition at line 79 of file fft.c.

Referenced by fft_calculate(), and fft_init().

float sintable[FFT_BUFFER_SIZE/2] [static]

Definition at line 78 of file fft.c.

Referenced by fft_calculate(), and fft_init().