fft.c File Reference

Include dependency graph for fft.c:

Defines
#define	PI   3.14159265358979323846
Functions
static void	fft_prepare (const sound_sample *input, float *re, float *im, const unsigned int *bitReverse)
static void	fft_calculate (float *re, float *im, const float *costable, const float *sintable)
static void	fft_output (const float *re, const float *im, float *output)
static int	reverseBits (unsigned int initial)
fft_state *	visual_fft_init (void)
void	fft_perform (const sound_sample *input, float *output, fft_state *state)
void	fft_close (fft_state *state)

---

Define Documentation

#define PI   3.14159265358979323846

Referenced by visual_fft_init().

---

Function Documentation

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

References FFT_BUFFER_SIZE, FFT_BUFFER_SIZE_LOG, and i.

Referenced by fft_perform().

void fft_close

(

fft_state *

state

)

Referenced by spectrometer_Run(), and spectrum_Run().

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

References FFT_BUFFER_SIZE.

Referenced by fft_perform().

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

References _struct_fft_state::bitReverse, _struct_fft_state::costable, fft_calculate(), fft_output(), fft_prepare(), _struct_fft_state::imag, _struct_fft_state::real, and _struct_fft_state::sintable.

Referenced by spectrometer_Run(), and spectrum_Run().

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

References FFT_BUFFER_SIZE, and i.

Referenced by fft_perform().

static int reverseBits

(

unsigned int

initial

)

[static]

References FFT_BUFFER_SIZE_LOG.

Referenced by visual_fft_init().

fft_state* visual_fft_init

(

void

)

References _struct_fft_state::bitReverse, _struct_fft_state::costable, FFT_BUFFER_SIZE, i, PI, reverseBits(), and _struct_fft_state::sintable.

Referenced by spectrometer_Run(), and spectrum_Run().