frequency.c File Reference

Include dependency graph for frequency.c:

Classes
struct	sFrequencyState
Defines
#define	FFT_BUFFER_SIZE_LOG   9
#define	FFT_BUFFER_SIZE   (1 << FFT_BUFFER_SIZE_LOG)
#define	PI   3.14159265358979323846
Typedefs
typedef short int	sound_sample
Functions
static void	FrequencyPrepare (const sound_sample *input, float *re, float *im)
static void	FrequencyCalculate (float *re, float *im)
static void	FrequencyOutput (const float *re, const float *im, float *output)
static int	reverseBits (unsigned int initial)
sFrequencyState *	fft_init (void)
void	fft_perform (const sound_sample *input, float *output, sFrequencyState *state)
void	fft_close (sFrequencyState *state)
static void	calc_stereo_pcm (short dest[2][512], short src[2][512], int nch)
static void	calc_mono_pcm (short dest[2][512], short src[2][512], int nch)
static void	calc_freq (short *dest, short *src)
static void	calc_mono_freq (short dest[2][256], short src[2][512], int nch)
static void	calc_stereo_freq (short dest[2][256], short src[2][512], int nch)
HRESULT	ISS_AudioConvertPCMToFrequency (unsigned int uiDesiredChannels, unsigned int uiPCMChannels, short ucPCMAudioData[2][512], short ucFrequencyBuffer[2][256])
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 FFT_BUFFER_SIZE   (1 << FFT_BUFFER_SIZE_LOG)

#define FFT_BUFFER_SIZE_LOG   9

#define PI   3.14159265358979323846

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Typedef Documentation

typedef short int sound_sample

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Function Documentation

static void calc_freq	(	short *	dest,
		short *	src
	)			[static]

static void calc_mono_freq	(	short	dest[2][256],
		short	src[2][512],
		int	nch
	)			[static]

static void calc_mono_pcm	(	short	dest[2][512],
		short	src[2][512],
		int	nch
	)			[static]

static void calc_stereo_freq	(	short	dest[2][256],
		short	src[2][512],
		int	nch
	)			[static]

static void calc_stereo_pcm	(	short	dest[2][512],
		short	src[2][512],
		int	nch
	)			[static]

void fft_close

(

sFrequencyState *

state

)

sFrequencyState* fft_init

(

void

)

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

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

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

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

HRESULT ISS_AudioConvertPCMToFrequency	(	unsigned int	uiDesiredChannels,
		unsigned int	uiPCMChannels,
		short	ucPCMAudioData[2][512],
		short	ucFrequencyBuffer[2][256]
	)

empty

static int reverseBits

(

unsigned int

initial

)

[static]

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Variable Documentation

unsigned int bitReverse[FFT_BUFFER_SIZE] [static]

float costable[FFT_BUFFER_SIZE/2] [static]

float sintable[FFT_BUFFER_SIZE/2] [static]

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