fft-internal.h File Reference

#include "libavutil/mathematics.h"
#include "fft.h"

Go to the source code of this file.

Macros
#define	FIX15(v)   (v)
#define	sqrthalf   (float)M_SQRT1_2
#define	BF(x, y, a, b)
#define	CMUL(dre, dim, are, aim, bre, bim)
#define	ff_imdct_calc_c   FFT_NAME(ff_imdct_calc_c)
#define	ff_imdct_half_c   FFT_NAME(ff_imdct_half_c)
#define	ff_mdct_calc_c   FFT_NAME(ff_mdct_calc_c)

Functions
void	ff_imdct_calc_c (FFTContext *s, FFTSample *output, const FFTSample *input)
	Compute inverse MDCT of size N = 2^nbits. More...
void	ff_imdct_half_c (FFTContext *s, FFTSample *output, const FFTSample *input)
	Compute the middle half of the inverse MDCT of size N = 2^nbits, thus excluding the parts that can be derived by symmetry. More...
void	ff_mdct_calc_c (FFTContext *s, FFTSample *output, const FFTSample *input)
	Compute MDCT of size N = 2^nbits. More...

Macro Definition Documentation

FIX15

#define FIX15

(

v

)

(v)

Definition at line 27 of file fft-internal.h.

sqrthalf

#define sqrthalf   (float)M_SQRT1_2

Definition at line 28 of file fft-internal.h.

BF

#define BF	(		x,
			y,
			a,
			b
	)

Value:

        do {                     \
        x = a - b;                              \
        y = a + b;                              \
    } while (0)

Definition at line 30 of file fft-internal.h.

CMUL

#define CMUL	(		dre,
			dim,
			are,
			aim,
			bre,
			bim
	)

Value:

        do { \
        (dre) = (are) * (bre) - (aim) * (bim);  \
        (dim) = (are) * (bim) + (aim) * (bre);  \
    } while (0)

Definition at line 35 of file fft-internal.h.

ff_imdct_calc_c

#define ff_imdct_calc_c   FFT_NAME(ff_imdct_calc_c)

Definition at line 54 of file fft-internal.h.

ff_imdct_half_c

#define ff_imdct_half_c   FFT_NAME(ff_imdct_half_c)

Definition at line 55 of file fft-internal.h.

ff_mdct_calc_c

#define ff_mdct_calc_c   FFT_NAME(ff_mdct_calc_c)

Definition at line 56 of file fft-internal.h.

Function Documentation

ff_imdct_calc_c()

void ff_imdct_calc_c	(	FFTContext *	s,
		FFTSample *	output,
		const FFTSample *	input
	)

Compute inverse MDCT of size N = 2^nbits.

Parameters

output	N samples
input	N/2 samples

Definition at line 143 of file mdct_template.c.

ff_imdct_half_c()

void ff_imdct_half_c	(	FFTContext *	s,
		FFTSample *	output,
		const FFTSample *	input
	)

Compute the middle half of the inverse MDCT of size N = 2^nbits, thus excluding the parts that can be derived by symmetry.

Parameters

output	N/2 samples
input	N/2 samples

Definition at line 101 of file mdct_template.c.

Referenced by ff_imdct_calc_c().

ff_mdct_calc_c()

void ff_mdct_calc_c	(	FFTContext *	s,
		FFTSample *	out,
		const FFTSample *	input
	)

Compute MDCT of size N = 2^nbits.

Parameters

input	N samples
out	N/2 samples

Definition at line 163 of file mdct_template.c.