mdct_template.c File Reference

MDCT/IMDCT transforms. More...

#include <stdlib.h>
#include <string.h>
#include "libavutil/common.h"
#include "libavutil/libm.h"
#include "libavutil/mathematics.h"
#include "fft.h"
#include "fft-internal.h"

Macros
#define	RSCALE(x, y)   ((x) + (y))

Functions
av_cold int	ff_mdct_init (FFTContext *s, int nbits, int inverse, double scale)
	init MDCT or IMDCT computation.
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_imdct_calc_c (FFTContext *s, FFTSample *output, const FFTSample *input)
	Compute inverse MDCT of size N = 2^nbits. More...
void	ff_mdct_calc_c (FFTContext *s, FFTSample *out, const FFTSample *input)
	Compute MDCT of size N = 2^nbits. More...
av_cold void	ff_mdct_end (FFTContext *s)

Detailed Description

MDCT/IMDCT transforms.

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

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

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