libavcodec/mdct.c File Reference

MDCT/IMDCT transforms. More...

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

Go to the source code of this file.

Defines
#define	RSCALE(x)   (x)
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.
void	ff_imdct_calc_c (FFTContext *s, FFTSample *output, const FFTSample *input)
	Compute inverse MDCT of size N = 2^nbits.
void	ff_mdct_calc_c (FFTContext *s, FFTSample *out, const FFTSample *input)
	Compute MDCT of size N = 2^nbits.
av_cold void	ff_mdct_end (FFTContext *s)

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Detailed Description

MDCT/IMDCT transforms.

Definition in file mdct.c.

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Define Documentation

#define RSCALE

(

x

)

(x)

Definition at line 35 of file mdct.c.

Referenced by ff_mdct_calc_c(), and ff_mdct_calcw_c().

---

Function Documentation

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 137 of file mdct.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 95 of file mdct.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 157 of file mdct.c.

av_cold void ff_mdct_end

(

FFTContext *

s

)

Definition at line 199 of file mdct.c.

av_cold int ff_mdct_init	(	FFTContext *	s,
		int	nbits,
		int	inverse,
		double	scale
	)

init MDCT or IMDCT computation.

Definition at line 43 of file mdct.c.