FFmpeg
Macros | Functions
mdct_template.c File Reference
#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"

Go to the source code of this file.

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. 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_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.

Definition in file mdct_template.c.

Macro Definition Documentation

◆ RSCALE

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

Definition at line 36 of file mdct_template.c.

Function Documentation

◆ ff_mdct_init()

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

init MDCT or IMDCT computation.

Definition at line 44 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
outputN/2 samples
inputN/2 samples

Definition at line 101 of file mdct_template.c.

Referenced by ff_imdct_calc_c().

◆ 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
outputN samples
inputN/2 samples

Definition at line 143 of file mdct_template.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
inputN samples
outN/2 samples

Definition at line 163 of file mdct_template.c.

◆ ff_mdct_end()

av_cold void ff_mdct_end ( FFTContext s)

Definition at line 205 of file mdct_template.c.

Referenced by ff_mdct_init().