FFmpeg 5.1.6
Data Structures | Typedefs | Enumerations | Functions
avfft.h File Reference

FFT functions. More...

Go to the source code of this file.

Data Structures

struct  FFTComplex
 

Typedefs

typedef float FFTSample
 
typedef struct FFTContext FFTContext
 
typedef struct RDFTContext RDFTContext
 
typedef struct DCTContext DCTContext
 

Enumerations

enum  RDFTransformType { DFT_R2C , IDFT_C2R , IDFT_R2C , DFT_C2R }
 
enum  DCTTransformType { DCT_II = 0 , DCT_III , DCT_I , DST_I }
 

Functions

FFTContextav_fft_init (int nbits, int inverse)
 Set up a complex FFT. More...
 
void av_fft_permute (FFTContext *s, FFTComplex *z)
 Do the permutation needed BEFORE calling ff_fft_calc(). More...
 
void av_fft_calc (FFTContext *s, FFTComplex *z)
 Do a complex FFT with the parameters defined in av_fft_init(). More...
 
void av_fft_end (FFTContext *s)
 
FFTContextav_mdct_init (int nbits, int inverse, double scale)
 
void av_imdct_calc (FFTContext *s, FFTSample *output, const FFTSample *input)
 
void av_imdct_half (FFTContext *s, FFTSample *output, const FFTSample *input)
 
void av_mdct_calc (FFTContext *s, FFTSample *output, const FFTSample *input)
 
void av_mdct_end (FFTContext *s)
 
RDFTContextav_rdft_init (int nbits, enum RDFTransformType trans)
 Set up a real FFT. More...
 
void av_rdft_calc (RDFTContext *s, FFTSample *data)
 
void av_rdft_end (RDFTContext *s)
 
DCTContextav_dct_init (int nbits, enum DCTTransformType type)
 Set up DCT. More...
 
void av_dct_calc (DCTContext *s, FFTSample *data)
 
void av_dct_end (DCTContext *s)
 

Detailed Description

FFT functions.

Definition in file avfft.h.