FFmpeg: libavcodec/avfft.h File Reference

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Data Structures | Typedefs | Enumerations | Functions

avfft.h File Reference

FFT functions. More...

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Data Structures

struct FFTComplex

Typedefs

typedef float FFTSample

Enumerations

enum RDFTransformType { DFT_R2C, IDFT_C2R, IDFT_R2C, DFT_C2R }

enum DCTTransformType { DCT_II = 0, DCT_III, DCT_I, DST_I }

Functions

FFTContext * av_fft_init (int nbits, int inverse)

Set up a complex FFT.

void av_fft_permute (FFTContext *s, FFTComplex *z)

Do the permutation needed BEFORE calling ff_fft_calc().

void av_fft_calc (FFTContext *s, FFTComplex *z)

Do a complex FFT with the parameters defined in av_fft_init().

void av_fft_end (FFTContext *s)

FFTContext * av_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)

RDFTContext * av_rdft_init (int nbits, enum RDFTransformType trans)

Set up a real FFT.

void av_rdft_calc (RDFTContext *s, FFTSample *data)

void av_rdft_end (RDFTContext *s)

DCTContext * av_dct_init (int nbits, enum DCTTransformType type)

Set up DCT.

void av_dct_calc (DCTContext *s, FFTSample *data)

void av_dct_end (DCTContext *s)

Detailed Description

FFT functions.

Definition in file avfft.h.

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