#include <stdint.h>
#include <stddef.h>

Data Structures
struct	AVComplexFloat

struct	AVComplexDouble

struct	AVComplexInt32

Typedefs
typedef void(*	av_tx_fn) (AVTXContext s, void out, void *in, ptrdiff_t stride)
	Function pointer to a function to perform the transform. More...

Enumerations
enum	AVTXType { AV_TX_FLOAT_FFT = 0, AV_TX_FLOAT_MDCT = 1, AV_TX_DOUBLE_FFT = 2, AV_TX_DOUBLE_MDCT = 3, AV_TX_INT32_FFT = 4, AV_TX_INT32_MDCT = 5 }

Functions
int	av_tx_init (AVTXContext *ctx, av_tx_fn tx, enum AVTXType type, int inv, int len, const void *scale, uint64_t flags)
	Initialize a transform context with the given configuration Currently power of two lengths from 2 to 131072 are supported, along with any length decomposable to a power of two and either 3, 5 or 15. More...

void	av_tx_uninit (AVTXContext **ctx)
	Frees a context and sets ctx to NULL, does nothing when ctx == NULL. More...

Typedef Documentation

◆ av_tx_fn

typedef void(* av_tx_fn) (AVTXContext *s, void *out, void *in, ptrdiff_t stride)

Function pointer to a function to perform the transform.

Note: Using a different context than the one allocated during av_tx_init() is not allowed.

Parameters

s	the transform context
out	the output array
in	the input array
stride	the input or output stride in bytes

The out and in arrays must be aligned to the maximum required by the CPU architecture. The stride must follow the constraints the transform type has specified.

Definition at line 92 of file tx.h.

Enumeration Type Documentation

◆ AVTXType

enum AVTXType

Enumerator
AV_TX_FLOAT_FFT	Standard complex to complex FFT with sample data type AVComplexFloat. Output is not 1/len normalized. Scaling currently unsupported. The stride parameter is ignored.
AV_TX_FLOAT_MDCT	Standard MDCT with sample data type of float and a scale type of float. Length is the frame size, not the window size (which is 2x frame) For forward transforms, the stride specifies the spacing between each sample in the output array in bytes. The input must be a flat array. For inverse transforms, the stride specifies the spacing between each sample in the input array in bytes. The output will be a flat array. Stride must be a non-zero multiple of sizeof(float).
AV_TX_DOUBLE_FFT	Same as AV_TX_FLOAT_FFT with a data type of AVComplexDouble.
AV_TX_DOUBLE_MDCT	Same as AV_TX_FLOAT_MDCT with data and scale type of double. Stride must be a non-zero multiple of sizeof(double).
AV_TX_INT32_FFT	Same as AV_TX_FLOAT_FFT with a data type of AVComplexInt32.
AV_TX_INT32_MDCT	Same as AV_TX_FLOAT_MDCT with data type of int32_t and scale type of float. Only scale values less than or equal to 1.0 are supported. Stride must be a non-zero multiple of sizeof(int32_t).

Definition at line 39 of file tx.h.

Function Documentation

◆ av_tx_init()

int av_tx_init	(	AVTXContext **	ctx,
		av_tx_fn *	tx,
		enum AVTXType	type,
		int	inv,
		int	len,
		const void *	scale,
		uint64_t	flags
	)

Initialize a transform context with the given configuration Currently power of two lengths from 2 to 131072 are supported, along with any length decomposable to a power of two and either 3, 5 or 15.

Parameters

ctx	the context to allocate, will be NULL on error
tx	pointer to the transform function pointer to set
type	type the type of transform
inv	whether to do an inverse or a forward transform
len	the size of the transform in samples
scale	pointer to the value to scale the output if supported by type
flags	currently unused