AVFixedDSPContext Struct Reference

#include <fixed_dsp.h>

Data Fields
void(*	vector_fmul_window_scaled )(int16_t *dst, const int32_t *src0, const int32_t *src1, const int32_t *win, int len, uint8_t bits)
	Overlap/add with window function. More...
void(*	vector_fmul_window )(int32_t *dst, const int32_t *src0, const int32_t *src1, const int32_t *win, int len)
	Overlap/add with window function. More...
void(*	vector_fmul )(int *dst, const int *src0, const int *src1, int len)
	Fixed-point multiplication that calculates the entry wise product of two vectors of integers and stores the result in a vector of integers. More...
void(*	vector_fmul_reverse )(int *dst, const int *src0, const int *src1, int len)
void(*	vector_fmul_add )(int *dst, const int *src0, const int *src1, const int *src2, int len)
	Calculate the entry wise product of two vectors of integers, add a third vector of integers and store the result in a vector of integers. More...
int(*	scalarproduct_fixed )(const int *v1, const int *v2, int len)
	Calculate the scalar product of two vectors of integers. More...
void(*	butterflies_fixed )(int *av_restrict v1, int *av_restrict v2, int len)
	Calculate the sum and difference of two vectors of integers. More...

Detailed Description

Definition at line 56 of file fixed_dsp.h.

Field Documentation

void(* AVFixedDSPContext::vector_fmul_window_scaled)(int16_t *dst, const int32_t *src0, const int32_t *src1, const int32_t *win, int len, uint8_t bits)

Overlap/add with window function.

Result is scaled down by "bits" bits. Used primarily by MDCT-based audio codecs. Source and destination vectors must overlap exactly or not at all.

Parameters

dst	result vector constraints: 16-byte aligned
src0	first source vector constraints: 16-byte aligned
src1	second source vector constraints: 16-byte aligned
win	half-window vector constraints: 16-byte aligned
len	length of vector constraints: multiple of 4
bits	scaling parameter

Definition at line 80 of file fixed_dsp.h.

Referenced by avpriv_alloc_fixed_dsp().

void(* AVFixedDSPContext::vector_fmul_window)(int32_t *dst, const int32_t *src0, const int32_t *src1, const int32_t *win, int len)

Overlap/add with window function.

Used primarily by MDCT-based audio codecs. Source and destination vectors must overlap exactly or not at all.

Parameters

dst	result vector constraints: 32-byte aligned
src0	first source vector constraints: 16-byte aligned
src1	second source vector constraints: 16-byte aligned
win	half-window vector constraints: 16-byte aligned
len	length of vector constraints: multiple of 4

Definition at line 98 of file fixed_dsp.h.

Referenced by avpriv_alloc_fixed_dsp().

void(* AVFixedDSPContext::vector_fmul)(int *dst, const int *src0, const int *src1, int len)

Fixed-point multiplication that calculates the entry wise product of two vectors of integers and stores the result in a vector of integers.

Parameters

dst	output vector constraints: 32-byte aligned
src0	first input vector constraints: 32-byte aligned
src1	second input vector constraints: 32-byte aligned
len	number of elements in the input constraints: multiple of 16

Definition at line 113 of file fixed_dsp.h.

Referenced by avpriv_alloc_fixed_dsp().

void(* AVFixedDSPContext::vector_fmul_reverse)(int *dst, const int *src0, const int *src1, int len)

Definition at line 116 of file fixed_dsp.h.

Referenced by avpriv_alloc_fixed_dsp().

void(* AVFixedDSPContext::vector_fmul_add)(int *dst, const int *src0, const int *src1, const int *src2, int len)

Calculate the entry wise product of two vectors of integers, add a third vector of integers and store the result in a vector of integers.

Parameters

dst	output vector constraints: 32-byte aligned
src0	first input vector constraints: 32-byte aligned
src1	second input vector constraints: 32-byte aligned
src2	third input vector constraints: 32-byte aligned
len	number of elements in the input constraints: multiple of 16

Definition at line 132 of file fixed_dsp.h.

Referenced by avpriv_alloc_fixed_dsp().

int(* AVFixedDSPContext::scalarproduct_fixed)(const int *v1, const int *v2, int len)

Calculate the scalar product of two vectors of integers.

Parameters

v1	first vector, 16-byte aligned
v2	second vector, 16-byte aligned
len	length of vectors, multiple of 4

Returns

sum of elementwise products

Definition at line 144 of file fixed_dsp.h.

Referenced by avpriv_alloc_fixed_dsp().

void(* AVFixedDSPContext::butterflies_fixed)(int *av_restrict v1, int *av_restrict v2, int len)

Calculate the sum and difference of two vectors of integers.

Parameters

v1	first input vector, sum output, 16-byte aligned
v2	second input vector, difference output, 16-byte aligned
len	length of vectors, multiple of 4

Definition at line 153 of file fixed_dsp.h.

Referenced by avpriv_alloc_fixed_dsp(), ff_fixed_dsp_init_x86(), and filter_frame_fixed().

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The documentation for this struct was generated from the following file:

• libavutil/fixed_dsp.h