DCT4Init

Initializes the DCT-IV structure.

Syntax

IppStatus ippgDCT4Init_32f(IppgDCT4Spec_32f** ppSpec, int len, Ipp8u* pMem);

IppStatus ippgDCT4Init_64f(IppgDCT4Spec_64f** ppSpec, int len, Ipp8u* pMem);

Parameters

ppSpec	Double pointer to the DCT-IV specification structure to be created.
len	Number of samples in the transform.
pMem	Pointer to the area for the DCT-IV specification structure.

Description

The function ippgDCT4Init is declared in the ippgen.h file. This function initializes the DCT-IV specification structure ppSpec with the length of transform len.

Before calling this function the memory must be allocated for the DCT-IV specification structure. The size of the DCT-IV specification structure must be computed by the function ippgDCT4GetSize beforehand.

This specification structure is used by the function ippgDCT4.

Return Values

ippStsNoErr	Indicates no error.
ippStsNullPtrErr	Indicates an error if the ppSpec or pMem pointer is NULL.
ippStsSizeErr	Indicates an error if len is less than or equal to 0.