QMFInit

Initializes the QMF filter state memory.

Syntax

IppStatus ippsQMFInit_RTA_32f(IppQMFState_RTA_32f* pQMFMem, int nTaps);

Parameters

pQMFMem	Pointer to the QMF filter state structure.
nTaps	Number of taps, possible values are: 24, 48.

Description

The function ippsQMFInit_RTA is declared in the ippsc.h file.

This function sets the number of filter taps nTaps and initializes Quadrature Mirror Filter (QMF) state memory pQMFMem that is used by the functions ippsQMFEncode_RTA and ippsQMFDecode_RTA. The size of the memory must be calculated by calling the function ippsQMFGetStateSize_RTA beforehand.

Return Values

ippStsNoErr	Indicates no error.
IppStsNullPtrErr	Indicates an error when pQMFMem pointer is NULL.
IppStsRangeErr	Indicates an error when nTaps is not equal to 24 or 48.