FIRMRGetSize

Computes the size of the context structure and work buffer for multi-rate FIR filtering.

Syntax

Case 1: Operation on a signal that has the same data type as the coefficients

IppStatus ippsFIRMRGetSize(int tapsLen, int upFactor, int downFactor, IppDataType tapsType, int* pSpecSize, int* pBufSize);

Case 2: Operation on a signal that has a data type different from the data type of the coefficients

IppStatus ippsFIRMRGetSize32f_32fc(int tapsLen, int upFactor, int downFactor, int* pSpecSize, int* pBufSize);

ipps.h

Headers: ippcore.h, ippvm.h

Libraries: ippcore.lib, ippvm.lib

tapsLen	Length of the FIR filter.
upFactor	Multi-rate up factor.
downFactor	Multi-rate down factor.
tapsType	Data type of the coefficients. Supported values are Ipp32f, Ipp32fc, Ipp64f, and Ipp64fc.
pSpecSize	Pointer to the size of the FIR specification structure.
pBufSize	Pointer to the size of the work buffer required for FIR filtering.

This function computes the following:

Size of the internal specification structure for multi-rate FIR filtering. The structure can be shared between all threads of the application.
Size of the work buffer for each thread.

For an example on how to use this function, refer to the example provided with the FIRMR function description.

ippStsNoErr	Indicates no error.
ippStsNullPtrErr	Indicates an error when one of the specified pointers is NULL.
ippStsSizeErr	Indicates an error when the tapsLen value is less than or equal to zero.
ippStsDataTypeErr	Indicates an error when the specified taps type is not supported.
ippStsFIRMRFactorErr	Indicates an error when the upFactor value or the downFactor value is less than zero.
ippStsExceededSizeErr	Indicates an error when the size of the work buffer exceeds the maximum of the data type positive value pointed by *int pBufSize.