Add8x8HP

Adds blocks interpolated with half-pixel accuracy prediction to difference with saturation.

Syntax

IppStatus ippiAdd8x8HP_16s8u_C1RS(const Ipp16s* pSrc1 , int src1Step, Ipp8u* pSrc2, int src2Step, Ipp8u* pDst, int dstStep , int acc, int rounding);

Parameters

pSrc1	Pointer to the source block of differences.
src1Step	Distance in bytes between starts of the consecutive lines in the pSrc1 plane.
pSrc2	Pointer to the source block of prediction.
src2Step	Distance in bytes between starts of the consecutive lines in the pSrc2 plane.
pDst	Pointer to the second source/destination block.
dstStep	Distance in bytes between starts of the consecutive lines in the destination plane.
acc	Parameter that determines half-pixel accuracy.
rounding	Parameter that determines type of rounding for pixel interpolation; may be 0 or 1.

Description

The function ippiAdd8x8HP_16s8u_C1RS is declared in the ippvc.h file. This function adds 16s data from pSrc1 block to the data from pSrc2 block interpolated with half-pixel accuracy with saturation. It can be used in motion compensation process to add a reconstructed block of prediction errors to the predictor. Parameter rounding has the same meaning as RTYPE in [ITUH263] and vop_rounding_type in [ISO14496]. Parameter acc is a two-bit value. Bit 0 defines half-pixel offset in horizontal direction and bit 1 defines half-pixel offset in vertical direction. The process of half-pixel interpolation is described in [ITUH263] subclause 6.1.2 and in [ISO14496] subclause 7.6.2.1.

This function is used in the H.263 and MPEG-4 encoders and decoders included into Intel IPP Samples. See introduction to Motion Compensation.

Return Values

ippStsNoErr	Indicates no error.
ippStsNullPtrErr	Indicates an error when at least one input pointer is NULL.