CbYCr422ToYCbCr420

Converts 4:2:2 CbYCr image to 4:2:0 YCbCr image.

Syntax

IppStatus ippiCbYCr422ToYCbCr420_8u_C2P3R(const Ipp8u* pSrc, int srcStep, Ipp8u* pDst[3], int dstStep[3], IppiSize roiSize);

IppStatus ippiCbYCr422ToYCbCr420_8u_C2P2R(const Ipp8u* pSrc, int srcStep, Ipp8u* pDstY, int dstYStep,Ipp8u* pDstCbCr, int dstCbCrStep, IppiSize roiSize);

Parameters

pSrc	Pointer to the source image ROI.
srcStep	Distance in bytes between starts of consecutive lines in the source image.
pDst	Array of pointers to the ROI in each plane for a three-plane destination image.
dstStep	Array of distances in bytes between starts of consecutive lines in each plane for a three-plane destination image.
pDstY	Pointer to the ROI in the luminance plane for a two-plane destination image.
dstYStep	Distance in bytes between starts of consecutive lines in the luminance plane of a destination image.
pDstCbCr	Pointer to the ROI in the interleaved chrominance plane for a two-plane destination image.
dstCbCrStep	Distance in bytes between starts of consecutive lines in the chrominance plane of a destination image.
roiSize	Size of the source and destination ROI in pixels, height and width should be multiple of 2.

Description

The function ippiCbYCr422ToYCbCr420 is declared in the ippcc.h file. It operates with ROI (see Regions of Interest in Intel IPP).

This function converts the 4:2:2 CbYCr two-channel image pSrc to the 4:2:0 YCbCr two- or three-plane image pDst (see Table “Pixel-Order Image Formats” and Table “Planar Image Formats”). The source image has the following sequence of samples: Cb0, Y0, Cr0, Y1, Cb1, Y2, Cr1, Y3, Cb2, ... . Three-plane destination image has the following order of pointers: Y-plane, Cb-plane, Cr-plane. Two-plane destination image contains luminance samples Y0, Y1, Y2, ... in the first plane pDstY, and interleaved chrominance samples Cb0, Cr0, Cb1, Cr1, ... in the second plane pDstCbCr.

Return Values

ippStsNoErr	Indicates no error. Any other value indicates an error.
ippStsNullPtrErr	Indicates an error condition if any of the specified pointers is NULL.
ippStsSizeErr	Indicates an error condition if any field of the roiSize is less than 2.