Intel® Integrated Performance Primitives (Intel® IPP) Developer Guide and Reference
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YCbCr422ToYCrCb420
Converts 4:2:2 YCbCr image to 4:2:0 YCrCb image.
Syntax
IppStatus ippiYCbCr422ToYCrCb420_8u_C2P3R(const Ipp8u* pSrc, int srcStep, Ipp8u* pDst[3], int dstStep[3], IppiSize roiSize);
IppStatus ippiYCbCr422ToYCrCb420_8u_C2P2R(const Ipp8u* pSrc, int srcStep, Ipp8u* pDstY, int dstYStep, Ipp8u* pDstCrCb, int dstUVStep, IppiSize roiSize);
Include Files
ippcc.h
Domain Dependencies
Headers: ippcore.h, ippvm.h, ipps.h, ippi.h
Libraries: ippcore.lib, ippvm.lib, ipps.lib, ippi.lib
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 of the destination image. | 
| pDstY | Pointer to the destination image Y plane. | 
| dstStep | Array of distances, in bytes, between the starting points of consecutive lines in the destination image planes. | 
| dstYStep | Array of distances, in bytes, between the starting points of consecutive lines in the destination image Y plane. | 
| dstUVStep | Array of distances, in bytes, between the starting points of consecutive lines in the destination image UV plane. | 
| roiSize | Size of the source and destination ROI in pixels, height and width should be multiple of 2. | 
Description
This function operates with ROI (see Regions of Interest in Intel IPP).
This function converts the 4:2:2 two-channel image pSrc that has the following sequence of samples: Y0, Cb0, Y1, Cr0, Y2, Cb1, Y3, Cr1, ... to the 4:2:0 three-plane image pDst with the following order of pointers: Y-plane, Cr-plane, Cb-plane (see Table “Pixel-Order Image Formats” and Table “Planar Image Formats”).
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. |