Intel® Integrated Performance Primitives 2017 Update 3 Developer Reference
Converts interlaced 4:2:2 CbYCr image to 4:2:0 YCbCr image.
IppStatus ippiCbYCr422ToYCbCr420_Interlace_8u_C2P3R(const Ipp8u* pSrc, int srcStep, Ipp8u* pDst[3], int dstStep[3], IppiSize roiSize);
ippcc.h
Headers: ippcore.h, ippvm.h, ipps.h, ippi.h
Libraries: ippcore.lib, ippvm.lib, ipps.lib, ippi.lib
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 destination image. |
dstStep |
Array of distances in bytes between starts of consecutive lines in each plane for a three-plane destination image. |
roiSize |
Size of the source and destination ROI in pixels, its width must be multiple of 2, and height must be multiple of 4. |
This function operates with ROI (see Regions of Interest in Intel IPP ).
This function converts interlaced 4:2:2CbYCr two-channel image pSrc to the 4:2:0YCbCr 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.
The conversion is performed in accordance with the following formulas:
Y1dest = Y1src;
Cb0(Cr0)dest = (3*Cb0(Cr0)src + Cb2(Cr2)src + 2)/4;
Cb1(Cr1)dest = (Cb1(Cr1)src + 3*Cb3(Cr3)src + 2)/4;
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 roiSize.width is less than 2, or roiSize.height is less than 4. |
ippStsDoubleSize |
Indicates a warning if roiSize.width is not multiple of 2, or roiSize.height is not multiple of 4. |