Intel® Integrated Performance Primitives Developer Guide and Reference

ID 790148
Date 11/07/2023
Public

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Document Table of Contents

CbYCr422ToYCbCr420_Interlace

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

Syntax

IppStatus ippiCbYCr422ToYCbCr420_Interlace_8u_C2P3R(const Ipp8u* pSrc, int srcStep, Ipp8u* pDst[3], int dstStep[3], 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 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.

Description

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;

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 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.