topic Hi Chew, in Intel® Integrated Performance Primitives

How to use ippiYCbCr420ToRGB_8u_P2C3R

Chew_E_ — Thu, 01 Nov 2012 08:34:17 GMT

Hi,

Based from this link (http://software.intel.com/en-us/forums/topic/282021), I can use ippiYCbCr420ToRGB_8u_P2C3R to convert NV12 to BGR but I can't find any sample code on how to use the API. Could someone give me a simple code snippet? Say a 640x480 NV12 frame to a BGR of the same size? I'm new to IPP (using 7.1 now). What I'm particularly unsure of are these: const Ipp8u* pY, int pYStep, const Ipp8u* pCbCr, int CbCrStep parameters.

Thanks.

Chew

Hi Chew,

Ying_H_Intel — Fri, 02 Nov 2012 06:58:12 GMT

Hi Chew, You may refer to IPPi manul page 208 to see the YCbCr420 2 plane format. The width of Y and interlace UV is same, so the step is same Suppose your NV12 data are stored in to 2 plane . pYdata, and pUVData. const Ipp8u* pY = pYData; int pYStep = 640 pCbCr=pUVData int CbCrStep=640 then as the http://software.intel.com/en-us/forums/topic/333526. do the conversion. And regarding the code sample, you can refer to ipp sample package, like in ipp image processing ippiDemo sample , ipp UMC sample, there are almost of kind of color conversion functions demo. Best Regards, Ying Some code from http://software.intel.com/en-us/forums/topic/333526 Const Ipp8u* (pYUV[3]) = {0,0,0}; pYUV[0] = pData; pYUV[1] = pYUV[0] + 1920*1080; pYUV[2] = pYUV[1] + 1920*1080/4 int YUVStep[3] = {1920,960,960}; Int step; IppiSize roi = {1920,1080}; Ipp8u* pBuf = ippiMalloc_8u_C3(1920,1080, &step); ippiYUV420ToBGR_8u_P3C3R(pYUV, YUVStep, pBuf, step, roi};

Hi Ying,

Chew_E_ — Wed, 07 Nov 2012 09:27:26 GMT

Hi Ying, Thank you very much for you reply. Actually, I was expecting some sample codes from the evaluation download but the only sample in there was Life.zip which is kind of limited. I'm assuming now that these samples you mentioned are to be downloaded separately. I'll check that later.