Performs intra prediction for a 8x8 chroma component.
Syntax
IppStatus ippiPredictIntraChroma8x8_H264_8u_C1IR(Ipp8u* pSrcDst, Ipp32s srcdstStep, IppIntraChroma8x8PredMode predMode, Ipp32s availability);
Parameters
pSrcDst |
Pointer to the 8x8 chroma-block, which is inside U-frame or V-frame and which is under reconstruction (destination array). |
srcdstStep |
Distance in bytes between starts of the consecutive lines in the destination chroma-frame. |
predMode |
Prediction mode of the Intra_chroma prediction process for chroma samples. |
availability |
Flag that specifies the availability of the macroblocks used for prediction. |
Description
The function ippiPredictIntraChroma8x8_H264_8u_C1IR is declared in the ippvc.h file. This function performs intra prediction for a 8x8 chroma component in accordance with 8.3.3 of [JVTG050] in a given prediction mode predMode (See enumeration IppIntraChromaPredMode_H264).
The flag availability is computed as follows:
B1*IPP_LEFT + B2*IPP_UPPER_LEFT + B3*IPP_UPPER,
where the constants IPP_LEFT, IPP_UPPER_LEFT, IPP_UPPER are from IppLayoutFlag and the variables B1, B2, B3 may take the values of
0 - |
if the macroblock is unavailable for intra chroma prediction, |
1 - |
if the macroblock is available for intra chroma prediction. |
Return Values
ippStsNoErr |
Indicates no error. |
ippStsNullPtrErr |
Indicates an error condition if at least one of the specified pointers is NULL. |
ippStsOutOfRangeErr |
Indicates an error condition if predMode value falls outside [0,3]. |
ippStsStepErr |
Indicates an error condition if srcdstStep value is less than 8. |
ippStsLPCCalcErr |
Indicates an error condition if predMode is not allowed for this block. |