TransformDequantChromaDC_SISP

Performs integer inverse transformation and dequantization for 2x2 chroma DC coefficients in P macroblocks in SP slices or SI macroblocks.

Syntax

IppStatus ippiTransformDequantChromaDC_SISP_H264_16s_C1I(Ipp16s* pSrcDst, const Ipp16s* pDCPredict, Ipp32s qp, Ipp32s qs, Ipp32s Switch);

Parameters

pSrcDst	Pointer to array (size 4) of the prediction residual transform chroma DC coefficient - source/destination array.
pDCPredict	Pointer to array (size 4) of the of inter prediction DC samples for the current macroblock after inverse transform. Inverse transform of the inter prediction samples can be calculated using TransformPrediction_H264 function for each 4x4 block.
qp	Quantization parameter (QP. in [JVTG050]), which is used in the case of non-switching pictures.
qs	Quantization parameter (QS. in [JVTG050]).
Switch	Flag that is not equal to zero, if it switches pictures, and is equal to zero otherwise.

Description

The function ippiTransformDequantChromaDC_SISP_H264_16s_C1I is declared in the ippvc.h file. The function performs integer inverse transformation and dequantization for 2x2 chroma coefficients in P macroblocks in SP slices or SI macroblocks (8.6.1.2, 8.6.2.2 of [JVTG050]).

This function is used in the H.264 decoder included into Intel IPP Samples. See introduction to H.264.

Return Values

ippStsNoErr	Indicates no error.
ippStsNullPtrErr	Indicates an error condition if at least one of the specified pointers is NULL.