TransformDequantChromaDC

Performs integer inverse transformation and dequantization for 2x2 chroma DC coefficients.

Syntax

IppStatus ippiTransformDequantChromaDC_H264_16s_C1I(Ipp16s* pSrcDst, Ipp32s QP);

Parameters

pSrcDst	Pointer to the initial coefficients and resultant chroma DC (2x2 block).
QP	Quantization parameter.

Description

The function ippiTransformDequantChromaDC_H264_16s_C1I is declared in the ippvc.h file. This function performs integer inverse transformation and dequantization for 2x2 chroma DC coefficients in accordance with 8.5.7 of [JVTG050].

The argument QP stands here for a chroma quantization parameter, which is designated in JVT-G050 as _QPC.

This function is used in the H.264 encoder 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.
ippStsOutOfRangeErr	Indicates an error condition if QP is less than 1 or greater than 51.