QuantInvIntra

Performs inverse quantization for intra frames according to MPEG-2 standard.

Syntax

IppStatus ippiQuantInvIntra_MPEG2_16s_C1I(Ipp16s* pSrcDst, int QP, Ipp16s* pQPMatrix);

Parameters

pSrcDst	Pointer to the start of the block.
QP	Quantizer scale factor read from the bit stream.
pQPMatrix	Pointer to the weighting matrix imposed by the MPEG standard or user-defined.

Description

This function is declared in the ippvc.h header file. The function ippiQuantInvIntra_MPEG2_16s_C1I multiplies the DCT coefficients from pSrcDst by QP and by corresponding values from pQPMatrix and sends the result back to pSrcDst.

This function is used in the MPEG-2 encoder included into Intel IPP Samples. See introduction to MPEG-1 and MPEG-2.

Return Values

ippStsNoErr	Indicates no error.
ippStsNullPtrErr	Indicates an error when at least one input pointer is NULL.