EncodeDCIntra

Encodes one DC coefficient for intra coded block.

Syntax

IppStatus ippiEncodeDCIntra_MPEG4_16s1u(Ipp16s DC, Ipp8u** ppBitStream, int* pBitOffset, int blockType);

Parameters

DC	DC coefficient to be encoded.
ppBitStream	Pointer to the pointer to the current byte in the bitstream buffer. The pointer is updated by the function.
pBitOffset	Pointer to the bit position in the byte pointed by **ppBitStream. The pointer is updated by the function.
blockType	Indicates the block type, takes one of the following values: IPPVC_BLOCK_LUMA - for luma and alpha blocks, IPPVC_BLOCK_CHROMA - for chroma blocks.

Description

The function ippiEncodeDCIntra_MPEG4_16s1u is declared in the ippvc.h header file. This function performs VLC encoding of the DC coefficient only for one intra coded block using tables B.13, B14, B.15 specified in [ISO14496].

This function is used in the MPEG-4 encoder included into Intel IPP Samples. See introduction to MPEG-4.

Return Values

ippStsNoErr	Indicates no error.
ippStsNullPtrErr	Indicates an error when at least one input pointer is NULL.
ippStsBitOffsetErr	Indicates an error condition if *pBitOffset is out of the range [0, 7].