DecodeHuffman8x8

Performs Huffman baseline decoding of 8x8 block of the quantized DCT Coefficients.

Syntax

IppStatus ippiDecodeHuffman8x8_JPEG_1u16s_C1(const Ipp8u* pSrc, int srcLenBytes, int* pSrcCurrPos, Ipp16s* pDst, Ipp16s* pLastDC, int* pMarker, const IppiDecodeHuffmanSpec* pDcTable, const IppiDecodeHuffmanSpec* pAcTable, IppiDecodeHuffmanState* pDecHuffState);

Parameters

pSrc	Pointer to the source buffer with the JPEG bit stream.
srcLenBytes	Length in bytes of the buffer for the bit stream.
pSrcCurrPos	Shift in bytes of the current byte in the buffer.
pDst	Pointer to the 8x8 block of the quantized DCT coefficients.
pLastDC	Pointer to the DC coefficient of the previous 8x8 block.
pMarker	Pointer to a variable that will receive JPEG marker detected during decoding.
pDcTable	Pointer to the Huffman table for the DC coefficients.
pAcTable	Pointer to the Huffman table for the AC coefficients.
pDecHuffState	Pointer to the IppiDecodeHuffmanState structure.

Description

The function ippiDecodeHuffman8x8_JPEG is declared in the ippj.h file. This function decodes an 8x8 block of the quantized DCT coefficients using pDcTable and pAcTable tables. The decoding procedure conforms to [ISO10918], Annex F.2.2, Baseline Huffman Decoding Procedures. If a JPEG marker is detected during decoding, the function stops decoding and writes the marker to a location indicated by pMarker.

Return Values

ippStsNoErr	Indicates no error.
ippStsNullPtrErr	Indicates an error condition if one of the specified pointers is NULL.
ippStsSizeErr	Indicate an error condition if srcLenBytes has a zero or negative value, or pSrcCurrPos is out of srcLenBytes limit.
ippStsJPEGDCTRangeErr	Indicates an error condition if the DCT coefficient is out of the allowed range (-1023..1023).
ippStsJPEGOutOfBufErr	Indicates an error condition if the buffer limits are exceeded.
ippStsJPEGMarkerWarn	Indicates a warning if a JPEG marker is detected.