GetHuffmanStatistics8x8_ACFirst

Computes Huffman symbols statistics for the progressive encoding (AC coefficients, the first scan).

Syntax

IppStatus ippiGetHuffmanStatistics8x8_ACFirst_JPEG_16s_C1(const Ipp16s* pSrc, int pAcStatistics[256], int Ss, int Se, int Al, IppiEncodeHuffmanState* pEncHuffState, int bFlushState);

Parameters

pSrc	Pointer to the 8x8 block of the quantized DCT coefficients.
pAcStatistics	Pointer to the Huffman symbols statistics buffer for the AC coefficients.
Ss	Spectral selection start index.
Se	Spectral selection end index.
Al	Successive approximation bit positions low, it specifies the actual point transform.
pEncHuffState	Pointer to the IppiEncodeHuffmanState structure.
bFlushState	Set to 1 for the last 8x8 block in the scan.

Description

The function ippiGetHuffmanStatistics8x8_ACFirst_JPEG is declared in the ippj.h file. This function computes the Huffman symbols statistics for an 8x8 block of the quantized DCT coefficients for progressive encoding, the first scan, AC coefficients.

Return Values

ippStsNoErr	Indicates no error.
ippStsNullPtrErr	Indicates an error condition if one or all of the specified pointers are NULL.
ippStsJPEGDCTRangeErr	Indicates an error condition if a DCT coefficient is out of the allowed range (-1023..1023).