about huffman decoding state structure in jpeg ipp..

[Intel_C_Intel]

Hi~

We areusing the IPP 5.0 jpegsample code and IXP library in this site.

As the IPP reference manual p 971(document number,A70805-016),

"the fields of the structure of "IppiDecodeHuffmanstate" are hidden from user."

But, we would like to know the structure.

How can we know that?

[Vladimir_Dudnik]

Hi,

fields of this structure are hidden because they may be different on different architectures.

You can tract IppiDecodeHuffmanState as

typedef struct _ownpjDecodeHuffmanState
{
Ipp64u uBitBuffer;
int nBitsValid;
int nEndOfBlockRun;
.....
} ownpjDecodeHuffmanState;

Or, you can use ippiDecodeHuffman8x8_Direct_JPEG_1u16s_C1 function, which do exactly the same job but all fields which are hidden in structure are available as a parameters.

Regards,
Vladimir

[Intel_C_Intel]

Thank you for your kind explanation.

We will try to adopt your suggestion.

Have a nice day.