Visible to Intel only — GUID: GUID-1B2B2A98-279B-4A5F-BBB6-F3119273F783
Visible to Intel only — GUID: GUID-1B2B2A98-279B-4A5F-BBB6-F3119273F783
DCT8x8FwdLS
Performs a forward DCT on a 2D buffer of 8x8 size with prior data conversion and level shift.
Syntax
IppStatus ippiDCT8x8FwdLS_8u16s_C1R(const Ipp8u* pSrc, int srcStep, Ipp16s* pDst, Ipp16s addVal);
Include Files
ippi.h
Domain Dependencies
Headers: ippcore.h, ippvm.h, ipps.h
Libraries: ippcore.lib, ippvm.lib, ipps.lib
Parameters
pSrc |
Pointer to the source image buffer. |
pDst |
Pointer to the destination buffer. |
srcStep |
Distance in bytes between starts of consecutive lines in the source image buffer. |
addVal |
The level shift value. |
Description
This function operates with ROI (see Regions of Interest in Intel IPP) that is a 2D buffer of 8x8 size in this case, thus there is no need to specify its size.
This function first converts data in the buffer pSrc from unsigned Ipp8u type to the signed Ipp16s type and then performs level shift operation by adding the constant value addVal to each sample. After that, the function performs the forward discrete cosine transform of the modified data. The result is stored in pDst.
Return Values
ippStsNoErr |
Indicates no error. Any other value indicates an error or a warning. |
ippStsNullPtrErr |
Indicates an error condition if pSrc or pDst pointer is NULL. |
ippStsStepErr |
Indicates an error condition if srcStep value is zero or negative. |