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 ifpSrcorpDstpointer isNULL.
- ippStsStepErr
- Indicates an error condition ifsrcStepvalue is zero or negative.