Developer Reference for Intel® Integrated Performance Primitives 2019
Applies an inverse FFT to complex source data and stores results in a destination image.
Case 1: Not-in-place operation on floating-point data
IppStatus ippiFFTInv_PackToR_<mod>(const Ipp32f* pSrc, int srcStep, Ipp32f* pDst, int dstStep, const IppiFFTSpec_R_32f* pFFTSpec, Ipp8u* pBuffer);
Supported values for mod:
32f_C1R |
32f_C3R |
32f_C4R |
32f_AC4R |
Case 2: Not-in-place operation on complex data
IppStatus ippiFFTInv_CToC_32fc_C1R(const Ipp32fc* pSrc, int srcStep, Ipp32fc* pDst, int dstStep, const IppiFFTSpec_C_32fc* pFFTSpec, Ipp8u* pBuffer);
Case 3: In-place operation on floating-point data
IppStatus ippiFFTInv_PackToR_<mod>(Ipp32f* pSrcDst, int srcDstStep, const IppiFFTSpec_R_32f* pFFTSpec, Ipp8u* pBuffer);
Supported values for mod:
32f_C1IR |
32f_C3IR |
32f_C4IR |
32f_AC4IR |
Case 4: In-place operation on complex data
IppStatus ippiFFTInv_CToC_32fc_C1IR(Ipp32fc* pSrcDst, int srcDstStep, const IppiFFTSpec_C_32fc* pFFTSpec, Ipp8u* pBuffer);
ippi.h
Headers: ippcore.h, ippvm.h, ipps.h
Libraries: ippcore.lib, ippvm.lib, ipps.lib
pSrc |
Pointer to the source image ROI. |
srcStep |
Distance in bytes between starts of consecutive lines in the source image. |
pDst |
Pointer to the destination image ROI. |
dstStep |
Distance in bytes between starts of consecutive lines in the destination image. |
pSrcDst |
Pointer to the source and destination image ROI for the in-place operation. |
srcDstStep |
Distance in bytes between starts of consecutive lines in the source and destination image for the in-place operation. |
pFFTSpec |
Pointer to the previously initialized FFT context structure. |
pBuffer |
Pointer to the external work buffer. |
This function operates with ROI.
This function performs an inverse FFT on each channel of the source image pSrc (pSrcDst for in-place flavors) and writes the restored image data into the corresponding channel of the destination image buffer pDst ( pSrcDst for in-place flavors). The size of ROI is N x M, it is specified by the parameters orderX, orderY.
For the ippiFFTInv_PackToR, function flavor, the input buffer must contain data in RCPack2D format.
Before using the inverse FFT functions, you need to compute the size of the work buffer by ippiFFTGetSize and initialize the context structure by the ippiFFTInit function. The inverse FFT functions use the pFFTSpec context structure to set the mode of calculations and retrieve support data.
ippStsNoErr |
Indicates no error. Any other value indicates an error or a warning. |
ippStsNullPtrErr |
Indicates an error condition if pSrc, pDst, or pFFTSpec pointer is NULL. |
ippStsStepErr |
Indicates an error condition if srcStep or dstStep value is zero or negative. |
ippStsContextMatchErr |
Indicates an error condition if a pointer to an invalid pFFTSpec structure is passed. |
ippStsMemAllocErr |
Indicates an error condition if memory allocation fails. |