Computes sizes of the FFT specification structure and required working buffers.
Case 1: Operation on real signal
IppStatus ippsFFTGetSize_R_16s(int order, int flag, IppHintAlgorithm hint, int* pSpecSize, int* pSpecBufferSize, int* pBufferSize);
IppStatus ippsFFTGetSize_R_32s(int order, int flag, IppHintAlgorithm hint, int* pSpecSize, int* pSpecBufferSize, int* pBufferSize);
IppStatus ippsFFTGetSize_R_32f(int order, int flag, IppHintAlgorithm hint, int* pSpecSize, int* pSpecBufferSize, int* pBufferSize);
IppStatus ippsFFTGetSize_R_64f(int order, int flag, IppHintAlgorithm hint, int* pSpecSize, int* pSpecBufferSize, int* pBufferSize);
IppStatus ippsFFTGetSize_R_16s32s(int order, int flag, IppHintAlgorithm hint, int* pSpecSize, int* pSpecBufferSize, int* pBufferSize);
Case 2: Operation on complex signal
IppStatus ippsFFTGetSize_C_16s(int order, int flag, IppHintAlgorithm hint, int* pSpecSize, int* pSpecBufferSize, int* pBufferSize);
IppStatus ippsFFTGetSize_C_32s(int order, int flag, IppHintAlgorithm hint, int* pSpecSize, int* pSpecBufferSize, int* pBufferSize);
IppStatus ippsFFTGetSize_C_32f(int order, int flag, IppHintAlgorithm hint, int* pSpecSize, int* pSpecBufferSize, int* pBufferSize);
IppStatus ippsFFTGetSize_C_64f(int order, int flag, IppHintAlgorithm hint, int* pSpecSize, int* pSpecBufferSize, int* pBufferSize);
IppStatus ippsFFTGetSize_C_16sc(int order, int flag, IppHintAlgorithm hint, int* pSpecSize, int* pSpecBufferSize, int* pBufferSize);
IppStatus ippsFFTGetSize_C_32sc(int order, int flag, IppHintAlgorithm hint, int* pSpecSize, int* pSpecBufferSize, int* pBufferSize);
IppStatus ippsFFTGetSize_C_32fc(int order, int flag, IppHintAlgorithm hint, int* pSpecSize, int* pSpecBufferSize, int* pBufferSize);
IppStatus ippsFFTGetSize_C_64fc(int order, int flag, IppHintAlgorithm hint, int* pSpecSize, int* pSpecBufferSize, int* pBufferSize);
order |
FFT order. The input signal length is N= 2order. |
flag |
Specifies the result normalization method. The values for the flag argument are described in the section Flag and Hint Arguments. |
hint |
Suggests using specific code for calculation. The values for the hint argument are described in the section Flag and Hint Arguments. |
pSpecSize |
Pointer to the FFT specification structure size value. |
pSpecBufferSize |
Pointer to the buffer size value for FFT initialization function. |
pBufferSize |
Pointer to the size value of the FFT external work buffer. |
The functions ippsFFTGetSize_R and ippsFFTGetSize_C are declared in the ipps.h file. These functions computes the size of FFT specification structure, the work buffer size for the FFT structure initialization functions ippsFFTInit_R and ippsFFTInit_C as well as the size of the FFT work buffer for the different flavors of ippsFFTFwd and ippsFFTInv. Their values in bytes are stored in pSpecSize, pSpecBufferSize, and pBufferSize respectively.
ippsFFTGetSize_R. This function is used for real flavors of the FFT functions.
ippsFFTGetSize_C. This function is used for complex flavors of the FFT functions.
ippStsNoErr |
Indicates no error. |
ippStsNullPtrErr |
Indicates an error if one of the specified pointers is NULL. |
ippStsFftOrderErr |
Indicates an error if the order value is incorrect. |
ippStsFftFlagErr |
Indicates an error if the flag value is incorrect. |
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