FFT

Fast Fourier Transform with an arbitrary number of samples.

void FFT(XMVECTOR* pReal, XMVECTOR* pImaginary,
        const XMVECTOR* pUnityTable,
        const size_t uLength, const size_t uCount=1);

Parameters

pReal

[in, out] Real components of the FFT. Must have as least (uLength × uCount) ÷ 4 elements.

pImaginary

[in, out] Imaginary components of the FFT. Must have at least (uLength × uCount) ÷ 4 elements.

pUnityTable

[in] Unity table the FFT should use. Must have at least uLength × uCount XVECTORs. See FFTInitializeUnityTable for more information.

uLength

[in] FFT length in samples. uLength must be a power of two and must be greater than 16.

uCount

[in] Number of FFT iterations.

Remarks

For FFTs with a number of samples less than or equal to 16 use FFT16, FFT8 or FFT4.

All buffer parameters must be 16-byte aligned. Audio data must be 32-bit float mono.

This performs a split-radix FFT, radix 4 and 2.